*{box-sizing:border-box}:root{--bg: #f4f5f7;--surface: #ffffff;--surface2: #eceef1;--text: #1a1d21;--text-dim: #6b7280;--border: #d8dce2;--accent: #2563eb;--accent-soft: #dbeafe;--danger: #dc2626;--ink-default: #1a1d21;--canvas-bg: #fafbfc;--grid-dot: #d5d9df;--shadow: 0 2px 8px rgba(0,0,0,.08);--shadow-lg: 0 8px 30px rgba(0,0,0,.16)}[data-theme=dark]{--bg: #111418;--surface: #1b1f26;--surface2: #242a33;--text: #e8eaed;--text-dim: #9aa2ad;--border: #333a45;--accent: #4f8df9;--accent-soft: #1e3a5f;--danger: #f87171;--ink-default: #e8eaed;--canvas-bg: #14171c;--grid-dot: #2a3038;--shadow: 0 2px 8px rgba(0,0,0,.4);--shadow-lg: 0 8px 30px rgba(0,0,0,.55)}html,body,#root{margin:0;height:100%;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:15px}button{font:inherit;color:inherit;background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:7px 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0}.userbtn{width:34px;height:34px;border-radius:50%;background:var(--accent);color:#fff;border:none;font-weight:700;cursor:pointer;flex-shrink:0}.menu-pop{position:absolute;top:52px;right:16px;background:var(--surface);border:1px solid var(--border);border-radius:12px;box-shadow:var(--shadow-lg);z-index:150;padding:6px;min-width:220px;display:flex;flex-direction:column}.menu-pop button{border:none;background:none;text-align:left;justify-content:flex-start;padding:9px 12px;border-radius:8px}.menu-pop button:hover{background:var(--surface2)}.menu-pop .who{padding:8px 12px;border-bottom:1px solid var(--border);margin-bottom:4px}.menu-pop .who b{display:block}.table-editor{display:grid;gap:1px;background:var(--border);border:1px solid var(--border);overflow:auto;max-height:55vh}.table-editor input{border:none;border-radius:0;padding:6px 8px;font-size:13px;min-width:90px}@media (max-width: 640px){.toolbar{bottom:8px;padding:6px;gap:4px}.board-topbar 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var(--accent);outline-offset:2px;border-radius:8px}.wb-model .rotate-canvas{width:100%;height:100%;display:block;touch-action:none;cursor:grab;border-radius:8px}.wb-model .label{font-size:12px;color:var(--text-dim);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.model-rot-btn{position:absolute;top:-14px;right:-14px;z-index:6;width:32px;height:32px;padding:0;border-radius:50%;box-shadow:var(--shadow-lg)}.model-status{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;color:var(--text-dim);font-size:13px;border:1px dashed var(--border);border-radius:8px}.board-shell.write-mode .wb-model{pointer-events:none}.model-viewer{width:min(860px,94vw);background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:12px;display:flex;flex-direction:column;gap:10px;position:relative}.model-canvas{width:100%;height:min(60vh,540px);display:block;touch-action:none;cursor:grab;background:var(--canvas-bg);background-image:radial-gradient(var(--grid-dot) 1px,transparent 1px);background-size:18px 18px;border:1px solid var(--border);border-radius:10px}.model-viewer .model-status{top:12px;right:12px;bottom:58px;left:12px;border:none}.model-caption{display:flex;align-items:center;gap:10px}.model-caption span:first-child{font-weight:600;flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.rot-panel{position:absolute;left:50%;transform:translate(-50%);top:calc(100% + 8px);display:flex;gap:8px;background:var(--surface);border:1px solid var(--border);border-radius:10px;box-shadow:var(--shadow-lg);padding:6px 8px;z-index:7}.rot-panel label{display:flex;align-items:center;gap:5px}.rot-panel 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