* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        :root {
            --primary: #2563eb;
            --primary-light: #3b82f6;
            --secondary: #06b6d4;
            --accent: #f59e0b;
            --success: #10b981;
            --warning: #f59e0b;
            --error: #ef4444;
            --light: #ffffff;
            --light-secondary: #f8fafc;
            --light-border: #e2e8f0;
            --text-primary: #1e293b;
            --text-secondary: #64748b;
            --text-light: #94a3b8;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
        }

        body {
            background: linear-gradient(135deg, #f1f5f9 0%, #e2e8f0 100%);
            color: var(--text-primary);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            height: 90vh;
            background: var(--light);
            border-radius: 16px;
            border: 1px solid var(--light-border);
            box-shadow: var(--shadow-lg);
            overflow: hidden;
            display: flex;
        }

        /* Sidebar Styles */
        .sidebar {
            width: 280px;
            background: var(--light);
            border-right: 1px solid var(--light-border);
            padding: 30px 20px;
            display: flex;
            flex-direction: column;
            transition: all 0.3s ease;
        }

        .logo {
            display: flex;
            align-items: center;
            margin-bottom: 40px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--light-border);
        }

        .logo i {
            font-size: 28px;
            color: var(--primary);
            margin-right: 12px;
        }

        .logo h1 {
            font-size: 20px;
            font-weight: 700;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .nav-links {
            list-style: none;
            flex-grow: 1;
        }

        .nav-links li {
            margin-bottom: 8px;
        }

        .nav-links a {
            display: flex;
            align-items: center;
            padding: 14px 16px;
            border-radius: 12px;
            color: var(--text-secondary);
            text-decoration: none;
            transition: all 0.3s ease;
            font-weight: 500;
        }

        .nav-links a:hover {
            background: var(--light-secondary);
            color: var(--primary);
            transform: translateX(5px);
        }

        .nav-links a.active {
            background: linear-gradient(to right, var(--primary-light), var(--primary));
            color: white;
            box-shadow: var(--shadow);
        }

        .nav-links i {
            margin-right: 12px;
            font-size: 18px;
            width: 20px;
            text-align: center;
        }

        .user-info {
            display: flex;
            align-items: center;
            padding: 20px 10px;
            border-top: 1px solid var(--light-border);
            margin-top: auto;
        }

        .user-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 12px;
            font-weight: bold;
            color: white;
            font-size: 18px;
        }

        .user-details h3 {
            font-size: 15px;
            margin-bottom: 4px;
            color: var(--text-primary);
        }

        .user-details p {
            font-size: 13px;
            color: var(--text-light);
        }

        /* Main Content Styles */
        .main-content {
            flex-grow: 1;
            padding: 30px;
            overflow-y: auto;
            background: var(--light-secondary);
        }

        .page {
            display: none;
            animation: fadeIn 0.5s ease;
        }

        .page.active {
            display: block;
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .page-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
        }

        .page-title {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .stats-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 20px;
            margin-bottom: 30px;
        }

        .stat-card {
            background: var(--light);
            border: 1px solid var(--light-border);
            border-radius: 16px;
            padding: 24px;
            display: flex;
            align-items: center;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow);
        }

        .stat-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
        }

        .stat-card:nth-child(1)::before { background: linear-gradient(to right, var(--primary), var(--primary-light)); }
        .stat-card:nth-child(2)::before { background: linear-gradient(to right, var(--success), #34d399); }
        .stat-card:nth-child(3)::before { background: linear-gradient(to right, var(--warning), #fbbf24); }
        .stat-card:nth-child(4)::before { background: linear-gradient(to right, var(--secondary), #22d3ee); }

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

        .stat-icon {
            width: 60px;
            height: 60px;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 16px;
            font-size: 24px;
            color: white;
        }

        .stat-card:nth-child(2) .stat-icon { background: linear-gradient(135deg, var(--success), #34d399); }
        .stat-card:nth-child(3) .stat-icon { background: linear-gradient(135deg, var(--warning), #fbbf24); }
        .stat-card:nth-child(4) .stat-icon { background: linear-gradient(135deg, var(--secondary), #22d3ee); }

