:root{color-scheme:dark;--bg: #111317;--panel: #181b21;--line: #2f3643;--text: #dbe2ee;--muted: #94a0b8;--accent: #3f8cff;--voltage: #22c55e;--current: #f59e0b;--power: #a855f7}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,Segoe UI,Roboto,Helvetica,Arial,sans-serif;min-height:100vh}#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:#0f1115}.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}.file-button:hover,button:hover,select:hover{border-color:var(--accent)}#json-file{display:none}.meta{padding:10px 16px;border-bottom:1px solid var(--line);color:var(--muted);font-size:13px}.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}.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-title{font-size:13px;font-weight:600;color:var(--text)}.timeline-panel-meta{font-size:12px;color:var(--muted)}.timeline-panel-chart{height:min(34vh,320px);padding:8px 10px 12px}.timeline-empty{width:100%;height:min(78vh,740px);display:flex;align-items:center;justify-content:center;color:#94a0b8;font-size:16px}.status-row{border-top:1px solid var(--line);color:var(--muted);padding:10px 16px;font-size:12px}.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)}