:root{color-scheme:dark;--bg: #111317;--bg-deep: #0b0d10;--panel: #181b21;--panel-raised: #14181f;--line: #2f3643;--line-soft: rgba(47, 54, 67, .55);--text: #dbe2ee;--muted: #94a0b8;--subtle: #6b7280;--accent: #3f8cff;--accent-soft: rgba(63, 140, 255, .16);--sig-voltage: #22c55e;--sig-current: #f59e0b;--sig-power: #a855f7;--sig-temp: #ef4444;--sig-vshunt: #06b6d4;--sig-charge: #f97316;--sig-energy: #3b82f6;--voltage: var(--sig-voltage);--current: var(--sig-current);--power: var(--sig-power);--ok: #22c55e;--warn: #f59e0b;--err: #ef4444;--info: #3f8cff;--radius-sm: 6px;--radius-md: 8px;--radius-lg: 10px;--space-1: 4px;--space-2: 6px;--space-3: 8px;--space-4: 10px;--space-5: 12px;--space-6: 14px;--space-7: 16px;--font-sans: Inter, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-sans);min-height:100vh}.topbar,.topbar h1,.meta,.track-control-row,.track-control-title,.track-item,.track-item label,.timeline-panel-header,.timeline-panel-title,.timeline-panel-meta,.timeline-panel-drag-handle,.timeline-panel-toggle,.status-row,button,.file-button,select,.chart-area,.timeline-stack,.timeline-panel,.timeline-panel-chart{user-select:none;-webkit-user-select:none}#root{min-height:100vh}.topbar{padding:12px 16px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:12px;background:var(--bg-deep)}.topbar h1{margin:0;font-size:18px;font-weight:600}.controls{display:flex;align-items:center;gap:8px}.file-button,button,select{border:1px solid var(--line);background:var(--panel);color:var(--text);border-radius:8px;padding:8px 12px;cursor:pointer;font-size:13px;transition:border-color 80ms ease-out}.file-button:hover,button:hover,select:hover{border-color:var(--accent)}.file-button:focus-visible,button:focus-visible,select:focus-visible{outline:none;border-color:var(--accent);box-shadow:0 0 0 2px var(--accent-soft)}#json-file{display:none}.meta{padding:10px 16px;border-bottom:1px solid var(--line);color:var(--muted);font-size:13px;font-family:var(--font-mono)}.track-control-row{padding:10px 16px;border-bottom:1px solid var(--line);display:flex;gap:14px;align-items:center;flex-wrap:wrap}.track-control-title{color:var(--muted);font-size:13px}.track-list{display:flex;gap:8px;list-style:none;margin:0;padding:0;flex-wrap:wrap}.track-item{border:1px solid var(--line);border-radius:8px;padding:6px 10px;background:var(--panel);cursor:grab;-webkit-user-select:none;user-select:none}.track-item:active{cursor:grabbing}.track-item label{display:inline-flex;align-items:center;gap:8px;font-size:12px}.track-dot{width:10px;height:10px;border-radius:50%;display:inline-block}.track-item:hover{border-color:var(--accent);transition:border-color 80ms ease-out}.chart-area{padding:12px}.timeline-stack{width:100%;min-height:min(78vh,740px);border:1px solid var(--line);border-radius:10px;background:var(--panel);padding:10px;display:grid;gap:10px}.timeline-panel{border:1px solid rgba(63,140,255,.16);border-radius:10px;background:linear-gradient(180deg,#14181ff5,#111317f5);overflow:hidden}.timeline-panel-header{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 12px;border-bottom:1px solid rgba(47,54,67,.8)}.timeline-panel-collapsed .timeline-panel-header{border-bottom:0}.timeline-panel-dragging{opacity:.72;border-color:var(--accent)}.timeline-panel-heading,.timeline-panel-actions{display:inline-flex;align-items:center;gap:8px;min-width:0}.timeline-panel-heading{flex:1 1 auto}.timeline-panel-actions{flex:0 0 auto}.timeline-panel-title{font-size:13px;font-weight:600;color:var(--text);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.timeline-panel-meta{font-size:12px;color:var(--muted);font-family:var(--font-mono)}.timeline-panel-drag-handle,.timeline-panel-toggle{width:24px;height:24px;border-radius:var(--radius-sm);padding:0;display:inline-flex;align-items:center;justify-content:center;color:var(--muted);font-family:var(--font-mono);font-size:12px;line-height:1}.timeline-panel-drag-handle{cursor:grab}.timeline-panel-drag-handle:active{cursor:grabbing}.timeline-panel-toggle{font-weight:600}.timeline-panel-chart{height:min(34vh,320px);padding:8px 10px 12px}.timeline-empty{width:100%;min-height:min(78vh,740px);display:flex;align-items:center;justify-content:center;padding:40px}.timeline-empty-card{border:1px dashed var(--line);border-radius:var(--radius-lg);padding:36px 48px;display:flex;flex-direction:column;align-items:center;gap:10px;background:var(--panel)}.timeline-empty-title{font-size:15px;font-weight:600}.timeline-empty-sub{color:var(--muted);font-size:13px}.timeline-empty-hint{color:var(--subtle);font-size:11px;font-family:var(--font-mono);margin-top:4px}.status-row{border-top:1px solid var(--line);color:var(--muted);padding:10px 16px;font-size:12px;font-family:var(--font-mono)}.track-label{fill:var(--muted);font-size:12px;dominant-baseline:middle}.axis-label{fill:var(--muted);font-size:11px}.axis-line,.grid-line{stroke:var(--line);stroke-width:1}.axis-line-minor{stroke:var(--line);stroke-width:1.1;opacity:.45}.grid-line{opacity:.55}.hover-line{stroke:#6b7280;stroke-width:1;stroke-dasharray:4 3}.legend{font-size:12px;fill:var(--muted)}