:root {
            --rfq3-primary: #0066cc;
            --rfq3-secondary: #f39c12;
            --rfq3-accent: #00d4ff;
            --rfq3-dark: #1a1a2e;
            --rfq3-light: #f8f9fa;
            --rfq3-text: #333333;
            --rfq3-gray: #6c757d;
            --rfq3-bg-gradient: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
            --rfq3-container-width: 1100px;
            --rfq3-spacing: 8px;
        }

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

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

        /* 导航栏设计 */
        .rfq3-navbar {
            position: fixed;
            top: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            z-index: 1000;
            box-shadow: 0 2px 15px rgba(0,0,0,0.05);
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
        }

        .rfq3-nav-container {
            width: 100%;
            max-width: 1400px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 12px 24px;
        }

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

        .rfq3-logo img {
            height: 40px;
            width: auto;
            display: block;
        }

        .rfq3-menu {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 4px;
        }

        .rfq3-menu li {
            min-width: 0;
        }

        .rfq3-menu a {
            text-decoration: none;
            color: var(--rfq3-dark);
            font-weight: 500;
            padding: 8px 12px;
            border-radius: 6px;
            transition: all 0.3s ease;
            font-size: 0.95rem;
            display: block;
        }

        .rfq3-menu a:hover {
            color: var(--rfq3-primary);
            background: rgba(0, 102, 204, 0.05);
        }

        .rfq3-menu a.active {
            color: #white;
            background: var(--rfq3-primary);
            color: #ffffff;
        }

        /* Hero 区：对角线分割布局 */
        .rfq3-hero {
            position: relative;
            padding: 160px 24px 100px;
            background: var(--rfq3-dark);
            color: #ffffff;
            clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
        }

        .rfq3-hero-content {
            max-width: var(--rfq3-container-width);
            width: 100%;
            text-align: center;
            z-index: 2;
        }

        .rfq3-hero-title {
            font-size: clamp(2rem, 5vw + 1rem, 3.5rem);
            font-weight: 800;
            margin-bottom: 24px;
            line-height: 1.2;
            word-break: keep-all;
        }

        .rfq3-hero-subtitle {
            font-size: clamp(1rem, 2vw + 0.5rem, 1.3rem);
            color: rgba(255, 255, 255, 0.8);
            max-width: 800px;
            margin: 0 auto 40px;
        }

        /* 教程主体布局 */
        .rfq3-main {
            max-width: var(--rfq3-container-width);
            margin: 64px auto;
            padding: 0 24px;
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
        }

        /* 章节设计 */
        .rfq3-section {
            width: 100%;
            background: #ffffff;
            border-radius: 16px;
            padding: 48px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.03);
            margin-bottom: 48px;
            border: 1px solid rgba(0,0,0,0.05);
            min-width: 0;
        }

        .rfq3-section-tag {
            display: inline-block;
            background: rgba(0, 102, 204, 0.1);
            color: var(--rfq3-primary);
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 700;
            margin-bottom: 16px;
            text-transform: uppercase;
        }

        .rfq3-section h2 {
            font-size: 2rem;
            margin-bottom: 24px;
            color: var(--rfq3-dark);
            border-left: 6px solid var(--rfq3-secondary);
            padding-left: 20px;
        }

        .rfq3-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 24px;
            margin-top: 32px;
        }

        .rfq3-card {
            background: var(--rfq3-light);
            padding: 32px;
            border-radius: 12px;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            border-top: 4px solid transparent;
        }

        .rfq3-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
            border-top-color: var(--rfq3-primary);
        }

        .rfq3-card h3 {
            margin-bottom: 16px;
            color: var(--rfq3-primary);
        }

        /* 步骤列表样式 */
        .rfq3-steps {
            list-style: none;
            margin-top: 24px;
        }

        .rfq3-step-item {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            margin-bottom: 32px;
            padding-bottom: 32px;
            border-bottom: 1px dashed #ddd;
        }

        .rfq3-step-number {
            flex: 0 0 50px;
            height: 50px;
            background: var(--rfq3-dark);
            color: #white;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            font-weight: 800;
            color: #fff;
            font-size: 1.2rem;
        }

        .rfq3-step-body {
            flex: 1;
            min-width: 0;
        }

        .rfq3-step-body h4 {
            font-size: 1.25rem;
            margin-bottom: 8px;
        }

        /* 动态区块样式 */
        .rfq3-dynamic-section {
            background: linear-gradient(to right, #2c3e50, #000000);
            color: #fff;
            padding: 80px 24px;
            text-align: center;
            border-radius: 24px;
            margin: 64px 24px;
        }

        /* 页脚设计 */
        .rfq3-footer {
            background: var(--rfq3-dark);
            color: #ffffff;
            padding: 64px 24px;
            margin-top: 96px;
        }

        .rfq3-footer-grid {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 48px;
        }

        .rfq3-brand-text {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--rfq3-secondary);
            margin-bottom: 16px;
        }

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

        .rfq3-footer-links li {
            margin-bottom: 8px;
        }

        .rfq3-footer-links a {
            color: rgba(255,255,255,0.6);
            text-decoration: none;
            transition: color 0.3s;
        }

        .rfq3-footer-links a:hover {
            color: #fff;
        }

        /* 响应式适配 */
        @media (max-width: 768px) {
            .rfq3-navbar {
                position: relative;
            }
            .rfq3-nav-container {
                flex-direction: column;
                padding: 16px;
            }
            .rfq3-menu {
                justify-content: center;
                margin-top: 16px;
            }
            .rfq3-hero {
                padding: 80px 24px 60px;
                clip-path: none;
            }
            .rfq3-section {
                padding: 24px;
            }
        }