/* bai1.css */
    :root {
      --primary: #2980b9;
      --highlight: #f39c12;
    }

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

    body {
      font-family: 'Roboto', sans-serif;
      background: linear-gradient(135deg, #6dd5fa, #ffffff);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    nav {
      background: linear-gradient(to right, #2980b9, #6dd5fa);
      padding: 15px 40px;
      color: white;
      display: flex;
      justify-content: space-between;
      align-items: center;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    }

    nav h1 {
      font-size: 24px;
      font-weight: 700;
    }

    nav ul {
      display: flex;
      gap: 20px;
    }

    nav ul li {
      list-style: none;
    }

    nav ul a {
      color: white;
      text-decoration: none;
      font-weight: 500;
      transition: color 0.3s;
    }

    nav ul a:hover {
      color: var(--highlight);
    }

    .container {
      flex: 1;
      max-width: 600px;
      margin: 60px auto;
      padding: 30px;
      background: white;
      border-radius: 16px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    }

    h2 {
      margin-bottom: 25px;
      color: #2c3e50;
      text-align: center;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      background-color: #fef5e7;
    }

    td {
      padding: 12px 10px;
      font-size: 16px;
    }

    input[type="text"],
    input[type="number"] {
      width: 100%;
      padding: 8px;
      font-size: 16px;
      border-radius: 6px;
      border: 1px solid #ccc;
    }

    input[readonly] {
      background-color: #f0f0f0;
    }

    button {
      margin-top: 10px;
      padding: 10px 20px;
      font-size: 16px;
      border: none;
      background-color: var(--primary);
      color: white;
      border-radius: 8px;
      cursor: pointer;
      transition: background 0.3s ease;
    }

    button:hover {
      background-color: var(--highlight);
    }

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

    @media (max-width: 600px) {
      .container {
        margin: 30px 10px;
        padding: 20px;
      }
    }