:root {
  /* Light theme */
  --bg: #ffffff;
  --fg: #111111;
  --muted: #555;
  --border: #e5e5e5;
  --link: #0b57d0;
  --link-visited: #6f2dbd;
  --code-bg: #f5f5f5;

  --maxw: 75ch; /* readable line length */
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #e8e8e8;
    --muted: #b3b3b3;
    --border: #2a2f3a;
    --link: #7ab7ff;
    --link-visited: #caa6ff;
    --code-bg: #171a21;
  }
}

* { box-sizing: border-box; }
html { color-scheme: light dark; }

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

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.25rem;
}

a { color: var(--link); }
a:visited { color: var(--link-visited); }
a:hover { text-decoration: none; }
a:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 2px;
  border-radius: 4px;
}

header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
}

.site-title {
  margin: 0 0 0.5rem 0;
  font-size: 1.25rem;
  line-height: 1.3;
}

nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

nav a {
  text-decoration: none;
  padding: 0.15rem 0.25rem;
  border-radius: 4px;
}

main h1 { font-size: 1.6rem; margin: 1rem 0 0.5rem; }
main h2 { font-size: 1.25rem; margin: 1.25rem 0 0.5rem; }
p { margin: 0.75rem 0; color: var(--fg); }
.muted { color: var(--muted); }

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 1.25rem 0;
}

code, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.95em;
}

pre {
  background: var(--code-bg);
  padding: 0.75rem;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
}

footer {
  border-top: 1px solid var(--border);
  margin-top: 2rem;
  padding-top: 1rem;
  font-size: 0.95rem;
  color: var(--muted);
}

/* Skip link for keyboard users */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
}
.skip-link:focus { left: 1rem; top: 1rem; z-index: 1000; }