:root {
  color-scheme: dark;
  --bg: #0f172a;
  --panel: #1b2336;
  --panel-2: #111827;
  --text: #f8fafc;
  --muted: #94a3b8;
  --border: #475569;
  --green: #22c55e;
  --blue: #38bdf8;
  --violet: #c084fc;
  --amber: #fbbf24;
  --red: #ef4444;
}

* { box-sizing: border-box; }

html { font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top left, rgba(34, 197, 94, .14), transparent 32rem), var(--bg);
  color: var(--text);
}

.shell {
  width: min(1180px, 100%);
  margin: 0 auto;
  padding: 20px 14px 34px;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.eyebrow {
  margin: 0 0 5px;
  color: var(--green);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

h1, h2 { margin: 0; letter-spacing: 0; }
h1 { font-size: clamp(1.55rem, 4vw, 2.35rem); line-height: 1.1; }
h2 { font-size: 1rem; }
.muted { margin: 8px 0 0; color: var(--muted); line-height: 1.5; }

.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(27, 35, 54, .9);
  color: var(--muted);
  font-weight: 750;
  white-space: nowrap;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 4px rgba(251, 191, 36, .14);
}

.status.live { color: var(--text); }
.status.live .dot { background: var(--green); box-shadow: 0 0 0 4px rgba(34, 197, 94, .16); }
.status.stale .dot { background: var(--red); box-shadow: 0 0 0 4px rgba(239, 68, 68, .16); }

.metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 10px;
}

.metric, .panel {
  border: 1px solid rgba(148, 163, 184, .26);
  border-radius: 8px;
  background: rgba(27, 35, 54, .92);
  box-shadow: 0 18px 42px rgba(0, 0, 0, .18);
}

.metric {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  min-height: 122px;
  padding: 15px;
}

.metric span {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.metric strong {
  font: 750 clamp(2.1rem, 6vw, 4rem) / 1 ui-monospace, "Cascadia Code", monospace;
}

.metric small { color: var(--muted); padding-bottom: 8px; }
.metric.main { border-color: rgba(192, 132, 252, .6); }

.panel { padding: 15px; margin-bottom: 10px; }
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 10px; }

.chart-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 9px;
  flex-wrap: wrap;
}

.compare-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 7px 10px;
  border: 1px solid rgba(34, 197, 94, .42);
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(34, 197, 94, .18), rgba(15, 23, 42, .64));
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .03);
  color: var(--text);
  white-space: nowrap;
}

.compare-chip[hidden] { display: none; }
.compare-chip span {
  color: #bbf7d0;
  font-size: .72rem;
  font-weight: 850;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.compare-chip strong {
  font-size: .82rem;
  font-weight: 850;
}
.compare-chip b {
  font: 850 .94rem / 1 ui-monospace, "Cascadia Code", monospace;
  color: white;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(15, 23, 42, .48);
  color: var(--text);
  font-weight: 750;
  cursor: pointer;
}

.toggle input {
  width: 18px;
  height: 18px;
  accent-color: var(--green);
}

button {
  min-height: 44px;
  padding: 8px 13px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #334155;
  color: var(--text);
  font: inherit;
  font-weight: 750;
  cursor: pointer;
  transition: background .18s, border-color .18s, transform .18s;
}

button:hover { background: #3f4d63; border-color: #64748b; }
button:focus-visible { outline: 3px solid white; outline-offset: 3px; }
button:active { transform: translateY(1px); }

.chart-wrap { height: 300px; }
canvas { display: block; width: 100%; height: 100%; }

.compare {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 120px)) 1fr;
  gap: 10px;
  align-items: center;
  margin: 0 0 10px;
  padding: 10px;
  border: 1px solid rgba(34, 197, 94, .32);
  border-radius: 8px;
  background: rgba(15, 23, 42, .46);
}

.compare[hidden] { display: none; }
.compare div { display: grid; gap: 2px; }
.compare span { color: var(--muted); font-size: .74rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.compare strong { font: 760 1.45rem / 1 ui-monospace, "Cascadia Code", monospace; }
.compare small { color: var(--muted); }
.compare p { margin: 0; color: var(--muted); line-height: 1.45; }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  margin-top: 10px;
  color: var(--muted);
  font-size: .84rem;
}

.legend span { display: inline-flex; align-items: center; gap: 7px; }
.line { width: 22px; height: 3px; border-radius: 2px; display: inline-block; }
.line.pm1 { background: var(--blue); }
.line.pm25 { background: var(--violet); }
.line.pm10 { background: var(--amber); }
.line.gaw25 { background: repeating-linear-gradient(90deg, #fb7185 0 8px, transparent 8px 13px); }
.line.gaw10 { background: repeating-linear-gradient(90deg, #22c55e 0 8px, transparent 8px 13px); }

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.detail { margin: 8px 0 0; display: grid; gap: 7px; }
.detail div { display: grid; grid-template-columns: minmax(88px, .5fr) 1fr; gap: 12px; align-items: baseline; }
.detail dt { color: var(--muted); }
.detail dd { margin: 0; font-weight: 750; overflow-wrap: anywhere; }

.calibration-panel {
  border-color: rgba(56, 189, 248, .26);
}

.calibration-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 9px;
  flex-wrap: wrap;
}

.calibration-summary {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.calibration-summary article {
  display: grid;
  gap: 4px;
  min-height: 104px;
  padding: 12px;
  border: 1px solid rgba(148, 163, 184, .22);
  border-radius: 8px;
  background: rgba(15, 23, 42, .42);
}

.calibration-summary span {
  color: var(--muted);
  font-size: .72rem;
  font-weight: 850;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.calibration-summary strong {
  font: 800 1.35rem / 1.1 ui-monospace, "Cascadia Code", monospace;
}

.calibration-summary small,
.calibration-help {
  color: var(--muted);
  line-height: 1.45;
}

.calibration-help {
  margin: 12px 0 0;
}

button:disabled {
  cursor: not-allowed;
  opacity: .55;
}

@media (max-width: 760px) {
  .topbar, .grid { display: block; }
  .panel-head { align-items: flex-start; flex-direction: column; }
  .chart-actions { width: 100%; justify-content: space-between; }
  .calibration-actions { width: 100%; }
  .calibration-actions button { flex: 1; }
  .compare-chip {
    width: 100%;
    justify-content: space-between;
    order: 3;
    overflow-x: auto;
  }
  .toggle { flex: 1; }
  .status { margin-top: 14px; }
  .metrics { grid-template-columns: 1fr; }
  .metric { min-height: 106px; }
  .chart-wrap { height: 240px; }
  .compare { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .compare p { grid-column: 1 / -1; }
  .calibration-summary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 520px) {
  .calibration-summary { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}