.epc-calculator{border:1px solid #ddd;padding:16px;border-radius:6px;max-width:720px;background:#fff;font-family:Arial,Helvetica,sans-serif}
.epc-calculator label{display:block;margin:8px 0;font-weight:600}
.epc-calculator input,.epc-calculator select{width:100%;padding:8px;margin-top:4px;box-sizing:border-box;border:1px solid #ccc;border-radius:4px}
.epc-calculator .buttons{margin-top:12px}
.epc-calculator button{margin-right:8px;padding:8px 12px;border-radius:4px;cursor:pointer;background:#0073aa;color:#fff;border:none}
#epc_output{background:#f9f9f9;padding:10px;border-radius:6px}