:root {
      --primary: #1a365d;
      --primary-hover: #2d5a87;
      --secondary: #00d4aa;
      --secondary-hover: #00b894;
      --light: #f8fafc;
      --dark: #2d3748;
      --darker: #1a202c;
      --text: #2d3748;
      --text-light: #718096;
      --white: #ffffff;
      --danger: #e53e3e;
      --warning: #dd6b20;
      --success: #38a169;
      --info: #3182ce;
      --border: #e2e8f0;
      --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
      --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
      --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
      --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
      --gradient-warning: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
      background: var(--light);
      color: var(--text);
      line-height: 1.6;
    }

    /* Animations */
    @keyframes slideIn {
      from { transform: translateX(-100%); opacity: 0; }
      to { transform: translateX(0); opacity: 1; }
    }

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

    @keyframes pulse {
      0%, 100% { transform: scale(1); }
      50% { transform: scale(1.05); }
    }

    @keyframes shimmer {
      0% { background-position: -200px 0; }
      100% { background-position: calc(200px + 100%) 0; }
    }

    .animate-fade-in {
      animation: fadeIn 0.6s ease-out;
    }

    .animate-pulse {
      animation: pulse 2s infinite;
    }

    /* Header */
    header {
      background: var(--gradient-primary);
      color: white;
      padding: 0 2rem;
      height: 70px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      box-shadow: var(--shadow-lg);
      backdrop-filter: blur(10px);
    }

    .left-header {
      display: flex;
      align-items: center;
      gap: 1.5rem;
    }

    .toggle-btn {
      font-size: 1.5rem;
      cursor: pointer;
      padding: 8px;
      border-radius: 8px;
      transition: all 0.3s;
      background: rgba(255,255,255,0.1);
    }

    .toggle-btn:hover {
      background: rgba(255,255,255,0.2);
      transform: scale(1.1);
    }

    .logo {
      font-size: 1.5rem;
      font-weight: bold;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .search-container {
      position: relative;
    }

    .search-box {
      position: relative;
      display: flex;
      align-items: center;
    }

    .search-box input {
      padding: 12px 16px 12px 45px;
      border-radius: 25px;
      border: none;
      outline: none;
      width: 320px;
      background: rgba(255,255,255,0.15);
      color: white;
      backdrop-filter: blur(10px);
      transition: all 0.3s;
    }

    .search-box input::placeholder {
      color: rgba(255,255,255,0.7);
    }

    .search-box input:focus {
      width: 380px;
      background: rgba(255,255,255,0.25);
    }

    .search-icon {
      position: absolute;
      left: 15px;
      color: rgba(255,255,255,0.7);
    }

    .right-header {
      display: flex;
      align-items: center;
      gap: 1.5rem;
    }

    .icon-container {
      position: relative;
      cursor: pointer;
      padding: 10px;
      border-radius: 50%;
      transition: all 0.3s;
      background: rgba(255,255,255,0.1);
    }

    .icon-container:hover {
      background: rgba(255,255,255,0.2);
      transform: scale(1.1);
    }

    .notification-badge {
      position: absolute;
      top: 5px;
      right: 5px;
      background: var(--danger);
      color: white;
      font-size: 0.7rem;
      padding: 2px 6px;
      border-radius: 12px;
      min-width: 18px;
      height: 18px;
      display: flex;
      align-items: center;
      justify-content: center;
      animation: pulse 2s infinite;
    }

    .user-profile {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      cursor: pointer;
      padding: 8px 12px;
      border-radius: 25px;
      transition: all 0.3s;
      background: rgba(255,255,255,0.1);
    }

    .user-profile:hover {
      background: rgba(255,255,255,0.2);
    }

    .user-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      border: 2px solid rgba(255,255,255,0.3);
    }

    /* Sidebar */
    #sidebar {
      position: fixed;
      top: 70px;
      left: 0;
      width: 280px;
      height: calc(100vh - 70px);
      background: var(--white);
      padding: 1.5rem 0;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border-right: 1px solid var(--border);
    }

    #sidebar.collapsed {
      width: 80px;
    }

    .sidebar-section {
      margin-bottom: 2rem;
    }

    .sidebar-title {
      padding: 0 1.5rem 0.5rem;
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
      color: var(--text-light);
      letter-spacing: 0.05em;
    }

    #sidebar.collapsed .sidebar-title {
      display: none;
    }

    #sidebar ul {
      list-style: none;
    }

    #sidebar li {
      position: relative;
      margin: 0.25rem 1rem;
      border-radius: 12px;
      overflow: hidden;
    }

    #sidebar li a {
      display: flex;
      align-items: center;
      gap: 1rem;
      padding: 1rem;
      text-decoration: none;
      color: var(--text);
      transition: all 0.3s;
      white-space: nowrap;
      font-weight: 500;
    }

    #sidebar li:hover a,
    #sidebar li.active a {
      background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-hover) 100%);
      color: white;
      transform: translateX(5px);
    }

    #sidebar li.active::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      width: 4px;
      background: var(--secondary);
      border-radius: 0 4px 4px 0;
    }

