body{font-family:Arial,sans-serif;background-color:#f9f9f9;margin:0;padding:0;display:flex;justify-content:center;align-items:center;height:100vh}.container{text-align:center;background:#fff;padding:40px 20px;border-radius:8px;box-shadow:0 0 15px rgba(0,0,0,.1);min-width:400px;max-width:600px;margin:0 auto}h1{color:#007bff;margin-bottom:20px}form{margin-top:20px}label{display:block;margin-bottom:10px;font-weight:700}input[type=file]{display:block;margin:0 auto 20px;padding:10px;width:100%;box-sizing:border-box}button{background-color:#007bff;color:#fff;border:none;padding:10px 20px;border-radius:5px;cursor:pointer;margin-top:20px;margin-bottom:20px}button:hover{background-color:#0056b3}.download-results{margin-top:40px}.download-results h2{margin-bottom:20px}.download-results a{display:block;color:#007bff;text-decoration:none;margin:10px 0;padding:10px;border:2px solid #007bff;border-radius:5px;transition:background-color .3s,color .3s;cursor:pointer}.download-results a:hover{background-color:#007bff;color:#fff}.spinner{margin:20px auto;border:5px solid #f3f3f3;border-top-color:#007bff;border-radius:50%;width:50px;height:50px;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}