/* 全局样式 */
        * {
            box-sizing: border-box;
            font-family: 'Segoe UI', system-ui, sans-serif;
        }

        body {
            background: #f5f7fa;
            margin: 0;
            padding: 2rem;
        }

        /* 支付容器 */
        .payment-container {
            max-width: 800px;
            margin: 0 auto;
            background: white;
            border-radius: 12px;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
            overflow: hidden;
        }

        /* 标题样式 */
        .payment-header {
            background: #003087;
            padding: 1.5rem;
            text-align: center;
        }

        .payment-title {
            color: white;
            margin: 0;
            font-size: 1.8rem;
            font-weight: 600;
        }

        /* 表单布局 */
        .form-wrapper {
            padding: 2rem;
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 2fr;
            gap: 1.5rem;
            align-items: center;
            margin-bottom: 1.5rem;
        }

        /* 输入框样式 */
        .input-group {
            position: relative;
        }

        .input-label {
            display: block;
            margin-bottom: 0.5rem;
            color: #2c3e50;
            font-weight: 500;
            font-size: 0.95rem;
        }

        .form-input {
            width: 100%;
            padding: 0.85rem 1rem;
            border: 2px solid #e0e4e9;
            border-radius: 8px;
            font-size: 1rem;
            transition: all 0.2s ease;
            background: #f8f9fb;
        }

        .form-input:focus {
            border-color: #009cde;
            box-shadow: 0 0 0 3px rgba(0, 156, 222, 0.15);
            outline: none;
            background: white;
        }

        /* 支付按钮 */
        .paypal-btn {
            background: linear-gradient(135deg, #003087 0%, #009cde 100%);
            color: white;
            padding: 1rem 2rem;
            border: none;
            border-radius: 8px;
            font-size: 1.1rem;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 0.8rem;
        }

        .paypal-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 48, 135, 0.3);
        }

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

        /* 信息提示 */
        .fee-notice {
            background: #fff9e6;
            padding: 1rem;
            border-radius: 8px;
            margin: 1.5rem 0;
            border-left: 4px solid #ffc107;
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .form-row {
                grid-template-columns: 1fr;
            }
            
            body {
                padding: 1rem;
            }
        }