:root {
            --otis-blue: #0057B8;
            --dark: #1A1A1A;
            --text-gray: #555555;
            --light-gray: #EEEEEE;
            --border-gray: #D8D8D8;
            --white: #FFFFFF;
            --hover-blue: #004899;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: Arial, Helvetica, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            color: var(--dark);
            background-color: #fdfdfd;
            line-height: 1.7;
        }
        .container {
            max-width: 1240px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 顶部横幅 */
        .page-banner {
            padding: 80px 0;
            background-color: #f7f9fc;
            text-align: center;
            margin-bottom: 60px;
        }
        .page-banner h1 {
            font-size: 40px;
            font-weight: 600;
            color: var(--dark);
            margin-bottom: 16px;
        }
        .page-banner p {
            font-size: 18px;
            color: var(--text-gray);
            max-width: 800px;
            margin: 0 auto;
        }

        /* 通用区块 */
        .section {
            margin-bottom: 70px;
        }
        .section-title {
            font-size: 26px;
            font-weight: 600;
            margin-bottom: 28px;
            padding-bottom: 12px;
            border-bottom: 1px solid var(--border-gray);
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-gray);
            margin-bottom: 30px;
        }

        /* 合作优势布局 */
        .benefit-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(380px, 1fr));
            gap: 24px;
        }
        .benefit-item {
            padding: 24px;
            border: 1px solid var(--border-gray);
            background: var(--white);
            transition: border-color 0.3s ease;
        }
        .benefit-item:hover {
            border-color: var(--otis-blue);
        }
        .benefit-item h3 {
            font-size: 18px;
            color: var(--otis-blue);
            margin-bottom: 12px;
        }
        .benefit-item p {
            color: var(--text-gray);
            font-size: 15px;
        }

        /* 两种合作模式卡片 */
        .model-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
        }
        .model-card {
            padding: 30px;
            border: 1px solid var(--border-gray);
            background: var(--white);
        }
        .model-card h3 {
            font-size: 22px;
            margin-bottom: 20px;
            color: var(--dark);
        }
        .model-card ul {
            list-style: none;
        }
        .model-card li {
            padding: 10px 0;
            border-bottom: 1px solid var(--light-gray);
            font-size: 15px;
        }
        .model-card li:last-child {
            border-bottom: none;
        }

        /* 申请流程 */
        .process-list {
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 20px;
        }
        .process-item {
            flex: 1;
            min-width: 200px;
            text-align: center;
            padding: 24px;
            border: 1px solid var(--border-gray);
        }
        .process-num {
            display: inline-block;
            width: 36px;
            height: 36px;
            line-height: 36px;
            border-radius: 50%;
            background: var(--otis-blue);
            color: #fff;
            font-weight: bold;
            margin-bottom: 12px;
        }

        /* 表单样式 */
        .apply-form-wrap {
            padding: 40px;
            background: #f7f9fc;
            border-radius: 4px;
        }
        .form-row {
            margin-bottom: 20px;
        }
        .form-row label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
        }
        .form-row input,
        .form-row select,
        .form-row textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-gray);
            font-size: 15px;
            border-radius: 2px;
        }
        .submit-btn {
            padding: 14px 36px;
            background: var(--otis-blue);
            color: #fff;
            border: none;
            font-size: 16px;
            cursor: pointer;
            transition: background 0.3s ease;
        }
        .submit-btn:hover {
            background: var(--hover-blue);
        }
        .download-btn {
            padding: 12px 28px;
            background: #fff;
            color: var(--otis-blue);
            border: 1px solid var(--otis-blue);
            font-size: 15px;
            cursor: pointer;
            margin-left: 16px;
            transition: all 0.3s;
        }
        .download-btn:hover {
            background: var(--otis-blue);
            color: white;
        }

        /* 邀约区域 */
        .final-invite {
            text-align: center;
            padding: 50px 20px;
            margin: 40px 0;
            border-top: 1px solid var(--border-gray);
            border-bottom: 1px solid var(--border-gray);
        }
        .final-invite h2 {
            margin-bottom: 16px;
            font-size: 28px;
        }
        .final-invite p {
            max-width: 750px;
            margin: 0 auto;
            color: var(--text-gray);
            font-size: 17px;
        }

        /* 弹窗样式 */
        .modal-mask {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.5);
            display: none;
            align-items: center;
            justify-content: center;
            z-index: 9999;
        }
        .modal-box {
            background: white;
            padding: 40px;
            border-radius: 6px;
            text-align: center;
            min-width: 360px;
        }
        .modal-box h3 {
            color: #28a745;
            margin-bottom: 16px;
        }
        .modal-close {
            margin-top: 20px;
            padding: 10px 26px;
            background: var(--otis-blue);
            color: white;
            border: none;
            cursor: pointer;
        }

        /* 移动端适配 */
        @media (max-width: 992px) {
            .model-wrap {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 768px) {
            .page-banner h1 {
                font-size: 30px;
            }
            .benefit-list {
                grid-template-columns: 1fr;
            }
            .process-list {
                flex-direction: column;
            }
            .apply-form-wrap {
                padding: 24px;
            }
            .download-btn {
                margin: 12px 0 0 0;
                display: block;
            }
        }