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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #ffffff;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    color: #333;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

header p {
    font-size: 1.2em;
    color: #666;
}

/* 支付表单容器 */
.payment-form-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 200px);
    margin-top: 0;
}

.payment-card {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 500px;
    border: 1px solid #e0e0e0;
}

.payment-form {
    width: 100%;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-weight: 500;
    font-size: 1em;
}

.amount-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.currency-symbol {
    position: absolute;
    left: 15px;
    color: #1677FF;
    font-weight: bold;
    font-size: 1.2em;
    z-index: 1;
}

.form-group input[type="number"],
.form-group input[type="text"] {
    width: 100%;
    padding: 15px 15px 15px 50px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 1.2em;
    transition: all 0.3s;
    box-sizing: border-box;
}

.form-group input[type="number"]:focus,
.form-group input[type="text"]:focus {
    outline: none;
    border-color: #1677FF;
    box-shadow: 0 0 0 3px rgba(22, 119, 255, 0.1);
}

.form-group input[type="number"]::placeholder,
.form-group input[type="text"]::placeholder {
    color: #999;
}

.form-hint {
    display: block;
    margin-top: 5px;
    color: #666;
    font-size: 0.85em;
}

.confirm-btn {
    width: 100%;
    background: linear-gradient(135deg, #1677FF 0%, #0958D9 100%);
    color: white;
    border: none;
    padding: 18px 30px;
    font-size: 1.2em;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
    margin-top: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.confirm-btn:hover {
    background: linear-gradient(135deg, #0958D9 0%, #003EB3 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(22, 119, 255, 0.4);
}

.confirm-btn:active {
    transform: translateY(0);
}

.btn-icon {
    font-size: 1.3em;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 30px;
    border-radius: 15px;
    width: 90%;
    max-width: 600px;
    position: relative;
    animation: slideDown 0.3s;
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    position: absolute;
    right: 20px;
    top: 15px;
}

.close:hover {
    color: #000;
}

.payment-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.payment-option {
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.payment-option:hover {
    border-color: #1677FF;
    background: #E6F4FF;
    transform: scale(1.05);
}

.payment-icon {
    font-size: 3em;
    margin-bottom: 10px;
}

.payment-option h3 {
    color: #333;
    margin-bottom: 5px;
}

.payment-option p {
    color: #666;
    font-size: 0.9em;
}

.qr-container {
    text-align: center;
    padding: 20px;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.qr-container img {
    max-width: 100%;
    border: 1px solid #ddd;
    border-radius: 10px;
}

.loading {
    font-size: 1.2em;
    color: #666;
}

.order-info {
    margin-top: 20px;
    padding: 15px;
    background: #f5f5f5;
    border-radius: 8px;
    color: #333;
}

.btn-secondary {
    background: #6c757d;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 15px;
    width: 100%;
}

.btn-secondary:hover {
    background: #5a6268;
}

/* 响应式设计 */
@media (max-width: 768px) {
    header h1 {
        font-size: 2em;
    }
    
    .payment-card {
        padding: 30px 20px;
        margin: 0 10px;
    }
    
    .payment-methods {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
        padding: 20px;
    }
    
    .form-group input[type="number"],
    .form-group input[type="text"] {
        font-size: 1em;
        padding: 12px 12px 12px 45px;
    }
    
    .confirm-btn {
        font-size: 1em;
        padding: 15px 20px;
    }
}

/* 成功页面样式 */
.success-page {
    text-align: center;
    padding: 50px 20px;
    color: white;
}

.success-icon {
    font-size: 5em;
    margin-bottom: 20px;
}

.success-page h1 {
    font-size: 2.5em;
    margin-bottom: 20px;
}

.success-page p {
    font-size: 1.2em;
    margin-bottom: 30px;
}

.success-btn {
    background: white;
    color: #1677FF;
    border: none;
    padding: 12px 30px;
    font-size: 1em;
    border-radius: 25px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    font-weight: 500;
    transition: all 0.3s;
}

.success-btn:hover {
    background: #E6F4FF;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(22, 119, 255, 0.3);
}