header nav ul li a{color:#fff;text-decoration:none;font-size:1rem;position:relative;transition:color .3s}header nav ul li a:after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background-color:#7fff00;transition:width .3s ease}header nav ul li a:hover:after{width:100%}header nav ul li a:hover{color:#7fff00}*{margin:0;padding:0;box-sizing:border-box;font-family:Arial,sans-serif}html,body{height:100%;display:flex;flex-direction:column;overflow:hidden;background-color:#000;color:#fff}header{width:100%;padding:1rem 2rem;display:flex;justify-content:space-between;align-items:center;background:#000c;position:fixed;top:0;z-index:10}header .logo{font-size:1.5rem;font-weight:700;color:#fff}header nav ul{list-style:none;display:flex;gap:1.5rem}header nav ul li a{color:#fff;text-decoration:none;font-size:1rem;transition:color .3s}header nav ul li a:hover{color:#999}main{flex:1;display:flex;align-items:center;justify-content:center;position:relative;padding-top:5rem}#canvas{width:100%;height:100%;display:block;background-color:#111;position:absolute;top:0;left:0;z-index:1}.model-info{position:absolute;top:20%;right:2rem;padding:1.5rem;background:#000000b3;border:1px solid #333;border-radius:8px;max-width:300px;font-size:1rem;z-index:2}.model-info h2{font-size:1.2rem;margin-bottom:1rem}.model-info p{font-size:.9rem;margin:.5rem 0}.model-info button{margin-top:1rem;background-color:#333;border:1px solid #444;color:#fff;padding:.5rem 1rem;border-radius:4px;cursor:pointer;transition:background-color .3s}.model-info button:hover{background-color:#555}footer{background-color:#111;color:#fff;padding:1rem;text-align:center;width:100%;position:relative;z-index:10}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Arial,sans-serif;line-height:1.6;color:#fff}.hero{background:url(your-background-image.jpg) no-repeat center center/cover;height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}h1{font-size:3rem;margin-bottom:10px}.mission-details,.timeline,.gallery{padding:20px;background-color:#000;margin:20px;border-radius:8px}h2{margin-bottom:10px}.gallery-images{display:flex;gap:10px}.gallery-images img{width:100%;height:auto;border-radius:8px}footer{text-align:center;padding:10px;background:#333}