:root {
  color-scheme: dark;
  --bg: #0d1117;
  --surface: #161b22;
  --surface-raised: #21262d;
  --border: #30363d;
  --text: #f0f6fc;
  --muted: #8b949e;
  --body: #c9d1d9;
  --accent: #2f81f7;
  --accent-soft: rgba(47, 129, 247, .14);
}

* { box-sizing: border-box; }
html { min-height: 100%; scroll-behavior: smooth; }
body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 0%, rgba(47, 129, 247, .15), transparent 32rem),
    radial-gradient(circle at 90% 30%, rgba(126, 87, 194, .10), transparent 28rem),
    var(--bg);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
a { color: #58a6ff; text-decoration: none; }
a:focus-visible { outline: 3px solid rgba(47, 129, 247, .55); outline-offset: 3px; }
.shell { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.topbar { border-bottom: 1px solid rgba(48, 54, 61, .85); background: rgba(13, 17, 23, .78); backdrop-filter: blur(16px); }
.nav { min-height: 68px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { color: var(--text); font-weight: 850; font-size: 19px; letter-spacing: -.02em; }
.nav-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 18px; font-size: 14px; }
.nav-links a { color: var(--body); }
.hero { padding: clamp(64px, 11vw, 120px) 0 48px; max-width: 850px; }
.eyebrow { margin: 0 0 16px; color: #58a6ff; font-size: 13px; font-weight: 800; letter-spacing: .11em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(44px, 9vw, 82px); line-height: .98; letter-spacing: -.055em; }
.lead { max-width: 760px; margin: 24px 0 0; color: var(--body); font-size: clamp(19px, 3vw, 25px); line-height: 1.45; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; padding: 11px 18px; border: 1px solid var(--border); border-radius: 9px; color: var(--text); background: var(--surface-raised); font-weight: 750; }
.button-primary { border-color: var(--accent); background: var(--accent); color: white; }
.button-disabled { color: var(--muted); cursor: default; }
.section { padding: 24px 0 56px; }
.section-heading { margin: 0 0 22px; font-size: clamp(26px, 5vw, 36px); letter-spacing: -.03em; }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card { padding: clamp(22px, 4vw, 32px); border: 1px solid var(--border); border-radius: 14px; background: rgba(22, 27, 34, .92); box-shadow: 0 20px 48px rgba(0, 0, 0, .2); }
.card h2, .card h3 { margin: 0 0 12px; letter-spacing: -.02em; }
.card p, .card li, .prose p, .prose li { color: var(--body); line-height: 1.65; }
.card .button { margin-top: 12px; }
.feature-list { margin: 0; padding-left: 21px; }
.feature-list li + li { margin-top: 8px; }
.tag { display: inline-flex; margin-bottom: 16px; padding: 5px 9px; border: 1px solid rgba(47, 129, 247, .35); border-radius: 999px; color: #79c0ff; background: var(--accent-soft); font-size: 12px; font-weight: 800; text-transform: uppercase; }
.notice { margin-top: 18px; padding: 18px 20px; border-left: 3px solid #d29922; border-radius: 8px; color: #e3b341; background: rgba(210, 153, 34, .10); line-height: 1.55; }
.prose { max-width: 820px; padding-bottom: 56px; }
.prose h2 { margin-top: 34px; font-size: 23px; }
.prose code { color: #79c0ff; overflow-wrap: anywhere; }
.muted { color: var(--muted); }
.footer { margin-top: 34px; border-top: 1px solid var(--border); }
.footer .shell { min-height: 90px; display: flex; align-items: center; justify-content: space-between; gap: 20px; color: var(--muted); font-size: 14px; }
@media (max-width: 760px) {
  .grid, .grid-3 { grid-template-columns: 1fr; }
  .nav { align-items: flex-start; padding: 18px 0; }
  .nav-links { gap: 10px 14px; }
  .hero { padding-top: 54px; }
  .actions .button { width: 100%; }
  .footer .shell { align-items: flex-start; flex-direction: column; justify-content: center; padding: 22px 0; }
}