.circle-tool{max-width:520px;margin:auto;padding:20px;background:#fff;border-radius:12px;text-align:center;box-shadow:0 0 15px rgba(0,0,0,.1)}
.preview-area img{max-width:100%;margin-top:10px;border-radius:10px}
button{margin-top:15px;padding:10px 20px;border:none;background:#2ecc71;color:#fff;font-size:16px;border-radius:6px;cursor:pointer}
.progress{width:100%;background:#eee;border-radius:5px;margin-top:15px;display:none}
.progress-bar{height:8px;width:0;background:#2ecc71;border-radius:5px}
canvas{display:none;margin-top:15px;max-width:100%}
#downloadBtn{display:none;margin-top:15px;background:#3498db;color:#fff;padding:10px 20px;border-radius:6px;text-decoration:none}