        .stat-info h3 {
            font-size: 14px;
            color: var(--text-secondary);
            margin-bottom: 6px;
            font-weight: 500;
        }

        .stat-info p {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .card {
            background: var(--light);
            border: 1px solid var(--light-border);
            border-radius: 16px;
            padding: 28px;
            margin-bottom: 24px;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow);
        }

        .card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(to right, var(--primary), var(--primary-light));
        }

        .card-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .card-title {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-primary);
        }

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

        .table th, .table td {
            padding: 14px 16px;
            text-align: left;
            border-bottom: 1px solid var(--light-border);
        }

        .table th {
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 14px;
            background: var(--light-secondary);
        }

        .table td {
            color: var(--text-primary);
            font-size: 14px;
        }

        .status {
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
        }

        .status.pending {
            background: #fef3c7;
            color: #d97706;
        }

        .status.approved {
            background: #d1fae5;
            color: #059669;
        }

        .status.rejected {
            background: #fee2e2;
            color: #dc2626;
        }

        .btn {
            padding: 12px 24px;
            border-radius: 10px;
            border: none;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 14px;
        }

        .btn-primary {
            background: linear-gradient(to right, var(--primary), var(--primary-light));
            color: white;
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
        }

        .btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none !important;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .form-control {
            width: 100%;
            padding: 14px 16px;
            background: var(--light);
            border: 1px solid var(--light-border);
            border-radius: 10px;
            color: var(--text-primary);
            font-size: 16px;
            transition: all 0.3s ease;
        }

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

        .login-container {
            width: 100%;
            max-width: 420px;
            margin: 0 auto;
            padding: 40px;
            background: var(--light);
            border-radius: 20px;
            border: 1px solid var(--light-border);
            box-shadow: var(--shadow-lg);
            position: relative;
            overflow: hidden;
        }

        .login-container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 6px;
            background: linear-gradient(to right, var(--primary), var(--secondary), var(--accent));
        }

        .auth-title {
            text-align: center;
            margin-bottom: 30px;
            font-size: 28px;
            font-weight: 700;
            color: var(--text-primary);
        }

        .auth-switch {
            text-align: center;
            margin-top: 20px;
            font-size: 14px;
            color: var(--text-light);
        }

        .toggle-pages {
            display: none;
        }

        .error-message {
            color: var(--error);
            font-size: 14px;
            margin-top: 5px;
            display: none;
        }

        /* IMEI Checker Styles */
        .imei-checker {
            background: var(--light);
            border: 1px solid var(--light-border);
            border-radius: 16px;
            padding: 28px;
            margin-bottom: 24px;
            box-shadow: var(--shadow);
        }

        .imei-checker-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
        }

        .imei-checker-title {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-primary);
        }

        .captcha-box {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 16px;
        }

        .captcha-box img {
            border: 1px solid var(--light-border);
            border-radius: 8px;
            height: 50px;
            cursor: pointer;
            transition: transform 0.3s;
        }

        .captcha-box img:hover {
            transform: scale(1.05);
        }

        .loading {
            display: none;
            text-align: center;
            margin: 20px 0;
            color: var(--primary);
        }

        .loading i {
            animation: spin 1s linear infinite;
            font-size: 24px;
            margin-bottom: 10px;
        }

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

        .error {
            color: var(--error);
            background: #fef2f2;
            padding: 16px;
            border-radius: 10px;
            margin-top: 20px;
            display: none;
            border-left: 4px solid var(--error);
        }

        .result-container {
            display: none;
            margin-top: 25px;
            animation: fadeIn 0.5s ease;
        }

        .phone-card {
            background: linear-gradient(135deg, #1e40af 0%, #2563eb 100%);
            color: white;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: var(--shadow-lg);
        }

        .card-header-imei {
            background: rgba(255, 255, 255, 0.1);
            padding: 20px 24px;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .card-header-imei i {
            color: #fbbf24;
            font-size: 22px;
        }

