*{margin:0;padding:0;box-sizing:border-box}body{font-family:Arial,sans-serif;background:radial-gradient(circle,#00002a,#000015);color:#fff;overflow:hidden;position:relative;min-height:100vh;width:100vw}.background{position:absolute;top:0;left:0;width:100%;height:100%;z-index:-1}.sun{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:150px;height:150px;background-color:#fc0;border-radius:50%;box-shadow:0 0 50px #ffdf00cc}.orbit{position:absolute;top:50%;left:50%;border-radius:50%;transform:translate(-50%,-50%)}.planet{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);border-radius:50%}#mercury{width:30px;height:30px;background-color:#8b8b8b;animation:orbit-mercury 7s linear infinite}#venus{width:40px;height:40px;background-color:#d9a93a;animation:orbit-venus 10s linear infinite}#earth{width:45px;height:45px;background-color:#3b74e0;animation:orbit-earth 15s linear infinite}#mars{width:35px;height:35px;background-color:#b14f3c;animation:orbit-mars 20s linear infinite}#jupiter{width:80px;height:80px;background-color:#d4a46d;animation:orbit-jupiter 30s linear infinite}#saturn{width:70px;height:70px;background-color:#e1c27b;animation:orbit-saturn 35s linear infinite}#uranus{width:55px;height:55px;background-color:#6cdbdb;animation:orbit-uranus 40s linear infinite}#neptune{width:60px;height:60px;background-color:#4e76b5;animation:orbit-neptune 45s linear infinite}@keyframes orbit-mercury{0%{transform:rotate(0) translate(100px) rotate(0)}to{transform:rotate(360deg) translate(100px) rotate(-360deg)}}@keyframes orbit-venus{0%{transform:rotate(0) translate(150px) rotate(0)}to{transform:rotate(360deg) translate(150px) rotate(-360deg)}}@keyframes orbit-earth{0%{transform:rotate(0) translate(200px) rotate(0)}to{transform:rotate(360deg) translate(200px) rotate(-360deg)}}@keyframes orbit-mars{0%{transform:rotate(0) translate(250px) rotate(0)}to{transform:rotate(360deg) translate(250px) rotate(-360deg)}}@keyframes orbit-jupiter{0%{transform:rotate(0) translate(300px) rotate(0)}to{transform:rotate(360deg) translate(300px) rotate(-360deg)}}@keyframes orbit-saturn{0%{transform:rotate(0) translate(350px) rotate(0)}to{transform:rotate(360deg) translate(350px) rotate(-360deg)}}@keyframes orbit-uranus{0%{transform:rotate(0) translate(400px) rotate(0)}to{transform:rotate(360deg) translate(400px) rotate(-360deg)}}@keyframes orbit-neptune{0%{transform:rotate(0) translate(450px) rotate(0)}to{transform:rotate(360deg) translate(450px) rotate(-360deg)}}.stars{position:absolute;top:0;left:0;width:100%;height:100%;background:transparent;z-index:-1}.star{position:absolute;background-color:#fffc;border-radius:50%;animation:twinkling 1.5s infinite alternate}@keyframes twinkling{0%{opacity:.5}to{opacity:1}}header{text-align:center;padding:20px;color:#000;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;font-weight:700;text-shadow:0 0 8px rgba(255,255,255,1),0 0 15px rgba(255,255,255,.9),0 0 20px rgba(255,255,255,.7);letter-spacing:1px}main{padding:20px;text-align:center;margin-top:50px}#planets{display:flex;justify-content:space-around;flex-wrap:wrap;margin-bottom:40px}.planet-info{background-color:#323264cc;border-radius:15px;padding:20px;width:40%;margin:15px;transition:transform .3s,box-shadow .3s;box-shadow:0 4px 20px #0003;color:#fff;font-family:Arial,sans-serif}.planet-info:hover{transform:scale(1.05);box-shadow:0 8px 30px #0000004d}.planet-info h3{font-size:1.5em;margin-bottom:10px;text-align:center;color:#fff;font-weight:700;font-family:Arial,sans-serif;font-style:italic;text-shadow:0 0 5px rgba(255,255,255,.7),0 0 10px rgba(0,0,255,.7);background:none}.planet-info p{font-size:1.1em;line-height:1.5;text-align:justify}#solar-system{display:flex;justify-content:center;align-items:center}button{padding:20px 40px;background:linear-gradient(135deg,#000080cc,#4b0082cc);border:none;color:#fff;font-size:1.5em;cursor:pointer;border-radius:10px;transition:background .3s,transform .3s;margin-bottom:50px;box-shadow:0 4px 20px #00000080;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;letter-spacing:.5px;text-transform:none}button:hover{background:linear-gradient(135deg,#000096e6,#9600ffe6);transform:scale(1.1)}@media (max-width: 500px){.planet-info{width:90%;margin:10px auto}button{width:100%}#planets{flex-direction:column;align-items:center}}footer{position:fixed;bottom:0;left:0;width:100%;text-align:center;padding:10px;background-color:#00003280;color:#ddd;z-index:1}