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.src{color:var(--ink);font-size:13.5px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.cb-media-info .meta{color:var(--ink-muted);display:flex;font-size:11.5px;gap:10px}.cb-media-info .meta span{align-items:center;display:inline-flex;gap:4px}.cb-media-empty{background:var(--bg-paper);border:2px dashed var(--line);border-radius:var(--radius-md);color:var(--ink-muted);cursor:pointer;font-size:13px;padding:16px;text-align:center}.cb-media-empty:hover{border-color:var(--accent);color:var(--accent)}.cb-media-empty input[type=file]{display:none}.cb-meta{align-items:stretch;border-left:1px solid var(--line);display:flex;flex-direction:column;gap:8px;max-width:110px;min-width:110px;padding:10px}.cb-duration{align-items:center;background:var(--bg-paper);border:1px solid var(--line);border-radius:8px;display:flex;gap:6px;padding:6px 8px}.cb-duration input{background:transparent;border:none;color:var(--ink);font-family:var(--font-display);font-size:16px;font-weight:500;outline:none;padding:0;text-align:right;width:38px}.cb-duration label{color:var(--ink-muted);font-size:11px;font-weight:600}.cb-actions{display:grid;gap:4px;grid-template-columns:1fr 1fr}.cb-icon-btn{background:#fff;border:1px solid var(--line);border-radius:6px;color:var(--ink-soft);cursor:pointer;display:grid;height:28px;padding:0;place-items:center;width:28px}.cb-icon-btn:hover{border-color:var(--ink-muted);color:var(--ink)}.cb-icon-btn.danger:hover{border-color:#b94e3a;color:#b94e3a}.cb-icon-btn svg{height:14px;width:14px}.add-between{align-items:center;display:flex;height:12px;justify-content:center;margin:-6px 0;opacity:0;position:relative;transition:opacity .12s ease}.canvas-blocks:hover .add-between{opacity:1}.add-between:before{background:var(--accent);content:"";height:1px;left:0;opacity:.3;position:absolute;right:0;top:50%}.add-between button{background:var(--accent);border:none;border-radius:50%;color:#fff;cursor:pointer;display:grid;font-size:16px;font-weight:700;height:24px;place-items:center;position:relative;width:24px;z-index:1}.builder-rail{display:flex;flex-direction:column;gap:16px;overflow-y:auto;padding-bottom:40px;scrollbar-width:none}.builder-rail::-webkit-scrollbar{display:none}.summary-card{background:var(--bg-paper);border:1px solid var(--line);border-radius:var(--radius-lg);padding:18px}.summary-card h4{font-family:var(--font-display);font-size:15px;font-weight:600;letter-spacing:-.01em;margin:0 0 5px}.summary-row{align-items:baseline;border-bottom:1px dashed var(--line);display:flex;font-size:13px;justify-content:space-between;padding:6px 0}.summary-row:last-child{border-bottom:none}.summary-row span.label{color:var(--ink-muted)}.summary-row span.val{color:var(--ink);font-family:var(--font-display);font-weight:600}.summary-row span.val.warn{color:#c46a4a}.timeline-mini{background:var(--line-soft);border-radius:6px;display:flex;height:24px;margin-top:12px;overflow:hidden}.timeline-mini div{border-right:1px solid #fff;height:100%}.timeline-mini div:last-child{border-right:none}.builder-actions{display:flex;flex-direction:column;gap:8px}.builder-actions button{align-items:center;border-radius:var(--radius-md);cursor:pointer;display:flex;font-family:inherit;font-size:13.5px;font-weight:700;gap:8px;justify-content:center;padding:12px;width:100%}.builder-actions .save{background:var(--accent);border:1px solid var(--accent);color:#fff}.builder-actions .save:hover{background:var(--accent-ink)}.builder-actions .secondary{background:#fff;border:1px solid var(--line);color:var(--ink)}.builder-actions .secondary:hover{background:var(--bg-paper)}.builder-actions