Modern Testimonial Slider

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

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

.testimonial-slider {
  max-width: 900px;
  width: 100%;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 24px;
  padding: 3rem;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
  position: relative;
  overflow: hidden;
}

.testimonial-slider::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
}

.testimonial-header {
  text-align: center;
  margin-bottom: 3rem;
}

.slider-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: white;
  margin-bottom: 0.5rem;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.slider-subtitle {
  font-size: 1.1rem;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 400;
}

.testimonial-wrapper {
  position: relative;
  overflow: hidden;
  border-radius: 16px;
  margin-bottom: 2rem;
}

.testimonial-track {
  display: flex;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

.testimonial-slide {
  min-width: 100%;
  opacity: 0;
  transform: scale(0.95);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.testimonial-slide.active {
  opacity: 1;
  transform: scale(1);
}

.testimonial-card {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 2.5rem;
  position: relative;
  min-height: 300px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.quote-icon {
  position: absolute;
  top: -10px;
  left: 20px;
  font-size: 4rem;
  color: rgba(255, 255, 255, 0.2);
  font-family: Georgia, serif;
  line-height: 1;
}

.testimonial-content {
  position: relative;
  z-index: 2;
}

.testimonial-text {
  font-size: 1.2rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: 2rem;
  font-style: italic;
  text-align: center;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.author-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  overflow: hidden;
  border: 3px solid rgba(255, 255, 255, 0.3);
  flex-shrink: 0;
}

.author-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.author-info {
  flex: 1;
}

.author-name {
  font-size: 1.1rem;
  font-weight: 600;
  color: white;
  margin-bottom: 0.25rem;
}

.author-title {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 0.5rem;
}

.rating {
  display: flex;
  gap: 0.2rem;
}

.star {
  color: #ffd700;
  font-size: 1rem;
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

.testimonial-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.control-btn {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.control-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.1);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.control-btn:active {
  transform: scale(0.95);
}

.control-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.testimonial-dots {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  border: none;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
}

.dot.active {
  background: white;
  transform: scale(1.2);
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.dot:hover {
  background: rgba(255, 255, 255, 0.6);
  transform: scale(1.1);
}

.autoplay-controls {
  display: flex;
  justify-content: center;
}

.autoplay-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 25px;
  color: white;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.autoplay-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.play-icon {
  font-size: 1rem;
}

/* Loading Animation */
.testimonial-slide.loading {
  position: relative;
}

.testimonial-slide.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 40px;
  height: 40px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-top: 3px solid white;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  animation: spin 1s linear infinite;
}

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

/* Slide Animations */
.testimonial-slide.slide-in-right {
  animation: slideInRight 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.testimonial-slide.slide-in-left {
  animation: slideInLeft 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.testimonial-slide.slide-out-left {
  animation: slideOutLeft 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.testimonial-slide.slide-out-right {
  animation: slideOutRight 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes slideInRight {
  from {
    transform: translateX(100%) scale(0.95);
    opacity: 0;
  }
  to {
    transform: translateX(0) scale(1);
    opacity: 1;
  }
}

@keyframes slideInLeft {
  from {
    transform: translateX(-100%) scale(0.95);
    opacity: 0;
  }
  to {
    transform: translateX(0) scale(1);
    opacity: 1;
  }
}

@keyframes slideOutLeft {
  from {
    transform: translateX(0) scale(1);
    opacity: 1;
  }
  to {
    transform: translateX(-100%) scale(0.95);
    opacity: 0;
  }
}

@keyframes slideOutRight {
  from {
    transform: translateX(0) scale(1);
    opacity: 1;
  }
  to {
    transform: translateX(100%) scale(0.95);
    opacity: 0;
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .testimonial-slider-container {
    padding: 1rem;
  }
  
