@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');
    
    :root {
      /* Colors */
      --bg-primary: #0f0f0f;
      --bg-secondary: #1a1a1a;
      --bg-card: rgba(255, 255, 255, 0.03);
      --bg-card-hover: rgba(255, 255, 255, 0.05);
      --bg-input: rgba(0, 0, 0, 0.3);
      
      --border-primary: rgba(255, 255, 255, 0.08);
      --border-secondary: rgba(255, 255, 255, 0.05);
      --border-focus: #4f46e5;
      
      --text-primary: #ffffff;
      --text-secondary: #a1a1aa;
      --text-muted: #71717a;
      
      --accent-primary: #4f46e5;
      --accent-secondary: #6366f1;
      --accent-success: #10b981;
      --accent-error: #ef4444;
      --accent-warning: #f59e0b;
      
      /* Spacing */
      --space-xs: 0.25rem;
      --space-sm: 0.5rem;
      --space-md: 1rem;
      --space-lg: 1.5rem;
      --space-xl: 2rem;
      --space-2xl: 3rem;
      
      /* Typography */
      --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      --font-mono: 'SF Mono', Monaco, Consolas, monospace;
      
      /* Transitions */
      --transition-fast: 150ms ease;
      --transition-base: 300ms ease;
      --transition-slow: 500ms ease;
      
      /* Border Radius */
      --radius-sm: 0.375rem;
      --radius-md: 0.5rem;
      --radius-lg: 0.75rem;
      --radius-xl: 1rem;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-primary);
      background: var(--bg-primary);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    
    /* Container */
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: var(--space-md);
    }
    
    .container-sm {
      max-width: 600px;
    }
    
    .container-lg {
      max-width: 1400px;
    }
    
    /* Page Layout */
    .page-wrapper {
      min-height: 100vh;
      background: var(--bg-primary);
    }
    
    /* Header */
    .page-header {
      padding: var(--space-2xl) 0 var(--space-xl);
      text-align: center;
      border-bottom: 1px solid var(--border-primary);
      margin-bottom: var(--space-2xl);
    }
    
    .page-title {
      font-size: 2.5rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-bottom: var(--space-sm);
      background: linear-gradient(to bottom, var(--text-primary), var(--text-secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    
    .page-subtitle {
      font-size: 1.125rem;
      color: var(--text-secondary);
      font-weight: 400;
    }
    
    /* Cards */
    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-primary);
      border-radius: var(--radius-lg);
      padding: var(--space-lg);
      transition: all var(--transition-base);
    }
    
    .card:hover {
      background: var(--bg-card-hover);
      border-color: var(--border-secondary);
      transform: translateY(-2px);
    }
    
    .card-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: var(--space-md);
      padding-bottom: var(--space-md);
      border-bottom: 1px solid var(--border-primary);
    }
    
    .card-title {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--text-primary);
    }
    
    .card-content {
      color: var(--text-secondary);
    }
    
    /* Grid Layouts */
    .grid {
      display: grid;
      gap: var(--space-lg);
    }
    
    .grid-2 {
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    }
    
    .grid-3 {
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
    
    .grid-4 {
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }
    
    /* Forms */
    .form-group {
      margin-bottom: var(--space-lg);
    }
    
    .form-label {
      display: block;
      font-size: 0.875rem;
      font-weight: 500;
      color: var(--text-secondary);
      margin-bottom: var(--space-sm);
    }
    
    .form-input,
    .form-select {
      width: 100%;
      padding: var(--space-sm) var(--space-md);
      background: var(--bg-input);
      border: 1px solid var(--border-primary);
      border-radius: var(--radius-md);
      color: var(--text-primary);
      font-size: 0.875rem;
      transition: all var(--transition-fast);
    }
    
    .form-input:focus,
    .form-select:focus {
      outline: none;
      border-color: var(--border-focus);
      background: rgba(79, 70, 229, 0.05);
    }
    
    .form-input::placeholder {
      color: var(--text-muted);
    }
    
    /* Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: var(--space-sm);
      padding: var(--space-sm) var(--space-lg);
      border: none;
      border-radius: var(--radius-md);
      font-size: 0.875rem;
      font-weight: 500;
      cursor: pointer;
      transition: all var(--transition-fast);
      text-decoration: none;
    }
    
    .btn-primary {
      background: var(--accent-primary);
      color: white;
    }
    
    .btn-primary:hover {
      background: var(--accent-secondary);
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
    }
    
    .btn-secondary {
      background: var(--bg-secondary);
      color: var(--text-primary);
      border: 1px solid var(--border-primary);
    }
    
