.container{min-height:100vh;display:flex;justify-content:center;align-items:center;padding:20px;background-color:#f0f2f5}.container .upload-box{background:#fff;padding:2rem;border-radius:12px;box-shadow:0 2px 10px rgba(0,0,0,.1);width:100%;max-width:500px;text-align:center}.container .upload-box h1{margin-bottom:2rem;color:#2c3e50;font-size:1.8rem}.container .file-input{margin-bottom:1.5rem}.container .file-input input[type=file]{display:none}.container .file-input label{display:block;padding:1rem 2rem;background:#3498db;color:#fff;border-radius:6px;cursor:pointer;transition:background-color .3s}.container .file-input label:hover{background:#2980b9}.container .password-input{margin-bottom:1.5rem}.container .password-input input{width:100%;padding:.8rem;border:1px solid #ddd;border-radius:6px;font-size:1rem}.container .password-input input:focus{outline:none;border-color:#3498db;box-shadow:0 0 0 2px rgba(52,152,219,.2)}.container .decrypt-button{width:100%;padding:1rem;background:#27ae60;color:#fff;border:none;border-radius:6px;font-size:1rem;cursor:pointer;transition:background-color .3s}.container .decrypt-button:hover:not(:disabled){background:#219a52}.container .decrypt-button:disabled{background:#95a5a6;cursor:not-allowed}.container .error-message{color:#e74c3c;margin:1rem 0;font-size:.9rem}.container .loading-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:hsla(0,0%,100%,.8);display:flex;justify-content:center;align-items:center}.container .loading-overlay .loading-spinner{border:4px solid #f3f3f3;border-top-color:#3498db;border-radius:50%;width:40px;height:40px;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}