// ========================================
// Gallery 페이지 전용 JavaScript
// ========================================

document.addEventListener('DOMContentLoaded', function() {
    initGallery();
    initLightbox();
    initGalleryAnimations();
    initCustom360Viewers();
});

// 갤러리 초기화
function initGallery() {
    const galleryItems = document.querySelectorAll('.gallery-item');
    
    galleryItems.forEach((item, index) => {
        const img = item.querySelector('.gallery-img');
        
        // 이미지 클릭 시 라이트박스 열기
        img.addEventListener('click', () => openLightbox(index));
        
        // 이미지 로딩 에러 처리
        img.addEventListener('error', function() {
            this.src = 'images/placeholder.jpg';
            this.alt = '이미지를 불러올 수 없습니다';
        });
        
        // 레이지 로딩 구현
        if ('IntersectionObserver' in window) {
            const imageObserver = new IntersectionObserver((entries) => {
                entries.forEach(entry => {
                    if (entry.isIntersecting) {
                        const img = entry.target;
                        img.src = img.dataset.src || img.src;
                        img.classList.remove('lazy');
                        imageObserver.unobserve(img);
                    }
                });
            });
            
            if (img.dataset.src) {
                imageObserver.observe(img);
            }
        }
    });
}

// 라이트박스 기능
let currentImageIndex = 0;
const galleryImages = document.querySelectorAll('.gallery-img');

function initLightbox() {
    // 라이트박스 HTML 생성
    const lightboxHTML = `
        <div id="lightbox" class="lightbox">
            <div class="lightbox-content">
                <img id="lightbox-img" class="lightbox-img" src="" alt="">
                <div id="lightbox-caption" class="lightbox-caption"></div>
                <button class="lightbox-close" onclick="closeLightbox()"></button>
                <button class="lightbox-nav lightbox-prev" onclick="previousImage()">‹</button>
                <button class="lightbox-nav lightbox-next" onclick="nextImage()">›</button>
            </div>
        </div>
    `;
    
    document.body.insertAdjacentHTML('beforeend', lightboxHTML);
    
    // ESC 키로 라이트박스 닫기
    document.addEventListener('keydown', function(e) {
        if (e.key === 'Escape') closeLightbox();
        if (e.key === 'ArrowLeft') previousImage();
        if (e.key === 'ArrowRight') nextImage();
    });
    
    // 배경 클릭으로 라이트박스 닫기
    document.getElementById('lightbox').addEventListener('click', function(e) {
        if (e.target === this) closeLightbox();
    });
}

function openLightbox(index) {
    currentImageIndex = index;
    const lightbox = document.getElementById('lightbox');
    const lightboxImg = document.getElementById('lightbox-img');
    const lightboxCaption = document.getElementById('lightbox-caption');
    
    const currentImg = galleryImages[index];
    const caption = currentImg.closest('.gallery-item').querySelector('.gallery-caption');
    
    lightboxImg.src = currentImg.src;
    lightboxImg.alt = currentImg.alt;
    lightboxCaption.textContent = caption ? caption.textContent : currentImg.alt;
    
    lightbox.classList.add('active');
    document.body.style.overflow = 'hidden';
}

function closeLightbox() {
    const lightbox = document.getElementById('lightbox');
    lightbox.classList.remove('active');
    document.body.style.overflow = '';
}

function nextImage() {
    currentImageIndex = (currentImageIndex + 1) % galleryImages.length;
    openLightbox(currentImageIndex);
}

function previousImage() {
    currentImageIndex = (currentImageIndex - 1 + galleryImages.length) % galleryImages.length;
    openLightbox(currentImageIndex);
}

// 갤러리 애니메이션
function initGalleryAnimations() {
    const galleryItems = document.querySelectorAll('.gallery-item');
    
    // Intersection Observer를 사용한 애니메이션
    const observerOptions = {
        threshold: 0.1,
        rootMargin: '50px 0px'
    };
    
    const observer = new IntersectionObserver((entries) => {
        entries.forEach((entry, index) => {
            if (entry.isIntersecting) {
                setTimeout(() => {
                    entry.target.style.opacity = '1';
                    entry.target.style.transform = 'translateY(0)';
                }, index * 100);
                observer.unobserve(entry.target);
            }
        });
    }, observerOptions);
    
    galleryItems.forEach(item => {
        item.style.opacity = '0';
        item.style.transform = 'translateY(30px)';
        item.style.transition = 'all 0.6s cubic-bezier(0.4, 0, 0.2, 1)';
        observer.observe(item);
    });
}

