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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
            line-height: 1.6;
            color: #333;
            background: #fff;
        }

        .j990-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            z-index: 1000;
            border-bottom: 1px solid rgba(0, 0, 0, 0.1);
        }

        .j990-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            height: 70px;
        }

        .j990-logo img {
            height: 40px;
            width: auto;
        }

        .j990-menu-toggle {
            display: none;
            flex-direction: column;
            background: none;
            border: none;
            cursor: pointer;
            padding: 5px;
        }

        .j990-menu-toggle span {
            width: 25px;
            height: 3px;
            background: #333;
            margin: 3px 0;
            transition: 0.3s;
        }

        .j990-nav-menu {
            display: flex;
            list-style: none;
            gap: 30px;
        }

        .j990-nav-menu a {
            text-decoration: none;
            color: #333;
            font-weight: 500;
            transition: color 0.3s;
            position: relative;
        }

        .j990-nav-menu a:hover {
            color: #007bff;
        }

        .j990-nav-menu a.active::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            right: 0;
            height: 2px;
            background: #007bff;
        }

        .j990-nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 999;
        }

        .j990-hero {
            position: relative;
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            color: white;
            overflow: hidden;
        }

        .j990-hero-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            z-index: -2;
        }

        .j990-hero-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(0, 123, 255, 0.8), rgba(40, 167, 69, 0.8));
            z-index: -1;
        }

        .j990-hero-content {
            max-width: 800px;
            padding: 0 20px;
            animation: fadeInUp 1s ease-out;
        }

        .j990-hero h1 {
            font-size: 3.5rem;
            font-weight: 700;
            margin-bottom: 20px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
        }

        .j990-hero p {
            font-size: 1.3rem;
            margin-bottom: 40px;
            opacity: 0.95;
        }

        .j990-cta-buttons {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .j990-btn {
            padding: 15px 30px;
            border: none;
            border-radius: 50px;
            font-size: 1.1rem;
            font-weight: 600;
            text-decoration: none;
            display: inline-block;
            transition: all 0.3s;
            cursor: pointer;
        }

        .j990-btn-primary {
            background: #fff;
            color: #007bff;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
        }

        .j990-btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
        }

        .j990-btn-secondary {
            background: transparent;
            color: #fff;
            border: 2px solid #fff;
        }

        .j990-btn-secondary:hover {
            background: #fff;
            color: #007bff;
        }

        .j990-stats {
            background: #f8f9fa;
            padding: 80px 0;
        }

        .j990-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        .j990-stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            text-align: center;
        }

        .j990-stat-item {
            padding: 30px;
            background: white;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s;
        }

        .j990-stat-item:hover {
            transform: translateY(-5px);
        }

        .j990-stat-number {
            font-size: 3rem;
            font-weight: 700;
            color: #007bff;
            margin-bottom: 10px;
        }

        .j990-stat-label {
            font-size: 1.1rem;
            color: #666;
        }

        .j990-features {
            padding: 100px 0;
            background: white;
        }

        .j990-section-header {
            text-align: center;
            margin-bottom: 80px;
        }

        .j990-section-title {
            font-size: 2.5rem;
            font-weight: 700;
            color: #333;
            margin-bottom: 20px;
        }

        .j990-section-subtitle {
            font-size: 1.2rem;
            color: #666;
            max-width: 600px;
            margin: 0 auto;
        }

        .j990-features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 40px;
        }

        .j990-feature-card {
            padding: 40px;
            background: #f8f9fa;
            border-radius: 20px;
            text-align: center;
            transition: all 0.3s;
            border: 2px solid transparent;
        }

        .j990-feature-card:hover {
            transform: translateY(-10px);
            border-color: #007bff;
            box-shadow: 0 15px 30px rgba(0, 123, 255, 0.1);
        }

        .j990-feature-icon {
            font-size: 3rem;
            margin-bottom: 20px;
            display: block;
        }

        .j990-feature-title {
            font-size: 1.5rem;
            font-weight: 600;
            color: #333;
            margin-bottom: 15px;
        }

        .j990-feature-desc {
            color: #666;
            line-height: 1.7;
        }

        .j990-products {
            padding: 100px 0;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
        }

        .j990-products .j990-section-title,
        .j990-products .j990-section-subtitle {
            color: white;
        }

        .j990-products-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 40px;
        }

        .j990-product-card {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            padding: 40px;
            text-align: center;
            border: 1px solid rgba(255, 255, 255, 0.2);
            transition: transform 0.3s;
        }