    .btn-secondary:hover {
      background: var(--bg-card);
      border-color: var(--border-secondary);
    }
    
    .btn-danger {
      background: rgba(239, 68, 68, 0.1);
      color: var(--accent-error);
      border: 1px solid rgba(239, 68, 68, 0.2);
    }
    
    .btn-danger:hover {
      background: rgba(239, 68, 68, 0.2);
      border-color: rgba(239, 68, 68, 0.3);
    }
    
    .btn-sm {
      padding: var(--space-xs) var(--space-md);
      font-size: 0.75rem;
    }
    
    .btn-lg {
      padding: var(--space-md) var(--space-xl);
      font-size: 1rem;
    }
    
    .btn-block {
      width: 100%;
    }
    
    /* Tables */
    .table-wrapper {
      overflow-x: auto;
      border: 1px solid var(--border-primary);
      border-radius: var(--radius-lg);
    }
    
    .table {
      width: 100%;
      border-collapse: collapse;
    }
    
    .table th,
    .table td {
      padding: var(--space-md);
      text-align: left;
      border-bottom: 1px solid var(--border-primary);
    }
    
    .table th {
      background: var(--bg-secondary);
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
      color: var(--text-secondary);
      letter-spacing: 0.05em;
    }
    
    .table td {
      font-size: 0.875rem;
      color: var(--text-primary);
    }
    
    .table tr:last-child td {
      border-bottom: none;
    }
    
    .table tr:hover {
      background: var(--bg-card);
    }
    
    /* Status Badges */
    .badge {
      display: inline-flex;
      align-items: center;
      padding: var(--space-xs) var(--space-sm);
      border-radius: 9999px;
      font-size: 0.75rem;
      font-weight: 500;
    }
    
    .badge-success {
      background: rgba(16, 185, 129, 0.1);
      color: var(--accent-success);
      border: 1px solid rgba(16, 185, 129, 0.2);
    }
    
    .badge-error {
      background: rgba(239, 68, 68, 0.1);
      color: var(--accent-error);
      border: 1px solid rgba(239, 68, 68, 0.2);
    }
    
    .badge-warning {
      background: rgba(245, 158, 11, 0.1);
      color: var(--accent-warning);
      border: 1px solid rgba(245, 158, 11, 0.2);
    }
    
    /* Stats */
    .stat-card {
      background: var(--bg-card);
      border: 1px solid var(--border-primary);
      border-radius: var(--radius-lg);
      padding: var(--space-lg);
      text-align: center;
    }
    
    .stat-value {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: var(--space-xs);
    }
    
    .stat-label {
      font-size: 0.875rem;
      color: var(--text-secondary);
    }
    
    /* Alerts */
    .alert {
      padding: var(--space-md);
      border-radius: var(--radius-md);
      margin-bottom: var(--space-lg);
      font-size: 0.875rem;
    }
    
    .alert-error {
      background: rgba(239, 68, 68, 0.1);
      border: 1px solid rgba(239, 68, 68, 0.2);
      color: var(--accent-error);
    }
    
    .alert-success {
      background: rgba(16, 185, 129, 0.1);
      border: 1px solid rgba(16, 185, 129, 0.2);
      color: var(--accent-success);
    }
    
    /* Navigation */
    .navbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: var(--space-lg) var(--space-md);
      background: var(--bg-card);
      border: 1px solid var(--border-primary);
      border-radius: var(--radius-lg);
      margin-bottom: var(--space-xl);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      position: sticky;
      top: var(--space-md);
      z-index: 100;
    }
    
    .navbar-brand {
      display: flex;
      align-items: center;
      gap: var(--space-sm);
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--text-primary);
      text-decoration: none;
    }
    
    .navbar-brand:hover {
      color: var(--accent-primary);
      transform: translateY(-1px);
      transition: all var(--transition-fast);
    }
    
    .navbar-logo {
      font-size: 1.5rem;
      filter: drop-shadow(0 0 8px rgba(79, 70, 229, 0.3));
    }
    
    .navbar-nav {
      display: flex;
      align-items: center;
      gap: var(--space-sm);
      list-style: none;
      margin: 0;
      padding: 0;
    }
    
    .nav-item {
      position: relative;
    }
    
    .nav-link {
      display: flex;
      align-items: center;
      gap: var(--space-xs);
      padding: var(--space-sm) var(--space-md);
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.875rem;
      border-radius: var(--radius-md);
      transition: all var(--transition-fast);
      position: relative;
      overflow: hidden;
    }
    
