body{margin:0;font-family:system-ui,sans-serif;background:#fafafa;color:#111}.upload-container{max-width:600px;margin:4rem auto;padding:2rem;background:#fff;border-radius:12px;box-shadow:0 2px 10px rgba(0,0,0,.05);text-align:center}.upload-heading{font-size:1.8rem;margin-bottom:2rem}.upload-input{margin-bottom:1rem}.upload-button{background-color:#000;color:#fff;padding:.6rem 1.2rem;border:none;border-radius:6px;font-size:1rem;cursor:pointer}.upload-button:disabled{opacity:.6;cursor:not-allowed}.error-text{color:red;margin-top:1rem}.spinner{display:inline-block;width:16px;height:16px;border:2px solid hsla(0,0%,100%,.6);border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite;vertical-align:middle}@keyframes spin{to{transform:rotate(1turn)}}