/* ---------- tokens: dark is the default, light overrides below ---------- */

:root {
  color-scheme: dark;

  /* Neutrals carry a slight warm bias toward the accent rather than sitting
     on a cold grey axis, so the ground and the rust accent read as one set. */
  --bg: #100e0c;
  --bg-soft: #16130f;
  --surface: #1a1613;
  --surface-hover: #221d19;
  --border: #2c2723;
  --border-strong: #423b35;

  --text: #ece7e1;
  --text-dim: #a89e95;
  --text-faint: #7a7168;

  --accent: #d1782f;
  --accent-soft: rgba(209, 120, 47, 0.15);

  /* One hue per language. Semantic, and separate from the accent except for
     Rust, which the accent was already named after. */
  --lang-rust: #d1782f;
  --lang-rust-soft: rgba(209, 120, 47, 0.15);
  --lang-go: #4ec5dd;
  --lang-go-soft: rgba(78, 197, 221, 0.15);
  --lang-python: #e6c15a;
  --lang-python-soft: rgba(230, 193, 90, 0.15);

  --sans: 'IBM Plex Sans', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --radius: 10px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

/* Dark is the default. Light is opt-in through the toggle only, so the
   system preference deliberately does not switch the page. */
:root[data-theme="light"] {
  color-scheme: light;

  --bg: #fbf9f6;
  --bg-soft: #f4f1ec;
  --surface: #ffffff;
  --surface-hover: #f7f4f0;
  --border: #e7e0d8;
  --border-strong: #cec4b8;

  --text: #1a1613;
  --text-dim: #5c534b;
  --text-faint: #857a70;

  --accent: #a8541a;
  --accent-soft: rgba(168, 84, 26, 0.10);
  --lang-rust: #a8541a;
  --lang-rust-soft: rgba(168, 84, 26, 0.12);
  --lang-go: #0d7d99;
  --lang-go-soft: rgba(13, 125, 153, 0.12);
  --lang-python: #8a6a12;
  --lang-python-soft: rgba(138, 106, 18, 0.12);

  --shadow: 0 1px 2px rgba(26, 22, 19, 0.06);
}

/* ---------- base ---------- */

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.skip-link {
  position: absolute;
  left: -9999px;
}
.skip-link:focus {
  left: 16px;
  top: 16px;
  z-index: 10;
  padding: 8px 14px;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.page {
  max-width: 880px;
  margin: 0 auto;
  padding: 72px 24px 96px;
}

/* ---------- intro ---------- */

.intro-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

h1 {
  margin: 0;
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.15;
}

.role {
  margin: 8px 0 0;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
  letter-spacing: -0.01em;
}

.positioning {
  margin: 28px 0 0;
  max-width: 62ch;
  color: var(--text-dim);
  font-size: 17px;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}

.links a {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.links a:hover {
  color: var(--text);
  border-color: var(--border-strong);
  background: var(--surface-hover);
}

/* ---------- theme toggle ---------- */

.theme-toggle {
  flex: none;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text-dim);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--border-strong);
}

.theme-toggle-icon {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 2px solid currentColor;
  background: linear-gradient(to right, currentColor 0 50%, transparent 50% 100%);
}

/* ---------- stats ---------- */

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 44px 0 0;
  padding: 0;
}

.stat {
  flex: 1 1 0;
  min-width: 132px;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);

  /* Source order is dt then dd, as <dl> requires. Reversed here so the
     number reads above its label. */
  display: flex;
  flex-direction: column-reverse;
  justify-content: flex-end;
}

.stat dt {
  margin: 6px 0 0;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.stat dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

/* ---------- sections ---------- */

.section { margin-top: 64px; }

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--border);
}

.section-note {
  margin: 5px 0 0;
  font-size: 13px;
  font-weight: 400;
  color: var(--text-faint);
  text-transform: none;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-faint);
}

/* ---------- filters ---------- */

.filters {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.filter-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.filter-label {
  flex: none;
  width: 64px;
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
}

.chip {
  padding: 5px 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.chip:hover {
  color: var(--text);
  border-color: var(--border-strong);
}

.chip[aria-pressed="true"] {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* ---------- contribution rows ---------- */

.contrib-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.contrib {
  position: relative;
  padding: 18px 20px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.15s ease;
}

.contrib:hover {
  border-color: var(--border-strong);
  background: var(--surface-hover);
  transform: translateY(-1px);
}

/* The title covers the whole row, so a click anywhere opens the PR. The repo
   and PR-number links sit above that overlay and keep their own targets. */
.stretched::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
}

.repo,
.pr-link {
  position: relative;
  z-index: 1;
  text-decoration: none;
}

.contrib-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--mono);
  font-size: 13px;
}

.repo {
  font-weight: 700;
  color: var(--text);
  word-break: break-word;
}

.repo:hover { color: var(--accent); text-decoration: underline; }

.pr { color: var(--text-faint); }
.pr-link { color: inherit; }
.pr-link:hover { color: var(--accent); }

.meta {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-faint);
  font-size: 12px;
}

.badge {
  padding: 2px 8px;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.badge.lang-rust   { color: var(--lang-rust);   background: var(--lang-rust-soft); }
.badge.lang-go     { color: var(--lang-go);     background: var(--lang-go-soft); }
.badge.lang-python { color: var(--lang-python); background: var(--lang-python-soft); }

.contrib-title {
  margin: 10px 0 0;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
  letter-spacing: -0.01em;
}

.contrib-title a { color: inherit; text-decoration: none; }
.contrib:hover .contrib-title a { color: var(--accent); }

.stars, .date { white-space: nowrap; }

.contrib-problem {
  margin: 6px 0 0;
  max-width: 68ch;
  color: var(--text-dim);
  font-size: 14.5px;
}

.tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 13px 0 0;
  padding: 0;
}

.tag {
  padding: 2px 8px;
  border: 1px solid var(--border);
  border-radius: 5px;
  color: var(--text-faint);
  font-family: var(--mono);
  font-size: 11px;
}

.empty {
  margin: 24px 0 0;
  color: var(--text-faint);
  font-size: 14px;
}

/* ---------- footer ---------- */

.footer {
  margin-top: 80px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-dim);
}

.footer p { margin: 0; }
.footer a { text-decoration: none; }
.footer a:hover { color: var(--accent); }
.footer .sep { padding: 0 8px; color: var(--text-faint); }

.footnote {
  margin-top: 8px !important;
  font-size: 12px;
  color: var(--text-faint);
}

/* ---------- narrow screens ---------- */

@media (max-width: 640px) {
  .page { padding: 48px 18px 72px; }
  h1 { font-size: 31px; }
  .positioning { font-size: 16px; }
  .stat { min-width: calc(50% - 6px); }
  .meta { margin-left: 0; width: 100%; }
  .filter-label { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
  .contrib-link:hover { transform: none; }
}