/* bai2.css */
    body {
      font-family: 'Roboto', sans-serif;
      background: linear-gradient(to bottom right, #d4fc79, #96e6a1);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    nav {
      background: #28a745;
      color: white;
      padding: 15px 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    nav a {
      color: white;
      text-decoration: none;
      font-weight: bold;
    }

    .container {
      max-width: 700px;
      margin: 40px auto;
      background: #eaffd0;
      padding: 30px;
      border-radius: 12px;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    }

    h2 {
      text-align: center;
      color: #2c3e50;
      margin-bottom: 20px;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      background-color: #e1ff78;
      text-align: center;
    }

    th {
      background-color: yellow;
      color: blue;
      padding: 10px;
      font-size: 18px;
    }

    td {
      padding: 10px;
    }

    select {
      width: 100%;
      height: 100px;
    }

    .radio-group {
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    button {
      margin-top: 20px;
      padding: 10px 25px;
      font-size: 16px;
      background: #28a745;
      color: white;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      transition: background 0.3s ease;
    }

    button:hover {
      background: #218838;
    }

    .result {
      margin-top: 20px;
      text-align: center;
      font-size: 20px;
      font-weight: bold;
      color: #2c3e50;
    }

    footer {
      text-align: center;
      padding: 20px;
      font-size: 14px;
      color: #666;
    }