body {
                background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
                min-height: 100vh;
                padding: 20px 0;
            }
            .main-container {
                max-width: 900px;
                margin: 0 auto;
            }
            .card {
                border: none;
                border-radius: 15px;
                box-shadow: 0 10px 40px rgba(0,0,0,0.1);
                margin-bottom: 30px;
                overflow: hidden;
            }
            .card-header {
                background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
                color: white;
                border: none;
                padding: 25px;
            }
            .card-header h4 {
                margin: 0;
                font-weight: 600;
                display: flex;
                align-items: center;
            }
            .card-header h4 i {
                margin-right: 10px;
            }
            .card-body {
                padding: 30px;
            }
            .hero-section {
                background: white;
                border-radius: 15px;
                padding: 40px;
                text-align: center;
                margin-bottom: 30px;
                box-shadow: 0 10px 40px rgba(0,0,0,0.1);
            }
            .hero-section h1 {
                color: #667eea;
                font-weight: 700;
                margin-bottom: 15px;
            }
            .hero-section .lead {
                color: #6c757d;
                font-size: 1.1rem;
            }
            .info-row {
                padding: 15px 0;
                border-bottom: 1px solid #f0f0f0;
                display: flex;
                align-items: center;
            }
            .info-row:last-child {
                border-bottom: none;
            }
            .info-label {
                font-weight: 600;
                color: #495057;
                min-width: 180px;
                display: flex;
                align-items: center;
            }
            .info-label i {
                margin-right: 8px;
                color: #667eea;
                width: 20px;
            }
            .info-value {
                color: #6c757d;
                flex: 1;
                word-break: break-all;
            }
            .step-card {
                background: #f8f9fa;
                border-left: 4px solid #667eea;
                padding: 20px;
                margin-bottom: 20px;
                border-radius: 8px;
                transition: all 0.3s;
            }
            .step-card:hover {
                transform: translateX(5px);
                box-shadow: 0 5px 15px rgba(102, 126, 234, 0.2);
            }
            .step-number {
                display: inline-flex;
                align-items: center;
                justify-content: center;
                width: 35px;
                height: 35px;
                background: #667eea;
                color: white;
                border-radius: 50%;
                font-weight: bold;
                margin-right: 15px;
            }
            .step-title {
                font-weight: 600;
                color: #495057;
                margin-bottom: 10px;
            }
            .code-block {
                background: #2d3748;
                color: #68d391;
                padding: 15px;
                border-radius: 8px;
                font-family: "Courier New", monospace;
                margin: 10px 0;
                overflow-x: auto;
            }
            .btn-custom {
                padding: 12px 30px;
                border-radius: 25px;
                font-weight: 600;
                transition: all 0.3s;
                border: none;
            }
            .btn-primary-custom {
                background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
                color: white;
            }
            .btn-primary-custom:hover {
                transform: translateY(-2px);
                box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
                color: white;
            }
            .btn-success-custom {
                background: linear-gradient(135deg, #84fab0 0%, #8fd3f4 100%);
                color: #2d3748;
            }
            .btn-success-custom:hover {
                transform: translateY(-2px);
                box-shadow: 0 5px 20px rgba(132, 250, 176, 0.4);
            }
            .alert-custom {
                border: none;
                border-radius: 10px;
                padding: 20px;
                margin-bottom: 20px;
            }
            .alert-info-custom {
                background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
                color: #2d3748;
            }
            .alert-success-custom {
                background: linear-gradient(135deg, #d4fc79 0%, #96e6a1 100%);
                color: #2d3748;
            }
            .badge-large {
                padding: 8px 15px;
                font-size: 0.9rem;
                border-radius: 20px;
            }
            .bt-tip {
                background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
                border-left: 4px solid #ff6b6b;
                padding: 20px;
                border-radius: 8px;
                margin: 20px 0;
            }
            .bt-tip strong {
                color: #c92a2a;
                display: flex;
                align-items: center;
                margin-bottom: 10px;
            }
            .bt-tip strong i {
                margin-right: 10px;
            }
            @media (max-width: 768px) {
                .info-row {
                    flex-direction: column;
                    align-items: flex-start;
                }
                .info-label {
                    margin-bottom: 5px;
                }
                .hero-section {
                    padding: 25px;
                }
            }