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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
            line-height: 1.6;
            color: #333;
            background-color: #f8f9fa;
        }

        /* 导航栏样式 */
        .vjh3-navbar-wrapper {
            background: linear-gradient(135deg, #0088cc 0%, #0073a8 100%);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .vjh3-navbar-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            height: 70px;
        }

        .vjh3-logo-section {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
        }

        .vjh3-logo-img {
            width: 40px;
            height: 40px;
            background-color: white;
            border-radius: 8px;
            padding: 5px;
        }

        .vjh3-logo-text {
            color: white;
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
        }

        .vjh3-nav-menu {
            display: flex;
            gap: 30px;
            align-items: center;
        }

        .vjh3-nav-link {
            color: white;
            text-decoration: none;
            font-size: 15px;
            font-weight: 500;
            transition: all 0.3s ease;
            padding: 8px 12px;
            border-radius: 4px;
        }

        .vjh3-nav-link:hover {
            background-color: rgba(255, 255, 255, 0.2);
            transform: translateY(-2px);
        }

        /* 英雄区域 */
        .vjh3-hero-section {
            background: linear-gradient(135deg, #0088cc 0%, #0073a8 50%, #005a8f 100%);
            color: white;
            padding: 100px 20px;
            text-align: center;
        }

        .vjh3-hero-container {
            max-width: 1000px;
            margin: 0 auto;
        }

        .vjh3-hero-title {
            font-size: 48px;
            font-weight: 800;
            margin-bottom: 20px;
            line-height: 1.2;
            letter-spacing: -1px;
        }

        .vjh3-hero-subtitle {
            font-size: 20px;
            margin-bottom: 30px;
            opacity: 0.95;
            font-weight: 300;
        }

        .vjh3-cta-button-primary {
            display: inline-block;
            background-color: white;
            color: #0088cc;
            padding: 15px 40px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 700;
            font-size: 16px;
            margin: 10px;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
            border: 2px solid white;
        }

        .vjh3-cta-button-primary:hover {
            background-color: #f0f0f0;
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
        }

        .vjh3-cta-button-secondary {
            display: inline-block;
            background-color: transparent;
            color: white;
            padding: 15px 40px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 700;
            font-size: 16px;
            margin: 10px;
            transition: all 0.3s ease;
            border: 2px solid white;
        }

        .vjh3-cta-button-secondary:hover {
            background-color: rgba(255, 255, 255, 0.1);
            transform: translateY(-3px);
        }

        /* 特性区域 */
        .vjh3-features-section {
            padding: 80px 20px;
            background-color: white;
        }

        .vjh3-section-container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .vjh3-section-title {
            font-size: 36px;
            font-weight: 800;
            text-align: center;
            margin-bottom: 60px;
            color: #222;
            position: relative;
            padding-bottom: 20px;
        }

        .vjh3-section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, #0088cc, #0073a8);
            border-radius: 2px;
        }

        .vjh3-features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .vjh3-feature-card {
            background: #f8f9fa;
            padding: 40px 30px;
            border-radius: 12px;
            text-align: center;
            transition: all 0.3s ease;
            border: 2px solid #e0e0e0;
        }

        .vjh3-feature-card:hover {
            background: white;
            border-color: #0088cc;
            box-shadow: 0 10px 30px rgba(0, 136, 204, 0.15);
            transform: translateY(-5px);
        }

        .vjh3-feature-icon {
            font-size: 48px;
            margin-bottom: 20px;
            height: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .vjh3-feature-title {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 15px;
            color: #222;
        }

        .vjh3-feature-desc {
            font-size: 15px;
            color: #666;
            line-height: 1.8;
        }

        /* 关键词密度部分 */
        .vjh3-intro-section {
            padding: 80px 20px;
            background: linear-gradient(135deg, #f0f4f9 0%, #ffffff 100%);
        }

        .vjh3-intro-content {
            max-width: 900px;
            margin: 0 auto;
        }

        .vjh3-intro-title {
            font-size: 32px;
            font-weight: 800;
            color: #222;
            margin-bottom: 30px;
        }

        .vjh3-intro-text {
            font-size: 16px;
            color: #555;
            line-height: 1.9;
            margin-bottom: 20px;
            text-align: justify;
        }

