@layer app-base {
:root {
  --ink: #15172a;
  --muted: #646a7f;
  --line: #dedfeb;
  --canvas: #f5f4fa;
  --surface: #fff;
  --surface-soft: #eef0ff;
  --brand: #7c5cff;
  --brand-dark: #592dcf;
  --mint: #43d7a5;
  --sun: #f2bd50;
  --navy: #0b1122;
  --navy-soft: #131d33;
  --navy-raised: #19253f;
  --player-line: #293754;
  --player-text: #f4f6fb;
  --player-muted: #aab5ca;
  --success: #087a55;
  --error: #c43d4d;
  --warning: #a66500;
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --shadow-sm: 0 12px 30px rgba(25, 32, 51, 0.08);
  --shadow-lg: 0 30px 80px rgba(25, 32, 51, 0.14);
  --container: 1180px;
  --font-display: "Bricolage Grotesque", "Arial Narrow", sans-serif;
  --font-body: "Manrope", ui-sans-serif, system-ui, sans-serif;
  --font-utility: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  /* Premium scale: fluid type, section rhythm, motion, elevation. */
  --text-display-xl: clamp(2.75rem, 2rem + 3.8vw, 5rem);
  --text-display-lg: clamp(2.25rem, 1.75rem + 2.5vw, 3.5rem);
  --text-display-md: clamp(1.625rem, 1.4rem + 1.1vw, 2.25rem);
  --text-lead: clamp(1.0625rem, 1rem + 0.35vw, 1.25rem);
  --section-space: clamp(4rem, 2.5rem + 6vw, 8rem);
  --section-space-sm: clamp(3rem, 2rem + 4vw, 5rem);
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 160ms;
  --dur-med: 340ms;
  --dur-slow: 680ms;
  --shadow-md: 0 18px 45px rgba(25, 32, 51, 0.1);
  --ring: 0 0 0 3px color-mix(in srgb, var(--brand) 32%, transparent);
  --header-h: 76px;
}

.price-before {
  display: block;
  margin-block-end: .2em;
  font-size: .7em;
  font-weight: 500;
  letter-spacing: normal;
  white-space: nowrap;
}

.price-current {
  display: inline-block;
  font-weight: inherit;
  white-space: nowrap;
}

/* Maturalny Radar: a calm, evidence-based worksheet instead of a generic dashboard. */
  .matura-radar {
    --radar-ink: #17302e;
    --radar-muted: #59706c;
    --radar-line: #bfd4cf;
    --radar-action: #0b6b65;
    position: relative;
    min-height: 590px;
    overflow: hidden;
    padding: 27px;
    border: 1px solid rgba(203, 235, 226, .72);
    border-radius: 26px 26px 8px 26px;
    color: var(--radar-ink);
    background: #f4faf8;
    box-shadow: 28px 31px 0 rgba(4, 7, 18, .31), 0 43px 90px rgba(0, 0, 0, .34);
    transform: rotate(1.1deg);
  }

  .matura-radar > *:not(.matura-radar-grid) { position: relative; z-index: 1; }
  .matura-radar-grid {
    position: absolute;
    inset: 0;
    opacity: .38;
    background-image:
      linear-gradient(rgba(11, 107, 101, .075) 1px, transparent 1px),
      linear-gradient(90deg, rgba(11, 107, 101, .075) 1px, transparent 1px);
    background-size: 24px 24px;
    mask-image: linear-gradient(150deg, #000 0 64%, transparent 93%);
  }

  .matura-radar-header {
    min-height: 40px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
    padding-bottom: 17px;
    border-bottom: 1px solid var(--radar-line);
    color: var(--radar-action);
    font: 750 9px/1 var(--font-utility);
    letter-spacing: .12em;
  }

  .matura-radar-header > span { display: inline-flex; align-items: center; gap: 9px; }
  .matura-radar-header i {
    width: 27px;
    height: 27px;
    display: grid;
    place-items: center;
    border-radius: 8px 8px 2px 8px;
    color: #eefbf7;
    background: var(--radar-action);
    font: italic 700 15px/1 "Bitstream Charter", Georgia, serif;
  }
  .matura-radar-header small { color: #718680; font: 650 8px/1 var(--font-utility); letter-spacing: .08em; }

  .matura-radar-score { padding: 25px 0 13px; }
  .matura-radar-caption { display: block; color: var(--radar-action); font: 750 8px/1 var(--font-utility); letter-spacing: .13em; }
  .matura-radar-score strong {
    display: block;
    margin: 8px 0 3px;
    color: var(--radar-ink);
    font: 760 clamp(62px, 7.4vw, 90px)/.84 var(--font-display);
    letter-spacing: -.075em;
  }
  .matura-radar-score strong small { margin-left: 7px; color: #8aa09b; font-size: .35em; letter-spacing: -.04em; }
  .matura-radar-unit { color: var(--radar-muted); font-size: 10px; font-weight: 700; }

  .matura-radar-track { position: relative; height: 18px; margin: 7px 0 20px; border-bottom: 1px solid #98b5af; }
  .matura-radar-track::before,
  .matura-radar-track::after { content: ""; position: absolute; bottom: -4px; width: 1px; height: 8px; background: #799c94; }
  .matura-radar-track::before { left: 0; }
  .matura-radar-track::after { right: 0; }
  .matura-radar-track span { position: absolute; left: 0; bottom: -2px; width: var(--radar-progress); max-width: 100%; height: 3px; background: var(--radar-action); }
  .matura-radar-track i {
    position: absolute;
    bottom: -8px;
    width: 13px;
    height: 13px;
    border: 3px solid #f4faf8;
    border-radius: 50%;
    background: var(--radar-action);
    box-shadow: 0 0 0 1px var(--radar-action);
    transform: translateX(-50%);
  }

  .matura-radar-facts { display: grid; grid-template-columns: repeat(3, 1fr); margin: 0; border-block: 1px solid var(--radar-line); }
  .matura-radar-facts > div { padding: 13px 10px; border-right: 1px solid var(--radar-line); }
  .matura-radar-facts > div:first-child { padding-left: 0; }
  .matura-radar-facts > div:last-child { padding-right: 0; border-right: 0; }
  .matura-radar-facts dt { color: #718680; font: 650 8px/1.2 var(--font-utility); text-transform: uppercase; letter-spacing: .07em; }
  .matura-radar-facts dd { margin: 5px 0 0; color: var(--radar-ink); font-size: 12px; font-weight: 800; }

  .matura-radar-mission {
    margin: 20px -8px 0;
    padding: 19px 20px 20px;
    border-radius: 16px 16px 5px 16px;
    color: #edf7f5;
    background:
      radial-gradient(circle at 88% 8%, rgba(97, 210, 196, .18), transparent 36%),
      #153c39;
    box-shadow: 0 16px 35px rgba(13, 69, 63, .16);
  }
  .matura-radar-mission .matura-radar-caption { color: #84d9cb; }
  .matura-radar-mission h2 { margin: 10px 0 5px; color: #fff; font-size: clamp(21px, 2.4vw, 28px); letter-spacing: -.035em; line-height: 1.08; }
  .matura-radar-mission p { margin: 0 0 15px; color: #b9d0cc; font-size: 10px; line-height: 1.55; }
  .matura-radar-mission .button { min-height: 46px; width: 100%; padding-inline: 15px; color: #123d38; background: #8be0cf; box-shadow: none; }
  .matura-radar-mission .button:hover { background: #a0ebdc; transform: translateY(-1px); }

  .matura-time-presets { display: flex; align-items: center; gap: 5px; margin-top: 14px; }
  .matura-time-presets > span { margin-right: auto; color: var(--radar-muted); font-size: 9px; font-weight: 750; }
  .matura-time-presets button {
    min-height: 31px;
    padding: 0 8px;
    border: 1px solid var(--radar-line);
    border-radius: 8px 8px 3px 8px;
    color: #42605b;
    background: rgba(255, 255, 255, .72);
    cursor: pointer;
    font-size: 8px;
    font-weight: 800;
  }
  .matura-time-presets button:hover,
  .matura-time-presets button[aria-pressed="true"] { border-color: var(--radar-action); color: #fff; background: var(--radar-action); }
  .matura-radar-note { margin: 12px 0 0; color: #78908a; font-size: 8px; line-height: 1.5; }

  .compass-workbench {
    padding: var(--section-space) 0;
    color: #17302e;
    background:
      linear-gradient(rgba(11, 107, 101, .035) 1px, transparent 1px),
      linear-gradient(90deg, rgba(11, 107, 101, .035) 1px, transparent 1px),
      #eef5f3;
    background-size: 34px 34px;
  }
  .compass-workbench-shell { display: grid; gap: 39px; }
  .compass-workbench-heading { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr); align-items: end; gap: clamp(32px, 7vw, 100px); }
  .compass-workbench-heading .eyebrow { color: #0b6b65; }
  .compass-workbench-heading h2 { max-width: 760px; margin: 14px 0 0; color: #17302e; font-size: clamp(39px, 5vw, 66px); letter-spacing: -.055em; line-height: 1.02; }
  .compass-workbench-heading > p { margin: 0; color: #5e716e; font-size: 14px; line-height: 1.75; }
  .compass-workbench-grid { display: grid; grid-template-columns: 1.05fr 1.05fr .9fr; align-items: start; gap: 14px; }

  .compass-panel {
    min-width: 0;
    padding: clamp(21px, 2.4vw, 29px);
    border: 1px solid #c4d5d1;
    border-radius: 22px 22px 8px 22px;
    background: rgba(255, 255, 255, .92);
    box-shadow: 0 19px 55px rgba(26, 68, 63, .07);
  }
  .compass-panel > header { min-height: 68px; display: grid; grid-template-columns: 41px 1fr; gap: 13px; align-items: start; padding-bottom: 19px; border-bottom: 1px solid #d7e2df; }
  .compass-panel-index { width: 41px; height: 41px; display: grid; place-items: center; border-radius: 11px 11px 3px 11px; color: #e9f7f3; background: #0b6b65; font: 700 10px/1 var(--font-utility); }
  .compass-panel header small { display: block; margin: 1px 0 5px; color: #63807a; font: 700 8px/1 var(--font-utility); letter-spacing: .1em; }
  .compass-panel h3 { margin: 0; color: #17302e; font-size: clamp(20px, 2vw, 27px); letter-spacing: -.035em; line-height: 1.12; }

  .compass-focus-list,
  .compass-recovery-list { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; }
  .compass-focus-list li { display: grid; grid-template-columns: 1fr 68px; gap: 7px 15px; padding: 17px 0; border-bottom: 1px solid #dfe8e6; }
  .compass-focus-list li:last-child { border-bottom: 0; padding-bottom: 0; }
  .compass-focus-list li > div strong,
  .compass-focus-list li > div span { display: block; }
  .compass-focus-list li > div strong { color: #24423f; font-size: 12px; }
  .compass-focus-list li > div span { margin-top: 2px; color: #758783; font-size: 9px; }
  .compass-focus-list progress { width: 68px; height: 6px; align-self: center; border: 0; border-radius: 99px; overflow: hidden; background: #dce8e5; }
  .compass-focus-list progress::-webkit-progress-bar { background: #dce8e5; }
  .compass-focus-list progress::-webkit-progress-value { background: #0b6b65; }
  .compass-focus-list progress::-moz-progress-bar { background: #0b6b65; }
  .compass-focus-list li > small { grid-column: 1 / -1; color: #9a6b0a; font-size: 8px; font-weight: 750; }
  .compass-focus-list .compass-empty { display: block; }
  .compass-empty strong,
  .compass-empty span { display: block; }
  .compass-empty span { margin-top: 5px; color: #687d78; font-size: 10px; line-height: 1.55; }

  .compass-recovery-list li { min-height: 76px; display: grid; grid-template-columns: 39px 1fr; gap: 12px; align-items: start; padding: 15px 0; border-bottom: 1px solid #dfe8e6; }
  .compass-recovery-list li:last-child { border-bottom: 0; padding-bottom: 0; }
  .compass-recovery-points { width: 39px; height: 39px; display: grid; place-items: center; border-radius: 10px 10px 3px 10px; color: #684900; background: #f1d991; font: 750 11px/1 var(--font-utility); }
  .compass-recovery-list li div > small,
  .compass-recovery-list li div > strong { display: block; }
  .compass-recovery-list li div > small { color: #758783; font: 650 8px/1 var(--font-utility); }
  .compass-recovery-list li div > strong { margin-top: 5px; overflow: hidden; color: #24423f; font: italic 700 16px/1.2 "Bitstream Charter", Georgia, serif; text-overflow: ellipsis; white-space: nowrap; }
  .compass-recovery-list a { min-height: 30px; display: inline-flex; align-items: center; gap: 7px; margin-top: 4px; color: #0b6b65; font-size: 9px; font-weight: 800; text-decoration: underline; text-underline-offset: 3px; }
  .compass-recovery-list .compass-recovery-clear { grid-template-columns: 39px 1fr; align-items: center; }
  .compass-recovery-clear > span { width: 39px; height: 39px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: #0b6b65; }
  .compass-recovery-clear p { margin: 4px 0 0; color: #6b7e7a; font-size: 9px; line-height: 1.5; }

  .compass-settings-panel > p { margin: 18px 0; color: #617570; font-size: 11px; line-height: 1.65; }
  .compass-goal-settings { border-top: 1px solid #d7e2df; }
  .compass-goal-settings summary { min-height: 48px; display: flex; align-items: center; justify-content: space-between; gap: 12px; color: #0b5e59; cursor: pointer; font-size: 10px; font-weight: 800; list-style: none; }
  .compass-goal-settings summary::-webkit-details-marker { display: none; }
  .compass-goal-settings[open] summary span { transform: rotate(180deg); }
  .compass-goal-settings form { display: grid; gap: 12px; padding-top: 4px; }
  .compass-goal-settings label { display: grid; gap: 5px; color: #425b56; font-size: 9px; font-weight: 750; }
  .compass-goal-settings input,
  .compass-goal-settings select {
    width: 100%;
    min-height: 44px;
    padding: 0 11px;
    border: 1px solid #aebfbb;
    border-radius: 9px 9px 3px 9px;
    color: #17302e;
    background: #f9fcfb;
    font-size: 12px;
  }
  .compass-input-suffix { position: relative; display: block; }
  .compass-input-suffix input { padding-right: 34px; }
  .compass-input-suffix i { position: absolute; right: 13px; top: 12px; color: #64807a; font-style: normal; }
  .compass-goal-settings .errorlist { margin: 0; padding: 0; color: #9e3040; font-size: 9px; list-style: none; }
  .compass-goal-settings .button { width: 100%; min-height: 45px; margin-top: 3px; }

  .matura-radar :where(a, button):focus-visible,
  .compass-workbench :where(a, button, input, select, summary):focus-visible {
    outline: 2px solid #fff;
    outline-offset: 1px;
    box-shadow: 0 0 0 4px #0b6b65;
  }

  @media (max-width: 1040px) {
    .course-hero-grid:has(.matura-radar) { gap: 48px; }
    .matura-radar { transform: none; }
    .compass-workbench-grid { grid-template-columns: 1fr 1fr; }
    .compass-settings-panel { grid-column: 1 / -1; }
  }

  @media (max-width: 860px) {
    .matura-radar { width: min(100%, 540px); min-height: 0; }
    .compass-workbench-heading { grid-template-columns: 1fr; gap: 20px; }
    .compass-workbench-heading > p { max-width: 620px; }
  }

  @media (max-width: 640px) {
    .matura-radar { padding: 20px; box-shadow: 14px 16px 0 rgba(4, 7, 18, .27), 0 30px 70px rgba(0, 0, 0, .3); }
    .matura-radar-score strong { font-size: 67px; }
    .matura-radar-facts { grid-template-columns: 1fr 1fr; }
    .matura-radar-facts > div { padding: 11px 8px; }
    .matura-radar-facts > div:nth-child(2) { border-right: 0; }
    .matura-radar-facts > div:nth-child(3) { grid-column: 1 / -1; padding-left: 0; border-top: 1px solid var(--radar-line); }
    .matura-time-presets { flex-wrap: wrap; }
    .matura-time-presets > span { flex: 1 1 100%; }
    .matura-time-presets button { flex: 1; }
    .compass-workbench-grid { grid-template-columns: 1fr; }
    .compass-settings-panel { grid-column: auto; }
    .compass-workbench-heading h2 { font-size: 39px; }
  }

  @media (prefers-reduced-motion: no-preference) {
    .matura-radar { animation: radar-arrival 660ms 100ms cubic-bezier(.2, .72, .2, 1) both; }
    .matura-radar-track span { animation: radar-scan 800ms 420ms cubic-bezier(.2, .72, .2, 1) both; transform-origin: left; }
  }
  @keyframes radar-arrival { from { opacity: 0; transform: translateY(18px) rotate(1.1deg); } to { opacity: 1; transform: translateY(0) rotate(1.1deg); } }
  @keyframes radar-scan { from { transform: scaleX(0); } to { transform: scaleX(1); } }

  @media (prefers-reduced-motion: reduce) {
    .matura-radar,
    .matura-radar-track span { animation: none; transform: none; }
  }

/* Account protection: quiet controls with one recognizable license stamp. */
.account-security-page {
  color: #17302e;
  background: #f3f7f6;
}

.security-section {
  min-height: calc(100vh - 82px);
  padding: var(--section-space-sm) 20px 100px;
  background:
    linear-gradient(rgba(23, 48, 46, .025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 48, 46, .025) 1px, transparent 1px),
    radial-gradient(circle at 85% 6%, rgba(11, 107, 101, .10), transparent 27%);
  background-size: 30px 30px, 30px 30px, auto;
}

.security-shell { width: min(100%, 1160px); margin-inline: auto; }
.security-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr);
  align-items: end;
  gap: clamp(28px, 6vw, 76px);
  margin-bottom: 35px;
}
.security-hero h1 {
  max-width: 760px;
  margin: 13px 0 14px;
  color: #172d2d;
  font-size: clamp(42px, 6vw, 76px);
  letter-spacing: -.055em;
  line-height: .99;
}
.security-hero > div:first-child > p {
  max-width: 660px;
  margin: 0;
  color: #506563;
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.75;
}
.security-license-card {
  position: relative;
  min-height: 225px;
  display: flex;
  flex-direction: column;
  justify-content: end;
  padding: 27px;
  overflow: hidden;
  border-radius: 22px 22px 8px 22px;
  color: #eaf4f1;
  background:
    radial-gradient(circle at 76% 10%, rgba(97, 210, 196, .20), transparent 35%),
    #123b39;
  box-shadow: 0 25px 65px rgba(19, 61, 58, .18);
}
.security-license-card::after {
  content: "";
  position: absolute;
  width: 170px;
  height: 170px;
  top: -65px;
  right: -55px;
  border: 1px solid rgba(255, 255, 255, .14);
  border-radius: 50%;
  box-shadow: 0 0 0 18px rgba(255, 255, 255, .025), 0 0 0 39px rgba(255, 255, 255, .02);
}
.security-license-stamp {
  position: absolute;
  top: 24px;
  left: 26px;
  padding: 8px 10px;
  border: 1px solid rgba(178, 237, 225, .38);
  border-radius: 7px 7px 2px 7px;
  color: #b2ede1;
  font: 650 10px/1 var(--font-utility);
  letter-spacing: .08em;
}
.security-license-card strong { position: relative; z-index: 1; font-size: 16px; line-height: 1.45; }
.security-license-card p { position: relative; z-index: 1; margin: 9px 0 0; color: #b8ceca; font-size: 12px; line-height: 1.65; }

.security-messages { display: grid; gap: 8px; margin-bottom: 18px; }
.security-message {
  margin: 0;
  padding: 13px 16px;
  border: 1px solid #b9d6cf;
  border-radius: 11px;
  color: #174f42;
  background: #e4f4ee;
  font-size: 13px;
}
.security-message-error { border-color: #e5bdc3; color: #7b1e2c; background: #fbe8eb; }

.security-attention {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 27px;
  margin-bottom: 22px;
  padding: clamp(23px, 4vw, 34px);
  border: 1px solid #d7c57d;
  border-radius: 22px 22px 8px 22px;
  background: #fffaf0;
  box-shadow: 0 18px 50px rgba(87, 64, 0, .08);
}
.security-attention-mark {
  height: 96px;
  display: grid;
  place-items: center;
  border-radius: 15px 15px 4px 15px;
  color: #5a3c00;
  background: #f2df9d;
  font: 700 27px/1 var(--font-utility);
}
.security-attention h2 { margin: 7px 0 8px; font-size: clamp(25px, 4vw, 36px); letter-spacing: -.035em; }
.security-attention p { max-width: 740px; margin: 0; color: #665e52; line-height: 1.7; }
.security-replace-form,
.security-code-form { display: grid; gap: 14px; margin-top: 22px; }
.security-replace-form fieldset { display: grid; gap: 7px; margin: 0; padding: 0; border: 0; }
.security-replace-form legend,
.security-code-form > label { margin-bottom: 4px; color: #433f36; font-size: 12px; font-weight: 800; }
.security-replace-form label {
  min-height: 58px;
  display: grid;
  grid-template-columns: 20px 1fr;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: 1px solid #ddd3bd;
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
}
.security-replace-form label:has(input:checked) { border-color: #0b6b65; box-shadow: inset 3px 0 #0b6b65; }
.security-replace-form label strong,
.security-replace-form label small { display: block; }
.security-replace-form label small { margin-top: 2px; color: #6b6559; font-size: 10px; }
.security-replace-form .button { width: max-content; }
.security-code-form > div { display: flex; align-items: stretch; gap: 8px; }
.security-code-form input {
  width: min(100%, 210px);
  min-height: 52px;
  padding: 0 15px;
  border: 1px solid #9d988b;
  border-radius: 11px;
  color: #302b24;
  background: #fff;
  font: 700 22px/1 var(--font-utility);
  letter-spacing: .20em;
}
.security-code-form small { color: #665e52; }

