:root{
  --bg: #ffffff;
  --fg: #111827;
  --muted: #6b7280;
  --card: #f8fafc;
  --border: #e5e7eb;
  --link: #1d4ed8;
  --link-hover: #1e40af;
  --shadow: 0 6px 20px rgba(0,0,0,.08);
  --radius: 14px;
  --maxw: 1050px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0b1220;
    --fg:#e5e7eb;
    --muted:#9ca3af;
    --card:#0f1a2e;
    --border:#1f2a44;
    --link:#93c5fd;
    --link-hover:#bfdbfe;
    --shadow: 0 10px 28px rgba(0,0,0,.35);
  }
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--fg);
  line-height: 1.55;
}
a{color:var(--link); text-decoration: none}
a:hover{color:var(--link-hover); text-decoration: underline}
.container{max-width: var(--maxw); margin:0 auto; padding: 0 18px}
.skip-link{
  position:absolute; left:-999px; top:0;
  background: var(--fg); color: var(--bg);
  padding:10px 14px; border-radius: 10px;
}
.skip-link:focus{left:12px; top:12px; z-index: 9999}
.site-header{
  position: sticky; top:0; z-index:50;
  background: rgba(255,255,255,.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
@media (prefers-color-scheme: dark){
  .site-header{background: rgba(11,18,32,.75)}
}
.header-inner{
  display:flex; align-items:center; gap:16px;
  padding: 14px 0;
}
.brand{flex:1}
.brand-link{display:flex; flex-direction:column; gap:2px}
.brand-title{font-weight: 800; letter-spacing: .2px}
.brand-subtitle{font-size: 13px; color: var(--muted)}
.site-nav{
  display:flex; flex-wrap:wrap; gap: 10px;
  align-items:center; justify-content:flex-end;
}
.nav-link{
  font-size: 14px;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid transparent;
}
.nav-link[aria-current="page"]{
  border-color: var(--border);
  background: rgba(0,0,0,.04);
}
@media (prefers-color-scheme: dark){
  .nav-link[aria-current="page"]{background: rgba(255,255,255,.07)}
}
.nav-toggle{
  display:none;
  border: 1px solid var(--border);
  background: transparent;
  border-radius: 12px;
  padding: 10px 12px;
}
.hamburger{
  display:block;
  width:18px; height:2px;
  background: var(--fg);
  position: relative;
}
.hamburger::before,.hamburger::after{
  content:"";
  position:absolute; left:0;
  width:18px; height:2px;
  background: var(--fg);
}
.hamburger::before{top:-6px}
.hamburger::after{top:6px}
.sr-only{position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0}

.content{padding: 22px 0 42px}
h1,h2,h3{line-height:1.2; margin: 0.6em 0 0.35em}
h1{font-size: 2.0rem}
h2{font-size: 1.4rem}
h3{font-size: 1.15rem}
p{margin: .4em 0 1em}
hr{border:0; border-top:1px solid var(--border); margin: 22px 0}
.card-grid{
  display:grid;
  grid-template-columns: repeat(12,1fr);
  gap: 14px;
}
.card{
  grid-column: span 6;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}
.card h2{margin-top:0}
.card p{color: var(--muted)}
@media (max-width: 860px){
  .card{grid-column: span 12}
}
.kicker{color: var(--muted); font-weight: 600; letter-spacing: .2px}
.hero{
  background: linear-gradient(120deg, rgba(29,78,216,.10), rgba(16,185,129,.08));
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  padding: 18px;
  box-shadow: var(--shadow);
  margin-bottom: 18px;
}
.hero-title{margin:0 0 6px}
.hero-meta{color: var(--muted); margin:0}
.badge{
  display:inline-block;
  font-size: 12px;
  padding: 4px 9px;
  border-radius: 999px;
  background: rgba(0,0,0,.06);
  border: 1px solid var(--border);
  margin-right: 8px;
}
@media (prefers-color-scheme: dark){
  .badge{background: rgba(255,255,255,.08)}
}
ul{padding-left: 1.1em}
li{margin: .35em 0}
table{
  width:100%;
  border-collapse: collapse;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow:hidden;
}
th,td{
  padding: 10px 10px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
th{
  text-align:left;
  font-size: 13px;
  color: var(--muted);
  background: rgba(0,0,0,.03);
}
@media (prefers-color-scheme: dark){
  th{background: rgba(255,255,255,.06)}
}
.table-wrap{overflow:auto; border-radius: 12px}
code,pre{font-family: var(--mono)}
pre{
  padding: 14px;
  background: rgba(0,0,0,.04);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow:auto;
}
@media (prefers-color-scheme: dark){
  pre{background: rgba(255,255,255,.06)}
}
.site-footer{
  border-top: 1px solid var(--border);
  padding: 18px 0;
  color: var(--muted);
}
.footer-inner{
  display:flex; justify-content:space-between; gap: 12px;
  flex-wrap: wrap;
}
.footer-links a{color: var(--muted); margin-left: 10px}
.notice{
  border-left: 4px solid rgba(29,78,216,.7);
  background: rgba(29,78,216,.08);
  padding: 12px 14px;
  border-radius: 12px;
  margin: 14px 0;
}