    .menu-icon {
      font-size: 1.2rem;
      width: 24px;
      text-align: center;
    }

    #sidebar.collapsed li a span {
      opacity: 0;
      visibility: hidden;
    }

    /* Tooltip for collapsed sidebar */
    .tooltip {
      position: absolute;
      left: 70px;
      top: 50%;
      transform: translateY(-50%);
      background: var(--dark);
      color: white;
      padding: 8px 12px;
      border-radius: 6px;
      font-size: 0.875rem;
      opacity: 0;
      visibility: hidden;
      transition: all 0.3s;
      z-index: 1000;
      white-space: nowrap;
    }

    .tooltip::before {
      content: '';
      position: absolute;
      right: 100%;
      top: 50%;
      transform: translateY(-50%);
      border: 6px solid transparent;
      border-right-color: var(--dark);
    }

    #sidebar.collapsed li:hover .tooltip {
      opacity: 1;
      visibility: visible;
    }

    /* Main content */
    #main {
      margin-left: 280px;
      margin-top: 70px;
      padding: 2rem;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      min-height: calc(100vh - 70px);
    }

    #main.collapsed {
      margin-left: 80px;
    }

    .page-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 2rem;
    }

    .page-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text);
    }

    .breadcrumb {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      color: var(--text-light);
      font-size: 0.9rem;
      margin-top: 0.5rem;
    }

    .breadcrumb a {
      color: var(--secondary);
      text-decoration: none;
    }

    .breadcrumb a:hover {
      text-decoration: underline;
    }

    .action-buttons {
      display: flex;
      gap: 1rem;
    }

    .btn {
      padding: 12px 24px;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      transition: all 0.3s;
      font-size: 0.9rem;
    }

    .btn-primary {
      background: var(--gradient-primary);
      color: white;
      box-shadow: var(--shadow);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-lg);
    }

    .btn-secondary {
      background: var(--gradient-primary);
      color: var(--text);
      border: 1px solid var(--border);
    }

    .btn-secondary:hover {
      background: var(--light);
      transform: translateY(-1px);
    }

    /* Stats Grid */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 1.5rem;
      margin-bottom: 2rem;
    }

    .stat-card {
      padding: 2rem;
      border-radius: 16px;
      box-shadow: var(--shadow);
      position: relative;
      overflow: hidden;
      transition: all 0.3s;
    }

    .stat-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
    }

    .stat-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: var(--gradient-primary);
    }

    .stat-card.revenue::before { background: var(--gradient-secondary); }
    .stat-card.users::before { background: var(--gradient-success); }
    .stat-card.tasks::before { background: var(--gradient-warning); }

    .stat-header {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      margin-bottom: 1rem;
    }

    .stat-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      background: var(--gradient-primary);
      color: white;
    }

    .stat-card.revenue .stat-icon { background: var(--gradient-secondary); }
    .stat-card.users .stat-icon { background: var(--gradient-success); }
    .stat-card.tasks .stat-icon { background: var(--gradient-warning); }

    .stat-value {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--text);
      line-height: 1;
      margin-bottom: 0.5rem;
    }

    .stat-label {
      color: var(--text-light);
      font-weight: 500;
      margin-bottom: 1rem;
    }

    .stat-change {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 0.875rem;
      font-weight: 600;
    }

    .stat-change.positive {
      color: var(--success);
    }

    .stat-change.negative {
      color: var(--danger);
    }

    .progress-container {
      margin-top: 1rem;
    }

    .progress-bar {
      background: #e2e8f0;
      border-radius: 10px;
      height: 8px;
      overflow: hidden;
      position: relative;
    }

    .progress-fill {
      height: 100%;
      border-radius: 10px;
      transition: width 1s ease-in-out;
      background: var(--gradient-primary);
      position: relative;
    }

    .progress-fill::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      bottom: 0;
      right: 0;
      background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
      animation: shimmer 2s infinite;
    }

    /* Chart Container */
    .chart-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 1.5rem;
      margin-bottom: 2rem;
    }

    .chart-card {
      padding: 2rem;
      border-radius: 16px;
      box-shadow: var(--shadow);
    }

    .chart-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 2rem;
    }

    .chart-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text);
    }

    .chart-filters {
      display: flex;
      gap: 0.5rem;
    }

    .filter-btn {
      padding: 6px 12px;
      border: 1px solid var(--border);
      border-radius: 6px;
      cursor: pointer;
      font-size: 0.8rem;
      transition: all 0.3s;
    }

    .filter-btn.active,
    .filter-btn:hover {
      background: var(--secondary);
      color: white;
      border-color: var(--secondary);
    }

    .mini-chart {
      height: 80px;
      background: var(--gradient-primary);
      border-radius: 8px;
      position: relative;
      overflow: hidden;
      margin-top: 1rem;
    }

    /* Data Table */
    .table-container {
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow);
      margin-bottom: 2rem;
    }

    .table-header {
      padding: 2rem 2rem 1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid var(--border);
    }

