:root{
  --bg:#060709;--surface:#0b0d10;--card:#0f1217;--surface-elevated:#151a21;
  --border:#1f252d;--border-strong:#2e3742;
  --text:#eef2f6;--text-secondary:#a3adba;--text-muted:#7c8796;
  --accent:#3db8f5;--accent-bright:#7ad3ff;
  --success:#3dd68c;--warning:#f5b94a;--error:#f2727a;
  --font-sans:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --lab-grid-opacity:.35;--lab-node-size:24px;--lab-line-width:1.5px;
  --radius:6px;--gap:1.25rem;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:400 1rem/1.65 var(--font-sans);overflow-x:hidden;
  background-image:linear-gradient(var(--border) 1px,transparent 1px),linear-gradient(90deg,var(--border) 1px,transparent 1px);
  background-size:48px 48px;background-attachment:fixed}
body::before{content:"";position:fixed;inset:0;background:var(--bg);opacity:calc(1 - var(--lab-grid-opacity));pointer-events:none;z-index:-1}
img,svg{max-width:100%;height:auto}
a{color:var(--accent);text-underline-offset:3px}
a:hover{color:var(--accent-bright)}
:focus-visible{outline:2px solid var(--accent-bright);outline-offset:3px;border-radius:2px}
.skip{position:absolute;left:-999px;top:0;background:var(--accent);color:var(--bg);padding:.5rem 1rem;z-index:10}
.skip:focus{left:0}
.wrap{width:min(100% - 2rem,72rem);margin-inline:auto;padding-block:2.5rem}
.mono{font-family:var(--font-mono)}
.muted{color:var(--text-muted)}
h1{font-size:clamp(2rem,6vw,3.5rem);line-height:1.1;margin:0 0 .75rem;letter-spacing:-.02em}
h2{font-size:clamp(1.25rem,3vw,1.6rem);margin:0 0 1rem}
h3{font-size:1.1rem;margin:.25rem 0 .5rem}
p{margin:0 0 1rem}
.lead{color:var(--text-secondary);font-size:1.1rem;max-width:60ch}

.site-header{position:sticky;top:0;background:var(--surface);border-bottom:1px solid var(--border);z-index:5}
.bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.5rem 1.5rem;padding-block:.75rem}
.brand{font:500 1rem var(--font-mono);color:var(--text);text-decoration:none;letter-spacing:.08em}
.brand span{color:var(--accent)}
nav ul{display:flex;flex-wrap:wrap;gap:.25rem;list-style:none;margin:0;padding:0}
nav a{display:inline-block;padding:.4rem .7rem;color:var(--text-secondary);text-decoration:none;border-radius:var(--radius);min-height:2.25rem}
nav a:hover{color:var(--text);background:var(--surface-elevated)}
nav a[aria-current=page]{color:var(--accent);background:var(--surface-elevated)}
.site-footer{border-top:1px solid var(--border);background:var(--surface);color:var(--text-muted);font-size:.9rem}
.site-footer p{margin:0}
main:focus{outline:none}

.hero{padding-block:5rem 3rem}
.tagline{font:500 clamp(1.1rem,3vw,1.5rem) var(--font-mono);color:var(--accent);margin-bottom:1.5rem}
.btn{display:inline-block;padding:.65rem 1.2rem;border:1px solid var(--border-strong);border-radius:var(--radius);color:var(--text);text-decoration:none;font-weight:500;margin:0 .5rem .5rem 0}
.btn:hover{background:var(--surface-elevated);color:var(--text)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--bg)}
.btn.primary:hover{background:var(--accent-bright);color:var(--bg)}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,18rem),1fr));gap:var(--gap)}
.card{position:relative;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem;min-width:0;overflow-wrap:anywhere}
.card:hover,.card:focus-within{border-color:var(--border-strong)}
.card h3 a{color:var(--text);text-decoration:none}
.card h3 a::after{content:"";position:absolute;inset:0}
.card p{color:var(--text-secondary);font-size:.95rem}
.card-top{display:flex;justify-content:space-between;gap:.5rem;font-size:.8rem;margin-bottom:.5rem}
.tags{display:flex;flex-wrap:wrap;gap:.4rem;list-style:none;margin:0;padding:0}
.tags li{font:400 .78rem var(--font-mono);color:var(--text-secondary);border:1px solid var(--border-strong);border-radius:3px;padding:.1rem .5rem}

.badge{font:500 .72rem var(--font-mono);letter-spacing:.06em;padding:.1rem .5rem;border:1px solid currentColor;border-radius:3px;white-space:nowrap}
.s-success{color:var(--success)}.s-accent{color:var(--accent)}.s-muted{color:var(--text-muted)}.s-warning{color:var(--warning)}

.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(8rem,1fr));gap:var(--gap);margin:0 0 1rem}
.stats div{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1rem}
.stats dd{margin:.5rem 0 0;font-size:2rem}
.stats dt{margin:0}

