body {
      font-family: 'Segoe UI', Arial, sans-serif;
      margin: 0;
      background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
      min-height: 100vh;
    }
    .container {
      max-width: 1100px;
      margin: 40px auto;
      background: #fff;
      padding: 32px 32px 24px 32px;
      border-radius: 18px;
      box-shadow: 0 6px 32px rgba(60, 72, 88, 0.12), 0 1.5px 6px rgba(60, 72, 88, 0.08);
    }
    h1, h2 {
      text-align: center;
      color: #2d3a4a;
      margin-bottom: 18px;
      letter-spacing: 1px;
    }    
    h1 {
      font-size: 2.2rem;
      font-weight: 700;
      margin-top: 0;
    }    
    h2 {
      font-size: 1.3rem;
      font-weight: 600;
      margin-top: 18px;
    }    
    .row {
      display: flex;
      flex-wrap: wrap;
      gap: 28px;
      margin-bottom: 18px;
    }    
    .col {
      flex: 1 1 0;
      min-width: 240px;
      background: #f7fafd;
      border-radius: 12px;
      padding: 18px 16px 12px 16px;
      box-shadow: 0 1px 4px rgba(60, 72, 88, 0.06);
    }    
    label {
      font-weight: 500;
      color: #3a4656;
      display: block;
      margin-bottom: 6px;
      letter-spacing: 0.2px;
    }    
    input[type="number"], select {
      width: 70%;
      padding: 8px 10px;
      margin: 4px 0 12px 0;
      border: 1px solid #d1d5db;
      border-radius: 7px;
      background: #f8fafb;
      font-size: 1rem;
      transition: border 0.2s;
    }    
    input[type="number"]:focus, select:focus {
      border: 1.5px solid #6abf69;
      outline: none;
      background: #f4fff4;
    }    
    button, .addLoadBtn {
      background: linear-gradient(90deg, #6abf69 0%, #4e9e5d 100%);
      color: #fff;
      padding: 10px 22px;
      border: none;
      border-radius: 7px;
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      margin-top: 8px;
      box-shadow: 0 2px 8px rgba(60, 72, 88, 0.08);
      transition: background 0.2s, box-shadow 0.2s;
    }    
    button:hover, .addLoadBtn:hover {
      background: linear-gradient(90deg, #4e9e5d 0%, #6abf69 100%);
      box-shadow: 0 4px 16px rgba(60, 72, 88, 0.13);
    }    
    .addLoadBtn {
      margin-left: 0;
      margin-top: 0;
      padding: 7px 16px;
      font-size: 0.97rem;
    }    
    .removeBtn, .removeLoadBtn {
      background: #e74c3c;
      color: #fff;
      margin-left: 16px;
      padding: 7px 14px;
      border-radius: 7px;
      font-size: 0.97rem;
      border: none;
      cursor: pointer;
      transition: background 0.2s;
    }    
    .removeBtn:hover, .removeLoadBtn:hover {
      background: #c0392b;
    }    
    details {
      margin-bottom: 18px;
      background: #f3f6fa;
      border-radius: 10px;
      box-shadow: 0 1px 4px rgba(60, 72, 88, 0.06);
      padding: 10px 14px 8px 14px;
    }    
    details[open] summary {
      font-weight: 600;
      color: #2d3a4a;
    }    
    summary {
      font-size: 1.08rem;
      cursor: pointer;
      outline: none;
      margin-bottom: 8px;
    }    
    #resultArea {
      position: relative;
      min-height: 60px;
      margin-top: 30px;
      background: #f7fafd;
      border-radius: 12px;
      box-shadow: 0 1px 4px rgba(60, 72, 88, 0.06);
      padding: 18px 18px 10px 18px;
    }    
    #resultsContent {
      font-size: 1.08rem;
      color: #2d3a4a;
    }    
    #steelCheckArea {
      margin-top: 18px;
      font-size: 1.05rem;
      color: #2d3a4a;
    }    
    .result {
      background: #e8f0fe;
      padding: 12px;
      border-radius: 8px;
      margin-top: 20px;
    }    
    table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 10px;
      background: #f8fafb;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 1px 4px rgba(60, 72, 88, 0.06);
    }    
    th, td {
      border: 1px solid #e0e6ed;
      padding: 8px 6px;
      text-align: center;
      font-size: 1rem;
    }    
    th {
      background: #e3e9f2;
      color: #2d3a4a;
      font-weight: 600;
    }    
    tr:nth-child(even) {
      background: #f4f7fa;
    }    
    canvas {
      display: block;
      margin: 18px auto 10px auto;
      background: #fff;
      border-radius: 8px;
      box-shadow: 0 1px 4px rgba(60, 72, 88, 0.07);
    }    
    #downloadBtn {
      display: block !important;
      position: absolute;
      top: 18px;
      right: 18px;
      z-index: 9999;
    }    
    #downloadBtn:hover {
      background: linear-gradient(90deg, #6abf69 0%, #3a4656 100%);
    }    
    input[type="radio"] {
      accent-color: #6abf69;
      margin-right: 4px;
    }    
    input[type="radio"]:focus {
      outline: 2px solid #6abf69;
    }    
    ::-webkit-input-placeholder { color: #b0b8c1; }
    ::-moz-placeholder { color: #b0b8c1; }
    :-ms-input-placeholder { color: #b0b8c1; }
    ::placeholder { color: #b0b8c1; }    
     
      @media (max-width: 900px) {
        .row {
          flex-direction: column;
          gap: 0;
        }
        .col {
          min-width: 100%;
          margin-bottom: 18px;
          padding: 12px 6px 8px 6px;
        }
        .container {
          padding: 12px 4px 12px 4px;
          max-width: 100vw;
        }
        table, th, td {
          font-size: 0.95rem;
          word-break: break-word;
          max-width: 100vw;
        }
        table {
          width: 100%;
          overflow-x: auto;
          display: block;
        }
        canvas {
          width: 100% !important;
          max-width: 100vw !important;
          height: auto !important;
          min-width: 0 !important;
        }
        #resultArea, #resultsContent, #steelCheckArea {
          padding: 12px 4px 10px 4px;
          max-width: 100vw;
          overflow-x: auto;
        }
      }