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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

header {
    text-align: center;
    margin-bottom: 40px;
    color: white;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    font-size: 1.2rem;
    opacity: 0.9;
}

.payment-form {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.payment-form h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
    font-size: 1.8rem;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
}

.form-group input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e1e5e9;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.payment-buttons {
    display: flex;
    gap: 20px;
    flex-direction: column;
    margin-top: 30px;
}

.payment-btn {
    background: white;
    border: 2px solid #e1e5e9;
    padding: 25px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.payment-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.installments-btn {
    border-color: #4CAF50;
}

.installments-btn:hover {
    background: linear-gradient(135deg, #4CAF50, #45a049);
    color: white;
    border-color: #4CAF50;
}

.credit-btn {
    border-color: #2196F3;
}

.credit-btn:hover {
    background: linear-gradient(135deg, #2196F3, #1976D2);
    color: white;
    border-color: #2196F3;
}

.btn-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.btn-text {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.btn-description {
    font-size: 0.9rem;
    opacity: 0.7;
}

.loading {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    text-align: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.success-page {
    background: white;
    padding: 60px 40px;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
    text-align: center;
}

.success-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.success-page h1 {
    color: #4CAF50;
    margin-bottom: 20px;
    font-size: 2rem;
}

.success-page p {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 30px;
    line-height: 1.6;
}

.return-btn {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 15px 30px;
    border-radius: 8px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.return-btn:hover {
    transform: translateY(-2px);
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .payment-form {
        padding: 20px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .payment-buttons {
        gap: 15px;
    }
    
    .payment-btn {
        padding: 20px;
    }
}