Glassmorphism Login Form

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

.login-container {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  position: relative;
  overflow: hidden;
}

.background-shapes {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.shape {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  animation: float 6s ease-in-out infinite;
}

.shape-1 {
  width: 200px;
  height: 200px;
  top: 10%;
  left: 10%;
  animation-delay: 0s;
}

.shape-2 {
  width: 150px;
  height: 150px;
  top: 60%;
  right: 10%;
  animation-delay: 2s;
}

.shape-3 {
  width: 100px;
  height: 100px;
  bottom: 20%;
  left: 20%;
  animation-delay: 4s;
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-20px) rotate(180deg);
  }
}

.login-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 20px;
  padding: 2.5rem;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.login-header {
  text-align: center;
  margin-bottom: 2rem;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.logo-icon {
  font-size: 2rem;
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

.logo-text {
  color: white;
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.welcome-text {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.95rem;
  line-height: 1.5;
}

.form-group {
  margin-bottom: 1.5rem;
}

.input-container {
  position: relative;
}

.form-input {
  width: 100%;
  padding: 1rem 1rem 1rem 0;
  background: transparent;
  border: none;
  border-bottom: 2px solid rgba(255, 255, 255, 0.3);
  color: white;
  font-size: 1rem;
  transition: all 0.3s ease;
  outline: none;
}

.form-input:focus {
  border-bottom-color: rgba(255, 255, 255, 0.8);
}

.form-input:focus + .form-label,
.form-input:valid + .form-label {
  transform: translateY(-1.5rem) scale(0.8);
  color: rgba(255, 255, 255, 0.9);
}

.form-label {
  position: absolute;
  top: 1rem;
  left: 0;
  color: rgba(255, 255, 255, 0.6);
  font-size: 1rem;
  transition: all 0.3s ease;
  pointer-events: none;
  transform-origin: left top;
}

.input-highlight {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #fff, rgba(255, 255, 255, 0.8));
  transition: width 0.3s ease;
}

.form-input:focus ~ .input-highlight {
  width: 100%;
}

.password-toggle {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.6);
  cursor: pointer;
  padding: 0.5rem;
  transition: color 0.3s ease;
}

.password-toggle:hover {
  color: rgba(255, 255, 255, 0.9);
}

.error-message {
  color: #ff6b6b;
  font-size: 0.85rem;
  margin-top: 0.5rem;
  opacity: 0;
  transform: translateY(-10px);
  transition: all 0.3s ease;
}

.error-message.show {
  opacity: 1;
  transform: translateY(0);
}

.form-options {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.checkbox-container {
  display: flex;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.checkbox-container input {
  display: none;
}

.checkmark {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-radius: 4px;
  margin-right: 0.5rem;
  position: relative;
  transition: all 0.3s ease;
}

.checkbox-container input:checked + .checkmark {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.8);
}

.checkbox-container input:checked + .checkmark::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 12px;
  font-weight: bold;
}

.checkbox-text {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9rem;
}

.forgot-link {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.3s ease;
}

.forgot-link:hover {
  color: white;
}

.login-button {
  width: 100%;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 12px;
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.login-button:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.login-button:active {
  transform: translateY(0);
}

.button-loader {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border: 2px solid transparent;
  border-top: 2px solid white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.login-button.loading .button-text {
  opacity: 0;
}

.login-button.loading .button-loader {
  opacity: 1;
}

.divider {
  position: relative;
  text-align: center;
  margin: 1.5rem 0;
}

.divider::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: rgba(255, 255, 255, 0.2);
}

.divider-text {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  padding: 0 1rem;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.85rem;
}

.social-login {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.social-button {
  padding: 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  color: white;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.social-button:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

.signup-text {
  text-align: center;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
}

.signup-link {
  color: white;
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s ease;
}

.signup-link:hover {
  color: rgba(255, 255, 255, 0.8);
}

/* Responsive Design */
@media (max-width: 480px) {
  .login-container {
    padding: 1rem;
  }
  
