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0}.create-confirm{background:var(--accent);color:#fff;border:none}.create-confirm:disabled{opacity:.4;cursor:not-allowed}.card-image{border-radius:var(--radius-sm);max-width:100%;display:block}.card-media{border-radius:var(--radius-sm);object-fit:contain;background:#000;width:100%;height:100%;min-height:240px;display:block}.card-audio{flex-direction:column;gap:10px;padding:12px 0;display:flex}.card-doc-wrap{flex-direction:column;height:100%;display:flex;position:relative}.card-doc-wrap .card-media{flex:1;min-height:0}.card-doc-fallback{color:var(--text-muted);border-top:1px solid var(--border-light);background:var(--bg-card);flex-shrink:0;justify-content:center;align-items:center;gap:14px;padding:8px;font-size:12px;display:flex}.card-doc-fallback a{color:var(--accent);font-weight:500;text-decoration:none}.card-doc-fallback a:hover{text-decoration:underline}.card-doc-fallback .doc-open-btn{background:var(--accent);color:#fff;border-radius:6px;padding:6px 14px;font-weight:600}.card-doc-fallback .doc-open-btn:hover{opacity:.9;text-decoration:none}.whiteboard-canvas{width:100%;height:100%;min-height:280px;position:relative}.draft-badge{color:#fff;background:linear-gradient(135deg,#2563eb,#7c3aed);border-radius:4px;flex-shrink:0;padding:1px 5px;font-size:10px}.fixed-item .always-show{opacity:.5;font-size:11px;font-weight:400}@media (width<=768px){:root{--nav-height:44px;--toolbar-height:50px;--panel-width:100%}.timeline-nav{padding:0 8px}.timeline-brand .nav-title{max-width:120px;font-size:13px}.timeline-brand .nav-meta{display:none}.timeline-track{max-width:35vw}.dot-label{display:none}.main-area{top:44px;bottom:50px}.content-card{min-width:200px}.content-card.maximized{width:100vw;height:calc(100vh - 94px);top:44px;left:0}.right-panel{max-height:60vh;box-shadow:0 -6px 20px #00000026;width:100%!important;max-width:100%!important;inset:auto 0 50px!important}.right-panel.open{border-radius:12px 12px 0 0}.panel-toggle{top:-28px;right:12px}.bottom-toolbar.floating{gap:4px;padding:6px 8px}.bottom-toolbar.floating button{padding:6px 8px;font-size:16px}.bottom-toolbar.floating.pos-left,.bottom-toolbar.floating.pos-right{max-height:calc(100vh - 120px)}.login-box{width:88vw;padding:28px 22px}.create-type-tabs{flex-wrap:nowrap;overflow-x:auto}.create-type-tab{flex:none;min-width:80px}.create-file-label{border:2px dashed var(--border);text-align:center;border-radius:8px;padding:14px;font-size:13px}.create-file-btn{height:52px;font-size:16px}.card-edge-handle{width:18px}.card-bottom-handle{height:18px}.card-corner-handle{width:28px;height:28px}.card-header{min-height:40px}}.create-file-btns{gap:8px;display:flex}.create-file-btn{cursor:pointer;border:1px solid var(--border);background:var(--bg-2);height:44px;color:inherit;border-radius:8px;flex:1;justify-content:center;align-items:center;font-size:14px;font-weight:600;display:flex;position:relative;overflow:hidden}.create-file-btn.label input{opacity:0;cursor:pointer;width:100%;height:100%;position:absolute;inset:0}.course-box{flex-direction:column;gap:12px;display:flex}.course-box .login-btn{width:100%}.course-loaded{color:var(--text-secondary);text-align:center;font-size:13px}.course-code{letter-spacing:12px;text-align:center;color:var(--accent);background:var(--accent-bg,#eef2ff);font-variant-numeric:tabular-nums;border-radius:12px;padding:14px 8px;font-size:48px;font-weight:800}.course-hint{color:var(--text-muted);text-align:center;font-size:12px}.course-logout{color:var(--text-muted);cursor:pointer;background:0 0;border:none;margin-top:4px;padding:4px;font-size:12px}.course-logout:hover{color:var(--text-primary)}.selection-toolbar{left:50%;bottom:calc(var(--toolbar-height,50px) + 16px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border);z-index:500;background:#fffffff2;border-radius:12px;align-items:center;gap:10px;padding:8px 14px;animation:.18s fadeSlideIn;display:flex;position:fixed;transform:translate(-50%);box-shadow:0 8px 24px #00000026}.selection-toolbar .selection-info{color:var(--text-muted);border-right:1px solid var(--border);padding-right:4px;font-size:12px}.selection-btn{border:1px solid var(--border);cursor:pointer;background:#fff;border-radius:8px;height:34px;padding:0 14px;font-size:13px;font-weight:600;transition:all .15s}.selection-btn:hover{background:var(--border-light)}.selection-btn.primary{color:#fff;background:linear-gradient(135deg,#2563eb,#7c3aed);border-color:#0000}.selection-btn.primary:hover{transform:translateY(-1px);box-shadow:0 4px 12px #2563eb40}.selection-btn.danger{color:#dc2626;background:#fef2f2;border-color:#fecaca}.selection-btn.danger:hover{background:#fee2e2}@media (width<=768px){.selection-toolbar{bottom:calc(var(--toolbar-height,50px) + 10px);flex-wrap:wrap;justify-content:center;left:8px;right:8px;transform:none}.selection-btn{flex:1;min-width:0;height:38px;padding:0 8px;font-size:12px}}@keyframes magicFade{0%,65%{opacity:1}to{opacity:0}}.stroke-magic{animation:6s linear forwards magicFade}.annot-selected{filter:drop-shadow(0 0 4px #2563eb)}.ai-btn{color:#7c3aed;opacity:1;white-space:nowrap;background:#f5f3ff;border:1px solid #ddd6fe;border-radius:6px;width:auto;height:24px;padding:0 9px;font-size:11px;font-weight:600}.ai-btn:hover{background:#ede9fe}.ai-btn:disabled{opacity:.5;cursor:default}.ai-explain-btn{background:linear-gradient(135deg,#8b5cf6,#2563eb)}.chat-pin{border:1px solid var(--border);color:var(--text-secondary);cursor:pointer;background:#fff;border-radius:6px;margin-top:6px;margin-left:6px;padding:2px 8px;font-size:11px;display:inline-block}.chat-pin:hover{background:var(--border-light);color:var(--text-primary)}