:root {
  --bg: #0c1117;
  --bg-elev: #161b22;
  --fg: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --border: #21262d;
  --warn: #f0883e;
  --green: #2ea043;
  --red: #f85149;
  --pink: #d2a8ff;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 14px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC",
         "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--fg);
  background: var(--bg);
}
header { padding: 28px 32px 0; border-bottom: 1px solid var(--border); }
h1 { margin: 0 0 4px; font-size: 22px; font-weight: 600; }
.subtitle { margin: 0 0 18px; color: var(--muted); font-size: 13px; }

nav#tabs { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: -1px; }
nav#tabs a {
  padding: 8px 14px; color: var(--muted); border-bottom: 2px solid transparent;
  text-decoration: none; font-size: 13px;
}
nav#tabs a:hover { color: var(--fg); }
nav#tabs a.active { color: var(--fg); border-bottom-color: var(--accent); }

main { padding: 28px 32px 64px; max-width: 1400px; margin: 0 auto; }
section { display: none; }
section.active { display: block; }
section h2 { margin: 0 0 8px; font-size: 22px; }
section h3 { margin-top: 32px; font-size: 16px; }
section p { color: #cdd5dd; }

table {
  border-collapse: collapse; width: 100%;
  margin: 12px 0; font-variant-numeric: tabular-nums; font-size: 13px;
}
th, td {
  padding: 7px 12px; border-bottom: 1px solid var(--border); text-align: right;
}
th:first-child, td:first-child, th:nth-child(2), td:nth-child(2),
th:nth-child(3), td:nth-child(3) { text-align: left; }
th { font-weight: 600; color: var(--muted); background: var(--bg); position: sticky; top: 0; }
tr:hover td { background: var(--bg-elev); }

.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin: 20px 0 8px; }
.kpi { background: var(--bg-elev); padding: 16px 18px; border-left: 3px solid var(--accent); border-radius: 4px; }
.kpi .label { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: 0.04em; }
.kpi .value { font-size: 26px; font-weight: 600; margin-top: 4px; font-variant-numeric: tabular-nums; }
.kpi.warn { border-left-color: var(--warn); }
.kpi.bad { border-left-color: var(--red); }
.kpi.good { border-left-color: var(--green); }

.caveat {
  background: rgba(240, 136, 62, 0.08);
  border-left: 3px solid var(--warn);
  padding: 14px 18px; margin: 16px 0; font-size: 13px;
  border-radius: 0 4px 4px 0;
}
.callout {
  background: rgba(88, 166, 255, 0.08);
  border-left: 3px solid var(--accent);
  padding: 14px 18px; margin: 16px 0;
  border-radius: 0 4px 4px 0;
}
select, button {
  background: var(--bg-elev); color: var(--fg);
  border: 1px solid var(--border); padding: 5px 10px;
  font-size: 13px; border-radius: 4px;
}
select { min-width: 280px; }
.chart { width: 100%; min-height: 440px; margin: 16px 0; background: var(--bg); }
.chart-tall { min-height: 540px; }
.row { display: flex; gap: 16px; align-items: center; margin: 12px 0; flex-wrap: wrap; }
.row label { color: var(--muted); }

.pos { color: var(--green); }
.neg { color: var(--red); }
.muted { color: var(--muted); }
.sig { font-weight: 600; color: var(--green); }
.nosig { color: var(--muted); }

footer {
  padding: 16px 32px;
  color: var(--muted); border-top: 1px solid var(--border);
  font-size: 12px;
}
ul { padding-left: 22px; }
ul li { margin: 4px 0; }
code {
  background: var(--bg-elev);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 12px;
}
.legend-row { display: flex; gap: 18px; flex-wrap: wrap; color: var(--muted); font-size: 12px; }
.legend-row span::before { content: '■'; margin-right: 4px; }