:root {
  color-scheme: light dark;
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #17181c;
  --muted: #60646c;
  --border: #e4e7ec;
  --accent: #4f46e5;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --card: #171a21;
    --text: #f5f7fa;
    --muted: #a8adb7;
    --border: #2a2f39;
    --accent: #8b83ff;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}
main {
  width: min(880px, calc(100% - 32px));
  margin: 48px auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: clamp(24px, 5vw, 56px);
}
h1 { margin-top: 0; line-height: 1.15; }
h2 { margin-top: 2rem; line-height: 1.25; }
a { color: var(--accent); }
.meta { color: var(--muted); }
nav { margin-bottom: 2rem; }
nav a { margin-right: 16px; }
footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: .95rem;
}
ul { padding-left: 1.35rem; }