// 갤러리 필터 기능 (향후 확장용)
function initGalleryFilters() {
    const filterButtons = document.querySelectorAll('.filter-btn');
    const galleryItems = document.querySelectorAll('.gallery-item');
    
    filterButtons.forEach(btn => {
        btn.addEventListener('click', function() {
            // 활성 버튼 업데이트
            filterButtons.forEach(b => b.classList.remove('active'));
            this.classList.add('active');
            
            const filter = this.dataset.filter;
            
            galleryItems.forEach(item => {
                if (filter === 'all' || item.dataset.category === filter) {
                    item.style.display = 'block';
                    setTimeout(() => {
                        item.style.opacity = '1';
                        item.style.transform = 'scale(1)';
                    }, 10);
                } else {
                    item.style.opacity = '0';
                    item.style.transform = 'scale(0.8)';
                    setTimeout(() => {
                        item.style.display = 'none';
                    }, 300);
                }
            });
        });
    });
}

// 이미지 프리로딩
function preloadImages() {
    galleryImages.forEach(img => {
        const imagePreload = new Image();
        imagePreload.src = img.src;
    });
}

// 갤러리 검색 기능 (향후 확장용)
function initGallerySearch() {
    const searchInput = document.getElementById('gallery-search');
    const galleryItems = document.querySelectorAll('.gallery-item');
    
    if (searchInput) {
        searchInput.addEventListener('input', function() {
            const searchTerm = this.value.toLowerCase();
            
            galleryItems.forEach(item => {
                const caption = item.querySelector('.gallery-caption');
                const alt = item.querySelector('.gallery-img').alt;
                const text = (caption ? caption.textContent : '') + ' ' + alt;
                
                if (text.toLowerCase().includes(searchTerm)) {
                    item.style.display = 'block';
                } else {
                    item.style.display = 'none';
                }
            });
        });
    }
}

// 이미지 로딩 상태 표시
function showGalleryLoading() {
    const loading = document.querySelector('.gallery-loading');
    if (loading) {
        loading.style.display = 'block';
    }
}

function hideGalleryLoading() {
    const loading = document.querySelector('.gallery-loading');
    if (loading) {
        loading.style.display = 'none';
    }
}

// 갤러리 그리드 리사이즈 최적화
let resizeTimeout;
window.addEventListener('resize', function() {
    clearTimeout(resizeTimeout);
    resizeTimeout = setTimeout(function() {
        // 갤러리 그리드 재조정 로직
        const galleryGrid = document.querySelector('.gallery-grid');
        if (galleryGrid) {
            galleryGrid.style.opacity = '0.8';
            setTimeout(() => {
                galleryGrid.style.opacity = '1';
            }, 100);
        }
    }, 250);
});

// 터치 이벤트 지원 (모바일)
let touchStartX = 0;
let touchEndX = 0;

document.addEventListener('touchstart', function(e) {
    if (document.getElementById('lightbox').classList.contains('active')) {
        touchStartX = e.changedTouches[0].screenX;
    }
});

document.addEventListener('touchend', function(e) {
    if (document.getElementById('lightbox').classList.contains('active')) {
        touchEndX = e.changedTouches[0].screenX;
        handleSwipe();
    }
});

function handleSwipe() {
    const swipeThreshold = 50;
    const diff = touchStartX - touchEndX;
    
    if (Math.abs(diff) > swipeThreshold) {
        if (diff > 0) {
            nextImage(); // 왼쪽으로 스와이프 = 다음 이미지
        } else {
            previousImage(); // 오른쪽으로 스와이프 = 이전 이미지
        }
    }
}

// ========================================
// 간단한 360도 파노라마 뷰어 - 좌우 스크롤 방식
// ========================================

class Easy360Viewer {
    constructor(container, imageSrc, title) {
        this.container = container;
        this.imageSrc = imageSrc;
        this.title = title;
        
        // 뷰어 상태
        this.currentX = 0; // 현재 X 위치
        this.maxX = 0; // 최대 스크롤 가능 X
        this.zoom = 1;
        
        // 마우스/터치 상태
        this.isDragging = false;
        this.startX = 0;
        this.lastX = 0;
        this.velocity = 0;
        
