:root{
  --bg:#0b0c10;
  --panel:#11141b;
  --ink:#e9eef7;
  --muted:#a7b0c0;
  --border:#232733;
  --accent:#6ee7ff;
  --accent-2:#ff6a88;
  --radius:14px;
  --shadow:0 10px 30px rgba(0,0,0,.35);
  --nav-w:280px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,Helvetica,sans-serif;
  color:var(--ink);
  background:
    radial-gradient(1200px 600px at 8% -20%, #1b2230 0%, transparent 60%),
    radial-gradient(900px 500px at 110% 10%, #1a1f2a 0%, transparent 55%),
    var(--bg);
  line-height:1.7;
  font-size:18px;
}

#navbar{
  position:fixed;
  top:0; left:0;
  width:var(--nav-w);
  height:100vh;
  padding:18px;
  background:linear-gradient(180deg,rgba(255,255,255,.02),rgba(255,255,255,0)),var(--panel);
  border-right:1px solid var(--border);
  box-shadow:var(--shadow);
  overflow:auto;
}
.nav-header{
  font-weight:800;
  font-size:1.1rem;
  margin:4px 0 10px;
  color:#d6def0;
}
.nav-link{
  display:block;
  padding:.55rem .7rem;
  margin:.35rem 0;
  border:1px solid #2b3140;
  border-radius:.6rem;
  color:#cfd7ea;
  text-decoration:none;
  transition:transform .05s ease, background .15s ease, border-color .15s ease;
}
.nav-link:hover{ background:#151a24; border-color:#3a4253 }
.nav-link.active{
  background:linear-gradient(135deg,var(--accent),#85f3ff);
  color:#0a0d12;
  border-color:transparent;
  font-weight:800;
}

#main-doc{
  margin-left:var(--nav-w);
  padding:28px 20px 50px;
  max-width:980px;
}

.main-section{
  background:linear-gradient(180deg,rgba(255,255,255,.02),rgba(255,255,255,0)),var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:22px;
  margin:18px 12px;
  box-shadow:var(--shadow);
}
.main-section > header{
  font-weight:800;
  font-size:1.4rem;
  letter-spacing:.2px;
  margin:0 0 10px;
}

p{ margin:.4rem 0 .9rem }
ul{ margin:.3rem 0 .9rem 1.1rem }

pre{
  margin:.7rem 0 1rem;
  background:#0f1218;
  border:1px solid #2c3342;
  border-radius:12px;
  padding:14px;
  overflow:auto;
}
code{
  font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;
  font-size:.95em;
}
pre code{ color:#d6e1ff }
code:not(pre code){
  background:#0f1218;
  border:1px solid #2c3342;
  border-radius:.4rem;
  padding:.08rem .35rem;
  color:#e7eeff;
}

.demo{
  display:flex;
  align-items:center;
  gap:10px;
  margin-top:.6rem;
}
.btn{
  border:0;
  border-radius:.6rem;
  padding:.6rem .9rem;
  background:linear-gradient(135deg,var(--accent-2),#ff8aa1);
  color:#fff;
  font-weight:800;
  cursor:pointer;
}
.badge{
  display:inline-block;
  padding:.35rem .6rem;
  border-radius:999px;
  background:#0e1117;
  border:1px solid #343b4c;
  color:#c9d3e9;
}
.badge.ok{ background:#0f1f14; border-color:#235e38; color:#b8f5cf }

@media (max-width: 900px){
  :root{ --nav-w:100% }
  #navbar{
    position:sticky;
    height:auto;
    top:0;
    display:flex;
    align-items:center;
    gap:8px;
    flex-wrap:nowrap;
    overflow:auto;
  }
  .nav-link{
    display:inline-block;
    white-space:nowrap;
    margin:.35rem .5rem .35rem 0;
  }
  #main-doc{ margin-left:0; padding-top:16px }
}