:root {
  --bg: #ffffff;
  --text: #1c1c1e;
  --muted: #6e6e73;
  --line: #e5e5ea;
  --accent: #3a5bd9;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0d14;
    --text: #f2f2f7;
    --muted: #a1a1aa;
    --line: #2c2c34;
    --accent: #8ea6ff;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
}
header, main, footer { max-width: 720px; margin: 0 auto; padding: 0 20px; }
header {
  display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between;
  padding-top: 20px; padding-bottom: 20px; border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; color: var(--text); text-decoration: none; }
.brand img { border-radius: 7px; }
nav { display: flex; gap: 18px; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--text); }
main { padding-top: 24px; padding-bottom: 48px; }
h1 { font-size: 34px; line-height: 1.2; margin: 16px 0 8px; }
h2 { font-size: 22px; margin: 36px 0 8px; }
h3 { font-size: 18px; margin: 28px 0 4px; }
a { color: var(--accent); }
hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; }
ul { padding-left: 22px; }
li { margin: 4px 0; }
footer { color: var(--muted); font-size: 14px; padding-top: 20px; padding-bottom: 40px; border-top: 1px solid var(--line); }
.hero { padding: 64px 0 32px; }
.hero h1 { font-size: 44px; margin: 0; }
.hero p { color: var(--muted); font-size: 20px; margin: 8px 0 0; }