:root {
  --bg: #ffffff;
  --surface: #f3f4f6;
  --text: #111827;
  --muted: #4b5563;
  --primary: #2563eb;
  --border: #e5e7eb;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111827;
    --surface: #1f2937;
    --text: #f9fafb;
    --muted: #9ca3af;
    --primary: #60a5fa;
    --border: #374151;
    color-scheme: dark;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, 'Segoe UI', sans-serif;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 16px 64px;
}

header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}

header img {
  width: 56px;
  height: 56px;
}

h1 {
  margin: 0;
  font-size: 28px;
}

h2 {
  margin-top: 32px;
  font-size: 20px;
}

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

.lead {
  color: var(--muted);
  font-size: 18px;
}

.card {
  padding: 16px 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

ul {
  padding-left: 22px;
}

code {
  padding: 1px 5px;
  border-radius: 4px;
  background: var(--surface);
  font-size: 14px;
}

footer {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}