:root {
  --bg: #ffffff;
  --fg: #111111;
  --muted: #666666;
  --accent: #2563eb;
  --border: #e5e5e5;
  --max-width: 680px;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0a0a;
    --fg: #f5f5f5;
    --muted: #888888;
    --accent: #60a5fa;
    --border: #1f1f1f;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 24px 80px;
}

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 20px 24px;
}

.site-title {
  font-weight: 600;
  font-size: 17px;
  text-decoration: none;
  color: var(--fg);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

h1 {
  font-weight: 600;
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin: 0 0 8px;
}

h2 {
  font-weight: 600;
  font-size: 22px;
  margin: 40px 0 12px;
  letter-spacing: -0.01em;
}

h3 {
  font-weight: 600;
  font-size: 18px;
  margin: 28px 0 8px;
}

p, ul, ol { margin: 0 0 16px; }

li { margin: 4px 0; }

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

code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.92em;
  background: var(--border);
  padding: 1px 6px;
  border-radius: 4px;
}

pre {
  background: var(--border);
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 40px 0;
}

table {
  border-collapse: collapse;
  width: 100%;
  margin: 16px 0;
}

th, td {
  border-bottom: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}

.muted {
  color: var(--muted);
  font-size: 14px;
}