:root {
  --bg: #f7f6f2;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #5b636b;
  --accent: #1f5f4a;
  --border: #e3e1da;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181b;
    --surface: #1d2125;
    --text: #e8e6e1;
    --muted: #a3aab1;
    --accent: #6fbf9f;
    --border: #2c3136;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--accent); }
header, main, footer { max-width: 760px; margin: 0 auto; padding: 0 16px; }
header { padding-top: 28px; padding-bottom: 8px; }
.brand { font-weight: 700; font-size: 1.15rem; letter-spacing: .02em; text-decoration: none; color: var(--text); }
main { padding-top: 16px; padding-bottom: 48px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 28px 24px; }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 1.15rem; margin: 28px 0 6px; }
.updated, .muted { color: var(--muted); font-size: .95rem; }
ul { padding-left: 1.2em; }
footer { padding-bottom: 32px; color: var(--muted); font-size: .9rem; }
footer nav a { margin-right: 16px; }
.hero { text-align: center; padding: 56px 24px; }
.hero p { color: var(--muted); max-width: 520px; margin: 8px auto 0; }