* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #2c3e50;
    padding: 20px;
    min-height: 100vh;
  }

  .container {
    max-width: 1100px;
    margin: 0 auto;
    background: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
  }

  .navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
  }

  .navbar h1 {
    font-size: 2rem;
    color: #2c3e50;
  }

  .instructions button {
    background-color: #2c3e50;
    color: white;
    padding: 8px 16px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
  }

  .instructions button:hover {
    background-color: #2980b9;
  }

  .modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.6);
  }

  .modal-content {
    background-color: #fff;
    margin: 10% auto;
    padding: 20px 30px;
    border-radius: 12px;
    max-width: 700px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.25);
    font-family: 'Nunito Sans', sans-serif;
    font-size: 18px;
  }
/* 
  .close {
    float: right;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
  }

  .close:hover {
    color: #e53935;
  } */

  h2 {
    color: #34495e;
    margin-top: 25px;
    margin-bottom: 15px;
  }

  .section {
    margin-bottom: 30px;
    padding: 20px;
    background-color: #fafbfc;
    border-radius: 8px;
    border: 1px solid #ddd;
  }

  .input-row {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
    flex-wrap: wrap;
  }

  label {
    min-width: 200px;
    font-weight: 500;
    color: #555;
  }

  input[type="number"] {
    padding: 8px 12px;
    border: 2px solid #dfe6e9;
    border-radius: 6px;
    width: 250px;
  }

  input[type="number"]:focus {
    outline: none;
    border-color: #3498db;
  }

  button#calcButton {
    background-color: #2c3e50;
    color: white;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    margin-top: 15px;
  }

  button#calcButton:hover {
    background-color: #2980b9;
  }

  canvas {
    width: 100%;
    max-width: 800px;
    height: 400px;
    display: block;
    margin: 20px auto;
  }

  #faultSection img,
  .container img {
    display: block;
    margin: 0 auto;
    max-width: 500px;
    width: 100%;
  }    
  footer {
      text-align: center;
      padding: 10px;
      margin-top: 30px;
      margin-left: -30px;
      margin-right: -30px;
      margin-bottom: -42px;
      background-color: #466581;
      color: white;
      border-radius: 0 0 12px 12px;
      font-size: 16px;
    }