.self-study-hub{margin:0 0 24px}.self-study-hub .section-heading{margin-bottom:16px}.preference-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr)) auto;gap:12px;align-items:end;padding-bottom:22px;margin-bottom:22px;border-bottom:1px solid var(--line)}.preference-grid .field{gap:6px;font-size:12px}.preference-grid select{width:100%;min-height:42px}.preference-grid .btn{min-height:42px;font-size:12px;white-space:nowrap}.lesson-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.lesson-card{display:grid;grid-template-columns:46px 1fr;gap:7px 14px;text-align:left;padding:20px;border:1px solid #e4e8e7;border-radius:17px;background:#fcfdfb;transition:transform .15s,border-color .15s}.lesson-card:hover{border-color:#e8ab7f;transform:translateY(-2px)}.lesson-card>.subject-icon{grid-row:1/4}.lesson-card>strong{font-size:17px}.lesson-card>span:not(.subject-icon){font-size:13px;color:var(--muted)}.lesson-card>small{grid-column:2;color:var(--muted)}.lesson-card .lesson-cta{grid-column:2;color:#b85b36!important;display:flex;align-items:center;gap:8px;margin-top:5px}.study-coverage{font-size:11px;margin-top:14px}.study-steps{display:flex;gap:8px;margin:0 0 22px;flex-wrap:wrap}.study-steps span{padding:8px 16px;background:#f0f1ee;border-radius:9px;color:var(--muted);font-size:13px}.study-steps .active{background:var(--orange-soft);color:var(--orange-dark)}.lesson-overview>p{font-size:17px;margin:16px 0}.lesson-overview ol,.worked-example ol{padding-left:23px;line-height:2.2;color:#4f5c6e}.worked-example details{margin:20px 0}.worked-example summary{font-weight:650;cursor:pointer;padding:4px 0}.lesson-start{text-align:center;padding:30px!important}.lesson-start>p{margin:12px auto 20px;max-width:650px}.lesson-start .muted{font-size:12px;margin-bottom:0}.confidence-picker{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin:18px 0}.confidence-picker>.muted{margin-right:7px}.confidence-picker .chip{font-size:12px;min-height:36px}.support-notice{font-size:12px;color:#836746;background:#fff5e6;padding:10px 13px;border-radius:10px;margin-bottom:15px}.hint-stage{display:flex;gap:6px;margin-bottom:12px}.hint-stage span{font-size:11px;padding:4px 9px;border-radius:8px;background:#edf0f3;color:var(--muted)}.hint-stage span.active{background:#e4f3eb;color:#367157}.reflection-box{padding:18px;border:1px solid #dbe9e0;background:#f6faf6;border-radius:14px;margin:18px 0}.reflection-box h3{margin-bottom:10px}.reflection-box .field{margin-top:14px}.reflection-box textarea{min-height:85px}.engagement-choices{display:flex;gap:7px;flex-wrap:wrap;margin:12px 0}.learning-evidence-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:16px 0}.learning-evidence-grid>div{padding:15px;background:#f5f8f5;border-radius:12px}.learning-evidence-grid strong{display:block;font-size:25px}.learning-evidence-grid span{font-size:12px;color:var(--muted)}.review-shell .answer-entry{line-height:1.8}.paper-completed{display:flex;align-items:center;gap:8px;font-size:12px;margin-top:10px}.paper-completed input{width:18px;height:18px;min-height:0}.reflection-note{font-size:12px;color:var(--muted)}
@media(max-width:1100px){.preference-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.preference-grid>.btn{grid-column:1/-1}.lesson-card{padding:16px}}
@media(max-width:680px){.self-study-hub{padding:18px}.lesson-grid{grid-template-columns:1fr}.lesson-card>strong{font-size:15px}.lesson-card>span:not(.subject-icon){font-size:12px}.self-study-hub .section-heading{align-items:flex-start;flex-wrap:wrap}.preference-grid{gap:10px;padding-bottom:16px;margin-bottom:16px}.study-steps{gap:6px}.study-steps span{flex:1 1 40%;font-size:11px;padding:8px}.lesson-overview>p{font-size:15px}.confidence-picker{gap:6px}.confidence-picker>.muted{width:100%;font-size:12px}.confidence-picker .chip{flex:1;padding:7px 8px;white-space:nowrap;font-size:11px}.reflection-box{padding:14px}.learning-evidence-grid{gap:8px}.learning-evidence-grid>div{padding:11px 9px}.learning-evidence-grid strong{font-size:21px}.learning-evidence-grid span{font-size:10px}.engagement-choices .chip{font-size:11px;padding:7px 10px}.lesson-start{padding:22px 17px!important}}
@media(prefers-reduced-motion:reduce){.lesson-card{transition:none}.lesson-card:hover{transform:none}}
@media print{.self-study-hub,.study-steps,.lesson-start{display:none!important}.learning-evidence-grid{display:grid;break-inside:avoid}.learning-evidence-grid>div{border:1px solid #ddd;background:white}.learning-evidence-grid strong{font-size:18pt}}
.solution-upload{padding:16px;margin-top:16px;border:1px dashed #cfddca;background:#f6faf2;border-radius:12px}.solution-upload>.muted{font-size:12px;line-height:1.8;margin-top:8px}.submitted-answer-image{display:block;max-width:100%;max-height:260px;object-fit:contain;margin:12px auto;border-radius:10px}.grading-verdict{display:block;font-size:18px;margin-bottom:15px;line-height:1.7}.grading-correct{color:#30734c}.grading-check{color:#a75334}#ai-feedback details{padding:12px;background:#fff9;border-radius:9px;margin:10px 0}#ai-feedback p{line-height:1.9;overflow-wrap:anywhere}

/* 游戏中心 */
.game-card{min-height:150px}.game-card .subject-icon{font-size:24px}.game-subject-filter{display:flex;align-items:center;gap:10px;max-width:280px;margin-top:18px}.game-subject-filter select{margin-top:0}.game-question-image{display:block;width:100%;max-height:440px;object-fit:contain;background:#fff;margin:12px 0 18px;border:1px solid #edf0f2;border-radius:12px}.game-question-text{font-size:17px;line-height:1.8;margin:12px 0 18px;white-space:pre-wrap}.game-feedback{padding:11px 14px;border-radius:10px;margin:4px 0 14px;font-weight:700}.game-feedback.correct{background:#eaf7ef;color:#287548}.game-feedback.wrong{background:#fff0eb;color:#a75334}

.game-question-image.zoomed{max-height:none;width:100%;cursor:zoom-out}
.game-explanation{background:#f6f8fa;border-left:3px solid #7c5cd6;padding:10px 12px;border-radius:0 8px 8px 0;margin-top:8px;font-size:14px;line-height:1.7;color:#444;max-height:240px;overflow:auto;white-space:pre-wrap}
.mm-card{transition:all .15s}
#game-next{min-width:120px}

.option-correct{background:#e8f5e9!important;border:2px solid #388e3c!important}
.option-correct .option-key{background:#388e3c;color:#fff}
.option-wrong{background:#fdecea!important;border:2px solid #c0392b!important}
.option-wrong .option-key{background:#c0392b;color:#fff}
#review-result-label{position:sticky;top:8px;z-index:5;box-shadow:0 2px 8px rgba(0,0,0,.12)}