/*
 * Course appearance presets.
 * Light positive polarity is the no-JavaScript default; the video itself stays
 * dark so media controls and captions keep a stable visual environment.
 */

.player-page {
  --studio-page: #f3f7f6;
  --studio-surface: #fff;
  --studio-surface-muted: #e5efed;
  --studio-surface-raised: #f9fbfb;
  --studio-text: #172d2d;
  --studio-muted: #506563;
  --studio-line: #c9d8d5;
  --studio-control-line: #607a77;
  --studio-action: #0b6b65;
  --studio-action-hover: #07504d;
  --studio-on-action: #fff;
  --studio-selected: #d5ebe6;
  --studio-focus-inner: #fff;
  --studio-focus-outer: #172d2d;
  --studio-success: #146b50;
  --studio-success-bg: #e2f4ed;
  --studio-success-text: #104d3d;
  --studio-error: #a3293a;
  --studio-error-bg: #fbe8eb;
  --studio-error-text: #7b1e2c;
  --studio-warning: #765000;
  --studio-warning-bg: #f8efcf;
  --studio-warning-text: #5a3c00;
  --studio-grid: rgba(23, 45, 45, .035);
  --studio-shadow: 0 22px 56px rgba(29, 60, 58, .09);
  --course-reading-scale: 1;
  --navy: var(--studio-page);
  --navy-soft: var(--studio-surface);
  --navy-raised: var(--studio-surface-muted);
  --player-line: var(--studio-line);
  --player-text: var(--studio-text);
  --player-muted: var(--studio-muted);
  --brand: var(--studio-action) !important;
  --brand-dark: var(--studio-action-hover);
  --mint: var(--studio-action);
  --sun: var(--studio-warning);
  --success: var(--studio-success);
  --error: var(--studio-error);
  --warning: var(--studio-warning);
  color: var(--studio-text);
  color-scheme: light;
  background:
    radial-gradient(circle at 78% 4%, color-mix(in srgb, var(--studio-action) 5%, transparent), transparent 26%),
    var(--studio-page);
}

html[data-course-theme="paper"] .player-page {
  --studio-page: #f8f1e4;
  --studio-surface: #fffdf7;
  --studio-surface-muted: #eee3cf;
  --studio-surface-raised: #fcf8ef;
  --studio-text: #302b24;
  --studio-muted: #665e52;
  --studio-line: #d8cdb9;
  --studio-control-line: #747066;
  --studio-action: #1f626b;
  --studio-action-hover: #154a52;
  --studio-on-action: #fff;
  --studio-selected: #e5e0cc;
  --studio-focus-inner: #fffdf7;
  --studio-focus-outer: #302b24;
  --studio-success: #23664d;
  --studio-success-bg: #e5f0e7;
  --studio-success-text: #194a38;
  --studio-error: #9e3040;
  --studio-error-bg: #f8e5e5;
  --studio-error-text: #752331;
  --studio-warning: #765000;
  --studio-warning-bg: #f2e6bd;
  --studio-warning-text: #574000;
  --studio-grid: rgba(48, 43, 36, .04);
  --studio-shadow: 0 22px 56px rgba(79, 63, 39, .1);
}

html[data-course-theme="dark"] .player-page {
  --studio-page: #10191b;
  --studio-surface: #182427;
  --studio-surface-muted: #223135;
  --studio-surface-raised: #1d2b2e;
  --studio-text: #f2f6f4;
  --studio-muted: #adbeba;
  --studio-line: #33474b;
  --studio-control-line: #81928f;
  --studio-action: #61d2c4;
  --studio-action-hover: #82e6da;
  --studio-on-action: #0b2926;
  --studio-selected: #263c3e;
  --studio-focus-inner: #f2f6f4;
  --studio-focus-outer: #10191b;
  --studio-success: #79ddc4;
  --studio-success-bg: #1b3b36;
  --studio-success-text: #ccf7e8;
  --studio-error: #ff9aaa;
  --studio-error-bg: #40242a;
  --studio-error-text: #ffe1e6;
  --studio-warning: #f2ce82;
  --studio-warning-bg: #3e3420;
  --studio-warning-text: #fff0c9;
  --studio-grid: rgba(242, 246, 244, .025);
  --studio-shadow: 0 25px 65px rgba(0, 0, 0, .26);
  color-scheme: dark;
}

html[data-course-text-size="large"] .player-page { --course-reading-scale: 1.12; }
html[data-course-text-size="xlarge"] .player-page { --course-reading-scale: 1.25; }

