:root {
  color-scheme: light dark;
  --text: #1c1c1e;
  --bg: #f6f5f2;
  --card: #fff;
  --muted: #5c5c60;
  --link: #0b57d0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #f2f2f4;
    --bg: #1c1c1e;
    --card: #2c2c2e;
    --muted: #aeaeb2;
    --link: #8ab4f8;
  }
}
body {
  margin: 0;
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif;
  color: var(--text);
  background: var(--bg);
}
main {
  max-width: 40rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
  background: var(--card);
  min-height: 100vh;
  box-sizing: border-box;
}
h1 { font-size: 1.6rem; line-height: 1.3; margin: 0 0 0.4rem; }
h2 { font-size: 1.15rem; margin: 1.6rem 0 0.4rem; }
p, li { margin: 0.4rem 0; }
.meta { color: var(--muted); font-size: 0.95rem; }
nav { margin: 0 0 1.2rem; font-size: 0.95rem; }
a { color: var(--link); }
ul { padding-left: 1.2rem; }