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

  body {
    background: #f6f6f6;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    padding: 20px;
  }

  .container {
    display: flex;
    width: 100%;
    max-width: 900px;
    background: white;
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    animation: fadeIn 1s ease-in-out;
  }

  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .left, .right {
    flex: 1;
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .left {
    background: linear-gradient(to bottom right, #0077e6, #0055cc);
    color: white;
    border-top-left-radius: 20px;
    border-bottom-left-radius: 20px;
    animation: slideInLeft 1s ease-out;
  }

  .right {
    align-items: center;
    animation: slideInRight 1s ease-out;
  }

  @keyframes slideInLeft {
    from { transform: translateX(-50px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
  }

  @keyframes slideInRight {
    from { transform: translateX(50px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
  }

  .left h2 {
    font-size: 28px;
    margin-bottom: 10px;
  }

  .left p {
    font-size: 14px;
    margin-bottom: 30px;
  }

  .input-group {
    margin-bottom: 20px;
    position: relative;
    animation: fadeIn 1.2s ease-in-out;
  }

  .input-group input {
    width: 100%;
    padding: 10px 15px 10px 40px;
    border-radius: 8px;
    border: none;
    outline: none;
    font-size: 14px;
  }

  .input-group::before {
    content: '\1F464';
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 18px;
    color: #aaa;
  }

  .input-group.password::before {
    content: '\1F512';
  }

  .show-button {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #333;
    cursor: pointer;
    font-size: 12px;
  }

  .left button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 8px;
    background-color: orange;
    color: white;
    font-size: 16px;
    cursor: pointer;
    margin-top: 10px;
    transition: background-color 0.3s ease;
  }

  .left button:hover {
    background-color: #e69500;
  }

  .left a {
    text-align: center;
    margin-top: 15px;
    font-size: 12px;
    color: #ddd;
    text-decoration: none;
  }

  .right h3 {
    font-size: 22px;
    margin-bottom: 20px;
    color: #333;
  }

  .right p {
    font-size: 14px;
    text-align: center;
    margin-bottom: 30px;
    color: #555;
  }

  .right a {
    padding: 10px 30px;
    background: #0055cc;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    transition: background-color 0.3s ease;
    text-decoration: none;
  }

  .right a:hover {
    background-color: #003d99;
  }

  .error-message {
    background-color: #ffe0e0;
    color: #a00000;
    padding: 10px 15px;
    border-radius: 8px;
    font-size: 14px;
    margin-bottom: 20px;
    border: 1px solid #ffb3b3;
    animation: fadeIn 0.6s ease-out;
  }

  @media (max-width: 768px) {
    .container {
      flex-direction: column;
      border-radius: 12px;
    }

    .left, .right {
      border-radius: 0;
      padding: 30px;
      align-items: center;
      text-align: center;
    }

    .input-group::before {
      left: 15px;
    }
  }