  .testimonial-slider {
    padding: 2rem;
  }
  
  .slider-title {
    font-size: 2rem;
  }
  
  .testimonial-card {
    padding: 2rem;
    min-height: 250px;
  }
  
  .testimonial-text {
    font-size: 1.1rem;
  }
  
  .testimonial-author {
    flex-direction: column;
    text-align: center;
    gap: 0.75rem;
  }
  
  .author-avatar {
    width: 50px;
    height: 50px;
  }
  
  .control-btn {
    width: 45px;
    height: 45px;
  }
  
  .testimonial-controls {
    flex-direction: column;
    gap: 1rem;
  }
}

@media (max-width: 480px) {
  .testimonial-slider {
    padding: 1.5rem;
  }
  
  .slider-title {
    font-size: 1.75rem;
  }
  
  .testimonial-card {
    padding: 1.5rem;
  }
  
  .testimonial-text {
    font-size: 1rem;
  }
  
  .quote-icon {
    font-size: 3rem;
  }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
  .testimonial-slider {
    background: rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.1);
  }
  
  .testimonial-card {
    background: rgba(0, 0, 0, 0.2);
  }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  .testimonial-track,
  .testimonial-slide,
  .control-btn,
  .dot,
  .autoplay-btn {
    transition: none;
  }
  
  .testimonial-slide.slide-in-right,
  .testimonial-slide.slide-in-left,
  .testimonial-slide.slide-out-left,
  .testimonial-slide.slide-out-right {
    animation: none;
  }
}

class TestimonialSlider {
  constructor(container) {
    this.container = container || document.querySelector('.testimonial-slider');
    this.track = this.container.querySelector('.testimonial-track');
    this.slides = this.container.querySelectorAll('.testimonial-slide');
    this.dots = this.container.querySelectorAll('.dot');
    this.prevBtn = this.container.querySelector('.prev-btn');
    this.nextBtn = this.container.querySelector('.next-btn');
    this.autoplayBtn = this.container.querySelector('.autoplay-btn');
    this.playIcon = this.autoplayBtn.querySelector('.play-icon');
    
    this.currentSlide = 0;
    this.isAutoplay = true;
    this.autoplayInterval = null;
    this.autoplayDelay = 5000;
    this.isTransitioning = false;
    this.touchStartX = 0;
    this.touchEndX = 0;
    
    this.init();
  }
  
  init() {
    this.setupEventListeners();
    this.startAutoplay();
    this.updateSlider();
    this.setupTouchEvents();
    this.setupKeyboardNavigation();
  }
  
  setupEventListeners() {
    // Navigation buttons
    this.prevBtn.addEventListener('click', () => this.previousSlide());
    this.nextBtn.addEventListener('click', () => this.nextSlide());
    
    // Dot navigation
    this.dots.forEach((dot, index) => {
      dot.addEventListener('click', () => this.goToSlide(index));
    });
    
    // Autoplay toggle
    this.autoplayBtn.addEventListener('click', () => this.toggleAutoplay());
    
    // Pause on hover
    this.container.addEventListener('mouseenter', () => this.pauseAutoplay());
    this.container.addEventListener('mouseleave', () => this.resumeAutoplay());
    
    // Visibility API for performance
    document.addEventListener('visibilitychange', () => {
      if (document.hidden) {
        this.pauseAutoplay();
      } else if (this.isAutoplay) {
        this.resumeAutoplay();
      }
    });
  }
  
  setupTouchEvents() {
    this.container.addEventListener('touchstart', (e) => {
      this.touchStartX = e.changedTouches[0].screenX;
    }, { passive: true });
    
    this.container.addEventListener('touchend', (e) => {
      this.touchEndX = e.changedTouches[0].screenX;
      this.handleSwipe();
    }, { passive: true });
  }
  
  setupKeyboardNavigation() {
    this.container.addEventListener('keydown', (e) => {
      switch (e.key) {
        case 'ArrowLeft':
          e.preventDefault();
          this.previousSlide();
          break;
        case 'ArrowRight':
          e.preventDefault();
          this.nextSlide();
          break;
        case ' ':
          e.preventDefault();
          this.toggleAutoplay();
          break;
        case 'Home':
          e.preventDefault();
          this.goToSlide(0);
          break;
        case 'End':
          e.preventDefault();
          this.goToSlide(this.slides.length - 1);
          break;
      }
    });
    
