.roe-wrap{
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  padding: 28px;
  color: #111;
}

.roe-card{
  max-width: 980px;
  margin: 0 auto;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0,0,0,.12);
  padding: 28px 30px 26px;
}

.roe-card h2{
  margin: 0 0 10px;
  font-size: 34px;
  letter-spacing: -0.02em;
}

.roe-sub{
  margin: 0 0 26px;
  font-size: 16px;
  line-height: 1.6;
  color: #444;
  max-width: 860px;
}

.roe-row{
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 0 0 18px;
}

.roe-field label{
  display: block;
  font-size: 14px;
  color: #777;
  margin-bottom: 8px;
}

.roe-field input{
  width: 100%;
  border: none;
  border-bottom: 2px solid #d6d6d6;
  padding: 10px 2px 12px;
  font-size: 22px;
  outline: none;
}

.roe-field input:focus{
  border-bottom-color: #111;
}

.roe-help{
  margin-top: 8px;
  font-size: 14px;
  color: #777;
}

.roe-btn{
  appearance: none;
  border: none;
  background: #111;
  color: #fff;
  padding: 14px 18px;
  font-size: 16px;
  border-radius: 4px;
  cursor: pointer;
  display: inline-block;
  margin-top: 8px;
}

.roe-btn:hover{
  background: #000;
}

.roe-btn:disabled{
  opacity: 0.6;
  cursor: not-allowed;
}

.roe-result{
  margin-top: 22px;
  font-size: 18px;
  line-height: 1.55;
}

.roe-number{
  color: #b00020;
  font-weight: 800;
}

.roe-note{
  margin-top: 10px;
  color: #666;
  font-size: 14px;
}

.roe-error{
  margin-top: 12px;
  color: #b00020;
  font-size: 14px;
}

@media (max-width: 680px){
  .roe-card{ padding: 22px 18px; }
  .roe-card h2{ font-size: 26px; }
  .roe-field input{ font-size: 20px; }
}