:root {
  --ocean-950: #0B1A2B;
  --ocean-800: #1E4470;
  --ocean-600: #265690;
  --ocean-300: #7EB0D8;
  --ink: #1a2530;
  --muted: #55606c;
  --bg: #f6f9fc;
  --card: #ffffff;
  --border: #e2e8f0;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
}
a { color: var(--ocean-600); }
.wrap { max-width: 760px; margin: 0 auto; padding: 24px; }
header.site {
  background: var(--ocean-950);
  color: #fff;
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
}
header.site a { color: var(--ocean-300); text-decoration: none; font-size: 14px; }
header.site nav a { margin-left: 18px; }
.brand { font-size: 20px; font-weight: 700; color: #fff; letter-spacing: .3px; }
.hero {
  background: linear-gradient(160deg, var(--ocean-950), var(--ocean-800));
  color: #fff; text-align: center; padding: 64px 24px;
}
.hero h1 { font-size: 34px; margin: 0 0 12px; }
.hero p { font-size: 18px; color: var(--ocean-300); max-width: 560px; margin: 0 auto; }
main h1 { font-size: 28px; margin-top: 0; }
main h2 { font-size: 19px; margin-top: 32px; color: var(--ocean-800); }
.muted { color: var(--muted); font-size: 14px; }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; padding: 20px 24px; margin: 20px 0;
}
ul { padding-left: 20px; }
li { margin: 6px 0; }
footer.site {
  border-top: 1px solid var(--border); margin-top: 48px;
  color: var(--muted); font-size: 13px; text-align: center; padding: 24px;
}
footer.site a { color: var(--muted); }
@media (prefers-color-scheme: dark) {
  :root { --ink: #e6edf3; --muted: #9aa7b4; --bg: #0d1620; --card: #131f2b; --border: #24313f; }
  a { color: var(--ocean-300); }
}