.detail section{margin-block:2rem;padding-top:1.5rem;border-top:1px solid var(--border)}
.crumb{font-size:.9rem;color:var(--text-muted);margin-bottom:1rem}
.meta{display:grid;grid-template-columns:repeat(auto-fit,minmax(10rem,1fr));gap:1rem;margin:1.5rem 0 0}
.meta dt{font:400 .75rem var(--font-mono);color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em}
.meta dd{margin:.25rem 0 0}
pre{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:1rem;overflow-x:auto;font:400 .9rem/1.5 var(--font-mono)}
figure{margin:0}
figcaption{color:var(--text-muted);font-size:.85rem;margin-top:.5rem}

.pipeline{display:flex;flex-direction:column;gap:.5rem;list-style:none;padding:0;margin:0 0 1.5rem;max-width:26rem}
.pipeline li{background:var(--card);border:1px solid var(--border-strong);border-radius:var(--radius);padding:.6rem 1rem;font-family:var(--font-mono);text-align:center;position:relative}
.pipeline li:not(:last-child)::after{content:"\2193";position:absolute;left:50%;bottom:-1.25rem;transform:translateX(-50%);color:var(--accent);line-height:1}
.pipeline li:not(:last-child){margin-bottom:.75rem}

.topo svg{width:100%;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);display:block}
.topo line{stroke:var(--accent);stroke-width:var(--lab-line-width)}
.topo line.vlan{stroke-dasharray:6 4;stroke:var(--text-secondary)}
.topo .node :is(circle,rect,ellipse){fill:var(--card);stroke:var(--accent);stroke-width:var(--lab-line-width)}
.topo .n-network ellipse{stroke-dasharray:4 3}
.topo text{fill:var(--text);font:500 13px var(--font-mono)}
.topo text.lbl{fill:var(--text-secondary);font-size:11px}
.topo .node{cursor:pointer;outline:none}
.topo .node:hover :is(circle,rect,ellipse),.topo .node:focus-visible :is(circle,rect,ellipse){stroke:var(--accent-bright);fill:var(--surface-elevated)}
.topo .node:focus-visible{outline:2px solid var(--accent-bright);outline-offset:4px}
.topo .link.on line{stroke:var(--accent-bright);stroke-width:3}
.topo details{margin-top:.75rem;color:var(--text-secondary)}
.legend{display:flex;flex-wrap:wrap;gap:.5rem 1.25rem;list-style:none;padding:0;color:var(--text-secondary);font:400 .85rem var(--font-mono)}

@media (max-width:40rem){
  .hero{padding-block:3rem 2rem}
  .site-header{position:static}
  .topo svg{min-height:14rem}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* filters */
.filters{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,11rem),1fr));gap:1rem;align-items:end;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1rem;margin-bottom:1rem}
.field{display:flex;flex-direction:column;gap:.3rem;min-width:0}
.field label{font:400 .75rem var(--font-mono);color:var(--text-secondary);text-transform:uppercase;letter-spacing:.08em}
input,select,button{font:inherit}
input,select{width:100%;background:var(--surface);color:var(--text);border:1px solid var(--border-strong);border-radius:var(--radius);padding:.55rem .7rem;min-height:2.5rem}
button.btn{cursor:pointer}
.actions{display:flex;flex-wrap:wrap;gap:.5rem}
.actions .btn{margin:0}
.empty{background:var(--card);border:1px dashed var(--border-strong);border-radius:var(--radius);padding:1.5rem;color:var(--text-secondary)}
.placeholder{color:var(--text-muted);border:1px dashed var(--border-strong);border-radius:var(--radius);padding:.75rem 1rem;margin:0;text-align:center;font-size:.9rem}
.defs{display:grid;gap:.75rem;margin:0}
.defs div{display:grid;grid-template-columns:minmax(0,11rem) minmax(0,1fr);gap:1rem;align-items:baseline;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:.75rem 1rem}
.defs dt,.defs dd{margin:0}
@media (max-width:40rem){.defs div{grid-template-columns:1fr;gap:.25rem}}

/* ==========================================================================
   Phase 6 addition — append to the end of public/assets/css/lab.css.
   Ecosystem bar (mirrors business.css's .eco block, adapted to lab.css's
   existing --bg/--surface/--border tokens — no new palette introduced)
   plus icon sizing for the shared ecosystemIcon() set.
   ========================================================================== */

.eco { background: var(--bg); border-bottom: 1px solid var(--border); font-size: 0.8125rem; }
.eco-bar { display: flex; align-items: center; gap: 1rem; padding-block: 0.4rem; }
.eco-label { color: var(--text-muted); }
.eco ul { display: flex; gap: 0.25rem; list-style: none; margin: 0; padding: 0; }
.eco a, .eco-off {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius);
  color: var(--text-secondary);
  text-decoration: none;
  font-family: var(--font-mono);
}
.eco a:hover { color: var(--text); background: var(--surface-elevated); }
.eco a[aria-current] { color: var(--accent); background: var(--surface-elevated); }
.eco-off { color: var(--text-muted); cursor: default; }

.eco-ico {
  width: 13px;
  height: 13px;
  margin-right: 0.35rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex: none;
}

.footer-eco { display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; list-style: none; margin: 0.5rem 0 0; padding: 0; }
.footer-eco a { display: inline-flex; align-items: center; color: var(--text-muted); text-decoration: none; }
.footer-eco a:hover { color: var(--accent-bright); }

@media (max-width: 40rem) {
  .eco-label { display: none; }
}