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var(--border);border-radius:14px;overflow:hidden;background:#eef1f6}.m3-stage.dark{background:#14161d}.m3-stage canvas{display:block;width:100%;height:100%;touch-action:none;outline:none}.m3-stage.adding canvas{cursor:crosshair}.m3-stage:fullscreen{height:100vh;border-radius:0;border:0}@media (max-width: 700px){.m3-stage{height:380px}}.m3-over{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;color:#4b5168;font-weight:600;text-align:center;padding:24px;background:#eef1f6d9}.m3-stage.dark .m3-over{color:#c8ccdc;background:#14161dd9}.m3-over.err{color:#b91c1c}.m3-spin{width:28px;height:28px;border:3px solid rgba(79,70,229,.25);border-top-color:#4f46e5;border-radius:50%;animation:m3spin .8s linear infinite}@keyframes m3spin{to{transform:rotate(360deg)}}.m3-bar{position:absolute;top:10px;right:10px;display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end;max-width:calc(100% - 20px)}.m3-bar button,.m3-group{height:34px;min-width:34px;border:1px solid rgba(0,0,0,.12);background:#ffffffeb;color:#26293b;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;gap:6px;cursor:pointer;font:600 12.5px inherit;padding:0 8px;box-shadow:0 1px 3px #0000001f}.m3-bar button:hover{background:#fff}.m3-bar button.on{background:#4f46e5;color:#fff;border-color:#4f46e5}.m3-bar button.wide{padding:0 12px}.m3-group{padding:0;overflow:hidden;gap:0}.m3-group button{border:0;box-shadow:none;border-radius:0;background:transparent}.m3-group select{border:0;background:transparent;height:100%;font:600 12.5px inherit;color:#26293b;padding:0 6px;max-width:140px}.m3-info{position:absolute;left:12px;bottom:10px;font-size:11.5px;font-weight:600;color:#6b7088;pointer-events:none}.m3-stage.dark .m3-info{color:#9aa0b8}.m3-pin{position:absolute;left:0;top:0;width:28px;height:28px;margin:-14px 0 0 -14px;border-radius:50%;background:#4f46e5;color:#fff;border:2px solid #fff;font:700 12.5px inherit;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 2px 8px #00000059;will-change:transform;transition:opacity .15s;z-index:2}.m3-pin.seen{background:#059669}.m3-pin.sel{box-shadow:0 0 0 4px #4f46e559,0 2px 8px #00000059}.m3-pin.seen.sel{box-shadow:0 0 0 4px #05966959,0 2px 8px #00000059}.m3-pin.hid{opacity:0;pointer-events:none}.m3-card{position:absolute;left:12px;right:12px;bottom:34px;max-width:440px;background:#fffffff7;color:#1b1e30;border-radius:12px;box-shadow:0 8px 28px #00000040;padding:12px 14px;z-index:3}.m3-card-h{display:flex;align-items:center;gap:8px}.m3-card-h b{flex:1;font-size:14.5px}.m3-card-h button{border:0;background:transparent;cursor:pointer;color:#6b7088;display:flex;padding:2px}.m3-card-b{margin-top:8px;font-size:13.5px;line-height:1.55;white-space:pre-wrap;max-height:180px;overflow:auto}.m3-card-b.muted{color:#8a90a6}.m3-num{width:22px;height:22px;border-radius:50%;background:#4f46e5;color:#fff;font:700 12px inherit;display:inline-flex;align-items:center;justify-content:center;flex:none;border:0}button.m3-num{cursor:pointer}.m3-hint{font-size:12px;color:var(--muted)}.m3-list-h{display:flex;align-items:center;justify-content:space-between;gap:10px;font-weight:700;font-size:13.5px;margin-bottom:8px;flex-wrap:wrap}.m3-list-h span{font-weight:600;font-size:12px;color:var(--muted)}.m3-chips{display:flex;flex-wrap:wrap;gap:8px}.m3-chip{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:99px;padding:5px 12px 5px 6px;font:600 13px inherit;cursor:pointer}.m3-chip.on{border-color:var(--primary);background:var(--primary-50)}.m3-chip.seen .m3-num{background:#059669}.m3-edit{border:1px solid var(--border);border-radius:14px;padding:14px;background:var(--surface-2)}.m3-row{display:flex;gap:10px;align-items:flex-start;padding:10px;border:1px solid var(--border);border-radius:12px;background:var(--surface);margin-bottom:8px}.m3-row.on{border-color:var(--primary)}.m3-row .m3-num{margin-top:8px}.m3-audio{display:flex;align-items:center;gap:10px;margin-top:8px;padding-top:8px;border-top:1px solid var(--border, #e5e7eb)}.m3-audio button{width:34px;height:34px;border-radius:50%;border:0;background:var(--primary, #4f46e5);color:#fff;display:grid;place-items:center;cursor:pointer;flex:none}.m3-audio span{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--muted, #6b7280)}.m3-apick{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.m3-apick audio{height:32px;max-width:260px}.m3-apick .nm{font-size:12px;color:var(--muted, #6b7280);max-width:180px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}#lesson-view{min-width:0;scroll-margin-top:76px}