:root{
  --bg: #0b0f18;
  --bg2:#0f172a;
  --card:#101a33cc;
  --text:#e8eefc;
  --muted:#b6c2e2;
  --muted2:#94a3b8;
  --border:#273454;
  --accent:#7c3aed;
  --accent2:#06b6d4;
  --ring: 0 0 0 4px rgba(124,58,237,.25);
  --radius: 18px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --max: 920px;
}
@media (prefers-color-scheme: light){
  :root{
    --bg:#f7f8fe;
    --bg2:#ffffff;
    --card:#ffffffcc;
    --text:#0f172a;
    --muted:#334155;
    --muted2:#475569;
    --border:#e2e8f0;
    --ring: 0 0 0 4px rgba(124,58,237,.18);
  }
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--font);
  color:var(--text);
  background:
    radial-gradient(1200px 700px at 15% 10%, rgba(124,58,237,.28), transparent 55%),
    radial-gradient(1000px 600px at 85% 15%, rgba(6,182,212,.20), transparent 55%),
    linear-gradient(180deg, var(--bg), var(--bg2));
  line-height:1.6;
  background-attachment: fixed;
  overflow:hidden;
}

.shell{
  height:100vh;
  overflow-y:auto;
  overflow-x:hidden;
  -webkit-overflow-scrolling: touch;
}
a{color:inherit}
a:hover{opacity:.92}
a:focus-visible{outline:none; box-shadow: var(--ring); border-radius: 10px}

.topbar{
  position:sticky; top:0; z-index:10;
  backdrop-filter: blur(12px);
  background: linear-gradient(180deg, rgba(15,23,42,.70), rgba(15,23,42,.30));
  border-bottom: 1px solid rgba(39,52,84,.35);
}
@media (prefers-color-scheme: light){
  .topbar{
    background: linear-gradient(180deg, rgba(255,255,255,.85), rgba(255,255,255,.60));
    border-bottom: 1px solid rgba(226,232,240,.8);
  }
}
.topbar-inner{
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 18px;
  display:flex; align-items:center; justify-content:space-between;
  gap: 12px;
}
.topbar-brand{
  text-decoration:none;
  font-weight:800;
  letter-spacing:.2px;
}
.topbar-links{display:flex; gap: 10px; flex-wrap:wrap}
.topbar-links a{
  text-decoration:none;
  color: var(--muted);
  font-weight:700;
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid rgba(39,52,84,.45);
  background: rgba(16,26,51,.35);
}
@media (prefers-color-scheme: light){
  .topbar-links a{border:1px solid rgba(226,232,240,.95); background: rgba(255,255,255,.75)}
}
.topbar-links a:hover{color:var(--text)}

.content{
  max-width: var(--max);
  margin: 0 auto;
  padding: 24px 18px 52px;
}

h1{
  font-size: clamp(28px, 3.6vw, 40px);
  line-height:1.1;
  letter-spacing:-.02em;
}
h2{margin-top: 26px}
h3{margin-top: 18px}

p,li{color: var(--muted)}
.small{color: var(--muted2)}
.note{
  border:1px solid rgba(39,52,84,.55);
  background: rgba(16,26,51,.40);
  border-radius: var(--radius);
  padding: 14px 16px;
  color: var(--muted);
}
@media (prefers-color-scheme: light){
  .note{background: rgba(255,255,255,.80); border:1px solid rgba(226,232,240,.95)}
}
pre{
  overflow:auto;
  border-radius: var(--radius);
  border:1px solid rgba(39,52,84,.55);
  background: rgba(2,6,23,.35);
  padding: 14px 16px;
}
@media (prefers-color-scheme: light){
  pre{background: rgba(241,245,249,.90); border:1px solid rgba(226,232,240,.95)}
}
code{font-family: var(--mono); font-size: 13px}
hr{border:0; height:1px; background: linear-gradient(90deg, transparent, rgba(148,163,184,.55), transparent); margin: 18px 0; opacity:.7}