    // Make container focusable
    this.container.setAttribute('tabindex', '0');
  }
  
  handleSwipe() {
    const swipeThreshold = 50;
    const diff = this.touchStartX - this.touchEndX;
    
    if (Math.abs(diff) > swipeThreshold) {
      if (diff > 0) {
        this.nextSlide();
      } else {
        this.previousSlide();
      }
    }
  }
  
  nextSlide() {
    if (this.isTransitioning) return;
    
    const nextIndex = (this.currentSlide + 1) % this.slides.length;
    this.goToSlide(nextIndex, 'next');
  }
  
  previousSlide() {
    if (this.isTransitioning) return;
    
    const prevIndex = this.currentSlide === 0 ? this.slides.length - 1 : this.currentSlide - 1;
    this.goToSlide(prevIndex, 'prev');
  }
  
  goToSlide(index, direction = 'next') {
    if (this.isTransitioning || index === this.currentSlide) return;
    
    this.isTransitioning = true;
    const currentSlideEl = this.slides[this.currentSlide];
    const nextSlideEl = this.slides[index];
    
    // Add animation classes
    if (direction === 'next') {
      currentSlideEl.classList.add('slide-out-left');
      nextSlideEl.classList.add('slide-in-right');
    } else {
      currentSlideEl.classList.add('slide-out-right');
      nextSlideEl.classList.add('slide-in-left');
    }
    
    // Update current slide
    this.currentSlide = index;
    
    // Clean up after animation
    setTimeout(() => {
      this.updateSlider();
      this.cleanupAnimationClasses();
      this.isTransitioning = false;
    }, 600);
  }
  
  updateSlider() {
    // Update active slide
    this.slides.forEach((slide, index) => {
      slide.classList.toggle('active', index === this.currentSlide);
    });
    
    // Update active dot
    this.dots.forEach((dot, index) => {
      dot.classList.toggle('active', index === this.currentSlide);
    });
    
    // Update navigation buttons
    this.updateNavigationButtons();
    
    // Update ARIA attributes
    this.updateAriaAttributes();
  }
  
  cleanupAnimationClasses() {
    this.slides.forEach(slide => {
      slide.classList.remove(
        'slide-in-left', 'slide-in-right',
        'slide-out-left', 'slide-out-right'
      );
    });
  }
  
  updateNavigationButtons() {
    // Enable/disable buttons based on current position (optional)
    // For infinite loop, keep all buttons enabled
    this.prevBtn.disabled = false;
    this.nextBtn.disabled = false;
  }
  
  updateAriaAttributes() {
    this.slides.forEach((slide, index) => {
      slide.setAttribute('aria-hidden', index !== this.currentSlide);
    });
    
    this.dots.forEach((dot, index) => {
      dot.setAttribute('aria-pressed', index === this.currentSlide);
    });
  }
  
  startAutoplay() {
    if (!this.isAutoplay) return;
    
    this.autoplayInterval = setInterval(() => {
      this.nextSlide();
    }, this.autoplayDelay);
  }
  
  stopAutoplay() {
    if (this.autoplayInterval) {
      clearInterval(this.autoplayInterval);
      this.autoplayInterval = null;
    }
  }
  
  pauseAutoplay() {
    this.stopAutoplay();
  }
  
  resumeAutoplay() {
    if (this.isAutoplay) {
      this.startAutoplay();
    }
  }
  
  toggleAutoplay() {
    this.isAutoplay = !this.isAutoplay;
    
    if (this.isAutoplay) {
      this.startAutoplay();
      this.playIcon.textContent = '⏸️';
    } else {
      this.stopAutoplay();
      this.playIcon.textContent = '▶️';
    }
  }
  
