:root {
  --bg: #0e1116; --panel: #171c24; --panel2: #1f2630; --line: #2a333f;
  --text: #e6edf3; --dim: #8b98a8; --accent: #4ea1ff; --warn: #ffb84e; --good: #46d18b;
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.4 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}
header {
  display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between;
  padding: 14px 20px; border-bottom: 1px solid var(--line); background: var(--panel);
  position: sticky; top: 0; z-index: 5;
}
h1 { font-size: 18px; margin: 0; font-weight: 600; }
.dim { color: var(--dim); font-weight: 400; }
.controls { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.tabs { display: flex; gap: 6px; }
.tabs button {
  background: var(--panel2); color: var(--dim); border: 1px solid var(--line);
  padding: 6px 12px; border-radius: 8px; cursor: pointer; font-size: 14px;
}
.tabs button.active { color: var(--text); border-color: var(--accent); background: #223146; }
.range select { background: var(--panel2); color: var(--text); border: 1px solid var(--line); border-radius: 8px; padding: 6px 8px; }
.status { color: var(--dim); font-size: 13px; }
.status.err { color: var(--warn); }

main { padding: 20px; max-width: 1200px; margin: 0 auto; }

#tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px; margin-bottom: 26px; }
.tile { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.tile .label { color: var(--dim); font-size: 12px; margin-bottom: 6px; }
.tile .value { font-size: 24px; font-weight: 600; letter-spacing: -0.02em; }
.tile .unit { font-size: 14px; color: var(--dim); font-weight: 400; margin-left: 3px; }
.tile.group-temps .value { color: var(--accent); }
.tile.group-energy .value { color: var(--good); }
.tile.na .value { color: var(--dim); }
.group-head { grid-column: 1 / -1; color: var(--dim); font-size: 12px; text-transform: uppercase; letter-spacing: .08em; margin: 6px 0 -4px; }
.tile .multi { display: flex; flex-direction: column; gap: 3px; margin-top: 2px; }
.tile .pumpval { font-size: 19px; font-weight: 600; letter-spacing: -0.02em; }
.tile .pumpval em { font-style: normal; color: var(--dim); font-size: 11px; font-weight: 500; margin-right: 7px; display: inline-block; min-width: 30px; }
.tile .multi .unit { font-size: 12px; color: var(--dim); font-weight: 400; margin-left: 2px; }

.tile.alarm { border-color: var(--warn); background: #2a2113; }
.tile.alarm .value { color: var(--warn); }

#charts { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 16px; }
.chart-card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; }
.chart-card h3 { margin: 0 0 10px; font-size: 14px; font-weight: 600; color: var(--dim); }
canvas { width: 100% !important; height: 240px !important; }

/* --- Mobile --- */
@media (max-width: 640px) {
  header { padding: 10px 14px; gap: 8px; position: static; }
  h1 { font-size: 16px; width: 100%; }
  .controls { width: 100%; justify-content: space-between; gap: 8px; }
  /* Tabs scroll horizontally instead of wrapping */
  .tabs { overflow-x: auto; -webkit-overflow-scrolling: touch; max-width: 60vw; }
  .tabs button { white-space: nowrap; padding: 6px 10px; }
  main { padding: 12px; }
  #tiles { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 8px; }
  .tile { padding: 10px 12px; }
  .tile .value { font-size: 21px; }
  #charts { grid-template-columns: 1fr; gap: 12px; }
  .chart-card { padding: 10px 10px 6px; }
  canvas { height: 200px !important; }
}