.security-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(300px, .65fr); gap: 18px; }
.security-grid > .security-panel { align-self: start; }
.security-stack { display: grid; align-content: start; gap: 18px; }
.security-panel {
  min-width: 0;
  padding: clamp(21px, 3vw, 30px);
  border: 1px solid #c9d8d5;
  border-radius: 22px 22px 8px 22px;
  background: #fff;
  box-shadow: 0 22px 55px rgba(29, 60, 58, .08);
}
.security-panel-heading { display: flex; align-items: start; justify-content: space-between; gap: 18px; padding-bottom: 21px; border-bottom: 1px solid #dce6e4; }
.security-panel h2 { margin: 7px 0 0; color: #172d2d; font-size: clamp(24px, 3vw, 34px); letter-spacing: -.035em; }
.device-slots { display: flex; gap: 6px; padding-top: 5px; }
.device-slots i { width: 23px; height: 8px; border-radius: 99px; background: #d9e4e1; }
.device-slots i.is-used { background: #0b6b65; }
.device-list { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; }
.device-list li {
  min-height: 92px;
  display: grid;
  grid-template-columns: 43px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 15px 0;
  border-bottom: 1px solid #e0e9e7;
}
.device-icon { position: relative; width: 43px; height: 43px; border: 1px solid #bad1cc; border-radius: 11px 11px 3px 11px; background: #eaf3f1; }
.device-icon::before { content: ""; position: absolute; inset: 10px 8px 12px; border: 2px solid #0b6b65; border-radius: 2px; }
.device-icon::after { content: ""; position: absolute; width: 14px; height: 2px; left: 14px; bottom: 8px; background: #0b6b65; }
.device-icon-phone::before { inset: 7px 13px; border-radius: 4px; }
.device-icon-phone::after { width: 3px; height: 3px; left: 20px; bottom: 9px; border-radius: 50%; }
.device-icon-tablet::before { inset: 6px 10px; border-radius: 4px; }
.device-list li > div > strong,
.device-list li > div > small { display: block; }
.device-list li > div > strong { color: #172d2d; font-size: 14px; }
.device-list li > div > small { margin-top: 4px; color: #61736f; font-size: 10px; line-height: 1.5; }
.current-device { display: inline-flex; margin-top: 7px; padding: 4px 7px; border-radius: 6px; color: #0b5b55; background: #ddf1eb; font-size: 9px; font-weight: 800; text-transform: uppercase; letter-spacing: .04em; }
.device-list form button,
.security-panel-action button { min-height: 38px; padding: 0 10px; border: 1px solid #b8cbc7; border-radius: 9px; color: #39524f; background: transparent; cursor: pointer; font-size: 10px; font-weight: 750; }
.device-list form button:hover,
.security-panel-action button:hover { border-color: #9e3040; color: #842638; background: #fbedef; }
.security-panel-action { padding-top: 18px; }
.security-empty { grid-template-columns: 1fr !important; color: #61736f; line-height: 1.6; }
.playback-panel > p { margin: 13px 0 20px; color: #5b6f6b; font-size: 13px; line-height: 1.65; }
.security-rules ul { display: grid; gap: 14px; margin: 21px 0 0; padding: 0; list-style: none; }
.security-rules li { display: grid; grid-template-columns: 43px 1fr; gap: 12px; align-items: start; }
.security-rules li > span { min-height: 38px; display: grid; place-items: center; border-radius: 10px 10px 3px 10px; color: #0b5b55; background: #ddf0ec; font: 700 12px/1 var(--font-utility); }
.security-rules p { margin: 0; }
.security-rules strong,
.security-rules small { display: block; }
.security-rules strong { color: #203836; font-size: 12px; }
.security-rules small { margin-top: 3px; color: #61736f; font-size: 10px; line-height: 1.5; }

.account-security-page :where(a, button, input):focus-visible {
  outline: 2px solid #fff !important;
  outline-offset: 0 !important;
  box-shadow: 0 0 0 4px #172d2d !important;
}

/* Protected video remains a calm dark island inside every reading theme. */
.video-frame mux-player {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  display: block;
  background: #050914;
  --pip-button: none;
  --airplay-button: none;
  --cast-button: none;
  --fullscreen-button: none;
  --controls-backdrop-color: rgba(2, 6, 16, .68);
}
.video-frame.is-protected .video-frame-meta { z-index: 4; }
.video-license-watermark {
  position: absolute;
  z-index: 6;
  max-width: calc(100% - 34px);
  padding: 7px 9px;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 7px 7px 2px 7px;
  color: rgba(255, 255, 255, .78);
  background: rgba(5, 9, 20, .34);
  backdrop-filter: blur(4px);
  pointer-events: none;
  user-select: none;
  font: 600 clamp(8px, 1.2vw, 10px)/1 var(--font-utility);
  letter-spacing: .055em;
  text-shadow: 0 1px 2px #000;
  transition: top 240ms ease, right 240ms ease, bottom 240ms ease, left 240ms ease, opacity 180ms ease;
}
.video-license-watermark[hidden] { display: none; }
.video-license-watermark.is-position-0 { top: 17%; left: 4%; }
.video-license-watermark.is-position-1 { top: 18%; right: 4%; }
.video-license-watermark.is-position-2 { top: 46%; left: 7%; }
.video-license-watermark.is-position-3 { top: 43%; right: 6%; }
.video-license-watermark.is-position-4 { bottom: 19%; left: 14%; }
.video-license-watermark.is-position-5 { bottom: 20%; right: 13%; }

.protected-video-bar {
  min-height: 54px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 13px;
  border-top: 1px solid var(--studio-line, #c9d8d5);
  background: var(--studio-surface-muted, #e5efed);
}
.protected-video-bar > span { display: inline-grid; place-items: center; width: 30px; height: 30px; border: 1px solid var(--studio-control-line, #607a77); border-radius: 9px 9px 3px 9px; color: var(--studio-muted, #506563); background: var(--studio-surface, #fff); cursor: help; font-size: 13px; }
.protected-video-bar > span i { color: var(--studio-action, #0b6b65); font-style: normal; }
.protected-video-bar > button { min-height: 38px; margin-left: auto; padding: 0 11px; border: 1px solid var(--studio-control-line, #607a77); border-radius: 9px; color: var(--studio-text, #172d2d); background: var(--studio-surface, #fff); cursor: pointer; font-size: 10px; font-weight: 750; }
.protected-video-bar [data-playback-status] { flex: 1 1 100%; margin: 0; color: var(--studio-muted, #506563); font-size: 11px; }
.protected-video-bar [data-playback-status][data-kind="warning"] { color: var(--studio-warning-text, #5a3c00); }
.protected-video-bar [data-playback-status][data-kind="error"] { color: var(--studio-error-text, #7b1e2c); }
.protected-video-bar [data-playback-status]:not([hidden]) ~ span { display: none; }

.playback-dialog {
  width: min(92vw, 540px);
  max-width: none;
  margin: auto;
  padding: 0;
  overflow: visible;
  border: 0;
  border-radius: 20px 20px 7px 20px;
  color: #172d2d;
  background: transparent;
  box-shadow: 0 34px 95px rgba(0, 0, 0, .38);
}
.playback-dialog::backdrop { background: rgba(2, 8, 16, .76); backdrop-filter: blur(6px); }
.playback-dialog-card { position: relative; padding: 31px; overflow: hidden; border: 1px solid #bdd2ce; border-radius: inherit; background: #f9fcfb; }
.playback-dialog-card::before { content: ""; position: absolute; width: 150px; height: 150px; top: -83px; right: -58px; border: 22px solid rgba(11, 107, 101, .08); border-radius: 50%; }
.playback-dialog-mark { width: 48px; height: 48px; display: grid; place-items: center; margin-bottom: 20px; border-radius: 13px 13px 4px 13px; color: #fff; background: #0b6b65; font-size: 21px; }
.playback-dialog h2 { margin: 8px 0 9px; color: #172d2d; font-size: clamp(25px, 4vw, 34px); letter-spacing: -.04em; line-height: 1.08; }
.playback-dialog p { margin: 0; color: #526663; font-size: 13px; line-height: 1.7; }
.playback-dialog-error { margin-top: 11px !important; color: #7b1e2c !important; }
.playback-dialog-actions { display: flex; align-items: center; gap: 8px; margin-top: 23px; }
.playback-dialog-actions .button { min-height: 48px; }
.playback-dialog [hidden] { display: none !important; }
.playback-dialog-card > a { min-height: 38px; display: inline-flex; align-items: center; gap: 6px; margin-top: 13px; color: #0b5b55; font-size: 11px; font-weight: 800; text-decoration: underline; text-underline-offset: 3px; }
.playback-dialog-open .mobile-lesson-action { opacity: 0 !important; pointer-events: none !important; transform: translateY(110%) !important; }

.outline-security {
  min-height: 43px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 22px;
  border-top: 1px solid var(--studio-line, #c9d8d5);
  color: var(--studio-action, #0b6b65);
  font-size: 10px;
  font-weight: 750;
}
.outline-security:hover { color: var(--studio-action-hover, #07504d); }
.resource-panel li .resource-locked {
  min-height: 56px;
  display: grid;
  grid-template-columns: 25px 1fr;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px dashed var(--studio-control-line, #607a77);
  border-radius: 9px 9px 3px 9px;
  color: var(--studio-muted, #506563);
  background: var(--studio-surface-muted, #e5efed);
}
.resource-locked strong,
.resource-locked small { display: block; }
.resource-locked strong { font-size: 13px; }
.resource-locked small { margin-top: 2px; font: 500 10px var(--font-utility); text-transform: uppercase; }
.resource-locked a { color: var(--studio-action, #0b6b65); text-decoration: underline; }
.video-frame:fullscreen mux-player { width: 100%; height: 100%; }

@media (max-width: 820px) {
  .security-hero,
  .security-grid { grid-template-columns: 1fr; }
  .security-license-card { min-height: 195px; }
}

@media (max-width: 640px) {
  .account-security-link { display: none; }
  .security-section { padding: 38px 13px 72px; }
  .security-hero { gap: 24px; margin-bottom: 24px; }
  .security-hero h1 { font-size: clamp(39px, 13vw, 56px); }
  .security-license-card { min-height: 180px; padding: 23px; }
  .security-attention { grid-template-columns: 1fr; gap: 17px; }
  .security-attention-mark { width: 75px; height: 67px; }
  .security-replace-form .button,
  .security-code-form > div,
  .security-code-form .button,
  .security-code-form input { width: 100%; }
  .security-code-form > div { align-items: stretch; flex-direction: column; }
  .security-panel { padding: 20px 17px; }
  .device-list li { grid-template-columns: 39px minmax(0, 1fr); }
  .device-list li > form { grid-column: 2; }
  .device-icon { width: 39px; height: 39px; }
  .device-icon::after { left: 12px; }
  .device-icon-phone::after { left: 18px; }

  .protected-video-bar { flex-wrap: wrap; }
  .protected-video-bar > button { min-height: 42px; }
  .video-license-watermark { max-width: calc(100% - 18px); padding: 6px 7px; font-size: 7px; }
  .video-license-watermark.is-position-0,
  .video-license-watermark.is-position-2 { left: 3%; }
  .video-license-watermark.is-position-1,
  .video-license-watermark.is-position-3 { right: 3%; }
  .playback-dialog {
    width: 100vw;
    max-height: calc(100vh - env(safe-area-inset-top));
    margin: auto 0 0;
    border-radius: 22px 22px 0 0;
  }
  .playback-dialog-card { max-height: inherit; padding: 26px 20px calc(22px + env(safe-area-inset-bottom)); overflow-y: auto; }
  .playback-dialog-actions { align-items: stretch; flex-direction: column; }
  .playback-dialog-actions .button { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  .video-license-watermark { transition: none; }
}
}

/* Personal workshop signature: a real solution artifact and a presentation-grade player. */
  .course-workbook {
    isolation: isolate;
    align-items: stretch;
    gap: 20px;
    padding: 32px;
    background:
      radial-gradient(circle at 78% 18%, rgba(67, 220, 168, .16), transparent 25%),
      linear-gradient(150deg, #6d4aff, #23184e 78%);
  }

  .course-workbook::after { display: none; }

  .workbook-paper {
    position: relative;
    z-index: 2;
    min-height: 350px;
    display: flex;
    flex-direction: column;
    padding: 30px 31px 26px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,.8);
    border-radius: 7px 19px 9px 7px;
    color: #17182b;
    background:
      linear-gradient(rgba(93, 76, 166, .07) 1px, transparent 1px),
      #fff;
    background-size: 100% 31px;
    box-shadow: 0 28px 65px rgba(4, 7, 18, .34);
    transform: rotate(-2.5deg);
  }

  .workbook-paper::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 23px;
    width: 1px;
    background: rgba(239, 91, 118, .22);
  }

  .workbook-label {
    position: relative;
    color: #5c3bd2;
    font: 650 11px/1.3 var(--font-utility);
    letter-spacing: .08em;
  }

  .workbook-paper > small {
    position: relative;
    margin-top: 25px;
    color: #6a6c7e;
    font-size: 12px;
    font-weight: 700;
  }

  .workbook-equation {
    position: relative;
    margin-top: 8px;
    color: #17182b;
    font: 600 clamp(25px, 3vw, 34px)/1.2 "Bitstream Charter", Georgia, serif;
    letter-spacing: -.025em;
  }

  .workbook-paper ol {
    position: relative;
    display: grid;
    gap: 3px;
    margin: 24px 0 0;
    padding: 0;
    list-style: none;
  }

  .workbook-paper li {
    min-height: 42px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding-inline: 10px;
    border-radius: 8px;
    font: 600 18px/1.3 "Bitstream Charter", Georgia, serif;
  }

  .workbook-paper li small {
    color: #8b8d9c;
    font: 600 11px/1.3 var(--font-utility);
  }

  .workbook-paper li.is-result {
    width: max-content;
    min-width: 205px;
    margin-top: 3px;
    color: #123e31;
    background: #dff9ef;
  }

  .workbook-paper li.is-result small { color: #187253; }

  .workbook-correction {
    position: absolute;
    width: 235px;
    height: 72px;
    right: -25px;
    bottom: 20px;
    border-bottom: 4px solid #43dca8;
    border-radius: 50%;
    transform: rotate(-8deg);
  }

  .cover-player-chip {
    position: relative;
    z-index: 2;
    min-height: 42px;
    display: inline-flex;
    align-items: center;
    align-self: flex-end;
    gap: 9px;
    padding: 0 13px;
    border: 1px solid rgba(255,255,255,.19);
    border-radius: 11px 11px 4px 11px;
    color: #edf0fb;
    background: rgba(8, 10, 27, .34);
    backdrop-filter: blur(12px);
    font: 650 11px/1 var(--font-utility);
  }

  .cover-player-chip i { color: var(--mint); font-style: normal; }

  .course-library {
    isolation: isolate;
    gap: 24px;
    padding: 34px;
    background:
      radial-gradient(circle at 82% 14%, rgba(67, 220, 168, .23), transparent 27%),
      linear-gradient(150deg, #7547ef 0%, #332170 48%, #151c35 100%);
  }

  .course-library::after {
    left: -115px;
    top: 40%;
    width: 570px;
    height: 255px;
    opacity: .35;
  }

  .course-library > * { position: relative; z-index: 2; }

  .course-library-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
  }

  .course-library-status {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    color: #dff9ef;
    font: 700 9px/1 var(--font-utility);
    letter-spacing: .11em;
  }

  .course-library-status i {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--mint);
    box-shadow: 0 0 0 5px rgba(67, 220, 168, .12);
  }

  .course-library-lead {
    display: grid;
    justify-items: start;
    align-content: center;
    min-height: 205px;
  }

  .course-library-lead small {
    color: #c7baff;
    font: 700 10px/1.2 var(--font-utility);
    letter-spacing: .14em;
  }

  .course-library-lead b {
    color: #fff;
    font: 650 clamp(84px, 9vw, 118px)/.86 "Bitstream Charter", Georgia, serif;
    letter-spacing: -.07em;
  }

  .course-library-lead span {
    margin-top: 12px;
    color: #f3f0ff;
    font-size: 19px;
    font-weight: 720;
  }

  .course-library-facts {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    margin: 0;
    border: 1px solid rgba(255,255,255,.17);
    border-radius: 14px;
    background: rgba(6, 10, 27, .27);
    backdrop-filter: blur(8px);
  }

  .course-library-facts div {
    padding: 15px 13px;
    border-left: 1px solid rgba(255,255,255,.13);
  }

  .course-library-facts div:first-child { border-left: 0; }
  .course-library-facts dt { color: #fff; font-size: 22px; font-weight: 850; }
  .course-library-facts dd { margin: 3px 0 0; color: #c6cce0; font-size: 11px; }

  .course-library-preview {
    min-height: 60px;
    display: grid;
    grid-template-columns: 38px 1fr auto;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border: 1px solid rgba(255,255,255,.18);
    border-radius: 14px;
    color: #fff;
    background: rgba(7, 11, 28, .55);
  }

  .course-library-preview > span:first-child {
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border-radius: 11px;
    color: #123e31;
    background: var(--mint);
  }

  .course-library-preview strong,
  .course-library-preview small { display: block; }
  .course-library-preview strong { font-size: 13px; }
  .course-library-preview small { margin-top: 3px; color: #aeb9cf; font-size: 10px; }
  .course-library-preview > i { color: var(--mint); font-style: normal; }
  .course-library-preview:hover { border-color: rgba(67, 220, 168, .55); }

  .lesson-youtube iframe { display: block; width: 100%; min-height: 200px; aspect-ratio: 16 / 9; border: 0; }
  .lesson-youtube > p { margin: 0; padding: 16px; color: var(--player-text, #fff); }
  .video-studio {
    overflow: visible;
    border-color: #354666;
    background: #0e182d;
    box-shadow: 0 34px 90px rgba(0, 0, 0, .34), 0 0 0 1px rgba(154, 133, 255, .06);
  }

  .video-frame {
    overflow: hidden;
    border-radius: 18px;
    background:
      radial-gradient(circle at 50% 42%, rgba(109,74,255,.18), transparent 40%),
      #050914;
  }

  .video-frame video { position: relative; z-index: 1; }

  .video-frame-meta {
    position: absolute;
    z-index: 3;
    top: 15px;
    left: 15px;
    right: 15px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    pointer-events: none;
    transition: opacity 180ms ease, transform 180ms ease;
  }

  .video-frame-meta span {
    min-height: 32px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0 10px;
    border: 1px solid rgba(255,255,255,.16);
    border-radius: 9px 9px 3px 9px;
    color: #f2f4fb;
    background: rgba(7, 11, 25, .68);
    backdrop-filter: blur(12px);
    font: 650 11px/1 var(--font-utility);
    letter-spacing: .06em;
  }

  .video-frame-meta i {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--mint);
    box-shadow: 0 0 0 4px rgba(67, 220, 168, .13);
  }

  .video-stage-play {
    position: absolute;
    /* The transport overlay sits above the video at z-index 5. Keep the
       primary start action above it until playback begins so the visibly
       offered button always receives the first pointer/touch interaction. */
    z-index: 6;
    left: 50%;
    top: 50%;
    display: grid;
    grid-template-columns: 58px auto;
    grid-template-rows: auto auto;
    column-gap: 14px;
    padding: 12px 17px 12px 12px;
    border: 1px solid rgba(255,255,255,.2);
    border-radius: 18px 18px 6px 18px;
    color: #fff;
    background: rgba(8, 13, 29, .84);
    box-shadow: 0 18px 55px rgba(0,0,0,.34);
    backdrop-filter: blur(18px);
    cursor: pointer;
    transform: translate(-50%, -50%);
    transition: opacity 160ms ease, transform 160ms ease;
  }

  .video-stage-play:hover { transform: translate(-50%, -52%); }
  .video-stage-play > span {
    grid-row: 1 / 3;
    width: 58px;
    height: 58px;
    display: grid;
    place-items: center;
    padding-left: 3px;
    border-radius: 14px 14px 5px 14px;
    color: #17182b;
    background: var(--mint);
    box-shadow: 0 12px 30px rgba(67,220,168,.24);
  }
  .video-stage-play strong { align-self: end; font: 750 14px/1.2 var(--font-display); }
  .video-stage-play small { align-self: start; margin-top: 4px; color: #aeb9ca; font-size: 11px; white-space: nowrap; }
  .video-load-error {
    position: absolute;
    z-index: 7;
    left: 50%;
    top: 50%;
    width: min(calc(100% - 32px), 560px);
    margin: 0;
    padding: 13px 15px;
    border: 1px solid rgba(243,127,141,.42);
    border-radius: 11px;
    color: #ffe2e7;
    background: rgba(68, 14, 27, .9);
    text-align: center;
    font-size: 12px;
    transform: translate(-50%, -50%);
  }
  .video-load-error:not([hidden]) { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 10px 14px; }
  .video-load-error button { min-height: 40px; padding: 0 14px; border: 1px solid rgba(255,255,255,.46); border-radius: 9px 9px 3px 9px; color: #fff; background: rgba(255,255,255,.1); cursor: pointer; font: 750 11px/1 var(--font-body); }
  .video-load-error button:hover { border-color: var(--mint); background: rgba(67,220,168,.12); }
  .video-load-error button:focus-visible { outline: 3px solid var(--focus-ring); outline-offset: 3px; }
  .video-load-error button:disabled { cursor: wait; opacity: .68; }
  .video-load-error[hidden] { display: none; }
  .video-frame.has-media-error .video-stage-play { display: none; }
  .video-frame.has-started:not(.has-ended) .video-stage-play,
  .video-frame.has-started:not(.has-ended) .video-frame-meta { opacity: 0; pointer-events: none; transform: translate(-50%, -46%); }
  .video-frame.has-started:not(.has-ended) .video-frame-meta { transform: translateY(-8px); }

  .video-convenience {
    min-height: 0;
    display: grid;
    gap: 9px;
    padding: 13px 15px 14px;
  }

  .video-overlay {
    position: absolute;
    z-index: 5;
    left: 0;
    right: 0;
    bottom: 0;
    gap: 8px;
    padding: 36px 16px 12px;
    border-top: 0;
    transition: opacity 200ms ease;
  }
  .video-frame.is-idle .video-overlay { opacity: 0; pointer-events: none; }
  .video-frame.is-idle { cursor: none; }
  .video-overlay [data-video-volume] { width: 76px; accent-color: var(--mint); cursor: pointer; }

  .video-caption-strip {
    min-height: 64px;
    display: grid;
    place-items: center;
    padding: 11px 18px 13px;
    border-top: 1px solid #293956;
    color: #f5f8ff;
    background: #0b1427;
    text-align: center;
    white-space: pre-line;
    font: 700 clamp(14px, 1.55vw, 17px)/1.42 var(--font-body);
  }
  .video-caption-strip:empty::before { content: "Napisy włączone"; color: #71819c; font: 650 10px/1 var(--font-utility); letter-spacing: .08em; text-transform: uppercase; }
  .video-caption-strip[hidden] { display: none; }

  .video-studio:fullscreen {
    width: 100vw;
    height: 100vh;
    display: grid;
    grid-template-rows: minmax(0, 1fr) auto;
    border: 0;
    border-radius: 0;
    background: #050914;
  }
  .video-studio:fullscreen > :not(.video-frame):not(.video-caption-strip):not(.protected-video-bar) { display: none; }
  .video-studio:fullscreen .video-frame { width: 100%; height: 100%; min-height: 0; aspect-ratio: auto; border-radius: 0; }
  .video-studio:fullscreen .video-caption-strip { min-height: 70px; }

  .video-spinner {
    position: absolute;
    z-index: 4;
    left: 50%;
    top: 50%;
    width: 46px;
    height: 46px;
    margin: -23px 0 0 -23px;
    border: 4px solid rgba(255, 255, 255, .22);
    border-top-color: var(--mint);
    border-radius: 50%;
    animation: video-spin 800ms linear infinite;
  }
  .video-spinner[hidden] { display: none; }
  @keyframes video-spin { to { transform: rotate(360deg); } }

