:root {
  color-scheme: light;
  --bg: #f5f6f8; --panel: #fff; --ink: #16181d; --muted: #646a76; --line: #e2e5ea; --grid: #eef0f3;
  --accent: #2f5fd0; --accent-soft: #e6edfb; --good: #1d7a4a; --bad: #b42318;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #111317; --panel: #1a1d23; --ink: #e9ebef; --muted: #9aa1ad; --line: #2b2f37; --grid: #23272e;
    --accent: #7ea2ff; --accent-soft: #1f2a44; --good: #5fd39a; --bad: #ff8a80;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111317; --panel: #1a1d23; --ink: #e9ebef; --muted: #9aa1ad; --line: #2b2f37; --grid: #23272e;
  --accent: #7ea2ff; --accent-soft: #1f2a44; --good: #5fd39a; --bad: #ff8a80;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 14px/1.5 -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
a { color: var(--accent); }
header { background: var(--panel); border-bottom: 1px solid var(--line); }
header .in { max-width: 1180px; margin: 0 auto; padding: 10px 16px; display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.brand { font-weight: 800; }
nav { display: flex; gap: 2px; flex-wrap: wrap; flex: 1; }
nav a { color: var(--muted); text-decoration: none; padding: 6px 10px; border-radius: 8px; }
nav a.on { color: var(--ink); background: var(--bg); font-weight: 600; }
.me { color: var(--muted); font-size: 13px; display: flex; gap: 8px; align-items: center; }
.ghost { background: transparent; border: 1px solid var(--line); color: var(--ink); border-radius: 8px; padding: 5px 10px; font: inherit; cursor: pointer; }
main { max-width: 1180px; margin: 0 auto; padding: 20px 16px 60px; }
h1 { font-size: 22px; margin: 0 0 4px; } h2 { font-size: 16px; margin: 0 0 10px; }
.sub { color: var(--muted); margin: 0 0 18px; }
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin-bottom: 16px; }
.tile { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.tile b { display: block; font-size: 26px; font-variant-numeric: tabular-nums; line-height: 1.2; }
.tile span { color: var(--muted); font-size: 12px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 12px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; margin-bottom: 12px; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 500; font-size: 12px; }
td.n, th.n { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.muted { color: var(--muted); }
.bad { color: var(--bad); } .good { color: var(--good); }
.bar { height: 8px; background: var(--accent); border-radius: 0 4px 4px 0; min-width: 2px; }
.chart svg { width: 100%; height: auto; display: block; }
.chart .axis { font-size: 13px; }
.chart .grid { stroke: var(--grid); stroke-width: 1; }
.chart .col { fill: var(--accent); }
.chart .col:hover { fill-opacity: .75; }
.chart .axis { fill: var(--muted); }
.cohort td.n { min-width: 46px; }
.note { background: var(--accent-soft); border-radius: 10px; padding: 10px 14px; margin-bottom: 14px; }
.login { max-width: 420px; margin: 16vh auto 0; text-align: center; }
.gbtn { display: inline-flex; align-items: center; gap: 10px; background: var(--panel); color: var(--ink); border: 1px solid var(--line); border-radius: 10px; padding: 12px 20px; font-weight: 600; text-decoration: none; }
.gbtn b { color: #4285f4; }
.theme-toggle { font-size: 13px; white-space: nowrap; }
.theme-toggle.floating { position: fixed; right: 12px; bottom: 12px; z-index: 50; background: var(--panel); color: var(--ink);
  border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; cursor: pointer; }