:root {
  --bg-dark: #f8fafc; /* Main light background */
  --card-bg: #ffffff; /* Card background */
  --border-color: #e2e8f0; /* Subtle grey border */
  --text-main: #0f172a; /* Dark text for high contrast */
  --text-secondary: #64748b; /* Muted secondary text */
  --accent-emerald: #10b981;
  --accent-amber: #d97706; /* Slightly darker amber for light mode contrast */
  --accent-blue: #2563eb;
  --accent-red: #ef4444;
}

body {
  margin: 0;
  padding: 24px;
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 24px;
}

h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 700;
}

.top-menu {
  display: flex;
  gap: 8px;
  background-color: var(--card-bg);
  padding: 6px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.menu-btn {
  background: transparent;
  color: var(--text-secondary);
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  text-decoration: none;
  transition: all 0.2s ease;
  display: inline-block;
}

.menu-btn.active, .menu-btn:hover {
  background-color: var(--accent-blue);
  color: #ffffff;
}

.client-selector {
  display: flex;
  align-items: center;
  gap: 12px;
  background-color: var(--card-bg);
  padding: 8px 16px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

select {
  background-color: var(--bg-dark);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.card {
  background-color: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.card h3 {
  margin: 0 0 8px 0;
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  letter-spacing: 0.05em;
}

.card .value {
  font-size: 1.5rem;
  font-weight: 700;
}

.unit {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-left: 4px;
}

.charts-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}

@media (max-width: 1024px) {
  .charts-grid { grid-template-columns: 1fr; }
}

.telemetry-feed {
  max-height: 400px;
  overflow-y: auto;
}

.telemetry-item {
  padding: 10px 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.85rem;
}

.telemetry-item:last-child { border-bottom: none; }
.telemetry-time { color: var(--text-secondary); font-family: monospace; margin-right: 8px; }

/* Custom light styles for All Sites summary cards inline inside HTML */
.summary-card {
  background: #f1f5f9 !important;
  border: 1px solid #e2e8f0 !important;
}
.summary-card h4 {
  color: #64748b !important;
}