/* Design tokens and site chrome.
 *
 * Hand-written, NOT generated. `tracker build` emits index.html against these
 * class names and copies this file into site/ unchanged. Keep the contract in
 * tracker/DESIGN.md in sync with any change here.
 */

:root {
  /* spacing: 4px scale */
  --s1: 0.25rem; --s2: 0.5rem;  --s3: 0.75rem; --s4: 1rem;
  --s6: 1.5rem;  --s8: 2rem;    --s12: 3rem;   --s16: 4rem;

  /* type: one family, 5 sizes, 2 weights */
  --font: ui-sans-serif, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  --t-xs: 0.8125rem; --t-sm: 0.9375rem; --t-base: 1rem;
  --t-lg: 1.375rem;  --t-xl: 2.5rem;

  /* color: neutral surface, one accent, semantic reserved for meaning */
  --bg: #fcfcfa;
  --surface: #ffffff;
  --border: #e2e0db;
  --text: #1c1b19;
  --text-muted: #5d5a54;
  --accent: #a8431a;
  --accent-soft: #f3e6df;
  --rust: #a8431a;
  --julia: #3a6ea8;
  --radius: 8px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #171614;
    --surface: #201f1c;
    --border: #35332e;
    --text: #f2f0ec;
    --text-muted: #a8a49c;
    --accent: #e8824f;
    --accent-soft: #2e2219;
    --rust: #e8824f;
    --julia: #7aa8d8;
  }
}
:root[data-theme="dark"] {
  --bg: #171614; --surface: #201f1c; --border: #35332e;
  --text: #f2f0ec; --text-muted: #a8a49c;
  --accent: #e8824f; --accent-soft: #2e2219;
  --rust: #e8824f; --julia: #7aa8d8;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: var(--t-base)/1.6 var(--font);
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 62ch;
  margin: 0 auto;
  padding: var(--s16) var(--s4) var(--s12);
}
@media (max-width: 480px) { .wrap { padding-top: var(--s8); } }

/* --- header --- */
.site-title {
  font-size: clamp(2rem, 7.5vw, var(--t-xl));
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 var(--s3);
}
.lede { font-size: var(--t-base); color: var(--text-muted); margin: 0 0 var(--s12); }
.lede strong { color: var(--text); font-weight: 600; }

/* --- progress --- */
.progress-label {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: var(--s4); margin-bottom: var(--s2);
  font-size: var(--t-sm); color: var(--text-muted);
}
.progress-label b { color: var(--text); font-weight: 600; font-variant-numeric: tabular-nums; }
.progress-track {
  height: 6px; border-radius: 999px;
  background: var(--border); overflow: hidden;
}
.progress-fill { height: 100%; background: var(--accent); border-radius: 999px; }

/* --- stat tiles: 3-4 max, see DESIGN.md --- */
.tiles {
  display: grid; gap: var(--s4);
  grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
  margin: var(--s8) 0;
}
.tile {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: var(--s4);
}
.tile-value {
  font-size: var(--t-lg); font-weight: 600;
  font-variant-numeric: tabular-nums; line-height: 1.2;
}
.tile-label { font-size: var(--t-xs); color: var(--text-muted); margin-top: var(--s1); }

/* --- empty state: onboarding, not an error (ui-ux 5.2) --- */
.empty {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: var(--s6);
  margin: var(--s8) 0;
}
.empty h2 { font-size: var(--t-base); font-weight: 600; margin: 0 0 var(--s2); }
.empty p { color: var(--text-muted); font-size: var(--t-sm); margin: 0 0 var(--s4); }
.empty p:last-child { margin-bottom: 0; }
.empty ol { color: var(--text-muted); font-size: var(--t-sm); margin: 0; padding-left: var(--s6); }
.empty li + li { margin-top: var(--s2); }

code, .mono { font-family: var(--mono); font-size: 0.9em; }
code {
  background: var(--accent-soft); color: var(--text);
  padding: 0.1em 0.35em; border-radius: 4px;
}

/* --- language chips: never color alone (ui-ux 4, 9) --- */
.chip {
  display: inline-flex; align-items: center; gap: var(--s1);
  font-size: var(--t-xs); color: var(--text-muted);
}
.chip::before {
  content: ""; width: 8px; height: 8px; border-radius: 2px;
  background: var(--text-muted);
}
.chip-rust::before { background: var(--rust); border-radius: 2px; }
.chip-julia::before { background: var(--julia); border-radius: 999px; }

/* --- links --- */
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px;
}

footer {
  margin-top: var(--s16); padding-top: var(--s6);
  border-top: 1px solid var(--border);
  font-size: var(--t-xs); color: var(--text-muted);
}
footer p { margin: 0 0 var(--s2); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}