:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --link: #1E63E9;
  --border: #e5e5e5;
  --card: #fafafa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111315;
    --fg: #f0f0f0;
    --muted: #9aa0a6;
    --link: #6ea8ff;
    --border: #2a2d31;
    --card: #1a1d20;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
  margin-bottom: 32px;
}

header h1 {
  margin: 0 0 4px;
  font-size: 28px;
  font-weight: 700;
}

header p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

h2 {
  margin-top: 40px;
  font-size: 20px;
  font-weight: 600;
}

h3 {
  margin-top: 28px;
  font-size: 16px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

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

a:hover {
  text-decoration: underline;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px 24px;
  margin: 24px 0;
}

.lang-divider {
  margin: 56px 0 32px;
  border: none;
  border-top: 1px solid var(--border);
}

ul {
  padding-left: 22px;
}

li {
  margin-bottom: 6px;
}

footer {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}

footer a {
  color: var(--muted);
}

nav {
  margin: 8px 0 0;
  font-size: 14px;
}

nav a + a {
  margin-left: 16px;
}

code {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.92em;
}