    .table-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text);
    }

    .table-actions {
      display: flex;
      gap: 1rem;
      align-items: center;
    }

    .search-mini {
      padding: 8px 12px;
      border: 1px solid var(--border);
      border-radius: 6px;
      font-size: 0.875rem;
      width: 200px;
    }

    .table-responsive {
      overflow-x: auto;
    }

    table {
      width: 100%;
      border-collapse: collapse;
    }

    th, td {
      padding: 1rem;
      text-align: left;
      border-bottom: 1px solid var(--border);
    }

    th {
      background: var(--light);
      font-weight: 600;
      color: var(--text);
      font-size: 0.875rem;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    td {
      font-size: 0.9rem;
    }

    .status-badge {
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    .status-active {
      background: rgba(56, 161, 105, 0.1);
      color: var(--success);
    }

    .status-pending {
      background: rgba(221, 107, 32, 0.1);
      color: var(--warning);
    }

    .status-inactive {
      background: rgba(229, 62, 62, 0.1);
      color: var(--danger);
    }

    .user-cell {
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }

    .user-avatar-small {
      width: 32px;
      height: 32px;
      border-radius: 50%;
    }

    /* Notification Panel */
    .notification-panel {
      position: fixed;
      top: 70px;
      right: -400px;
      width: 380px;
      height: calc(100vh - 70px);
      box-shadow: var(--shadow-lg);
      transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      z-index: 999;
      overflow-y: auto;
    }

    .notification-panel.open {
      right: 0;
    }

    .notification-header {
      padding: 2rem;
      border-bottom: 1px solid var(--border);
      display: flex;
      justify-content: between;
      align-items: center;
    }

    .notification-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text);
    }

    .notification-close {
      cursor: pointer;
      padding: 8px;
      border-radius: 6px;
      transition: all 0.3s;
    }

    .notification-close:hover {
      background: var(--light);
    }

    .notification-item {
      padding: 1.5rem 2rem;
      border-bottom: 1px solid var(--border);
      transition: all 0.3s;
      cursor: pointer;
    }

    .notification-item:hover {
      background: var(--light);
    }

    .notification-item.unread {
      background: rgba(0, 212, 170, 0.05);
      border-left: 4px solid var(--secondary);
    }

    .notification-content {
      display: flex;
      gap: 1rem;
    }

    .notification-icon {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      background: var(--light);
      flex-shrink: 0;
    }

    .notification-text {
      flex: 1;
    }

    .notification-message {
      font-weight: 500;
      margin-bottom: 0.25rem;
      color: var(--text);
    }

    .notification-time {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* Quick Actions */
    .quick-actions {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 1rem;
      margin-bottom: 2rem;
    }

    .quick-action {
      padding: 1.5rem;
      border-radius: 12px;
      box-shadow: var(--shadow);
      text-align: center;
      transition: all 0.3s;
      cursor: pointer;
      text-decoration: none;
      color: var(--text);
    }

    .quick-action:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-lg);
    }

    .quick-action-icon {
      font-size: 2rem;
      margin-bottom: 1rem;
      display: block;
    }

    .quick-action-label {
      font-weight: 600;
      margin-bottom: 0.5rem;
    }

    .quick-action-desc {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* Mobile Responsive */
    @media (max-width: 1024px) {
      .chart-grid {
        grid-template-columns: 1fr;
      }
      
      .stats-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      }
    }

    @media (max-width: 768px) {
      header {
        padding: 0 1rem;
      }

      .search-box input {
        width: 200px;
      }

      .search-box input:focus {
        width: 240px;
      }

      #main {
        margin-left: 80px;
        padding: 1rem;
      }

      #sidebar {
        width: 80px;
      }

      #sidebar.collapsed .sidebar-title,
      #sidebar li a span {
        display: none;
      }

      .page-title {
        font-size: 1.5rem;
      }

      .stats-grid {
        grid-template-columns: 1fr;
      }

      .action-buttons {
        flex-direction: column;
        gap: 0.5rem;
      }

      .table-actions {
        flex-direction: column;
        gap: 0.5rem;
        align-items: stretch;
      }

      .search-mini {
        width: 100%;
      }
    }

    /* Dark mode support */
    @media (prefers-color-scheme: dark) {
      :root {
        --light: #1a202c;
        --white: #2d3748;
        --text: #f7fafc;
        --text-light: #a0aec0;
        --border: #4a5568;
      }
    }

    /* Loading states */
    .loading {
      background: linear-gradient(90deg, #f0f0f0 25%, transparent 50%, #f0f0f0 75%);
      background-size: 200px 100%;
      animation: shimmer 1.5s infinite;
    }

    /* Custom scrollbar */
    ::-webkit-scrollbar {
      width: 8px;
    }

    ::-webkit-scrollbar-track {
      background: var(--light);
    }

    ::-webkit-scrollbar-thumb {
      background: var(--border);
      border-radius: 4px;
    }

    ::-webkit-scrollbar-thumb:hover {
      background: var(--text-light);
    }