:root {
  color-scheme: light dark;
  --bg: #f2f2f7;
  --surface: #ffffff;
  --text: #111111;
  --secondary: #6e6e73;
  --accent: #007aff;
  --border: rgba(60, 60, 67, 0.18);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --surface: #1c1c1e;
    --text: #ffffff;
    --secondary: #98989d;
    --accent: #0a84ff;
    --border: rgba(84, 84, 88, 0.65);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
}

main,
.site-header,
.site-footer {
  width: min(720px, calc(100% - 40px));
  margin-left: auto;
  margin-right: auto;
}

.site-header {
  padding: 32px 0 20px;
}

.brand {
  color: var(--text);
  font-size: 18px;
  font-weight: 700;
  text-decoration: none;
}

main {
  padding: 36px 0 72px;
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(36px, 7vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.035em;
}

h2 {
  margin: 40px 0 10px;
  font-size: 22px;
  line-height: 1.2;
}

p,
li {
  font-size: 17px;
}

.lead {
  max-width: 620px;
  color: var(--secondary);
  font-size: 20px;
}

.card {
  margin-top: 28px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
}

a {
  color: var(--accent);
}

.site-footer {
  padding: 24px 0 40px;
  border-top: 1px solid var(--border);
  color: var(--secondary);
  font-size: 14px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 12px;
}

.footer-links a {
  color: var(--secondary);
  text-decoration: none;
}

@media (max-width: 520px) {
  main,
  .site-header,
  .site-footer {
    width: min(100% - 28px, 720px);
  }

  main {
    padding-top: 24px;
  }

  .card {
    padding: 20px;
  }
}