:root {
            --rfq3-primary: #ff6600;
            --rfq3-secondary: #2c3e50;
            --rfq3-accent: #3498db;
            --rfq3-bg-light: #f4f7f6;
            --rfq3-text-dark: #1a1a1a;
            --rfq3-text-gray: #555555;
            --rfq3-white: #ffffff;
            --rfq3-shadow: 0 10px 30px rgba(0,0,0,0.08);
            --rfq3-radius: 16px;
        }

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--rfq3-bg-light);
            color: var(--rfq3-text-dark);
            line-height: 1.7;
            overflow-x: hidden;
            word-break: keep-all;
        }

        /* 导航栏样式 */
        .rfq3-header {
            position: fixed;
            top: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 15px rgba(0,0,0,0.05);
        }

        .rfq3-nav-container {
            max-width: 1400px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding: 12px 24px;
        }

        .rfq3-logo {
            flex: 0 0 auto;
            min-width: 0;
        }

        .rfq3-logo img {
            height: 45px;
            width: auto;
            display: block;
        }

        .rfq3-nav-list {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 16px;
            min-width: 0;
        }

        .rfq3-nav-item a {
            text-decoration: none;
            color: var(--rfq3-secondary);
            font-weight: 500;
            font-size: 0.95rem;
            transition: color 0.3s;
            padding: 8px 4px;
            position: relative;
        }

        .rfq3-nav-item a:hover, .rfq3-nav-item a.rfq3-active {
            color: var(--rfq3-primary);
        }

        .rfq3-nav-item a.rfq3-active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--rfq3-primary);
            border-radius: 2px;
        }

        /* Hero下载区 */
        .rfq3-hero {
            padding: 160px 24px 80px;
            background: linear-gradient(135deg, #ffffff 0%, #eef2f3 100%);
            overflow: hidden;
        }

        .rfq3-hero-wrapper {
            max-width: 1300px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 48px;
        }

        .rfq3-hero-content {
            flex: 1 1 500px;
            min-width: 0;
            word-break: break-word;
        }

        .rfq3-hero-title {
            font-size: clamp(2rem, 4vw + 0.5rem, 3.5rem);
            line-height: 1.2;
            color: var(--rfq3-secondary);
            margin-bottom: 24px;
            font-weight: 800;
        }

        .rfq3-hero-subtitle {
            font-size: clamp(1rem, 1.2vw + 0.2rem, 1.4rem);
            color: var(--rfq3-text-gray);
            margin-bottom: 40px;
            max-width: 600px;
        }

        .rfq3-download-card {
            background: var(--rfq3-white);
            padding: 32px;
            border-radius: var(--rfq3-radius);
            box-shadow: var(--rfq3-shadow);
            border: 1px solid rgba(255, 102, 0, 0.1);
        }

        .rfq3-btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 24px;
        }

        .rfq3-btn-primary {
            background: linear-gradient(90deg, #ff6600, #ff8c00);
            color: white;
            padding: 16px 32px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: bold;
            font-size: 1.1rem;
            transition: transform 0.3s, box-shadow 0.3s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .rfq3-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(255, 102, 0, 0.3);
        }

        .rfq3-hero-image {
            flex: 1 1 400px;
            min-width: 0;
            position: relative;
        }

        .rfq3-hero-image img {
            width: 100%;
            border-radius: var(--rfq3-radius);
            box-shadow: 0 20px 50px rgba(0,0,0,0.15);
            transition: transform 0.5s;
        }

        .rfq3-hero-image img:hover {
            transform: scale(1.02);
        }

        /* 核心规格引擎 */
        .rfq3-specs {
            padding: 96px 24px;
            background-color: var(--rfq3-white);
        }

        .rfq3-container-wide {
            max-width: 1300px;
            margin: 0 auto;
        }

        .rfq3-section-title {
            text-align: center;
            margin-bottom: 64px;
        }

        .rfq3-section-title h2 {
            font-size: clamp(1.8rem, 3vw, 2.5rem);
            color: var(--rfq3-secondary);
            margin-bottom: 16px;
        }

        .rfq3-spec-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .rfq3-spec-card {
            padding: 40px;
            background: var(--rfq3-bg-light);
            border-radius: var(--rfq3-radius);
            transition: background 0.3s, transform 0.3s;
            border: 1px solid transparent;
        }

        .rfq3-spec-card:hover {
            background: var(--rfq3-white);
            border-color: var(--rfq3-primary);
            transform: translateY(-5px);
            box-shadow: var(--rfq3-shadow);
        }

