.wp-investment-calculator{max-width:650px;margin:30px auto;background:#fff;padding:30px;border-radius:10px;box-shadow:0 0 10px rgba(0,0,0,.1)}
.wp-investment-calculator label{display:block;margin-top:12px;font-weight:bold}
.wp-investment-calculator input,.wp-investment-calculator select{width:100%;padding:10px;margin-top:5px}
.wp-investment-calculator button{margin-top:20px;padding:12px;width:100%;background:#27ae60;color:#fff;border:none;border-radius:5px;cursor:pointer}
.wp-investment-result{margin-top:25px;padding:20px;background:#e9f7ef;border-radius:6px;display:none;color:#1e7e34}