  .quick-note { border-top: 0; background: #0e182d; }
  .quick-note > summary { min-height: 48px; display: flex; align-items: center; gap: 9px; padding: 0 16px; color: #aebad0; cursor: pointer; font-size: 12px; font-weight: 700; list-style: none; }
  .quick-note > summary::-webkit-details-marker { display: none; }
  .quick-note > summary:hover { color: #fff; }
  .quick-note-icon { color: var(--mint); }
  .quick-note-time { margin-left: auto; color: var(--mint); font: 600 11px var(--font-utility); }
  .quick-note-caret { color: #7f8da3; font-size: 13px; transition: transform 160ms ease; }
  .quick-note[open] .quick-note-caret { transform: rotate(180deg); }
  .quick-note form { display: grid; gap: 10px; padding: 2px 16px 14px; }
  .quick-note textarea { width: 100%; resize: vertical; min-height: 74px; padding: 12px 13px; border: 1px solid #3a4965; border-radius: 10px; color: #edf1f7; background: #0d172a; font: 14px/1.6 var(--font-body); }
  .quick-note textarea:focus { border-color: #8e7aeb; outline: 3px solid rgba(143, 122, 255, .16); }
  .quick-note-actions { display: grid; grid-template-columns: minmax(0, 1fr) auto; grid-template-rows: 18px auto; align-items: center; gap: 2px 12px; }
  .quick-note-actions small { grid-column: 1; grid-row: 2; color: #8491a7; font-size: 11px; }
  .quick-note-actions .button { grid-column: 2; grid-row: 2; min-height: 40px; padding-inline: 14px; font-size: 11px; }
  .quick-note-actions [data-form-status] { grid-column: 2; grid-row: 1; min-height: 18px; justify-self: end; color: #9be8cd; font-size: 11px; font-weight: 700; line-height: 1.35; text-align: right; }
  .quick-note-actions [data-form-status]:empty { visibility: hidden; }

  .video-timeline-track { position: relative; display: grid; align-items: center; }
  .video-timeline-markers { position: absolute; inset: 0; pointer-events: none; }
  .video-timeline-markers i {
    position: absolute;
    top: 50%;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: rgba(255, 255, 255, .9);
    box-shadow: 0 0 0 2px rgba(4, 8, 18, .5);
    transform: translate(-50%, -50%);
  }

  .video-timeline {
    display: grid;
    grid-template-columns: minmax(120px, 1fr) auto;
    align-items: center;
    gap: 13px;
  }

  .video-timeline input {
    width: 100%;
    height: 18px;
    margin: 0;
    appearance: none;
    background: transparent;
    cursor: pointer;
  }

  .video-timeline input::-webkit-slider-runnable-track {
    height: 5px;
    border-radius: 99px;
    background: linear-gradient(90deg, var(--mint) var(--video-progress, 0%), #35435c var(--video-progress, 0%));
  }

  .video-timeline input::-moz-range-track { height: 5px; border-radius: 99px; background: #35435c; }
  .video-timeline input::-moz-range-progress { height: 5px; border-radius: 99px; background: var(--mint); }
  .video-timeline input::-webkit-slider-thumb { width: 15px; height: 15px; margin-top: -5px; appearance: none; border: 3px solid #101a2f; border-radius: 50%; background: #fff; box-shadow: 0 0 0 2px var(--mint); }
  .video-timeline input::-moz-range-thumb { width: 11px; height: 11px; border: 3px solid #101a2f; border-radius: 50%; background: #fff; box-shadow: 0 0 0 2px var(--mint); }
  .video-timeline span { min-width: 84px; color: #9eabc0; text-align: right; font: 600 11px/1 var(--font-utility); }

  .video-control-row { display: flex; align-items: center; flex-wrap: wrap; gap: 7px; }
  .video-control-row label { margin-left: auto; }
  .video-convenience button,
  .video-convenience select,
  .video-shortcuts summary { min-height: 44px; padding-inline: 12px; font-size: 11px; }
  .video-convenience button.is-active { border-color: rgba(67,220,168,.48); color: #c8f6e5; background: rgba(67,220,168,.09); }
  .video-chapters button { min-height: 44px; font-size: 11px; }
  .video-chapters button > span { font-size: 11px; }
  .video-chapters button.is-active { border-color: rgba(67,220,168,.44); color: #fff; background: #19372f; box-shadow: inset 3px 0 0 var(--mint); }
  .video-chapters > summary,
  .transcript-panel > summary small,
  .resource-panel-heading small,
  .resource-panel li small { font-size: 11px; }
  .transcript-body { font-size: 15px; line-height: 1.78; }

  .video-frame:fullscreen { width: 100vw; height: 100vh; aspect-ratio: auto; border-radius: 0; background: #000; }
  .video-frame:fullscreen video { width: 100%; height: 100%; }

  @media (max-width: 640px) {
    .course-workbook { min-height: 420px; padding: 22px; }
    .workbook-paper { min-height: 300px; padding: 24px 22px 21px; }
    .workbook-paper li { font-size: 16px; }
    .cover-player-chip { align-self: stretch; justify-content: center; }
    .video-frame-meta { top: 9px; left: 9px; right: 9px; }
    .video-frame-meta span { min-height: 28px; padding-inline: 8px; font-size: 9px; }
    .video-frame-meta span:first-child { max-width: 72%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    .video-stage-play { grid-template-columns: 46px auto; column-gap: 10px; padding: 9px 12px 9px 9px; }
    .video-stage-play > span { width: 46px; height: 46px; }
    .video-stage-play strong { font-size: 12px; }
    .video-stage-play small { display: none; }
    .video-convenience { padding-inline: 10px; }
    .video-overlay { padding: 26px 10px 10px; }
    .video-overlay [data-video-volume] { display: none; }
    .video-control-row {
      display: flex;
      flex-wrap: nowrap;
      gap: 6px;
      overflow-x: auto;
      padding-bottom: 2px;
      scrollbar-width: none;
    }
    .video-control-row::-webkit-scrollbar { display: none; }
    .video-control-row > button,
    .video-control-row > details,
    .video-control-row > label { flex: 0 0 auto; min-width: 0; width: auto; }
    .video-control-row > label { justify-content: center; margin-left: 0; }
    .video-control-row > details summary { justify-content: center; }
    .video-control-row [data-video-fullscreen],
    .video-control-row [data-video-pip] { font-size: 0; }
    .video-control-row [data-video-fullscreen]::after { content: "Pełny"; font-size: 11px; }
    .video-control-row [data-video-pip]::after { content: "Mini"; font-size: 11px; }
    .mobile-lesson-action { transition: transform 180ms ease, opacity 180ms ease; }
    .video-in-view .mobile-lesson-action { opacity: 0; pointer-events: none; transform: translateY(110%); }
  }

  @media (max-width: 380px) {
    .video-convenience [data-transcript-toggle] { display: inline-flex; }
  }

  @media (prefers-reduced-motion: no-preference) {
    .workbook-correction { animation: correction-draw 850ms cubic-bezier(.2,.7,.2,1) 380ms both; }
  }

  @keyframes correction-draw {
    from { clip-path: inset(0 100% 0 0); }
    to { clip-path: inset(0); }
  }

@layer app-premium {
  .utility-label,
  .eyebrow,
  .mini-label,
  .course-meta,
  .cover-kicker,
  .exercise-topline,
  .lesson-mode {
    font-family: var(--font-utility);
  }

  .brand {
    font-family: var(--font-display);
    font-weight: 760;
    letter-spacing: -.045em;
  }

  .brand-mark {
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, .5);
    border-radius: 13px 13px 5px 13px;
    color: #fff;
    background: linear-gradient(145deg, #7949ff, #5228c2);
    font-family: "Bitstream Charter", Georgia, serif;
    font-style: italic;
    box-shadow: 0 10px 24px rgba(90, 45, 207, .22);
  }

  .brand-mark::after {
    content: "";
    position: absolute;
    width: 40px;
    height: 16px;
    left: -6px;
    bottom: -8px;
    border: 2px solid var(--mint);
    border-radius: 50%;
    transform: rotate(-12deg);
  }

  .main-nav a { font-size: 13px; font-weight: 720; }

  .button {
    border-radius: 13px;
    font-weight: 780;
    letter-spacing: -.015em;
  }

  .button-primary {
    background: linear-gradient(135deg, color-mix(in srgb, var(--brand) 90%, #fff), color-mix(in srgb, var(--brand) 82%, #32117f));
    box-shadow: 0 13px 30px color-mix(in srgb, var(--brand) 25%, transparent), inset 0 1px 0 rgba(255,255,255,.2);
  }

  .button-primary:hover { box-shadow: 0 17px 38px color-mix(in srgb, var(--brand) 31%, transparent); }

  /* Login — a focused proof sheet, not a generic centered form. */
  .auth-section {
    min-height: calc(100vh - 80px);
    display: block;
    padding: 30px;
    background:
      radial-gradient(circle at 77% 18%, color-mix(in srgb, var(--brand) 10%, transparent), transparent 30%),
      #f3f2f8;
  }

  .auth-shell {
    width: min(100%, 1180px);
    min-height: min(720px, calc(100vh - 140px));
    display: grid;
    grid-template-columns: 1.05fr .95fr;
    grid-template-areas: "story form";
    margin-inline: auto;
    overflow: hidden;
    border: 1px solid #d9d9e7;
    border-radius: 30px;
    background: #fff;
    box-shadow: 0 38px 100px rgba(26, 23, 55, .14);
  }

  .auth-story {
    grid-area: story;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: end;
    padding: 58px;
    color: #fff;
    background: #11152a;
  }

  .auth-story::before {
    content: "";
    position: absolute;
    width: 720px;
    height: 270px;
    left: -145px;
    top: 28%;
    border: 4px solid var(--mint);
    border-radius: 50%;
    opacity: .78;
    transform: rotate(-12deg);
  }

  .auth-story::after {
    content: "f(x)";
    position: absolute;
    top: 56px;
    right: 50px;
    color: rgba(255, 255, 255, .11);
    font-family: "Bitstream Charter", Georgia, serif;
    font-size: 128px;
    font-style: italic;
  }

  .auth-story-grid,
  .course-hero-gridlines {
    position: absolute;
    inset: 0;
    opacity: .16;
    background-image: linear-gradient(rgba(255,255,255,.28) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.28) 1px, transparent 1px);
    background-size: 38px 38px;
    mask-image: linear-gradient(145deg, #000, transparent 74%);
  }

  .auth-story-content { position: relative; z-index: 2; max-width: 510px; }
  .utility-label { color: #8df0cc; font-size: 10px; font-weight: 600; letter-spacing: .15em; }
  .auth-story p.auth-story-title { max-width: 500px; margin: 16px 0 18px; color: #fff; font-family: var(--font-display); font-size: clamp(40px, 4.4vw, 62px); font-weight: 760; letter-spacing: -.045em; line-height: 1.06; }
  .auth-story p { max-width: 480px; margin: 0; color: #b8c1d2; line-height: 1.75; }

  .auth-equation {
    width: max-content;
    margin-top: 38px;
    padding: 12px 17px;
    border: 1px solid rgba(255,255,255,.16);
    border-radius: 12px;
    color: #fff;
    background: rgba(5, 8, 21, .54);
    font-family: "Bitstream Charter", Georgia, serif;
    font-size: 22px;
    font-style: italic;
    backdrop-filter: blur(8px);
  }

  .auth-rhythm {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
    margin: 38px 0 0;
    padding: 0;
    border-top: 1px solid rgba(255,255,255,.14);
    list-style: none;
  }

  .auth-rhythm li { padding: 18px 14px 0 0; }
  .auth-rhythm li:not(:last-child) { border-right: 1px solid rgba(255,255,255,.12); }
  .auth-rhythm span, .auth-rhythm strong { display: block; }
  .auth-rhythm span { color: #8177a5; font-family: var(--font-utility); font-size: 9px; }
  .auth-rhythm strong { margin-top: 4px; color: #eef1f8; font-size: 11px; }

  .auth-card-wrap { grid-area: form; display: grid; place-items: center; padding: 48px; }
  .auth-card { width: min(100%, 430px); padding: 0; border: 0; border-radius: 0; box-shadow: none; }
  .auth-mark { border-radius: 15px 15px 5px 15px; font-family: "Bitstream Charter", Georgia, serif; font-style: italic; }
  .auth-card h1 { margin: 15px 0 9px; font-size: 45px; }
  .auth-card > p { line-height: 1.7; }
  .auth-form { margin-top: 25px; }
  .auth-form label { font-size: 12px; }
  .auth-form input { min-height: 56px; border-radius: 12px; background: #fafafe; }
  .auth-form input:hover { border-color: #b9b8ca; }

  .auth-demo-note {
    display: flex;
    align-items: start;
    gap: 10px;
    margin: 18px 0 0;
    padding-top: 18px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 11px;
  }

  .auth-demo-note > span {
    flex: 0 0 auto;
    width: 21px;
    height: 21px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    color: var(--brand-dark);
    background: #eeeafd;
    font-family: var(--font-utility);
    font-size: 10px;
  }

  /* Course dossier */
  .course-hero {
    min-height: 680px;
    display: grid;
    align-items: center;
    padding: 70px 0 82px;
    background:
      radial-gradient(circle at 78% 18%, color-mix(in srgb, var(--course-accent) 30%, transparent), transparent 32%),
      #0c1225;
  }

  .course-hero::after { opacity: .55; }
  .course-hero-grid { grid-template-columns: minmax(0, 1.1fr) minmax(370px, .72fr); gap: 105px; }
  .course-hero .eyebrow { margin-top: 42px; color: #bfb1ff; }
  .course-hero h1 { margin: 20px 0; font-size: var(--text-display-xl); }
  .course-hero-copy > p { font-size: var(--text-lead); line-height: 1.72; }

  .course-demo-note {
    max-width: 660px;
    display: flex;
    align-items: center;
    gap: 11px;
    margin: 0 0 27px;
    padding: 12px 14px;
    border: 1px solid rgba(255,255,255,.12);
    border-radius: 12px;
    color: #c8d0df !important;
    background: rgba(255,255,255,.04);
    font-size: 12px !important;
  }

  .course-demo-note > span {
    padding: 4px 7px;
    border-radius: 6px;
    color: #0e3528;
    background: var(--mint);
    font: 600 9px var(--font-utility);
    letter-spacing: .08em;
  }

  .course-facts { display: flex; gap: 0; margin: 0 0 34px; }
  .course-facts > div { min-width: 126px; padding: 2px 22px; border-left: 1px solid rgba(255,255,255,.15); }
  .course-facts > div:first-child { padding-left: 0; border-left: 0; }
  .course-facts dt { color: #77839c; font: 500 9px var(--font-utility); letter-spacing: .12em; text-transform: uppercase; }
  .course-facts dd { margin: 5px 0 0; color: #fff; font-size: 13px; font-weight: 750; }

  .course-cover {
    min-height: 510px;
    border-radius: 27px 27px 11px 27px;
    background: linear-gradient(150deg, color-mix(in srgb, var(--course-accent) 80%, #20104a), #171d35 78%);
    box-shadow: 30px 34px 0 rgba(4, 7, 18, .38), 0 45px 90px rgba(0,0,0,.38);
    transform: rotate(2.4deg);
  }

  .course-cover::before {
    content: "";
    position: absolute;
    inset: 13px;
    border: 1px solid rgba(255,255,255,.13);
    border-radius: 20px 20px 8px 20px;
  }

  .course-cover::after { height: 210px; border-color: var(--mint); opacity: .92; }
  .course-cover strong { font-size: 112px; }
  .cover-axis { position: absolute; inset: 20% 14%; opacity: .22; }
  .cover-axis::before, .cover-axis::after { content: ""; position: absolute; background: #fff; }
  .cover-axis::before { width: 1px; height: 100%; left: 50%; }
  .cover-axis::after { width: 100%; height: 1px; top: 50%; }
  .cover-axis i, .cover-axis b { position: absolute; width: 5px; height: 5px; border-radius: 50%; background: #fff; }
  .cover-axis i { left: 49.5%; top: 18%; }
  .cover-axis b { left: 72%; top: 49.5%; }

  .curriculum-section {
    position: relative;
    background:
      linear-gradient(90deg, transparent 0 49%, rgba(103, 91, 159, .045) 49% 49.08%, transparent 49.08%),
      #fbfafc;
  }

  .curriculum-grid { grid-template-columns: .68fr 1.32fr; gap: 110px; }
  .curriculum-intro h2 { font-size: clamp(43px, 4.3vw, 61px); }
  .curriculum-margin-note { display: flex; align-items: center; gap: 15px; margin-top: 38px; padding-top: 24px; border-top: 1px solid var(--line); }
  .curriculum-margin-note > span { color: var(--brand-dark); font-family: "Bitstream Charter", Georgia, serif; font-size: 34px; font-style: italic; }
  .curriculum-margin-note p { margin: 0; color: var(--muted); font: 600 11px/1.55 var(--font-utility); }

  .module-list { gap: 12px; }
  .module-card { border-radius: 22px 22px 8px 22px; box-shadow: 0 10px 30px rgba(31, 27, 61, .035); transition: border-color var(--dur-fast) var(--ease-out-expo), box-shadow var(--dur-med) var(--ease-out-expo); }
  .module-card[open] { border-color: color-mix(in srgb, var(--brand) 30%, var(--line)); box-shadow: 0 20px 52px rgba(45, 35, 95, .085); }
  .module-card[open] .module-number { color: #fff; background: var(--brand); }
  .module-card summary { min-height: 108px; transition: background var(--dur-fast) var(--ease-out-expo); }
  .module-card summary:hover { background: #faf9fd; }
  .module-number { border-radius: 11px 11px 4px 11px; font-family: var(--font-utility); }
  .module-lessons a { min-height: 82px; border-radius: 12px; transition: background var(--dur-fast) var(--ease-out-expo); }
  .module-lessons a:hover { background: #f7f6fc; }
  .module-lessons a:hover strong { color: var(--brand-dark); }
  .module-empty { padding: 24px 0; color: var(--muted); font-size: 13px; }
  .curriculum-empty { padding: 65px 30px; border: 1px dashed #bfc1d1; border-radius: 17px; text-align: center; }
  .curriculum-empty > span { color: var(--brand); font: 50px "Bitstream Charter", Georgia, serif; }
  .curriculum-empty h3 { margin: 10px 0 6px; font-size: 28px; }
  .curriculum-empty p { color: var(--muted); }

  /* Learning studio */
  .player-page {
    color: var(--player-text);
    background:
      radial-gradient(circle at 78% 4%, rgba(105, 72, 235, .1), transparent 26%),
      var(--navy);
  }

  .player-page h1, .player-page h2, .player-page h3 { font-family: var(--font-display); }
  .player-page > main { min-height: calc(100vh - 74px); }
  .player-header { min-height: 74px; grid-template-columns: 280px minmax(0, 1fr) auto auto; background: rgba(8, 13, 29, .93); }
  .brand-player .brand-mark { background: linear-gradient(145deg, #7f52ff, #4b26ad); }

  .player-save-note {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 0 13px;
    border: 1px solid var(--player-line);
    border-radius: 11px;
    color: #cad2e1;
    font-size: 11px;
    font-weight: 700;
  }

  .player-save-note:hover { border-color: #6f65a6; color: #fff; }
  .player-layout { grid-template-columns: 320px minmax(0, 1fr); min-height: calc(100vh - 74px); }

  .course-outline {
    top: 74px;
    height: calc(100vh - 74px);
    overflow-x: hidden;
    border-right-color: #2a3857;
    background: #0f192e;
  }

  .course-outline::before {
    content: "";
    position: absolute;
    z-index: 3;
    width: 3px;
    height: 90px;
    top: 24px;
    right: 0;
    border-radius: 99px;
    background: var(--mint);
    box-shadow: 0 0 30px rgba(67, 215, 165, .55);
  }

  .outline-heading { padding: 30px 24px 24px; }
  .outline-course-title { margin: 8px 0 0; color: #fff; font-family: var(--font-display); font-size: 20px; font-weight: 750; line-height: 1.15; }
  .outline-hint { margin: 0; padding: 13px 23px; color: #8f9bb1; font-size: 11px; line-height: 1.55; }
  .outline-hint a { min-height: 24px; display: inline-flex; align-items: center; gap: 6px; color: #b9aaff; font-weight: 750; }
  .outline-modules a { border-radius: 10px 10px 3px 10px; }
  .outline-modules a[aria-current="page"] { background: linear-gradient(90deg, #282958, #242c50); box-shadow: inset 3px 0 0 #b646f6; }
  .outline-status { border-radius: 7px 7px 2px 7px; }

  .lesson-main {
    position: relative;
  }

  .lesson-main::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image: linear-gradient(rgba(255,255,255,.018) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.018) 1px, transparent 1px);
    background-size: 46px 46px;
    mask-image: linear-gradient(to bottom, #000 0 64%, transparent 96%);
  }

  .lesson-content { position: relative; z-index: 1; width: min(calc(100% - 80px), 980px); padding: 72px 0 62px; }
  .lesson-heading { margin-bottom: 42px; }
  .lesson-heading h1 { margin-top: 16px; font-size: clamp(44px, 4.8vw, 66px); }
  .lesson-meta { display: flex; align-items: center; flex-wrap: wrap; gap: 7px 12px; }
  .lesson-mode { display: inline-flex; padding: 6px 8px; border-radius: 6px; color: #092f24; background: var(--mint); font-size: 8px; font-weight: 600; letter-spacing: .13em; }
  .lesson-duration { border-radius: 9px 9px 3px 9px; font-family: var(--font-utility); }

  .exercise-card {
    border-radius: 19px 19px 7px 19px;
    background: #151f37;
    box-shadow: 0 28px 75px rgba(0,0,0,.25), inset 0 1px 0 rgba(255,255,255,.025);
  }

  .exercise-card::before { content: ""; display: block; height: 3px; background: linear-gradient(90deg, var(--brand), var(--mint) 72%, transparent); }
  .exercise-topline { font-family: var(--font-utility); }
  .exercise-form { padding: 38px; }
  .exercise-form legend { font-family: var(--font-display); font-size: 24px; }
  .exercise-expression { border: 1px solid rgba(255,255,255,.04); border-radius: 12px 12px 4px 12px; background: #0c1428; font-family: "Bitstream Charter", Georgia, serif; font-size: clamp(31px, 4vw, 44px); }
  .answer-list { gap: 9px; }
  .answer-option { min-height: 64px; border-radius: 11px 11px 3px 11px; background: #17233d; }
  .answer-option:hover { transform: translateX(3px); }
  .answer-index { color: #71809a; font: 500 9px var(--font-utility); }
  .answer-option:has(input:checked) .answer-index { color: #c8bcff; }
  .feedback { border-radius: 12px 12px 4px 12px; }

  .video-placeholder {
    min-height: 520px;
    aspect-ratio: auto;
    border-radius: 19px 19px 7px 19px;
    background: linear-gradient(145deg, #342b72, #101a31 72%);
  }

  .video-placeholder::after { width: 760px; height: 260px; border-color: var(--mint); opacity: .52; }
  .video-demo-state { position: relative; z-index: 3; max-width: 520px; display: grid; justify-items: center; padding: 34px; text-align: center; }
  .video-status-icon { width: 62px; height: 62px; display: grid; place-items: center; margin-bottom: 22px; padding-left: 3px; border: 1px solid rgba(255,255,255,.22); border-radius: 50%; color: #151836; background: #fff; box-shadow: 0 18px 45px rgba(0,0,0,.26); }
  .video-demo-state small { color: #9ef0d2; font: 600 9px var(--font-utility); letter-spacing: .14em; }
  .video-demo-state strong { margin-top: 11px; color: #fff; font-family: var(--font-display); font-size: 29px; }
  .video-demo-state p { margin: 9px 0 0; color: #b8c3d6; font-size: 13px; }
  .video-caption { z-index: 4; }

