:root {
  --bg: #f7f7f9;
  --card: #ffffff;
  --text: #1c1c1e;
  --muted: #6c6c70;
  --accent: #2d65ff;
  --border: #e4e4e8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115; --card: #1a1c22; --text: #f2f2f5;
    --muted: #9a9aa2; --accent: #5a8bff; --border: #2a2d35;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; padding: 0 20px 64px;
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg); color: var(--text);
}
.wrap { max-width: 680px; margin: 0 auto; }
header { padding: 56px 0 32px; text-align: center; }
.icon {
  width: 92px; height: 92px; border-radius: 21px; display: block; margin: 0 auto 20px;
  box-shadow: 0 6px 20px rgba(0,0,0,.14);
}
h1 { font-size: 30px; margin: 0 0 8px; letter-spacing: -.4px; }
.tagline { color: var(--muted); margin: 0; font-size: 18px; }
h2 { font-size: 21px; margin: 40px 0 14px; letter-spacing: -.2px; }
h3 { font-size: 17px; margin: 26px 0 6px; }
p, li { color: var(--text); }
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 22px 24px; margin: 18px 0;
}
a { color: var(--accent); }
.muted { color: var(--muted); font-size: 15px; }
footer {
  margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border);
  text-align: center; color: var(--muted); font-size: 14px;
}
footer a { margin: 0 10px; }