svg{height:14px;width:14px}.modal-backdrop{-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);background:#2b262066;display:grid;inset:0;padding:20px;place-items:center;position:fixed;z-index:1000}.modal{background:#fff;border-radius:var(--radius-lg);box-shadow:0 20px 60px #00000040;display:flex;flex-direction:column;max-height:90vh;max-width:540px;overflow:hidden;width:100%}.modal-head{align-items:center;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;padding:20px 24px}.modal-head h3{font-family:var(--font-display);font-size:20px;font-weight:500;letter-spacing:-.01em;margin:0}.modal-close{background:#fff;border:1px solid var(--line);border-radius:8px;color:var(--ink-muted);cursor:pointer;display:grid;height:32px;padding:0;place-items:center;width:32px}.modal-close:hover{background:var(--bg-paper);color:var(--ink)}.modal-body{overflow-y:auto;padding:24px}.modal-tabs{border-bottom:1px solid var(--line);display:flex;gap:4px;padding:0 24px}.modal-tab{align-items:center;background:transparent;border:none;border-bottom:2px solid transparent;color:var(--ink-muted);cursor:pointer;display:flex;font-family:inherit;font-size:13px;font-weight:600;gap:6px;padding:12px 14px}.modal-tab.active{border-bottom-color:var(--accent);color:var(--accent)}.modal-tab svg{height:14px;width:14px}.upload-zone{border:2px dashed var(--line);border-radius:var(--radius-md);cursor:pointer;padding:36px 20px;text-align:center;transition:all .15s ease}.upload-zone.dragover,.upload-zone:hover{background:var(--accent-soft);border-color:var(--accent)}.upload-zone svg{color:var(--accent);height:32px;margin-bottom:8px;width:32px}.upload-zone strong{display:block;font-family:var(--font-display);font-size:18px;font-weight:500;margin-bottom:4px}.upload-zone span{color:var(--ink-muted);font-size:12.5px}.upload-zone input{display:none}.url-input{border:1px solid var(--line);border-radius:var(--radius-md);font-family:inherit;font-size:14px;outline:none;padding:12px 14px;width:100%}.url-input:focus{border-color:var(--accent)}.library-grid{display:grid;gap:10px;grid-template-columns:repeat(2,1fr)}.library-item{align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);cursor:pointer;display:flex;gap:10px;padding:10px}.library-item:hover{background:var(--accent-soft);border-color:var(--accent)}.library-item .cb-media-thumb{font-size:9px;height:32px;width:44px}.library-item .lib-info{min-width:0}.library-item .lib-name{color:var(--ink);font-size:13px;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.library-item .lib-meta{color:var(--ink-muted);font-size:11px}.modal-foot{border-top:1px solid var(--line);display:flex;gap:8px;justify-content:flex-end;padding:16px 24px}.modal-foot button{border-radius:var(--radius-md);cursor:pointer;font-family:inherit;font-size:13px;font-weight:600;padding:10px 18px}.modal-foot .cancel{background:#fff;border:1px solid var(--line);color:var(--ink)}.modal-foot .confirm{background:var(--accent);border:1px solid var(--accent);color:#fff}.modal-foot .confirm:disabled{cursor:not-allowed;opacity:.5}.snackbar{align-items:center;animation:snackin .2s ease;background:var(--ink);border-radius:var(--radius-md);bottom:24px;box-shadow:0 8px 24px #0003;color:#fff;display:flex;font-size:13.5px;font-weight:600;gap:10px;left:50%;padding:12px 18px;position:fixed;transform:translate(-50%);z-index:1100}@keyframes snackin{0%{opacity:0;transform:translate(-50%,20px)}to{opacity:1;transform:translate(-50%)}}@media(max-width:1280px){.builder-body{gap:16px;grid-template-columns:280px 1fr 280px;padding:20px}}@media(max-width:1080px){.builder-body{grid-template-columns:240px 1fr}.builder-rail{display:none}}@media(max-width:760px){.builder-body{grid-template-columns:1fr;padding:16px}.builder-toolbar{overflow-y:visible}.builder-canvas,.builder-rail{overflow-y:visible;padding-bottom:0}.lesson-meta-card .field-row{grid-template-columns:1fr}}