:root {
    --primary: #4a6bff;
    --secondary: #27ae60;
    --error: #e74c3c;
    --light: #f8f9fa;
    --dark: #2c3e50;
    --gray: #7f8c8d;
}
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background-color: #f5f7fa;
}
.container {
    max-width: 1000px;
    margin: 40px auto;
    padding: 30px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}
.header {
    text-align: center;
    margin-bottom: 30px;
}
.header h1 {
    color: var(--dark);
    font-size: 28px;
    margin-bottom: 10px;
}
.header p {
    color: var(--gray);
    font-size: 16px;
}
.payment-layout {
    display: flex;
    gap: 40px;
    align-items: flex-start;
}
.payment-form {
    flex: 2;
}
.order-summary {
    flex: 1;
    background: var(--light);
    padding: 25px;
    border-radius: 10px;
    height: fit-content;
    position: sticky;
    top: 20px;
}
.form-group {
    margin-bottom: 20px;
}
.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark);
}
.form-group input, .form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    transition: border 0.3s;
}
.form-group input:focus, .form-group select:focus {
    border-color: var(--primary);
    outline: none;
}
.card-element {
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 6px;
    background: white;
    margin-bottom: 15px;
}
.card-errors {
    color: var(--error);
    font-size: 14px;
    margin-top: -10px;
    margin-bottom: 15px;
}
.payment-options {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
}
.payment-option {
    flex: 1;
    padding: 15px;
    background: white;
    border: 2px solid #eee;
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}
.payment-option.selected {
    border-color: var(--primary);
    background: rgba(74, 107, 255, 0.05);
}
.payment-option i {
    font-size: 24px;
    color: var(--primary);
    margin-bottom: 10px;
}
.payment-option h4 {
    font-size: 16px;
    margin-bottom: 8px;
}
.payment-option p {
    font-size: 14px;
    color: var(--gray);
}
.price {
    font-size: 24px;
    font-weight: bold;
    color: var(--dark);
    margin: 10px 0;
}
.btn-pay {
    width: 100%;
    padding: 15px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.3s;
}
.btn-pay:hover {
    background: #3a5bef;
}
.btn-pay i.fa-spinner {
    margin-right: 8px;
}
.summary-title {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--dark);
}
.summary-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}
.summary-total {
    font-size: 20px;
    font-weight: bold;
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #eee;
}
.stripe-logo {
    text-align: center;
    margin: 20px 0;
    color: var(--gray);
    font-size: 14px;
}
.secure-notice {
    text-align: center;
    color: var(--secondary);
    font-size: 14px;
    margin-top: 10px;
}
.secure-notice i {
    color: var(--secondary);
    margin-right: 5px;
}

.payment-methods {
    margin: 20px 0;
}
.payment-method {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}
.payment-method input[type="radio"] {
    margin-right: 10px;
}
.payment-method label {
    display: flex;
    align-items: center;
    cursor: pointer;
    width: 100%;
}
.payment-method i {
    margin-right: 10px;
    font-size: 20px;
}
.payment-method .method-details {
    flex-grow: 1;
}
#submit-button {
    width: 100%;
    padding: 12px;
    background-color: #007BFF;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    margin-top: 10px;
}
#submit-button:hover {
    background-color: #0056b3;
}
#submit-button i {
    margin-right: 8px;
}

@media (max-width: 768px) {
    .payment-layout {
        flex-direction: column;
    }
    .payment-options {
        flex-direction: column;
    }
}