:root {
  color-scheme: light dark;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --bg: #ffffff;
  --card: #f5f5f7;
  --accent: #1a9e8f;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --bg: #0e1020;
    --card: #1b1e33;
    --accent: #4fd1c0;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  color: var(--text);
  background: var(--bg);
}
main { max-width: 680px; margin: 0 auto; padding: 56px 24px 72px; }
header { text-align: center; margin-bottom: 40px; }
header img { width: 128px; height: 128px; }
h1 { font-size: 40px; line-height: 1.1; margin: 12px 0 8px; letter-spacing: -0.02em; }
h2 { font-size: 22px; margin: 36px 0 8px; }
.tagline { color: var(--muted); font-size: 20px; margin: 0; }
.card { background: var(--card); border-radius: 14px; padding: 4px 22px; margin: 20px 0; }
a { color: var(--accent); }
nav { text-align: center; margin-top: 48px; color: var(--muted); font-size: 15px; }
nav a { margin: 0 10px; }
ul { padding-left: 22px; }
.small { color: var(--muted); font-size: 15px; }