body {
      font-family: 'Segoe UI', sans-serif;
      background: #f4f4f4;
      margin: 0;
      padding: 20px;
    }
    .calculator-layout {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      max-width: 1000px;
      margin: auto;
    }
    .calculator-left, .calculator-right {
      flex: 1 1 45%;
      background: #fff;
      padding: 20px;
      border-radius: 10px;
      box-shadow: 0 0 10px rgba(0,0,0,0.05);
    }
    .calc-block label {
      display: block;
      margin-top: 15px;
      font-weight: bold;
    }
    .calc-block input, .calc-block select {
      width: 100%;
      padding: 10px;
      margin-top: 5px;
      font-size: 16px;
      border: 1px solid #ccc;
      border-radius: 6px;
    }
    .result-block h2 {
      margin-top: 0;
      font-size: 24px;
      text-align: center;
    }
    .result-block p {
      font-size: 18px;
      margin: 10px 0;
    }
    .copy-btn {
      margin-top: 15px;
      background: #0078d7;
      color: #fff;
      border: none;
      padding: 10px;
      font-size: 16px;
      border-radius: 6px;
      cursor: pointer;
    }
    .copy-btn:hover {
      background: #005fa3;
    }
    table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 20px;
      font-size: 14px;
    }
    th, td {
      border: 1px solid #ccc;
      padding: 8px;
      text-align: center;
    }
    th {
      background: #eee;
    }