:root {
            --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            --secondary-gradient: linear-gradient(45deg, #f7931a 0%, #ff9500 100%);
            --accent-color: #667eea;
            --text-dark: #333;
            --text-light: #fff;
            --bg-light: #f8f9fa;
        }
        
        .modern-navbar {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
            padding: 1rem 0;
            position: fixed;
            width: 100%;
            top: 0;
            z-index: 1000;
            transition: all 0.3s ease;
        }
        
        .modern-navbar.scrolled {
            padding: 0.5rem 0;
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.15);
        }
        
        .modern-nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 2rem;
        }
        
        .modern-logo {
            font-size: 2rem;
            font-weight: 800;
            background: var(--secondary-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-decoration: none;
        }
        
        .modern-nav-links {
            display: flex;
            list-style: none;
            gap: 2rem;
        }
        
        .modern-nav-links a {
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 600;
            position: relative;
            transition: all 0.3s ease;
        }
        
        .modern-nav-links a:hover {
            color: var(--accent-color);
        }
        
        .modern-hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            color: var(--text-light);
            background: var(--primary-gradient);
            padding: 2rem;
            position: relative;
            overflow: hidden;
        }
        
        .modern-hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
        }
        
        .modern-hero h1 {
            font-size: 4rem;
            margin-bottom: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
        }
        
        .modern-hero p {
            font-size: 1.5rem;
            margin-bottom: 2.5rem;
            opacity: 0.9;
        }
        
        .modern-hero-buttons {
            display: flex;
            gap: 1.5rem;
            justify-content: center;
            flex-wrap: wrap;
        }
        
        .modern-btn {
            padding: 1rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            text-decoration: none;
            cursor: pointer;
            transition: all 0.3s ease;
            border: none;
            font-size: 1.1rem;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .modern-btn-primary {
            background: var(--text-light);
            color: var(--accent-color);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
        }
        
        .modern-btn-primary:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
        }
        
        .modern-btn-secondary {
            background: transparent;
            color: var(--text-light);
            border: 2px solid var(--text-light);
        }
        
        .modern-btn-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-5px);
        }
        
        .modern-features {
            padding: 6rem 2rem;
            background: var(--bg-light);
        }
        
        .modern-section-title {
            text-align: center;
            font-size: 3rem;
            margin-bottom: 1.5rem;
            color: var(--text-dark);
        }
        
        .modern-section-subtitle {
            text-align: center;
            font-size: 1.3rem;
            color: #666;
            max-width: 700px;
            margin: 0 auto 4rem;
        }
        
        .modern-features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 2.5rem;
        }
        
        .modern-feature-card {
            background: var(--text-light);
            padding: 2.5rem;
            border-radius: 20px;
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.08);
            text-align: center;
            transition: all 0.4s ease;
            transform: translateY(0);
        }
        
        .modern-feature-card:hover {
            transform: translateY(-15px);
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
        }
        
        .modern-feature-icon {
            width: 90px;
            height: 90px;
            background: var(--primary-gradient);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1.5rem;
            color: var(--text-light);
            font-size: 2.5rem;
        }
        
        .modern-feature-card h3 {
            font-size: 1.8rem;
            margin-bottom: 1rem;
            color: var(--text-dark);
        }
        
        .modern-feature-card p {
            color: #666;
            font-size: 1.1rem;
            line-height: 1.7;
        }
        
        .modern-versions {
            padding: 6rem 2rem;
            background: var(--text-light);
        }
        
        .modern-versions-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
            gap: 2.5rem;
        }
        
        .modern-version-card {
            border: 2px solid #eee;
            border-radius: 20px;
            padding: 3rem;
            text-align: center;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }
        
        .modern-version-card:hover {
            border-color: var(--accent-color);
            box-shadow: 0 20px 40px rgba(102, 126, 234, 0.15);
            transform: translateY(-10px);
        }
        
        .modern-version-card.popular::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px;
            background: var(--secondary-gradient);
        }
        
        .popular-tag {
            position: absolute;
            top: -12px;
            right: 30px;
            background: var(--secondary-gradient);
            color: white;
            padding: 0.5rem 1.5rem;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 600;
            box-shadow: 0 5px 15px rgba(247, 147, 26, 0.3);
        }
        
        .modern-version-card h3 {
            font-size: 2rem;
            margin-bottom: 1rem;
            color: var(--text-dark);
        }
        
        .modern-version-price {
            font-size: 3rem;
            font-weight: 800;
            color: var(--accent-color);
            margin: 1.5rem 0;
        }
        
        .modern-version-features {
            list-style: none;
            margin: 2.5rem 0;
            text-align: left;
        }
        
        .modern-version-features li {
            padding: 0.8rem 0;
            border-bottom: 1px solid #f1f1f1;
            display: flex;
            align-items: center;
        }
        
        .modern-version-features li:last-child {
            border-bottom: none;
        }
        
        .modern-version-features li i {
            color: var(--accent-color);
            margin-right: 1rem;
            font-size: 1.2rem;
        }
        
        .modern-version-card .modern-btn {
            width: 100%;
            margin-top: 1.5rem;
        }
        
        .modern-footer {
            background: var(--text-dark);
            color: var(--text-light);
            padding: 5rem 2rem 2rem;
        }
        
        .modern-footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 3rem;
            max-width: 1200px;
            margin: 0 auto 3rem;
        }
        
        .modern-footer-section h4 {
            font-size: 1.4rem;
            margin-bottom: 1.5rem;
            position: relative;
            padding-bottom: 0.8rem;
        }
        
        .modern-footer-section h4::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 50px;
            height: 3px;
            background: var(--secondary-gradient);
        }
        
        .modern-footer-section ul {
            list-style: none;
        }
        
        .modern-footer-section ul li {
            margin-bottom: 1rem;
        }
        
        .modern-footer-section ul li a {
            color: #aaa;
            text-decoration: none;
            transition: all 0.3s ease;
        }
        
        .modern-footer-section ul li a:hover {
            color: var(--text-light);
            padding-left: 5px;
        }
        
        .modern-copyright {
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #444;
            color: #888;
            font-size: 1rem;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .modern-hero h1 {
                font-size: 2.5rem;
            }
            
            .modern-hero p {
                font-size: 1.2rem;
            }
            
            .modern-hero-buttons {
                flex-direction: column;
                gap: 1rem;
            }
            
            .modern-section-title {
                font-size: 2.2rem;
            }
            
            .modern-nav-links {
                display: none;
            }
            
            .modern-versions-grid {
                grid-template-columns: 1fr;
            }
        }