:root{
  --bg:#0b0d12;
  --paper:#0f1420;
  --card:#121a2a;
  --ink:#eef2ff;
  --muted:#b9c2e6;
  --faint:#7f8bb8;
  --line:rgba(255,255,255,.10);
  --accent:#a6ffcb;
  --accent2:#ffd6a6;
  --radius:18px;
  --shadow:0 18px 60px rgba(0,0,0,.45);
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --serif: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Liberation Sans", sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:
    radial-gradient(1100px 700px at 18% -10%, rgba(166,255,203,.22), transparent 55%),
    radial-gradient(900px 600px at 92% 10%, rgba(255,214,166,.18), transparent 56%),
    radial-gradient(700px 500px at 85% 95%, rgba(157,128,255,.14), transparent 58%),
    linear-gradient(180deg, var(--bg), #07080c 55%, #06060a);
  color:var(--ink);
  font-family:var(--sans);
  line-height:1.6;
}

a{color:inherit; text-decoration:none}
a:hover{opacity:.95}
img{max-width:100%; height:auto; display:block}

.skip-link{
  position:absolute; left:-9999px; top:auto;
  width:1px;height:1px;overflow:hidden;
}
.skip-link:focus{
  left:14px; top:14px; width:auto; height:auto;
  padding:10px 12px;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:12px;
  z-index:9999;
}

.shell{
  display:grid;
  grid-template-columns: 300px minmax(0,1fr);
  min-height:100vh;
}

.rail{
  position:sticky; top:0; height:100vh;
  padding:18px 14px;
  border-right:1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,.00));
  overflow:auto;
}

.brand{
  display:block;
  padding:14px 14px 12px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:rgba(18,26,42,.55);
  box-shadow: var(--shadow);
}
.brand strong{
  display:block;
  font-family:var(--serif);
  letter-spacing:.2px;
  font-size:22px;
  line-height:1.1;
}
.brand span{
  display:block;
  margin-top:6px;
  color:var(--muted);
  font-size:13px;
}

.rail .nav{
  margin-top:14px;
  padding:10px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:rgba(18,26,42,.35);
}
.rail .nav a{
  display:flex;
  gap:10px;
  align-items:center;
  padding:10px 10px;
  border-radius:14px;
  color:var(--muted);
  font-size:14px;
}
.rail .nav a:hover{background:rgba(255,255,255,.06); color:var(--ink)}
.rail .nav a[aria-current="page"]{background:rgba(166,255,203,.10); color:var(--ink); border:1px solid rgba(166,255,203,.20)}

.pill{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--mono);
  font-size:12px;
  padding:8px 10px;
  border-radius:999px;
  border:1px solid var(--line);
  color:var(--muted);
  background:rgba(18,26,42,.25);
}
.pill b{color:var(--accent); font-weight:700}
.pills{display:flex; flex-wrap:wrap; gap:8px; margin-top:12px; padding:0 6px 4px}

.rail .box{
  margin-top:12px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:12px 12px;
  background:rgba(18,26,42,.25);
}
.box h3{
  margin:0 0 8px;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--faint);
}
.box a{
  display:block;
  padding:8px 10px;
  border-radius:14px;
  color:var(--muted);
  font-size:14px;
}
.box a:hover{background:rgba(255,255,255,.06); color:var(--ink)}

#toc{margin-top:10px}
#toc a{font-size:13px}
#toc .lvl3{padding-left:18px; color:var(--faint)}

.page{
  padding:18px 18px 54px;
}

.topbar{
  position:sticky; top:0;
  z-index:20;
  backdrop-filter: blur(10px);
  background: rgba(11,13,18,.55);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:12px 12px;
  display:flex;
  gap:12px;
  align-items:center;
  justify-content:space-between;
  box-shadow: 0 10px 40px rgba(0,0,0,.35);
}

