:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5f6368;
  --accent: #2d7d6f;
  --border: #e5e7eb;
  --code-bg: #f4f5f7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #e5e7eb;
    --muted: #9ca3af;
    --accent: #5fb3a3;
    --border: #2a2e36;
    --code-bg: #1a1d23;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--fg);
  background: var(--bg);
}

header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

nav {
  max-width: 760px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent);
  text-decoration: none;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
}

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

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

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

h1, h2, h3, h4 {
  line-height: 1.25;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

h1 { font-size: 2.25rem; margin-top: 0; }
h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border); padding-bottom: 0.35rem; }
h3 { font-size: 1.2rem; }

p, ul, ol, table { margin: 0.75rem 0; }

a {
  color: var(--accent);
}

ul, ol {
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.25rem;
}

code {
  background: var(--code-bg);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}

pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
}

blockquote {
  border-left: 3px solid var(--accent);
  margin: 1rem 0;
  padding: 0.25rem 1rem;
  color: var(--muted);
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.95em;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--code-bg);
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

footer p { margin: 0.25rem 0; }
footer a { color: var(--muted); }