html, body {
      height: 100%;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: Arial, sans-serif;
      background-color: #f6f6f6;
    }
    .container {
      display: flex;
      min-height: 100vh;
      height: 100%;
    }
    .left-panel, .right-panel {
      width: 50%;
      flex: none;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 40px;
      box-sizing: border-box;
    }
    .left-panel { background: #f6f6f6; }
    h2 { margin: 0; font-size: 28px; font-weight: 700; }
    .subtitle { margin: 5px 0 20px; color: #555; }
    form { width: 100%; }
    input[type="text"], input[type="email"], input[type="password"] {
      width: 100%;
      box-sizing: border-box;
      padding: 12px;
      margin: 8px 0;
      border: 1px solid #ddd;
      border-radius: 5px;
    }
    .form-row {
      display: flex;
      gap: 10px;
    }
    .form-row input { flex: 1; }
    .show-wrap {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-top: 10px;
      user-select: none;
    }
    .show-wrap input[type="checkbox"] {
      width: 16px;
      height: 16px;
      margin: 0;
    }
    .show-password { 
      font-size: 14px; 
      color: #444; 
      cursor: pointer;
    }
    .actions { margin-top: 20px; display: flex; align-items: center; gap: 15px; }
    .signin { color: #4CAF50; text-decoration: none; font-size: 14px; }
    .btn {
      background: #4CAF50; border: none; padding: 12px 20px; border-radius: 5px;
      color: #fff; cursor: pointer; font-weight: bold;
    }
    .btn:hover { background: #43a047; }
    .help { margin-top: 30px; font-size: 14px; }
    .help a { color: #4CAF50; text-decoration: none; }

    .right-panel {
      background: #fff;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
      padding: 60px 20px;
    }
    .logo {
      max-width: 33%;
      height: auto;
      display: block;
      margin: 25px 0;
    }

    /* Responsive */
    @media (max-width: 768px) {
      .container { flex-direction: column; height: auto; }
      .left-panel { max-width: 100%; width: 100%; padding: 20px; }
      .right-panel { padding: 40px 20px; justify-content: center; }
      .logo { max-width: 130px; margin: 20px auto; }
    }