/* Header and appearance control */
.player-page .player-header {
  border-color: var(--studio-line);
  background: color-mix(in srgb, var(--studio-surface) 94%, transparent);
  box-shadow: 0 1px 0 color-mix(in srgb, var(--studio-text) 4%, transparent);
}

.player-page .brand-player,
.player-page .breadcrumbs [aria-current="page"] { color: var(--studio-text); }
.player-page .brand-player .brand-mark { color: var(--studio-on-action); background: var(--studio-action); }
.player-page .breadcrumbs,
.player-page .player-progress,
.player-page .player-save-note { color: var(--studio-muted); }
.player-page .breadcrumbs a:hover,
.player-page .player-save-note:hover { color: var(--studio-action-hover); }
.player-page .player-save-note { border-color: var(--studio-line); }

.player-page .outline-toggle {
  border-color: var(--studio-control-line);
  color: var(--studio-text);
  background: var(--studio-surface);
}
.player-page .outline-toggle:hover { border-color: var(--studio-action); }
.player-page .outline-toggle .outline-toggle-icon { color: var(--studio-action); }
.player-page .outline-toggle .outline-toggle-count {
  color: var(--studio-muted);
  background: color-mix(in srgb, var(--studio-text) 8%, transparent);
}

.player-view-controls { display: flex; align-items: center; gap: 8px; }
.course-appearance { position: relative; }
.course-appearance > summary,
.player-page .focus-toggle {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 13px;
  border: 1px solid var(--studio-control-line);
  border-radius: 10px 10px 3px 10px;
  color: var(--studio-text);
  background: var(--studio-surface);
  cursor: pointer;
  font: 750 11px var(--font-body);
  list-style: none;
}
.course-appearance > summary::-webkit-details-marker { display: none; }
.appearance-icon {
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
  border: 2px solid var(--studio-action);
  border-radius: 50%;
  background: linear-gradient(90deg, var(--studio-action) 50%, transparent 50%);
}
.player-page .focus-toggle > span:first-child { color: var(--studio-action); }
.course-appearance > summary:hover,
.course-appearance[open] > summary,
.player-page .focus-toggle:hover,
.player-page .focus-toggle[aria-pressed="true"] {
  border-color: var(--studio-action);
  color: var(--studio-action-hover);
  background: var(--studio-selected);
}

.course-appearance-panel {
  position: absolute;
  z-index: 120;
  width: min(370px, calc(100vw - 24px));
  top: calc(100% + 11px);
  right: 0;
  overflow: hidden;
  padding: 20px;
  border: 1px solid var(--studio-line);
  border-radius: 17px 17px 6px 17px;
  color: var(--studio-text);
  background: var(--studio-surface);
  box-shadow: 0 24px 70px color-mix(in srgb, var(--studio-text) 18%, transparent);
}
.course-appearance-panel header { padding-bottom: 16px; border-bottom: 1px solid var(--studio-line); }
.course-appearance-panel header > strong { display: block; margin-top: 7px; font: 760 20px/1.15 var(--font-display); }
.course-appearance-panel header > p { margin: 7px 0 0; color: var(--studio-muted); font-size: 11px; line-height: 1.55; }
.course-theme-options { display: grid; gap: 7px; margin: 16px 0 0; padding: 0; border: 0; }
.course-theme-options legend { margin-bottom: 7px; color: var(--studio-muted); font: 650 9px var(--font-utility); letter-spacing: .1em; text-transform: uppercase; }
.course-theme-option {
  position: relative;
  min-height: 62px;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) 20px;
  align-items: center;
  gap: 11px;
  padding: 8px 10px;
  border: 1px solid var(--studio-line);
  border-radius: 11px 11px 4px 11px;
  background: var(--studio-surface-raised);
  cursor: pointer;
}
.course-theme-option:hover { border-color: var(--studio-control-line); }
.course-theme-option:has(input:checked) { border-color: var(--studio-action); background: var(--studio-selected); box-shadow: inset 3px 0 0 var(--studio-action); }
.course-theme-option input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.course-theme-option > span:nth-of-type(2) strong,
.course-theme-option > span:nth-of-type(2) small { display: block; }
.course-theme-option > span:nth-of-type(2) strong { color: var(--studio-text); font-size: 11px; }
.course-theme-option > span:nth-of-type(2) small { margin-top: 2px; color: var(--studio-muted); font-size: 9px; }
.course-theme-check { opacity: 0; color: var(--studio-action); font-weight: 900; }
.course-theme-option:has(input:checked) .course-theme-check { opacity: 1; }
.course-theme-swatch { width: 50px; height: 38px; display: flex; align-items: end; gap: 4px; padding: 7px; border: 1px solid rgba(23,45,45,.16); border-radius: 8px 8px 3px 8px; background: var(--swatch-page); }
.course-theme-swatch i { display: block; width: 10px; border-radius: 3px 3px 1px 3px; background: var(--swatch-text); }
.course-theme-swatch i:nth-child(1) { height: 20px; }
.course-theme-swatch i:nth-child(2) { height: 13px; background: var(--swatch-muted); }
.course-theme-swatch i:nth-child(3) { height: 17px; background: var(--swatch-action); }
.theme-swatch-light { --swatch-page: #f3f7f6; --swatch-text: #172d2d; --swatch-muted: #506563; --swatch-action: #0b6b65; }
.theme-swatch-paper { --swatch-page: #f8f1e4; --swatch-text: #302b24; --swatch-muted: #665e52; --swatch-action: #1f626b; }
.theme-swatch-dark { --swatch-page: #10191b; --swatch-text: #f2f6f4; --swatch-muted: #adbeba; --swatch-action: #61d2c4; }
.course-text-size { min-height: 58px; display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 14px; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--studio-line); }
.course-text-size > span strong,
.course-text-size > span small { display: block; }
.course-text-size > span strong { font-size: 11px; }
.course-text-size > span small { margin-top: 2px; color: var(--studio-muted); font-size: 9px; }
.course-text-size select { min-height: 44px; padding: 0 28px 0 10px; border: 1px solid var(--studio-control-line); border-radius: 9px; color: var(--studio-text); background: var(--studio-surface); font: 750 11px var(--font-body); }
.course-appearance-panel footer { min-height: 35px; display: flex; align-items: end; margin-top: 6px; }
.course-appearance-panel footer button { min-height: 44px; padding: 7px 0 1px; border: 0; color: var(--studio-action); background: transparent; cursor: pointer; font: 750 10px var(--font-body); text-decoration: underline; text-underline-offset: 3px; }

