* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      margin: 0;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      overflow: hidden;
    }

    .card {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      padding: 40px;
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
      max-width: 400px;
      width: 100%;
      text-align: center;
      border: 1px solid rgba(255, 255, 255, 0.2);
    }

    .card h1 {
      font-size: 36px;
      font-weight: 900;
      margin-bottom: 8px;
      background: linear-gradient(135deg, #667eea, #764ba2);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .subtitle {
      color: #666;
      margin-bottom: 30px;
      font-size: 14px;
    }

    .toggle-buttons {
      display: flex;
      margin-bottom: 30px;
      border-radius: 12px;
      overflow: hidden;
      box-shadow: 0 4px 15px rgba(0,0,0,0.1);
      background: #f8f9fa;
    }

    .toggle-buttons button {
      flex: 1;
      padding: 15px;
      border: none;
      background: transparent;
      cursor: pointer;
      transition: all 0.3s ease;
      font-weight: 600;
      font-size: 14px;
      color: #666;
      position: relative;
    }

    .toggle-buttons button.active {
      background: linear-gradient(135deg, #667eea, #764ba2);
      color: #fff;
      transform: translateY(-2px);
      box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    }

    .form-group {
      text-align: left;
      margin-bottom: 20px;
      position: relative;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
      color: #333;
    }

    .form-group input {
      width: 100%;
      padding: 15px;
      border-radius: 12px;
      border: 2px solid #e1e5e9;
      font-size: 14px;
      transition: all 0.3s ease;
      background: #f8f9fa;
    }

    .form-group input:focus {
      outline: none;
      border-color: #667eea;
      background: #fff;
      box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    }

    .form-group input::placeholder {
      color: #999;
    }

    .btn-continue {
      margin-top: 25px;
      width: 100%;
      padding: 15px;
      border: none;
      border-radius: 12px;
      background: linear-gradient(135deg, #667eea, #764ba2);
      color: white;
      font-weight: bold;
      font-size: 16px;
      cursor: pointer;
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 10px;
      transition: all 0.3s ease;
      box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    }

    .btn-continue:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(102, 126, 234, 0.6);
    }

    .btn-continue:active {
      transform: translateY(0);
    }

    .btn-continue:disabled {
      opacity: 0.6;
      cursor: not-allowed;
      transform: none;
    }

    .hidden {
      display: none;
    }

    .loading {
      display: none;
      width: 20px;
      height: 20px;
      border: 2px solid #ffffff;
      border-top: 2px solid transparent;
      border-radius: 50%;
      animation: spin 1s linear infinite;
    }

    @keyframes spin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }

    /* Alert Styles */
    .alert {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      min-width: 300px;
      max-width: 500px;
      padding: 15px 20px;
      border-radius: 12px;
      font-weight: 600;
      text-align: center;
      z-index: 9999;
      opacity: 0;
      transition: all 0.3s ease;
      box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    }

    .alert.show {
      opacity: 1;
      transform: translateX(-50%) translateY(10px);
    }

    .alert.success {
      background: linear-gradient(135deg, #48bb78, #38a169);
      color: white;
    }

    .alert.error {
      background: linear-gradient(135deg, #f56565, #e53e3e);
      color: white;
    }

    /* Animations */
    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(30px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .card {
      animation: fadeInUp 0.6s ease-out;
    }

    /* Responsive */
    @media (max-width: 480px) {
      .card {
        margin: 20px;
        padding: 30px 20px;
      }
      
      .card h1 {
        font-size: 28px;
      }
    }

    /* Password strength indicator */
    .password-strength {
      height: 4px;
      background: #e1e5e9;
      border-radius: 2px;
      margin-top: 5px;
      overflow: hidden;
    }

    .password-strength-bar {
      height: 100%;
      transition: all 0.3s ease;
      border-radius: 2px;
    }

    .strength-weak { background: #f56565; width: 33%; }
    .strength-medium { background: #ed8936; width: 66%; }
    .strength-strong { background: #48bb78; width: 100%; }