:root {
  --bg: #10151b;
  --surface: #1a212b;
  --surface-raised: #202834;
  --border: #333e4c;
  --border-strong: #465364;
  --text: #f7f9fb;
  --text-dim: #c3ccd6;
  --text-faint: #94a0ad;
  --accent: #5fe3d6;
  --rise: #ffb84d;
  --fall: #6fabff;
  --storm: #ff6b5e;
  --mono: ui-monospace, 'SFMono-Regular', 'JetBrains Mono', Consolas, monospace;
  --sans: -apple-system, 'Segoe UI', Inter, system-ui, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  min-height: 100vh;
}

.topbar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 20px 28px;
  border-bottom: 1px solid var(--border);
}

.brand-mark {
  font-family: var(--mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent);
}

.brand-sub {
  margin-left: 10px;
  font-size: 13px;
  color: var(--text-dim);
}

.clock {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px;
}

.tile-group {
  margin-bottom: 22px;
}

.tile-group-label {
  font-size: 13px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 10px;
  font-weight: 600;
}

.tiles {
  display: grid;
  grid-template-columns: repeat(var(--cols, 3), 1fr);
  gap: 14px;
}

@media (max-width: 640px) {
  .tiles { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 420px) {
  .tiles { grid-template-columns: 1fr; }
}

.tile {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.15s ease;
  text-align: left;
}

.tile:hover {
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

.tile.active {
  border-color: var(--accent);
}

.tile-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.tile-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.tile-loc {
  font-size: 13px;
  color: var(--text-dim);
  margin-top: 2px;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-faint);
  flex-shrink: 0;
}

.dot.online { background: var(--accent); }
.dot.offline { background: var(--storm); }

.tile-readings {
  display: flex;
  gap: 18px;
  font-family: var(--mono);
}

.reading .value {
  font-size: 28px;
  font-weight: 600;
}

.reading.temp .value { color: var(--accent); }
.reading.press .value { color: var(--rise); }

.reading .unit {
  font-size: 13px;
  color: var(--text-dim);
  margin-left: 2px;
}

.reading .label {
  font-size: 12px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.mini-trend {
  font-size: 14px;
  margin-left: 6px;
  vertical-align: middle;
}

.trend-row {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 6px;
}

.trend-row .sep { color: var(--text-faint); }

.tile-substat {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 6px;
}

.trend-arrow { font-family: var(--mono); font-weight: 700; }
.trend-arrow.rise { color: var(--rise); }
.trend-arrow.fall { color: var(--fall); }
.trend-arrow.storm { color: var(--storm); }
.trend-arrow.stable { color: var(--text-dim); }

.tile-stale {
  font-size: 13px;
  color: var(--text-dim);
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.panel-head h2 {
  font-size: 16px;
  font-weight: 600;
  margin: 0;
  color: var(--text);
}

.range-switch button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 12px;
  padding: 6px 12px;
  cursor: pointer;
  font-family: var(--sans);
}

.range-switch button:first-child { border-radius: 6px 0 0 6px; }
.range-switch button:last-child { border-radius: 0 6px 6px 0; }
.range-switch button + button { border-left: none; }

.range-switch button.active {
  background: var(--surface-raised);
  color: var(--accent);
  border-color: var(--border-strong);
}

.chart-wrap {
  position: relative;
  height: 320px;
}

.panel-empty {
  text-align: center;
  color: var(--text-faint);
  font-size: 13px;
  padding: 40px 0;
}

.chart-wrap.hidden, .panel-empty.hidden { display: none; }

@media (max-width: 640px) {
  main { padding: 18px; }
  .topbar { padding: 16px 18px; }
}