  .lesson-copy { border-radius: 16px 16px 5px 16px; background: #141e34; }
  .article-callout { border-left: 3px solid var(--mint); border-radius: 4px 13px 13px 4px; }
  .player-empty-state { display: flex; align-items: center; gap: 18px; padding: 30px 34px; color: #d5dce9; }
  .player-empty-state > span { flex: 0 0 auto; color: #8a7cff; font: 38px "Bitstream Charter", Georgia, serif; }
  .player-empty-state strong { display: block; color: #fff; }
  .player-empty-state p { margin: 5px 0 0; color: var(--player-muted); font-size: 13px; }
  .player-empty-card { border: 1px solid var(--player-line); border-radius: 16px; background: var(--navy-soft); }

  .completion-state, .save-progress-link {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0 13px;
    border: 1px solid var(--player-line);
    border-radius: 10px;
    color: #b8c3d6;
    font-size: 11px;
    font-weight: 750;
  }

  .completion-state { border-color: rgba(67,215,165,.35); color: #c9f6e5; background: rgba(67,215,165,.08); }
  .completion-state > span { color: var(--mint); }

  /* Branded recovery states */
  .error-stage { min-height: calc(100vh - var(--header-h)); display: grid; place-items: center; padding: clamp(56px, 9vh, 104px) 20px; background: radial-gradient(circle at 82% 12%, color-mix(in srgb, var(--brand) 9%, transparent), transparent 30%), #f4f3f9; }
  .error-sheet { position: relative; width: min(100%, 760px); overflow: hidden; padding: clamp(48px, 6vw, 80px); border: 1px solid var(--line); border-radius: 26px 26px 9px 26px; background: #fff; box-shadow: 0 30px 80px rgba(29, 25, 59, .12); }
  .error-sheet::after { content: ""; position: absolute; width: 520px; height: 150px; right: -180px; bottom: -65px; border: 3px solid var(--mint); border-radius: 50%; transform: rotate(-10deg); }
  .error-code { display: block; margin-bottom: 30px; color: #e9e6f7; font: 800 var(--text-display-xl)/.78 var(--font-display); letter-spacing: -.06em; }
  .error-sheet .utility-label { color: var(--brand-dark); }
  .error-sheet h1 { max-width: 600px; margin: 16px 0 14px; font-size: var(--text-display-md); }
  .error-sheet > p { max-width: 560px; margin: 0 0 34px; color: var(--muted); font-size: var(--text-lead); line-height: 1.7; }
  .error-sheet > *, .error-actions { position: relative; z-index: 2; }
  .error-actions { display: flex; align-items: center; gap: 24px; }

  .empty-sheet .auth-mark { margin-bottom: 30px; }
  .empty-commands { position: relative; z-index: 2; width: fit-content; max-width: 100%; overflow-x: auto; margin: 0; padding: 18px 22px; border: 1px solid #232f4d; border-radius: 14px 14px 5px 14px; color: #b9f5de; background: var(--navy); font: 500 13px/1.9 var(--font-utility); }

  @media (prefers-reduced-motion: no-preference) {
    .auth-story,
    .course-hero-copy,
    .lesson-heading { animation: studio-rise 560ms cubic-bezier(.2,.7,.2,1) both; }
    .auth-card,
    .course-cover,
    .exercise-card,
    .video-placeholder,
    .player-empty-card { animation: studio-rise 620ms 90ms cubic-bezier(.2,.7,.2,1) both; }
  }

  @keyframes studio-rise {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
  }

  @media (max-width: 1040px) {
    .auth-story { padding: 45px; }
    .auth-card-wrap { padding: 38px; }
    .course-hero-grid { gap: 55px; }
    .course-facts > div { min-width: 110px; padding-inline: 15px; }
    .curriculum-grid { gap: 60px; }
    .player-layout { grid-template-columns: 285px 1fr; }
  }

  @media (max-width: 860px) {
    .mobile-menu { display: block; }
    .auth-section { padding: 20px; }
    .auth-shell { grid-template-columns: 1fr; grid-template-areas: "form" "story"; }
    .auth-story { min-height: 440px; align-items: center; }
    .auth-story p.auth-story-title { max-width: 650px; }
    .auth-story-content { max-width: 650px; }
    .auth-card-wrap { padding: 55px 36px; }
    .course-hero { min-height: 0; }
    .course-hero-grid { grid-template-columns: 1fr; }
    .course-cover { width: min(100%, 440px); }
    .curriculum-grid { grid-template-columns: 1fr; }
    .curriculum-margin-note { display: none; }
    .player-header { min-height: 68px; grid-template-columns: 1fr auto; }
    .player-save-note { display: none; }
    .player-page > main, .player-layout { min-height: calc(100vh - 68px); }
    .course-outline { top: 0; height: 100vh; }
    .lesson-content { width: min(calc(100% - 42px), 800px); padding-top: 52px; }
  }

  @media (max-width: 640px) {
    .auth-section { padding: 12px; }
    .auth-shell { border-radius: 20px; }
    .auth-story { min-height: 335px; padding: 34px 27px; }
    .auth-story::after { top: 20px; right: 18px; font-size: 75px; }
    .auth-story p.auth-story-title { font-size: 38px; }
    .auth-story p { font-size: 13px; }
    .auth-equation { margin-top: 24px; font-size: 18px; }
    .auth-rhythm { display: none; }
    .auth-card-wrap { padding: 42px 23px; }
    .auth-card h1 { font-size: 39px; }
    .course-hero h1 { font-size: clamp(47px, 13vw, 60px); }
    .course-demo-note { align-items: start; }
    .course-facts { display: grid; grid-template-columns: repeat(3, 1fr); width: 100%; }
    .course-facts > div { min-width: 0; padding-inline: 10px; }
    .course-facts dd { font-size: 11px; }
    .course-cover { min-height: 380px; box-shadow: 17px 20px 0 rgba(4, 7, 18, .38), 0 35px 70px rgba(0,0,0,.32); }
    .course-cover strong { font-size: 84px; }
    .module-card summary { min-height: 100px; }
    .lesson-content { width: min(calc(100% - 28px), 760px); }
    .lesson-heading h1 { font-size: 41px; }
    .exercise-form { padding: 27px 18px; }
    .answer-option { gap: 11px; padding-inline: 13px; }
    .answer-index { display: none; }
    .video-placeholder { min-height: 430px; }
    .video-demo-state { padding: 22px; }
    .video-demo-state strong { font-size: 25px; }
    .lesson-navigation { grid-template-columns: 1fr 1fr; }
    .lesson-navigation .completion-state,
    .lesson-navigation .save-progress-link { grid-column: 1 / -1; grid-row: 1; }
    .error-sheet { padding: 45px 28px; }
    .error-actions { align-items: stretch; flex-direction: column; }
    .error-actions .button { width: 100%; }
  }

  @media (max-width: 520px) {
    .site-header .header-actions { display: none; }
    .mobile-menu { margin-left: auto; }
  }
}

@layer app-base {
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

[id] { scroll-margin-top: calc(var(--header-h) + 20px); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

button, input { font: inherit; }

button, a { -webkit-tap-highlight-color: transparent; }

a { color: inherit; text-decoration: none; }

img, svg { display: block; max-width: 100%; }

h1, h2, h3, p { margin-top: 0; }

h1, h2, h3 { font-family: var(--font-display); line-height: 1.04; letter-spacing: -0.045em; }

.container { width: min(calc(100% - 40px), var(--container)); margin-inline: auto; }

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 10px;
  left: 10px;
  transform: translateY(-150%);
  padding: 10px 16px;
  border-radius: 8px;
  color: #fff;
  background: var(--navy);
}

.skip-link:focus { transform: translateY(0); }

:focus-visible { outline: 3px solid #8f7aff; outline-offset: 3px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  border-bottom: 1px solid color-mix(in srgb, var(--line) 58%, transparent);
  background: color-mix(in srgb, var(--canvas) 84%, transparent);
  backdrop-filter: blur(16px) saturate(1.6);
  -webkit-backdrop-filter: blur(16px) saturate(1.6);
  transition: box-shadow var(--dur-med) var(--ease-out-expo), border-color var(--dur-med) var(--ease-out-expo);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 14px 34px rgba(21, 23, 42, 0.08);
}

/* Browser zoom reduces the CSS viewport height as well as its width. Let the
   global header leave the reading area on short reflow viewports instead of
   permanently taking a large part of the screen. It stays positioned so the
   absolutely positioned mobile menu keeps the header as its containing box. */
@media (max-height: 500px) {
  .site-header {
    position: relative;
    top: auto;
  }
}

.header-inner {
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: clamp(22px, 2.6vw, 40px);
}

.brand { flex: 0 0 auto; display: inline-flex; align-items: center; gap: 11px; font-size: 20px; font-weight: 800; letter-spacing: -0.04em; white-space: nowrap; }

.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  color: #fff;
  background: var(--brand);
  box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.12);
  font-size: 21px;
}

.brand-mark svg { width: 22px; fill: currentColor; }

.main-nav { min-width: 0; display: flex; align-items: center; gap: clamp(14px, 1.35vw, 22px); margin-right: auto; }
.main-nav a { position: relative; padding-block: 6px; color: #4d5669; font-size: 14px; font-weight: 650; white-space: nowrap; }
.main-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 0; height: 2px; border-radius: 2px; background: var(--brand); transition: right var(--dur-fast) var(--ease-out-expo); }
.main-nav a:hover,
.main-nav a[aria-current="page"] { color: var(--ink); }
.main-nav a:hover::after,
.main-nav a[aria-current="page"]::after { right: 0; }

.header-actions { flex: 0 0 auto; display: flex; align-items: center; gap: 12px; }
.header-actions form { display: flex; }
.header-actions .button { white-space: nowrap; }

.header-account-menu { position: relative; }
.header-account-menu > summary {
  min-height: 42px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 15px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  font-size: 14px;
  font-weight: 750;
  list-style: none;
}
.header-account-menu > summary::-webkit-details-marker { display: none; }
.header-account-menu > summary:hover,
.header-account-menu[open] > summary { background: #fff; }
.header-account-panel {
  position: absolute;
  z-index: 110;
  top: calc(100% + 10px);
  right: 0;
  width: 230px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 18px 45px rgba(21, 23, 42, .14);
}
.header-account-panel a,
.header-account-panel button {
  width: 100%;
  min-height: 44px;
  display: flex;
  align-items: center;
  padding: 0 11px;
  border: 0;
  border-radius: 9px;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  text-align: left;
}
.header-account-panel a:hover,
.header-account-panel button:hover { background: var(--surface-soft); }
.header-account-panel form { display: block; margin-top: 4px; padding-top: 4px; border-top: 1px solid var(--line); }
.header-account-panel form button { color: var(--muted); }

/* Mobile menu: full-height panel instead of a floating dropdown. */
.mobile-menu { display: none; }
.mobile-menu summary { min-height: 44px; display: inline-flex; align-items: center; gap: 9px; padding: 0 14px; border: 1px solid var(--line); border-radius: 12px; color: var(--ink); background: color-mix(in srgb, #fff 72%, transparent); cursor: pointer; font-size: 13px; font-weight: 760; list-style: none; }
.mobile-menu summary::-webkit-details-marker { display: none; }
.mobile-menu-bars { position: relative; width: 15px; height: 2px; border-radius: 2px; background: currentColor; transition: background var(--dur-fast); }
.mobile-menu-bars::before, .mobile-menu-bars::after { content: ""; position: absolute; left: 0; width: 15px; height: 2px; border-radius: 2px; background: currentColor; transition: transform var(--dur-fast) var(--ease-out-expo); }
.mobile-menu-bars::before { transform: translateY(-5px); }
.mobile-menu-bars::after { transform: translateY(5px); }
.mobile-menu[open] .mobile-menu-bars { background: transparent; }
.mobile-menu[open] .mobile-menu-bars::before { transform: rotate(45deg); }
.mobile-menu[open] .mobile-menu-bars::after { transform: rotate(-45deg); }
.mobile-menu-panel { position: absolute; z-index: 85; top: 100%; left: 0; right: 0; height: calc(100vh - var(--header-h)); height: calc(100dvh - var(--header-h)); display: flex; flex-direction: column; overflow-y: auto; padding: 20px 22px 42px; border-top: 1px solid var(--line); background: color-mix(in srgb, var(--canvas) 96%, #fff); box-shadow: 0 40px 60px rgba(21, 23, 42, .12); }
.mobile-menu-panel nav { display: grid; }
.mobile-menu-panel nav a { display: flex; align-items: center; min-height: 60px; border-bottom: 1px solid color-mix(in srgb, var(--line) 62%, transparent); color: var(--ink); font: 760 1.65rem/1.1 var(--font-display); letter-spacing: -.03em; }
.mobile-menu-panel nav a[aria-current="page"] { color: var(--brand-dark); }
.mobile-menu-panel nav a[aria-current="page"]::after { content: "Bieżąca"; margin-left: auto; color: var(--muted); font: 750 11px/1 var(--font-body); letter-spacing: 0; }
.mobile-menu-account { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 22px; margin-top: 18px; }
.mobile-menu-account a, .mobile-menu-account button { min-height: 44px; display: inline-flex; align-items: center; padding: 0; border: 0; color: var(--muted); background: transparent; cursor: pointer; font-size: 14px; font-weight: 700; }
.mobile-menu-account a:hover, .mobile-menu-account button:hover { color: var(--ink); }
.mobile-menu-cta { align-self: stretch; margin-top: 14px; }
body.menu-open { overflow: hidden; }

/* The full desktop navigation no longer competes with account actions on
   compact laptops. Keep the useful actions visible and move page links into
   the same deliberate menu used on phones. */
@media (min-width: 861px) and (max-width: 1360px) {
  .main-nav { display: none; }
  .header-actions { margin-left: auto; }
  .header-account-menu { display: none; }
  .mobile-menu { display: block; }
}

@media (min-width: 1361px) {
  .site-header > .header-inner { width: min(1280px, calc(100% - 48px)); }
}

.button {
  min-height: 46px;
  border: 0;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 0 20px;
  cursor: pointer;
  font-weight: 750;
  transition: transform var(--dur-fast) var(--ease-out-expo), background var(--dur-fast) var(--ease-out-expo), box-shadow var(--dur-fast) var(--ease-out-expo);
}

.button:hover { transform: translateY(-1px); }
.button:active { transform: translateY(0); }
.button-small { min-height: 42px; padding-inline: 17px; font-size: 14px; }
.button-large { min-height: 56px; padding-inline: 26px; }
.button-primary { color: #fff; background: var(--brand); box-shadow: 0 10px 24px color-mix(in srgb, var(--brand) 25%, transparent); }
.button-primary:hover { background: color-mix(in srgb, var(--brand) 86%, #000); }
.button-ghost { color: var(--ink); background: transparent; box-shadow: inset 0 0 0 1px var(--line); }
.button-ghost:hover { background: #fff; }
.button-soft { color: #dcd6ff; background: #28234d; }
.button-light { color: var(--brand-dark); background: #fff; box-shadow: var(--shadow-sm); }
.text-link { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; }
.play-dot { width: 38px; height: 38px; display: grid; place-items: center; border-radius: 50%; color: var(--brand); background: #fff; box-shadow: var(--shadow-sm); font-size: 11px; }

.hero { position: relative; overflow: hidden; padding: 88px 0 105px; }
.hero::before { content: ""; position: absolute; width: 480px; height: 480px; left: -300px; top: -210px; border-radius: 50%; background: rgba(124, 92, 255, 0.1); filter: blur(2px); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 0.92fr) minmax(500px, 1.08fr); align-items: center; gap: 75px; }
.hero-copy { position: relative; z-index: 2; min-width: 0; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--brand-dark); font-size: 12px; font-weight: 850; letter-spacing: 0.15em; text-transform: uppercase; }
.eyebrow-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 0 5px rgba(77, 226, 177, 0.15); }
.hero h1 { max-width: 650px; margin: 24px 0; font-size: clamp(50px, 5vw, 76px); font-weight: 830; letter-spacing: -0.065em; }
.hero h1 span { position: relative; color: var(--brand); }
.hero h1 span::after { content: ""; position: absolute; left: 2%; right: 0; bottom: -5px; height: 9px; background: url("data:image/svg+xml,%3Csvg width='260' height='12' viewBox='0 0 260 12' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M2 9C59 2 154 1 258 6' stroke='%234DE2B1' stroke-width='5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E") center/100% 100% no-repeat; }
.hero-lead { max-width: 600px; margin-bottom: 31px; color: var(--muted); font-size: 19px; line-height: 1.72; }
.hero-actions { display: flex; align-items: center; gap: 24px; }
.trust-list { display: flex; flex-wrap: wrap; gap: 18px; margin: 36px 0 0; padding: 0; color: #596276; font-size: 13px; list-style: none; }
.trust-list li { display: flex; align-items: center; gap: 6px; }
.trust-list li span { width: 18px; height: 18px; display: inline-grid; place-items: center; border-radius: 50%; color: var(--success); background: #dff7ee; font-size: 11px; font-weight: 900; }

.hero-visual { position: relative; min-height: 585px; display: grid; place-items: center; }
.hero-visual::before { content: ""; position: absolute; inset: 8% 1% 8% 2%; border-radius: 50%; background: radial-gradient(circle, rgba(124, 92, 255, 0.24), rgba(124, 92, 255, 0) 68%); }
.orbit { position: absolute; border: 1px dashed rgba(124, 92, 255, 0.28); border-radius: 50%; transform: rotate(-18deg); }
.orbit-one { width: 590px; height: 380px; }
.orbit-two { width: 440px; height: 570px; transform: rotate(28deg); }
.lesson-preview { position: relative; z-index: 2; width: min(100%, 520px); overflow: hidden; border: 6px solid #fff; border-radius: 27px; color: var(--player-text); background: var(--navy); box-shadow: 0 40px 80px rgba(28, 33, 70, 0.23); transform: rotate(1.2deg); }
.preview-topbar { height: 56px; display: flex; align-items: center; gap: 13px; padding: 0 18px; border-bottom: 1px solid var(--player-line); color: var(--player-muted); font-size: 11px; }
.preview-dots { display: flex; gap: 5px; }
.preview-dots i { width: 7px; height: 7px; border-radius: 50%; background: #47536b; }
.preview-dots i:first-child { background: #f37f8d; }
.preview-dots i:nth-child(2) { background: var(--sun); }
.preview-dots i:nth-child(3) { background: var(--mint); }
.preview-score { margin-left: auto; color: var(--mint); font-weight: 800; }
.preview-content { padding: 34px; }
.mini-label { color: #9988ff; font-size: 10px; font-weight: 900; letter-spacing: 0.17em; }
.preview-content > p { margin: 13px 0 20px; font-size: 18px; font-weight: 720; }
.formula { margin: 22px 0 28px; text-align: center; font-family: Georgia, "Times New Roman", serif; font-size: 31px; font-style: italic; }
.formula-x { color: var(--mint); }
.preview-options { display: grid; gap: 10px; }
.preview-options > span { min-height: 51px; display: flex; align-items: center; gap: 12px; padding: 0 15px; border: 1px solid var(--player-line); border-radius: 11px; color: #dbe2ef; background: var(--navy-soft); font-family: Georgia, serif; font-size: 16px; }
.preview-options i { width: 18px; height: 18px; border: 1px solid #62708d; border-radius: 50%; }
.preview-options b { margin-left: auto; color: var(--mint); }
.preview-options .is-selected { border-color: var(--mint); background: rgba(77, 226, 177, 0.1); }
.preview-options .is-selected i { border: 5px solid var(--mint); }
.preview-feedback { display: flex; align-items: center; gap: 12px; margin-top: 18px; padding: 14px; border-radius: 11px; color: #173e32; background: #d9f8ed; }
.preview-feedback > span { font-size: 20px; }
.preview-feedback b, .preview-feedback small { display: block; }
.preview-feedback b { font-size: 13px; }
.preview-feedback small { opacity: 0.75; font-size: 11px; }
.floating-note { position: absolute; z-index: 3; min-width: 140px; padding: 15px 18px; border: 4px solid #fff; border-radius: 16px; background: #fff; box-shadow: var(--shadow-lg); }
.floating-note span, .floating-note small { display: block; }
.floating-note span { color: var(--brand-dark); font-size: 21px; font-weight: 850; }
.floating-note small { color: var(--muted); }
.note-one { left: -3%; bottom: 9%; transform: rotate(-4deg); }
.note-two { right: -2%; top: 14%; transform: rotate(5deg); }

.section { padding: var(--section-space) 0; }
.course-section { border-top: 1px solid var(--line); background: #fff; }
.section-heading h2 { margin: 15px 0 0; font-size: clamp(38px, 4vw, 55px); }
.split-heading { display: grid; grid-template-columns: 1.2fr 0.8fr; align-items: end; gap: 70px; margin-bottom: 55px; }
.split-heading > p { max-width: 480px; margin: 0 0 4px; color: var(--muted); font-size: 17px; }
.course-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.course-card { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--surface); box-shadow: 0 14px 40px rgba(38, 44, 69, 0.055); transition: transform 180ms ease, box-shadow 180ms ease; }
.course-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.course-art { position: relative; min-height: 310px; display: flex; flex-direction: column; justify-content: space-between; overflow: hidden; padding: 27px; color: #fff; background: linear-gradient(145deg, color-mix(in srgb, var(--course-accent) 78%, #101632), #11182c 78%); }
.graph-lines, .cover-grid, .video-grid { position: absolute; inset: 0; opacity: 0.18; background-image: linear-gradient(rgba(255,255,255,.35) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.35) 1px, transparent 1px); background-size: 34px 34px; mask-image: linear-gradient(to bottom right, #000, transparent 75%); }
.course-art::before { content: ""; position: absolute; width: 420px; height: 180px; right: -90px; top: 42%; border: 3px solid var(--mint); border-radius: 50%; transform: rotate(-13deg); opacity: 0.7; }
.course-symbol { position: absolute; left: 50%; top: 47%; transform: translate(-50%, -50%); color: #fff; font-family: Georgia, serif; font-size: 80px; font-style: italic; letter-spacing: -0.08em; text-shadow: 0 10px 25px rgba(0,0,0,.2); }
.course-pill { position: relative; align-self: flex-start; padding: 7px 11px; border: 1px solid rgba(255,255,255,.25); border-radius: 99px; background: rgba(255,255,255,.12); backdrop-filter: blur(10px); font-size: 11px; font-weight: 750; }
.course-art-caption { position: relative; display: flex; align-items: end; justify-content: space-between; gap: 20px; }
.course-art-caption span { font-size: 12px; opacity: .75; text-transform: uppercase; letter-spacing: .12em; }
.course-art-caption strong { max-width: 260px; text-align: right; font-size: 20px; }
.course-card-body { padding: 28px; }
.course-meta { display: flex; flex-wrap: wrap; gap: 18px; color: var(--muted); font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; }
.course-card h3 { margin: 14px 0 10px; font-size: 27px; }
.course-card h3 a:hover { color: var(--brand-dark); }
.course-card-body > p { min-height: 52px; margin-bottom: 24px; color: var(--muted); }
.course-card-footer { display: flex; align-items: center; justify-content: space-between; padding-top: 21px; border-top: 1px solid var(--line); }
.course-card-footer small, .course-card-footer strong { display: block; }
.course-card-footer small { color: var(--muted); font-size: 11px; text-transform: uppercase; letter-spacing: .1em; }
.circle-link { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--ink); font-size: 21px; transition: background 160ms ease, transform 160ms ease; }
.circle-link:hover { transform: rotate(-8deg); background: var(--brand); }
.course-card-soon { box-shadow: none; }
.course-card-soon:hover { transform: none; box-shadow: none; }
.soon-art { min-height: 310px; display: flex; flex-direction: column; justify-content: space-between; padding: 27px; color: #586175; background: repeating-linear-gradient(135deg, #f3f4f8, #f3f4f8 18px, #edeff5 18px, #edeff5 36px); }
.soon-art > span { align-self: center; margin: 55px 0 30px; color: #a6aec0; font-family: Georgia, serif; font-size: 90px; }
.soon-art small, .soon-art strong { display: block; }
.soon-art small { letter-spacing: .12em; }
.soon-art strong { color: var(--ink); font-size: 20px; }
.status-pill, .preview-label { display: inline-flex; padding: 6px 10px; border-radius: 99px; color: #6a526d; background: #f3eaf4; font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.empty-state { grid-column: 1 / -1; padding: 70px 24px; border: 1px dashed #bec5d4; border-radius: var(--radius-lg); text-align: center; }
.empty-state > span { color: var(--brand); font-size: 55px; }
.empty-state h3 { margin: 8px 0; }
.empty-state p { color: var(--muted); }

