/* /Global style/ */
  * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'Arial', sans-serif;
  }

  body {
      background-color: #f5f7fa;
      display: flex;
      flex-direction: column;
      /* justify-content: center; */
      align-items: center;
      min-height: 100vh;
      gap: 60px;
  }

  nav {
      width: 100%;
      background: linear-gradient(130deg, #4361ee, #3a0ca3);
      display: flex;
      align-items: center;
      color: white;
      gap: 13px;
  }

  nav img {
      width: 80px;
      height: 70px;
      margin-left: 20px;
  }

  .container {
      display: flex;
      width: 800px;
      background: white;
      border-radius: 10px;
      overflow: hidden;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  }

  .left-panel {
      flex: 1;
      padding: 50px;
      background: linear-gradient(135deg, #4361ee, #3a0ca3);
      color: white;
  }

  .right-panel {
      flex: 1;
      padding: 50px;
  }

  .logo {
      font-size: 28px;
      font-weight: bold;
      margin-bottom: 40px;
      display: flex;
      align-items: center;
  }

  .logo i {
      margin-right: 10px;
      font-size: 32px;
  }

  .welcome-text h1 {
      font-size: 32px;
      margin-bottom: 15px;
  }

  .features {
      margin-top: 40px;
  }

  .feature {
      display: flex;
      align-items: center;
      margin-bottom: 20px;
  }

  .feature i {
      margin-right: 15px;
      font-size: 20px;
      color: #4cc9f0;
  }

  .form-container h2 {
      color: #333;
      margin-bottom: 30px;
      font-size: 28px;
  }

  .input-group {
      margin-bottom: 25px;
  }

  .input-group label {
      display: block;
      margin-bottom: 8px;
      color: #555;
      font-weight: 500;
  }

  .input-group input {
      width: 100%;
      padding: 14px;
      border: 2px solid #e1e5eb;
      border-radius: 8px;
      font-size: 16px;
      transition: border 0.3s;
  }

  .input-group input:focus {
      border-color: #4361ee;
      outline: none;
  }

  .login-btn {
      width: 100%;
      padding: 15px;
      background: #4361ee;
      color: white;
      border: none;
      border-radius: 8px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      transition: background 0.3s;
  }

  .login-btn:hover {
      background: #3a0ca3;
  }

  .signup-link {
      text-align: center;
      margin-top: 20px;
      color: #666;
  }

  .signup-link a {
      color: #4361ee;
      text-decoration: none;
      font-weight: 500;
  }

  .error-message {
      color: #e63946;
      margin-top: 10px;
      display: none;
  }

  /* =====================
   Mobile (≤ 600px)
===================== */
  @media (max-width: 600px) {
      body {
          gap: 20px;
      }

      nav {
          justify-content: start;
      }

      nav img {
          width: 50px;
      }

      nav h2 {
          font-size: 18px;
      }

      .container {
          flex-direction: column;
          border-radius: 5;
      }

      .left-panel {
          text-align: center;
      }

      .features {
          display: none;
          /* hide features for cleaner mobile UI */
      }

      .logo {
          justify-content: center;
      }

      .form-container h2 {
          text-align: center;
      }
  }