:root {
  --bg: #0f1115;
  --panel: #1a1d24;
  --panel2: #22262f;
  --border: #2d323d;
  --text: #e8ebf0;
  --muted: #8b919b;
  --accent: #E8542B;
  --accent2: #3A7CA5;
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: -apple-system, "Noto Sans TC", "PingFang TC", sans-serif;
  background: var(--bg); color: var(--text); display: flex; min-height: 100vh;
}
aside#sidebar {
  width: 260px; min-width: 260px; background: var(--panel); border-right: 1px solid var(--border);
  padding: 16px; overflow-y: auto;
}
aside h1 { font-size: 16px; margin: 0 0 4px; }
aside label { display: block; font-size: 11px; color: var(--muted); margin: 14px 0 4px; text-transform: uppercase; letter-spacing: .5px; }
aside .row { display: flex; gap: 4px; }
aside input[type=date], aside select {
  background: var(--panel2); color: var(--text); border: 1px solid var(--border);
  border-radius: 6px; padding: 6px 8px; font-size: 12px; flex: 1; min-width: 0;
}
.chips { display: flex; flex-wrap: wrap; gap: 4px; }
.chip {
  background: var(--panel2); color: var(--muted); border: 1px solid var(--border);
  border-radius: 999px; padding: 4px 12px; font-size: 12px; cursor: pointer;
  user-select: none;
}
.chip.active { background: var(--accent); color: #fff; border-color: var(--accent); }
nav#nav { display: flex; flex-direction: column; gap: 2px; }
nav#nav button {
  text-align: left; background: none; border: none; color: var(--text);
  padding: 8px 10px; border-radius: 6px; font-size: 13px; cursor: pointer;
}
nav#nav button:hover { background: var(--panel2); }
nav#nav button.active { background: var(--accent); color: white; }
.muted, small { color: var(--muted); font-size: 12px; }
.drive-info { margin-top: 24px; padding-top: 12px; border-top: 1px solid var(--border); }
.drive-info a { color: var(--accent2); text-decoration: none; }

main#main { flex: 1; padding: 24px 32px; overflow-x: hidden; }
h2.page-title { margin: 0 0 4px; }
.caption { color: var(--muted); font-size: 12px; margin-bottom: 20px; }

.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin-bottom: 24px; }
.kpi {
  background: linear-gradient(180deg, var(--panel) 0%, #16181e 100%);
  border: 1px solid var(--border); border-radius: 12px;
  padding: 16px 18px;
  transition: border-color .15s;
}
.kpi:hover { border-color: var(--accent); }
.kpi .label { font-size: 11px; color: var(--muted); letter-spacing: .3px; }
.kpi .value { font-size: 28px; font-weight: 700; margin-top: 6px; font-variant-numeric: tabular-nums; letter-spacing: -.5px; }
.kpi .delta { font-size: 12px; margin-top: 2px; }
.kpi .delta.up { color: #5bc27e; }
.kpi .delta.down { color: #e06a6a; }

.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  padding: 20px 24px; margin-bottom: 24px;
  box-shadow: 0 1px 0 rgba(255,255,255,0.02), 0 8px 24px rgba(0,0,0,0.15);
}
.card h3 { margin: 0 0 14px; font-size: 15px; font-weight: 600; letter-spacing: .2px; }
.card .actions { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap; }

button.btn {
  background: var(--panel2); color: var(--text); border: 1px solid var(--border);
  border-radius: 6px; padding: 6px 12px; font-size: 12px; cursor: pointer;
}
button.btn:hover { background: var(--border); }
button.btn.primary { background: var(--accent); border-color: var(--accent); color: white; }

select, input[type=number], input[type=text] {
  background: var(--panel2); color: var(--text); border: 1px solid var(--border);
  border-radius: 6px; padding: 6px 10px; font-size: 13px;
}

table { width: 100%; border-collapse: collapse; font-size: 12px; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--border); }
th { background: var(--panel2); color: var(--muted); font-weight: 600; font-size: 11px; text-transform: uppercase; position: sticky; top: 0; }
tr:hover td { background: rgba(232, 84, 43, 0.05); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

