.converter { max-width: 700px; margin: 0 auto 40px auto; }
  .copy { font-size: 14px; color: #555; margin-bottom: 20px; }
  .row-layout {
    display: flex; align-items: center; justify-content: center;
    flex-wrap: wrap; gap: 8px; margin-bottom: 20px;
  }
  .label { font-weight: bold; margin-right: 4px; width: 160px; text-align: right; }
  select, input[type="number"] {
    width: 200px; padding: 6px 10px; font-size: 16px; text-align: center;
    border: 2px solid #d7e2fa; border-radius: 6px; box-sizing: border-box;
  }
  .result-layout { display: flex; flex-direction: column; gap: 10px; align-items: center; margin-top: 20px; }
  .row-result { display: flex; align-items: center; justify-content: center; gap: 8px; flex-wrap: wrap; }
  .result-label { font-weight: bold; width: 160px; text-align: right; }
  .result-row {
    display: flex; align-items: center; justify-content: space-between;
    border: 2px solid #4caf50; background: #f1f8e9; border-radius: 6px;
    padding: 8px 12px; color: #2e7d32; font-size: 16px; width: 240px; position: relative;
  }
  .copy-button {
    margin-left: 10px; padding: 6px 10px; font-size: 13px;
    cursor: pointer; background: #eeeeee; border: 2px solid #cccccc;
    border-radius: 6px; white-space: nowrap;
  }
  .copied-msg {
    position: absolute; right: 80px; top: 50%; transform: translateY(-50%);
    font-size: 12px; color: #4caf50; opacity: 0; transition: opacity 0.3s ease-in-out;
  }
  .copied-msg.visible { opacity: 1; }
  @media (max-width: 600px) {
    .row-layout, .row-result { flex-direction: column; align-items: center; }
    .label, .result-label { width: auto; text-align: center; }
    .result-row { width: 250px; }
  }