:root{--font-sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "JetBrains Mono", "SF Mono", ui-monospace, SFMono-Regular, monospace;--bg-canvas: #f7f6f3;--dot-grid: #dddad1;--ink-primary: #141413;--ink-secondary: #6e6d68;--ink-muted: #9b9992;--surface-hud: rgba(255, 255, 255, .92);--surface-hud-hover: #f2f1ed;--surface-hud-active: #141413;--ink-on-active: #ffffff;--border-hairline: rgba(20, 20, 19, .1);--border-strong: rgba(20, 20, 19, .18);--shadow-subtle: 0 2px 10px rgba(20, 20, 19, .06);--accent: #2563eb;--accent-soft: rgba(37, 99, 235, .1);--danger: #dc2626;--danger-soft: rgba(220, 38, 38, .1)}[data-theme=dark]{--bg-canvas: #111113;--dot-grid: #25252a;--ink-primary: #f4f4f2;--ink-secondary: #a1a1aa;--ink-muted: #71717a;--surface-hud: rgba(24, 24, 27, .9);--surface-hud-hover: rgba(255, 255, 255, .08);--surface-hud-active: #f4f4f2;--ink-on-active: #111113;--border-hairline: rgba(255, 255, 255, .1);--border-strong: rgba(255, 255, 255, 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var(--border-hairline);color:var(--ink-secondary)}.board-root{position:relative;width:100%;height:100%;overflow:hidden;background:var(--bg-canvas)}.board-canvas{display:block;width:100%;height:100%;touch-action:none}.empty-state{position:fixed;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;pointer-events:none;z-index:5;padding:24px}.empty-state-inner{display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center;max-width:340px;color:var(--ink-secondary)}.empty-state-icon{width:38px;height:38px;border-radius:10px;border:1px solid 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var(--border-hairline);box-shadow:var(--shadow-subtle);font-size:12px}.confirm-popover{display:flex;align-items:center;gap:8px}.confirm-text{color:var(--ink-primary);font-weight:500;margin-right:4px}.mini-btn{height:26px;padding:0 10px;border-radius:6px;font-size:12px;font-weight:500;border:1px solid var(--border-hairline);color:var(--ink-secondary);transition:background-color .14s ease,color .14s 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