:root{
  --bg: #0C1116;
  --surface: #121922;
  --surface-2: #17202B;
  --border: #232E3A;
  --text: #E7EDF3;
  --text-dim: #8C9AA8;
  --text-faint: #56636F;
  --accent: #4FD1AE;
  --accent-dim: #2E7C68;
  --amber: #E8B94F;
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}
*{box-sizing:border-box; margin:0; padding:0;}
html{scroll-behavior:smooth;}
body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:'';
  position:fixed; inset:0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity:0.15;
  pointer-events:none;
  z-index:0;
}
.wrap{max-width:1100px; margin:0 auto; padding:0 28px; position:relative; z-index:1;}
a{color:inherit; text-decoration:none;}
::selection{background:var(--accent-dim); color:#fff;}

/* nav */
nav{
  position:sticky; top:0; z-index:50;
  background:rgba(12,17,22,0.85);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
}
nav .wrap{display:flex; align-items:center; justify-content:space-between; height:64px;}
.brand{display:flex; align-items:center; gap:10px; font-family:var(--font-display); font-weight:600; font-size:16px;}
.brand-logo{width:24px; height:24px; object-fit:contain;}
.brand-sub{font-size:11px; color:var(--text-faint); font-weight:400; margin-left:2px;}
.brand-dot{width:8px; height:8px; border-radius:50%; background:var(--accent); box-shadow:0 0 8px var(--accent);}
.navlinks{display:flex; gap:32px; font-size:14px; color:var(--text-dim);}
.navlinks a:hover{color:var(--accent);}
.navlinks a.active{color:var(--text);}
@media (max-width:720px){ .navlinks{display:none;} }

/* page header (subpages) */
.page-header{padding:56px 0 40px; border-bottom:1px solid var(--border);}
.eyebrow{
  font-family:var(--font-mono); font-size:12px; color:var(--accent);
  display:flex; align-items:center; gap:8px; margin-bottom:16px; letter-spacing:0.02em;
}
.eyebrow::before{content:'//'; color:var(--text-faint);}
.page-header h1{
  font-family:var(--font-display); font-weight:700;
  font-size:clamp(28px,4.4vw,40px); line-height:1.18; letter-spacing:-0.02em;
  max-width:720px; margin-bottom:14px;
}
.page-header .lede{color:var(--text-dim); font-size:15px; max-width:620px;}

/* overview hero */
header.overview{padding:88px 0 64px; border-bottom:1px solid var(--border);}
header.overview h1{
  font-family:var(--font-display); font-weight:700;
  font-size:clamp(32px,5vw,48px); line-height:1.15; letter-spacing:-0.02em;
  max-width:720px; margin-bottom:22px;
}
header.overview h1 .accent-text{color:var(--accent);}
header.overview .lede{color:var(--text-dim); font-size:16px; max-width:620px; margin-bottom:36px;}
.overview-actions{display:flex; align-items:center; gap:28px; margin-bottom:56px;}
.doc-link{
  font-size:14px; font-weight:500; color:var(--text); border-bottom:1px solid var(--accent);
  padding-bottom:2px;
}
.doc-link:hover{color:var(--accent);}
.secondary-link{font-size:14px; color:var(--text-dim);}
.secondary-link:hover{color:var(--text);}

/* telemetry readout */
.telemetry{
  display:grid; grid-template-columns:repeat(4,1fr); gap:1px;
  background:var(--border); border:1px solid var(--border); border-radius:6px; overflow:hidden;
}
.telemetry-cell{background:var(--surface); padding:18px 20px;}
.telemetry-label{font-family:var(--font-mono); font-size:11px; color:var(--text-faint); text-transform:uppercase; letter-spacing:0.06em; margin-bottom:8px;}
.telemetry-value{font-family:var(--font-mono); font-size:22px; color:var(--text); font-weight:500;}
.telemetry-value.accent{color:var(--accent);}
@media (max-width:720px){ .telemetry{grid-template-columns:repeat(2,1fr);} }

/* section shell */
section{padding:72px 0; border-bottom:1px solid var(--border);}
main section:last-child{border-bottom:none;}
.section-head{display:flex; align-items:baseline; justify-content:space-between; margin-bottom:36px; gap:24px; flex-wrap:wrap;}
.section-title{font-family:var(--font-display); font-size:26px; font-weight:600; letter-spacing:-0.01em;}
.section-note{font-family:var(--font-mono); font-size:12px; color:var(--text-faint);}

/* stack badges */
.stack-row{display:flex; flex-wrap:wrap; gap:10px;}
.badge{
  font-family:var(--font-mono); font-size:12px; color:var(--text-dim);
  border:1px solid var(--border); padding:7px 12px; border-radius:5px; background:var(--surface);
}