        // 자동 회전
        this.isAutoRotating = false;
        this.autoRotateSpeed = 1;
        this.animationId = null;
        
        // 터치 줌
        this.touchCount = 0;
        this.lastPinchDistance = 0;
        
        this.init();
    }
    
    init() {
        this.createViewer();
        this.bindEvents();
        this.startAnimation();
    }
    
    createViewer() {
        // 컨테이너 스타일
        this.container.style.cssText = `
            position: relative;
            width: 100%;
            height: 100%;
            overflow: hidden;
            background: #000;
            cursor: grab;
            user-select: none;
        `;
        
        // 360도 이미지 래퍼
        this.imageWrapper = document.createElement('div');
        this.imageWrapper.style.cssText = `
            position: absolute;
            top: 0;
            left: 0;
            height: 100%;
            will-change: transform;
            display: flex;
            align-items: center;
        `;
        
        // 로딩 표시
        this.showLoading();
        
        // 메인 360도 이미지
        this.image = document.createElement('img');
        this.image.src = this.imageSrc;
        this.image.style.cssText = `
            height: 100%;
            width: auto;
            object-fit: cover;
            user-select: none;
            pointer-events: none;
            display: block;
        `;
        this.image.draggable = false;
        
        // 이미지 로드 완료 후
        this.image.onload = () => {
            this.hideLoading();
            this.setupImageSize();
            this.createDuplicateImages();
            this.updateTransform();
        };
        
        this.image.onerror = () => {
            this.hideLoading();
            this.showError();
        };
        
        this.imageWrapper.appendChild(this.image);
        this.container.appendChild(this.imageWrapper);
    }
    
    setupImageSize() {
        // 이미지 자연 어숙비를 유지하면서 컨테이너 높이에 맞춤
        const containerHeight = this.container.clientHeight;
        const imageAspectRatio = this.image.naturalWidth / this.image.naturalHeight;
        const imageWidth = containerHeight * imageAspectRatio;
        
        // 360도 이미지는 보통 매우 가로가 김
        this.imageWrapper.style.width = imageWidth + 'px';
        
        // 스크롤 가능 범위 계산
        this.maxX = Math.max(0, imageWidth - this.container.clientWidth);
    }
    
    createDuplicateImages() {
        // 무한 스크롤을 위해 이미지 복사본 생성
        const imageClone1 = this.image.cloneNode();
        const imageClone2 = this.image.cloneNode();
        
        imageClone1.style.cssText = this.image.style.cssText;
        imageClone2.style.cssText = this.image.style.cssText;
        
        this.imageWrapper.appendChild(imageClone1);
        this.imageWrapper.appendChild(imageClone2);
        
        // 래퍼 전체 너비를 3배로
        const currentWidth = parseInt(this.imageWrapper.style.width);
        this.imageWrapper.style.width = (currentWidth * 3) + 'px';
        
        // 스크롤 범위 업데이트
        this.maxX = currentWidth * 2;
        
        // 시작 위치를 중앙 이미지로
        this.currentX = currentWidth;
        this.updateTransform();
    }
    
    showLoading() {
        const loader = document.createElement('div');
        loader.className = 'panorama-loader';
        loader.innerHTML = `
            <div class="spinner"></div>
            <p>360° 이미지 로딩중...</p>
        `;
        loader.style.cssText = `
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            text-align: center;
            color: #fff;
            z-index: 10;
            pointer-events: none;
        `;
        
        this.container.appendChild(loader);
        this.loadingElement = loader;
    }
    
    hideLoading() {
        if (this.loadingElement) {
            this.loadingElement.remove();
            this.loadingElement = null;
        }
    }
    
    showError() {
        const errorElement = document.createElement('div');
        errorElement.innerHTML = `
            <div style="text-align: center; color: #ff6b6b; padding: 20px;">
                <div style="font-size: 48px; margin-bottom: 10px;">😞</div>
                <div style="font-size: 18px; margin-bottom: 10px;">이미지를 불러올 수 없습니다</div>
                <div style="font-size: 14px; opacity: 0.8;">이미지 파일을 확인해주세요</div>
            </div>
        `;
        errorElement.style.cssText = `
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            z-index: 10;
        `;
        
        this.container.appendChild(errorElement);
    }
    
    bindEvents() {
        // 마우스 이벤트
        this.container.addEventListener('mousedown', this.handleStart.bind(this));
        this.container.addEventListener('mousemove', this.handleMove.bind(this));
        this.container.addEventListener('mouseup', this.handleEnd.bind(this));
        this.container.addEventListener('mouseleave', this.handleEnd.bind(this));
        
