:root {
  --bg: #f1f5f9;
  --card-bg: #ffffff;
  --surface: #f8fafc;
  --text: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --primary: #2563eb;
  --primary-light: #dbeafe;
  --voi: #ea580c;
  --dott: #2563eb;
  --green: #16a34a;
  --yellow: #ca8a04;
  --red: #dc2626;
  --border: #e2e8f0;
  --shadow: 0 1px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.10);
  --radius: 12px;
  --radius-sm: 8px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding: 0 max(12px, calc((100vw - 1200px) / 2));
}

/* Header */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0 12px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 8px;
}
.header-left h1 { font-size: 1.25rem; font-weight: 700; color: var(--text); }
.header-subtitle { font-size: 0.8rem; color: var(--text-muted); margin-left: 10px; }
.header-center { display: flex; gap: 20px; align-items: center; }
.toggle-label { display: flex; align-items: center; gap: 6px; cursor: pointer; font-size: 0.85rem; font-weight: 500; color: var(--text-secondary); }
.toggle-label input { accent-color: var(--primary); width: 15px; height: 15px; cursor: pointer; }
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.voi-dot { background: var(--voi); }
.dott-dot { background: var(--dott); }
.last-updated { font-size: 0.78rem; color: var(--text-muted); }

/* KPI Row */
#kpi-row {
  display: flex; gap: 8px; padding: 14px 0 0;
  flex-wrap: wrap;
}
.kpi-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  min-width: 110px;
  flex: 1;
  box-shadow: var(--shadow);
}
.kpi-value { font-size: 1.6rem; font-weight: 700; line-height: 1.2; }
.kpi-label { font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.4px; margin-top: 2px; }
.kpi-voi .kpi-value { color: var(--voi); }
.kpi-dott .kpi-value { color: var(--dott); }
.kpi-warn .kpi-value { color: var(--yellow); }

/* Tab bar */
.tab-bar {
  display: flex; gap: 4px; margin: 16px 0;
  padding: 4px;
  background: var(--border);
  border-radius: 10px;
  width: fit-content;
}
.tab {
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}
.tab:hover { background: rgba(255,255,255,0.6); color: var(--text); }
.tab.active {
  background: var(--card-bg);
  color: var(--primary);
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}

/* Map container */
#map-container {
  position: relative;
  height: min(64vh, 680px);
  min-height: 420px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  background: #ffffff;
}
#map { width: 100%; height: 100%; }
.leaflet-container { background: #f8fafc; }
.leaflet-pane { z-index: 1; }

/* Map panels */
.map-panel {
  position: absolute;
  top: 16px;
  right: 16px;
  width: min(340px, calc(100% - 32px));
  max-height: calc(100% - 32px);
  overflow-y: auto;
  z-index: 500;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 16px;
}
.map-panel[hidden] { display: none; }

/* Chart panel */
.chart-panel {
  margin: 20px 0 24px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.chart-panel[hidden] { display: none; }

/* Panel status */
.panel-status {
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  margin-bottom: 10px;
}
.panel-status--loading { background: var(--primary-light); color: var(--primary); }
.panel-status--error { background: #fef2f2; color: var(--red); }
.panel-status--empty { background: var(--surface); color: var(--text-muted); }

/* Control group */
.control-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 10px; }
.control-group label { font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.3px; }
.control-group select, .control-group button {
  padding: 7px 10px;
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.82rem;
  cursor: pointer;
  transition: border-color 0.15s;
}
.control-group select:hover { border-color: var(--primary); }
.control-group button {
  background: var(--primary);
  color: #fff;
  font-weight: 600;
  border: none;
}
.control-group button:hover { background: #1d4ed8; }

/* Hotspot legend */
.legend { margin-top: 8px; }
.legend-title { font-size: 0.7rem; color: var(--text-muted); margin-bottom: 4px; }
.legend-gradient {
  height: 6px;
  background: linear-gradient(to right, #dbeafe, #fde68a, #fca5a5, #ef4444);
  border-radius: 3px;
}
.legend-labels { display: flex; justify-content: space-between; font-size: 0.65rem; color: var(--text-muted); margin-top: 2px; }

/* Zone list */
.zone-list { margin-top: 8px; }
.zone-list-header {
  display: flex; justify-content: space-between;
  font-size: 0.65rem; color: var(--text-muted); text-transform: uppercase;
  padding: 4px 0; border-bottom: 1px solid var(--border); margin-bottom: 4px;
}
.zone-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 4px 0; font-size: 0.8rem; border-bottom: 1px solid #f1f5f9;
}
.zone-item .zone-name { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.zone-item .zone-count { font-weight: 600; margin-left: 8px; }
.zone-item .zone-type { font-size: 0.6rem; color: var(--text-muted); margin-left: 6px; }
.zone-summary { border-top: 1px solid var(--border); margin-top: 6px; padding-top: 6px; font-size: 0.78rem; }
.zone-summary .stat-row { display: flex; justify-content: space-between; padding: 2px 0; }

/* Quality grid */
.quality-grid { display: flex; flex-direction: column; gap: 8px; font-size: 0.8rem; }
.quality-card {
  padding: 10px 12px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.quality-card h4 { font-size: 0.85rem; margin-bottom: 6px; }
.quality-card .stat-row { display: flex; justify-content: space-between; padding: 3px 0; }
.quality-card .stat-label { color: var(--text-muted); }
.quality-card .stat-value { font-weight: 600; }
.ok { color: var(--green); }
.warn { color: var(--yellow); }
.err { color: var(--red); }

/* Chart */
#chart-container h3 { font-size: 1rem; font-weight: 700; }
.chart-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 12px; flex-wrap: wrap; gap: 8px;
}
.chart-controls { display: flex; gap: 8px; }
.chart-controls select {
  padding: 5px 10px;
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
}
.chart-controls select:hover { border-color: var(--primary); }
#timeseries-chart { max-height: 280px; }
.chart-footer {
  display: flex; justify-content: space-between;
  font-size: 0.7rem; color: var(--text-muted); margin-top: 10px;
  flex-wrap: wrap; gap: 4px;
}
.chart-footer a { color: var(--primary); text-decoration: none; }
.chart-footer a:hover { text-decoration: underline; }

/* Leaflet popup */
.leaflet-popup-content-wrapper { border-radius: var(--radius-sm); box-shadow: var(--shadow-lg); }
.leaflet-popup-content { font-size: 0.82rem; margin: 10px 14px; }

/* Responsive */
@media (max-width: 768px) {
  body { padding: 0 8px; }
  header { flex-direction: column; align-items: flex-start; }
  #kpi-row { gap: 4px; }
  .kpi-card { padding: 10px 14px; min-width: 60px; }
  .kpi-value { font-size: 1.3rem; }
.tab-bar { width: 100%; overflow-x: auto; }
.tab { flex-shrink: 0; }
@media (max-width: 768px) {
  .tab-bar { overflow-x: visible; display: grid; grid-template-columns: 1fr 1fr; gap: 4px; }
  .tab { flex-shrink: 1; text-align: center; padding: 10px 8px; font-size: 0.8rem; }
}
  #map-container { height: 380px; min-height: 300px; }
  .map-panel {
    position: static;
    width: 100%;
    max-height: none;
    margin: 8px 0 0;
    box-shadow: var(--shadow);
  }
  .map-panel[hidden] { display: none; }
  #chart-container { padding: 14px; }
}