.method-section { background: var(--canvas); }
.centered-heading { max-width: 760px; margin: 0 auto 58px; text-align: center; }
.centered-heading p { max-width: 590px; margin: 20px auto 0; color: var(--muted); font-size: 17px; }
.method-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin: 0; padding: 0; counter-reset: method; list-style: none; }
.method-grid li { position: relative; padding: 16px 45px; text-align: center; }
.method-grid li:not(:last-child)::after { content: ""; position: absolute; top: 74px; right: -32px; width: 64px; border-top: 2px dashed #cfd4df; }
.method-grid li > span { position: absolute; top: 0; right: 36px; color: #c8ceda; font-size: 12px; font-weight: 900; }
.method-icon { width: 92px; height: 92px; display: grid; place-items: center; margin: 0 auto 25px; border-radius: 26px; color: var(--brand); background: #ece9ff; font-size: 39px; font-weight: 600; transform: rotate(-3deg); }
.method-grid li:nth-child(2) .method-icon { color: #087a55; background: #ddf7ee; transform: rotate(2deg); }
.method-grid li:nth-child(3) .method-icon { color: #9b6300; background: #fff2d8; }
.method-grid h3 { margin-bottom: 11px; font-size: 23px; }
.method-grid p { color: var(--muted); }

.closing-section { padding-top: 25px; background: var(--canvas); }
.closing-card { position: relative; overflow: hidden; display: flex; align-items: center; justify-content: space-between; gap: 40px; padding: 55px 64px; border-radius: var(--radius-lg); color: #fff; background: var(--brand); }
.closing-card::after { content: "∑"; position: absolute; right: 26%; bottom: -85px; color: rgba(255,255,255,.09); font-family: Georgia, serif; font-size: 240px; transform: rotate(-12deg); }
.closing-card > * { position: relative; z-index: 1; }
.closing-card h2 { max-width: 680px; margin: 12px 0 0; font-size: clamp(32px, 3.3vw, 48px); }
.eyebrow-light { color: #e7e2ff; }
.site-footer { margin-top: 0; padding: clamp(3rem, 2rem + 3vw, 4.5rem) 0 0; color: #aab5ca; background: var(--navy); }
.footer-grid { display: grid; grid-template-columns: minmax(220px, 1.25fr) repeat(3, minmax(140px, .55fr)); gap: 44px 32px; padding-bottom: clamp(2.5rem, 2rem + 2vw, 3.5rem); }
.footer-brand p { max-width: 330px; margin: 16px 0 0; color: #8b96ac; font-size: 14px; line-height: 1.7; }
.brand-footer { color: #fff; }
.brand-footer .brand-mark { width: 34px; height: 34px; border-radius: 10px; font-size: 17px; }
.footer-col { display: grid; align-content: start; gap: 4px; }
.footer-col strong { margin-bottom: 8px; color: #f4f6fb; font: 650 11px/1.4 var(--font-utility); letter-spacing: .12em; text-transform: uppercase; }
.footer-col a { display: inline-flex; align-items: center; min-height: 36px; color: #aab5ca; font-size: 14px; font-weight: 600; transition: color var(--dur-fast) var(--ease-out-expo); }
.footer-col a:hover { color: #fff; }
.footer-bottom { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 32px; padding-block: 22px; border-top: 1px solid rgba(255,255,255,.09); }
.footer-bottom p { margin: 0; font-size: 12px; }
.footer-note { color: #77839b; }

/* Course detail */
.course-hero { position: relative; overflow: hidden; padding: 80px 0 95px; color: #fff; background: var(--navy); }
.course-hero::after { content: ""; position: absolute; width: 600px; height: 600px; right: -240px; top: -300px; border-radius: 50%; background: color-mix(in srgb, var(--course-accent) 30%, transparent); filter: blur(30px); }
.course-hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1fr 430px; align-items: center; gap: 85px; }
.course-hero .eyebrow { margin-top: 48px; color: #aa9cff; }
.back-link { display: block; width: max-content; color: #abb5c9; font-size: 14px; font-weight: 700; }
.back-link:hover { color: #fff; }
.course-hero h1 { max-width: 700px; margin: 18px 0; font-size: var(--text-display-xl); }
.course-hero-copy > p { max-width: 680px; margin-bottom: 27px; color: #b9c3d6; font-size: var(--text-lead); }
.course-facts { display: flex; gap: 30px; margin-bottom: 32px; color: #aab4c8; font-size: 14px; }
.course-facts b { color: #fff; }
.course-purchase-cta { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 8px 18px; max-width: 620px; margin: -4px 0 30px; padding: 17px 18px; border: 1px solid rgba(255,255,255,.16); border-radius: 14px; background: rgba(255,255,255,.07); }
.course-purchase-cta > strong { color: #fff; font-size: 23px; }
.course-purchase-cta > span { color: #c2cbe0; font-size: 13px; }
.course-purchase-cta .button { grid-column: 3; grid-row: 1 / span 2; }
@media (max-width: 640px) {
  .course-purchase-cta { grid-template-columns: 1fr; }
  .course-purchase-cta .button { grid-column: 1; grid-row: auto; width: 100%; }
}
.course-cover { position: relative; min-height: 485px; overflow: hidden; display: flex; flex-direction: column; justify-content: space-between; padding: 38px; border: 1px solid rgba(255,255,255,.18); border-radius: 32px; background: linear-gradient(145deg, color-mix(in srgb, var(--course-accent) 82%, #0d1428), #151d32); box-shadow: 0 30px 70px rgba(0,0,0,.25); transform: rotate(2deg); }
.course-cover::after { content: ""; position: absolute; width: 520px; height: 230px; left: -50px; top: 35%; border: 4px solid var(--mint); border-radius: 50%; transform: rotate(-18deg); }
.cover-kicker, .course-cover strong, .cover-equation { position: relative; z-index: 1; }
.cover-kicker { font-size: 12px; font-weight: 850; letter-spacing: .18em; }
.course-cover strong { align-self: center; font-family: Georgia, serif; font-size: 100px; font-style: italic; }
.cover-equation { align-self: end; font-family: Georgia, serif; font-size: 21px; }
.curriculum-section { background: #fff; }
.curriculum-grid { display: grid; grid-template-columns: .72fr 1.28fr; align-items: start; gap: 95px; }
.curriculum-intro { position: sticky; top: calc(var(--header-h) + 28px); }
.curriculum-intro h2 { margin: 18px 0; font-size: clamp(38px, 4vw, 54px); }
.curriculum-intro p { color: var(--muted); font-size: 17px; }
.module-list { display: grid; gap: 14px; }
.module-card { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-md); background: #fff; }
.module-card summary { min-height: 98px; display: grid; grid-template-columns: 50px 1fr auto; align-items: center; gap: 18px; padding: 18px 24px; cursor: pointer; list-style: none; }
.module-card summary::-webkit-details-marker, .outline-modules summary::-webkit-details-marker { display: none; }
.module-number { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 13px; color: var(--brand-dark); background: var(--surface-soft); font-size: 12px; font-weight: 850; }
.module-card summary strong, .module-card summary small { display: block; }
.module-card summary small { margin-top: 3px; color: var(--muted); }
.module-count { display: flex; align-items: center; gap: 14px; color: var(--muted); font-size: 13px; }
.module-count i { font-style: normal; transition: transform 150ms ease; }
.module-card[open] .module-count i { transform: rotate(180deg); }
.module-lessons { margin: 0; padding: 0 24px 17px; list-style: none; }
.module-lessons li { border-top: 1px solid var(--line); }
.module-lessons a { min-height: 76px; display: grid; grid-template-columns: 38px 1fr auto; align-items: center; gap: 15px; }
.lesson-kind { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 10px; color: var(--brand-dark); background: var(--surface-soft); font-size: 13px; font-weight: 850; }
.lesson-kind-video { color: #b04a5a; background: #ffecef; }
.lesson-kind-quiz { color: #087a55; background: #ddf7ee; }
.module-lessons strong, .module-lessons small { display: block; }
.module-lessons strong { font-size: 14px; }
.module-lessons small { color: var(--muted); font-size: 12px; }

/* Player */
.player-page { color: var(--player-text); background: var(--navy); }
.player-page > main { min-height: calc(100vh - 68px); }
.player-header { position: sticky; z-index: 50; top: 0; min-height: 68px; display: grid; grid-template-columns: 300px 1fr auto; align-items: center; gap: 26px; padding: 0 24px; border-bottom: 1px solid var(--player-line); background: rgba(13, 20, 40, .94); backdrop-filter: blur(18px); }
.brand-player { color: #fff; font-size: 18px; }
.brand-player .brand-mark { width: 35px; height: 35px; border-radius: 10px; font-size: 17px; }
.breadcrumbs { min-width: 0; display: flex; align-items: center; gap: 9px; color: var(--player-muted); font-size: 13px; white-space: nowrap; overflow: hidden; }
.breadcrumbs a, .breadcrumbs span { overflow: hidden; text-overflow: ellipsis; }
.breadcrumbs a:hover { color: #fff; }
.player-progress { display: grid; grid-template-columns: auto 130px; align-items: center; gap: 12px; color: var(--player-muted); font-size: 12px; }
progress { overflow: hidden; height: 6px; border: 0; border-radius: 99px; color: var(--brand); background: #2a3550; }
progress::-webkit-progress-bar { border-radius: 99px; background: #2a3550; }
progress::-webkit-progress-value { border-radius: 99px; background: var(--brand); }
progress::-moz-progress-bar { border-radius: 99px; background: var(--brand); }
.outline-close { display: none; }
.outline-toggle { min-height: 40px; display: inline-flex; align-items: center; gap: 8px; padding: 0 14px; border: 1px solid var(--player-line); border-radius: 9px; color: #fff; background: var(--navy-soft); cursor: pointer; font-size: 12px; font-weight: 750; }
.outline-toggle-icon { font-size: 14px; line-height: 1; }
.outline-toggle-count { padding: 3px 8px; border-radius: 99px; color: var(--player-muted); background: rgba(255, 255, 255, .1); font-size: 10px; font-weight: 800; }
.player-layout { display: grid; grid-template-columns: 310px minmax(0, 1fr); min-height: calc(100vh - 68px); }
.course-outline { position: sticky; top: 68px; height: calc(100vh - 68px); overflow-y: auto; display: flex; flex-direction: column; border-right: 1px solid var(--player-line); background: #10192e; scrollbar-width: thin; scrollbar-color: #394b70 transparent; }
.outline-heading { padding: 27px 23px 22px; border-bottom: 1px solid var(--player-line); }
.outline-course-title { margin: 8px 0 0; font-size: 19px; }
.outline-progress-mobile { display: none; }
.outline-modules { padding: 12px; }
.outline-modules details { border-bottom: 1px solid rgba(42,56,87,.72); }
.outline-modules summary { min-height: 62px; display: grid; grid-template-columns: 29px 1fr auto; align-items: center; gap: 9px; padding: 9px 8px; color: #fff; cursor: pointer; list-style: none; }
.outline-modules summary > span { color: #75829b; font-size: 10px; font-weight: 800; }
.outline-modules summary strong { font-size: 13px; }
.outline-modules summary small { min-width: 24px; height: 24px; display: grid; place-items: center; border-radius: 99px; color: var(--player-muted); background: #202c45; font-size: 10px; }
.outline-modules ol { margin: 0; padding: 0 0 12px; list-style: none; }
.outline-modules a { min-height: 62px; display: grid; grid-template-columns: 28px 1fr; align-items: center; gap: 10px; padding: 8px 9px; border-radius: 11px; color: var(--player-muted); }
.outline-modules a:hover { color: #fff; background: rgba(255,255,255,.035); }
.outline-modules a[aria-current="page"] { color: #fff; background: #242c55; box-shadow: inset 3px 0 0 var(--brand); }
.outline-status { width: 24px; height: 24px; display: grid; place-items: center; border: 1px solid #4b5a78; border-radius: 8px; font-size: 9px; }
a[aria-current="page"] .outline-status { border-color: #947fff; color: #bfb4ff; background: #3e3478; }
.outline-modules a strong, .outline-modules a small { display: block; }
.outline-modules a strong { overflow: hidden; font-size: 12px; text-overflow: ellipsis; white-space: nowrap; }
.outline-modules a small { margin-top: 1px; color: var(--player-muted); font-size: 10px; }
.outline-back { margin: auto 20px 22px; padding-top: 18px; border-top: 1px solid var(--player-line); color: #8d99b0; font-size: 12px; font-weight: 700; }
.lesson-main { min-width: 0; }
.lesson-content { width: min(calc(100% - 70px), 920px); margin: 0 auto; padding: 67px 0 55px; }
.lesson-heading { display: flex; align-items: start; justify-content: space-between; gap: 35px; margin-bottom: 36px; }
.lesson-heading .eyebrow { color: #9b8aff; }
.lesson-heading h1 { margin: 13px 0 8px; font-size: clamp(34px, 4vw, 52px); }
.lesson-heading p { max-width: 650px; margin: 0; color: var(--player-muted); }
.lesson-duration { flex: 0 0 auto; margin-top: 26px; padding: 8px 11px; border: 1px solid var(--player-line); border-radius: 9px; color: var(--player-muted); font-size: 11px; }
.exercise-card { overflow: hidden; border: 1px solid var(--player-line); border-radius: 22px; background: var(--navy-soft); box-shadow: 0 24px 60px rgba(0,0,0,.18); }
.exercise-topline { min-height: 48px; display: flex; align-items: center; justify-content: space-between; padding: 0 25px; border-bottom: 1px solid var(--player-line); color: #8d9ab2; font-size: 10px; font-weight: 850; letter-spacing: .13em; }
.exercise-form { padding: 34px; }
.exercise-form fieldset { margin: 0; padding: 0; border: 0; }
.exercise-form legend { float: left; width: 100%; margin-bottom: 23px; color: #fff; font-size: 21px; font-weight: 720; }
.exercise-expression { clear: both; overflow-x: auto; margin: 24px 0 31px; padding: 22px; border-radius: 14px; text-align: center; color: #fff; background: #0f172b; font-family: Georgia, "Times New Roman", serif; font-size: clamp(27px, 4vw, 39px); font-style: italic; letter-spacing: .02em; }
.hint { clear: both; margin: 0 0 25px; color: #d6b866; }
.hint summary { width: max-content; cursor: pointer; font-size: 12px; font-weight: 800; list-style: none; text-transform: uppercase; letter-spacing: .08em; }
.hint summary::-webkit-details-marker { display: none; }
.hint p { max-width: 700px; margin: 12px 0 0; padding: 13px 16px; border-left: 2px solid #d6b866; color: #d8cda9; background: rgba(214,184,102,.06); font-size: 14px; }
.answer-list { clear: both; display: grid; gap: 11px; }
.answer-option { min-height: 60px; display: flex; align-items: center; gap: 15px; padding: 12px 17px; border: 1px solid #334365; border-radius: 13px; color: #dae0ec; background: #17223a; cursor: pointer; transition: border 150ms ease, background 150ms ease; }
.answer-option:hover { border-color: #6e62bd; background: #1b2843; }
.answer-option:has(input:checked) { border-color: #917cff; background: rgba(124,92,255,.15); box-shadow: inset 0 0 0 1px #917cff; }
.answer-option input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.radio-ui { flex: 0 0 auto; width: 22px; height: 22px; border: 1.5px solid #596a8a; border-radius: 50%; }
.answer-option input:checked + .radio-ui { border: 6px solid #917cff; background: #fff; }
.answer-option input:focus-visible + .radio-ui { outline: 3px solid #8f7aff; outline-offset: 3px; }
.exercise-actions { display: flex; align-items: center; gap: 18px; margin-top: 25px; }
.exercise-actions > span { color: var(--player-muted); font-size: 11px; }
.feedback { display: flex; gap: 14px; margin: 0 34px 34px; padding: 18px; border-radius: 14px; }
.feedback-icon { flex: 0 0 auto; width: 31px; height: 31px; display: grid; place-items: center; border-radius: 50%; font-weight: 900; }
.feedback strong { display: block; margin: 1px 0 3px; }
.feedback p { margin: 0; font-size: 13px; }
.feedback-success { color: #ccf7e8; background: rgba(22,146,103,.18); border: 1px solid rgba(77,226,177,.33); }
.feedback-success .feedback-icon { color: #063c2c; background: var(--mint); }
.feedback-error { color: #ffd8de; background: rgba(196,61,77,.14); border: 1px solid rgba(243,127,141,.3); }
.feedback-error .feedback-icon { color: #4a1119; background: #f37f8d; }
.feedback-warning { color: #ffe9b9; background: rgba(166,101,0,.14); border: 1px solid rgba(255,204,102,.25); }
.feedback-warning .feedback-icon { color: #533400; background: var(--sun); }
.video-placeholder { position: relative; aspect-ratio: 16 / 9; overflow: hidden; display: grid; place-items: center; border: 1px solid var(--player-line); border-radius: 22px; background: linear-gradient(145deg, #3d337c, #141e36 70%); }
.video-placeholder::after { content: ""; position: absolute; width: 580px; height: 220px; border: 4px solid var(--mint); border-radius: 50%; transform: rotate(-13deg); opacity: .45; }
.video-play { position: relative; z-index: 2; width: 80px; height: 80px; display: grid; place-items: center; padding-left: 5px; border: 6px solid rgba(255,255,255,.24); border-radius: 50%; color: var(--brand-dark); background: #fff; cursor: pointer; font-size: 23px; box-shadow: 0 15px 40px rgba(0,0,0,.25); }
.video-caption { position: absolute; z-index: 2; left: 28px; bottom: 24px; }
.video-caption span, .video-caption strong { display: block; }
.video-caption span { color: #c4baff; font-size: 10px; font-weight: 850; letter-spacing: .15em; text-transform: uppercase; }
.video-caption strong { margin-top: 4px; font-size: 23px; }
.lesson-copy { margin-top: 30px; padding: 30px 34px; border: 1px solid var(--player-line); border-radius: 18px; color: #c5cede; background: var(--navy-soft); }
.lesson-copy h2 { color: #fff; }
.lesson-copy p:last-child { margin-bottom: 0; }
details.lesson-copy { padding: 0; }
details.lesson-copy > summary { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 20px 34px; cursor: pointer; list-style: none; }
details.lesson-copy > summary::-webkit-details-marker { display: none; }
details.lesson-copy > summary h2 { margin: 0; }
details.lesson-copy .lesson-copy-caret { color: var(--player-muted); font-size: 15px; transition: transform 160ms ease; }
details.lesson-copy[open] .lesson-copy-caret { transform: rotate(180deg); }
details.lesson-copy .lesson-copy-body { padding: 0 34px 28px; }
.lesson-article { margin-top: 0; font-size: 17px; line-height: 1.85; }
.article-callout { display: flex; gap: 15px; margin-bottom: 26px; padding: 18px; border-radius: 14px; color: #e8e2ff; background: rgba(124,92,255,.13); }
.article-callout span { color: #a18fff; }
.article-callout p { margin: 0; font-weight: 700; }
.lesson-navigation { display: grid; grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); align-items: center; gap: 16px; margin-top: 32px; padding-top: 26px; border-top: 1px solid var(--player-line); }
.lesson-nav-link { display: grid; grid-template-columns: 35px 1fr; align-items: center; column-gap: 10px; color: var(--player-muted); }
.lesson-nav-link > span { grid-row: 1 / 3; width: 34px; height: 34px; display: grid; place-items: center; border: 1px solid var(--player-line); border-radius: 10px; }
.lesson-nav-link small, .lesson-nav-link strong { display: block; }
.lesson-nav-link small { font-size: 9px; text-transform: uppercase; letter-spacing: .1em; }
.lesson-nav-link strong { overflow: hidden; color: #fff; font-size: 12px; text-overflow: ellipsis; white-space: nowrap; }
.lesson-next { grid-template-columns: 1fr 35px; text-align: right; }
.lesson-next > span { grid-column: 2; }
.lesson-next small, .lesson-next strong { grid-column: 1; }
.outline-backdrop { display: none; }

/* Auth */
.auth-section { min-height: calc(100vh - 82px); display: grid; place-items: center; padding: 70px 20px; background: radial-gradient(circle at 50% 10%, rgba(124,92,255,.13), transparent 40%); }
.auth-card { width: min(100%, 470px); padding: 42px; border: 1px solid var(--line); border-radius: 25px; background: #fff; box-shadow: var(--shadow-lg); }
.auth-mark { width: 52px; height: 52px; display: grid; place-items: center; margin-bottom: 25px; border-radius: 15px; color: #fff; background: var(--brand); font-family: Georgia, serif; font-size: 25px; }
.auth-card h1 { margin: 12px 0 8px; font-size: 38px; }
.auth-card > p, .auth-card > small { color: var(--muted); }
.auth-form { display: grid; margin: 27px 0 20px; }
.auth-form label { margin: 14px 0 7px; color: #475066; font-size: 13px; font-weight: 750; }
.auth-form input { width: 100%; min-height: 52px; padding: 0 15px; border: 1px solid #cfd5e1; border-radius: 11px; color: var(--ink); background: #fbfcfe; }
.auth-form input:focus { border-color: var(--brand); outline: 3px solid color-mix(in srgb, var(--brand) 18%, transparent); }
.auth-form .button { margin-top: 24px; }
.form-error { margin-top: 18px; padding: 11px 13px; border-radius: 9px; color: #922b38; background: #ffeaed; font-size: 13px; }

