* {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: 'Segoe UI', sans-serif;
    }

    body {
      background: #f0f4f8;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      background-image: url(https://wallpaperaccess.com/full/4029897.jpg);
      background-repeat: no-repeat;
      background-size: cover;
    }

    .container {
      width: 350px;
      background: white;
      padding: 30px;
      border-radius: 16px;
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    }

    .tabs {
      display: flex;
      justify-content: space-around;
      margin-bottom: 25px;
    }

    .tabs button {
      flex: 1;
      padding: 10px;
      border: none;
      background: none;
      font-size: 16px;
      font-weight: bold;
      color: #888;
      cursor: pointer;
      border-bottom: 3px solid transparent;
      transition: all 0.3s ease;
    }

    .tabs button.active {
      color: #00C2CB;
      border-color: #00C2CB;
    }

    form {
      display: none;
      flex-direction: column;
    }

    form.active {
      display: flex;
    }

    input {
      margin-bottom: 15px;
      padding: 10px;
      border: 1px solid #ccc;
      border-radius: 8px;
      outline: none;
      font-size: 14px;
    }

    button.submit-btn {
      background: #00C2CB;
      color: white;
      border: none;
      padding: 10px;
      border-radius: 8px;
      cursor: pointer;
      font-weight: bold;
      transition: background 0.3s ease;
    }

    button.submit-btn:hover {
      background: #0099a3;
    }

    .message {
      margin-top: 10px;
      font-size: 14px;
      color: #666;
      text-align: center;
    }

    @media (max-width: 400px) {
      .container {
        width: 90%;
        padding: 20px;
      }
    }