/* 系统课程：目录、轨道页、单元播放器。只用 /brand.css 的 token，不写色值；手机优先。 */
.course-page { max-width: 860px; }
.course-page h1 { overflow-wrap: anywhere; }
.course-badge { display: inline-block; font-size: 13px; line-height: 1.4; padding: 2px 9px; border-radius: 999px;
  border: 1px solid var(--border-strong); color: var(--text-muted); background: var(--surface); vertical-align: middle; margin-left: 6px; }
.course-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: clamp(16px, 3vw, 24px); margin: 16px 0; }
.course-card h2, .course-card h3 { margin-top: 0; }
.course-card > :last-child { margin-bottom: 0; }
.course-meta { display: flex; flex-wrap: wrap; gap: 6px 14px; color: var(--text-muted); font-size: 14px; margin: 6px 0 12px; }
.course-list { padding-left: 1.3em; margin: 8px 0; }
.course-list li { margin: 4px 0; }
.course-steps { list-style: none; padding: 0; margin: 14px 0 6px; display: flex; flex-wrap: wrap; gap: 6px; }
.course-steps li { font-size: 13px; padding: 4px 10px; border-radius: 999px; border: 1px solid var(--border); color: var(--text-muted); background: var(--bg); }
.course-steps li.done { color: var(--st-ok); border-color: var(--st-ok); }
.course-steps li.current { color: var(--on-primary); background: var(--primary); border-color: var(--primary); font-weight: 600; }
.course-section-title { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.course-section-title small { color: var(--text-muted); font-weight: 400; font-size: 14px; }
.course-item { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: clamp(14px, 3vw, 22px); margin: 16px 0; }
.course-item-head { color: var(--text-muted); font-size: 14px; margin: 0 0 6px; }
.course-prompt { white-space: pre-wrap; font-size: 18px; line-height: 1.6; margin: 6px 0 12px; font-weight: 600; color: var(--heading); }
.course-item fieldset, .course-rating fieldset { border: 0; padding: 0; margin: 10px 0; min-width: 0; }
.course-item legend, .course-rating legend { font-weight: 600; margin-bottom: 8px; padding: 0; }
.course-choice { display: flex; gap: 10px; align-items: flex-start; padding: 11px 12px; border: 1px solid var(--border-strong); border-radius: var(--radius-sm); margin: 7px 0; cursor: pointer; }
.course-choice input { margin-top: 5px; flex: 0 0 auto; }
.course-choice span { min-width: 0; overflow-wrap: anywhere; }
.course-item label.course-field { display: block; margin: 10px 0 4px; font-weight: 600; }
.course-item input[type=text], .course-item textarea, .course-item select { width: 100%; box-sizing: border-box; padding: 11px 12px; font: inherit;
  border: 1px solid var(--field-line); border-radius: var(--radius-sm); background: var(--field-bg); color: var(--text); }
.course-item textarea { min-height: 88px; }
.course-working { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 15px; white-space: pre-wrap; background: var(--surface);
  border-radius: var(--radius-sm); padding: 10px 12px; margin: 8px 0; overflow-x: auto; }
.course-result { border-left: 4px solid var(--border-strong); background: var(--surface); padding: 12px 14px; margin: 12px 0 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.course-result.correct { border-color: var(--st-ok); }
.course-result.incorrect { border-color: var(--st-no); }
.course-result .verdict { font-weight: 700; }
.course-result .verdict.correct { color: var(--st-ok); }
.course-result .verdict.incorrect { color: var(--st-no); }
.course-five { margin: 10px 0 0; display: grid; grid-template-columns: max-content 1fr; gap: 6px 12px; }
.course-five dt { font-weight: 600; color: var(--heading); }
.course-five dd { margin: 0; min-width: 0; overflow-wrap: anywhere; }
@media (max-width: 480px) { .course-five { grid-template-columns: 1fr; } .course-five dd { margin-bottom: 6px; } }
.course-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; }
.course-tag { font-size: 13px; padding: 2px 9px; border-radius: 999px; background: var(--info-bg); color: var(--text); border: 1px solid var(--border); }