/* docs layout */
.docs-layout{display:grid; grid-template-columns:220px 1fr; gap:0; border:1px solid var(--border); border-radius:8px; overflow:hidden;}
.docs-sidebar{background:var(--surface); border-right:1px solid var(--border); padding:18px 10px;}
.docs-sidebar .group-label{font-family:var(--font-mono); font-size:11px; color:var(--text-faint); text-transform:uppercase; letter-spacing:0.06em; padding:8px 12px 6px;}
.docs-tab{
  display:block; width:100%; text-align:left; background:none; border:none; color:var(--text-dim);
  font-family:var(--font-mono); font-size:13px; padding:9px 12px; border-radius:5px; cursor:pointer;
}
.docs-tab:hover{background:var(--surface-2); color:var(--text);}
.docs-tab.active{background:var(--surface-2); color:var(--accent);}
.docs-content{background:var(--surface); padding:32px 34px;}
.docs-content h4{font-family:var(--font-display); font-size:18px; margin:22px 0 12px; font-weight:600;}
.docs-content h4:first-child{margin-top:0;}
.docs-content p{color:var(--text-dim); font-size:14px; margin-bottom:14px; max-width:640px;}
.docs-content ul{margin:0 0 16px 18px; color:var(--text-dim); font-size:14px;}
.docs-content li{margin-bottom:6px;}
.code-block{
  font-family:var(--font-mono); font-size:13px; background:var(--bg); border:1px solid var(--border);
  border-radius:6px; padding:16px 18px; color:var(--accent); overflow-x:auto; white-space:pre; margin-bottom:16px;
}
.code-block .cm{color:var(--text-faint);}
@media (max-width:720px){ .docs-layout{grid-template-columns:1fr;} .docs-sidebar{display:flex; flex-wrap:wrap; border-right:none; border-bottom:1px solid var(--border);} }

/* component grid */
.grid{display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--border); border:1px solid var(--border); border-radius:8px; overflow:hidden;}
.card{background:var(--surface); padding:26px 24px;}
.card-icon{width:34px; height:34px; margin-bottom:16px; color:var(--accent);}
.card h5{font-family:var(--font-display); font-size:15px; font-weight:600; margin-bottom:8px;}
.card p{color:var(--text-dim); font-size:13px;}
.card .tags{margin-top:12px; display:flex; gap:6px; flex-wrap:wrap;}
.card .tag{font-family:var(--font-mono); font-size:10px; color:var(--text-faint); border:1px solid var(--border); padding:3px 7px; border-radius:4px;}
@media (max-width:820px){ .grid{grid-template-columns:1fr 1fr;} }
@media (max-width:560px){ .grid{grid-template-columns:1fr;} }

/* architecture */
.arch-list{display:flex; flex-direction:column; gap:0;}
.arch-item{
  display:grid; grid-template-columns:120px 1fr; gap:24px; padding:22px 0; border-top:1px solid var(--border);
}
.arch-item:last-child{border-bottom:1px solid var(--border);}
.arch-key{font-family:var(--font-mono); font-size:12px; color:var(--text-faint); padding-top:2px;}
.arch-val h6{font-size:15px; font-weight:600; margin-bottom:6px;}
.arch-val p{font-size:13.5px; color:var(--text-dim); max-width:640px;}

/* changelog */
.log-item{display:grid; grid-template-columns:100px 1fr; gap:24px; padding:20px 0; border-top:1px solid var(--border);}
.log-item:last-child{border-bottom:1px solid var(--border);}
.log-ver{font-family:var(--font-mono); font-size:13px; color:var(--accent);}
.log-date{font-family:var(--font-mono); font-size:11px; color:var(--text-faint); display:block; margin-top:4px;}
.log-desc p{font-size:14px; color:var(--text-dim); margin-bottom:4px;}
.log-desc ul{margin-left:16px; color:var(--text-dim); font-size:13.5px;}
.log-desc li{margin-bottom:3px;}

/* feedback */
.feedback-box{
  border:1px solid var(--border); border-radius:8px; padding:36px; background:var(--surface);
  display:flex; justify-content:space-between; align-items:center; gap:24px; flex-wrap:wrap;
}
.feedback-box p{color:var(--text-dim); font-size:14px; max-width:420px;}
.feedback-box h4{font-family:var(--font-display); font-size:18px; margin-bottom:8px;}
.feedback-meta{font-family:var(--font-mono); font-size:13px; color:var(--text);}
.feedback-meta span{display:block; color:var(--text-faint); font-size:11px; margin-bottom:4px;}
.feedback-note{margin-top:20px; font-size:13px; color:var(--text-faint); max-width:620px;}

footer{padding:32px 0;}
footer .wrap{display:flex; justify-content:space-between; align-items:center; font-size:12px; color:var(--text-faint); font-family:var(--font-mono); flex-wrap:wrap; gap:12px;}