:root {
  color-scheme: light dark;
  --bg: #0f1115;
  --card: #151922;
  --text: #e6e9ef;
  --muted: #a2a9b6;
  --accent: #4da3ff;
  --border: #232836;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

main {
  max-width: 920px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

header {
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

h1 {
  margin: 0 0 8px;
  font-size: 30px;
}

h2 {
  margin-top: 28px;
  font-size: 20px;
}

p, li {
  color: var(--text);
}

small, .muted {
  color: var(--muted);
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 20px;
}

footer {
  margin-top: 40px;
  border-top: 1px solid var(--border);
  padding-top: 16px;
  font-size: 13px;
  color: var(--muted);
}

@media (max-width: 640px) {
  main {
    padding: 36px 16px 64px;
  }
  h1 {
    font-size: 26px;
  }
}