:root {
  --text: #0f172a;
  --muted: #64748b;
  --bg: #ffffff;
  --border: #e2e8f0;
  --primary: #0ea5e9;
  --card-bg: #f8fafc;
  --maxw: 820px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
}
.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 40px 24px 80px;
}
h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}
.updated {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 20px;
}
.languages {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 32px;
}
.languages a, .languages strong { margin-right: 12px; }
h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-top: 48px;
  margin-bottom: 16px;
  color: var(--text);
}
h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 12px;
  color: var(--text);
}
p { margin: 16px 0; color: var(--text); }
ul { margin: 12px 0 16px 0; padding-left: 24px; }
li { margin: 8px 0; color: var(--text); }
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin: 20px 0;
}
.card h3 { margin-top: 0; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
hr { border: 0; height: 1px; background: var(--border); margin: 32px 0; }
strong { font-weight: 600; color: var(--text); }
@media (max-width: 640px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  .container { padding: 24px 20px 64px; }
}