        .vjh3-highlight-text {
            color: #0088cc;
            font-weight: 600;
        }

        /* 下载区域 */
        .vjh3-download-section {
            padding: 80px 20px;
            background-color: white;
        }

        .vjh3-download-container {
            max-width: 1000px;
            margin: 0 auto;
        }

        .vjh3-download-title {
            font-size: 36px;
            font-weight: 800;
            text-align: center;
            margin-bottom: 50px;
            color: #222;
        }

        .vjh3-platform-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 30px;
            margin-bottom: 40px;
        }

        .vjh3-platform-card {
            background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
            padding: 40px 30px;
            border-radius: 12px;
            text-align: center;
            border: 2px solid #e0e0e0;
            transition: all 0.3s ease;
        }

        .vjh3-platform-card:hover {
            border-color: #0088cc;
            box-shadow: 0 8px 25px rgba(0, 136, 204, 0.2);
            transform: translateY(-8px);
        }

        .vjh3-platform-icon {
            font-size: 56px;
            margin-bottom: 20px;
        }

        .vjh3-platform-name {
            font-size: 18px;
            font-weight: 700;
            color: #222;
            margin-bottom: 15px;
        }

        .vjh3-download-btn {
            display: inline-block;
            background-color: #0088cc;
            color: white;
            padding: 12px 30px;
            border-radius: 25px;
            text-decoration: none;
            font-weight: 600;
            font-size: 14px;
            transition: all 0.3s ease;
            border: 2px solid #0088cc;
        }

        .vjh3-download-btn:hover {
            background-color: #0073a8;
            border-color: #0073a8;
            transform: scale(1.05);
        }

        /* 安全隐私区域 */
        .vjh3-security-section {
            padding: 80px 20px;
            background: linear-gradient(135deg, #0088cc 0%, #0073a8 100%);
            color: white;
        }

        .vjh3-security-container {
            max-width: 1000px;
            margin: 0 auto;
        }

        .vjh3-security-title {
            font-size: 36px;
            font-weight: 800;
            text-align: center;
            margin-bottom: 40px;
        }

        .vjh3-security-features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 40px;
        }

        .vjh3-security-item {
            background: rgba(255, 255, 255, 0.1);
            padding: 30px;
            border-radius: 10px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(10px);
        }

        .vjh3-security-item-title {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .vjh3-security-item-desc {
            font-size: 14px;
            opacity: 0.9;
            line-height: 1.7;
        }

        /* FAQ区域 */
        .vjh3-faq-section {
            padding: 80px 20px;
            background-color: #f8f9fa;
        }

        .vjh3-faq-container {
            max-width: 800px;
            margin: 0 auto;
        }

        .vjh3-faq-title {
            font-size: 36px;
            font-weight: 800;
            text-align: center;
            margin-bottom: 50px;
            color: #222;
        }

        .vjh3-faq-item {
            background: white;
            padding: 30px;
            margin-bottom: 20px;
            border-radius: 10px;
            border-left: 4px solid #0088cc;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .vjh3-faq-item:hover {
            box-shadow: 0 5px 15px rgba(0, 136, 204, 0.1);
        }

        .vjh3-faq-question {
            font-size: 16px;
            font-weight: 700;
            color: #222;
            margin-bottom: 12px;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .vjh3-faq-answer {
            font-size: 15px;
            color: #666;
            line-height: 1.8;
            display: none;
        }

        .vjh3-faq-item.active .vjh3-faq-answer {
            display: block;
        }

        .vjh3-faq-toggle {
            font-size: 20px;
            color: #0088cc;
            font-weight: bold;
            transition: transform 0.3s ease;
        }

        .vjh3-faq-item.active .vjh3-faq-toggle {
            transform: rotate(180deg);
        }

        /* 联系区域 */
        .vjh3-contact-section {
            padding: 80px 20px;
            background: white;
        }

        .vjh3-contact-container {
            max-width: 800px;
            margin: 0 auto;
            text-align: center;
        }

        .vjh3-contact-title {
            font-size: 36px;
            font-weight: 800;
            margin-bottom: 30px;
            color: #222;
        }

        .vjh3-contact-desc {
            font-size: 16px;
            color: #666;
            margin-bottom: 40px;
            line-height: 1.8;
        }

