/* CSS Reset and Variables */
:root {
  /* Color Palette - Professional Dashboard Theme */
  --primary-color: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary-color: #64748b;
  --accent-color: #f59e0b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  
  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-dark: #1e293b;
  --bg-sidebar: #334155;
  
  /* Text Colors */
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --text-white: #ffffff;
  
  /* Border and Shadow */
  --border-color: #e2e8f0;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

/* Dark Theme Variables */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border-color: #475569;
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  overflow-x: hidden;
}

/* Dashboard Container */
.dashboard-container {
  display: flex;
  min-height: 100vh;
  background-color: var(--bg-secondary);
}

/* Sidebar Styles */
.sidebar {
  width: 280px;
  background: linear-gradient(180deg, var(--bg-sidebar) 0%, #475569 100%);
  color: var(--text-white);
  padding: var(--spacing-xl) 0;
  box-shadow: var(--shadow-lg);
  position: fixed;
  height: 100vh;
  overflow-y: auto;
  z-index: 1000;
}

.sidebar-header {
  padding: 0 var(--spacing-xl) var(--spacing-xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: var(--spacing-xl);
}

.user-profile {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.avatar {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
}

.avatar-icon {
  width: 28px;
  height: 28px;
  color: white;
}

.user-info h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: 4px;
  letter-spacing: 0.5px;
}

.user-info p {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
}

.sidebar-nav ul {
  list-style: none;
}

.nav-item {
  margin-bottom: var(--spacing-xs);
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-xl);
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: all var(--transition-normal);
  border-radius: 0 25px 25px 0;
  margin-right: var(--spacing-lg);
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  transform: translateX(8px);
}

.nav-item.active .nav-link {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
  color: white;
  box-shadow: var(--shadow-md);
}

.nav-link i {
  width: 20px;
  height: 20px;
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: 280px;
  padding: var(--spacing-xl);
  background-color: var(--bg-secondary);
}

/* Header */
.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-2xl);
  padding: var(--spacing-lg) 0;
}

.header-left h1 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.header-left p {
  color: var(--text-secondary);
  font-size: var(--font-size-lg);
}

.header-controls {
  display: flex;
  gap: var(--spacing-md);
}

.btn-icon {
  width: 44px;
  height: 44px;
  border: none;
  background: var(--bg-primary);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.btn-icon:hover {
  background: var(--bg-tertiary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-icon i {
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.metric-card {
  background: var(--bg-primary);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.metric-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.metric-card.primary::before {
  background: linear-gradient(90deg, var(--primary-color), var(--primary-dark));
}

.metric-card.secondary::before {
  background: linear-gradient(90deg, var(--secondary-color), #475569);
}

.metric-card.accent::before {
  background: linear-gradient(90deg, var(--accent-color), #d97706);
}

.metric-card.warning::before {
  background: linear-gradient(90deg, var(--warning-color), #d97706);
}

.metric-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.metric-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.metric-header h3 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.metric-header i {
  width: 24px;
  height: 24px;
  color: var(--text-muted);
}

.metric-value {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-md);
}

.metric-value .value {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--text-primary);
}

.trend {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: var(--font-size-sm);
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 20px;
}

.trend.positive {
  color: var(--success-color);
  background: rgba(16, 185, 129, 0.1);
}

.trend.negative {
  color: var(--danger-color);
  background: rgba(239, 68, 68, 0.1);
}

.trend.neutral {
  color: var(--text-muted);
  background: rgba(148, 163, 184, 0.1);
}

.trend i {
  width: 14px;
  height: 14px;
}

/* Charts Grid */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--spacing-xl);
  grid-auto-rows: minmax(300px, auto);
}

.chart-container {
  background: var(--bg-primary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  padding: var(--spacing-xl);
  transition: all var(--transition-normal);
}

.chart-container:hover {
  box-shadow: var(--shadow-lg);
}

.chart-container.large {
  grid-column: span 8;
}

.chart-container.medium {
  grid-column: span 6;
}

.chart-container.small {
  grid-column: span 4;
}

.activity-panel {
  grid-column: span 4;
  background: var(--bg-primary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-color);
  padding: var(--spacing-xl);
}

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

.chart-header h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
}

.chart-controls {
  display: flex;
  gap: var(--spacing-md);
}

.filter-select {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.chart-legend {
  display: flex;
  gap: var(--spacing-lg);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.legend-color {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.legend-color.wireless {
  background: var(--primary-color);
}

.legend-color.wireline {
  background: var(--accent-color);
}

.chart-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

.progress-indicator {
  text-align: center;
}

.progress-value {
  display: block;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--primary-color);
}

.progress-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

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

/* Activity Panel */
.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
}

.panel-header h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--text-primary);
}

.btn-text {
  background: none;
  border: none;
  color: var(--primary-color);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-text:hover {
  color: var(--primary-dark);
}

.activity-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.activity-item {
  display: flex;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
}

.activity-item:hover {
  background: var(--bg-tertiary);
}

.activity-icon {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.activity-icon i {
  width: 18px;
  height: 18px;
  color: var(--primary-color);
}

.activity-content p {
  font-size: var(--font-size-sm);
  color: var(--text-primary);
  margin-bottom: 4px;
  font-weight: 500;
}

.activity-time {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* Responsive Design */
@media (max-width: 1200px) {
  .chart-container.large {
    grid-column: span 12;
  }
  
  .chart-container.medium {
    grid-column: span 6;
  }
  
  .activity-panel {
    grid-column: span 12;
  }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
    padding: var(--spacing-md);
  }
  
  .dashboard-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }
  
  .metrics-grid {
    grid-template-columns: 1fr;
  }
  
  .charts-grid {
    grid-template-columns: 1fr;
  }
  
  .chart-container.large,
  .chart-container.medium,
  .chart-container.small,
  .activity-panel {
    grid-column: span 1;
  }
  
  .chart-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }
  
  .chart-controls {
    width: 100%;
    justify-content: space-between;
  }
}

/* Print Styles */
@media print {
  .sidebar {
    display: none;
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .dashboard-header {
    border-bottom: 2px solid var(--border-color);
    padding-bottom: var(--spacing-lg);
  }
  
  .chart-container {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid var(--border-color);
  }
  
  @page {
    margin: 1in;
    @top-center {
      content: "Analytics Dashboard - Data Insights";
    }
    @bottom-center {
      content: "Created by Helium";
    }
  }
}

/* Loading Animation */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.loading {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Smooth Scrolling */
html {
  scroll-behavior: smooth;
}

/* Focus Styles for Accessibility */
button:focus,
select:focus,
a:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}