.course-focus-setting { display: grid; gap: 7px; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--studio-line); }
.course-focus-setting .focus-toggle { width: 100%; min-height: 44px; justify-content: flex-start; }
.course-focus-setting .focus-toggle [data-focus-label] { display: inline; }
.course-focus-setting p { margin: 0; color: var(--studio-muted); font-size: 9px; line-height: 1.5; }

/* Shared player surfaces */
.player-page progress,
.player-page progress::-webkit-progress-bar { background: var(--studio-surface-muted); }
.player-page progress::-webkit-progress-value,
.player-page progress::-moz-progress-bar { background: var(--studio-action); }
.player-page .course-outline { border-color: var(--studio-line); background: var(--studio-surface-muted); scrollbar-color: var(--studio-control-line) transparent; }
.player-page .course-outline::before { background: var(--studio-action); box-shadow: 0 0 22px color-mix(in srgb, var(--studio-action) 24%, transparent); }
.player-page .outline-heading,
.player-page .outline-progress-mobile { border-color: var(--studio-line); }
.player-page .outline-course-title,
.player-page .outline-modules summary,
.player-page .outline-progress-mobile strong { color: var(--studio-text); }
.player-page .outline-hint,
.player-page .outline-progress-mobile { color: var(--studio-muted); }
.player-page .outline-hint a,
.player-page .outline-back { color: var(--studio-action); }
.player-page .outline-modules::before { background: var(--studio-line); }
.player-page .outline-modules details,
.player-page .outline-modules summary > span,
.player-page .outline-modules .outline-status { background: var(--studio-surface-muted); }
.player-page .outline-modules details { border-color: var(--studio-line); }
.player-page .outline-modules summary > span,
.player-page .outline-modules a,
.player-page .outline-lesson,
.player-page .outline-modules a small { color: var(--studio-muted); }
.player-page .outline-modules summary small { color: var(--studio-muted); background: var(--studio-surface); }
.player-page .outline-modules a:hover { color: var(--studio-text); background: color-mix(in srgb, var(--studio-surface) 65%, transparent); }
.player-page .outline-modules a[aria-current="page"] { color: var(--studio-text); background: var(--studio-selected); box-shadow: inset 3px 0 0 var(--studio-action); }
.player-page .outline-status { border-color: var(--studio-control-line); }
.player-page a[aria-current="page"] .outline-status { border-color: var(--studio-action); color: var(--studio-action-hover); background: var(--studio-surface); }
.player-page .outline-modules .is-complete .outline-status { border-color: var(--studio-success); color: var(--studio-on-action); background: var(--studio-success); font-weight: 800; }
.player-page .outline-modules .is-current::after { color: var(--studio-action); }

