:root {
  color-scheme: light;
  --surface-1: #fcfcfb;
  --page: #f9f9f7;
  --text-primary: #0b0b0b;
  --text-secondary: #52514e;
  --text-muted: #898781;
  --gridline: #e1e0d9;
  --baseline: #c3c2b7;
  --border: rgba(11, 11, 11, 0.10);

  --series-1: #2a78d6; /* blue */
  --series-2: #008300; /* green */
  --series-3: #e87ba4; /* magenta */
  --series-4: #eda100; /* yellow */

  --good: #0ca30c;
  --warning: #fab219;
  --serious: #ec835a;
  --critical: #d03b3b;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --surface-1: #1a1a19;
    --page: #0d0d0d;
    --text-primary: #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted: #898781;
    --gridline: #2c2c2a;
    --baseline: #383835;
    --border: rgba(255, 255, 255, 0.10);

    --series-1: #3987e5;
    --series-2: #008300;
    --series-3: #d55181;
    --series-4: #c98500;

    --good: #0ca30c;
    --warning: #fab219;
    --serious: #ec835a;
    --critical: #d03b3b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--page);
  color: var(--text-primary);
}

.page {
  max-width: 1080px;
  margin: 0 auto;
  padding: max(24px, env(safe-area-inset-top)) 16px calc(64px + env(safe-area-inset-bottom));
}

header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

h1 {
  font-size: 1.4rem;
  margin: 0;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.updated {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.view-toggle {
  display: flex;
  gap: 6px;
  margin-bottom: 18px;
}

.view-toggle button {
  flex: 1;
  background: var(--surface-1);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: 8px;
  padding: 10px;
  font-size: 0.95rem;
  cursor: pointer;
}

.view-toggle button.active {
  color: var(--text-primary);
  border-color: var(--text-primary);
  font-weight: 600;
}

.hero-status {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px 16px;
  text-align: center;
  margin-bottom: 14px;
}

.hero-badge {
  font-size: 2rem;
  font-weight: 700;
}

.hero-label {
  color: var(--text-secondary);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-top: 4px;
}

.simple-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}

.simple-tile {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 16px;
  text-align: center;
}

.simple-tile .s-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 6px;
}

.simple-tile .s-value {
  font-size: 2.2rem;
  font-variant-numeric: proportional-nums;
}

.simple-tile .s-unit {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-left: 4px;
}

.tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 10px;
  margin-bottom: 28px;
}

.tile {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px;
}

.tile .label {
  color: var(--text-secondary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.tile .value {
  font-size: 1.6rem;
  font-variant-numeric: proportional-nums;
  margin-top: 4px;
}

.tile .unit {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-left: 2px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.72rem;
  margin-top: 6px;
  color: var(--text-secondary);
}

.chip .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

section.chart-section {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 18px 8px;
  margin-bottom: 18px;
}

.chart-section h2 {
  font-size: 0.95rem;
  margin: 0 0 4px;
}

.legend {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.legend .item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.legend .swatch {
  width: 10px;
  height: 2px;
  border-radius: 1px;
  display: inline-block;
}

.range-controls {
  display: flex;
  gap: 6px;
  margin-bottom: 16px;
}

.range-controls button {
  background: var(--surface-1);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-radius: 6px;
  padding: 5px 12px;
  font-size: 0.8rem;
  cursor: pointer;
}

.range-controls button.active {
  color: var(--text-primary);
  border-color: var(--text-primary);
  font-weight: 600;
}

.chart-svg {
  width: 100%;
  height: 220px;
  display: block;
  overflow: visible;
}

.chart-svg .grid line {
  stroke: var(--gridline);
  stroke-width: 1;
}

.chart-svg .axis text {
  fill: var(--text-muted);
  font-size: 10px;
}

.chart-svg .line {
  fill: none;
  stroke-width: 2;
}

.chart-svg .crosshair {
  stroke: var(--baseline);
  stroke-width: 1;
  stroke-dasharray: 3 3;
}

.chart-svg .hover-dot {
  stroke: var(--surface-1);
  stroke-width: 2;
}

.tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 0.75rem;
  color: var(--text-primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  display: none;
  white-space: nowrap;
}

.tooltip .row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.tooltip .row .swatch {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.gas-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.gas-table th, .gas-table td {
  text-align: left;
  padding: 6px 4px;
  border-bottom: 1px solid var(--gridline);
  color: var(--text-secondary);
}

.gas-table td.value {
  color: var(--text-primary);
  font-variant-numeric: proportional-nums;
}

.empty-state {
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 24px 0;
  text-align: center;
}