.header{display:flex;justify-content:space-around;background:#fff;padding:1rem;border-bottom:1px solid #ddd}.header div{cursor:pointer}.header .active{font-weight:bold;color:#007bff}.qr-tab{padding:1rem;cursor:pointer;border-bottom:3px solid transparent}.qr-tab.active{border-color:#007bff;font-weight:bold;color:#007bff}.tab-content{display:none}.tab-content.active{display:block}textarea,input,select{width:100%;padding:0.5rem;margin-bottom:1rem}.color-pickers{display:flex;gap:1rem}.qr-frame{display:inline-block;padding:1rem}.frame-rounded{border:4px solid #007bff;border-radius:12px}.frame-dashed{border:4px dashed #007bff}#qrcode{display:flex;justify-content:center;align-items:center;margin:1rem 0;min-height:100px}.frame-shadow{box-shadow:0 0 15px rgba(0,0,0,0.2);border:4px solid transparent}