Morphing Button System

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

.morphing-demo {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  font-family: 'Inter', sans-serif;
  padding: 2rem;
}

.button-container {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
}

.morph-btn {
  position: relative;
  padding: 1rem 2.5rem;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  border: none;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  overflow: hidden;
  min-width: 200px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.morph-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

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

.morph-btn.secondary {
  background: linear-gradient(135deg, #764ba2, #667eea);
}

.morph-btn.outline {
  background: transparent;
  border: 2px solid white;
  color: white;
}

.morph-btn.outline:hover {
  background: rgba(255, 255, 255, 0.1);
}

.btn-text,
.btn-loader,
.btn-success,
.btn-error {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.btn-text {
  opacity: 1;
  visibility: visible;
}

.btn-loader,
.btn-success,
.btn-error {
  opacity: 0;
  visibility: hidden;
}

/* Loading state */
.morph-btn[data-state="loading"] {
  width: 60px;
  border-radius: 50%;
}

.morph-btn[data-state="loading"] .btn-text {
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, -50%) scale(0.8);
}

.morph-btn[data-state="loading"] .btn-loader {
  opacity: 1;
  visibility: visible;
}

/* Success state */
.morph-btn[data-state="success"] {
  background: linear-gradient(135deg, #4ade80, #22c55e);
  width: 60px;
  border-radius: 50%;
}

.morph-btn[data-state="success"] .btn-text,
.morph-btn[data-state="success"] .btn-loader {
  opacity: 0;
  visibility: hidden;
}

.morph-btn[data-state="success"] .btn-success {
  opacity: 1;
  visibility: visible;
  font-size: 1.5rem;
  font-weight: bold;
}

/* Error state */
.morph-btn[data-state="error"] {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  width: 60px;
  border-radius: 50%;
}

.morph-btn[data-state="error"] .btn-text,
.morph-btn[data-state="error"] .btn-loader {
  opacity: 0;
  visibility: hidden;
}

.morph-btn[data-state="error"] .btn-error {
  opacity: 1;
  visibility: visible;
  font-size: 1.5rem;
  font-weight: bold;
}

/* Loader animation */
.circular {
  width: 24px;
  height: 24px;
  animation: rotate 2s linear infinite;
}

.path {
  stroke: currentColor;
  stroke-linecap: round;
  animation: dash 1.5s ease-in-out infinite;
}

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

@keyframes dash {
  0% {
    stroke-dasharray: 1, 150;
    stroke-dashoffset: 0;
  }
  50% {
    stroke-dasharray: 90, 150;
    stroke-dashoffset: -35;
  }
  100% {
    stroke-dasharray: 90, 150;
    stroke-dashoffset: -124;
  }
}

.btn-examples {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

@media (max-width: 768px) {
  .morphing-demo {
    padding: 1rem;
  }
  
  .btn-examples {
    flex-direction: column;
    align-items: center;
  }
  
  .morph-btn {
    min-width: 180px;
    height: 50px;
    font-size: 0.9rem;
  }
}

class MorphingButtonSystem {
  constructor() {
    this.buttons = document.querySelectorAll('.morph-btn');
    this.init();
  }
  
  init() {
    this.buttons.forEach(button => {
      button.addEventListener('click', (e) => this.handleButtonClick(e));
    });
  }
  
  handleButtonClick(event) {
    const button = event.currentTarget;
    const currentState = button.dataset.state;
    
    if (currentState === 'idle') {
      this.startProcess(button);
    } else if (currentState === 'success' || currentState === 'error') {
      this.resetButton(button);
    }
  }
  
  startProcess(button) {
    // Set loading state
    this.setState(button, 'loading');
    
    // Simulate async process
    const duration = Math.random() * 2000 + 1000; // 1-3 seconds
    const success = Math.random() > 0.3; // 70% success rate
    
    setTimeout(() => {
      if (success) {
        this.setState(button, 'success');
        // Auto reset after 2 seconds
        setTimeout(() => this.resetButton(button), 2000);
      } else {
        this.setState(button, 'error');
        // Auto reset after 2 seconds
        setTimeout(() => this.resetButton(button), 2000);
      }
    }, duration);
  }
  
  setState(button, state) {
    button.dataset.state = state;
    
    // Add ripple effect for state changes
    this.addRippleEffect(button);
    
    // Trigger haptic feedback if available
    if (navigator.vibrate) {
      if (state === 'success') {
        navigator.vibrate([50, 50, 50]);
      } else if (state === 'error') {
        navigator.vibrate([100, 50, 100]);
      }
    }
  }
  
  resetButton(button) {
    this.setState(button, 'idle');
  }
  
  addRippleEffect(button) {
    const ripple = document.createElement('span');
    const rect = button.getBoundingClientRect();
    const size = Math.max(rect.width, rect.height);
    const x = rect.width / 2;
    const y = rect.height / 2;
    
    ripple.style.cssText = `
      position: absolute;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.3);
      transform: scale(0);
      animation: ripple 0.6s linear;
      left: ${x - size / 2}px;
      top: ${y - size / 2}px;
      width: ${size}px;
      height: ${size}px;
      pointer-events: none;
    `;
    
    button.appendChild(ripple);
    
    setTimeout(() => {
      ripple.remove();
    }, 600);
  }
}

// Add ripple animation CSS
const style = document.createElement('style');
style.textContent = `
  @keyframes ripple {
    to {
      transform: scale(4);
      opacity: 0;
    }
  }
`;
document.head.appendChild(style);

// Initialize when DOM is loaded
document.addEventListener('DOMContentLoaded', () => {
  new MorphingButtonSystem();
});