:root {
  --fg: #1f2328;
  --muted: #59636e;
  --bg: #ffffff;
  --panel: #f6f8fa;
  --border: #d1d9e0;
  --accent: #0969da;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e6edf3;
    --muted: #9198a1;
    --bg: #0d1117;
    --panel: #151b23;
    --border: #3d444d;
    --accent: #4493f8;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.75rem 1.5rem;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
}

.brand img { border-radius: 8px; }

nav {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

nav a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

nav a:hover { text-decoration: underline; }

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

h1, h2, h3, h4 { line-height: 1.3; }
h1 { font-size: 2rem; border-bottom: 1px solid var(--border); padding-bottom: 0.35rem; }
h2 { font-size: 1.5rem; border-bottom: 1px solid var(--border); padding-bottom: 0.3rem; }

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

img { max-width: 100%; height: auto; }

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.875em;
  background: var(--panel);
  padding: 0.15em 0.4em;
  border-radius: 6px;
}

pre {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  overflow-x: auto;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.85em;
}

table {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.4rem 0.75rem;
  text-align: left;
}

th { background: var(--panel); }

blockquote {
  margin: 1rem 0;
  padding: 0.25rem 1rem;
  border-left: 4px solid var(--border);
  color: var(--muted);
}

footer {
  max-width: 860px;
  margin: 0 auto;
  padding: 1rem 1.5rem 2rem;
  color: var(--muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--border);
}