:root {
  --bg: #0f1420;
  --panel: #161d2e;
  --border: #26324a;
  --text: #dce4f5;
  --muted: #8ea0bf;
  --accent: #4f8cff;
  --green: #3ddc84;
  --amber: #ffc53d;
  --red: #ff5c5c;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
header {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 12px 24px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; font-size: 18px; }
nav { display: flex; gap: 8px; flex: 1; }
button {
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 6px;
  padding: 8px 14px;
  cursor: pointer;
  font-size: 14px;
}
button.ghost { background: transparent; border: 1px solid var(--border); color: var(--text); }
nav button { background: transparent; border: 1px solid transparent; color: var(--muted); }
nav button.active { color: var(--accent); border-color: var(--border); }
main { padding: 24px; max-width: 1200px; margin: 0 auto; }
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}
.center { max-width: 360px; margin: 80px auto; text-align: center; }
label { display: block; margin-bottom: 12px; text-align: left; }
input, select {
  width: 100%;
  padding: 9px 10px;
  margin-top: 6px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #0b101c;
  color: var(--text);
}
table { width: 100%; border-collapse: collapse; margin-top: 12px; }
th, td { padding: 9px 10px; text-align: left; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; }
.badge { padding: 3px 9px; border-radius: 20px; font-size: 12px; }
.badge.on { background: rgba(61,220,132,.15); color: var(--green); }
.badge.off { background: rgba(255,92,92,.15); color: var(--red); }
.badge.pending { background: rgba(255,197,61,.15); color: var(--amber); }
.error { color: var(--red); margin-top: 10px; min-height: 18px; font-size: 13px; }
.muted { color: var(--muted); font-size: 13px; }
.row { display: flex; gap: 12px; align-items: center; margin: 8px 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; margin-top: 16px; }
.modal { position: fixed; inset: 0; background: rgba(0,0,0,.55); display: flex; align-items: flex-start; justify-content: center; padding: 60px 20px; }
.modal-box { width: 100%; max-width: 640px; }
.modal-actions { text-align: right; margin-top: 14px; }
.hidden { display: none !important; }
code, pre { background: #0b101c; padding: 3px 6px; border-radius: 5px; font-size: 13px; }
pre { padding: 12px; overflow-x: auto; }
h2 { margin-top: 0; }
h3 { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: .05em; }
.back { cursor: pointer; color: var(--accent); margin-bottom: 8px; display: inline-block; }
.metric-buttons { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
canvas { margin-top: 16px; width: 100%; max-height: 320px; }