  // Public API methods
  getCurrentSlide() {
    return this.currentSlide;
  }
  
  getTotalSlides() {
    return this.slides.length;
  }
  
  setAutoplayDelay(delay) {
    this.autoplayDelay = delay;
    if (this.isAutoplay) {
      this.stopAutoplay();
      this.startAutoplay();
    }
  }
  
  addSlide(slideHTML) {
    const slideElement = document.createElement('div');
    slideElement.className = 'testimonial-slide';
    slideElement.innerHTML = slideHTML;
    
    this.track.appendChild(slideElement);
    this.slides = this.container.querySelectorAll('.testimonial-slide');
    
    // Add corresponding dot
    const dot = document.createElement('button');
    dot.className = 'dot';
    dot.setAttribute('data-slide', this.slides.length - 1);
    dot.addEventListener('click', () => this.goToSlide(this.slides.length - 1));
    
    this.container.querySelector('.testimonial-dots').appendChild(dot);
    this.dots = this.container.querySelectorAll('.dot');
  }
  
  removeSlide(index) {
    if (index >= 0 && index < this.slides.length) {
      this.slides[index].remove();
      this.dots[index].remove();
      
      this.slides = this.container.querySelectorAll('.testimonial-slide');
      this.dots = this.container.querySelectorAll('.dot');
      
      if (this.currentSlide >= this.slides.length) {
        this.currentSlide = this.slides.length - 1;
      }
      
      this.updateSlider();
    }
  }
  
  // Performance monitoring
  getPerformanceMetrics() {
    return {
      currentSlide: this.currentSlide,
      totalSlides: this.slides.length,
      isAutoplay: this.isAutoplay,
      autoplayDelay: this.autoplayDelay,
      isTransitioning: this.isTransitioning
    };
  }
  
  // Cleanup method
  destroy() {
    this.stopAutoplay();
    
    // Remove event listeners
    this.prevBtn.removeEventListener('click', this.previousSlide);
    this.nextBtn.removeEventListener('click', this.nextSlide);
    this.autoplayBtn.removeEventListener('click', this.toggleAutoplay);
    
    this.dots.forEach(dot => {
      dot.removeEventListener('click', this.goToSlide);
    });
    
    // Clean up touch events
    this.container.removeEventListener('touchstart', this.handleTouchStart);
    this.container.removeEventListener('touchend', this.handleTouchEnd);
    
    // Clean up keyboard events
    this.container.removeEventListener('keydown', this.handleKeydown);
  }
}

// Utility function for creating testimonials
function createTestimonial(config) {
  return `
    <div class="testimonial-card">
      <div class="quote-icon">"</div>
      <div class="testimonial-content">
        <p class="testimonial-text">${config.text}</p>
        <div class="testimonial-author">
          <div class="author-avatar">
            <img src="${config.avatar}" alt="${config.name}" />
          </div>
          <div class="author-info">
            <h4 class="author-name">${config.name}</h4>
            <p class="author-title">${config.title}</p>
            <div class="rating">
              ${'★'.repeat(config.rating || 5)}
            </div>
          </div>
        </div>
      </div>
    </div>
  `;
}

// Initialize the slider
document.addEventListener('DOMContentLoaded', () => {
  window.testimonialSlider = new TestimonialSlider();
  
  // Example of adding a custom testimonial
  // const customTestimonial = createTestimonial({
  //   text: "Amazing service and support!",
  //   name: "Jane Doe",
  //   title: "Product Manager, TechStart",
  //   avatar: "https://images.unsplash.com/photo-1494790108755-2616b612b786?w=100&h=100&fit=crop&crop=face",
  //   rating: 5
  // });
  // 
  // window.testimonialSlider.addSlide(customTestimonial);
});