*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #3b82f6;
  --code-bg: #f3f4f6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111111;
    --fg: #e5e5e5;
    --muted: #9ca3af;
    --border: #2a2a2a;
    --accent: #60a5fa;
    --code-bg: #1e1e1e;
  }
}

html { font-size: 16px; }

body {
  font-family: "SF Mono", Menlo, "Courier New", monospace;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.7;
  padding: 2rem 1rem 4rem;
}

.container {
  max-width: 680px;
  margin: 0 auto;
}

/* Header */
.site-header {
  display: flex;
  align-items: center;
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.site-header > a {
  font-family: "SF Mono", Menlo, "Courier New", monospace;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.site-header > a:hover { color: var(--accent); }

.site-header nav {
  display: flex;
  gap: 1.5rem;
  margin-left: auto;
  flex-shrink: 0;
}

.site-header nav a {
  font-family: "SF Mono", Menlo, "Courier New", monospace;
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--muted);
  white-space: nowrap;
  text-decoration: none;
}

.site-header nav a:hover { color: var(--fg); }

/* Page title */
h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.25rem;
}

.meta {
  font-size: 0.8125rem;
  color: var(--muted);
  margin-bottom: 2.5rem;
}

/* Sections */
h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--muted);
}

p { margin-bottom: 0.875rem; }
p:last-child { margin-bottom: 0; }

ul {
  padding-left: 1.25rem;
  margin-bottom: 0.875rem;
}

li { margin-bottom: 0.25rem; }

.summary {
  background: var(--code-bg);
  border-left: 3px solid var(--accent);
  padding: 0.75rem 1rem;
  border-radius: 0 6px 6px 0;
  font-size: 0.9375rem;
  margin-bottom: 1.5rem;
}

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

strong { font-weight: 600; }

/* Footer */
.site-footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.8125rem;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}