:root {
  --bg: #0f172a;
  --panel: #1e293b;
  --border: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --danger: #f87171;
  --ok: #4ade80;
  font-family: -apple-system, Segoe UI, Roboto, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); }
#topbar { position: sticky; top: 0; z-index: 10; background: var(--bg); }
header { display: flex; align-items: center; justify-content: space-between; padding: 1rem 1.5rem; border-bottom: 1px solid var(--border); }
header h1 { font-size: 1.1rem; margin: 0; }
nav { display: flex; gap: .5rem; padding: 0 1.5rem; border-bottom: 1px solid var(--border); }
nav button { background: none; border: none; color: var(--muted); padding: .75rem 1rem; cursor: pointer; border-bottom: 2px solid transparent; }
nav button.active { color: var(--text); border-bottom-color: var(--accent); }
main { padding: 1.5rem; max-width: 1000px; margin: 0 auto; }
table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
th, td { text-align: left; padding: .5rem .75rem; border-bottom: 1px solid var(--border); font-size: .9rem; }
th { color: var(--muted); font-weight: 600; }
input, button, select { font-size: .9rem; padding: .5rem .7rem; border-radius: 6px; border: 1px solid var(--border); background: var(--panel); color: var(--text); }
button { cursor: pointer; }
button.primary { background: var(--accent); color: #06202e; border: none; font-weight: 600; }
button.danger { color: var(--danger); }
.row { display: flex; gap: .5rem; align-items: center; margin-bottom: 1rem; flex-wrap: wrap; }
.badge { padding: .1rem .5rem; border-radius: 999px; font-size: .75rem; }
.badge.ok { background: rgba(74,222,128,.15); color: var(--ok); }
.badge.off { background: rgba(148,163,184,.15); color: var(--muted); }
.badge.danger { background: rgba(248,113,113,.15); color: var(--danger); }
.center { display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 2rem; width: 320px; }
.card h2 { margin-top: 0; }
.card label { display: block; margin: .75rem 0 .25rem; font-size: .85rem; color: var(--muted); }
.card input { width: 100%; }
.error { color: var(--danger); font-size: .85rem; margin-top: .5rem; }
dialog { background: var(--panel); color: var(--text); border: 1px solid var(--border); border-radius: 10px; padding: 1.5rem; min-width: 280px; }
dialog h3 { margin-top: 0; }
dialog::backdrop { background: rgba(0,0,0,.5); }