:root{
  --bg:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --card:#f8fafc;
  --border:rgba(17,24,39,.10);
  --link:#1d4ed8;

  --content-max:74ch;
  --radius:16px;

  --font-sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Inter, Arial, sans-serif;
  --font-serif: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
}

html[data-theme="dark"]{
  --bg:#0b1220;
  --text:#e5e7eb;
  --muted:#9ca3af;
  --card:rgba(255,255,255,.04);
  --border:rgba(229,231,235,.12);
  --link:#93c5fd;
}

*{box-sizing:border-box}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}

.container{
  max-width:var(--content-max);
  margin:0 auto;
  padding:24px 18px;
}

.site-header{
  position:sticky;
  top:0;
  background:color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter:saturate(160%) blur(8px);
  border-bottom:1px solid var(--border);
  z-index:10;
}

.header-inner{
  max-width:var(--content-max);
  margin:0 auto;
  padding:14px 18px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}

.brand{
  font-weight:700;
  letter-spacing:-0.01em;
  color:var(--text);
}

.header-actions{display:flex;align-items:center;gap:10px}

.theme-toggle{
  border:1px solid var(--border);
  background:var(--card);
  color:var(--text);
  border-radius:999px;
  padding:8px 10px;
  cursor:pointer;
  line-height:1;
}

.theme-toggle:focus{outline:2px solid color-mix(in srgb, var(--link) 55%, transparent); outline-offset:2px}

.page-title{
  font-family:var(--font-serif);
  font-size:2rem;
  line-height:1.15;
  letter-spacing:-0.015em;
  margin:0 0 10px;
}

.muted{color:var(--muted)}

.lede{
  border:1px solid var(--border);
  background:var(--card);
  border-radius:var(--radius);
  padding:14px 16px;
  margin:14px 0 22px;
  color:var(--muted);
}

.content h2{
  font-family:var(--font-serif);
  margin:30px 0 10px;
  line-height:1.2;
  letter-spacing:-0.01em;
}

.content p{margin:12px 0}
.content ul{margin:10px 0 14px 1.2rem}
.content li{margin:6px 0}

.cards{
  display:grid;
  grid-template-columns:1fr;
  gap:12px;
  margin-top:18px;
}

@media (min-width: 820px){
  .cards{grid-template-columns:1fr 1fr}
}

.card{
  display:block;
  padding:14px 14px 12px;
  border:1px solid var(--border);
  border-radius:var(--radius);
  background:var(--card);
  color:var(--text);
  transition:transform .08s ease, border-color .08s ease;
}
.card:hover{
  text-decoration:none;
  transform:translateY(-1px);
  border-color:color-mix(in srgb, var(--border) 35%, var(--link));
}

.card-title{
  font-weight:650;
  letter-spacing:-0.01em;
  margin-bottom:6px;
}

.card-summary{
  color:var(--muted);
  font-size:.97rem;
  line-height:1.55;
}

.related{
  margin-top:34px;
  padding-top:18px;
  border-top:1px solid var(--border);
}

.related-title{
  font-family:var(--font-serif);
  margin:0 0 6px;
}

.site-footer{
  border-top:1px solid var(--border);
  margin-top:42px;
}

.footer-inner{padding-top:18px;padding-bottom:22px}