/* ===== CUSTOM PROPERTIES & THEMES ===== */
:root {
  /* Dark theme (default) */
  --bg-primary: #0f0f23;
  --bg-secondary: #1a1a3a;
  --bg-tertiary: #25253f;
  --bg-elevated: #2d2d4a;
  --bg-overlay: rgba(15, 15, 35, 0.95);
  
  --text-primary: #e8e8e8;
  --text-secondary: #a0a0a0;
  --text-muted: #6b6b8d;
  --text-inverse: #1a1a3a;
  
  --accent: #00d4aa;
  --accent-hover: #00b894;
  --accent-light: rgba(0, 212, 170, 0.1);
  
  --danger: #ff6b6b;
  --danger-light: rgba(255, 107, 107, 0.1);
  --warning: #feca57;
  --warning-light: rgba(254, 202, 87, 0.1);
  --success: #00d4aa;
  --success-light: rgba(0, 212, 170, 0.1);
  --info: #74b9ff;
  --info-light: rgba(116, 185, 255, 0.1);
  
  --border: #3a3a5c;
  --border-light: #4a4a6c;
  --border-focus: var(--accent);
  
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-heavy: rgba(0, 0, 0, 0.5);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-xxl: 3rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Z-index layers */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-modal: 1030;
  --z-toast: 1040;
  --z-loading: 1050;
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --bg-elevated: #ffffff;
  --bg-overlay: rgba(255, 255, 255, 0.95);
  
  --text-primary: #2c2c2c;
  --text-secondary: #666666;
  --text-muted: #999999;
  --text-inverse: #ffffff;
  
  --border: #dee2e6;
  --border-light: #e9ecef;
  
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-heavy: rgba(0, 0, 0, 0.2);
}

/* ===== RESET & BASE STYLES ===== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-weight: 400;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-hover);
}

/* ===== LOADING OVERLAY ===== */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-loading);
  transition: opacity var(--transition-normal);
}

.loading-spinner {
  text-align: center;
  color: var(--text-secondary);
}

.loading-spinner .spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top: 3px solid var(--accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--spacing-md);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* ===== MAIN LAYOUT ===== */
.app-container {
  display: flex;
  min-height: 100vh;
}

/* ===== SIDEBAR ===== */
.sidebar {
  width: 280px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  top: 0;
  height: 100vh;
  z-index: var(--z-sticky);
  transition: transform var(--transition-normal);
  overflow-y: auto;
}

.sidebar-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.logo i {
  color: var(--accent);
  width: 24px;
  height: 24px;
}

.sidebar-toggle {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: 6px;
  transition: all var(--transition-fast);
  display: none;
}

.sidebar-toggle:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

/* Site selector */
.site-selector {
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--border);
}

.site-selector label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.site-select-dropdown {
  width: 100%;
  padding: var(--spacing-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.site-select-dropdown:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.1);
}

/* Navigation menu */
.nav-menu {
  flex: 1;
  padding: var(--spacing-md) 0;
  list-style: none;
}

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

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  color: var(--text-secondary);
  font-weight: 500;
  transition: all var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.nav-link.active {
  background: var(--accent-light);
  color: var(--accent);
  border-right: 3px solid var(--accent);
}

.nav-link i {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.nav-badge {
  margin-left: auto;
  background: var(--danger);
  color: white;
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 10px;
  min-width: 18px;
  text-align: center;
  line-height: 1.2;
}

/* Sidebar widget */
.sidebar-widget {
  margin: var(--spacing-lg);
  padding: var(--spacing-md);
  background: var(--bg-tertiary);
  border-radius: 8px;
  border: 1px solid var(--border);
}

.sidebar-widget h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.realtime-stats {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

.stat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.stat-value {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
}

.realtime-indicator {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { opacity: 1; }
  50% { opacity: 0.5; }
  100% { opacity: 1; }
}

/* ===== MAIN CONTENT ===== */
.main-content {
  flex: 1;
  margin-left: 280px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: margin-left var(--transition-normal);
}

/* Page header */
.page-header {
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  padding: var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  box-shadow: 0 1px 3px var(--shadow);
}

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

.mobile-menu-toggle {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: 6px;
  transition: all var(--transition-fast);
  display: none;
}

.mobile-menu-toggle:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.page-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

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

/* Period selector */
.period-selector {
  position: relative;
}

.period-dropdown {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.period-dropdown:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.1);
}

/* Theme toggle */
.theme-toggle {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: var(--spacing-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  background: var(--bg-elevated);
  border-color: var(--border-light);
}

.theme-icon {
  width: 18px;
  height: 18px;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

[data-theme="dark"] .light-icon {
  opacity: 0;
  transform: rotate(180deg);
}

[data-theme="dark"] .dark-icon {
  opacity: 1;
  transform: rotate(0deg);
}

[data-theme="light"] .light-icon {
  opacity: 1;
  transform: rotate(0deg);
}

[data-theme="light"] .dark-icon {
  opacity: 0;
  transform: rotate(180deg);
}

/* Action buttons */
.refresh-btn,
.dropdown-toggle {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 0.875rem;
}

.refresh-btn:hover,
.dropdown-toggle:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-light);
}

