body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f5f5f5;
  }
  
  .container {
    max-width: 600px;
    margin: 50px auto;
    padding: 30px;
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  }
  
  .logo-container {
    margin-bottom: 20px;
  }
  
  .logo {
    max-height: 80px;
    width: auto;
  }
  
  .header {
    text-align: center;
    margin-bottom: 30px;
  }
  
  .header h2 {
    color: #4285f4;
    margin-bottom: 10px;
  }
  
  .form-group {
    margin-bottom: 20px;
  }
  
  label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
  }
  
  .form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
  }
  
  .btn-primary {
    background-color: #4285f4;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    width: 100%;
  }
  
  .btn-primary:hover {
    background-color: #3367d6;
  }
  
  .error-message {
    display: none;
    color: #dc3545;
    margin-top: 15px;
    padding: 10px;
    background-color: #f8d7da;
    border-radius: 4px;
    font-size: 14px;
  }
  
  .success-message {
    display: none;
    color: #28a745;
    margin-top: 15px;
    padding: 10px;
    background-color: #d4edda;
    border-radius: 4px;
    font-size: 14px;
  }
  
  .toggle-link {
    text-align: center;
    margin-top: 20px;
    font-size: 14px;
  }
  
  .toggle-link a {
    color: #4285f4;
    text-decoration: none;
  }
  
  .toggle-link a:hover {
    text-decoration: underline;
  }

  /* ===== Dark Mode ===== */
  body.dark-mode {
    background-color: #0d0d0d;
    color: #e0e0e0;
  }
  body.dark-mode .container {
    background-color: #141414;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    color: #e0e0e0;
  }
  body.dark-mode .header h2 {
    color: #66BB6A;
  }
  body.dark-mode .header p {
    color: #aaa;
  }
  body.dark-mode label {
    color: #ccc;
  }
  body.dark-mode .form-control {
    background-color: #1a1a1a;
    border-color: #333;
    color: #e0e0e0;
  }
  body.dark-mode .error-message {
    background-color: #2a1010;
    color: #ef5350;
  }
  body.dark-mode .success-message {
    background-color: #1a2e1a;
    color: #66BB6A;
  }
  body.dark-mode .toggle-link a {
    color: #66BB6A;
  }