:root{--bv-bg: #ffffff;--bv-bg-2: #f7f8fb;--bv-bg-3: #eef3ff;--bv-ink: #111827;--bv-ink-2: #374151;--bv-ink-3: #6b7280;--bv-ink-4: #a8b0bd;--bv-line: #e5e7eb;--bv-line-2: #d1d7e0;--bv-canvas: #fbfcff;--bv-dot: rgba(31, 41, 55, .14);--bv-shadow: 0 1px 2px rgba(15,23,42,.04), 0 8px 24px rgba(15,23,42,.06);--bv-shadow-lg: 0 8px 28px rgba(15,23,42,.1);--bv-accent: #3f6df6;--bv-pad-h: 16px;--bv-radius-card: 10px;--bv-radius-zone: 16px;--bv-radius-pill: 999px;--bv-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;--bv-sans: "Helvetica Neue", "Helvetica", "Arial", system-ui, -apple-system, sans-serif}:root[data-tone=cool]{--bv-bg: oklch(.985 .004 240);--bv-bg-2: oklch(.962 .006 240);--bv-bg-3: oklch(.94 .008 240);--bv-canvas: oklch(.975 .005 240)}:root[data-tone=neutral]{--bv-bg: oklch(.985 0 0);--bv-bg-2: oklch(.965 0 0);--bv-bg-3: oklch(.945 0 0);--bv-canvas: oklch(.975 0 0)}:root[data-theme=dark]{--bv-bg: oklch(.18 .005 60);--bv-bg-2: oklch(.21 .006 60);--bv-bg-3: oklch(.25 .008 60);--bv-ink: oklch(.95 .005 60);--bv-ink-2: oklch(.78 .006 60);--bv-ink-3: oklch(.6 .005 60);--bv-ink-4: oklch(.45 .005 60);--bv-line: oklch(.35 .006 60 / .85);--bv-line-2: oklch(.3 .006 60 / .65);--bv-canvas: oklch(.16 .005 60);--bv-dot: oklch(.4 .005 60 / .45);--bv-shadow: 0 1px 2px rgba(0,0,0,.4), 0 4px 16px rgba(0,0,0,.4);--bv-shadow-lg: 0 2px 4px rgba(0,0,0,.4), 0 20px 50px rgba(0,0,0,.5)}*{box-sizing:border-box}html,body{height:100%;margin:0}body{font-family:var(--bv-sans);color:var(--bv-ink);background:var(--bv-bg);font-size:13px;line-height:1.45;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow:hidden}button{font-family:inherit;color:inherit}.bv-app{display:flex;flex-direction:column;height:100vh;width:100vw;background:var(--bv-bg);color:var(--bv-ink)}.bv-workspace{flex:1;min-width:0;min-height:0;display:flex;flex-direction:column}.bv-rail{width:52px;flex:0 0 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#0f172a08;margin-bottom:8px}.bv-task-dot{width:7px;height:7px;border-radius:2px;flex-shrink:0}.bv-task-title{flex:1;min-width:0;font-size:12px;font-weight:400;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.bv-task-title.done{text-decoration:line-through;color:var(--bv-ink-4)}.bv-task-meta{font-family:var(--bv-mono);font-size:9.5px;color:var(--bv-ink-3)}.bv-task-more{font-size:11px;color:var(--bv-ink-3);padding:2px 6px}.bv-task-stack{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}.bv-task-sub{display:flex;gap:6px;font-family:var(--bv-mono);font-size:9.5px;color:var(--bv-ink-3)}.bv-task-avs{display:flex;align-items:center;gap:0}.bv-task-avs>*{margin-left:-4px;box-shadow:0 0 0 1.5px var(--bv-bg-2)}.bv-task-avs>*:first-child{margin-left:0}.bv-sortbar{display:flex;gap:6px;padding:4px 0 10px}.bv-sortbar button{display:inline-flex;align-items:center;gap:4px;height:28px;padding:0 10px;background:#fff;border:1px solid var(--bv-line);border-radius:7px;color:var(--bv-ink-3);font-size:11px;cursor:pointer;font-family:var(--bv-sans)}.bv-sortbar button.on{background:#eef3ff;color:#315cf6;border-color:#c7d5ff}.bv-empty{padding:24px 12px;text-align:center;color:var(--bv-ink-3);font-size:12px}.bv-add-proj{margin-top:8px;display:flex;align-items:center;gap:6px;width:100%;padding:8px;background:transparent;border:1px dashed var(--bv-line);border-radius:6px;color:var(--bv-ink-3);cursor:pointer;font-size:12px}.bv-add-proj:hover{color:var(--bv-ink);border-color:var(--bv-ink-3)}.bv-side-ft{display:flex;align-items:center;gap:10px;padding:10px 12px;border-top:1px solid var(--bv-line);background:var(--bv-bg-2)}.bv-side-ft-meta{flex:1;min-width:0;line-height:1.25}.bv-side-ft-meta>div:first-child{font-size:12px;font-weight:500}.bv-side-ft-meta>div:last-child{font-size:10px;color:var(--bv-ink-3);font-family:var(--bv-mono)}.bv-main{position:relative;min-width:0;min-height:0;display:flex;background:var(--bv-canvas)}.bv-canvas-wrap{position:relative;flex:1;overflow:hidden;cursor:default;-webkit-user-select:none;user-select:none}.bv-canvas-wrap.tool-hand{cursor:grab}.bv-canvas-wrap.tool-hand.panning{cursor:grabbing}.bv-canvas-wrap.tool-pencil,.bv-canvas-wrap.tool-arrow,.bv-canvas-wrap.tool-card,.bv-canvas-wrap.tool-field{cursor:crosshair}.bv-canvas-wrap.tool-text{cursor:text}.bv-canvas-wrap.tool-eraser{cursor:cell}.bv-grid{position:absolute;inset:0;background-image:radial-gradient(circle,var(--bv-dot) 1px,transparent 1.2px);pointer-events:none}.bv-world{position:absolute;left:0;top:0;transform-origin:0 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