        // 터치 이벤트
        this.container.addEventListener('touchstart', this.handleStart.bind(this), { passive: false });
        this.container.addEventListener('touchmove', this.handleMove.bind(this), { passive: false });
        this.container.addEventListener('touchend', this.handleEnd.bind(this));
        
        // 휠 이벤트 (좌우 스크롤)
        this.container.addEventListener('wheel', this.handleWheel.bind(this), { passive: false });
        
        // 컨텍스트 메뉴 방지
        this.container.addEventListener('contextmenu', e => e.preventDefault());
        
        // 리사이즈
        window.addEventListener('resize', this.handleResize.bind(this));
    }
    
    handleStart(e) {
        e.preventDefault();
        this.isDragging = true;
        this.velocity = 0;
        this.container.style.cursor = 'grabbing';
        this.stopAutoRotate();
        
        if (e.touches) {
            this.touchCount = e.touches.length;
            
            if (this.touchCount === 1) {
                this.startX = e.touches[0].clientX;
            } else if (this.touchCount === 2) {
                // 핀치 줌 초기화
                const dx = e.touches[0].clientX - e.touches[1].clientX;
                const dy = e.touches[0].clientY - e.touches[1].clientY;
                this.lastPinchDistance = Math.sqrt(dx * dx + dy * dy);
                return; // 핀치일 때는 드래그 비활성화
            }
        } else {
            this.startX = e.clientX;
        }
        
        this.lastX = this.startX;
    }
    
    handleMove(e) {
        if (!this.isDragging) return;
        e.preventDefault();
        
        let currentX;
        
        if (e.touches) {
            if (this.touchCount === 1 && e.touches.length === 1) {
                currentX = e.touches[0].clientX;
                this.updatePosition(currentX);
                
            } else if (this.touchCount === 2 && e.touches.length === 2) {
                // 핀치 줌 처리
                const dx = e.touches[0].clientX - e.touches[1].clientX;
                const dy = e.touches[0].clientY - e.touches[1].clientY;
                const distance = Math.sqrt(dx * dx + dy * dy);
                
                if (this.lastPinchDistance > 0) {
                    const scale = distance / this.lastPinchDistance;
                    this.zoom = Math.max(0.8, Math.min(2.5, this.zoom * scale));
                    this.updateTransform();
                }
                
                this.lastPinchDistance = distance;
                return;
            }
        } else {
            currentX = e.clientX;
            this.updatePosition(currentX);
        }
    }
    
    updatePosition(currentX) {
        const deltaX = currentX - this.lastX;
        
        // 좌우 이동 (드래그 방향과 반대)
        this.currentX -= deltaX;
        
        // 속도 계산 (관성용)
        this.velocity = -deltaX * 0.1;
        
        this.updateTransform();
        this.lastX = currentX;
    }
    
    handleEnd() {
        this.isDragging = false;
        this.touchCount = 0;
        this.lastPinchDistance = 0;
        this.container.style.cursor = 'grab';
    }
    
    handleWheel(e) {
        e.preventDefault();
        
        // 휠로 좌우 스크롤
        const scrollSpeed = 50;
        this.currentX += e.deltaY > 0 ? scrollSpeed : -scrollSpeed;
        
        this.updateTransform();
    }
    
    handleResize() {
        if (this.image && this.image.complete) {
            this.setupImageSize();
            this.updateTransform();
        }
    }
    
    updateTransform() {
        if (!this.imageWrapper) return;
        
        // 무한 스크롤 처리
        const singleImageWidth = parseInt(this.imageWrapper.style.width) / 3;
        
        if (this.currentX < 0) {
            this.currentX += singleImageWidth;
        } else if (this.currentX > singleImageWidth * 2) {
            this.currentX -= singleImageWidth;
        }
        
        const transform = `translateX(${-this.currentX}px) scale(${this.zoom})`;
        this.imageWrapper.style.transform = transform;
    }
    
    startAnimation() {
        const animate = () => {
            // 관성 적용
            if (!this.isDragging && Math.abs(this.velocity) > 0.5) {
                this.currentX += this.velocity;
                this.velocity *= 0.95; // 마찰력
                this.updateTransform();
            }
            
