:root {
  --bg: #f4f9f1;
  --card: #ffffff;
  --ink: #23402c;
  --muted: #5b6f60;
  --accent: #d96b2e;
  --line: #d8e5d6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14201a;
    --card: #1c2c23;
    --ink: #e6f0e4;
    --muted: #9db3a2;
    --accent: #f08a4b;
    --line: #2d4234;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}
header { margin-bottom: 24px; }
h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 4px; }
h2 { font-size: 1.25rem; margin: 32px 0 8px; }
p, li { color: var(--ink); }
.muted { color: var(--muted); font-size: 0.95rem; }
a { color: var(--accent); }
ul { padding-left: 1.25rem; }
li { margin: 6px 0; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 20px;
  margin: 12px 0;
}
.card h2 { margin-top: 0; }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); }