:root {
  --bg: #ffffff;
  --fg: #1f2328;
  --muted: #656d76;
  --border: #d0d7de;
  --accent: #0969da;
  --code-bg: #f6f8fa;
  --max: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #e6edf3;
    --muted: #8b949e;
    --border: #30363d;
    --accent: #58a6ff;
    --code-bg: #161b22;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

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

.wrap {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--fg);
  text-decoration: none;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 18px;
  font-size: 0.95rem;
}

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

main { padding: 48px 0 64px; }

.intro h1 { font-size: 2rem; margin: 0 0 12px; }
.intro p { color: var(--muted); font-size: 1.1rem; max-width: 580px; }

.posts { margin-top: 56px; }
.posts h2 { font-size: 1.2rem; border-bottom: 1px solid var(--border); padding-bottom: 8px; }

.post-list { list-style: none; padding: 0; margin: 24px 0 0; }
.post-list li { margin-bottom: 32px; }

.post-list a {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--fg);
}

.post-title { font-weight: 600; font-size: 1.15rem; }
.post-title:hover { color: var(--accent); }
.post-date { color: var(--muted); font-size: 0.85rem; margin-top: 2px; }
.post-list p { color: var(--muted); margin: 8px 0 0; }

.prose h1 { font-size: 1.9rem; margin: 6px 0 20px; line-height: 1.25; }
.prose h2 { font-size: 1.3rem; margin: 36px 0 12px; }
.prose p, .prose ul { margin: 14px 0; }
.prose ul { padding-left: 22px; }
.prose a { color: var(--accent); }

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  font-size: 0.9rem;
}

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer p { margin: 0; }