            // 자동 회전
            if (this.isAutoRotating && !this.isDragging) {
                this.currentX += this.autoRotateSpeed;
                this.updateTransform();
            }
            
            this.animationId = requestAnimationFrame(animate);
        };
        
        animate();
    }
    
    reset() {
        this.currentX = parseInt(this.imageWrapper.style.width) / 3; // 중앙 이미지로
        this.zoom = 1;
        this.velocity = 0;
        this.stopAutoRotate();
        this.updateTransform();
    }
    
    startAutoRotate() {
        this.isAutoRotating = true;
    }
    
    stopAutoRotate() {
        this.isAutoRotating = false;
    }
    
    zoomIn() {
        this.zoom = Math.min(2.5, this.zoom * 1.2);
        this.updateTransform();
    }
    
    zoomOut() {
        this.zoom = Math.max(0.8, this.zoom * 0.8);
        this.updateTransform();
    }
    
    destroy() {
        this.stopAutoRotate();
        
        if (this.animationId) {
            cancelAnimationFrame(this.animationId);
        }
        
        window.removeEventListener('resize', this.handleResize.bind(this));
        
        if (this.container) {
            this.container.innerHTML = '';
        }
    }
}

let current360Viewer = null;

function initCustom360Viewers() {
    createPanoramaModal();
    initPanoramaPreviews();
}

function initPanoramaPreviews() {
    const clickableElements = document.querySelectorAll('.panorama-clickable');
    
    clickableElements.forEach(element => {
        const imageSrc = element.dataset.image;
        const title = element.dataset.title;
        
        element.addEventListener('click', () => {
            openPanoramaModal(imageSrc, title);
        });
        
        // 호버 효과
        element.addEventListener('mouseenter', () => {
            element.style.transform = 'scale(1.02)';
        });
        
        element.addEventListener('mouseleave', () => {
            element.style.transform = 'scale(1)';
        });
        
        // 도움말 자동 사라짐
        setTimeout(() => {
            const helpText = element.querySelector('.panorama-help');
            if (helpText) {
                helpText.style.opacity = '0';
                setTimeout(() => helpText.remove(), 500);
            }
        }, 4000);
    });
}

function createPanoramaModal() {
    const modalHTML = `
        <div id="panorama-modal" class="panorama-modal">
            <div class="panorama-modal-content">
                <div id="panorama-viewer-container" class="panorama-viewer-container">
                    <!-- 360도 뷰어가 여기에 들어갑니다 -->
                </div>
                
                <div class="panorama-modal-controls">
                    <div id="panorama-modal-title" class="panorama-modal-title"></div>
                    <div class="panorama-control-buttons">
                        <button class="panorama-btn" id="panorama-reset-btn">
                            <i class="fas fa-home"></i>
                            <span>초기화</span>
                        </button>
                        <button class="panorama-btn" id="panorama-auto-btn">
                            <i class="fas fa-sync-alt"></i>
                            <span>자동회전</span>
                        </button>
                        <button class="panorama-btn" id="panorama-zoom-in-btn">
                            <i class="fas fa-search-plus"></i>
                            <span>확대</span>
                        </button>
                        <button class="panorama-btn" id="panorama-zoom-out-btn">
                            <i class="fas fa-search-minus"></i>
                            <span>축소</span>
                        </button>
                        <button class="panorama-btn" id="panorama-help-btn">
                            <i class="fas fa-question-circle"></i>
                            <span>도움말</span>
                        </button>
                    </div>
                </div>
                
                <button class="panorama-modal-close" id="panorama-close-btn">
                    <i class="fas fa-times"></i>
                </button>
                
                <div class="panorama-help-panel" id="panorama-help-panel">
                    <h3>360° 조작 가이드</h3>
                    <div class="help-content">
                        <div class="help-item">
                            <i class="fas fa-mouse"></i>
                            <span>마우스 드래그로 화면을 회전시킬 수 있습니다</span>
                        </div>
                        <div class="help-item">
                            <i class="fas fa-hand-pointer"></i>
                            <span>터치 스크린에서는 손가락으로 드래그하세요</span>
                        </div>
                        <div class="help-item">
                            <i class="fas fa-search"></i>
                            <span>마우스 휠이나 핀치로 확대/축소할 수 있습니다</span>
                        </div>
                        <div class="help-item">
                            <i class="fas fa-sync-alt"></i>
                            <span>자동회전 버튼으로 자동으로 둘러볼 수 있습니다</span>
                        </div>
                        <div class="help-item">
                            <i class="fas fa-keyboard"></i>
                            <span>ESC 키를 눌러 닫을 수 있습니다</span>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    `;
    
