:root {
  --bg: #fafaf8;
  --surface: #ffffff;
  --text: #1c1f24;
  --muted: #5a6370;
  --border: #e5e7eb;
  --accent: #1d4ed8;
  --accent-soft: #eff6ff;
  --code-bg: #f3f4f6;
  --radius: 10px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --surface: #181b21;
    --text: #e6e9ef;
    --muted: #9aa4b2;
    --border: #262b34;
    --accent: #60a5fa;
    --accent-soft: rgba(96, 165, 250, 0.12);
    --code-bg: #1f242d;
  }
}

* { box-sizing: border-box; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.72;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 740px;
  margin: 0 auto;
  padding: 0 20px;
}

header.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  max-width: 740px;
  margin: 0 auto;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.08rem;
  color: var(--text);
}
.brand:hover { text-decoration: none; }
nav.site-nav {
  display: flex;
  gap: 20px;
  font-size: 0.94rem;
}
nav.site-nav a { color: var(--muted); font-weight: 500; }
nav.site-nav a:hover, nav.site-nav a.active { color: var(--text); text-decoration: none; }

main { padding: 40px 0 64px; }

.hero {
  margin-bottom: 34px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--border);
}
.hero h1 {
  margin: 0 0 10px;
  font-size: 1.85rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
}
.hero p {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}
.filter-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  border-radius: 999px;
  padding: 5px 13px;
  font-size: 0.86rem;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s ease;
}
.filter-btn:hover { border-color: var(--accent); color: var(--text); }
.filter-btn.active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
  font-weight: 600;
}

.post-list {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.post-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  transition: border-color 0.15s ease;
}
.post-card:hover { border-color: var(--accent); }
.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 0.84rem;
  color: var(--muted);
  margin-bottom: 8px;
}
.tag-pill {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
}
.post-card h2 {
  margin: 0 0 8px;
  font-size: 1.24rem;
  line-height: 1.35;
}
.post-card h2 a { color: var(--text); }
.post-card h2 a:hover { color: var(--accent); text-decoration: none; }
.post-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}

article.prose h1 {
  margin: 8px 0 12px;
  font-size: 1.9rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
}
article.prose h2 {
  margin: 30px 0 10px;
  font-size: 1.28rem;
  line-height: 1.35;
}
article.prose p { margin: 0 0 16px; }
article.prose ul, article.prose ol { margin: 0 0 16px; padding-left: 22px; }
article.prose li { margin-bottom: 6px; }
article.prose code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 5px;
}
article.prose pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  overflow-x: auto;
  margin: 16px 0 20px;
}
article.prose pre code {
  background: transparent;
  padding: 0;
  font-size: 0.86rem;
  line-height: 1.55;
}

.back-link {
  display: inline-block;
  margin-bottom: 18px;
  font-size: 0.9rem;
  color: var(--muted);
}
.archive-group { margin-bottom: 28px; }
.archive-group h2 {
  font-size: 1.05rem;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
  margin-bottom: 12px;
}
.archive-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 0;
}
.archive-row time { color: var(--muted); font-size: 0.9rem; flex-shrink: 0; }

footer.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0 36px;
  color: var(--muted);
  font-size: 0.86rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
}