:root {
  --bg: #070c0e; --card: #0c1418; --text: #d9e8e4;
  --muted: #7e938f; --accent: #3ee08f;
  --divider: rgba(255, 255, 255, .08);
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8f7; --card: #eaefed; --text: #17201e;
    --muted: #5b6b67; --accent: #0f7a47;
    --divider: rgba(0, 0, 0, .08);
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 400 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 42rem; margin: 0 auto; padding: 2.5rem 1rem 4rem; }
h1 { font-size: 1.6rem; line-height: 1.3; margin: 0 0 .25rem; }
h2 { font-size: 1.1rem; margin: 2rem 0 .5rem; }
.muted { color: var(--muted); }
a { color: var(--accent); }
nav { display: flex; gap: 1.25rem; margin-bottom: 2rem; font-size: .95rem; }
nav a { text-decoration: none; }
nav a[aria-current="page"] { color: var(--text); }
.card { background: var(--card); border-radius: 14px; padding: 1rem 1.25rem; }
footer { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid var(--divider); font-size: .9rem; }