.player-page .lesson-main::before { background-image: linear-gradient(var(--studio-grid) 1px, transparent 1px), linear-gradient(90deg, var(--studio-grid) 1px, transparent 1px); }
.player-page .lesson-heading h1,
.player-page .lesson-copy h2,
.player-page .study-dock-heading h2,
.player-page .player-empty-state strong,
.player-page .lesson-nav-link strong { color: var(--studio-text); }
.player-page .lesson-heading .eyebrow,
.player-page .player-empty-state > span { color: var(--studio-action); }
.player-page .mini-label { color: var(--studio-action); }
.player-page .lesson-heading p,
.player-page .lesson-duration,
.player-page .lesson-nav-link,
.player-page .study-dock-heading p { color: var(--studio-muted); }
.player-page .lesson-heading p { font-size: calc(15px * var(--course-reading-scale)); line-height: 1.7; }
.player-page .player-message { border-color: var(--studio-line); color: var(--studio-text); background: var(--studio-surface-raised); }
.player-page .player-message-success { border-color: var(--studio-success); color: var(--studio-success-text); background: var(--studio-success-bg); }
.player-page .player-message-error { border-color: var(--studio-error); color: var(--studio-error-text); background: var(--studio-error-bg); }
.player-page .lesson-duration,
.player-page .lesson-status,
.player-page .bookmark-button { border-color: var(--studio-line); color: var(--studio-muted); background: var(--studio-surface); }
.player-page .lesson-status > span,
.player-page .bookmark-button > span:first-child { color: var(--studio-action); }
.player-page .bookmark-button:hover { border-color: var(--studio-action); color: var(--studio-action-hover); }
.player-page .bookmark-button.is-active { border-color: var(--studio-warning); color: var(--studio-warning-text); background: var(--studio-warning-bg); }
.player-page .lesson-status.is-complete,
.player-page .completion-state { border-color: var(--studio-success); color: var(--studio-success-text); background: var(--studio-success-bg); }
.player-page .lesson-status.is-complete > span,
.player-page .completion-state > span { color: var(--studio-success); }
.player-page .lesson-mode { color: var(--studio-on-action); background: var(--studio-action); }