        .vjh3-contact-btn {
            display: inline-block;
            background: linear-gradient(135deg, #0088cc 0%, #0073a8 100%);
            color: white;
            padding: 18px 50px;
            border-radius: 50px;
            text-decoration: none;
            font-weight: 700;
            font-size: 16px;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(0, 136, 204, 0.4);
            border: none;
            cursor: pointer;
        }

        .vjh3-contact-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 25px rgba(0, 136, 204, 0.6);
        }

        /* 页脚 */
        .vjh3-footer-wrapper {
            background: #1a1a1a;
            color: #ccc;
            padding: 60px 20px 30px;
        }

        .vjh3-footer-container {
            max-width: 1200px;
            margin: 0 auto;
        }

        .vjh3-footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .vjh3-footer-section-title {
            font-size: 16px;
            font-weight: 700;
            color: white;
            margin-bottom: 20px;
        }

        .vjh3-footer-link {
            display: block;
            color: #ccc;
            text-decoration: none;
            margin-bottom: 12px;
            font-size: 14px;
            transition: all 0.3s ease;
        }

        .vjh3-footer-link:hover {
            color: #0088cc;
            padding-left: 5px;
        }

        .vjh3-footer-divider {
            border-top: 1px solid #333;
            padding-top: 30px;
            margin-top: 40px;
        }

        .vjh3-footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .vjh3-footer-copyright {
            font-size: 14px;
            color: #999;
        }

        .vjh3-footer-socials {
            display: flex;
            gap: 20px;
        }

        .vjh3-social-icon {
            width: 35px;
            height: 35px;
            background-color: #333;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #0088cc;
            text-decoration: none;
            transition: all 0.3s ease;
            font-size: 16px;
        }

        .vjh3-social-icon:hover {
            background-color: #0088cc;
            color: white;
            transform: translateY(-3px);
        }

        /* 响应式设计 */
        @media (max-width: 768px) {
            .vjh3-navbar-container {
                height: 60px;
                padding: 0 15px;
            }

            .vjh3-nav-menu {
                gap: 15px;
            }

            .vjh3-nav-link {
                font-size: 13px;
                padding: 6px 8px;
            }

            .vjh3-hero-title {
                font-size: 32px;
            }

            .vjh3-hero-subtitle {
                font-size: 16px;
            }

            .vjh3-section-title,
            .vjh3-download-title,
            .vjh3-faq-title,
            .vjh3-security-title,
            .vjh3-contact-title {
                font-size: 28px;
            }

            .vjh3-features-grid,
            .vjh3-platform-grid,
            .vjh3-security-features {
                gap: 20px;
            }

            .vjh3-feature-card,
            .vjh3-platform-card,
            .vjh3-security-item {
                padding: 25px 20px;
            }

            .vjh3-footer-content {
                gap: 30px;
            }

            .vjh3-footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 480px) {
            .vjh3-hero-title {
                font-size: 24px;
            }

            .vjh3-hero-subtitle {
                font-size: 14px;
            }

            .vjh3-section-title,
            .vjh3-download-title,
            .vjh3-faq-title,
            .vjh3-security-title,
            .vjh3-contact-title {
                font-size: 24px;
            }

            .vjh3-cta-button-primary,
            .vjh3-cta-button-secondary {
                padding: 12px 25px;
                font-size: 14px;
                display: block;
                width: 100%;
                margin: 10px 0;
            }

            .vjh3-nav-menu {
                flex-direction: column;
                gap: 10px;
                display: none;
            }

            .vjh3-hero-section,
            .vjh3-features-section,
            .vjh3-download-section,
            .vjh3-security-section,
            .vjh3-faq-section,
            .vjh3-contact-section {
                padding: 50px 15px;
            }
        }

        /* 动画 */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .vjh3-feature-card,
        .vjh3-platform-card,
        .vjh3-security-item {
            animation: fadeInUp 0.6s ease-out forwards;
        }

        .vjh3-feature-card:nth-child(1) { animation-delay: 0.1s; }
        .vjh3-feature-card:nth-child(2) { animation-delay: 0.2s; }
        .vjh3-feature-card:nth-child(3) { animation-delay: 0.3s; }
        .vjh3-feature-card:nth-child(4) { animation-delay: 0.4s; }