Formulario de Inicio de Sesión Animado

                .login-form-container {
  background: linear-gradient(135deg, #f8f9ff 0%, #ffffff 100%);
  padding: 40px 20px;
  border-radius: 20px;
  max-width: 500px;
  margin: 0 auto;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.05);
}

.login-form-demo {
  background: white;
  border-radius: 15px;
  padding: 30px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.03);
}

.form-wrapper {
  animation: slideInUp 0.6s ease-out;
}

.form-header {
  text-align: center;
  margin-bottom: 30px;
}

.form-header h2 {
  margin: 0 0 10px 0;
  color: #333;
  font-size: 2rem;
  font-weight: 700;
}

.form-header p {
  color: #666;
  font-size: 1.1rem;
  margin: 0;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  animation: fadeIn 0.6s ease-out;
}

.form-group:nth-child(1) { animation-delay: 0.1s; }
.form-group:nth-child(2) { animation-delay: 0.2s; }

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: #333;
  font-size: 0.95rem;
}

.input-wrapper {
  position: relative;
}

.input-wrapper input {
  width: 100%;
  padding: 15px 50px 15px 50px;
  border: 2px solid #e2e8f0;
  border-radius: 12px;
  font-size: 1rem;
  transition: all 0.3s ease;
  box-sizing: border-box;
}

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

.input-wrapper input.valid {
  border-color: #27ae60;
  background: rgba(39, 174, 96, 0.05);
}

.input-wrapper input.invalid {
  border-color: #e74c3c;
  background: rgba(231, 76, 60, 0.05);
}

.input-icon {
  position: absolute;
  left: 15px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.2rem;
  color: #999;
}

.input-wrapper input:focus + .input-icon {
  color: #667eea;
}

.input-wrapper input.valid + .input-icon {
  color: #27ae60;
}

.input-wrapper input.invalid + .input-icon {
  color: #e74c3c;
}

.toggle-password {
  position: absolute;
  right: 15px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  font-size: 1.2rem;
  color: #999;
  cursor: pointer;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.3s ease;
}

.toggle-password:hover {
  color: #667eea;
  background: rgba(102, 126, 234, 0.1);
}

.form-options {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 0.9rem;
  color: #666;
}

.checkbox-label input {
  display: none;
}

.checkmark {
  width: 20px;
  height: 20px;
  border: 2px solid #e2e8f0;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.checkbox-label input:checked + .checkmark {
  background: #667eea;
  border-color: #667eea;
}

.checkbox-label input:checked + .checkmark::after {
  content: '✓';
  color: white;
  font-size: 12px;
}

.forgot-password {
  color: #667eea;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.3s ease;
}

.forgot-password:hover {
  color: #5a6fd8;
  text-decoration: underline;
}

.btn {
  padding: 16px;
  border: none;
  border-radius: 12px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.6);
}

.btn-primary:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-text {
  transition: opacity 0.3s ease;
}

.btn.loading .btn-text {
  opacity: 0;
}

.btn-spinner {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 24px;
  height: 24px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top: 3px solid white;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity 0.3s ease;
  animation: spin 1s linear infinite;
}

.btn.loading .btn-spinner {
  opacity: 1;
}

.divider {
  display: flex;
  align-items: center;
  gap: 15px;
  margin: 10px 0;
}

.divider span {
  color: #999;
  font-size: 0.9rem;
  white-space: nowrap;
}

.divider::before,
.divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: #e2e8f0;
}

.social-login {
  display: flex;
  gap: 15px;
  margin-bottom: 20px;
}

.social-btn {
  flex: 1;
  padding: 12px;
  border: 2px solid #e2e8f0;
  border-radius: 12px;
  background: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.3s ease;
  font-weight: 600;
}

.social-btn:hover {
  transform: translateY(-2px);
  border-color: #667eea;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.social-icon {
  font-size: 1.2rem;
}

.social-text {
  color: #333;
  font-size: 0.9rem;
}

.social-btn.google:hover {
  border-color: #db4437;
}

.social-btn.facebook:hover {
  border-color: #3b5998;
}

.social-btn.apple:hover {
  border-color: #000000;
}

.signup-link {
  text-align: center;
  color: #666;
  font-size: 0.95rem;
}

.signup-link a {
  color: #667eea;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
}

.signup-link a:hover {
  color: #5a6fd8;
  text-decoration: underline;
}@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spin {
  0% { transform: translate(-50%, -50%) rotate(0deg); }
  100% { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-5px); }
  40%, 80% { transform: translateX(5px); }
}

.shake {
  animation: shake 0.5s ease-in-out;
}@media (max-width: 768px) {
  .login-form-container {
    padding: 30px 15px;
  }
  