.refresh-btn i {
  width: 16px;
  height: 16px;
}

.refresh-btn.loading i {
  animation: spin 1s linear infinite;
}

/* Dropdown */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  right: 0;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 4px 12px var(--shadow);
  min-width: 180px;
  z-index: var(--z-dropdown);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  margin-top: var(--spacing-xs);
}

.dropdown:hover .dropdown-menu,
.dropdown.open .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.dropdown-item i {
  width: 16px;
  height: 16px;
}

/* Breadcrumb */
.breadcrumb {
  padding: var(--spacing-md) var(--spacing-lg) 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 0.875rem;
}

.breadcrumb-link {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.breadcrumb-link:hover {
  color: var(--accent);
}

.breadcrumb-separator {
  width: 16px;
  height: 16px;
  color: var(--text-muted);
}

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 500;
}

/* Page content */
.page-content {
  flex: 1;
  padding: var(--spacing-lg);
}

/* ===== COMPONENTS ===== */

/* Cards */
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--spacing-lg);
  box-shadow: 0 1px 3px var(--shadow);
  transition: all var(--transition-fast);
}

.card:hover {
  border-color: var(--border-light);
  box-shadow: 0 4px 12px var(--shadow);
}

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

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.card-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

/* Grid layouts */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Metric cards */
.metric-card {
  text-align: center;
  padding: var(--spacing-lg);
}

.metric-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  display: block;
  margin-bottom: var(--spacing-xs);
}

.metric-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  display: block;
  margin-bottom: var(--spacing-sm);
}

.metric-change {
  font-size: 0.75rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 2px 6px;
  border-radius: 4px;
}

.metric-change.positive {
  background: var(--success-light);
  color: var(--success);
}

.metric-change.negative {
  background: var(--danger-light);
  color: var(--danger);
}

.metric-change.neutral {
  background: var(--info-light);
  color: var(--info);
}

/* Tables */
.table-container {
  overflow-x: auto;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

.table th,
.table td {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.table th {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 600;
  white-space: nowrap;
}

.table tbody tr:hover {
  background: var(--bg-secondary);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn:hover {
  background: var(--bg-elevated);
  border-color: var(--border-light);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px var(--shadow);
}

.btn-primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border-color: var(--border);
}

.btn-danger {
  background: var(--danger);
  color: white;
  border-color: var(--danger);
}

.btn-danger:hover {
  background: #e55656;
  border-color: #e55656;
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.8125rem;
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--spacing-sm);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

/* ===== MODALS ===== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--spacing-xl);
  box-shadow: 0 8px 32px var(--shadow-heavy);
  max-width: 500px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-normal);
}

.modal.active .modal-content {
  transform: scale(1) translateY(0);
}

/* Confirm dialog */
.confirm-modal .modal-content {
  text-align: center;
  max-width: 400px;
}

.confirm-icon {
  color: var(--warning);
  margin-bottom: var(--spacing-md);
}

.confirm-icon i {
  width: 48px;
  height: 48px;
}

.confirm-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  margin-top: var(--spacing-lg);
}

/* ===== TOAST NOTIFICATIONS ===== */
.toast-container {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.toast {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: var(--spacing-md);
  box-shadow: 0 4px 12px var(--shadow);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  min-width: 300px;
  max-width: 400px;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.toast.show {
  transform: translateX(0);
}

.toast-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.toast.success {
  border-left: 4px solid var(--success);
}

.toast.success .toast-icon {
  color: var(--success);
}

.toast.error {
  border-left: 4px solid var(--danger);
}

.toast.error .toast-icon {
  color: var(--danger);
}

.toast.warning {
  border-left: 4px solid var(--warning);
}

.toast.warning .toast-icon {
  color: var(--warning);
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-weight: 600;
  font-size: 0.875rem;
  margin-bottom: 2px;
  color: var(--text-primary);
}

.toast-message {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.toast-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.toast-close:hover {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

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

/* Tablet */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .header-right {
    gap: var(--spacing-sm);
  }
  
  .dropdown-toggle span {
    display: none;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .sidebar {
    width: 100%;
    max-width: 320px;
  }
  
  .page-header {
    padding: var(--spacing-md);
  }
  
  .page-title {
    font-size: 1.25rem;
  }
  
  .page-content {
    padding: var(--spacing-md);
  }
  
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }
  
  .header-right {
    gap: var(--spacing-xs);
  }
  
  .period-dropdown {
    display: none;
  }
  
  .toast-container {
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    left: var(--spacing-sm);
  }
  
  .toast {
    min-width: auto;
    max-width: none;
  }
  
  .modal-content {
    margin: var(--spacing-md);
    padding: var(--spacing-lg);
  }
}

/* Small mobile */
@media (max-width: 480px) {
  .sidebar {
    width: 100vw;
    max-width: none;
  }
  
  .page-header {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .page-content {
    padding: var(--spacing-sm);
  }
  
  .card {
    padding: var(--spacing-md);
  }
  
  .metric-value {
    font-size: 1.5rem;
  }
}

/* ===== PRINT STYLES ===== */
@media print {
  .sidebar,
  .page-header,
  .toast-container,
  .modal,
  .loading-overlay {
    display: none !important;
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .page-content {
    padding: 0;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
}

/* ===== ACCESSIBILITY ===== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border: #000000;
    --text-secondary: #000000;
  }
  
  [data-theme="light"] {
    --border: #000000;
    --text-secondary: #000000;
  }
}