:root{
  --bg:#0b0f15;
  --card:#0f1720;
  --muted:#9aa4b2;
  --accent:#1b9fff;
  --text:#e6eef6;
  --radius:10px;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Segoe UI, Roboto, Arial, sans-serif;background:linear-gradient(180deg,#071021,#05060a);color:var(--text);-webkit-font-smoothing:antialiased}
.site-header{display:flex;align-items:center;gap:12px;padding:14px 18px;background:linear-gradient(90deg,#07101a,#071b2a);position:sticky;top:0;z-index:50}
.brand{display:flex;flex-direction:column;text-decoration:none;color:inherit}
.logo{font-weight:700;font-size:18px;color:var(--accent)}
.tag{font-size:12px;color:var(--muted)}
.burger{font-size:22px;background:none;border:0;color:var(--text);cursor:pointer;padding:6px 8px;border-radius:8px}
.container{max-width:1100px;margin:18px auto;padding:12px}
.hero h1{margin:0;font-size:28px}
.lead{color:var(--muted);margin-top:6px}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:14px}
.card{display:block;padding:16px;background:linear-gradient(180deg,rgba(255,255,255,0.02),rgba(255,255,255,0.01));border-radius:var(--radius);text-decoration:none;color:var(--text);box-shadow:0 8px 30px rgba(0,0,0,0.6);border:1px solid rgba(255,255,255,0.02)}
.card-title{font-weight:600}
.card-sub{color:var(--muted);font-size:13px;margin-top:6px}
.two-col{display:grid;grid-template-columns:1fr 320px;gap:18px}
.box{background:var(--card);padding:20px;border-radius:12px;box-shadow:0 10px 30px rgba(0,0,0,0.6)}
.sidebar{position:relative}
.related ul{list-style:none;padding:0;margin:0}
.related li{margin:8px 0}
.overlay{display:none;position:fixed;z-index:9999;left:0;top:0;width:100%;height:100%;background:rgba(2,6,23,0.95);color:white;padding:36px;overflow:auto}
.overlay nav ul{list-style:none;padding:0;margin:0}
.overlay a{display:block;padding:12px 0;font-size:20px;color:var(--text);text-decoration:none;border-bottom:1px solid rgba(255,255,255,0.03)}
.closebtn{position:fixed;right:16px;top:8px;background:none;border:0;color:white;font-size:40px;cursor:pointer}
pre{background:#071226;padding:12px;border-radius:8px;overflow:auto;font-family:ui-monospace,monospace}
.copy-btn{margin-top:8px;padding:8px 12px;border-radius:8px;border:0;background:var(--accent);color:white;cursor:pointer}
kbd{background:rgba(255,255,255,0.04);padding:3px 6px;border-radius:4px;border:1px solid rgba(255,255,255,0.03);font-family:ui-monospace,monospace}
@media (max-width:900px){
  .grid{grid-template-columns:1fr}
  .two-col{grid-template-columns:1fr}
}
a {
  position: relative;
  color: #1a9fff;
  text-decoration: none;
}

a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: #1a9fff;
  transition: 0.3s ease;
}

a:hover::after {
  width: 100%;
}