  .login-card {
    padding: 2rem 1.5rem;
  }
  
  .social-login {
    grid-template-columns: 1fr;
  }
}

class GlassmorphismLogin {
  constructor() {
    this.form = document.getElementById('loginForm');
    this.emailInput = document.getElementById('email');
    this.passwordInput = document.getElementById('password');
    this.passwordToggle = document.getElementById('passwordToggle');
    this.loginButton = this.form.querySelector('.login-button');
    
    this.init();
  }
  
  init() {
    this.setupEventListeners();
    this.setupValidation();
  }
  
  setupEventListeners() {
    // Password toggle
    this.passwordToggle.addEventListener('click', () => {
      this.togglePassword();
    });
    
    // Form submission
    this.form.addEventListener('submit', (e) => {
      e.preventDefault();
      this.handleSubmit();
    });
    
    // Input validation on blur
    this.emailInput.addEventListener('blur', () => {
      this.validateEmail();
    });
    
    this.passwordInput.addEventListener('blur', () => {
      this.validatePassword();
    });
    
    // Clear errors on input
    this.emailInput.addEventListener('input', () => {
      this.clearError('emailError');
    });
    
    this.passwordInput.addEventListener('input', () => {
      this.clearError('passwordError');
    });
  }
  
  setupValidation() {
    // Add floating label behavior
    [this.emailInput, this.passwordInput].forEach(input => {
      if (input.value) {
        input.classList.add('has-value');
      }
      
      input.addEventListener('input', () => {
        if (input.value) {
          input.classList.add('has-value');
        } else {
          input.classList.remove('has-value');
        }
      });
    });
  }
  
  togglePassword() {
    const type = this.passwordInput.type === 'password' ? 'text' : 'password';
    this.passwordInput.type = type;
    
    const icon = this.passwordToggle.querySelector('.toggle-icon');
    icon.textContent = type === 'password' ? '👁️' : '🙈';
  }
  
  validateEmail() {
    const email = this.emailInput.value.trim();
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    
    if (!email) {
      this.showError('emailError', 'Email is required');
      return false;
    }
    
    if (!emailRegex.test(email)) {
      this.showError('emailError', 'Please enter a valid email address');
      return false;
    }
    
    this.clearError('emailError');
    return true;
  }
  
  validatePassword() {
    const password = this.passwordInput.value;
    
    if (!password) {
      this.showError('passwordError', 'Password is required');
      return false;
    }
    
    if (password.length < 6) {
      this.showError('passwordError', 'Password must be at least 6 characters');
      return false;
    }
    
    this.clearError('passwordError');
    return true;
  }
  
  showError(elementId, message) {
    const errorElement = document.getElementById(elementId);
    errorElement.textContent = message;
    errorElement.classList.add('show');
  }
  
  clearError(elementId) {
    const errorElement = document.getElementById(elementId);
    errorElement.classList.remove('show');
  }
  
  async handleSubmit() {
    const isEmailValid = this.validateEmail();
    const isPasswordValid = this.validatePassword();
    
    if (!isEmailValid || !isPasswordValid) {
      return;
    }
    
    // Show loading state
    this.loginButton.classList.add('loading');
    this.loginButton.disabled = true;
    
    try {
      // Simulate API call
      await this.simulateLogin();
      
      // Success feedback
      this.showSuccess();
    } catch (error) {
      this.showError('passwordError', 'Invalid credentials. Please try again.');
    } finally {
      // Remove loading state
      this.loginButton.classList.remove('loading');
      this.loginButton.disabled = false;
    }
  }
  
  simulateLogin() {
    return new Promise((resolve, reject) => {
      setTimeout(() => {
        // Simulate success/failure
        const success = Math.random() > 0.3;
        if (success) {
          resolve();
        } else {
          reject(new Error('Login failed'));
        }
      }, 2000);
    });
  }
  
  showSuccess() {
    const buttonText = this.loginButton.querySelector('.button-text');
    buttonText.textContent = 'Success! Redirecting...';
    
    setTimeout(() => {
      buttonText.textContent = 'Sign In';
      // Here you would typically redirect to dashboard
      console.log('Redirecting to dashboard...');
    }, 1500);
  }
}

// Initialize the login form
document.addEventListener('DOMContentLoaded', () => {
  new GlassmorphismLogin();
});