.course-table-wrap { overflow-x: auto; margin: 10px 0; }
.course-table { border-collapse: collapse; width: 100%; font-size: 14px; }
.course-table th, .course-table td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
.course-table th { background: var(--surface); color: var(--heading); }
.course-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 14px; align-items: center; }
.course-note { background: var(--info-bg); border-left: 4px solid var(--link); padding: 12px 14px; border-radius: var(--radius-sm); margin: 12px 0; }
.course-warn { background: var(--caution-bg); color: var(--text); border-left: 4px solid var(--border-strong); padding: 12px 14px; border-radius: var(--radius-sm); margin: 12px 0; }
.course-sources { font-size: 13px; color: var(--text-muted); margin: 6px 0 0; }
.course-sources a { color: var(--link); overflow-wrap: anywhere; }
.course-timer { font-variant-numeric: tabular-nums; color: var(--text-muted); font-size: 14px; }
.course-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); }
.course-unit-link { display: block; text-decoration: none; color: inherit; }
.course-unit-link:hover h3, .course-unit-link:focus-visible h3 { color: var(--link); }
.course-status { font-size: 14px; color: var(--text-muted); }
.course-facts td:first-child { min-width: 11em; }
.course-page details > summary { cursor: pointer; font-weight: 600; padding: 6px 0; }
.course-page .study-error { color: var(--danger-text); }
.course-page button { min-height: 44px; }
.course-page [hidden] { display: none !important; }
.course-table th:first-child, .course-table td:first-child { min-width: 5.5em; }
.course-micro th:first-child, .course-micro td:first-child { min-width: 11em; }
/* Exam-fact choices: one label per line would stretch each row on a phone; keep 官方没说 on one line and
   stack the choices under the statement below 480 px. */
.course-facts .course-choice span { white-space: nowrap; }
@media (max-width: 480px) {
  .course-facts, .course-facts tbody, .course-facts tr, .course-facts td { display: block; width: auto; }
  .course-facts tr { border: 1px solid var(--border); border-radius: var(--radius-sm); margin: 0 0 10px; }
  .course-facts td { border: 0; }
  .course-facts td:first-child { min-width: 0; padding-bottom: 0; }
  .course-facts fieldset { display: flex; flex-wrap: wrap; gap: 6px 8px; border: 0; padding: 0; margin: 4px 0 0; min-width: 0; }
  .course-facts .course-choice { margin: 0; padding: 8px 12px; }
}
/* 选考试：一门考试一行，整行可点；当前选择加主色边框 */
.course-pick-group { margin: 22px 0 8px; }
.course-pick-group h2 { font-size: 16px; color: var(--text-muted); font-weight: 600; margin: 0 0 8px; }
.course-pick { display: flex; flex-direction: column; gap: 2px; padding: 14px 16px; margin: 8px 0; min-height: 44px; box-sizing: border-box;
  background: var(--card); border: 1px solid var(--border-strong); border-radius: var(--radius); text-decoration: none; color: var(--text); }
.course-pick:hover { border-color: var(--primary); }
.course-pick.current { border: 2px solid var(--primary); padding: 13px 15px; }
.course-pick-name { font-weight: 600; font-size: 17px; color: var(--heading); overflow-wrap: anywhere; }
.course-pick-meta { font-size: 14px; color: var(--text-muted); }
.course-track-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; margin-top: 8px; }
.course-eyebrow { margin: 0; font-size: 14px; font-weight: 600; color: var(--text-muted); }
.course-switch { font-size: 15px; white-space: nowrap; padding: 10px 0; }
/* 课程录音：播放键 + 已播放次数；原文在「看原文」或交答案后的讲解里。手机上整行排不下就换行。 */
.course-audio { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 12px; margin: 8px 0 12px; }
.course-audio-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; }
.course-audio-count { font-size: 14px; color: var(--text-muted); font-variant-numeric: tabular-nums; }
