:root{
  --bg:#0b1220;
  --card:#0f1b31;
  --muted:#9db0d1;
  --text:#e9f0ff;
  --accent:#27c4ff;
  --accent2:#7c3aed;
  --border: rgba(255,255,255,.08);
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial; background:linear-gradient(135deg,#06101f,#0b1220); color:var(--text);}
a{color:inherit;text-decoration:none}
.container{max-width:1200px;margin:0 auto;padding:18px;}
.topbar{position:sticky;top:0;z-index:50;background:rgba(10,18,34,.75);backdrop-filter: blur(12px);border-bottom:1px solid var(--border);}
.brand{display:flex;gap:10px;align-items:center;font-weight:700;}
.pill{display:inline-flex;gap:8px;align-items:center;padding:8px 12px;border:1px solid var(--border);border-radius:999px;background:rgba(255,255,255,.03)}
.grid{display:grid;grid-template-columns: 280px 1fr;gap:16px;align-items:start;}
.card{background:rgba(255,255,255,.03);border:1px solid var(--border);border-radius:18px;box-shadow:0 10px 30px rgba(0,0,0,.25);}
.card h3{margin:0 0 10px 0;font-size:14px;color:var(--muted);letter-spacing:.2px}
.sidebar{padding:14px;position:sticky;top:72px;max-height:calc(100vh - 92px);overflow:auto;}
.content{padding:18px;min-height:60vh;}
.kbd{font-family:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; font-size:12px; padding:2px 6px;border:1px solid var(--border);border-radius:6px;background:rgba(0,0,0,.25);color:#d7e3ff;}
.list{display:flex;flex-direction:column;gap:6px;}
.item{padding:10px 12px;border-radius:12px;border:1px solid transparent;}
.item:hover{border-color: var(--border); background:rgba(255,255,255,.02)}
.item.active{border-color:rgba(39,196,255,.35); background:rgba(39,196,255,.10)}
.small{font-size:12px;color:var(--muted)}
.btn{display:inline-flex;gap:8px;align-items:center;padding:10px 14px;border-radius:12px;border:1px solid var(--border);background:rgba(255,255,255,.04);cursor:pointer}
.btn:hover{border-color:rgba(39,196,255,.35)}
.badge{display:inline-flex;align-items:center;padding:4px 10px;border-radius:999px;border:1px solid var(--border);color:var(--muted);font-size:12px}
.hero{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px;border-radius:20px;background:linear-gradient(135deg,rgba(39,196,255,.12),rgba(124,58,237,.12));border:1px solid rgba(255,255,255,.08)}
.hero h1{margin:0;font-size:22px}
.hero p{margin:4px 0 0 0;color:var(--muted)}
.split{display:grid;grid-template-columns:1fr;gap:12px}
@media (max-width: 980px){ .grid{grid-template-columns:1fr} .sidebar{position:relative;top:0;max-height:none} }
.toc a{display:block;padding:8px 10px;border-radius:10px;color:var(--muted);font-size:13px}
.toc a:hover{background:rgba(255,255,255,.03);color:var(--text)}
.toc a.active{background:rgba(39,196,255,.10);color:var(--text);border:1px solid rgba(39,196,255,.25)}
.article h1{margin-top:0}
.article h2,.article h3{scroll-margin-top:90px}
.article pre{background:rgba(0,0,0,.35);padding:12px;border-radius:14px;border:1px solid var(--border);overflow:auto}
.article code{font-family:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;}
.compiler{border-top:1px solid var(--border);padding-top:12px;margin-top:16px}
textarea{width:100%;min-height:140px;border-radius:14px;border:1px solid var(--border);background:rgba(0,0,0,.25);color:var(--text);padding:12px;font-family:ui-monospace;font-size:13px;outline:none}
.output{white-space:pre-wrap;background:rgba(0,0,0,.35);padding:12px;border-radius:14px;border:1px solid var(--border);min-height:80px}