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ease}.lesson-row:hover{border-color:var(--line-strong);transform:translate(2px)}.lesson-row-num{flex-shrink:0;width:34px;height:34px;border-radius:10px;background:var(--gold-soft);color:var(--gold);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:13px}.lesson-row-main{flex:1;min-width:0}.lesson-row-title{font-weight:700;font-size:14.5px;color:var(--ink)}.lesson-row-desc{font-size:12.5px;color:var(--ink-faint);margin-top:2px}.module-list{display:flex;flex-direction:column;gap:9px}@media(min-width:1024px){.module-list{display:grid;grid-template-columns:1fr 1fr;gap:10px 14px}}.module-row{display:flex;align-items:center;gap:13px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-md);padding:13px 14px;box-shadow:var(--shadow-sm);transition:border-color .15s ease,transform .15s ease}.module-row:hover{border-color:var(--line-strong);transform:translate(2px)}.module-row-icon{flex-shrink:0;width:42px;height:42px;border-radius:12px;display:flex;align-items:center;justify-content:center;color:#fff}.module-row-body{flex:1;min-width:0}.module-row-label{font-weight:700;font-size:14px;color:var(--ink)}.module-row-num{font-size:11px;color:var(--ink-faint);font-weight:700;letter-spacing:.04em}.module-row-chevron{color:var(--ink-faint);flex-shrink:0}.module-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}@media(min-width:420px){.module-grid{grid-template-columns:1fr 1fr 1fr}}@media(min-width:1024px){.module-grid{gap:14px}}.module-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:18px 12px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:8px;font-weight:700;font-size:13.5px;color:var(--ink);transition:transform .15s ease,box-shadow .15s 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var(--line);border-radius:var(--radius-md)}.char-writer-actions{display:flex;gap:8px}.char-writer-hint{font-size:12px;color:var(--ink-faint);text-align:center;margin:0}.instructor-grid{display:grid;grid-template-columns:1fr;gap:14px}@media(min-width:760px){.instructor-grid{grid-template-columns:1fr 1fr}}.instructor-card{display:flex;gap:16px;align-items:flex-start}.instructor-avatar{width:76px;height:76px;border-radius:50%;object-fit:cover;flex-shrink:0;background:var(--bg-alt)}.instructor-avatar-empty{display:flex;align-items:center;justify-content:center;color:var(--ink-faint)}.instructor-body{min-width:0}.instructor-name{font-family:var(--font-display);font-weight:800;font-size:16.5px}.instructor-title{color:var(--gold);font-weight:700;font-size:12.5px;margin-top:2px}.instructor-bio{color:var(--ink-soft);font-size:13.5px;margin-top:8px;line-height:1.55}.tabs{display:flex;gap:7px;overflow-x:auto;margin-bottom:14px;padding-bottom:4px}.tab-btn{flex-shrink:0;padding:9px 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var(--line-strong);background:var(--surface);font-size:15px;font-weight:600;color:var(--ink);transition:border-color .12s ease,background .12s ease,transform .1s ease;display:flex;align-items:center;gap:10px}.option-btn:hover:not(:disabled){border-color:var(--primary);background:var(--primary-soft)}.option-btn:active:not(:disabled){transform:scale(.99)}.option-btn.correct{border-color:var(--correct);background:var(--correct-soft);color:var(--jade-dark);font-weight:700}.option-btn.wrong{border-color:var(--wrong);background:var(--wrong-soft);color:var(--wrong);font-weight:700}.exercise-feedback{margin-top:18px;padding:15px;border-radius:var(--radius-md);background:var(--bg-alt)}.exercise-feedback.ok{background:var(--correct-soft)}.exercise-feedback.no{background:var(--wrong-soft)}.exercise-feedback-title{font-weight:800;margin-bottom:5px;font-size:15px}.exercise-feedback.ok .exercise-feedback-title{color:var(--jade-dark)}.exercise-feedback.no 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cubic-bezier(.2,.8,.2,1);cursor:pointer}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;border-radius:var(--radius-lg);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;padding:20px;text-align:center;box-shadow:var(--shadow-md)}.flashcard-front{background:linear-gradient(155deg,var(--primary) 0%,var(--primary-darker) 100%);color:#fff}.flashcard-back{background:linear-gradient(155deg,var(--jade) 0%,var(--jade-dark) 100%);color:#fff;transform:rotateY(180deg)}.flashcard-hanzi{font-family:var(--font-cn-serif);font-size:calc(42px * var(--hanzi-scale));font-weight:var(--hanzi-weight)}.flashcard-back .flashcard-hanzi{font-size:calc(30px * var(--hanzi-scale))}.flashcard-pinyin{font-size:calc(15px * var(--pinyin-scale));opacity:.9;font-weight:600}.flashcard-meaning{font-size:calc(19px * var(--meaning-scale));font-weight:800}.flashcard-example{font-size:13px;opacity:.85}.flashcard-hint{font-size:11.5px;opacity:.75;text-transform:uppercase;letter-spacing:.05em}.flashcard-face .speak-btn{background:#ffffff2e;color:#fff}.flashcard-face .speak-btn:hover{background:#ffffff47}.flashcard-actions{display:flex;gap:10px;width:100%;max-width:320px}.fc-btn{flex:1;padding:13px 0;border-radius:var(--radius-md);border:none;font-weight:800;color:#fff;font-size:13.5px;display:flex;align-items:center;justify-content:center;gap:6px;transition:transform .1s ease}.fc-btn:active{transform:scale(.96)}.fc-known{background:var(--jade)}.fc-unknown{background:var(--wrong)}.flip-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}@media(min-width:480px){.flip-grid{grid-template-columns:repeat(3,1fr)}}@media(min-width:760px){.flip-grid{grid-template-columns:repeat(4,1fr);gap:16px}}@media(min-width:1024px){.flip-grid{grid-template-columns:repeat(5,1fr)}}.flip-tile{aspect-ratio:1;perspective:1000px;cursor:pointer;border-radius:var(--radius-lg)}.flip-tile-inner{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .45s cubic-bezier(.2,.8,.2,1)}.flip-tile-inner.is-flipped{transform:rotateY(180deg)}.flip-tile-face{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;border-radius:var(--radius-lg);display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:10px;box-shadow:var(--shadow-sm)}.flip-tile-front{background:var(--surface);border:1px solid var(--line)}.flip-tile-hanzi{font-family:var(--font-cn-serif);font-size:calc(clamp(20px,4vw,28px) * var(--hanzi-scale));font-weight:var(--hanzi-weight);color:var(--hanzi-color)}.flip-tile-speak{position:absolute;top:8px;right:8px;width:26px;height:26px;border:none;border-radius:50%;background:var(--bg-alt);color:var(--ink-soft);display:flex;align-items:center;justify-content:center}.flip-tile-speak:hover{background:var(--primary-soft);color:var(--primary-dark)}.flip-tile-back{background:linear-gradient(155deg,var(--teal) 0%,var(--teal-dark) 100%);color:#fff;transform:rotateY(180deg);gap:5px}.flip-tile-pinyin{font-size:calc(clamp(13px,2.4vw,16px) * var(--pinyin-scale));font-weight:800}.flip-tile-meaning{font-size:calc(clamp(11px,2vw,13px) * var(--meaning-scale));opacity:.9}.flip-tile-type{margin-top:4px;background:#ffffff38;color:#fff;font-size:10.5px;font-weight:700;padding:2px 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