:root{--primary-color:#3498db;--secondary-color:#2ecc71;--dark-color:#2c3e50;--light-color:#ecf0f1;--gray-color:#95a5a6}*{margin:0;padding:0;box-sizing:border-box;font-family:Segoe UI,Microsoft YaHei,sans-serif}body{line-height:1.6;color:#333;background-color:#f9f9f9}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}.navbar{background-color:transparent;position:fixed;width:100%;top:0;z-index:1000;transition:all .3s ease}.navbar.scrolled{background-color:hsla(0,0%,100%,.95);box-shadow:0 5px 20px rgba(0,0,0,.1);padding:10px 0}.nav-container{display:flex;justify-content:space-between;align-items:center;padding:15px 0}.logo{font-size:24px;font-weight:700;color:var(--primary-color);text-decoration:none}.logo span{color:var(--secondary-color)}.nav-links{display:flex;list-style:none;margin-left:auto}.nav-links li{margin-left:30px}.nav-links a{text-decoration:none;color:var(--dark-color);font-weight:500;transition:color .3s}.nav-links a:hover{color:var(--primary-color)}.lang-switch{margin-left:30px}.lang-button{background:transparent;border:1px solid hsla(0,0%,100%,.3);color:#fff;padding:6px 15px;border-radius:20px;cursor:pointer;font-size:14px;font-weight:500;transition:all .3s ease}.lang-button:hover{background:hsla(0,0%,100%,.1);border-color:hsla(0,0%,100%,.5)}.hamburger{display:none;flex-direction:column;cursor:pointer;width:30px}.hamburger span{width:100%;height:3px;background-color:var(--dark-color);margin:3px 0;transition:all .3s ease}.hamburger.active span:first-child{transform:rotate(45deg) translate(8px,8px)}.hamburger.active span:nth-child(2){opacity:0}.hamburger.active span:nth-child(3){transform:rotate(-45deg) translate(7px,-7px)}.cta-button{background-color:var(--primary-color);color:#fff;padding:10px 25px;border-radius:50px;text-decoration:none;font-weight:700;transition:background-color .3s,transform .3s}.cta-button:hover{background-color:#2980b9;transform:translateY(-2px)}.hero{position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;color:#fff;overflow:hidden;padding:80px 0}.hero:before{background-image:url(https://oan-oss.oan.cn/oan/f06f85e504b3.avif);background-size:cover;background-position:50%;background-repeat:no-repeat;z-index:-2}.hero:after,.hero:before{content:"";position:absolute;top:0;left:0;width:100%;height:100%}.hero:after{z-index:-1}.hero-content{position:relative;z-index:1;max-width:800px;padding:40px}.hero h1{font-size:3.5rem;margin-bottom:20px;line-height:1.2;text-shadow:0 2px 10px rgba(0,0,0,.3)}.hero p{font-size:1.2rem;margin-bottom:40px;opacity:.95;text-shadow:0 1px 5px rgba(0,0,0,.2)}.hero-buttons{display:flex;justify-content:center;gap:20px;flex-wrap:wrap}.btn-primary{background-color:var(--secondary-color);color:#fff;padding:15px 35px;border-radius:50px;text-decoration:none;font-size:1.1rem;font-weight:700;box-shadow:0 4px 15px rgba(46,204,113,.4);transition:all .3s ease}.btn-primary:hover{background-color:#27ae60;transform:translateY(-3px);box-shadow:0 6px 20px rgba(46,204,113,.6)}.btn-secondary{background-color:transparent;color:#fff;border:2px solid #fff;padding:15px 35px;border-radius:50px;text-decoration:none;font-size:1.1rem;font-weight:700;transition:all .3s ease}.btn-secondary:hover{background-color:hsla(0,0%,100%,.1);transform:translateY(-3px)}.services{padding:100px 0;background-color:#fff}.section-title{text-align:center;margin-bottom:60px}.section-title h2{font-size:2.5rem;color:var(--dark-color);margin-bottom:15px}.section-title p{color:var(--gray-color);font-size:1.1rem;max-width:600px;margin:0 auto}.services-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));grid-gap:40px;gap:40px}.service-card{background-color:#fff;border-radius:10px;padding:40px 30px;text-align:center;box-shadow:0 10px 30px rgba(0,0,0,.08);transition:transform .3s,box-shadow .3s}.service-card:hover{transform:translateY(-10px);box-shadow:0 15px 40px rgba(0,0,0,.12)}.service-icon{font-size:3rem;color:var(--primary-color);margin-bottom:25px}.service-card h3{font-size:1.5rem;margin-bottom:15px;color:var(--dark-color)}.service-card p{color:#666}.features{padding:100px 0;background-color:#f8f9fa}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));grid-gap:30px;gap:30px}.feature-item{display:flex;align-items:flex-start;margin-bottom:30px}.feature-icon{background-color:var(--primary-color);color:#fff;width:50px;height:50px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin-right:20px;flex-shrink:0}.feature-text h4{font-size:1.3rem;margin-bottom:10px;color:var(--dark-color)}.use-cases{padding:80px 0;background-color:#fff}.case-list{display:flex;justify-content:space-around;flex-wrap:wrap;gap:20px}.case-item{text-align:center;padding:20px;flex:1 1;min-width:200px}.case-item i{font-size:2.5rem;color:var(--primary-color);margin-bottom:15px}footer{background-color:var(--dark-color);color:#fff;padding:60px 0 30px}.footer-content{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));grid-gap:40px;gap:40px;margin-bottom:40px}.footer-section h4{font-size:1.3rem;margin-bottom:20px;color:var(--light-color)}.footer-links{list-style:none}.footer-links li{margin-bottom:10px}.footer-links a{color:#bdc3c7;text-decoration:none;transition:color .3s}.footer-links a:hover{color:#fff}.copyright{text-align:center;padding-top:30px;border-top:1px solid #34495e;color:#95a5a6;font-size:.9rem}@media (max-width:768px){.hero h1{font-size:2.5rem}.nav-container{padding:15px 10px}.logo{margin-left:10px}.hamburger{display:flex;margin-right:10px}.nav-links{position:fixed;top:60px;left:0;right:0;background-color:#fff;flex-direction:column;align-items:center;padding:20px 0;box-shadow:0 5px 20px rgba(0,0,0,.1);display:none;margin-left:0}.nav-links.active{display:flex}.nav-links li{margin:15px 0}.nav-links a{font-size:1.1rem}.nav-links .lang-button{background:rgba(44,62,80,.9);border:1px solid rgba(44,62,80,.3);color:#fff}.nav-links .lang-button:hover{background:rgba(52,152,219,.9);border-color:rgba(52,152,219,.5)}.hero-buttons{flex-direction:column;align-items:center}.btn-primary,.btn-secondary{width:100%;max-width:300px;text-align:center}.hero-content{padding:30px 20px;margin:0 20px}}@media (max-width:480px){.hero h1{font-size:2rem}.hero p{font-size:1rem}.section-title h2{font-size:2rem}}