.course-audio .course-status { margin: 6px 0 0; }
.course-audio .study-error { margin: 8px 0 0; }
.course-transcript { margin: 8px 0 0; }
.course-transcript-lines { list-style: none; padding: 0; margin: 6px 0 0; }
.course-transcript-lines li { display: flex; gap: 10px; margin: 4px 0; min-width: 0; }
.course-transcript-lines li span:last-child { min-width: 0; overflow-wrap: anywhere; }
.course-transcript-time { flex: 0 0 auto; color: var(--text-muted); font-variant-numeric: tabular-nums; font-size: 14px; padding-top: 1px; }
.course-fact { margin: 10px 0 0; }
.course-section-table th { width: 30%; }
.course-walk-steps li { margin: 6px 0; }
.course-advice p { margin: 6px 0; }
/* Engine batch 2：题目配图、多选、连词成句、同一段录音的题组、写作 / 口语单元、整卷演练 */
.course-figure { margin: 8px 0 12px; }
.course-figure img { display: block; max-width: 100%; height: auto; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--card); }
.course-pick-count { margin: 4px 0 0; }
.course-multi-review li.course-pick-right { color: var(--st-ok); }
.course-multi-review li.course-pick-wrong { color: var(--st-no); }
.course-order { margin: 8px 0; }
.course-order-line, .course-order-bank { display: flex; flex-wrap: wrap; gap: 8px; min-height: 48px; align-items: center; padding: 8px; border-radius: var(--radius-sm); }
.course-order-line { border: 1px dashed var(--border-strong); background: var(--surface); margin-bottom: 8px; }
.course-order-bank { border: 1px solid var(--border); }
.course-tile { min-height: 44px; padding: 8px 12px; border-radius: var(--radius-sm); border: 1px solid var(--border-strong); background: var(--card); color: var(--text); font: inherit; cursor: pointer; overflow-wrap: anywhere; }
.course-tile.placed { border-color: var(--primary); color: var(--heading); font-weight: 600; }
.course-grouped { border-color: var(--border-strong); }
.course-clip-group { margin-top: 0; }
.course-printed { margin: 8px 0 12px; }
.course-printed ol { margin: 6px 0 0; }
.course-model-para { margin: 8px 0 12px; }
.course-model-para p { margin: 4px 0; overflow-wrap: anywhere; }
.course-model-note { font-size: 14px; color: var(--text-muted); border-left: 3px solid var(--border-strong); padding-left: 8px; }
.course-criteria th { width: 30%; }
.course-compare { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); align-items: start; }
.course-compare h3 { margin: 16px 0 0; }
.course-draft-text { white-space: pre-wrap; overflow-wrap: anywhere; margin: 6px 0; }
.course-draft audio, .course-recorder audio { width: 100%; margin: 8px 0; }
.course-word-count { font-variant-numeric: tabular-nums; }
.course-word-off { color: var(--danger-text); }
.course-page a.course-button { display: inline-flex; align-items: center; min-height: 44px; padding: 0 18px; border-radius: var(--radius-sm); background: var(--primary); color: var(--on-primary); text-decoration: none; font-weight: 600; }
.course-types tr.course-type-weak td:first-child { font-weight: 600; color: var(--st-no); }
/* engine batch 3：英语底子小测入口、先修补救、演练就绪 */
.course-diagnostic-link { display: inline-block; margin: 2px 0 10px; font-size: 14px; }
.course-remedy { border-style: dashed; }
.course-remedy h3 { margin-top: 0; font-size: 17px; overflow-wrap: anywhere; }
.course-readiness h2 { margin-bottom: 6px; }
/* 共用一篇文章的题组、复测题组（engine batch 3） */
.course-passage { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 14px; margin: 10px 0; }
.course-passage h3 { margin: 0 0 6px; font-size: 16px; overflow-wrap: anywhere; }
.course-passage-text { white-space: pre-wrap; line-height: 1.7; margin: 0; overflow-wrap: anywhere; }
.course-set .course-item-head { margin-top: 12px; }
.course-set-review li { margin: 6px 0; }

/* One transparent mascot per heading or feedback section; no question/answer decoration. */
.course-otter-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 12px; }
.course-otter-heading > :first-child { min-width: 0; margin: 0; overflow-wrap: anywhere; }