    .nav-link::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
      opacity: 0;
      transition: opacity var(--transition-fast);
      z-index: -1;
    }
    
    .nav-link:hover::before {
      opacity: 0.1;
    }
    
    .nav-link:hover {
      color: var(--text-primary);
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.15);
    }
    
    .nav-link.active {
      color: var(--accent-primary);
      background: rgba(79, 70, 229, 0.1);
      border: 1px solid rgba(79, 70, 229, 0.2);
    }
    
    .nav-link.active::before {
      opacity: 0.05;
    }
    
    .nav-icon {
      font-size: 1rem;
    }
    
    .navbar-actions {
      display: flex;
      align-items: center;
      gap: var(--space-sm);
    }
    
    .navbar-user {
      display: flex;
      align-items: center;
      gap: var(--space-sm);
      padding: var(--space-sm) var(--space-md);
      background: var(--bg-secondary);
      border: 1px solid var(--border-primary);
      border-radius: var(--radius-lg);
      color: var(--text-secondary);
      font-size: 0.875rem;
    }
    
    .navbar-user-avatar {
      width: 24px;
      height: 24px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 600;
      font-size: 0.75rem;
    }
    
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--text-primary);
      font-size: 1.25rem;
      cursor: pointer;
      padding: var(--space-sm);
      border-radius: var(--radius-md);
      transition: all var(--transition-fast);
    }
    
    .mobile-menu-toggle:hover {
      background: var(--bg-secondary);
      transform: scale(1.05);
    }
    
    /* Mobile Navigation */
    @media (max-width: 768px) {
      .navbar {
        flex-wrap: wrap;
        position: relative;
      }
      
      .mobile-menu-toggle {
        display: block;
      }
      
      .navbar-nav {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: var(--space-xs);
        margin-top: var(--space-md);
        padding-top: var(--space-md);
        border-top: 1px solid var(--border-primary);
      }
      
      .navbar-nav.mobile-open {
        display: flex;
      }
      
      .nav-link {
        width: 100%;
        justify-content: flex-start;
      }
      
      .navbar-actions {
        order: 3;
        width: 100%;
        justify-content: center;
        margin-top: var(--space-md);
        padding-top: var(--space-md);
        border-top: 1px solid var(--border-primary);
      }
      
      .navbar-user {
        width: 100%;
        justify-content: center;
      }
    }
    
    /* Utilities */
    .text-center { text-align: center; }
    .text-right { text-align: right; }
    .text-muted { color: var(--text-muted); }
    .text-sm { font-size: 0.875rem; }
    .text-xs { font-size: 0.75rem; }
    .font-weight-500 { font-weight: 500; }
    
    .mt-sm { margin-top: var(--space-sm); }
    .mt-md { margin-top: var(--space-md); }
    .mt-lg { margin-top: var(--space-lg); }
    .mb-sm { margin-bottom: var(--space-sm); }
    .mb-md { margin-bottom: var(--space-md); }
    .mb-lg { margin-bottom: var(--space-lg); }
    
    .flex { display: flex; }
    .flex-col { flex-direction: column; }
    .items-center { align-items: center; }
    .justify-between { justify-content: space-between; }
    .gap-sm { gap: var(--space-sm); }
    .gap-md { gap: var(--space-md); }
    
    /* Responsive */
    @media (max-width: 768px) {
      .page-title {
        font-size: 2rem;
      }
      
      .grid-2,
      .grid-3,
      .grid-4 {
        grid-template-columns: 1fr;
      }
      
      .container {
        padding: var(--space-sm);
      }
      
      .hide-mobile {
        display: none;
      }
      
      .history-item {
        flex-direction: column;
        gap: var(--space-sm);
        padding: var(--space-md);
      }
      
      .history-content {
        padding-right: 0;
      }
      
      .history-amount {
        text-align: left;
        min-width: auto;
        align-self: flex-start;
      }
      
      .transaction-details {
        margin-left: var(--space-md);
      }
      
      .detail-code {
        word-break: break-all;
        max-width: 100%;
      }
    }
    
    /* Scrollbar */
    ::-webkit-scrollbar {
      width: 8px;
      height: 8px;
    }
    
    ::-webkit-scrollbar-track {
      background: var(--bg-secondary);
    }
    
    ::-webkit-scrollbar-thumb {
      background: var(--border-primary);
      border-radius: 4px;
    }
    
    ::-webkit-scrollbar-thumb:hover {
      background: var(--text-muted);
    }