/**
 * Frequency Dashboard - Premium Styles
 * Design System compliant: tokens.css + premium patterns
 */

/* ========================================
   DASHBOARD LAYOUT
   ======================================== */

.frequency-dashboard {
  padding: 24px;
  max-width: 1600px;
  margin: 0 auto;
  animation: fadeIn 0.4s ease-in-out;
}

/* Header Premium */
.frequency-dashboard .module-header-premium {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
  padding: 24px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 12px;
  color: white;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.25);
}

.frequency-dashboard .header-content h1 {
  margin: 0 0 8px 0;
  font-size: 28px;
  font-weight: 700;
}

.frequency-dashboard .breadcrumb {
  font-size: 14px;
  opacity: 0.9;
}

.frequency-dashboard .breadcrumb a {
  color: white;
  text-decoration: none;
  transition: opacity 0.2s;
}

.frequency-dashboard .breadcrumb a:hover {
  opacity: 0.7;
  text-decoration: underline;
}

.frequency-dashboard .header-actions {
  display: flex;
  gap: 12px;
}

/* ========================================
   STATS CARDS GRID
   ======================================== */

.dashboard-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

/* Stat Card Enhanced */
.stat-card-enhanced {
  position: relative;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 28px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: all 0.3s ease;
  overflow: hidden;
}

.stat-card-enhanced::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary, linear-gradient(135deg, #667eea 0%, #764ba2 100%));
  transition: height 0.3s ease;
}

.stat-card-enhanced:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(102, 126, 234, 0.2);
}

.stat-card-enhanced:hover::before {
  height: 6px;
}

/* Card Icons */
.stat-card-enhanced .card-icon {
  font-size: 48px;
  line-height: 1;
  opacity: 0.9;
}

/* Card Content */
.stat-card-enhanced .card-content {
  flex: 1;
}

.stat-card-enhanced h3 {
  margin: 0 0 8px 0;
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #64748b;
}

.stat-card-enhanced .card-value {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.2;
  color: #1e293b;
  margin-bottom: 4px;
}

.stat-card-enhanced .card-subtitle {
  font-size: 13px;
  color: #64748b;
}

/* Card Trends */
.stat-card-enhanced .card-trend {
  font-size: 13px;
  font-weight: 600;
  margin-top: 8px;
}

.trend-up {
  color: #10b981;
}

.trend-down {
  color: #ef4444;
}

.trend-neutral {
  color: #64748b;
}

/* Card Color Variants */
.stat-card-enhanced.card-primary::before {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.stat-card-enhanced.card-success::before {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.stat-card-enhanced.card-info::before {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
}

.stat-card-enhanced.card-warning::before {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
}

/* Loading State */
.stat-card-enhanced.loading {
  opacity: 0.6;
  pointer-events: none;
}

.loading-skeleton {
  display: inline-block;
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 4px;
  min-width: 60px;
  height: 1em;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Button Link (in cards) */
.btn-link {
  background: none;
  border: none;
  color: #667eea;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  padding: 8px 0;
  margin-top: 8px;
  transition: color 0.2s;
}

.btn-link:hover {
  color: #764ba2;
  text-decoration: underline;
}

/* ========================================
   CHARTS SECTION
   ======================================== */

.dashboard-charts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 28px;
  margin-bottom: 32px;
}

.chart-container {
  background: white;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: box-shadow 0.3s ease;
}

.chart-container:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.chart-header {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 2px solid #f1f5f9;
}

.chart-header h3 {
  margin: 0 0 4px 0;
  font-size: 18px;
  font-weight: 700;
  color: #1e293b;
}

.chart-subtitle {
  font-size: 13px;
  color: #64748b;
  font-weight: 500;
}

.chart-canvas-wrapper {
  position: relative;
  height: 300px;
}

.chart-canvas-wrapper canvas {
  max-height: 100%;
}

/* ========================================
   POLLING STATUS
   ======================================== */

.polling-status {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: #f8fafc;
  border-radius: 8px;
  font-size: 13px;
  color: #64748b;
  margin-top: 24px;
}

.polling-status #pollingIndicator {
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.polling-status .status-active {
  color: #10b981;
}

.polling-status .status-paused {
  color: #f59e0b;
}

.polling-status #lastUpdate {
  font-size: 12px;
  opacity: 0.8;
}

/* ========================================
   ERROR STATE
   ======================================== */

.error-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 24px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.error-state .error-icon {
  font-size: 64px;
  margin-bottom: 16px;
  opacity: 0.8;
}

.error-state h3 {
  font-size: 24px;
  font-weight: 700;
  color: #ef4444;
  margin: 0 0 12px 0;
}

.error-state p {
  font-size: 16px;
  color: #64748b;
  margin: 0 0 24px 0;
}

/* ========================================
   BUTTONS
   ======================================== */

.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
  background: white;
  color: #667eea;
  border: 2px solid #667eea;
}

.btn-secondary:hover {
  background: #667eea;
  color: white;
}

/* ========================================
   ANIMATIONS
   ======================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    max-height: 0;
  }
  to {
    opacity: 1;
    max-height: 500px;
  }
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

/* Tablet (1024px) */
@media (max-width: 1024px) {
  .frequency-dashboard .module-header-premium {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .dashboard-stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .dashboard-charts {
    grid-template-columns: 1fr;
  }

  .chart-canvas-wrapper {
    height: 250px;
  }
}

/* Mobile (768px) */
@media (max-width: 768px) {
  .frequency-dashboard {
    padding: 16px;
  }

  .frequency-dashboard .module-header-premium {
    padding: 20px;
  }

  .frequency-dashboard .header-content h1 {
    font-size: 22px;
  }

  .dashboard-stats-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .stat-card-enhanced {
    padding: 20px;
  }

  .stat-card-enhanced .card-icon {
    font-size: 36px;
  }

  .stat-card-enhanced .card-value {
    font-size: 28px;
  }

  .dashboard-charts {
    gap: 16px;
  }

  .chart-container {
    padding: 20px;
  }

  .chart-canvas-wrapper {
    height: 220px;
  }

  .polling-status {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .frequency-dashboard .header-actions {
    width: 100%;
    flex-direction: column;
  }

  .frequency-dashboard .header-actions .btn {
    width: 100%;
    justify-content: center;
  }
}

/* Mobile Small (480px) */
@media (max-width: 480px) {
  .stat-card-enhanced {
    flex-direction: column;
    text-align: center;
  }

  .chart-header h3 {
    font-size: 16px;
  }
}