/* Restored layout + dark sleek theme */
:root{
  --bg:#0b0f14;
  --panel:#0f141b;
  --card:#101820;
  --text:#e6edf3;
  --muted:#94a3b8;
  --border:#1f2a37;
  --accent:#60a5fa;
  --shadow: 0 10px 24px rgba(0,0,0,.35);
}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui;color:var(--text);background:var(--bg)}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.site-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;border-bottom:1px solid var(--border);background:var(--panel)}
.logo h1{margin:0;font-size:1.4rem}
.logo p{margin:0;font-size:.9rem;color:var(--muted)}
.nav a{margin-left:14px;padding:6px 12px;border:1px solid var(--border);border-radius:8px}
.container{max-width:1200px;margin:0 auto;padding:20px}
.tab{display:none}
.tab.visible{display:block}
.card{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:20px;margin-bottom:20px;box-shadow:var(--shadow)}
.card h2{margin-top:0}
.card.clickable{cursor:pointer;transition:background .2s}
.card.clickable:hover{background:#18212c}
.lab-grid{display:grid;grid-template-columns:3fr 1fr;gap:16px}
.topology{background:var(--card);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);overflow:hidden}
.topology-toolbar{display:flex;align-items:center;gap:6px;padding:6px;background:var(--panel);border-bottom:1px solid var(--border)}
.topology-toolbar button{padding:2px 8px;border:1px solid var(--border);background:var(--card);color:var(--text);cursor:pointer;border-radius:6px}
.topology-toolbar span{font-size:.8rem;color:var(--muted);margin-left:auto}
.topology-stage{height:700px;width:100%;overflow:hidden;position:relative;cursor:grab;background:#0b0f14}
.topology-stage.grabbing{cursor:grabbing}
.details{background:var(--card);border:1px solid var(--border);border-radius:16px;padding:14px;height:700px;overflow:auto;width:400px;}
.details-empty{color:var(--muted);padding-top:20px}
.device-title{font-weight:600;font-size:1.2rem}
.device-meta{font-size:.9rem;margin-bottom:10px;color:var(--muted)}
.link{stroke:#3b82f6;stroke-width:2}
.node image{width:72px;height:72px;rx:12;ry:12}
.node circle{fill:#0b1520;stroke:#2a3a4a;stroke-width:2}
.node text{font-size:20px;fill:#cbd5e1}
.site-footer{text-align:center;padding:16px;border-top:1px solid var(--border);margin-top:40px;font-size:.85rem;color:var(--muted)}

.card-link {
  display: block;
  color: var(--text);
  text-decoration: none;
}

/*.card-link:hover {
  text-decoration: underline;
}