body {
      margin: 0;
      font-family: Arial, Helvetica, sans-serif;
      background-color: #f4f4f4;
    }

    header {
      background-color: #1f2937;
      color: #ffffff;
      padding: 1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    header h1 {
      font-size: 1.2rem;
      margin: 0;
    }

    nav {
      display: none;
      flex-direction: column;
      background-color: #111827;
    }

    nav a {
      color: #ffffff;
      padding: 1rem;
      text-decoration: none;
      border-top: 1px solid #374151;
    }

    nav a:hover {
      background-color: #374151;
    }

    .menu-btn {
      font-size: 1.5rem;
      cursor: pointer;
    }

    .container {
      padding: 1rem;
    }

    .login-box {
      max-width: 400px;
      margin: 2rem auto;
      background: #ffffff;
      padding: 2rem;
      border-radius: 8px;
      box-shadow: 0 2px 6px rgba(0,0,0,0.1);
    }

    .login-box h2 {
      margin-bottom: 1rem;
      text-align: center;
    }

    .login-box input {
      width: 100%;
      padding: 0.75rem;
      margin-bottom: 1rem;
      border: 1px solid #d1d5db;
      border-radius: 4px;
    }

    .login-box button {
      width: 100%;
      padding: 0.75rem;
      background-color: #2563eb;
      color: #ffffff;
      border: none;
      border-radius: 4px;
      font-size: 1rem;
      cursor: pointer;
    }

    .login-box button:hover {
      background-color: #1d4ed8;
    }

    .hidden {
      display: none;
    }

    @media (min-width: 768px) {
      nav {
        display: flex !important;
        flex-direction: row;
      }

      nav a {
        border: none;
      }

      .menu-btn {
        display: none;
      }
    }