@media (max-width: 1040px) {
  .hero { padding-top: 70px; }
  .hero-grid { grid-template-columns: 1fr 0.9fr; gap: 30px; }
  .hero-visual { min-height: 510px; }
  .lesson-preview { width: 460px; transform: scale(.9) rotate(1deg); }
  .note-one { left: 0; }
  .note-two { right: 0; }
  .course-hero-grid { grid-template-columns: 1fr 340px; gap: 45px; }
  .course-cover { min-height: 410px; }
  .curriculum-grid { gap: 55px; }
  .player-header { grid-template-columns: auto 1fr auto auto; }
  .player-progress { grid-template-columns: auto 100px; }
  .player-layout { grid-template-columns: 280px 1fr; }
  .lesson-content { width: min(calc(100% - 45px), 900px); }
  .footer-grid { grid-template-columns: minmax(220px, 1fr) repeat(2, minmax(150px, .7fr)); }
  .footer-grid > :last-child { grid-column: 2 / -1; }
}

@media (max-width: 860px) {
  .header-inner { min-height: var(--header-h); gap: 20px; }
  .main-nav { display: none; }
  .header-actions { margin-left: auto; }
  .header-cta { display: none; }
  .hero { padding: 60px 0 75px; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-copy { max-width: 720px; }
  .hero-visual { min-height: 520px; }
  .lesson-preview { width: min(100%, 530px); transform: none; }
  .note-one { left: 6%; }
  .note-two { right: 5%; }
  .split-heading { grid-template-columns: 1fr; gap: 20px; }
  .course-grid { grid-template-columns: 1fr; }
  .method-grid li { padding-inline: 22px; }
  .closing-card { padding: 45px; }
  .course-hero-grid { grid-template-columns: 1fr; }
  .course-cover { width: min(100%, 420px); min-height: 450px; margin: 0 auto; }
  .curriculum-grid { grid-template-columns: 1fr; }
  .curriculum-intro { position: static; }
  .player-header { min-height: 64px; grid-template-columns: 1fr auto; padding-inline: 17px; }
  .brand-player { min-height: 44px; display: inline-flex; align-items: center; gap: 9px; font-size: 17px; }
  .breadcrumbs, .player-progress { display: none; }
  .outline-toggle { min-height: 40px; display: inline-flex; align-items: center; padding: 0 14px; border: 1px solid var(--player-line); border-radius: 9px; color: #fff; background: var(--navy-soft); cursor: pointer; font-size: 12px; font-weight: 750; }
  .player-layout { display: block; min-height: calc(100vh - 64px); }
  .course-outline { position: fixed; z-index: 80; top: 0; left: 0; width: min(88vw, 350px); height: 100vh; visibility: hidden; transform: translateX(-102%); transition: transform 190ms ease, visibility 0s linear 190ms; box-shadow: 20px 0 60px rgba(0,0,0,.35); }
  .outline-heading { display: flex; justify-content: space-between; gap: 16px; }
  .outline-close { flex: 0 0 auto; width: 38px; height: 38px; display: grid; place-items: center; padding: 0; border: 1px solid var(--player-line); border-radius: 9px; color: #fff; background: transparent; font-size: 25px; cursor: pointer; }
  .outline-progress-mobile { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 8px; padding: 17px 23px; border-bottom: 1px solid var(--player-line); color: var(--player-muted); font-size: 12px; }
  .outline-progress-mobile strong { color: #fff; }
  .outline-progress-mobile progress { grid-column: 1 / -1; width: 100%; }
  .outline-backdrop { position: fixed; z-index: 70; inset: 0; background: rgba(3, 8, 20, .68); backdrop-filter: blur(3px); }
  .outline-open { overflow: hidden; }
  .outline-open .course-outline { visibility: visible; transform: translateX(0); transition: transform 190ms ease, visibility 0s linear 0s; }
  .outline-open .outline-backdrop { display: block; }
  .lesson-content { width: min(calc(100% - 36px), 760px); padding-top: 45px; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid > :last-child { grid-column: auto; }
}

@media (max-width: 640px) {
  .container { width: min(calc(100% - 28px), var(--container)); }
  .brand { font-size: 18px; }
  .brand-mark { width: 34px; height: 34px; }
  .button-small { min-height: 40px; }
  .header-inner { justify-content: space-between; }
  .header-actions { flex: 0 0 auto; margin-left: 0; }
  .header-actions .button-ghost { padding-inline: 12px; }
  .hero h1 { max-width: 100%; overflow-wrap: break-word; font-size: clamp(42px, 12vw, 54px); }
  .hero-lead { font-size: 17px; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .hero-actions .button { width: 100%; }
  .hero-actions .text-link { justify-content: center; }
  .trust-list { display: grid; gap: 10px; }
  .hero-visual { min-height: 450px; margin-inline: -10px; }
  .lesson-preview { border-width: 4px; border-radius: 21px; }
  .preview-content { padding: 23px 18px; }
  .formula { font-size: 26px; }
  .floating-note { display: none; }
  .section { padding: var(--section-space-sm) 0; }
  .section-heading h2 { font-size: 38px; }
  .course-art, .soon-art { min-height: 260px; padding: 22px; }
  .course-symbol { font-size: 64px; }
  .course-card-body { padding: 22px; }
  .method-grid { grid-template-columns: 1fr; gap: 50px; }
  .method-grid li:not(:last-child)::after { display: none; }
  .method-grid li > span { right: 22%; }
  .closing-card { align-items: stretch; flex-direction: column; padding: 34px 28px; }
  .closing-card .button { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; gap: 34px; }
  .footer-bottom { flex-direction: column; align-items: start; gap: 6px; }
  .course-hero { padding: 45px 0 70px; }
  .course-hero .eyebrow { margin-top: 38px; }
  .course-facts { flex-wrap: wrap; gap: 15px 22px; }
  .course-cover { min-height: 360px; padding: 28px; }
  .course-cover strong { font-size: 76px; }
  .module-card summary { grid-template-columns: 42px 1fr; padding: 15px; }
  .module-count { grid-column: 2; margin-top: -10px; }
  .module-lessons { padding-inline: 15px; }
  .module-lessons a { grid-template-columns: 35px 1fr auto; }
  .lesson-heading { display: block; }
  .lesson-heading h1 { font-size: 36px; }
  .lesson-duration { display: inline-flex; margin-top: 15px; }
  .exercise-form { padding: 24px 18px; }
  .exercise-topline { padding-inline: 18px; }
  .exercise-actions { align-items: stretch; flex-direction: column; }
  .feedback { margin: 0 18px 24px; }
  .lesson-navigation { grid-template-columns: 1fr 1fr; }
  .lesson-navigation form { grid-column: 1 / -1; grid-row: 1; }
  .lesson-navigation form .button { width: 100%; }
  .lesson-nav-link { grid-row: 2; }
  .auth-section { align-items: start; padding: 35px 14px; }
  .auth-card { padding: 30px 22px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; }
}
}

/* Premium learning studio — the proof trail is the signature, not decoration. */
@layer app-premium {
  .visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    overflow: hidden !important;
    margin: -1px !important;
    padding: 0 !important;
    border: 0 !important;
    clip: rect(0 0 0 0) !important;
    clip-path: inset(50%) !important;
    white-space: nowrap !important;
  }

  .player-header {
    grid-template-columns: 280px minmax(180px, 1fr) auto auto;
    gap: 18px;
  }

  .breadcrumbs [aria-current="page"] { color: #eef1f8; }

  .focus-toggle,
  .bookmark-button,
  .video-convenience button,
  .video-convenience select,
  .video-chapters button {
    font-family: var(--font-body);
  }

  .focus-toggle {
    min-height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0 13px;
    border: 1px solid var(--player-line);
    border-radius: 10px 10px 3px 10px;
    color: #cbd3e2;
    background: rgba(255, 255, 255, .025);
    cursor: pointer;
    font-size: 11px;
    font-weight: 750;
  }

  .focus-toggle:hover,
  .focus-toggle[aria-pressed="true"] { border-color: #786caf; color: #fff; background: #242044; }
  .focus-toggle > span:first-child { color: var(--mint); font-family: var(--font-utility); }

  .outline-modules { position: relative; }
  .outline-modules::before { content: ""; position: absolute; top: 34px; bottom: 38px; left: 33px; width: 1px; background: #263653; }
  .outline-modules details { position: relative; background: #0f192e; }
  .outline-modules summary { position: relative; }
  .outline-modules summary > span { position: relative; z-index: 1; min-height: 21px; display: grid; place-items: center; background: #0f192e; }
  .outline-modules ol { position: relative; }
  .outline-modules li { position: relative; }
  .outline-modules a,
  .outline-lesson {
    position: relative;
    min-height: 64px;
    display: grid;
    grid-template-columns: 28px minmax(0, 1fr);
    align-items: center;
    gap: 10px;
    padding: 8px 9px;
    border-radius: 10px 10px 3px 10px;
    color: var(--player-muted);
  }

  .outline-modules .outline-status { position: relative; z-index: 2; background: #0f192e; }
  .outline-modules .is-complete .outline-status { border-color: rgba(67, 215, 165, .55); color: #aaf3d8; background: #12372f; }
  .outline-modules .is-current::after { content: "TERAZ"; position: absolute; z-index: 2; top: 3px; right: 8px; color: #a99cff; font: 600 7px var(--font-utility); letter-spacing: .12em; }
  .outline-modules .is-current a { padding-top: 13px; }
  .outline-modules .is-locked { opacity: .62; }
  .outline-modules .outline-lesson strong,
  .outline-modules .outline-lesson small { display: block; }
  .outline-modules .outline-lesson strong {
    overflow: hidden;
    font-size: 12px;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .outline-modules .outline-lesson small { margin-top: 2px; font-size: 10px; line-height: 1.35; }
  .outline-lesson.is-disabled { cursor: not-allowed; }
  .outline-program-preview {
    position: relative;
    z-index: 2;
    display: grid;
    gap: 5px;
    margin: 16px 5px 6px;
    padding: 14px 13px;
    border: 1px solid color-mix(in srgb, var(--studio-action, #61d2c4) 28%, var(--player-line));
    border-radius: 11px 11px 3px 11px;
    background:
      radial-gradient(circle at 92% 12%, color-mix(in srgb, var(--studio-action, #61d2c4) 14%, transparent), transparent 42%),
      var(--studio-surface, #142238);
  }
  .outline-program-preview .mini-label { font-size: 8px; }
  .outline-program-preview strong { color: var(--studio-text, #fff); font-size: 11px; line-height: 1.35; }
  .outline-program-preview small { color: var(--studio-muted, #8d99b0); font-size: 9px; line-height: 1.45; }
  .outline-preview-module summary strong { color: var(--studio-text, #fff); }
  .outline-modules .is-program-preview { opacity: .76; }
  .outline-modules .is-program-preview .outline-status {
    border-style: dashed;
    color: var(--studio-action, #61d2c4);
  }
  .outline-full-course {
    min-height: 58px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin: 3px 17px 16px;
    padding: 10px 13px;
    border: 1px solid var(--studio-control-line, #41516c);
    border-radius: 10px 10px 3px 10px;
    color: var(--studio-text, #fff);
    background: var(--studio-surface, #142238);
  }
  .outline-full-course:hover { border-color: var(--studio-action, #61d2c4); color: var(--studio-action-hover, #8ce0d5); }
  .outline-full-course span:first-child { display: grid; gap: 3px; }
  .outline-full-course small { color: var(--studio-action, #61d2c4); font: 600 7px var(--font-utility); letter-spacing: .12em; }
  .outline-full-course strong { font-size: 10px; }
  .outline-full-course > span:last-child { font-size: 18px; }

  .focus-mode .player-layout { grid-template-columns: minmax(0, 1fr); }
  .focus-mode .course-outline { display: none; }
  .focus-mode .lesson-content { width: min(calc(100% - 80px), 1080px); }

  @media (min-width: 861px) {
    .outline-collapsed .player-layout { grid-template-columns: minmax(0, 1fr); }
    .outline-collapsed .course-outline { display: none; }
    .outline-collapsed .lesson-content { width: min(calc(100% - 80px), 1080px); }
  }

  .outline-remaining { margin: 0; padding: 14px 23px; border-bottom: 1px solid var(--player-line); color: var(--studio-muted, #8d99b0); font-size: 12px; }
  .outline-remaining strong { color: var(--studio-text, #fff); }

  .video-resume-note { margin: 10px 4px 0; color: var(--studio-muted, #8d99b0); font-size: 13px; }
  .video-resume-note[hidden] { display: none; }

  @keyframes lesson-cta-pulse {
    0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--studio-action, #61d2c4) 45%, transparent); }
    55% { box-shadow: 0 0 0 12px transparent; }
  }
  .lesson-video-ended .lesson-progress-action .button-primary { animation: lesson-cta-pulse 1.7s ease-in-out 4; }
  @media (prefers-reduced-motion: reduce) {
    .lesson-video-ended .lesson-progress-action .button-primary { animation: none; outline: 3px solid var(--studio-action, #61d2c4); outline-offset: 3px; }
  }
  .focus-mode .breadcrumbs { opacity: .55; }

  .lesson-heading-copy { min-width: 0; }
  .player-messages { display: grid; gap: 8px; margin: 0 0 24px; }
  .player-message { margin: 0; padding: 12px 14px; border: 1px solid #42516d; border-radius: 10px 10px 3px 10px; color: #d8e0eb; background: #152139; font-size: 11px; }
  .player-message-success { border-color: rgba(67, 215, 165, .38); color: #c7f5e4; background: rgba(27, 130, 94, .16); }
  .player-message-error { border-color: rgba(243, 127, 141, .34); color: #ffd8de; background: rgba(196, 61, 77, .14); }
  .lesson-heading-tools { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
  .lesson-heading-tools form { display: flex; }
  .lesson-status,
  .bookmark-button {
    min-height: 34px;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 0 10px;
    border: 1px solid var(--player-line);
    border-radius: 9px 9px 3px 9px;
    color: #aeb9cb;
    background: rgba(255, 255, 255, .02);
    font-size: 10px;
    font-weight: 750;
  }

  .lesson-status > span { color: #b3a6ff; font-size: 8px; }
  .lesson-status.is-complete { border-color: rgba(67, 215, 165, .34); color: #cbf6e6; background: rgba(67, 215, 165, .08); }
  .lesson-status.is-complete > span { color: var(--mint); }
  .bookmark-button { color: #c7cfde; cursor: pointer; }
  .bookmark-button:hover { border-color: #786cae; color: #fff; }
  .bookmark-button > span:first-child { color: #a999ff; font-size: 14px; }
  .bookmark-button.is-active { border-color: rgba(242, 189, 80, .38); color: #ffe5ab; background: rgba(242, 189, 80, .08); }
  .bookmark-button.is-active > span:first-child { color: var(--sun); }
  .lesson-heading-tools .lesson-duration { min-height: 34px; display: inline-flex; align-items: center; margin: 0; padding-block: 0; }

  .quiz-studio { display: grid; gap: 15px; }
  .question-trail {
    padding: 0 18px;
    border: 1px solid var(--player-line);
    border-radius: 14px 14px 4px 14px;
    background: rgba(10, 17, 34, .78);
  }

  .question-trail > summary { min-height: 54px; display: flex; align-items: center; justify-content: space-between; gap: 14px; cursor: pointer; list-style: none; }
  .question-trail > summary::-webkit-details-marker { display: none; }
  .question-trail-summary-side { display: inline-flex; align-items: center; gap: 12px; }
  .question-trail-caret { color: #a795ff; font-size: 14px; transition: transform 160ms ease; }
  .question-trail[open] .question-trail-caret { transform: rotate(45deg); }
  .question-trail > nav { padding: 14px 0 16px; border-top: 1px solid #273753; }
  .question-trail-label,
  .question-trail-count { color: #8e9ab0; font: 600 9px var(--font-utility); letter-spacing: .1em; text-transform: uppercase; }
  .question-trail ol { position: relative; display: flex; align-items: center; gap: 8px; margin: 0; padding: 0; list-style: none; }
  .question-trail ol::before { content: ""; position: absolute; left: 17px; right: 17px; top: 50%; height: 1px; background: #34425f; }
  .question-trail li { position: relative; z-index: 1; }
  .question-step { width: 34px; height: 34px; display: grid; place-items: center; border: 1px solid #43516c; border-radius: 9px 9px 3px 9px; color: #aeb8ca; background: #111b30; font: 600 10px var(--font-utility); }
  .question-step:hover { border-color: #8877de; color: #fff; }
  .question-step.is-answered { border-color: rgba(67, 215, 165, .45); color: #aaf1d7; background: #14342f; }
  .question-step.is-current { border-color: #9c89ff; color: #fff; background: #5c43ce; box-shadow: 0 0 0 4px rgba(124, 92, 255, .16); }

  .quiz-studio .exercise-card { overflow: visible; }
  .quiz-studio .exercise-card::before { border-radius: 19px 19px 0 0; }
  .quiz-studio .exercise-form { padding-top: 40px; }
  .quiz-studio .exercise-form fieldset:disabled .answer-option { opacity: .78; cursor: default; }
  .quiz-studio .exercise-form fieldset:disabled .answer-option:hover { border-color: #334365; background: #17233d; transform: none; }
  .exercise-closed { margin: 24px 0 0; padding: 13px 15px; border: 1px solid rgba(67, 215, 165, .25); border-radius: 9px; background: rgba(67, 215, 165, .06); }
  .exercise-closed > span { color: #b9decf; }
  .exercise-closed > span > span { color: var(--mint); }
  .answer-option { position: relative; }
  .answer-option .answer-index { width: 24px; height: 24px; display: grid; place-items: center; border: 1px solid #3b4a67; border-radius: 7px 7px 2px 7px; color: #9eabc0; background: #111a2f; font-size: 10px; }
  .answer-option:has(input:checked) .answer-index { border-color: #8d7ae4; color: #fff; background: #5543ad; }
  .check-ui { flex: 0 0 auto; width: 22px; height: 22px; display: grid; place-items: center; border: 1.5px solid #596a8a; border-radius: 6px 6px 2px 6px; }
  .answer-option input:checked + .check-ui { border-color: #917cff; background: #917cff; }
  .answer-option input:checked + .check-ui::after { content: "✓"; color: #fff; font-size: 13px; font-weight: 900; }
  .answer-option input:focus-visible + .check-ui { outline: 3px solid #8f7aff; outline-offset: 3px; }

  .short-answer-field { clear: both; display: grid; gap: 9px; }
  .short-answer-field > span { color: #aeb9cb; font-size: 12px; font-weight: 750; }
  .short-answer-field input { width: 100%; min-height: 72px; padding: 0 20px; border: 1px solid #3b4b6c; border-radius: 13px 13px 4px 13px; color: #fff; background: #0d162a; font: 600 clamp(20px, 3vw, 28px) var(--font-utility); }
  .short-answer-field input::placeholder { color: #62718a; }
  .short-answer-field input:focus { border-color: #927cff; outline: 3px solid rgba(143, 122, 255, .18); }
  .exercise-actions kbd,
  .video-shortcuts kbd { padding: 2px 5px; border: 1px solid #46536d; border-bottom-width: 2px; border-radius: 4px; color: #c9d1df; background: #111a2d; font: 500 9px var(--font-utility); }

  .feedback > div { min-width: 0; }
  .feedback-next { min-height: 34px; display: inline-flex; align-items: center; gap: 8px; margin-top: 11px; font-size: 11px; font-weight: 800; text-decoration: underline; text-underline-offset: 3px; }
  .feedback-next:hover { color: #fff; }
  .question-navigation { min-height: 38px; display: flex; justify-content: space-between; gap: 15px; padding: 0 4px; }
  .question-navigation a { display: inline-flex; align-items: center; gap: 8px; color: #aeb8c9; font-size: 11px; font-weight: 750; }
  .question-navigation a:hover { color: #fff; }

  .quiz-result {
    overflow: hidden;
    display: grid;
    grid-template-columns: 210px minmax(0, 1fr);
    border: 1px solid #3b4a68;
    border-radius: 18px 18px 6px 18px;
    background: #131e35;
  }

  .quiz-result-score { display: grid; align-content: center; gap: 8px; padding: 32px; border-right: 1px solid #33415e; background: #0e172a; }
  .quiz-result-score > span,
  .result-state { color: #97a4b9; font: 600 9px var(--font-utility); letter-spacing: .13em; }
  .quiz-result-score strong { color: #fff; font: 760 54px/.95 var(--font-display); letter-spacing: -.055em; }
  .quiz-result-score progress { width: 100%; margin-top: 7px; }
  .quiz-result.is-passed .quiz-result-score progress::-webkit-progress-value { background: var(--mint); }
  .quiz-result.is-passed .quiz-result-score progress::-moz-progress-bar { background: var(--mint); }
  .quiz-result.is-retry .quiz-result-score progress::-webkit-progress-value { background: var(--sun); }
  .quiz-result.is-retry .quiz-result-score progress::-moz-progress-bar { background: var(--sun); }
  .quiz-result-copy { padding: 32px 36px; }
  .quiz-result.is-passed .result-state { color: #8ee8c8; }
  .quiz-result.is-retry .result-state { color: #f2ce82; }
  .quiz-result-copy h2 { margin: 9px 0 8px; color: #fff; font-size: 28px; }
  .quiz-result-copy p { max-width: 590px; margin: 0; color: #aeb9ca; font-size: 13px; }
  .quiz-result-copy form { margin-top: 18px; }
  .button-quiet { min-height: 39px; padding-inline: 14px; border: 1px solid #46536c; color: #d8dfeb; background: transparent; font-size: 11px; }
  .button-quiet:hover { border-color: #7d6fc2; background: #211f3d; }

  .video-studio { overflow: hidden; border: 1px solid var(--player-line); border-radius: 19px; background: #101a2f; box-shadow: 0 28px 75px rgba(0, 0, 0, .25); }
  .video-frame { position: relative; aspect-ratio: 16 / 9; display: grid; place-items: center; background: #050914; }
  .video-frame video { width: 100%; height: 100%; display: block; object-fit: contain; background: #050914; }
  .video-convenience { min-height: 58px; display: flex; align-items: center; gap: 7px; padding: 9px 12px; border-top: 1px solid #273753; background: #111c31; }
  .video-convenience button,
  .video-convenience select,
  .video-shortcuts summary { min-height: 36px; display: inline-flex; align-items: center; gap: 7px; padding: 0 10px; border: 1px solid #34435f; border-radius: 8px 8px 3px 8px; color: #c9d2e1; background: #17243d; cursor: pointer; font-size: 10px; font-weight: 750; }
  .video-convenience button:hover,
  .video-shortcuts summary:hover { border-color: #7769b2; color: #fff; }
  .video-convenience label { display: inline-flex; align-items: center; gap: 7px; margin-left: auto; color: #8f9cb1; font-size: 10px; }
  .video-convenience select { padding-right: 24px; }
  .video-shortcuts { position: relative; }
  .video-shortcuts summary { min-width: 36px; justify-content: center; list-style: none; font-size: 12px; }
  .video-shortcuts summary::-webkit-details-marker { display: none; }
  .video-shortcuts p { position: absolute; z-index: 5; width: 290px; right: 0; top: calc(100% + 9px); margin: 0; padding: 13px; border: 1px solid #3c4a65; border-radius: 10px; color: #b7c1d2; background: #0d172a; box-shadow: 0 18px 45px rgba(0,0,0,.35); font-size: 10px; line-height: 1.8; }
  .video-progress-form { display: none; }
  .video-chapters { border-top: 1px solid #273753; }
  .video-chapters > summary { min-height: 46px; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 0 17px; cursor: pointer; list-style: none; color: #8290a8; font: 600 8px var(--font-utility); letter-spacing: .12em; text-transform: uppercase; }
  .video-chapters > summary::-webkit-details-marker { display: none; }
  .video-chapters > summary > span:last-child { color: #a795ff; font-size: 14px; transition: transform 160ms ease; }
  .video-chapters[open] > summary > span:last-child { transform: rotate(45deg); }
  .video-chapters nav { padding: 2px 17px 15px; }
  .video-chapters ol { display: flex; flex-wrap: wrap; gap: 7px; margin: 0; padding: 0; list-style: none; }
  .video-chapters button { min-height: 35px; display: flex; align-items: center; gap: 8px; padding: 0 10px; border: 1px solid #32415d; border-radius: 8px 8px 3px 8px; color: #c0cad9; background: #152139; cursor: pointer; font-size: 10px; }
  .video-chapters button:hover { border-color: #7c6cca; color: #fff; }
  .video-chapters button > span { color: #8fe6c7; font: 500 8px var(--font-utility); }

