:root {
  --bg: #f2f2f7;
  --card: #ffffff;
  --text: #000000;
  --muted: #5f5f64;
  --accent: #0062cc;
  --line: #e5e5ea;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1c1c1e;
    --text: #ffffff;
    --muted: #a1a1a6;
    --accent: #4da3ff;
    --line: #38383a;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); }
main { max-width: 720px; margin: 0 auto; padding: 48px 16px 64px; }
header.site { display: flex; align-items: center; gap: 12px; margin-bottom: 32px; }
header.site a { color: var(--text); text-decoration: none; font-weight: 600; }
.mark { width: 36px; height: 36px; }
h1 { font-size: 34px; line-height: 1.15; margin: 0 0 8px; letter-spacing: 0.2px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
.card { background: var(--card); border-radius: 14px; padding: 20px 22px; margin: 16px 0; }
.card h2 { margin-top: 0; }
ul { padding-left: 22px; }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 15px; color: var(--muted); }
footer a { margin-right: 16px; }
.hero { text-align: center; padding: 32px 0 8px; }
.hero .icon { width: 96px; height: 96px; border-radius: 22px; margin-bottom: 20px; }
.hero p { font-size: 20px; color: var(--muted); max-width: 520px; margin: 8px auto 24px; }
.badge {
  display: inline-block; padding: 12px 22px; border-radius: 12px; background: var(--text); color: var(--bg);
  text-decoration: none; font-weight: 600;
}
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin-top: 40px; }
.features .card { margin: 0; }
.features h2 { font-size: 17px; margin: 0 0 4px; }
.features p { margin: 0; color: var(--muted); font-size: 15px; }