:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1d2228;
  --muted: #6b7480;
  --border: #e1e4e8;
  --grid: #eceef1;
  --accent: #2563eb;
  --ok: #16a34a;
  --warn: #d97706;
  --alarm: #dc2626;
  --series-1: #2563eb;
  --series-2: #db2777;
  --series-3: #059669;
  --series-4: #d97706;
  --series-5: #7c3aed;
  --series-6: #0891b2;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121417;
    --card: #1b1e23;
    --text: #e6e8eb;
    --muted: #8b939e;
    --border: #2b3038;
    --grid: #262a31;
    --accent: #60a5fa;
    --ok: #22c55e;
    --warn: #f59e0b;
    --alarm: #f87171;
    --series-1: #60a5fa;
    --series-2: #f472b6;
    --series-3: #34d399;
    --series-4: #fbbf24;
    --series-5: #a78bfa;
    --series-6: #22d3ee;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main { max-width: 1100px; margin: 0 auto; padding: 16px; }

a { color: var(--accent); text-decoration: none; }

h2 { font-size: 18px; margin: 8px 0 12px; }

code { font-size: 13px; }

.top {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.top .brand { font-weight: 700; color: var(--text); }
.top .logout { margin-left: auto; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

a.device { color: var(--text); display: block; }
a.device:hover { border-color: var(--accent); }

.device-head { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }

.dot { width: 10px; height: 10px; border-radius: 50%; flex: none; }
.dot.on { background: var(--ok); }
.dot.off { background: var(--muted); }

.muted { color: var(--muted); }
.small { font-size: 13px; }

table { border-collapse: collapse; }
table.values { width: 100%; margin-top: 8px; }
table.values td { padding: 2px 0; }
td.num { text-align: right; font-variant-numeric: tabular-nums; padding-right: 6px; }
td.num + td.muted { padding-left: 2px; width: 3.5em; }
td.warn { color: var(--warn); font-weight: 600; }
td.alarm { color: var(--alarm); font-weight: 700; }

.toolbar { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin: 16px 0 12px; }
.ranges { display: flex; gap: 4px; }

button {
  font: inherit;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
  cursor: pointer;
}
button.active { background: var(--accent); border-color: var(--accent); color: #fff; }
button.link { border: none; background: none; padding: 0; color: var(--accent); }

table.summary { width: 100%; max-width: 640px; }
table.summary th { font-weight: 500; color: var(--muted); text-align: right; padding: 4px 6px; }
table.summary td { padding: 4px 0; border-top: 1px solid var(--border); }

#charts { display: flex; flex-direction: column; gap: 12px; }
.chart { overflow: hidden; }
.u-title { font-size: 14px !important; font-weight: 600 !important; color: var(--text); }
.u-legend { color: var(--text); font-size: 13px; }

.login { max-width: 320px; margin: 15vh auto 0; display: flex; flex-direction: column; gap: 12px; }
.login h1 { margin: 0; font-size: 22px; }
.login label { display: flex; flex-direction: column; gap: 4px; color: var(--muted); font-size: 13px; }
.login input {
  font: inherit;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
}
.login button { background: var(--accent); border-color: var(--accent); color: #fff; }
.error { color: var(--alarm); margin: 0; }