@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700;900&display=swap');
        * {font-family: 'Noto Sans SC', sans-serif;}           
        html { scroll-behavior: smooth; }           
        /* 自定义动画 */
        @keyframes float { 0%, 100% { transform: translateY(0px); } 50% { transform: translateY(-20px); } }
        @keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
        @keyframes pulse-slow { 0%, 100% { opacity: 0.4; } 50% { opacity: 0.8; } }        
        .animate-float {animation: float 6s ease-in-out infinite;}        
        .animate-fade-in-up { animation: fadeInUp 0.8s ease-out forwards; }        
        .animate-pulse-slow { animation: pulse-slow 4s ease-in-out infinite; }
        /* 科技感背景网格 */
        .tech-grid { background-image: linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px); background-size: 50px 50px; }
        .tech-grid-bg { background-image: linear-gradient(rgba(59,130,246,0.05) 1px, transparent 1px), linear-gradient(90deg, rgba(59,130,246,0.05) 1px, transparent 1px); background-size: 60px 60px; }
        /* 渐变文字 */
        .gradient-text { background: linear-gradient(135deg, #3b82f6 0%, #1e40af 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        /* 玻璃态效果 */
        .glass-effect { background: rgba(255, 255, 255, 0.7); backdrop-filter: blur(20px); border: 1px solid rgba(255, 255, 255, 0.3); }
        .glass-card { background: rgba(255,255,255,0.72); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border: 1px solid rgba(255,255,255,0.5); border-radius: 16px; box-shadow: 0 8px 32px rgba(0,0,0,0.06); }
        .glass-dark { background: rgba(15, 23, 42, 0.7); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border: 1px solid rgba(255, 255, 255, 0.1); }
        /* 导航栏滚动效果 */
        .nav-scrolled { background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(20px); box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08); }
        /* 卡片悬浮效果 */
        .card-hover { transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); }        
        .card-hover:hover { transform: translateY(-8px); box-shadow: 0 20px 40px rgba(59, 130, 246, 0.15); }        
        /* 按钮发光效果 */
        .btn-glow { box-shadow: 0 0 20px rgba(59, 130, 246, 0.4); transition: all 0.3s ease; }        
        .btn-glow:hover { box-shadow: 0 0 40px rgba(59, 130, 246, 0.6); transform: translateY(-2px); }        
        /* 移动端菜单 */
        .mobile-menu { transform: translateX(100%); transition: transform 0.3s ease; }        
        .mobile-menu.active { transform: translateX(0); }        
        /* 移动端菜单遮罩 */
        .mobile-overlay { position: fixed; inset: 0; background: rgba(0, 0, 0, 0.5); z-index: 45; opacity: 0; pointer-events: none; transition: opacity 0.3s ease; }        
        .mobile-overlay.active { opacity: 1; pointer-events: auto; }        
        /* 微信二维码弹出 */
        .wechat-wrapper { position: relative; }        
        .wechat-qr { position: absolute; bottom: calc(100% + 12px); left: 50%; transform: translateX(-50%) scale(0.9); width: 180px; background: white; border-radius: 12px; padding: 16px; box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2); opacity: 0; pointer-events: none; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); z-index: 50; }       
        .wechat-qr::after { content: ''; position: absolute; top: 100%; left: 50%; transform: translateX(-50%); border: 8px solid transparent; border-top-color: white; }        
        .wechat-wrapper:hover .wechat-qr { opacity: 1; pointer-events: auto; transform: translateX(-50%) scale(1); }        
        /* 右下角浮动按钮组 */
       .floating-btn-group { position: fixed; bottom: 100px; right: 30px; z-index: 100; display: flex; flex-direction: column; gap: 12px; }
       .floating-btn { width: 50px; height: 50px; border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all 0.3s ease; box-shadow: 0 4px 15px rgba(0,0,0,0.15); position: relative; }
       .floating-btn:hover { transform: scale(1.1); box-shadow: 0 6px 20px rgba(0,0,0,0.25); }
       .floating-wechat-btn { background: linear-gradient(135deg, #22c55e, #16a34a); }
       .floating-top-btn { background: linear-gradient(135deg, #3b82f6, #1e40af); }
       .floating-qr-popup { position: absolute; right: 62px; top: 50%; transform: translateY(-50%) translateX(10px); width: 220px; background: white; border-radius: 12px; box-shadow: 0 10px 40px rgba(0,0,0,0.15); padding: 20px; opacity: 0; visibility: hidden; transition: all 0.3s ease; pointer-events: none; }
       .floating-wechat-btn:hover .floating-qr-popup { opacity: 1; visibility: visible; transform: translateY(-50%) translateX(0); }
       .floating-qr-popup::after { content: ''; position: absolute; right: -8px; top: 50%; transform: translateY(-50%); width: 0; height: 0; border-top: 8px solid transparent; border-bottom: 8px solid transparent; border-left: 8px solid white; }