  .login-form-demo {
    padding: 25px;
  }
  
  .form-header h2 {
    font-size: 1.7rem;
  }
  
  .input-wrapper input {
    padding: 12px 45px 12px 45px;
  }
  
  .input-icon,
  .toggle-password {
    font-size: 1rem;
  }
  
  .social-login {
    flex-direction: column;
    gap: 10px;
  }
  
  .social-btn {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .form-options {
    flex-direction: column;
    align-items: flex-start;
    gap: 15px;
  }
  
  .forgot-password {
    align-self: flex-end;
  }
}

              

                document.addEventListener('DOMContentLoaded', function() {

  const loginForm = document.getElementById('loginForm');
  const emailInput = document.getElementById('email');
  const passwordInput = document.getElementById('password');
  const togglePassword = document.getElementById('togglePassword');
  const loginBtn = document.getElementById('loginBtn');
  const loginSpinner = document.getElementById('loginSpinner');
  const googleBtn = document.querySelector('.social-btn.google');
  const facebookBtn = document.querySelector('.social-btn.facebook');
  const appleBtn = document.querySelector('.social-btn.apple');
  const forgotPassword = document.querySelector('.forgot-password');

  togglePassword.addEventListener('click', function() {
    const type = passwordInput.getAttribute('type') === 'password' ? 'text' : 'password';
    passwordInput.setAttribute('type', type);
    this.textContent = type === 'password' ? '👁️' : '🔒';
  });

  emailInput.addEventListener('input', validateEmail);
  passwordInput.addEventListener('input', validatePassword);

  loginForm.addEventListener('submit', function(e) {
    e.preventDefault();

    const isEmailValid = validateEmail();
    const isPasswordValid = validatePassword();
    
    if (isEmailValid && isPasswordValid) {

      loginBtn.classList.add('loading');
      loginBtn.disabled = true;

      setTimeout(() => {

        const email = emailInput.value;
        const password = passwordInput.value;

        if (email === 'demo@example.com' && password === 'demo123') {
          alert('¡Inicio de sesión exitoso! Bienvenido de nuevo.');


        } else {
          alert('Credenciales inválidas. Por favor intenta de nuevo.');

          loginForm.classList.add('shake');
          setTimeout(() => {
            loginForm.classList.remove('shake');
          }, 500);
        }

        loginBtn.classList.remove('loading');
        loginBtn.disabled = false;
      }, 2000);
    } else {

      if (!isEmailValid) {
        emailInput.classList.add('shake');
        setTimeout(() => {
          emailInput.classList.remove('shake');
        }, 500);
      }
      
      if (!isPasswordValid) {
        passwordInput.classList.add('shake');
        setTimeout(() => {
          passwordInput.classList.remove('shake');
        }, 500);
      }
    }
  });

  function validateEmail() {
    const email = emailInput.value.trim();
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+\$/;
    
    if (email === '') {
      emailInput.classList.remove('valid');
      emailInput.classList.add('invalid');
      return false;
    } else if (!emailRegex.test(email)) {
      emailInput.classList.remove('valid');
      emailInput.classList.add('invalid');
      return false;
    } else {
      emailInput.classList.remove('invalid');
      emailInput.classList.add('valid');
      return true;
    }
  }

  function validatePassword() {
    const password = passwordInput.value;
    
    if (password === '') {
      passwordInput.classList.remove('valid');
      passwordInput.classList.add('invalid');
      return false;
    } else if (password.length < 6) {
      passwordInput.classList.remove('valid');
      passwordInput.classList.add('invalid');
      return false;
    } else {
      passwordInput.classList.remove('invalid');
      passwordInput.classList.add('valid');
      return true;
    }
  }

  googleBtn.addEventListener('click', function() {
    simulateSocialLogin('Google');
  });
  
  facebookBtn.addEventListener('click', function() {
    simulateSocialLogin('Facebook');
  });
  
  appleBtn.addEventListener('click', function() {
    simulateSocialLogin('Apple');
  });

  function simulateSocialLogin(provider) {
    loginBtn.classList.add('loading');
    loginBtn.disabled = true;
    
    setTimeout(() => {
      alert(`Iniciando sesión con \${provider}...`);
      loginBtn.classList.remove('loading');
      loginBtn.disabled = false;

    }, 1500);
  }

  forgotPassword.addEventListener('click', function(e) {
    e.preventDefault();
    alert('La funcionalidad de restablecimiento de contraseña se implementaría aquí.');

  });

  const signupLink = document.querySelector('.signup-link a');
  signupLink.addEventListener('click', function(e) {
    e.preventDefault();
    alert('La página de registro se abriría aquí.');

  });

  document.addEventListener('keydown', function(e) {
    if (e.key === 'Enter') {

      if (document.activeElement === emailInput || document.activeElement === passwordInput) {
        loginForm.dispatchEvent(new Event('submit'));
      }
    }
  });
});