styles.css

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f4f4f4;
    transition: background-color 0.3s ease; /* added transition effect */
  }
  
  .container {
    max-width: 960px;
    margin: 0 auto;
    border: 2px solid #ccc;
    padding: 20px;
    border-radius: 10px; /* added border-radius */
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1); /* added box-shadow */
  }
  
  h1, h2 {
    text-align: center;
    color: #333; /* changed text color */
  }
  
  form {
    margin-bottom: 20px;
    padding: 20px; /* added padding */
    border: 1px solid #ccc; /* added border */
    border-radius: 10px; /* added border-radius */
  }
  
  .text-center {
    text-align: center;
  }
  
  #costReport {
    background-color: #f9f9f9;
    padding: 10px;
    label {
      display: block;
      margin-bottom: 5px;
    }
    input {
      width: 100%;
      padding: 5px;
      margin-bottom: 10px;
      border: 1px solid #ccc; /* added border */
      border-radius: 5px; /* added border-radius */
    }
    .tooltip {
      display: block;
      font-size: 12px;
      color: #777;
      margin-bottom: 10px;
    }
    margin-bottom: 20px;
  }
  
  /* Add dark mode styles */
  .dark-mode {
    background-color: #333;
    color: #fff;
  }
  
  /* Apply dark mode to specific elements */
  body.dark-mode {
    background-color: #333;
    color: #fff;
  }
  
  .container.dark-mode {
    background-color: #444;
    color: #fff;
  }
  
  /* Add tooltip styles */
  .tooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px dotted #666;
    cursor: help;
  }
  
  .tooltip .tooltiptext {
    visibility: hidden;
    width: 120px;
    background-color: #555;
    color: #fff;
    text-align: center;
    border-radius: 6px;
    padding: 5px 0;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    margin-left: -60px;
    opacity: 0;
    transition: opacity 0.3s;
  }
  
  .tooltip .tooltiptext::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: #555 transparent transparent transparent;
  }
  
  .tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
  }