:root {
            --primary: #4361ee;
            --primary-dark: #3a56d4;
            --secondary: #7209b7;
            --accent: #f72585;
            --success: #4cc9f0;
            --warning: #f8961e;
            --dark: #212529;
            --light: #f8f9fa;
            --gray: #6c757d;
            --light-gray: #e9ecef;
            --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
            --hover-shadow: 0 6px 16px rgba(67, 97, 238, 0.1);
            --transition: all 0.2s ease;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Quicksand', sans-serif;
            background: #f5f7fa;
            color: var(--dark);
            line-height: 1.4;
            min-height: 100vh;
            font-size: 14px;
        }
        
        .app-container {
            max-width: 480px;
            margin: 0 auto;
            background-color: white;
            min-height: 100vh;
        }
        
        .app-header {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: white;
            padding: 20px 15px 15px;
            border-radius: 0 0 20px 20px;
        }
        
        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 15px;
        }
        
        .user-info {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        
        .user-avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(255, 255, 255, 0.3);
            font-size: 16px;
        }
        
        .user-details {
            flex: 1;
        }
        
        .welcome {
            font-size: 12px;
            opacity: 0.9;
            margin-bottom: 2px;
        }
        
        .username {
            font-size: 16px;
            font-weight: 700;
        }
        
        .auth-buttons {
            display: flex;
            gap: 8px;
        }
        
        .auth-btn {
            background: rgba(255, 255, 255, 0.2);
            border: none;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            color: white;
            font-size: 16px;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
            text-decoration: none;
        }
        
        .auth-btn:hover {
            background: rgba(255, 255, 255, 0.3);
        }
        
        .balance-card {
            background: rgba(255, 255, 255, 0.15);
            border-radius: 12px;
            padding: 15px;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        
        .balance-label {
            font-size: 11px;
            opacity: 0.9;
            margin-bottom: 5px;
            display: flex;
            align-items: center;
            gap: 5px;
        }
        
        .balance-amount {
            font-size: 22px;
            font-weight: 800;
            margin-bottom: 12px;
        }
        
        .balance-actions {
            display: flex;
            gap: 8px;
        }
        
        .btn-primary, .btn-secondary {
            flex: 1;
            padding: 10px;
            border-radius: 8px;
            border: none;
            font-family: 'Quicksand', sans-serif;
            font-weight: 600;
            font-size: 12px;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            text-decoration: none;
        }
        
        .btn-primary {
            background-color: var(--warning);
            color: white;
        }
        
        .btn-primary:hover {
            background-color: #e07c0c;
        }
        
        .btn-secondary {
            background-color: rgba(255, 255, 255, 0.2);
            color: white;
            border: 1px solid rgba(255, 255, 255, 0.3);
        }
        
        .btn-secondary:hover {
            background-color: rgba(255, 255, 255, 0.3);
        }
        
        .btn-disabled {
            background-color: rgba(255, 255, 255, 0.1);
            color: rgba(255, 255, 255, 0.7);
            cursor: not-allowed;
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        
        .btn-disabled:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }
        
        .main-content {
            padding: 20px 15px;
        }
        
        .section-header {
            margin: 20px 0 12px;
            padding-bottom: 8px;
            border-bottom: 1px solid var(--light-gray);
        }
        
        .section-title {
            font-size: 15px;
            font-weight: 700;
            color: var(--dark);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .services-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 10px;
            margin-bottom: 5px;
        }
        
        .service-card {
            background: white;
            border-radius: 12px;
            padding: 12px 6px;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            box-shadow: var(--card-shadow);
            transition: var(--transition);
            cursor: pointer;
            border: 1px solid var(--light-gray);
            text-decoration: none;
            color: inherit;
        }
        
        .service-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--hover-shadow);
        }
        
        .service-icon {
            width: 36px;
            height: 36px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 8px;
            font-size: 16px;
            color: white;
        }
        
        .ppob .service-icon {
            background: linear-gradient(135deg, var(--primary) 0%, var(--success) 100%);
        }
        
        .premium .service-icon {
            background: linear-gradient(135deg, var(--accent) 0%, #ff6b9d 100%);
        }
        
        .social .service-icon {
            background: linear-gradient(135deg, var(--secondary) 0%, #9d4edd 100%);
        }
        
        .service-name {
            font-size: 10px;
            font-weight: 600;
            color: var(--dark);
            line-height: 1.2;
        }
        
        .login-prompt {
            display: flex;
            justify-content: center;
            align-items: center;
            background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
            border-radius: 12px;
            padding: 20px;
            margin: 20px 0;
            text-align: center;
            border: 1px solid var(--light-gray);
        }
        
        .login-prompt-content {
            max-width: 300px;
        }
        
        .login-prompt-icon {
            font-size: 48px;
            color: var(--primary);
            margin-bottom: 15px;
        }
        
        .login-prompt-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--dark);
        }
        
        .login-prompt-text {
            font-size: 14px;
            color: var(--gray);
            margin-bottom: 20px;
        }
        
        .btn-login {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: 8px;
            font-family: 'Quicksand', sans-serif;
            font-weight: 600;
            font-size: 14px;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            display: inline-block;
        }
        
        .btn-login:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(67, 97, 238, 0.3);
        }
        
        .app-footer {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            color: white;
            padding: 20px 15px;
            text-align: center;
            margin-top: 20px;
        }
        
        .footer-logo {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 5px;
        }
        
        .footer-text {
            font-size: 12px;
            opacity: 0.8;
            margin-bottom: 3px;
        }
        
        .footer-copyright {
            font-size: 11px;
            opacity: 0.7;
            margin-top: 5px;
        }
        
        .user-id {
            font-size: 10px;
            opacity: 0.7;
            margin-top: 2px;
        }
        
        .guest-tag {
            display: inline-block;
            background: rgba(255, 255, 255, 0.3);
            padding: 2px 8px;
            border-radius: 10px;
            font-size: 10px;
            margin-top: 3px;
        }
        
        @media (max-width: 480px) {
            .services-grid {
                gap: 8px;
            }
            
            .service-card {
                padding: 10px 5px;
            }
            
            .service-icon {
                width: 32px;
                height: 32px;
                font-size: 14px;
            }
            
            .balance-amount {
                font-size: 20px;
            }
        }
        
        a {
            text-decoration: none;
        }