  .study-dock { margin-top: 30px; padding-top: 30px; border-top: 1px solid var(--player-line); }
  .study-dock-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 16px; }
  .study-dock-heading h2 { margin: 7px 0 0; color: #fff; font-size: 25px; }
  .study-dock-heading p { max-width: 320px; margin: 0; color: #8f9bb0; text-align: right; font-size: 11px; }
  .study-dock-tabs { position: relative; }
  .study-dock-radio { position: absolute; width: 1px; height: 1px; overflow: hidden; opacity: 0; }
  .study-dock-tablist { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 12px; }
  .study-dock-tab {
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    padding: 0 14px;
    border: 1px solid var(--player-line);
    border-radius: 10px 10px 3px 10px;
    color: #aeb9cb;
    background: rgba(255, 255, 255, .02);
    cursor: pointer;
    font-size: 11px;
    font-weight: 750;
  }
  .study-dock-tab:hover { border-color: #786cae; color: #fff; }
  #study-tab-transcript:checked ~ .study-dock-tablist [for="study-tab-transcript"],
  #study-tab-note:checked ~ .study-dock-tablist [for="study-tab-note"],
  #study-tab-files:checked ~ .study-dock-tablist [for="study-tab-files"] { border-color: #8d7ae4; color: #fff; background: #2a2450; box-shadow: inset 3px 0 0 #8d7ae4; }
  #study-tab-transcript:focus-visible ~ .study-dock-tablist [for="study-tab-transcript"],
  #study-tab-note:focus-visible ~ .study-dock-tablist [for="study-tab-note"],
  #study-tab-files:focus-visible ~ .study-dock-tablist [for="study-tab-files"] { outline: 3px solid #8f7aff; outline-offset: 2px; }
  .study-dock-panels > * { display: none; }
  #study-tab-transcript:checked ~ .study-dock-panels > .transcript-panel,
  #study-tab-note:checked ~ .study-dock-panels > .note-panel,
  #study-tab-files:checked ~ .study-dock-panels > .resource-panel { display: block; }
  .transcript-panel,
  .note-panel,
  .resource-panel { min-width: 0; border: 1px solid var(--player-line); border-radius: 15px 15px 5px 15px; background: #121d33; }
  .transcript-panel { overflow: hidden; }
  .transcript-panel > summary { display: none; }
  .transcript-panel > summary::-webkit-details-marker { display: none; }
  .transcript-panel > summary strong,
  .transcript-panel > summary small { display: block; }
  .transcript-panel > summary strong { color: #fff; font-size: 13px; }
  .transcript-panel > summary small { margin-top: 2px; color: #8996ab; font: 500 8px var(--font-utility); text-transform: uppercase; }
  .transcript-panel > summary > span:last-child { color: #a795ff; font-size: 18px; transition: transform 160ms ease; }
  .transcript-panel[open] > summary > span:last-child { transform: rotate(45deg); }
  .transcript-tools { display: grid; grid-template-columns: 1fr auto; gap: 7px 12px; padding: 14px 18px; border-top: 1px solid #273753; border-bottom: 1px solid #273753; background: #0f192d; }
  .transcript-tools label { grid-column: 1 / -1; color: #98a5b9; font-size: 12px; font-weight: 750; }
  .transcript-tools input { min-width: 0; min-height: 44px; padding: 0 14px; border: 1px solid #3b4a67; border-radius: 9px; color: #fff; background: #111c31; font-size: 14px; }
  .transcript-tools input:focus { border-color: #8e79ed; outline: 3px solid rgba(143,122,255,.16); }
  .transcript-tools > span { align-self: center; color: #7f8da3; font-size: 11px; }
  .transcript-body { max-height: 430px; overflow-y: auto; padding: 22px 24px; color: #c4cddd; font-size: 15px; line-height: 1.85; scrollbar-width: thin; scrollbar-color: #465776 transparent; }
  .transcript-body p { margin: 0 0 14px; }
  .transcript-body p:last-child { margin-bottom: 0; }
  .transcript-body p[hidden] { display: none; }
  .transcript-empty { margin: 0; padding: 18px 22px; color: #f3cf85; font-size: 13px; }

  .note-panel,
  .resource-panel { padding: 20px; }
  .note-panel-heading,
  .resource-panel-heading { display: flex; align-items: start; justify-content: space-between; gap: 12px; }
  .note-panel-heading strong,
  .note-panel-heading small,
  .resource-panel-heading strong,
  .resource-panel-heading small { display: block; }
  .note-panel-heading strong,
  .resource-panel-heading strong { color: #fff; font-size: 15px; }
  .note-panel-heading small,
  .resource-panel-heading small { margin-top: 3px; color: #8491a7; font-size: 11px; }
  .note-panel-heading > span { color: #a997ff; font-size: 18px; }
  .note-panel form { display: grid; gap: 10px; margin-top: 15px; }
  .note-panel label { color: #9ca9bc; font-size: 12px; font-weight: 750; }
  .note-panel textarea { width: 100%; resize: vertical; min-height: 132px; padding: 13px 14px; border: 1px solid #3a4965; border-radius: 10px 10px 3px 10px; color: #edf1f7; background: #0d172a; font: 15px/1.7 var(--font-body); }
  .note-panel textarea::placeholder { color: #66758d; }
  .note-panel textarea:focus { border-color: #8e7aeb; outline: 3px solid rgba(143,122,255,.16); }
  .note-actions { display: grid; grid-template-columns: minmax(0, 1fr) auto; grid-template-rows: 18px auto; align-items: center; gap: 2px 10px; }
  .note-actions .button { grid-column: 2; grid-row: 2; min-height: 42px; padding-inline: 15px; font-size: 12px; }
  .note-actions [data-form-status] { grid-column: 2; grid-row: 1; min-height: 18px; justify-self: end; color: #9be8cd; font-size: 11px; font-weight: 700; line-height: 1.35; text-align: right; }
  .note-actions [data-form-status]:empty { visibility: hidden; }
  .note-signin { margin-top: 14px; padding-top: 13px; border-top: 1px solid #2b3954; }
  .note-signin p { margin: 0 0 8px; color: #95a1b5; font-size: 13px; line-height: 1.6; }
  .note-signin a { color: #c8bcff; font-size: 12px; font-weight: 750; }

  .resource-panel ul { display: grid; gap: 8px; margin: 14px 0 0; padding: 0; list-style: none; }
  .resource-panel li a { min-height: 56px; display: grid; grid-template-columns: 25px 1fr; align-items: center; gap: 10px; padding: 9px 12px; border: 1px solid #33425d; border-radius: 9px 9px 3px 9px; color: #cbd3e0; background: #101a2d; }
  .resource-panel li a:hover { border-color: #7163ab; color: #fff; }
  .resource-panel li a > span:first-child { color: #9d8df3; }
  .resource-panel li strong,
  .resource-panel li small { display: block; }
  .resource-panel li strong { font-size: 13px; }
  .resource-panel li small { margin-top: 2px; color: #7f8ca1; font: 500 10px var(--font-utility); text-transform: uppercase; }
  .resource-empty { margin: 14px 0 0; padding: 15px; border: 1px dashed #3a4862; border-radius: 9px; color: #8693a7; font-size: 13px; }

  .completion-gate { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 0 13px; border: 1px dashed #495773; border-radius: 10px; color: #9aa7bb; font-size: 10px; font-weight: 700; }
  .completion-gate > span { color: var(--sun); }

  /* The end of a lesson is the final line of the solution trail, not a generic pager. */
  .lesson-progress-dock {
    position: relative;
    overflow: hidden;
    display: grid;
    grid-template-columns: minmax(210px, .72fr) minmax(0, 1.48fr);
    align-items: stretch;
    gap: 0;
    margin-top: 38px;
    padding: 0;
    border: 1px solid var(--player-line);
    border-radius: 18px 18px 6px 18px;
    background: var(--navy-soft);
    box-shadow: 0 18px 48px rgba(8, 16, 30, .09);
  }
  .lesson-progress-dock::before {
    content: "";
    position: absolute;
    z-index: 2;
    inset: 0 auto 0 0;
    width: 4px;
    background: var(--brand);
  }
  .lesson-progress-dock.is-complete::before { background: var(--success); }
  .lesson-progress-back {
    min-width: 0;
    display: flex;
    align-items: center;
    padding: 25px 27px;
    border-right: 1px solid var(--player-line);
    background: color-mix(in srgb, var(--navy-raised) 48%, transparent);
  }
  .lesson-progress-back .lesson-nav-link { width: 100%; }
  .lesson-progress-origin { min-width: 0; display: grid; grid-template-columns: 36px 1fr; align-items: center; gap: 2px 11px; color: var(--player-muted); }
  .lesson-progress-origin > span { grid-row: 1 / 3; width: 36px; height: 36px; display: grid; place-items: center; border: 1px solid var(--player-line); border-radius: 10px 10px 3px 10px; color: var(--brand); font: 800 9px var(--font-utility); }
  .lesson-progress-origin small,
  .lesson-progress-origin strong { min-width: 0; display: block; }
  .lesson-progress-origin small { font: 650 8px var(--font-utility); letter-spacing: .1em; text-transform: uppercase; }
  .lesson-progress-origin strong { overflow: hidden; color: var(--player-text); font-size: 11px; text-overflow: ellipsis; white-space: nowrap; }
  .lesson-progress-next { min-width: 0; display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 26px; padding: 23px 25px 23px 29px; }
  .lesson-progress-copy { min-width: 0; display: grid; gap: 4px; }
  .lesson-progress-copy > strong { overflow: hidden; color: var(--player-text); font-family: var(--font-display); font-size: clamp(18px, 2vw, 23px); line-height: 1.15; letter-spacing: -.025em; text-overflow: ellipsis; white-space: nowrap; }
  .lesson-progress-copy > small { color: var(--player-muted); font-size: 10px; line-height: 1.45; }
  .lesson-progress-kicker { color: var(--brand); font: 750 8px var(--font-utility); letter-spacing: .14em; text-transform: uppercase; }
  .lesson-progress-kicker.is-complete { color: var(--success); }
  .lesson-progress-action { min-width: max-content; }
  .lesson-progress-action form { margin: 0; }
  .lesson-progress-action .button { min-height: 52px; border-radius: 11px 11px 4px 11px; white-space: nowrap; }
  .lesson-progress-return { border: 1px solid var(--player-line); color: var(--player-text); background: transparent; box-shadow: none; }
  .lesson-progress-return:hover { border-color: var(--brand); color: var(--brand); background: var(--navy-raised); box-shadow: none; }
  .lesson-progress-gate-link { min-height: 44px; display: inline-flex; align-items: center; gap: 8px; color: #b9aaff; font-size: 11px; font-weight: 750; text-decoration: underline; text-underline-offset: 3px; }
  .lesson-progress-gate-link:hover { color: #fff; }
  [data-lesson-completion-submit][disabled] { cursor: wait; opacity: .72; }

  .mobile-lesson-action { display: none; }

  /* Course page: show the player promise before the curriculum. */
  .course-messages { width: min(100%, 620px); display: grid; gap: 8px; margin-top: 18px; }
  .course-message { margin: 0; padding: 11px 13px; border: 1px solid rgba(255,255,255,.18); border-radius: 10px 10px 3px 10px; color: #e6ecf4; background: rgba(4, 8, 21, .32); font-size: 11px; }
  .course-message-success { border-color: rgba(91, 220, 174, .42); color: #d3f8ea; background: rgba(22, 122, 88, .24); }
  .course-message-error { border-color: rgba(243, 127, 141, .4); color: #ffe0e5; background: rgba(154, 40, 57, .24); }
  .course-completion-summary { width: min(100%, 680px); display: grid; grid-template-columns: 54px minmax(0, 1fr) auto; align-items: center; gap: 17px; margin-top: 23px; padding: 18px; border: 1px solid rgba(105, 226, 183, .38); border-radius: 20px 20px 7px 20px; background: linear-gradient(120deg, rgba(22, 126, 90, .27), rgba(4, 8, 21, .34)); box-shadow: 0 20px 55px rgba(0,0,0,.17); }
  .course-completion-mark { width: 54px; height: 54px; display: grid; place-items: center; border: 1px solid rgba(131, 236, 198, .34); border-radius: 14px 14px 5px 14px; color: #092f25; background: #75dfba; font-size: 22px; font-weight: 900; }
  .course-completion-summary small,
  .course-completion-summary strong { display: block; }
  .course-completion-summary small { color: #8fe5c7; font: 700 8px var(--font-utility); letter-spacing: .13em; }
  .course-completion-summary strong { margin-top: 4px; color: #fff; font-family: var(--font-display); font-size: 21px; letter-spacing: -.02em; }
  .course-completion-summary p { margin: 4px 0 0; color: #b7c7d3; font-size: 10px; }
  .course-completion-summary .button { min-height: 46px; padding-inline: 16px; white-space: nowrap; }
  .course-resume { width: min(100%, 620px); display: grid; grid-template-columns: 1fr auto; gap: 8px 18px; margin-top: 22px; padding: 15px 17px; border: 1px solid rgba(255,255,255,.15); border-radius: 16px 16px 5px 16px; background: rgba(4, 8, 21, .3); }
  .course-resume > div { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
  .course-resume span { color: #aab5c8; font: 500 9px var(--font-utility); letter-spacing: .08em; text-transform: uppercase; }
  .course-resume strong { color: #fff; font-size: 11px; }
  .course-resume progress { width: 120px; align-self: center; }
  .course-resume small { grid-column: 1 / -1; color: #929fb4; font-size: 9px; }
  .course-experience-strip { border-bottom: 1px solid #ddddea; background: #f1f0f6; }
  .course-experience-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
  .course-experience-grid > div { min-height: 176px; display: grid; grid-template-columns: 34px 1fr; align-content: center; column-gap: 14px; padding: 30px 36px; border-left: 1px solid #d9d8e5; }
  .course-experience-grid > div:last-child { border-right: 1px solid #d9d8e5; }
  .course-experience-grid > div > span { grid-row: 1 / 3; color: var(--brand-dark); font: 600 10px var(--font-utility); }
  .course-experience-grid strong { color: var(--ink); font-family: var(--font-display); font-size: 17px; letter-spacing: -.025em; }
  .course-experience-grid p { margin: 5px 0 0; color: var(--muted); font-size: 11px; line-height: 1.6; }

  /* Bezpłatny start: one continuous solution trail instead of three generic cards. */
  .free-start-reassurance {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 14px 0 0 !important;
    color: #b8c5d3 !important;
    font-size: 12px !important;
  }
  .free-start-reassurance > span { color: var(--mint); font-weight: 900; }
  .free-start-proof {
    isolation: isolate;
    justify-content: flex-start;
    gap: 26px;
    padding: 38px;
    background:
      radial-gradient(circle at 85% 8%, rgba(67, 215, 165, .18), transparent 29%),
      linear-gradient(155deg, color-mix(in srgb, var(--course-accent) 72%, #151a34), #10162b 82%);
  }
  .free-start-proof::after { display: none; }
  .free-start-proof ol {
    position: relative;
    z-index: 2;
    display: grid;
    gap: 0;
    margin: 8px 0 0;
    padding: 0;
    list-style: none;
  }
  .free-start-proof ol::before {
    content: "";
    position: absolute;
    top: 24px;
    bottom: 24px;
    left: 22px;
    width: 2px;
    background: linear-gradient(var(--mint), color-mix(in srgb, var(--mint) 28%, transparent));
    box-shadow: 0 0 24px rgba(67, 215, 165, .28);
  }
  .free-start-proof li {
    position: relative;
    display: grid;
    grid-template-columns: 46px minmax(0, 1fr);
    gap: 17px;
    padding: 15px 0 21px;
  }
  .free-start-proof li > span {
    position: relative;
    z-index: 2;
    width: 46px;
    height: 46px;
    display: grid;
    place-items: center;
    border: 1px solid rgba(255,255,255,.22);
    border-radius: 13px 13px 4px 13px;
    color: #082a21;
    background: var(--mint);
    font: 700 11px var(--font-utility);
  }
  .free-start-proof li small,
  .free-start-proof li strong,
  .free-start-proof li p { display: block; }
  .free-start-proof li small { color: #8ee8c8; font: 600 10px/1.4 var(--font-utility); letter-spacing: .06em; }
  .free-start-proof li strong { margin-top: 5px; color: #fff; font: 700 20px/1.2 var(--font-display); }
  .free-start-proof li p { margin: 6px 0 0; color: #aebbd0; font-size: 12px; line-height: 1.55; }
  .free-start-proof-note {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    gap: 9px;
    margin: auto 0 0;
    padding-top: 18px;
    border-top: 1px solid rgba(255,255,255,.13);
    color: #d6ddec;
    font-size: 12px;
  }
  .free-start-proof-note > span { color: var(--mint); font-size: 18px; }
  .free-start-account-note { margin-top: 28px; padding-top: 19px; border-top: 1px solid var(--line); font-size: 12px !important; }
  .free-start-account-note a { color: var(--brand-dark); font-weight: 760; }
  .module-lessons .lesson-locked {
    min-height: 82px;
    display: grid;
    grid-template-columns: 38px minmax(0, 1fr) auto;
    align-items: center;
    gap: 15px;
    color: #7b7e90;
  }
  .module-lessons .lesson-locked strong,
  .module-lessons .lesson-locked small { display: block; }
  .module-lessons .lesson-locked strong { color: #55586c; font-size: 14px; }
  .module-lessons .lesson-locked small { margin-top: 3px; color: #5f6274; font-size: 12px; }
  .module-lessons .lesson-locked > span:last-child { max-width: 150px; color: #6c618f; font: 600 10px/1.4 var(--font-utility); text-align: right; text-transform: uppercase; }

  .free-start-value-gate,
  .free-start-completion {
    position: relative;
    overflow: hidden;
    display: grid;
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 28px;
    margin: 38px 0;
    padding: 30px;
    border: 1px solid var(--studio-line);
    border-radius: 20px 20px 7px 20px;
    color: var(--studio-text);
    background: var(--studio-surface);
    box-shadow: var(--studio-shadow);
  }
  .free-start-value-gate::before,
  .free-start-completion::before {
    content: "";
    position: absolute;
    inset: 0 auto 0 0;
    width: 4px;
    background: var(--studio-action);
  }
  .free-start-gate-mark,
  .free-start-completion-score {
    min-height: 112px;
    display: grid;
    place-items: center;
    align-content: center;
    gap: 7px;
    border-radius: 16px 16px 5px 16px;
    color: var(--studio-action-hover);
    background: var(--studio-selected);
  }
  .free-start-gate-mark span,
  .free-start-completion-score span { font: 750 31px/1 var(--font-display); }
  .free-start-gate-mark i,
  .free-start-completion-score i { font-style: normal; font-size: 15px; }
  .free-start-gate-copy h2,
  .free-start-completion h2 { margin: 9px 0 8px; color: var(--studio-text); font-size: clamp(26px, 3vw, 38px); }
  .free-start-gate-copy > p,
  .free-start-completion > div:last-child > p { margin: 0; color: var(--studio-muted); font-size: calc(14px * var(--course-reading-scale)); line-height: 1.72; }
  .free-start-gate-actions,
  .free-start-completion-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 16px; margin-top: 20px; }
  .free-start-gate-actions a,
  .free-start-completion-actions > a:not(.button) { color: var(--studio-action); font-size: 12px; font-weight: 760; text-decoration: underline; text-underline-offset: 4px; }
  .free-start-gate-copy > small,
  .free-start-completion > div:last-child > small { display: block; margin-top: 14px; color: var(--studio-muted); font-size: 11px; line-height: 1.55; }
  .free-start-completion { border-color: var(--studio-success); }
  .free-start-completion::before { background: var(--studio-success); }
  .free-start-completion-score { color: var(--studio-success-text); background: var(--studio-success-bg); }
  .free-start-player-progress progress { width: 116px; }

  @media (max-width: 1040px) {
    .player-header { grid-template-columns: auto minmax(120px, 1fr) auto auto; }
    .lesson-heading { gap: 22px; }
    .question-trail-label { display: none; }
    .course-experience-grid > div { padding-inline: 22px; }
  }

  @media (max-width: 860px) {
    .player-header { grid-template-columns: minmax(0, 1fr) auto auto; }
    .focus-mode .lesson-content { width: min(calc(100% - 36px), 760px); }
    /* Tap targets co najmniej 44px na ekranach dotykowych. */
    .video-convenience button,
    .video-convenience select { min-height: 44px; }
    .outline-close { width: 44px; height: 44px; }
    .question-step { width: 44px; height: 44px; }
    .outline-back { display: flex; align-items: center; min-height: 44px; }
    .outline-toggle { min-height: 44px; }
    .quiz-result { grid-template-columns: 180px minmax(0, 1fr); }
    .course-experience-grid { grid-template-columns: 1fr; padding-block: 7px; }
    .course-experience-grid > div { min-height: 112px; border-right: 1px solid #d9d8e5; border-bottom: 1px solid #d9d8e5; }
    .course-experience-grid > div:last-child { border-bottom: 0; }
    .free-start-value-gate,
    .free-start-completion { grid-template-columns: 88px minmax(0, 1fr); gap: 20px; padding: 24px; }
    .free-start-gate-mark,
    .free-start-completion-score { min-height: 88px; }
    .course-completion-summary { grid-template-columns: 54px minmax(0, 1fr); }
    .course-completion-summary .button { grid-column: 1 / -1; width: 100%; }
    .lesson-progress-dock { grid-template-columns: minmax(180px, .62fr) minmax(0, 1.38fr); }
    .lesson-progress-next { grid-template-columns: 1fr; gap: 15px; }
    .lesson-progress-action { min-width: 0; }
    .lesson-progress-action form,
    .lesson-progress-action .button { width: 100%; }
  }

