:root {
  --bg: #ffffff;
  --fg: #1b1f23;
  --muted: #6a737d;
  --accent: #0d6efd;
  --border: #e1e4e8;
  --code-bg: #f6f8fa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0d0f;
    --fg: #e6edf3;
    --muted: #9ba3af;
    --accent: #6aa7ff;
    --border: #1f2328;
    --code-bg: #0f1318;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Ubuntu, Cantarell, "Helvetica Neue", Inter, system-ui, Arial, sans-serif;
  line-height: 1.6;
  background: var(--bg);
  color: var(--fg);
  text-rendering: optimizeLegibility;
}

.container {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

.site-header {
  position: sticky;
  top: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(6px);
  z-index: 10;
}

.nav {
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
}

.brand a {
  color: var(--fg);
  text-decoration: none;
  font-weight: 600;
}

.links a {
  margin-left: 1rem;
  color: var(--fg);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
}

.links a:hover { background: var(--code-bg); }
.links a.active {
  color: var(--accent);
  font-weight: 600;
}

h1, h2, h3, h4 { line-height: 1.25; }
h1 { font-size: 2rem; margin: 0 0 1rem; }
h2 { font-size: 1.5rem; margin: 2rem 0 0.5rem; }
h3 { font-size: 1.25rem; margin: 1.5rem 0 0.5rem; }

p { margin: 0.75rem 0; }
blockquote {
  margin: 1rem 0;
  padding: 0.5rem 1rem;
  border-left: 3px solid var(--border);
  color: var(--muted);
}

code, pre { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; }
pre {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 8px;
  overflow-x: auto;
  border: 1px solid var(--border);
}
code { background: var(--code-bg); padding: 0.1rem 0.35rem; border-radius: 4px; }

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

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

.post .meta { color: var(--muted); margin-bottom: 1rem; }

.post-card { padding: 1rem 0; border-bottom: 1px solid var(--border); }
.post-card h2 { margin: 0; font-size: 1.25rem; }
.post-card .meta { color: var(--muted); font-size: 0.9rem; margin: 0.25rem 0 0.5rem; }

a { color: var(--accent); }
a:hover { opacity: 0.9; }

ul, ol { padding-left: 1.25rem; }

img { max-width: 100%; height: auto; border-radius: 6px; }

table { border-collapse: collapse; width: 100%; }
td, th { border: 1px solid var(--border); padding: 0.5rem; text-align: left; }