:root {
  color-scheme: light;
  --bg: #f6f5f2;
  --surface: #fcfcfb;
  --border: #e2e0da;
  --text: #0b0b0b;
  --text-2: #52514e;
  --muted: #7a7873;
  --accent: #2a78d6;
  --grid: #e8e6e0;
  --s1: #2a78d6; /* surrogate */
  --s2: #eb6834; /* physics val */
  --s3: #1baf7a; /* held-out test */
  --good-bg: #e3f4ea; --good-fg: #16663a;
  --warn-bg: #fdf1d8; --warn-fg: #7a5200;
  --info-bg: #e6eefb; --info-fg: #1f4f8f;
  --err-bg: #fde8e8; --err-fg: #8f1f1f;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #121211;
    --surface: #1a1a19;
    --border: #2e2d2a;
    --text: #ffffff;
    --text-2: #c3c2b7;
    --muted: #8e8d86;
    --accent: #6aa6ef;
    --grid: #2a2926;
    --s1: #3987e5;
    --s2: #d95926;
    --s3: #199e70;
    --good-bg: #133222; --good-fg: #8fdcae;
    --warn-bg: #3a2c0c; --warn-fg: #f0c768;
    --info-bg: #15263f; --info-fg: #9cc2f3;
    --err-bg: #3d1717; --err-fg: #f3a3a3;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #121211; --surface: #1a1a19; --border: #2e2d2a; --text: #ffffff; --text-2: #c3c2b7;
  --muted: #8e8d86; --accent: #6aa6ef; --grid: #2a2926; --s1: #3987e5; --s2: #d95926; --s3: #199e70;
  --good-bg: #133222; --good-fg: #8fdcae; --warn-bg: #3a2c0c; --warn-fg: #f0c768;
  --info-bg: #15263f; --info-fg: #9cc2f3; --err-bg: #3d1717; --err-fg: #f3a3a3;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  overflow-x: hidden;
}
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 16px; }
header.wrap { padding-top: 28px; }
h1 { font-size: clamp(1.5rem, 4vw, 2.1rem); line-height: 1.2; margin: 4px 0 10px; }
h2 { font-size: 1.25rem; margin: 40px 0 10px; }
.eyebrow { margin: 0; color: var(--muted); font-size: .8rem; letter-spacing: .06em; text-transform: uppercase; }
.lede { max-width: 72ch; color: var(--text-2); margin: 0 0 14px; }
.note { color: var(--text-2); font-size: .88rem; max-width: 80ch; }
.dim { color: var(--muted); }
a { color: var(--accent); }
.meta { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; font-size: .9rem; }
button {
  font: inherit; font-size: .85rem; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 8px; padding: 6px 12px; cursor: pointer;
}
button:hover { border-color: var(--muted); }
button[aria-selected="true"], button.on { background: var(--text); color: var(--bg); border-color: var(--text); }
.error { margin-top: 12px; padding: 10px 12px; border-radius: 8px; background: var(--err-bg); color: var(--err-fg); font-size: .9rem; }

/* cards */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 14px; display: flex; flex-direction: column; gap: 10px; min-width: 0;
}
.card-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 8px; }
.card h3 { margin: 0; font-size: 1.05rem; }
.card .skill-id { font: .75rem ui-monospace, Consolas, monospace; color: var(--muted); }
.badge { font-size: .75rem; font-weight: 600; padding: 3px 8px; border-radius: 999px; white-space: nowrap; }
.badge.optimal { background: var(--good-bg); color: var(--good-fg); }
.badge.passed { background: var(--info-bg); color: var(--info-fg); }
.badge.training { background: var(--warn-bg); color: var(--warn-fg); }
.headline { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.headline .big { font-size: 2rem; font-weight: 700; font-variant-numeric: tabular-nums; line-height: 1; }
.headline .lbl { color: var(--text-2); font-size: .85rem; }
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 12px; margin: 0; font-size: .85rem; }
.stats dt { color: var(--text-2); }
.stats dd { margin: 0; text-align: right; font-variant-numeric: tabular-nums; }
.video, .video-ph {
  width: 100%; aspect-ratio: 16 / 9; border-radius: 8px; background: var(--bg);
  border: 1px solid var(--border); display: block;
}
.video-ph { display: flex; align-items: center; justify-content: center; text-align: center; color: var(--muted); font-size: .85rem; padding: 12px; }
.video-cap { font-size: .78rem; color: var(--text-2); margin: -4px 0 0; }

/* chart */
.tabs, .filters { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.chart-box { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 14px; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: .85rem; color: var(--text-2); margin-bottom: 8px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.sw { width: 14px; height: 3px; border-radius: 2px; display: inline-block; }
.sw.dot { width: 9px; height: 9px; border-radius: 50%; }
.sw.vline { width: 0; height: 12px; border-left: 2px dashed; border-radius: 0; }
.chart-wrap { position: relative; height: 340px; }
@media (max-width: 600px) { .chart-wrap { height: 280px; } }

/* events */
.events { list-style: none; padding: 0; margin: 0; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; }
.events li { display: grid; grid-template-columns: 150px 1fr; gap: 4px 12px; padding: 9px 14px; border-top: 1px solid var(--border); font-size: .88rem; }
.events li:first-child { border-top: 0; }
.events time { color: var(--muted); font-variant-numeric: tabular-nums; }
.tag { font-size: .72rem; font-weight: 600; padding: 1px 7px; border-radius: 999px; margin-right: 6px; }
.tag.best { background: var(--good-bg); color: var(--good-fg); }
.tag.level { background: var(--info-bg); color: var(--info-fg); }
.tag.reseed, .tag.restart { background: var(--warn-bg); color: var(--warn-fg); }
@media (max-width: 600px) { .events li { grid-template-columns: 1fr; } }
#more-events { margin-top: 10px; }

/* engineering log */
.table-scroll { overflow-x: auto; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; }
table.eng { border-collapse: collapse; width: 100%; font-size: .86rem; }
table.eng th, table.eng td { text-align: left; vertical-align: top; padding: 10px 12px; border-top: 1px solid var(--border); }
table.eng th { border-top: 0; color: var(--text-2); font-weight: 600; background: var(--bg); }
table.eng code, .eng-extra code { font: .82em ui-monospace, Consolas, monospace; background: var(--bg); padding: 1px 4px; border-radius: 4px; }
@media (max-width: 700px) {
  /* stack rows so the long table never scrolls sideways on phones */
  table.eng thead { display: none; }
  table.eng tr { display: block; border-top: 1px solid var(--border); padding: 6px 0; }
  table.eng tr:first-child { border-top: 0; }
  table.eng td { display: block; border: 0; padding: 4px 12px; }
  table.eng td::before { content: attr(data-h); display: block; font-size: .72rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
}
.eng-extra { color: var(--text-2); font-size: .9rem; max-width: 80ch; }

footer.wrap { margin-top: 48px; padding-top: 16px; padding-bottom: 32px; border-top: 1px solid var(--border); font-size: .88rem; }