.table-wrap { max-height: 500px; overflow: auto; border: 1px solid var(--border); border-radius: 6px; }

.row-inputs { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; align-items: end; }
.row-inputs > div { display: flex; flex-direction: column; gap: 4px; }
.row-inputs label { font-size: 11px; color: var(--muted); }

.plot { width: 100%; min-height: 400px; }

#loading { padding: 40px; color: var(--muted); }

.preset-row { margin-top: 4px; }
.preset-row .preset {
  flex: 1; background: var(--panel2); color: var(--muted); border: 1px solid var(--border);
  border-radius: 6px; padding: 4px 0; font-size: 11px; cursor: pointer;
}
.preset-row .preset:hover { color: var(--text); border-color: var(--accent); }

.highlight-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 20px; }
.highlight {
  background: var(--panel); border-left: 3px solid var(--accent); border-radius: 8px;
  padding: 14px 16px;
}
.highlight.good { border-left-color: #5bc27e; }
.highlight.bad { border-left-color: #e06a6a; }
.highlight h4 { margin: 0 0 8px; font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; }
.highlight .hl-item { font-size: 13px; margin-bottom: 4px; }
.highlight .hl-item .delta { font-size: 11px; color: var(--muted); margin-left: 6px; }

.score-good { color: #5bc27e; font-weight: 700; }
.score-mid { color: #d4a655; }
.score-bad { color: #e06a6a; }

.segment { display: inline-flex; border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.segment button {
  background: var(--panel2); color: var(--muted); border: none;
  padding: 6px 12px; font-size: 12px; cursor: pointer;
}
.segment button.active { background: var(--accent); color: white; }

.event-pill {
  display: inline-block; background: var(--panel2); border: 1px solid var(--border);
  border-radius: 999px; padding: 2px 10px; font-size: 11px; color: var(--muted);
}

.split-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 900px) { .split-2, .highlight-grid { grid-template-columns: 1fr; } }

.bench-note {
  display: inline-block; margin-left: 8px; font-size: 10px; color: var(--muted);
  background: var(--panel2); padding: 2px 6px; border-radius: 4px;
}

/* Tooltip for metric explanations */
.tip {
  display: inline-block; margin-left: 4px; width: 14px; height: 14px; line-height: 14px;
  text-align: center; border-radius: 50%; background: var(--panel2); color: var(--muted);
  font-size: 10px; cursor: help; position: relative;
}
.tip:hover::after {
  content: attr(data-tip); position: absolute; left: 20px; top: -4px;
  background: #000; color: #fff; padding: 6px 10px; border-radius: 4px;
  font-size: 12px; white-space: normal; width: 240px; z-index: 100;
  border: 1px solid var(--border);
}

/* Compare page */
.compare-candidates {
  max-height: 300px; overflow-y: auto; border: 1px solid var(--border);
  border-radius: 6px; padding: 6px;
}
.cand-item {
  display: flex; gap: 8px; padding: 6px 8px; border-radius: 4px; cursor: pointer;
  align-items: flex-start; font-size: 12px;
}
.cand-item:hover { background: var(--panel2); }
.cand-item.selected { background: rgba(232, 84, 43, 0.15); border-left: 3px solid var(--accent); }
.cand-item input { margin-top: 2px; }
.cand-meta { color: var(--muted); font-size: 11px; }

.compare-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.compare-table th, .compare-table td { padding: 10px 12px; border-bottom: 1px solid var(--border); }
.compare-table th:first-child, .compare-table td:first-child {
  background: var(--panel2); font-weight: 600; color: var(--muted); text-align: left; min-width: 140px;
}
.compare-table td { text-align: right; font-variant-numeric: tabular-nums; }
.compare-table td.best { background: rgba(91, 194, 126, 0.1); color: #5bc27e; font-weight: 700; }
.compare-table td.worst { background: rgba(224, 106, 106, 0.08); color: #e06a6a; }
.compare-table .col-head { text-align: center; font-size: 12px; }

.insight-box {
  background: var(--panel2); border-left: 3px solid var(--accent2);
  padding: 10px 14px; margin: 8px 0; border-radius: 4px; font-size: 13px;
}