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

        body {
            font-family: 'Microsoft YaHei', Arial, sans-serif;
            line-height: 1.6;
            color: #333;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        }

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

        .j990-header {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
        }

        .j990-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }

        .j990-logo {
            display: flex;
            align-items: center;
            font-size: 24px;
            font-weight: bold;
            color: #4a5568;
        }

        .j990-logo img {
            height: 40px;
            margin-right: 10px;
        }

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

        .j990-nav-link {
            text-decoration: none;
            color: #4a5568;
            font-weight: 500;
            transition: all 0.3s ease;
            padding: 8px 16px;
            border-radius: 25px;
        }

        .j990-nav-link:hover {
            color: #667eea;
            background: rgba(102, 126, 234, 0.1);
            transform: translateY(-2px);
        }

        .j990-hero {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 120px 0 80px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .j990-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="40" r="1" fill="rgba(255,255,255,0.1)"/><circle cx="40" cy="80" r="1.5" fill="rgba(255,255,255,0.1)"/></svg>');
            animation: j990-float 20s infinite linear;
        }

        @keyframes j990-float {
            0% { transform: translateY(0px); }
            100% { transform: translateY(-100px); }
        }

        .j990-hero-content {
            position: relative;
            z-index: 2;
        }

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

        .j990-subtitle {
            font-size: 1.3rem;
            margin-bottom: 40px;
            opacity: 0.9;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

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

        .j990-btn-primary {
            background: linear-gradient(45deg, #ff6b6b, #ee5a24);
            color: white;
            padding: 15px 35px;
            border: none;
            border-radius: 50px;
            font-size: 1.1rem;
            font-weight: 600;
            text-decoration: none;
            display: inline-block;
            transition: all 0.3s ease;
            box-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);
        }

        .j990-btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(255, 107, 107, 0.6);
        }

        .j990-btn-secondary {
            background: rgba(255, 255, 255, 0.2);
            color: white;
            padding: 15px 35px;
            border: 2px solid rgba(255, 255, 255, 0.3);
            border-radius: 50px;
            font-size: 1.1rem;
            font-weight: 600;
            text-decoration: none;
            display: inline-block;
            transition: all 0.3s ease;
            backdrop-filter: blur(10px);
        }

        .j990-btn-secondary:hover {
            background: rgba(255, 255, 255, 0.3);
            transform: translateY(-3px);
        }

        .j990-features {
            background: white;
            padding: 80px 0;
        }

        .j990-section-title {
            text-align: center;
            font-size: 2.5rem;
            font-weight: 700;
            color: #2d3748;
            margin-bottom: 20px;
        }

        .j990-section-subtitle {
            text-align: center;
            font-size: 1.2rem;
            color: #718096;
            margin-bottom: 60px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        .j990-features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 40px;
            margin-top: 60px;
        }

        .j990-feature-card {
            background: white;
            padding: 40px 30px;
            border-radius: 20px;
            text-align: center;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
            border: 1px solid #e2e8f0;
        }

        .j990-feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
        }

        .j990-feature-icon {
            width: 80px;
            height: 80px;
            background: linear-gradient(135deg, #667eea, #764ba2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 2rem;
            color: white;
        }

        .j990-feature-title {
            font-size: 1.5rem;
            font-weight: 600;
            color: #2d3748;
            margin-bottom: 15px;
        }

        .j990-feature-desc {
            color: #718096;
            line-height: 1.6;
        }

        .j990-about {
            background: linear-gradient(135deg, #f7fafc 0%, #edf2f7 100%);
            padding: 80px 0;
        }

        .j990-about-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .j990-about-text {
            font-size: 1.1rem;
            line-height: 1.8;
            color: #4a5568;
        }

        .j990-about-image {
            text-align: center;
        }

        .j990-stats {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }

        .j990-stat-item {
            text-align: center;
            padding: 30px 20px;
            background: white;
            border-radius: 15px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
        }

        .j990-stat-number {
            font-size: 2.5rem;
            font-weight: 700;
            color: #667eea;
            display: block;
        }

        .j990-stat-label {
            color: #718096;
            font-weight: 500;
            margin-top: 5px;
        }

        .j990-cta-section {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 80px 0;
            text-align: center;
        }

        .j990-cta-title {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .j990-cta-desc {
            font-size: 1.2rem;
            margin-bottom: 40px;
            opacity: 0.9;
        }

        .j990-footer {
            background: #2d3748;
            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;
            font-weight: 600;
            margin-bottom: 20px;
            color: #e2e8f0;
        }

        .j990-footer-section p,
        .j990-footer-section a {
            color: #a0aec0;
            text-decoration: none;
            line-height: 1.8;
        }

        .j990-footer-section a:hover {
            color: #667eea;
        }

        .j990-footer-bottom {
            border-top: 1px solid #4a5568;
            padding-top: 30px;
            text-align: center;
            color: #a0aec0;
        }

        @media (max-width: 768px) {
            .j990-nav-menu {
                display: none;
            }

            .j990-main-title {
                font-size: 2.5rem;
            }

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

            .j990-about-content {
                grid-template-columns: 1fr;
                gap: 40px;
            }

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