    document.body.insertAdjacentHTML('beforeend', modalHTML);
    setupPanoramaModalEvents();
}

function setupPanoramaModalEvents() {
    const modal = document.getElementById('panorama-modal');
    const closeBtn = document.getElementById('panorama-close-btn');
    const resetBtn = document.getElementById('panorama-reset-btn');
    const autoBtn = document.getElementById('panorama-auto-btn');
    const zoomInBtn = document.getElementById('panorama-zoom-in-btn');
    const zoomOutBtn = document.getElementById('panorama-zoom-out-btn');
    const helpBtn = document.getElementById('panorama-help-btn');
    const helpPanel = document.getElementById('panorama-help-panel');
    
    let isAutoRotating = false;
    let isHelpVisible = false;
    
    // 모달 닫기
    closeBtn.addEventListener('click', closePanoramaModal);
    modal.addEventListener('click', (e) => {
        if (e.target === modal) closePanoramaModal();
    });
    
    // ESC 키로 닫기
    document.addEventListener('keydown', (e) => {
        if (e.key === 'Escape' && modal.classList.contains('active')) {
            closePanoramaModal();
        }
    });
    
    // 초기화 버튼
    resetBtn.addEventListener('click', () => {
        if (current360Viewer) {
            current360Viewer.reset();
        }
    });
    
    // 자동회전 버튼
    autoBtn.addEventListener('click', () => {
        if (current360Viewer) {
            if (isAutoRotating) {
                current360Viewer.stopAutoRotate();
                autoBtn.innerHTML = '<i class="fas fa-sync-alt"></i><span>자동회전</span>';
                autoBtn.classList.remove('active');
                isAutoRotating = false;
            } else {
                current360Viewer.startAutoRotate();
                autoBtn.innerHTML = '<i class="fas fa-pause"></i><span>정지</span>';
                autoBtn.classList.add('active');
                isAutoRotating = true;
            }
        }
    });
    
    // 확대 버튼
    zoomInBtn.addEventListener('click', () => {
        if (current360Viewer) {
            current360Viewer.zoomIn();
        }
    });
    
    // 축소 버튼
    zoomOutBtn.addEventListener('click', () => {
        if (current360Viewer) {
            current360Viewer.zoomOut();
        }
    });
    
    // 도움말 버튼
    helpBtn.addEventListener('click', () => {
        isHelpVisible = !isHelpVisible;
        helpPanel.style.display = isHelpVisible ? 'block' : 'none';
        helpBtn.classList.toggle('active', isHelpVisible);
    });
    
    // 도움말 패널 클릭시 닫기
    helpPanel.addEventListener('click', (e) => {
        if (e.target === helpPanel) {
            isHelpVisible = false;
            helpPanel.style.display = 'none';
            helpBtn.classList.remove('active');
        }
    });
}

function openPanoramaModal(imageSrc, title) {
    const modal = document.getElementById('panorama-modal');
    const modalTitle = document.getElementById('panorama-modal-title');
    const viewerContainer = document.getElementById('panorama-viewer-container');
    
    modalTitle.textContent = title;
    modal.classList.add('active');
    document.body.style.overflow = 'hidden';
    
    // 간단한 360도 좌우 스크롤 뷰어 생성
    current360Viewer = new Easy360Viewer(viewerContainer, imageSrc, title);
}

function closePanoramaModal() {
    const modal = document.getElementById('panorama-modal');
    const autoBtn = document.getElementById('panorama-auto-btn');
    const helpBtn = document.getElementById('panorama-help-btn');
    const helpPanel = document.getElementById('panorama-help-panel');
    
    // WebGL 뷰어 정리
    if (current360Viewer) {
        current360Viewer.destroy();
        current360Viewer = null;
    }
    
    // UI 초기화
    autoBtn.innerHTML = '<i class="fas fa-sync-alt"></i><span>자동회전</span>';
    autoBtn.classList.remove('active');
    helpBtn.classList.remove('active');
    helpPanel.style.display = 'none';
    
    modal.classList.remove('active');
    document.body.style.overflow = '';
    
    // 컨테이너 정리
    document.getElementById('panorama-viewer-container').innerHTML = '';
}