.video-classroom{padding:26px}.video-heading{display:flex;justify-content:space-between;gap:18px;align-items:center}.video-heading h2{font-size:1.65rem;margin:12px 0 3px}.video-heading p{margin:0;color:#627565}.video-length{flex-shrink:0;text-align:center;border-radius:20px;background:#fff2d8;color:#795c2a;padding:12px 18px;font-size:1.25rem;font-weight:700}.video-length small{font-size:.75rem;font-weight:400}.lesson-path{list-style:none;display:flex;gap:12px;flex-wrap:wrap;margin:22px 0;padding:0}.lesson-path li{display:flex;align-items:center;gap:7px;font-size:.88rem;color:#59725c}.lesson-path b{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;background:#e5eeda}.grammar-player{display:block;width:100%;aspect-ratio:16/9;max-height:610px;background:#f8faf2;border:1px solid #dce6d7;border-radius:18px}.grammar-player::cue{font-family:'Microsoft YaHei',sans-serif;font-size:1em;background:rgba(25,42,35,.92);color:white}.video-controls{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin-top:16px}.video-controls label{display:flex;gap:8px;align-items:center;font-size:.9rem}.video-controls select{width:auto;margin:0;min-height:44px}.video-chapters{margin:16px 0;border-top:1px dashed #d8e0d0;padding-top:12px}.chapter-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-top:12px}.chapter-grid button{text-align:left;font-size:.85rem;white-space:normal}.video-practice-callout{background:#f2f5e7;border-radius:18px;padding:20px;display:flex;gap:16px;align-items:center;justify-content:space-between;margin:18px 0}.video-practice-callout p{margin:4px 0 0;font-size:.9rem}.video-practice-callout button{flex-shrink:0}.practice-station{scroll-margin-top:20px}.guided-card{border:1px solid #e1e6d6;border-radius:18px;padding:20px;margin-top:14px;background:#fffef9}.guided-card details{margin-top:14px}.guided-card .spelling input{font-size:1.1rem}.guided-card h3{line-height:1.7}.guided-card .feedback{margin-top:16px}.lesson-independent{border-top:1px dashed #d8e0d0;margin-top:24px;padding-top:20px}.quiz-video-help{margin-top:16px;border:1px solid #d8e0d0;border-radius:16px;padding:14px}.quiz-video-help video{margin-top:14px}.video-badge{align-self:flex-start;background:#f5ecdc;color:#7b5a25;font-size:.8rem;white-space:normal}.lesson-review-banner{margin-bottom:20px;background:#f2f5e7}.video-error{background:#fff2d8;color:#765221;padding:12px;border-radius:12px}.video-error[hidden]{display:none}.video-classroom summary,.guided-card summary{cursor:pointer}.video-classroom .small{font-size:.83rem}.lesson-original{margin-top:24px}.lesson-original>summary{font-weight:700;font-size:1.12rem}.lesson-original .rule{font-size:1.1rem}.lesson-detail{max-width:1000px}.lesson-card .video-badge{margin-top:12px}
@media(max-width:600px){.video-classroom{padding:15px}.video-heading{gap:8px}.video-heading h2{font-size:1.35rem}.video-length{padding:10px;font-size:1.05rem}.video-heading p{font-size:.9rem}.lesson-path{gap:9px;display:grid;grid-template-columns:1fr 1fr}.lesson-path li{font-size:.8rem}.grammar-player{border-radius:12px}.video-practice-callout{align-items:stretch;flex-direction:column;padding:16px}.video-controls{gap:8px}.chapter-grid{grid-template-columns:1fr}.guided-card{padding:14px}.video-heading .badge{font-size:.75rem}.video-controls button{font-size:.83rem}.video-controls label{flex-basis:100%}.practice-station{padding:18px}.lesson-detail .header h1{font-size:1.6rem}.video-classroom .video-length small{white-space:nowrap}}