:root {
  color-scheme: light;
  --surface-1: #fcfcfb;
  --page-plane: #f9f9f7;
  --text-primary: #0b0b0b;
  --text-secondary: #52514e;
  --text-muted: #898781;
  --gridline: #e1e0d9;
  --baseline: #c3c2b7;
  --border: rgba(11, 11, 11, 0.10);
  --series-flow: #1a8fd1;
  --series-liters: #0f9d8c;
  --series-peak: #eb6834;
  --good: #0ca30c;
  --warning: #fab219;
  --critical: #d03b3b;
}

@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --surface-1: #1a1a19;
    --page-plane: #0d0d0d;
    --text-primary: #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted: #898781;
    --gridline: #2c2c2a;
    --baseline: #383835;
    --border: rgba(255, 255, 255, 0.10);
    --series-flow: #3ba3e5;
    --series-liters: #1fbfa8;
    --series-peak: #d95926;
    --good: #0ca30c;
    --warning: #fab219;
    --critical: #e66767;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --surface-1: #1a1a19;
  --page-plane: #0d0d0d;
  --text-primary: #ffffff;
  --text-secondary: #c3c2b7;
  --text-muted: #898781;
  --gridline: #2c2c2a;
  --baseline: #383835;
  --border: rgba(255, 255, 255, 0.10);
  --series-flow: #3ba3e5;
  --series-liters: #1fbfa8;
  --series-peak: #d95926;
  --good: #0ca30c;
  --warning: #fab219;
  --critical: #e66767;
}

* { box-sizing: border-box; }

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

.page {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.page-header h1 { margin: 0 0 4px; font-size: 24px; font-weight: 650; }
.subtitle { margin: 0; color: var(--text-secondary); font-size: 14px; }
.back-link { font-size: 13px; color: var(--text-secondary); }
.back-link a { color: inherit; }

.status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  padding-top: 4px;
}
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--text-muted); flex-shrink: 0; }
.status-dot.live { background: var(--good); }
.status-dot.stale { background: var(--warning); }

.stat-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}
@media (max-width: 720px) { .stat-row { grid-template-columns: 1fr 1fr; } }

.stat-tile { background: var(--surface-1); border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px; }
.stat-label { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-secondary); margin-bottom: 6px; }
.key-dot { width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0; }
.key-flow { background: var(--series-flow); }
.key-liters { background: var(--series-liters); }
.key-peak { background: var(--series-peak); }

.stat-value { font-size: 40px; font-weight: 650; line-height: 1.1; }
.stat-sub { margin-top: 6px; font-size: 13px; color: var(--text-muted); }

.filter-row { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.range-btn { font: inherit; font-size: 13px; color: var(--text-secondary); background: var(--surface-1); border: 1px solid var(--border); border-radius: 8px; padding: 6px 12px; cursor: pointer; }
.range-btn:hover { color: var(--text-primary); }
.range-btn.active { color: var(--text-primary); border-color: var(--series-flow); font-weight: 600; }

.chart-card { background: var(--surface-1); border: 1px solid var(--border); border-radius: 12px; padding: 16px 18px 8px; margin-bottom: 16px; }
.chart-card-header { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; margin-bottom: 4px; }
.chart-card-header h2 { margin: 0; font-size: 15px; font-weight: 600; }
.chart-range-stats { font-size: 12px; color: var(--text-muted); font-variant-numeric: tabular-nums; }

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

.gridline { stroke: var(--gridline); stroke-width: 1; }
.baseline { stroke: var(--baseline); stroke-width: 1; }
.tick-label { fill: var(--text-muted); font-size: 11px; }
.area-fill { fill-opacity: 0.12; }
.crosshair-line { stroke: var(--text-muted); stroke-width: 1; }

.chart-empty { display: flex; align-items: center; justify-content: center; height: 100%; color: var(--text-muted); font-size: 13px; }

.tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 12px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
  opacity: 0;
  transform: translate(-50%, -100%);
  white-space: nowrap;
  z-index: 5;
}
.tooltip.visible { opacity: 1; }
.tooltip-time { color: var(--text-muted); margin-bottom: 4px; }
.tooltip-row { display: flex; align-items: center; gap: 6px; }
.tooltip-value { font-weight: 650; color: var(--text-primary); }
.tooltip-key { width: 10px; height: 2px; border-radius: 1px; }
.tooltip-key.bar { height: 10px; border-radius: 2px; }

.page-footer { text-align: center; color: var(--text-muted); font-size: 12px; margin-top: 24px; }

@media (max-width: 520px) {
  .stat-row { grid-template-columns: 1fr; }
  .stat-value { font-size: 32px; }
}