        .j990-product-card:hover {
            transform: translateY(-10px);
        }

        .j990-product-name {
            font-size: 1.8rem;
            font-weight: 600;
            margin-bottom: 15px;
        }

        .j990-product-highlight {
            background: rgba(255, 255, 255, 0.2);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.9rem;
            margin-bottom: 20px;
            display: inline-block;
        }

        .j990-product-desc {
            line-height: 1.7;
            opacity: 0.9;
        }

        .j990-scenarios {
            padding: 100px 0;
            background: #f8f9fa;
        }

        .j990-scenarios-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .j990-scenario-card {
            background: white;
            padding: 30px;
            border-radius: 15px;
            text-align: center;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            transition: transform 0.3s;
        }

        .j990-scenario-card:hover {
            transform: translateY(-5px);
        }

        .j990-scenario-icon {
            font-size: 2.5rem;
            margin-bottom: 20px;
            display: block;
        }

        .j990-scenario-title {
            font-size: 1.3rem;
            font-weight: 600;
            color: #333;
            margin-bottom: 15px;
        }

        .j990-scenario-desc {
            color: #666;
            line-height: 1.6;
        }

        .j990-testimonials {
            padding: 100px 0;
            background: white;
        }

        .j990-testimonials-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 30px;
        }

        .j990-testimonial-card {
            background: #f8f9fa;
            padding: 30px;
            border-radius: 15px;
            position: relative;
        }

        .j990-testimonial-content {
            font-style: italic;
            line-height: 1.7;
            margin-bottom: 20px;
            color: #555;
        }

        .j990-testimonial-author {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .j990-testimonial-avatar {
            font-size: 2rem;
        }

        .j990-testimonial-info h4 {
            font-weight: 600;
            color: #333;
        }

        .j990-testimonial-info p {
            color: #666;
            font-size: 0.9rem;
        }

        .j990-testimonial-rating {
            position: absolute;
            top: 20px;
            right: 20px;
            color: #ffc107;
        }

        .j990-download {
            padding: 100px 0;
            background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
            color: white;
            text-align: center;
        }

        .j990-download .j990-section-title,
        .j990-download .j990-section-subtitle {
            color: white;
        }

        .j990-download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-top: 60px;
        }

        .j990-download-card {
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            padding: 30px;
            border: 1px solid rgba(255, 255, 255, 0.2);
            transition: transform 0.3s;
        }

        .j990-download-card:hover {
            transform: translateY(-5px);
        }

        .j990-download-icon {
            font-size: 3rem;
            margin-bottom: 20px;
            display: block;
        }

        .j990-download-platform {
            font-size: 1.5rem;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .j990-download-info {
            margin-bottom: 20px;
            opacity: 0.9;
        }

        .j990-download-btn {
            background: white;
            color: #28a745;
            padding: 12px 25px;
            border-radius: 25px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
            display: inline-block;
        }

        .j990-download-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        }

        .j990-footer {
            background: #2c3e50;
            color: white;
            padding: 60px 0 30px;
        }

        .j990-footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .j990-footer-section h3 {
            font-size: 1.3rem;
            margin-bottom: 20px;
            color: #ecf0f1;
        }

        .j990-footer-section ul {
            list-style: none;
        }

        .j990-footer-section ul li {
            margin-bottom: 10px;
        }

        .j990-footer-section ul li a {
            color: #bdc3c7;
            text-decoration: none;
            transition: color 0.3s;
        }

        .j990-footer-section ul li a:hover {
            color: #3498db;
        }

        .j990-footer-bottom {
            border-top: 1px solid #34495e;
            padding-top: 30px;
            text-align: center;
            color: #95a5a6;
        }

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

        @media (max-width: 768px) {
            .j990-menu-toggle {
                display: flex;
            }

            .j990-nav-menu {
                display: none;
                position: fixed;
                top: 70px;
                left: 0;
                right: 0;
                background: white;
                flex-direction: column;
                padding: 20px;
                box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            }

            .j990-nav-menu.active {
                display: flex;
            }

            .j990-hero h1 {
                font-size: 2.5rem;
            }

            .j990-hero p {
                font-size: 1.1rem;
            }

            .j990-cta-buttons {
                flex-direction: column;
                align-items: center;
            }

            .j990-features-grid,
            .j990-products-grid {
                grid-template-columns: 1fr;
            }

            .j990-stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .j990-section-title {
                font-size: 2rem;
            }
        }

        @media (max-width: 480px) {
            .j990-stats-grid {
                grid-template-columns: 1fr;
            }

            .j990-hero h1 {
                font-size: 2rem;
            }

            .j990-container {
                padding: 0 15px;
            }
        }