/* Quiz and lesson content */
.lesson-practice-chapter {
  scroll-margin-top: 92px;
}
.lesson-practice-chapter.is-embedded {
  margin-top: clamp(48px, 7vw, 76px);
  padding-top: clamp(32px, 5vw, 48px);
  border-top: 1px solid var(--studio-line);
}
.practice-chapter-heading {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 20px;
  margin-bottom: 24px;
}
.practice-chapter-mark {
  width: 104px;
  height: 42px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  overflow: hidden;
  border: 1px solid var(--studio-control-line);
  border-radius: 11px 11px 3px 11px;
  color: var(--studio-muted);
  background: var(--studio-surface);
}
.practice-chapter-mark span {
  display: grid;
  place-items: center;
  border-right: 1px solid var(--studio-line);
  font: 750 10px var(--font-utility);
}
.practice-chapter-mark span:last-child { border-right: 0; }
.practice-chapter-mark span:nth-child(3) {
  color: var(--studio-on-action);
  background: var(--studio-action);
}
.practice-chapter-copy .mini-label { display: block; margin-bottom: 6px; }
.practice-chapter-copy h2 {
  margin: 0;
  color: var(--studio-text);
  font-size: clamp(28px, 4vw, 40px);
  letter-spacing: -.035em;
}
.practice-chapter-copy p {
  max-width: 620px;
  margin: 7px 0 0;
  color: var(--studio-muted);
  font-size: calc(13px * var(--course-reading-scale));
  line-height: 1.65;
}
.practice-chapter-meta {
  min-width: 126px;
  display: grid;
  gap: 3px;
  padding-left: 18px;
  border-left: 1px solid var(--studio-line);
  color: var(--studio-muted);
  font-size: 10px;
  line-height: 1.4;
  text-align: right;
}
.practice-chapter-meta strong { color: var(--studio-text); font-size: 11px; }
.player-page .question-trail-label { color: var(--studio-text); }
.player-page [data-quiz-submit]:disabled {
  color: var(--studio-muted);
  background: var(--studio-surface-muted);
  box-shadow: none;
  cursor: not-allowed;
}
.player-page .question-trail,
.player-page .exercise-card,
.player-page .lesson-copy,
.player-page .player-empty-card,
.player-page .quiz-result { border-color: var(--studio-line); background: var(--studio-surface); box-shadow: var(--studio-shadow); }
.player-page .question-trail-label,
.player-page .question-trail-count,
.player-page .exercise-topline,
.player-page .result-state,
.player-page .quiz-result-score > span { color: var(--studio-muted); }
.player-page .question-trail ol::before { background: var(--studio-line); }
.player-page .question-step { border-color: var(--studio-control-line); color: var(--studio-muted); background: var(--studio-surface); }
.player-page .question-step:hover { border-color: var(--studio-action); color: var(--studio-action-hover); }
.player-page .question-step.is-answered { border-color: var(--studio-success); color: var(--studio-success); background: var(--studio-success-bg); }
.player-page .question-step.is-current { border-color: var(--studio-action); color: var(--studio-on-action); background: var(--studio-action); box-shadow: 0 0 0 4px color-mix(in srgb, var(--studio-action) 18%, transparent); }
.player-page .exercise-card::before { background: linear-gradient(90deg, var(--studio-action), color-mix(in srgb, var(--studio-action) 55%, var(--studio-surface)) 72%, transparent); }
.player-page .exercise-topline { border-color: var(--studio-line); }
.player-page .exercise-form legend,
.player-page .exercise-expression { color: var(--studio-text); }
.player-page .exercise-expression { border-color: var(--studio-line); background: var(--studio-surface-muted); }
.player-page .hint { color: var(--studio-warning); }
.player-page .hint p { border-color: var(--studio-warning); color: var(--studio-warning-text); background: var(--studio-warning-bg); }
.player-page .answer-option { border-color: var(--studio-line); color: var(--studio-text); background: var(--studio-surface-raised); }
.player-page .answer-option:hover { border-color: var(--studio-action); background: var(--studio-selected); }
.player-page .answer-option:has(input:checked) { border-color: var(--studio-action); background: var(--studio-selected); box-shadow: inset 0 0 0 1px var(--studio-action); }
.player-page .radio-ui,
.player-page .check-ui { border-color: var(--studio-control-line); }
.player-page .answer-option input:checked + .radio-ui { border-color: var(--studio-action); background: var(--studio-surface); }
.player-page .answer-option input:checked + .check-ui { border-color: var(--studio-action); color: var(--studio-on-action); background: var(--studio-action); }
.player-page .answer-option .answer-index { border-color: var(--studio-line); color: var(--studio-muted); background: var(--studio-surface); }
.player-page .answer-option:has(input:checked) .answer-index { border-color: var(--studio-action); color: var(--studio-on-action); background: var(--studio-action); }
.player-page .answer-option > span:last-child { font-size: calc(14px * var(--course-reading-scale)); line-height: 1.55; }
.player-page .exercise-actions > span { color: var(--studio-muted); }
.player-page .exercise-actions kbd,
.player-page .video-shortcuts kbd { border-color: var(--studio-control-line); color: var(--studio-text); background: var(--studio-surface-muted); }
.player-page .exercise-closed { border-color: var(--studio-success); background: var(--studio-success-bg); }
.player-page .exercise-closed > span { color: var(--studio-success-text); }
.player-page .exercise-closed > span > span { color: var(--studio-success); }
.player-page .short-answer-field > span { color: var(--studio-muted); }
.player-page .short-answer-field input { border-color: var(--studio-control-line); color: var(--studio-text); background: var(--studio-surface); }
.player-page .short-answer-field input::placeholder { color: var(--studio-muted); }

.player-page .feedback-success { border: 1px solid var(--studio-success); color: var(--studio-success-text); background: var(--studio-success-bg); }
.player-page .feedback-success .feedback-icon { color: var(--studio-on-action); background: var(--studio-success); }
.player-page .feedback-error { border: 1px solid var(--studio-error); color: var(--studio-error-text); background: var(--studio-error-bg); }
.player-page .feedback-error .feedback-icon { color: var(--studio-surface); background: var(--studio-error); }
.player-page .feedback-warning { border: 1px solid var(--studio-warning); color: var(--studio-warning-text); background: var(--studio-warning-bg); }
.player-page .feedback-warning .feedback-icon { color: var(--studio-surface); background: var(--studio-warning); }
.player-page .feedback-next:hover,
.player-page .question-navigation a:hover { color: var(--studio-action-hover); }
.player-page .question-navigation a { color: var(--studio-muted); }
.player-page .quiz-result-score { border-color: var(--studio-line); background: var(--studio-surface-muted); }
.player-page .quiz-result-score strong,
.player-page .quiz-result-copy h2 { color: var(--studio-text); }
.player-page .quiz-result-copy p { color: var(--studio-muted); }
.player-page .quiz-result.is-passed .result-state { color: var(--studio-success); }
.player-page .quiz-result.is-retry .result-state { color: var(--studio-warning); }
.player-page .button-primary { color: var(--studio-on-action); background: var(--studio-action); box-shadow: 0 10px 24px color-mix(in srgb, var(--studio-action) 20%, transparent); }
.player-page .button-primary:hover { color: var(--studio-on-action); background: var(--studio-action-hover); }
.player-page .button-soft { color: var(--studio-action-hover); background: var(--studio-selected); }
.player-page .button-quiet { border-color: var(--studio-control-line); color: var(--studio-text); background: transparent; }
.player-page .button-quiet:hover { border-color: var(--studio-action); color: var(--studio-action-hover); background: var(--studio-selected); }

