* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            user-select: none;
        }
        
        html, body {
            width: 100%;
            height: 100%;
            font-family: "Microsoft YaHei", Helvetica, Arial, sans-serif;
            background-color: #010001;
            color: #fff;
            /* 移除 overflow: hidden 允许滚动 */
        }
        
        #universe {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: -1;
        }
        
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 60px;
            background: rgba(0, 0, 0, 0.7);
            backdrop-filter: blur(10px);
            z-index: 100;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 40px;
            transition: all 0.3s ease;
        }
        
        .header.scrolled {
            height: 50px;
            background: rgba(0, 0, 0, 0.9);
        }
        
        .logo {
            height: 30px;
        }
        
        .nav-links a {
            color: #fff;
            text-decoration: none;
            margin-left: 30px;
            font-size: 14px;
            transition: color 0.3s;
        }
        
        .nav-links a:hover {
            color: #3ba0ff;
        }
        
        .hero-section {
            width: 100%;
            height: 100vh;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            text-align: center;
            position: relative;
            /* 移除 overflow: hidden */
        }
        
        .hero-title {
            font-size: 5rem;
            font-weight: bold;
            margin-bottom: 20px;
            opacity: 0;
            transform: translateY(30px);
            animation: fadeInUp 1s forwards 0.5s;
            background: linear-gradient(90deg, #3ba0ff, #00ffcc);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow: 0 0 20px rgba(59, 160, 255, 0.5);
        }
        
        .hero-subtitle {
            font-size: 1.5rem;
            margin-bottom: 40px;
            opacity: 0;
            transform: translateY(30px);
            animation: fadeInUp 1s forwards 0.8s;
            color: #ccc;
        }
        
        .download-btn {
            display: inline-block;
            padding: 15px 40px;
            background: linear-gradient(45deg, #3ba0ff, #00ffcc);
            color: #000;
            text-decoration: none;
            border-radius: 30px;
            font-weight: bold;
            font-size: 1.2rem;
            margin: 10px;
            box-shadow: 0 5px 15px rgba(59, 160, 255, 0.4);
            transition: all 0.3s;
            opacity: 0;
            transform: translateY(30px);
            animation: fadeInUp 1s forwards 1.1s;
            position: relative;
            overflow: hidden;
        }
        
        .download-btn:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(59, 160, 255, 0.6);
        }
        
        .download-btn::after {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
            transition: all 0.6s;
        }
        
        .download-btn:hover::after {
            left: 100%;
        }
        
        .features-section {
            width: 100%;
            min-height: 100vh;
            padding: 100px 0;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        
        .section-title {
            font-size: 3rem;
            margin-bottom: 60px;
            text-align: center;
            position: relative;
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            bottom: -15px;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: linear-gradient(90deg, #3ba0ff, #00ffcc);
            border-radius: 2px;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 40px;
            width: 90%;
            max-width: 1200px;
        }
        
        .feature-card {
            background: rgba(255, 255, 255, 0.05);
            border-radius: 15px;
            padding: 30px;
            text-align: center;
            transition: all 0.3s;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            opacity: 0;
            transform: translateY(30px);
        }
        
        .feature-card.visible {
            opacity: 1;
            transform: translateY(0);
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            background: rgba(255, 255, 255, 0.1);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
        }
        
        .feature-icon {
            font-size: 3rem;
            margin-bottom: 20px;
            color: #3ba0ff;
        }
        
        .feature-title {
            font-size: 1.5rem;
            margin-bottom: 15px;
            color: #fff;
        }
        
        .feature-desc {
            color: #ccc;
            line-height: 1.6;
        }
        
        .speed-comparison {
            width: 100%;
            min-height: 100vh;
            padding: 100px 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }
        
        .comparison-container {
            width: 90%;
            max-width: 1000px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 15px;
            padding: 40px;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }
        
        .browser-bar {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
            padding: 10px;
            border-radius: 10px;
            background: rgba(0, 0, 0, 0.3);
        }
        
        .browser-icon {
            width: 24px;
            height: 24px;
            margin-right: 10px;
            border-radius: 50%;
        }
        
        .browser-name {
            font-weight: bold;
            margin-right: auto;
        }
        
        .speed-bar {
            height: 30px;
            border-radius: 15px;
            margin-bottom: 30px;
            overflow: hidden;
            position: relative;
            background: rgba(0, 0, 0, 0.3);
        }
        
        .speed-fill {
            height: 100%;
            border-radius: 15px;
            width: 0;
            transition: width 2s ease-in-out;
            position: relative;
            overflow: hidden;
        }
        
        .speed-fill::after {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
            animation: shimmer 2s infinite;
        }
        
        .speed-value {
            position: absolute;
            right: 15px;
            top: 50%;
            transform: translateY(-50%);
            font-weight: bold;
        }
        
        .footer {
            width: 100%;
            background: #131416;
            padding: 40px 0;
            text-align: center;
            color: #4a4a4a;
            font-size: 14px;
        }
        
        .footer-links {
            margin-bottom: 20px;
        }
        
        .footer-links a {
            color: #4a4a4a;
            text-decoration: none;
            margin: 0 10px;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: #3ba0ff;
        }
        
        @keyframes fadeInUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        @keyframes shimmer {
            0% {
                left: -100%;
            }
            100% {
                left: 100%;
            }
        }
        
        @keyframes float {
            0%, 100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-20px);
            }
        }
        
        .floating-element {
            position: absolute;
            animation: float 6s ease-in-out infinite;
        }
        
        .floating-element:nth-child(1) {
            top: 20%;
            left: 10%;
            animation-delay: 0s;
        }
        
        .floating-element:nth-child(2) {
            top: 60%;
            left: 5%;
            animation-delay: 1s;
        }
        
        .floating-element:nth-child(3) {
            top: 30%;
            right: 10%;
            animation-delay: 2s;
        }
        
        .floating-element:nth-child(4) {
            top: 70%;
            right: 5%;
            animation-delay: 3s;
        }
        
        .scroll-indicator {
            position: absolute;
            bottom: 30px;
            left: 50%;
            transform: translateX(-50%);
            display: flex;
            flex-direction: column;
            align-items: center;
            opacity: 0;
            animation: fadeIn 1s forwards 2s;
        }
        
        .scroll-text {
            margin-bottom: 10px;
            font-size: 14px;
            color: #ccc;
        }
        
        .scroll-arrow {
            width: 20px;
            height: 20px;
            border-right: 2px solid #3ba0ff;
            border-bottom: 2px solid #3ba0ff;
            transform: rotate(45deg);
            animation: bounce 2s infinite;
        }
        
        @keyframes bounce {
            0%, 20%, 50%, 80%, 100% {
                transform: rotate(45deg) translateY(0);
            }
            40% {
                transform: rotate(45deg) translateY(-10px);
            }
            60% {
                transform: rotate(45deg) translateY(-5px);
            }
        }
        
        @keyframes fadeIn {
            to {
                opacity: 1;
            }
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .hero-title {
                font-size: 3rem;
            }
            
            .hero-subtitle {
                font-size: 1.2rem;
            }
            
            .features-grid {
                grid-template-columns: 1fr;
            }
            
            .header {
                padding: 0 20px;
            }
            
            .nav-links a {
                margin-left: 15px;
                font-size: 12px;
            }
        }