:root {
  --bg: #F4F7F7; --surface: #FFFFFF; --hairline: #DDE5E5;
  --ink: #0B1416; --muted: #55666A; --accent: #12836B;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #080E10; --surface: #131D21; --hairline: #243237;
    --ink: #EDF3F4; --muted: #93A5AA; --accent: #2FD4A8;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; padding: 0 20px 80px;
  background: var(--bg); color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 660px; margin: 0 auto; }
header { padding: 72px 0 40px; }
h1 { font-size: 40px; line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 8px; }
.tagline { color: var(--muted); font-size: 19px; margin: 0; }
h2 { font-size: 22px; letter-spacing: -0.01em; margin: 40px 0 12px; }
p, li { color: var(--ink); }
.muted { color: var(--muted); }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.card {
  background: var(--surface); border: 1px solid var(--hairline);
  border-radius: 16px; padding: 22px 24px; margin: 20px 0;
}
.card h2 { margin-top: 0; }
ul { padding-left: 22px; }
li { margin: 6px 0; }
footer {
  margin-top: 56px; padding-top: 24px;
  border-top: 1px solid var(--hairline);
  color: var(--muted); font-size: 15px;
}