:root {
  color-scheme: light dark;
  --bg: #f6f7fb;
  --surface: #ffffff;
  --text: #172033;
  --muted: #59647a;
  --accent: #3157d5;
  --border: #dfe3ec;
  --max: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101522;
    --surface: #171e2f;
    --text: #f3f5fb;
    --muted: #b3bdd1;
    --accent: #9bb1ff;
    --border: #303a50;
  }
}

* { box-sizing: border-box; }

html { font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.6; }
body { margin: 0; background: var(--bg); color: var(--text); }
a { color: var(--accent); text-underline-offset: 0.18em; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

header, main, footer { width: min(calc(100% - 2rem), var(--max)); margin-inline: auto; }
header { padding: 3rem 0 1.5rem; }
main { background: var(--surface); border: 1px solid var(--border); border-radius: 18px; padding: clamp(1.25rem, 4vw, 2.5rem); }
footer { color: var(--muted); padding: 1.5rem 0 3rem; font-size: 0.9rem; }
h1, h2, h3 { line-height: 1.2; }
h1 { margin: 0 0 0.5rem; font-size: clamp(2rem, 7vw, 3.5rem); letter-spacing: -0.04em; }
h2 { margin-top: 2rem; font-size: 1.35rem; }
h3 { margin-top: 1.5rem; font-size: 1.05rem; }
p, li { max-width: 70ch; }
.eyebrow, .updated { color: var(--muted); }
.eyebrow { margin: 0 0 0.35rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.78rem; }
.lead { font-size: 1.15rem; color: var(--muted); }
.language-nav { display: flex; flex-wrap: wrap; gap: 0.65rem; margin-top: 1.25rem; }
.language-nav a { display: inline-block; border: 1px solid var(--border); border-radius: 999px; padding: 0.45rem 0.8rem; background: var(--surface); }
.feature-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0.75rem; padding: 0; list-style: none; }
.feature-list li { border: 1px solid var(--border); border-radius: 12px; padding: 0.85rem 1rem; }
.notice { border-left: 4px solid var(--accent); padding: 0.75rem 1rem; background: var(--bg); }
.back { display: inline-block; margin-bottom: 1rem; }
code { overflow-wrap: anywhere; }

@media (max-width: 520px) {
  header { padding-top: 2rem; }
  main { border-radius: 12px; }
}