.player-page .lesson-copy { color: var(--studio-text); font-size: calc(16px * var(--course-reading-scale)); line-height: 1.82; }
.player-page .lesson-article { font-size: calc(17px * var(--course-reading-scale)); }
.player-page .article-callout { border-color: var(--studio-action); color: var(--studio-text); background: var(--studio-selected); }
.player-page .article-callout span { color: var(--studio-action); }
.player-page .player-empty-state { color: var(--studio-text); }
.player-page .player-empty-state p { color: var(--studio-muted); }

/* Video is the only intentionally dark island. Controls follow the chosen preset. */
.player-page .video-studio { overflow: hidden; border-color: var(--studio-line); border-radius: 19px; background: var(--studio-surface); box-shadow: var(--studio-shadow); }
.player-page .video-frame,
.player-page .video-frame video { background-color: #050914; }
.player-page .video-convenience,
.player-page .video-chapters { border-color: var(--studio-line); background: var(--studio-surface-muted); }
.player-page .video-convenience button,
.player-page .video-convenience select,
.player-page .video-shortcuts summary,
.player-page .video-chapters button { border-color: var(--studio-control-line); color: var(--studio-text); background: var(--studio-surface); }
.player-page .video-convenience button:hover,
.player-page .video-shortcuts summary:hover,
.player-page .video-chapters button:hover { border-color: var(--studio-action); color: var(--studio-action-hover); }
.player-page .video-convenience button.is-active,
.player-page .video-chapters button.is-active { border-color: var(--studio-action); color: var(--studio-action-hover); background: var(--studio-selected); box-shadow: inset 3px 0 0 var(--studio-action); }
.player-page .video-convenience label,
.player-page .video-timeline span,
.player-page .video-chapters > summary { color: var(--studio-muted); }
.player-page .video-shortcuts p { border-color: var(--studio-line); color: var(--studio-text); background: var(--studio-surface); box-shadow: var(--studio-shadow); }
.player-page .video-chapters button > span { color: var(--studio-action); }
.player-page .video-timeline input::-webkit-slider-runnable-track { background: linear-gradient(90deg, var(--studio-action) var(--video-progress, 0%), var(--studio-control-line) var(--video-progress, 0%)); }
.player-page .video-timeline input::-moz-range-track { background: var(--studio-control-line); }
.player-page .video-timeline input::-moz-range-progress { background: var(--studio-action); }
.player-page .video-timeline input::-webkit-slider-thumb,
.player-page .video-timeline input::-moz-range-thumb { border-color: var(--studio-surface); box-shadow: 0 0 0 2px var(--studio-action); }

/* Overlay sterowania jest częścią ciemnej wyspy wideo we wszystkich motywach. */
.player-page .video-overlay {
  border-color: transparent;
  background: linear-gradient(180deg, transparent, rgba(4, 8, 18, .88) 42%);
}
.player-page .video-overlay button,
.player-page .video-overlay select,
.player-page .video-overlay .video-shortcuts summary {
  border-color: rgba(255, 255, 255, .2);
  color: #f2f5fa;
  background: rgba(255, 255, 255, .1);
  backdrop-filter: blur(8px);
}
.player-page .video-overlay select { color-scheme: dark; }
.player-page .video-overlay select option {
  color: #f2f5fa;
  background: #111827;
}
.player-page .video-overlay button:hover,
.player-page .video-overlay .video-shortcuts summary:hover {
  border-color: rgba(255, 255, 255, .45);
  color: #fff;
  background: rgba(255, 255, 255, .17);
}
.player-page .video-overlay button.is-active {
  border-color: var(--studio-action);
  color: #fff;
  background: color-mix(in srgb, var(--studio-action) 32%, transparent);
  box-shadow: none;
}
.player-page .video-overlay label,
.player-page .video-overlay .video-timeline span { color: rgba(255, 255, 255, .78); }
.player-page .video-overlay .video-timeline input::-webkit-slider-runnable-track { background: linear-gradient(90deg, var(--studio-action) var(--video-progress, 0%), rgba(255, 255, 255, .28) var(--video-progress, 0%)); }
.player-page .video-overlay .video-timeline input::-moz-range-track { background: rgba(255, 255, 255, .28); }
.player-page .video-overlay .video-timeline input::-webkit-slider-thumb,
.player-page .video-overlay .video-timeline input::-moz-range-thumb { border-color: #050914; }

