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img{width:100%;height:100%;object-fit:cover;display:block}.lesson-cover-ph{width:100%;height:100%;background:#eef2f7}.lesson-play{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;pointer-events:none}.lesson-play span{width:38px;height:38px;border-radius:50%;background:#0c4a6ec7;color:#fff;display:flex;align-items:center;justify-content:center;font-size:17px;padding-left:3px;box-shadow:0 2px 10px #0f172a40}.lesson-card:hover .lesson-play span{background:var(--brand)}.lesson-card:focus-visible .lesson-cover{outline:2px solid var(--brand)}.lesson-player{display:flex;flex-direction:column;gap:10px}.lp-title{font-size:17px;font-weight:600;color:var(--deep);margin:0;line-height:1.4}.lp-no{color:var(--brand);margin-right:2px}.lp-meta{display:flex;align-items:center;gap:12px;font-size:12px;color:var(--muted)}.lp-plays{color:var(--ink-2)}.lp-book{margin-left:auto}.lp-video-wrap{position:relative;width:100%}.lp-video{width:100%;max-height:58vh;background:#000;border-radius:10px;display:block;-webkit-touch-callout:none;-webkit-user-select:none;user-select:none}.video-overlay.loading{position:absolute;top:0;right:0;bottom:0;left:0;z-index:2;display:flex;align-items:center;justify-content:center;gap:8px;color:#fff;font-size:13px;background:#0000004d;border-radius:10px;pointer-events:none}.video-overlay-text{font-size:13px}.video-spinner{width:20px;height:20px;border-radius:50%;border:2px solid rgba(255,255,255,.35);border-top-color:#fff;animation:video-spin .8s linear infinite}@keyframes video-spin{to{transform:rotate(360deg)}}.video-retry{pointer-events:auto;padding:4px 12px;border-radius:6px;border:0;background:var(--brand);color:#fff;font-size:12px;font-family:inherit;cursor:pointer}.video-center-btn{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:3;width:56px;height:56px;border-radius:50%;border:0;background:#0c4a6ed1;color:#fff;font-size:18px;padding-left:3px;cursor:pointer;box-shadow:0 4px 16px #0f172a59}.video-center-btn:hover{background:var(--brand)}.video-center-btn.playing{opacity:0;pointer-events:none}.lp-hidden{display:none!important}.lp-actions{display:flex;gap:10px;flex-wrap:wrap}.lp-act{display:inline-flex;align-items:center;gap:5px;padding:6px 12px;border-radius:999px;border:1px solid var(--border);background:#fff;color:var(--ink-2);font-size:13px;font-family:inherit;cursor:pointer}.lp-act:hover{border-color:var(--brand);color:var(--brand)}.lp-act.on{border-color:var(--brand);color:var(--brand);background:#f0f9ff}.lp-act.locked,.lp-practice-btn.locked{opacity:.5;cursor:not-allowed;filter:grayscale(1)}.lp-act.locked:hover{border-color:var(--border);color:var(--ink-2)}.lp-login-hint{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:8px;font-size:12px;color:var(--muted)}.lp-practice-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:4px;padding-top:10px;border-top:1px solid var(--border)}.lp-practice-btn{padding:8px 18px;border-radius:8px;border:0;background:var(--brand);color:#fff;font-size:14px;font-weight:600;font-family:inherit;cursor:pointer}.lp-practice-btn:disabled{opacity:.6;cursor:default}.lp-genmsg{display:block;margin-top:6px;font-size:12px;color:var(--muted)}.lp-paper-block{margin-top:12px}.lp-paper-scroll{max-height:300px;overflow-y:auto;overscroll-behavior:contain;display:flex;flex-direction:column;gap:4px;scrollbar-gutter:stable}.lp-paper-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:8px 10px;border-radius:8px;background:var(--bg, #f8fafc)}.lp-paper-row:hover{background:#eef2ff}.lp-paper-more{padding:8px 10px;font-size:12px;color:var(--muted)}.lp-paper-title{font:inherit;font-size:14px;font-weight:600;line-height:1.45;color:var(--brand);background:none;border:0;padding:0;text-align:left;cursor:pointer;max-width:100%}.lp-paper-title:hover{text-decoration:underline}.lp-paper-time{font-size:12px;color:var(--muted);margin-left:auto}.tabbar{display:none}.tab-item{flex:1;text-align:center;font-size:11px;color:var(--muted);background:none;border:0;font-family:inherit;padding:4px 0;cursor:pointer}.tab-item .ti{display:block;font-size:19px;line-height:1.25}.tab-item.on{color:var(--brand);font-weight:600}@media (max-width: 640px){.tabbar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:60;background:#fff;border-top:1px solid var(--border);box-shadow:0 -2px 12px #0f172a0f;padding:6px 0 calc(6px + env(safe-area-inset-bottom))}.tabbar a{text-decoration:none}}