.roicontainer{background-color:#fff;border-radius:12px;box-shadow:0 10px 30px rgba(0,0,0,.1);max-width:440px;padding:30px 40px;width:100%}h1{color:#333;font-size:1.8em;text-align:center}.form-group,h1{margin-bottom:20px}label{color:#555;display:block;margin-bottom:8px}input,label{font-size:1em}input{border:1px solid #ccc;border-radius:8px;padding:12px;transition:border-color .3s;width:100%}input:focus{border-color:#4caf50;outline:none}button{background-color:#4caf50;border:none;border-radius:8px;color:#fff;cursor:pointer;font-size:1.1em;padding:12px;transition:background-color .3s;width:100%}button:hover{background-color:#45a049}#result{font-size:1.3em;font-weight:700;margin-top:30px;text-align:center}#roiResult{color:#4caf50}.error-message{color:red;font-size:.9em;margin-top:5px}#export-options{margin-top:20px;text-align:center}#export-options button{background-color:#007bff;border:none;border-radius:8px;color:#fff;cursor:pointer;font-size:1.1em;margin:5px 1%;padding:12px;transition:background-color .3s,transform .3s;width:48%}#export-options button:hover{background-color:#0056b3;transform:scale(1.05)}#export-options button:active{transform:scale(1)}#export-options button:last-child{background-color:#f39c12}#export-options button:last-child:hover{background-color:#e67e22}