/* Szybka notatka pod playerem */
.player-page .quick-note { border-top: 0; background: var(--studio-surface); }
.player-page .quick-note > summary { color: var(--studio-muted); }
.player-page .quick-note > summary:hover { color: var(--studio-action-hover); }
.player-page .quick-note-icon,
.player-page .quick-note-time { color: var(--studio-action); }
.player-page .quick-note-caret { color: var(--studio-muted); }
.player-page .quick-note textarea { border-color: var(--studio-control-line); color: var(--studio-text); background: var(--studio-surface); }
.player-page .quick-note textarea:focus { border-color: var(--studio-action); outline-color: color-mix(in srgb, var(--studio-action) 18%, transparent); }
.player-page .quick-note-actions small { color: var(--studio-muted); }
.player-page .quick-note-actions [data-form-status].is-pending { color: var(--studio-muted); }
.player-page .quick-note-actions [data-form-status].is-success { color: var(--studio-success); }
.player-page .quick-note-actions [data-form-status].is-error { color: var(--studio-error); }

/* Study dock and navigation */
.player-page .study-dock,
.player-page .lesson-navigation { border-color: var(--studio-line); }
.player-page .lesson-progress-dock { color: var(--studio-text); background: var(--studio-surface); box-shadow: var(--studio-shadow); }
.player-page .lesson-progress-dock::before { background: var(--studio-action); }
.player-page .lesson-progress-dock.is-complete::before { background: var(--studio-success); }
.player-page .lesson-progress-back { border-color: var(--studio-line); background: var(--studio-surface-muted); }
.player-page .lesson-progress-origin > span { border-color: var(--studio-line); color: var(--studio-action); }
.player-page .lesson-progress-origin strong,
.player-page .lesson-progress-copy > strong { color: var(--studio-text); }
.player-page .lesson-progress-origin small,
.player-page .lesson-progress-copy > small { color: var(--studio-muted); }
.player-page .lesson-progress-kicker { color: var(--studio-action); }
.player-page .lesson-progress-kicker.is-complete { color: var(--studio-success); }
.player-page .lesson-progress-return { border-color: var(--studio-control-line); color: var(--studio-text); background: var(--studio-surface); }
.player-page .lesson-progress-return:hover { border-color: var(--studio-action); color: var(--studio-action-hover); background: var(--studio-selected); }
.player-page .lesson-progress-gate-link { color: var(--studio-action); }
.player-page .lesson-progress-gate-link:hover { color: var(--studio-action-hover); }
.player-page .study-dock-tab { border-color: var(--studio-line); color: var(--studio-muted); background: var(--studio-surface); }
.player-page .study-dock-tab:hover { border-color: var(--studio-action); color: var(--studio-action-hover); }
.player-page #study-tab-transcript:checked ~ .study-dock-tablist [for="study-tab-transcript"],
.player-page #study-tab-note:checked ~ .study-dock-tablist [for="study-tab-note"],
.player-page #study-tab-files:checked ~ .study-dock-tablist [for="study-tab-files"] { border-color: var(--studio-action); color: var(--studio-action-hover); background: var(--studio-selected); box-shadow: inset 3px 0 0 var(--studio-action); }
.player-page .video-chapters nav,
.player-page .question-trail > nav { border-color: var(--studio-line); }
.player-page .video-chapters > summary > span:last-child,
.player-page .question-trail-caret { color: var(--studio-action); }
.player-page .transcript-panel,
.player-page .note-panel,
.player-page .resource-panel { border-color: var(--studio-line); background: var(--studio-surface); }
.player-page .transcript-panel > summary strong,
.player-page .note-panel-heading strong,
.player-page .resource-panel-heading strong { color: var(--studio-text); }
.player-page .transcript-panel > summary small,
.player-page .note-panel-heading small,
.player-page .resource-panel-heading small,
.player-page .transcript-tools label,
.player-page .transcript-tools > span,
.player-page .note-panel label { color: var(--studio-muted); }
.player-page .transcript-panel > summary > span:last-child,
.player-page .note-panel-heading > span { color: var(--studio-action); }
.player-page .transcript-tools { border-color: var(--studio-line); background: var(--studio-surface-muted); }
.player-page .transcript-tools input,
.player-page .note-panel textarea { border-color: var(--studio-control-line); color: var(--studio-text); background: var(--studio-surface); }
.player-page .note-panel textarea::placeholder { color: var(--studio-muted); }
.player-page .transcript-body { color: var(--studio-text); font-size: calc(15px * var(--course-reading-scale)); line-height: 1.85; scrollbar-color: var(--studio-control-line) transparent; }
.player-page .transcript-empty { color: var(--studio-warning); }
.player-page .note-actions [data-form-status].is-pending { color: var(--studio-muted); }
.player-page .note-actions [data-form-status].is-success { color: var(--studio-success); }
.player-page .note-actions [data-form-status].is-error { color: var(--studio-error); }
.player-page .note-signin { border-color: var(--studio-line); }
.player-page .note-signin p { color: var(--studio-muted); }
.player-page .note-signin a { color: var(--studio-action); }
.player-page .resource-panel li a { border-color: var(--studio-line); color: var(--studio-text); background: var(--studio-surface-raised); }
.player-page .resource-panel li a:hover { border-color: var(--studio-action); color: var(--studio-action-hover); }
.player-page .resource-panel li a > span:first-child { color: var(--studio-action); }
.player-page .resource-panel li small,
.player-page .resource-empty { color: var(--studio-muted); }
.player-page .resource-empty { border-color: var(--studio-control-line); }
.player-page .completion-state,
.player-page .save-progress-link,
.player-page .completion-gate,
.player-page .lesson-nav-link > span { border-color: var(--studio-line); }
.player-page .save-progress-link,
.player-page .completion-gate { color: var(--studio-muted); }
.player-page .completion-gate > span { color: var(--studio-warning); }

