:root {
  --bg: #0d1117;
  --bg-panel: #151b23;
  --fg: #d5dae2;
  --fg-dim: #8b95a5;
  --accent: #4ad6c4;
  --accent-dim: #2a7d75;
  --border: #232c38;
  --max: 46rem;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f8fa;
    --bg-panel: #ffffff;
    --fg: #1d2430;
    --fg-dim: #5b6675;
    --accent: #0d8f80;
    --accent-dim: #7fd0c6;
    --border: #dfe3e9;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding: 0 1.25rem 5rem;
  background: var(--bg);
  color: var(--fg);
  font: 400 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
}

.wrap { max-width: var(--max); margin: 0 auto; }

/* ---- header ---- */

header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
  padding: 2.5rem 0 1.5rem;
}

.brand {
  display: inline-block;
  color: var(--accent);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  text-decoration: none;
  margin-bottom: 1rem;
}

h1 {
  font-size: 1.9rem;
  line-height: 1.2;
  margin: 0 0 0.6rem;
  letter-spacing: -0.01em;
}

.meta {
  color: var(--fg-dim);
  font-size: 0.875rem;
  margin: 0;
}

/* ---- language / page switcher ---- */

nav.switch {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.25rem;
}

nav.switch a {
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--fg-dim);
  font-size: 0.8125rem;
  padding: 0.3rem 0.85rem;
  text-decoration: none;
  transition: border-color 0.15s, color 0.15s;
}

nav.switch a:hover { border-color: var(--accent-dim); color: var(--fg); }

nav.switch a[aria-current] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
  font-weight: 600;
}

/* ---- body copy ---- */

h2 {
  font-size: 1.0625rem;
  letter-spacing: 0.01em;
  margin: 2.5rem 0 0.75rem;
  padding-top: 0.25rem;
}

h2 .num { color: var(--accent); font-variant-numeric: tabular-nums; margin-right: 0.4rem; }

p { margin: 0 0 1rem; }

ul { margin: 0 0 1rem; padding-left: 1.25rem; }

li { margin-bottom: 0.5rem; }

a { color: var(--accent); overflow-wrap: anywhere; }

strong { color: var(--fg); font-weight: 600; }

.lead {
  border-left: 2px solid var(--accent-dim);
  color: var(--fg-dim);
  padding-left: 1rem;
}

/* ---- landing cards ---- */

.cards {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  margin: 2rem 0;
}

.card {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  color: inherit;
  display: block;
  padding: 1.25rem;
  text-decoration: none;
  transition: border-color 0.15s, transform 0.15s;
}

.card:hover { border-color: var(--accent-dim); transform: translateY(-2px); }

.card h3 { font-size: 1rem; margin: 0 0 0.35rem; }

.card p { color: var(--fg-dim); font-size: 0.875rem; margin: 0; }

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

footer {
  border-top: 1px solid var(--border);
  color: var(--fg-dim);
  font-size: 0.8125rem;
  margin-top: 3.5rem;
  padding-top: 1.5rem;
}

footer a { color: var(--fg-dim); }