:root {
  --accent: #007aff;
  --bg: #f7f7f9;
  --fg: #1c1c1e;
  --muted: #6b6b70;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root { --bg:#000; --fg:#f2f2f7; --muted:#9a9aa0; --card:#1c1c1e; }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
}
header {
  text-align: center;
  padding: 64px 24px 32px;
}
header h1 { font-size: 40px; margin: 0 0 8px; letter-spacing: -0.5px; }
header p.tag { color: var(--muted); font-size: 20px; margin: 0; }
main { max-width: 720px; margin: 0 auto; padding: 0 24px 80px; }
.card {
  background: var(--card);
  border-radius: 16px;
  padding: 28px;
  margin: 20px 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
h2 { margin-top: 0; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
nav { text-align: center; margin: 24px 0; }
nav a { margin: 0 12px; font-weight: 600; }
.features { list-style: none; padding: 0; }
.features li { padding: 6px 0 6px 28px; position: relative; }
.features li::before { content: "•"; color: var(--accent); position: absolute; left: 8px; }
footer { text-align: center; color: var(--muted); padding: 40px 24px; font-size: 14px; }
.muted { color: var(--muted); }