/* A two-colour focus indicator remains visible on every preset and surface. */
.player-page :where(a, button, input, textarea, select, summary):focus-visible,
.course-appearance-panel :where(input, select, button):focus-visible {
  outline: 2px solid var(--studio-focus-inner) !important;
  outline-offset: 0 !important;
  box-shadow: 0 0 0 4px var(--studio-focus-outer) !important;
}
.course-theme-option:has(input:focus-visible) {
  outline: 2px solid var(--studio-focus-inner);
  outline-offset: 0;
  box-shadow: 0 0 0 4px var(--studio-focus-outer);
}

@media (max-width: 1040px) {
  .course-appearance > summary [data-appearance-label] { display: none; }
  .course-appearance > summary { min-width: 42px; padding-inline: 10px; }
}

@media (max-width: 860px) {
  .player-page .player-header { grid-template-columns: minmax(0, 1fr) auto auto; }
  .player-view-controls { gap: 6px; }
  .player-page .outline-toggle,
  .player-page .outline-close { border-color: var(--studio-control-line); color: var(--studio-text); background: var(--studio-surface); }
  .player-page .outline-backdrop { background: rgba(6, 15, 16, .68); }
}

@media (max-width: 640px) {
  .course-appearance-panel {
    position: fixed;
    width: auto;
    max-height: calc(100vh - 86px);
    inset: 72px 12px auto;
    overflow-y: auto;
  }
  .player-page .mobile-lesson-action { border-color: var(--studio-line); background: color-mix(in srgb, var(--studio-surface) 95%, transparent); }
  .lesson-practice-chapter.is-embedded { margin-top: 44px; padding-top: 30px; }
  .practice-chapter-heading { grid-template-columns: auto minmax(0, 1fr); gap: 14px; margin-bottom: 18px; }
  .practice-chapter-mark { width: 82px; height: 38px; }
  .practice-chapter-copy h2 { font-size: 30px; }
  .practice-chapter-copy p { font-size: calc(12px * var(--course-reading-scale)); }
  .practice-chapter-meta {
    grid-column: 1 / -1;
    min-width: 0;
    display: flex;
    gap: 8px;
    padding: 11px 0 0;
    border-left: 0;
    border-top: 1px solid var(--studio-line);
    text-align: left;
  }
  .practice-chapter-meta > *:not(:last-child)::after { content: " ·"; color: var(--studio-muted); }
}

@media (max-width: 380px) {
  .course-theme-option { grid-template-columns: 48px minmax(0, 1fr) 18px; }
}