  @media (max-width: 640px) {
    html:has(body.player-page) { scroll-padding-bottom: calc(86px + env(safe-area-inset-bottom)); }
    .player-page > main { padding-bottom: 76px; }
    .brand-player > span:last-child { display: none; }
    .player-header { gap: 7px; padding-inline: 12px; }
    .outline-toggle { min-width: 44px; min-height: 44px; padding-inline: 9px; font-size: 10px; }
    .lesson-content,
    .focus-mode .lesson-content { width: min(calc(100% - 28px), 760px); padding-top: 37px; }
    .lesson-heading { margin-bottom: 28px; }
    .lesson-heading h1 { font-size: clamp(34px, 11vw, 44px); }
    .lesson-heading-tools { margin-top: 18px; }
    .lesson-heading-tools .lesson-duration { order: 3; }
    .question-trail { padding-inline: 10px; }
    .question-trail ol { gap: 6px; overflow-x: auto; padding: 4px; scrollbar-width: none; }
    .question-trail ol::-webkit-scrollbar { display: none; }
    .question-step { width: 44px; height: 44px; }
    .question-trail-count { padding-right: 2px; }
    .exercise-topline { min-height: 56px; align-items: flex-start; flex-direction: column; justify-content: center; gap: 2px; }
    .exercise-form legend { font-size: 21px; }
    .answer-option .answer-index { display: grid; }
    .answer-option { min-height: 62px; gap: 10px; padding-inline: 12px; }
    .answer-option > span:last-child { font-size: 13px; }
    .exercise-actions > span { text-align: center; }
    .question-navigation { padding-inline: 0; }
    .question-navigation a { font-size: 10px; }
    .quiz-result { grid-template-columns: 1fr; }
    .quiz-result-score { grid-template-columns: 1fr auto; align-items: end; padding: 24px; border-right: 0; border-bottom: 1px solid #33415e; }
    .quiz-result-score > span { grid-column: 1 / -1; }
    .quiz-result-score strong { font-size: 43px; }
    .quiz-result-score progress { width: 100%; margin-bottom: 7px; }
    .quiz-result-copy { padding: 25px 24px; }
    .video-convenience { flex-wrap: wrap; }
    .video-convenience label { margin-left: 0; }
    .video-shortcuts { margin-left: auto; }
    .video-shortcuts p { position: fixed; z-index: 90; left: 14px; right: 14px; bottom: 78px; top: auto; width: auto; }
    .video-chapters nav { padding-bottom: 13px; }
    .video-caption-strip { min-height: 58px; padding: 9px 12px 11px; font-size: 14px; line-height: 1.35; }
    .study-dock-heading { align-items: start; flex-direction: column; gap: 8px; }
    .study-dock-heading p { text-align: left; }
    .study-dock-tablist { margin-bottom: 9px; }
    .transcript-tools { grid-template-columns: 1fr; }
    .transcript-tools label { grid-column: auto; }
    .note-panel,
    .resource-panel { padding: 16px; }
    .lesson-progress-dock { grid-template-columns: 1fr; padding: 0; border-radius: 16px 16px 5px 16px; }
    .lesson-progress-back { min-height: 70px; padding: 16px 18px; border-right: 0; border-bottom: 1px solid var(--player-line); }
    .lesson-progress-next { grid-template-columns: 1fr; gap: 17px; padding: 21px 18px 19px; }
    .lesson-progress-copy > strong { white-space: normal; }
    .lesson-progress-action,
    .lesson-progress-action form,
    .lesson-progress-action .button { width: 100%; }
    .mobile-lesson-action { position: fixed; z-index: 45; left: 0; right: 0; bottom: 0; min-height: 70px; display: grid; place-items: center; padding: 9px 14px calc(9px + env(safe-area-inset-bottom)); border-top: 1px solid #2c3a55; background: rgba(8, 13, 29, .94); backdrop-filter: blur(16px); transition: transform 180ms ease, opacity 180ms ease; }
    .mobile-lesson-action:empty { display: none; }
    .mobile-lesson-action form,
    .mobile-lesson-action .button { width: 100%; }
    .mobile-lesson-action .button { min-height: 50px; }
    .lesson-dock-in-view .mobile-lesson-action,
    .lesson-focus-near-action .mobile-lesson-action,
    .quiz-action-in-view .mobile-lesson-action,
    .angelika-help-open .mobile-lesson-action { opacity: 0; pointer-events: none; transform: translateY(110%); }
    .course-resume { grid-template-columns: 1fr; }
    .course-completion-summary { grid-template-columns: 46px minmax(0, 1fr); padding: 15px; }
    .course-completion-mark { width: 46px; height: 46px; }
    .course-resume progress { width: 100%; }
    .course-resume small { grid-column: auto; }
    .course-experience-grid > div { grid-template-columns: 28px 1fr; padding: 22px 17px; }
    .course-facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); width: 100%; }
    .course-facts > div { min-width: 0; padding: 9px 13px; }
    .course-facts > div:nth-child(3) { grid-column: 1 / -1; border-top: 1px solid rgba(255,255,255,.15); }
    .course-facts dd { font-size: 12px; }
    .free-start-proof { min-height: 430px; padding: 29px; }
    .module-lessons .lesson-locked { grid-template-columns: 35px minmax(0, 1fr); padding-block: 14px; }
    .module-lessons .lesson-locked > span:last-child { grid-column: 2; max-width: none; text-align: left; }
    .free-start-value-gate,
    .free-start-completion { grid-template-columns: 1fr; gap: 17px; margin-block: 28px; padding: 21px 19px; }
    .free-start-gate-mark,
    .free-start-completion-score { width: 82px; min-height: 72px; }
    .free-start-gate-actions,
    .free-start-completion-actions { align-items: stretch; flex-direction: column; }
    .free-start-gate-actions form,
    .free-start-gate-actions .button,
    .free-start-completion-actions .button { width: 100%; }
    .free-start-gate-actions a,
    .free-start-completion-actions > a:not(.button) { min-height: 44px; display: inline-flex; align-items: center; }
  }

  @media (max-width: 380px) {
    .outline-toggle { padding-inline: 10px; }
    .outline-toggle .outline-toggle-count { display: none; }
    .lesson-heading-tools { display: grid; grid-template-columns: 1fr 1fr; }
    .lesson-heading-tools form { width: 100%; }
    .bookmark-button { width: 100%; justify-content: center; }
    .lesson-status { justify-content: center; }
    .lesson-heading-tools .lesson-duration { grid-column: 1 / -1; width: max-content; }
    .question-trail-count { display: none; }
    .video-convenience [data-transcript-toggle] { display: none; }
  }

  @media (prefers-reduced-motion: reduce) {
    .outline-modules a,
    .answer-option,
    .question-step { transform: none !important; }
  }
}

@layer app-premium {
  .angelika-help {
    clear: both;
    margin: 0 0 25px;
    overflow: hidden;
    border: 1px solid var(--studio-line, #c9d8d5);
    border-radius: 14px 14px 4px 14px;
    color: var(--studio-text, #172d2d);
    background: var(--studio-surface-raised, #f9fbfb);
  }

  .angelika-help > summary {
    min-height: 64px;
    display: grid;
    grid-template-columns: 38px minmax(0, 1fr) auto;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    cursor: pointer;
    list-style: none;
  }
  .angelika-help > summary::-webkit-details-marker,
  .angelika-help-steps summary::-webkit-details-marker { display: none; }
  .angelika-help > summary:hover { background: var(--studio-selected, #d5ebe6); }
  .angelika-help-mark {
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border-radius: 11px 11px 3px 11px;
    color: var(--studio-on-action, #fff);
    background: var(--studio-action, #0b6b65);
    font: italic 750 21px/1 "Bitstream Charter", Georgia, serif;
  }
  .angelika-help > summary strong,
  .angelika-help > summary small { display: block; }
  .angelika-help > summary strong { color: var(--studio-text, #172d2d); font-size: 12px; }
  .angelika-help > summary small { margin-top: 2px; color: var(--studio-muted, #506563); font-size: 9px; }
  .angelika-help > summary > i { color: var(--studio-action, #0b6b65); font-style: normal; transition: transform 160ms ease; }
  .angelika-help[open] > summary > i { transform: rotate(180deg); }

  .angelika-help-intro { padding: 14px 15px; border-block: 1px solid var(--studio-line, #c9d8d5); background: var(--studio-surface-muted, #e5efed); }
  .angelika-help-intro p { max-width: 660px; margin: 0; color: var(--studio-muted, #506563); font-size: 10px; line-height: 1.6; }
  .angelika-help-steps { padding: 0 15px 8px; }
  .angelika-help-steps > details { border-bottom: 1px solid var(--studio-line, #c9d8d5); }
  .angelika-help-steps > details:last-child { border-bottom: 0; }
  .angelika-help-steps summary {
    min-height: 48px;
    display: grid;
    grid-template-columns: 27px minmax(0, 1fr) auto;
    align-items: center;
    gap: 9px;
    cursor: pointer;
    list-style: none;
  }
  .angelika-help-steps summary > span { color: var(--studio-action, #0b6b65); font: 700 8px/1 var(--font-utility); letter-spacing: .06em; }
  .angelika-help-steps summary > strong { color: var(--studio-text, #172d2d); font-size: 10px; }
  .angelika-help-steps summary > i { width: 23px; height: 23px; display: grid; place-items: center; border: 1px solid var(--studio-line, #c9d8d5); border-radius: 7px 7px 2px 7px; color: var(--studio-action, #0b6b65); background: var(--studio-surface, #fff); font-style: normal; }
  .angelika-help-steps details[open] summary > i { color: var(--studio-on-action, #fff); background: var(--studio-action, #0b6b65); transform: rotate(45deg); }
  .angelika-help-steps details > p {
    margin: 0 0 14px 36px;
    padding: 12px 14px;
    border-left: 2px solid var(--studio-action, #0b6b65);
    color: var(--studio-text, #172d2d);
    background: var(--studio-selected, #d5ebe6);
    font-size: calc(13px * var(--course-reading-scale, 1));
    line-height: 1.65;
  }
  .angelika-help-steps .is-trap summary > span,
  .angelika-help-steps .is-trap summary > strong { color: var(--studio-warning-text, #5a3c00); }
  .angelika-help-steps .is-trap details > p,
  .angelika-help-steps .is-trap > p { border-color: var(--studio-warning, #765000); background: var(--studio-warning-bg, #f8efcf); }
  .angelika-help-steps .is-solution { margin-inline: -15px; padding-inline: 15px; background: color-mix(in srgb, var(--studio-action, #0b6b65) 5%, transparent); }
  .angelika-help-steps .is-solution summary > strong { color: var(--studio-action-hover, #07504d); }

  .feedback-recovery-note { display: block; margin-top: 8px; font-size: 10px; font-weight: 700; }
  .quiz-radar-link { min-height: 36px; display: inline-flex; align-items: center; gap: 7px; margin-top: 10px; color: var(--studio-action, #0b6b65); font-size: 10px; font-weight: 800; text-decoration: underline; text-underline-offset: 3px; }
  .quiz-radar-link:hover { color: var(--studio-action-hover, #07504d); }

  @media (max-width: 640px) {
    .angelika-help > summary { grid-template-columns: 36px minmax(0, 1fr) auto; padding-inline: 11px; }
    .angelika-help-mark { width: 36px; height: 36px; }
    .angelika-help-steps { padding-inline: 11px; }
    .angelika-help-steps details > p { margin-left: 0; }
    .angelika-help-steps .is-solution { margin-inline: -11px; padding-inline: 11px; }
  }
}

/* Passwordless access — one calm doorway shared by first visits and returns. */
@layer app-premium {
  .auth-page {
    --auth-ink: #17302e;
    --auth-muted: #5d706d;
    --auth-line: #c9d8d5;
    --auth-canvas: #eef4f2;
    --auth-paper: #ffffff;
    --auth-soft: #e4eeeb;
    --auth-action: #0b6b65;
    --auth-action-hover: #07534f;
    --ring: 0 0 0 4px color-mix(in srgb, var(--auth-action) 16%, transparent);
    color: var(--auth-ink);
    background: var(--auth-canvas);
  }

  .auth-page .site-header,
  .auth-page .site-footer { background: var(--auth-paper); }
  .auth-page .site-footer,
  .auth-page .site-footer .footer-brand p,
  .auth-page .site-footer .footer-note { color: #4c625f; }
  .auth-page .site-footer .brand-footer,
  .auth-page .site-footer .footer-col strong { color: var(--auth-ink); }
  .auth-page .site-footer .footer-col a,
  .auth-page .site-footer .footer-brand > a:not(.brand) { color: var(--auth-action-hover); }
  .auth-page .site-footer .footer-col a:hover,
  .auth-page .site-footer .footer-brand > a:not(.brand):hover { color: #063f3c; }
  .auth-page .site-footer .footer-bottom { border-top-color: var(--auth-line); }
  .auth-page .brand-mark { background: var(--auth-action); box-shadow: 0 9px 22px rgba(11, 107, 101, .18); }
  .auth-page .header-cta { border-color: var(--auth-action); background: var(--auth-action); box-shadow: 0 11px 24px rgba(11, 107, 101, .18); }
  .auth-page .header-cta:hover { border-color: var(--auth-action-hover); background: var(--auth-action-hover); box-shadow: 0 14px 29px rgba(11, 107, 101, .22); }

  .auth-access-section {
    min-height: calc(100vh - 80px);
    display: grid;
    place-items: start center;
    padding: 12px;
    background: var(--auth-canvas);
  }

  .auth-access-shell {
    width: min(100%, 1120px);
    min-height: 0;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "form" "story";
    margin: 0;
    overflow: hidden;
    border: 1px solid var(--auth-line);
    border-radius: 24px 24px 8px 24px;
    background: var(--auth-paper);
    box-shadow: 0 28px 70px rgba(23, 48, 46, .11);
  }

  .auth-access-context {
    grid-area: story;
    min-height: 0;
    display: block;
    padding: 30px 23px;
    border-top: 1px solid var(--auth-line);
    color: var(--auth-ink);
    background: var(--auth-soft);
  }

  .auth-access-seal,
  .auth-access-mobile-seal,
  .auth-status-mark {
    width: 46px;
    height: 46px;
    display: grid;
    place-items: center;
    margin-bottom: 25px;
    border-radius: 14px 14px 4px 14px;
    color: #fff;
    background: var(--auth-action);
    font: italic 750 23px/1 "Bitstream Charter", Georgia, serif;
  }
  .auth-access-context .auth-access-seal { display: none; }

  .auth-access-context .utility-label,
  .auth-access-card .eyebrow { color: var(--auth-action); font: 700 9px/1.25 var(--font-utility); letter-spacing: .12em; }
  .auth-context-photo {
    width: 128px;
    height: 128px;
    display: block;
    margin-bottom: 26px;
    overflow: hidden;
    border: 3px solid #fff;
    border-radius: 22px 22px 8px 22px;
    background: var(--auth-soft);
    box-shadow: 0 16px 38px rgba(23, 48, 46, .16);
    transform: rotate(-2deg);
  }
  .auth-context-photo img { width: 100%; height: 100%; object-fit: cover; object-position: 56% center; }
  .auth-access-context h2 {
    max-width: 440px;
    margin: 13px 0 13px;
    color: var(--auth-ink);
    font-size: clamp(31px, 8vw, 43px);
    letter-spacing: -.05em;
    line-height: 1.03;
  }
  .auth-access-context > p:not(.auth-access-context-note) { max-width: 470px; margin: 0; color: #526864; font-size: 14px; line-height: 1.7; }

  .auth-access-benefits {
    display: grid;
    gap: 0;
    margin: 27px 0 0;
    padding: 0;
    border-block: 1px solid var(--auth-line);
    list-style: none;
  }
  .auth-access-benefits li { min-height: 48px; display: flex; align-items: center; gap: 11px; border-bottom: 1px solid var(--auth-line); }
  .auth-access-benefits li:last-child { border-bottom: 0; }
  .auth-access-benefits li > span { width: 24px; height: 24px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--auth-action); font-size: 11px; }
  .auth-access-benefits strong { color: #29433f; font-size: 12px; }
  .auth-access-context .auth-access-context-note { margin: 24px 0 0; color: #4c6863; font: 650 9px/1.5 var(--font-utility); letter-spacing: .02em; }
  .auth-access-context-note span { padding-inline: 4px; color: var(--auth-action); }

  .auth-access-card-wrap { grid-area: form; display: grid; place-items: center; padding: 39px 22px 42px; }
  .auth-access-card { width: min(100%, 480px); padding: 0; border: 0; border-radius: 0; background: transparent; box-shadow: none; }
  .auth-access-mobile-seal { margin-bottom: 23px; }
  .auth-access-card h1 { max-width: 470px; margin: 14px 0 13px; color: var(--auth-ink); font-size: var(--text-display-lg); letter-spacing: -.05em; line-height: 1.02; }
  .auth-access-card > p,
  .auth-sent > p,
  .auth-confirm > p { max-width: 465px; margin: 0; color: var(--auth-muted); font-size: 14px; line-height: 1.75; }
  .auth-access-card > p.auth-lead { font-size: var(--text-lead); line-height: 1.65; }
  .auth-sent > p strong { color: var(--auth-ink); overflow-wrap: anywhere; }

  .auth-access-form { display: grid; margin: 28px 0 0; }
  .auth-access-form label { display: grid; gap: 4px; margin: 0 0 9px; color: var(--auth-ink); }
  .auth-access-form label > span { font-size: 13px; font-weight: 800; }
  .auth-access-form label > small { color: var(--auth-muted); font-size: 10px; font-weight: 600; }
  .auth-access-form input:not([type="hidden"]) {
    width: 100%;
    min-height: 59px;
    padding: 0 17px;
    border: 1px solid #9eb4af;
    border-radius: 12px 12px 4px 12px;
    color: var(--auth-ink);
    background: #fbfdfc;
    font: 600 16px/1 var(--font-body);
  }
  .auth-access-form input:not([type="hidden"]):hover { border-color: #6e8f88; }
  .auth-access-form input:not([type="hidden"]):focus { border-color: var(--auth-action); outline: 0; box-shadow: var(--ring); }
  .auth-access-form .auth-submit {
    width: 100%;
    min-height: 58px;
    margin-top: 15px;
    border: 1px solid var(--auth-action);
    border-radius: 12px 12px 4px 12px;
    color: #fff;
    background: var(--auth-action);
    box-shadow: 0 14px 30px rgba(11, 107, 101, .19);
    font-size: 14px;
  }
  .auth-access-form .auth-submit:hover { border-color: var(--auth-action-hover); background: var(--auth-action-hover); box-shadow: 0 17px 34px rgba(11, 107, 101, .23); transform: translateY(-1px); }

  .auth-access-assurance {
    display: grid;
    grid-template-columns: 25px minmax(0, 1fr);
    align-items: start;
    gap: 9px;
    margin-top: 19px !important;
    padding-top: 18px;
    border-top: 1px solid var(--auth-line);
    color: var(--auth-muted) !important;
    font-size: 11px !important;
    line-height: 1.65 !important;
  }
  .auth-access-assurance > span { width: 25px; height: 25px; display: grid; place-items: center; border-radius: 50%; color: var(--auth-action); background: var(--auth-soft); font-size: 11px; font-weight: 900; }

  .auth-feedback {
    display: grid;
    gap: 4px;
    margin-top: 20px;
    padding: 14px 15px;
    border: 1px solid #e4aab2;
    border-radius: 11px 11px 4px 11px;
    color: #712733;
    background: #fff1f3;
  }
  .auth-feedback strong { font-size: 12px; }
  .auth-feedback p { margin: 0; font-size: 11px; line-height: 1.55; }
  .auth-access-form .form-error { display: grid; gap: 3px; margin: 8px 0 0; padding: 10px 12px; border: 1px solid #e4aab2; color: #712733; background: #fff1f3; font-size: 11px; }

  .auth-sent { width: 100%; }
  .auth-sent .auth-status-mark { margin-bottom: 24px; font-family: var(--font-body); font-size: 19px; font-style: normal; }
  .auth-link-limits { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 26px; }
  .auth-link-limits > span { min-height: 76px; display: flex; flex-direction: column; justify-content: center; gap: 4px; padding: 13px 15px; border: 1px solid var(--auth-line); border-radius: 12px 12px 4px 12px; color: var(--auth-muted); background: #f8fbfa; font-size: 10px; }
  .auth-link-limits strong { color: var(--auth-action); font-size: 13px; }
  .auth-sent .auth-delivery-note { margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--auth-line); font-size: 11px; line-height: 1.65; }
  .auth-retry-link { min-height: 48px; display: inline-flex; align-items: center; gap: 8px; margin-top: 11px; color: var(--auth-action); font-size: 12px; font-weight: 800; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 4px; }
  .auth-retry-link:hover { color: var(--auth-action-hover); }

  .auth-confirm > p strong { color: var(--auth-ink); overflow-wrap: anywhere; }
  .auth-confirm-form { margin-top: 27px; }
  .auth-confirm-link {
    width: 100%;
    min-height: 58px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-top: 27px;
    border: 1px solid var(--auth-action);
    border-radius: 12px 12px 4px 12px;
    color: #fff;
    background: var(--auth-action);
    box-shadow: 0 14px 30px rgba(11, 107, 101, .19);
    font-size: 14px;
  }
  .auth-confirm-link:hover { border-color: var(--auth-action-hover); color: #fff; background: var(--auth-action-hover); box-shadow: 0 17px 34px rgba(11, 107, 101, .23); transform: translateY(-1px); }
  .auth-confirm-invalid .auth-status-mark { color: #712733; background: #fff1f3; box-shadow: inset 0 0 0 1px #e4aab2; font-family: var(--font-body); font-size: 20px; font-style: normal; }
  .auth-confirm-invalid .eyebrow { color: #8a3240; }

  .auth-access-section :where(a, button, input):focus-visible {
    outline: 3px solid var(--auth-action);
    outline-offset: 3px;
  }

  @media (min-width: 641px) {
    .auth-access-section { place-items: center; padding: 28px; }
    .auth-access-card-wrap { padding: 55px 44px; }
    .auth-access-context { padding: 39px 36px; }
  }

  @media (min-width: 861px) {
    .auth-access-shell {
      min-height: min(650px, calc(100vh - 138px));
      grid-template-columns: minmax(315px, .82fr) minmax(470px, 1.18fr);
      grid-template-areas: "story form";
    }
    .auth-access-context { min-height: 100%; display: flex; flex-direction: column; justify-content: center; padding: clamp(44px, 4.5vw, 64px); border-top: 0; border-right: 1px solid var(--auth-line); }
    .auth-access-context .auth-access-seal { display: grid; }
    .auth-access-context .auth-access-context-note { margin-top: auto; padding-top: 38px; }
    .auth-access-card-wrap { padding: clamp(52px, 5vw, 72px); }
    .auth-access-mobile-seal { display: none; }
  }

  @media (max-width: 420px) {
    .auth-link-limits { grid-template-columns: 1fr; }
    .auth-link-limits > span { min-height: 66px; }
  }

  @media (prefers-reduced-motion: reduce) {
    .auth-access-form .auth-submit:hover { transform: none; }
  }

  @media print {
    body {
      color: #111;
      background: #fff;
      -webkit-print-color-adjust: economy;
      print-color-adjust: economy;
    }

    .skip-link,
    .site-header,
    .site-footer,
    .privacy-corner-button,
    .privacy-banner,
    .privacy-dialog,
    .course-local-nav {
      display: none !important;
    }

    main { min-height: 0; }
  }
}