.course-otter { display: block; flex: 0 0 auto; width: 96px; height: 96px; max-width: 120px; max-height: 120px; object-fit: contain; }
.course-unit-link .course-otter { width: 72px; height: 72px; }
@media (max-width: 600px) {
  .course-otter-heading { flex-direction: column-reverse; align-items: flex-start; gap: 8px; }
  .course-otter { width: 80px; height: 80px; }
}

/* Young learners (body.course-kid: AEIS primary maths, CEQ A2) — same tokens, softer and more playful. */
body.course-kid .course-card, body.course-kid .course-item { border-radius: 22px; border-width: 2px; }
body.course-kid .course-card { background: var(--tint); border-color: var(--border); }
body.course-kid .course-card[open] { border-color: var(--primary); }
body.course-kid .course-card > summary { display: flex; align-items: center; gap: 10px; font-size: 17px; color: var(--heading); }
body.course-kid .course-stage-otter { width: 44px; height: 44px; object-fit: contain; flex: 0 0 auto; }
body.course-kid .course-item { background: var(--card); }
body.course-kid .course-prompt { font-size: 18px; line-height: 1.55; }
body.course-kid .course-otter { width: 120px; height: 120px; }
body.course-kid .course-steps li { font-size: 14px; padding: 5px 12px; border-width: 2px; }
body.course-kid .course-steps li.done::before { content: '★ '; color: var(--accent-strong); }
body.course-kid .course-choice { border-radius: 16px; border-width: 2px; }
body.course-kid .course-result { border-radius: 16px; border-left-width: 6px; }
body.course-kid .verdict { font-size: 18px; font-weight: 700; display: flex; align-items: center; gap: 8px; }
body.course-kid .course-star { display: inline-grid; place-items: center; width: 32px; height: 32px; border-radius: 50%;
  background: var(--caution-bg); color: var(--accent-strong); font-size: 20px; line-height: 1; border: 2px solid var(--accent-strong); }
body.course-kid .course-working-fold > summary { color: var(--link); }
@media (max-width: 520px) { body.course-kid .course-otter { width: 96px; height: 96px; } }

/* Track page: folded unit list (one line per unit; the next unit stays a full card). */
.course-next-label { margin: 18px 0 -6px; }
.course-unit-row { border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--card); padding: 10px 14px; margin: 8px 0; }
.course-unit-row.done .course-unit-row-title::after { content: ' ✓'; color: var(--st-ok); }
.course-unit-row-link { display: flex; flex-direction: column; gap: 2px; text-decoration: none; color: var(--heading); }
.course-unit-row-link:hover .course-unit-row-title, .course-unit-row-link:focus-visible .course-unit-row-title { color: var(--link); }
.course-unit-row-title { font-weight: 600; }
.course-unit-row-more > summary { font-size: 13px; color: var(--link); cursor: pointer; margin-top: 4px; }
body.course-kid .course-unit-row { border-radius: 16px; border-width: 2px; background: var(--tint); }
.course-unit-row { display: flex; align-items: flex-start; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.course-unit-row-link { flex: 1 1 220px; min-width: 0; }
.course-unit-row-more { flex: 0 0 auto; }
.course-unit-row-more[open] { flex-basis: 100%; }

/* 中 / EN toggle at the end of the course nav row (public/course-i18n.js): the current language is bold. */
.course-page > nav { align-items: center; }
main.course-page > nav > button.course-lang { margin-left: auto; display: inline-flex; align-items: center; gap: 3px; min-height: 44px; padding: 4px 14px; border: 1px solid var(--border-strong);
  border-radius: 999px; background: var(--surface); color: var(--text-muted); font: 600 13px/1 Inter, system-ui, sans-serif; cursor: pointer; white-space: nowrap; }
main.course-page > nav > button.course-lang:hover { color: var(--heading); background: var(--surface); }
.course-lang .on { color: var(--heading); font-weight: 700; }
.course-lang-bar { opacity: .5; }