        .rfq3-spec-card h3 {
            color: var(--rfq3-primary);
            margin-bottom: 16px;
            font-size: 1.4rem;
        }

        .rfq3-spec-list {
            list-style: none;
            color: var(--rfq3-text-gray);
            font-size: 0.95rem;
        }

        .rfq3-spec-list li {
            margin-bottom: 12px;
            padding-left: 20px;
            position: relative;
        }

        .rfq3-spec-list li::before {
            content: '✓';
            position: absolute;
            left: 0;
            color: var(--rfq3-primary);
            font-weight: bold;
        }

        /* 版本安全说明 */
        .rfq3-security {
            padding: 96px 24px;
            background: #1a1a1a;
            color: #ffffff;
        }

        .rfq3-security-wrapper {
            max-width: 1300px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
        }

        .rfq3-security-img {
            flex: 1 1 450px;
            min-width: 0;
        }

        .rfq3-security-img img {
            width: 100%;
            border-radius: var(--rfq3-radius);
            filter: grayscale(20%) brightness(0.9);
        }

        .rfq3-security-text {
            flex: 1 1 450px;
            min-width: 0;
        }

        .rfq3-security-text h2 {
            font-size: 2.2rem;
            margin-bottom: 24px;
            color: var(--rfq3-primary);
        }

        .rfq3-security-text p {
            font-size: 1.1rem;
            line-height: 1.8;
            margin-bottom: 20px;
            color: #cccccc;
        }

        /* 历史版本 */
        .rfq3-archive {
            padding: 96px 24px;
        }

        .rfq3-archive-header {
            max-width: 1300px;
            margin: 0 auto 48px;
            text-align: center;
        }

        .rfq3-archive-header img {
            max-width: 800px;
            width: 100%;
            height: 250px;
            object-fit: cover;
            border-radius: var(--rfq3-radius);
            margin-bottom: 32px;
        }

        .rfq3-archive-table-container {
            max-width: 1000px;
            margin: 0 auto;
            background: white;
            padding: 24px;
            border-radius: var(--rfq3-radius);
            box-shadow: var(--rfq3-shadow);
            overflow-x: auto;
        }

        .rfq3-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }

        .rfq3-table th {
            padding: 16px;
            border-bottom: 2px solid var(--rfq3-bg-light);
            color: var(--rfq3-secondary);
        }

        .rfq3-table td {
            padding: 16px;
            border-bottom: 1px solid #f0f0f0;
        }

        .rfq3-tag {
            background: #e1f5fe;
            color: #039be5;
            padding: 4px 12px;
            border-radius: 4px;
            font-size: 0.8rem;
            font-weight: bold;
        }

        /* 页脚 */
        .rfq3-footer {
            background: #2c3e50;
            color: #ecf0f1;
            padding: 80px 24px 40px;
        }

        .rfq3-footer-grid {
            max-width: 1300px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
            margin-bottom: 64px;
        }

        .rfq3-footer-brand h3 {
            font-size: 1.8rem;
            color: #ff6600;
            margin-bottom: 20px;
        }

        .rfq3-footer-links h4 {
            margin-bottom: 24px;
            font-size: 1.1rem;
            border-left: 4px solid var(--rfq3-primary);
            padding-left: 12px;
        }

        .rfq3-footer-links ul {
            list-style: none;
        }

        .rfq3-footer-links li {
            margin-bottom: 12px;
        }

        .rfq3-footer-links a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
        }

        .rfq3-footer-links a:hover {
            color: var(--rfq3-primary);
        }

        .rfq3-footer-bottom {
            max-width: 1300px;
            margin: 0 auto;
            padding-top: 40px;
            border-top: 1px solid rgba(255,255,255,0.1);
            text-align: center;
            font-size: 0.9rem;
            color: #95a5a6;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .rfq3-nav-container {
                flex-direction: column;
                padding: 16px;
            }
            .rfq3-nav-list {
                margin-top: 16px;
                justify-content: center;
                gap: 8px 16px;
            }
            .rfq3-hero {
                padding-top: 200px;
                text-align: center;
            }
            .rfq3-hero-wrapper {
                flex-direction: column;
            }
            .rfq3-btn-group {
                justify-content: center;
            }
            .rfq3-security-wrapper {
                flex-direction: column-reverse;
            }
            .rfq3-hero-image {
                width: 100%;
            }
        }