.kbd{
  font-family:var(--mono);
  font-size:12px;
  color:var(--muted);
  border:1px solid var(--line);
  background:rgba(255,255,255,.04);
  padding:6px 10px;
  border-radius:12px;
}

.search{
  display:flex; align-items:center; gap:10px;
  flex:1;
  max-width:720px;
}
.search input{
  width:100%;
  padding:12px 12px;
  border-radius:14px;
  border:1px solid var(--line);
  background:rgba(18,26,42,.35);
  color:var(--ink);
  outline:none;
}
.search input::placeholder{color:var(--faint)}
.search button{
  padding:11px 12px;
  border-radius:14px;
  border:1px solid rgba(166,255,203,.22);
  background:rgba(166,255,203,.10);
  color:var(--ink);
  cursor:pointer;
  font-family:var(--mono);
}

.content{
  margin-top:16px;
  display:grid;
  grid-template-columns: minmax(0,1fr) 340px;
  gap:16px;
  align-items:start;
}

.article{
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:rgba(18,26,42,.30);
  padding:22px 22px;
  box-shadow: var(--shadow);
}

.sidebar{
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:rgba(18,26,42,.18);
  padding:16px 16px;
  position:sticky;
  top:92px;
}

h1,h2,h3{font-family:var(--serif); letter-spacing:.2px; margin:0 0 10px}
h1{font-size:clamp(28px, 3vw, 44px); line-height:1.15}
h2{font-size:clamp(20px, 2.2vw, 28px); margin-top:22px}
h3{font-size:18px; margin-top:18px}
p{margin:0 0 14px; color:var(--muted)}
.article p{color:var(--muted)}

.lede{
  font-size:16px;
  color:var(--ink);
  opacity:.92;
}

.meta-row{
  display:flex; flex-wrap:wrap; gap:10px;
  margin:14px 0 18px;
}

.btn{
  display:inline-flex; align-items:center; justify-content:center;
  padding:12px 14px;
  border-radius:16px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.04);
  color:var(--ink);
  font-family:var(--mono);
  font-size:13px;
}
.btn.primary{
  border-color:rgba(166,255,203,.30);
  background:linear-gradient(180deg, rgba(166,255,203,.18), rgba(166,255,203,.08));
}

.grid-cards{
  display:grid;
  grid-template-columns: repeat(12, 1fr);
  gap:12px;
  margin-top:14px;
}
.card{
  grid-column: span 6;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:rgba(18,26,42,.22);
  padding:14px 14px;
}
.card h3{margin-top:0}
.card p{margin-bottom:0}
.card .thumb{
  border-radius:16px;
  border:1px solid var(--line);
  overflow:hidden;
  margin-bottom:10px;
}

.flow{
  border:1px solid rgba(255,214,166,.20);
  background:rgba(255,214,166,.06);
  border-radius:var(--radius);
  padding:14px 14px;
  margin-top:14px;
}
.flow label{display:block; font-family:var(--mono); color:var(--faint); font-size:12px; letter-spacing:.08em; text-transform:uppercase; margin-bottom:6px}
.flow select{
  width:100%;
  padding:12px 12px;
  border-radius:14px;
  border:1px solid var(--line);
  background:rgba(18,26,42,.35);
  color:var(--ink);
}
.flow .result{
  margin-top:10px;
  padding:12px 12px;
  border-radius:14px;
  border:1px dashed rgba(166,255,203,.25);
  color:var(--muted);
}

.footer{
  margin-top:16px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:16px 16px;
  background:rgba(18,26,42,.18);
  color:var(--faint);
  font-size:13px;
}
.footer a{color:var(--muted); text-decoration:underline; text-underline-offset:3px}

@media (max-width: 1040px){
  .shell{grid-template-columns: 1fr}
  .rail{position:relative; height:auto; border-right:none; border-bottom:1px solid var(--line)}
  .content{grid-template-columns: 1fr}
  .sidebar{position:relative; top:auto}
}