.step-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 30px;
            position: relative;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }

        .step-nav::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 0;
            right: 0;
            height: 2px;
            background-color: #ddd;
            z-index: 1;
            transform: translateY(-50%);
        }

        .step-progress {
            position: absolute;
            top: 50%;
            left: 0;
            height: 2px;
            background-color: #000;
            z-index: 2;
            transform: translateY(-50%);
            transition: width 0.3s ease;
        }

        .step-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            position: relative;
            z-index: 3;
            background-color: #f8f8f8;
            padding: 0 5px;
        }

        .step-circle {
            width: 35px;
            height: 35px;
            border-radius: 50%;
            background-color: #ddd;
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            margin-bottom: 5px;
            transition: all 0.3s ease;
        }

        .step-circle.active {
            background-color: #000;
        }

        .step-text {
            font-size: 12px;
            color: #666;
            text-align: center;
        }

        .step-text.active {
            color: #000;
            font-weight: bold;
        }

        /* 表单容器 */
        .form-container {
            max-width: 1159px;
            margin: 0 auto;
            background-color: #fff;
            padding: 20px;
            border-radius: 12px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.05);
        }

        /* 表单分组 */
        .form-group {
            margin-bottom: 20px;
        }

        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 20px;
        }

        label {
            display: block;
            font-size: 14px;
            font-weight: bold;
            margin-bottom: 8px;
            color: #333;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        input, select, textarea {
            width: 100%;
            padding: 15px;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-size: 16px;
            background-color: #e8f0fe;
        }

        input::placeholder, textarea::placeholder {
            color: #999;
        }

        textarea {
            min-height: 100px;
            resize: vertical;
            background-color: #fff;
        }

        /* 赛事选择卡片 */
        .race-options {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-bottom: 20px;
        }

        .race-card {
            border: 2px solid #ddd;
            border-radius: 12px;
            padding: 20px;
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .race-card.selected {
            border-color: #000;
            background-color: #fff;
            transform: scale(1.02);
        }

        .race-card h3 {
            font-size: 24px;
            margin-bottom: 8px;
        }

        .race-card .desc {
            color: #666;
            margin-bottom: 15px;
        }

        .race-card .price {
            font-size: 28px;
            font-weight: bold;
            margin-bottom: 10px;
        }

        .race-card .original-price {
            text-decoration: line-through;
            color: #999;
            font-size: 20px;
            margin-right: 10px;
        }

        .race-card .early-bird {
            color: #2ecc71;
            font-size: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 5px;
        }

        .selected-info {
            background-color: #000;
            color: #fff;
            padding: 15px 20px;
            border-radius: 12px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 20px;
            font-size: 18px;
            font-weight: bold;
        }

        /* 按钮样式 */
        .btn-group {
            display: flex;
            justify-content: space-between;
            gap: 15px;
            margin-top: 30px;
        }

        .btn {
            padding: 15px 30px;
            border: 1px solid #999;
            border-radius: 8px;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s ease;
            flex: 1;
            text-align: center;
        }

        .btn-back {
            background-color: #fff;
            color: #999;
        }

        .btn-next {
            background-color: #000;
            color: #fff;
            border-color: #000;
        }

        .btn:hover {
            opacity: 0.9;
        }

        /* 确认表格 */
        .review-table {
            width: 100%;
            border-collapse: collapse;
            margin-bottom: 30px;
            background-color: #f0f0f0;
            border-radius: 12px;
            overflow: hidden;
        }

        .review-table td {
            padding: 15px 20px;
            border-bottom: 1px solid #ddd;
            font-size: 16px;
        }

        .review-table tr:last-child td {
            border-bottom: none;
        }

        .review-table td:first-child {
            font-weight: bold;
            color: #666;
            width: 40%;
        }

        .total-fee {
            color: #e74c3c;
            font-size: 20px;
            font-weight: bold;
        }

        /* 支付方式 */
        .payment-method {
            border: 1px solid #ddd;
            border-radius: 8px;
            padding: 15px;
            margin-bottom: 15px;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .payment-method.selected {
            border-color: #000;
            background-color: #000;
            color: #fff;
        }

        .payment-method input {
            margin-right: 10px;
            width: auto;
        }

        .payment-method h4 {
            display: inline-block;
            font-size: 18px;
            margin-bottom: 5px;
        }

        .payment-method p {
            font-size: 14px;
            margin-left: 25px;
            opacity: 0.8;
        }

        .wallet-details {
            background-color: #e8f0fe;
            border-radius: 12px;
            padding: 20px;
            margin-top: 20px;
        }

        .wallet-details h3 {
            color: #4a6fa5;
            margin-bottom: 15px;
            font-size: 20px;
        }

        /* 成功页面 */
        .success-container {
            max-width: 800px;
            margin: 0 auto;
            text-align: center;
            padding: 40px 20px;
        }

        .success-title {
            font-size: 32px;
            font-weight: bold;
            margin-bottom: 20px;
            color: #000;
        }

        .success-desc {
            font-size: 18px;
            color: #666;
            margin-bottom: 30px;
            line-height: 1.6;
        }

        .registration-id {
            background-color: #000;
            color: #fff;
            padding: 20px;
            border-radius: 12px;
            margin-bottom: 30px;
        }

        .registration-id h4 {
            font-size: 16px;
            opacity: 0.7;
            margin-bottom: 10px;
        }

        .registration-id .id {
            font-size: 28px;
            font-weight: bold;
            letter-spacing: 2px;
        }

        .next-steps {
            background-color: #d4edda;
            border: 2px solid #28a745;
            border-radius: 12px;
            padding: 20px;
            text-align: left;
        }

        .next-steps h3 {
            color: #155724;
            font-size: 20px;
            margin-bottom: 15px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .next-steps ul {
            list-style: none;
            padding-left: 0;
        }

        .next-steps li {
            font-size: 16px;
            margin-bottom: 10px;
            color: #155724;
        }

        /* 进度条 */
        .progress-bar {
            width: 100%;
            height: 8px;
            background-color: #ddd;
            border-radius: 4px;
            margin: 20px 0;
            position: relative;
        }

        .progress-dot {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background-color: #fff;
            border: 2px solid #ddd;
        }

        .progress-dot.active {
            background-color: #fff;
            border-color: #000;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .form-row {
                grid-template-columns: 1fr;
                gap: 15px;
            }

            .race-options {
                grid-template-columns: 1fr;
            }

            .step-text {
                font-size: 10px;
            }

            .step-circle {
                width: 30px;
                height: 30px;
                font-size: 12px;
            }

            .btn-group {
                flex-direction: column;
            }

            .btn {
                width: 100%;
            }
        }

        /* 步骤切换 */
        .step-content {
            display: none;
        }

        .step-content.active {
            display: block;
        }