        .card-header-imei h3 {
            font-size: 18px;
            font-weight: 600;
        }

        .card-content-imei {
            padding: 24px;
        }

        .info-row {
            display: flex;
            margin-bottom: 18px;
            align-items: flex-start;
        }

        .info-icon {
            color: #fbbf24;
            font-size: 20px;
            margin-right: 14px;
            min-width: 24px;
        }

        .info-text {
            flex: 1;
        }

        .info-label {
            font-weight: 600;
            font-size: 14px;
            color: #fbbf24;
            margin-bottom: 6px;
        }

        .info-value {
            font-size: 16px;
            word-break: break-word;
            line-height: 1.5;
        }

        .status-badge {
            display: inline-block;
            padding: 6px 12px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            margin-left: 8px;
        }

        .status-on {
            background-color: #ef4444;
            color: white;
        }

        .status-off {
            background-color: #10b981;
            color: white;
        }

        .additional-info {
            background: rgba(255, 255, 255, 0.1);
            border-radius: 10px;
            padding: 18px;
            margin-top: 18px;
        }

        .approval-actions {
            display: flex;
            gap: 12px;
            margin-top: 24px;
        }

        .btn-approve {
            background: linear-gradient(to right, #10b981, #34d399);
            color: white;
            flex: 1;
        }

        .btn-approve:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(16, 185, 129, 0.3);
        }

        .btn-reject {
            background: linear-gradient(to right, #ef4444, #f87171);
            color: white;
            flex: 1;
        }

        .btn-reject:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(239, 68, 68, 0.3);
        }

        .brand-logo {
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 24px;
        }

        .brand-logo-text {
            font-size: 24px;
            font-weight: 700;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-align: center;
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .container {
                flex-direction: column;
                height: auto;
            }
            
            .sidebar {
                width: 100%;
                padding: 20px;
                position: absolute;
                z-index: 100;
                height: 100%;
                transform: translateX(-100%);
            }
            
            .sidebar.active {
                transform: translateX(0);
            }
            
            .nav-links {
                display: block;
                margin-bottom: 15px;
            }
            
            .nav-links li {
                margin-bottom: 8px;
            }
            
            .user-info {
                display: none;
            }
            
            .toggle-pages {
                display: block;
                position: fixed;
                bottom: 20px;
                right: 20px;
                width: 56px;
                height: 56px;
                border-radius: 50%;
                background: linear-gradient(to right, var(--primary), var(--primary-light));
                display: flex;
                align-items: center;
                justify-content: center;
                color: white;
                font-size: 22px;
                box-shadow: var(--shadow-lg);
                z-index: 100;
            }

            .captcha-box {
                flex-direction: column;
                align-items: stretch;
            }
            
            .captcha-box img {
                align-self: center;
                margin-bottom: 12px;
            }
            
            .main-content {
                padding: 20px;
            }
            
            .page-header {
                flex-direction: column;
                gap: 16px;
                align-items: flex-start;
            }
            
            .stats-container {
                grid-template-columns: 1fr;
            }
            
            .approval-actions {
                flex-direction: column;
            }
        }

        /* Notification Styles */
        .notification {
            position: fixed;
            top: 20px;
            right: 20px;
            padding: 16px 20px;
            border-radius: 10px;
            color: white;
            font-weight: 600;
            z-index: 1000;
            animation: slideInRight 0.3s ease;
            max-width: 320px;
            box-shadow: var(--shadow-lg);
        }

        .notification-success {
            background: linear-gradient(to right, #10b981, #34d399);
        }

        .notification-error {
            background: linear-gradient(to right, #ef4444, #f87171);
        }

        .notification-info {
            background: linear-gradient(to right, var(--primary), var(--primary-light));
        }

        @keyframes slideInRight {
            from { transform: translateX(100%); opacity: 0; }
            to { transform: translateX(0); opacity: 1; }
        }

        @keyframes slideOutRight {
            from { transform: translateX(0); opacity: 1; }
            to { transform: translateX(100%); opacity: 0; }
        }