:root{--bg-light: #ffffff;--bg-light-secondary: #f4f5f7;--text-light: #172b4d;--text-light-secondary: #6b778c;--border-light: #dfe1e6;--bg-dark: #1a1a1a;--bg-dark-secondary: #2d2d2d;--text-dark: #ffffff;--text-dark-secondary: #a5adba;--border-dark: #3d3d3d;--accent-primary: #0052cc;--accent-primary-hover: #0065ff;--accent-success: #36b37e;--accent-warning: #ffab00;--accent-danger: #de350b;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .1);--shadow-md: 0 4px 8px rgba(0, 0, 0, .15);--shadow-lg: 0 8px 16px rgba(0, 0, 0, .2);--transition-fast: .15s ease;--transition-normal: .25s ease;--transition-slow: .4s ease;--z-viewer: 1;--z-controls: 10;--z-overlay: 100;--z-modal: 200;--z-tooltip: 300}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;overflow:hidden}.theme-light{--bg-primary: var(--bg-light);--bg-secondary: var(--bg-light-secondary);--text-primary: var(--text-light);--text-secondary: var(--text-light-secondary);--border-color: var(--border-light)}.theme-dark{--bg-primary: var(--bg-dark);--bg-secondary: var(--bg-dark-secondary);--text-primary: var(--text-dark);--text-secondary: var(--text-dark-secondary);--border-color: var(--border-dark)}.app-container{width:100%;height:100vh;display:flex;flex-direction:column;background-color:var(--bg-primary);color:var(--text-primary);transition:background-color var(--transition-normal),color var(--transition-normal)}.header{display:flex;align-items:center;justify-content:space-between;padding:8px 16px;background-color:var(--bg-secondary);border-bottom:1px solid var(--border-color);min-height:56px;z-index:var(--z-controls)}.header-title{font-size:18px;font-weight:600;display:flex;align-items:center;gap:8px}.header-actions{display:flex;align-items:center;gap:8px}.viewer-container{flex:1;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden;z-index:var(--z-viewer)}.spread-view{display:flex;align-items:center;justify-content:center;width:100%;height:100%}.spread-view.rtl{flex-direction:row-reverse}.spread-view.ltr{flex-direction:row}.image-container{display:flex;align-items:center;justify-content:center;height:100%;flex:1;max-width:50%}.image-container.single{max-width:100%}.viewer-image{max-width:100%;max-height:100%;object-fit:contain;-webkit-user-select:none;user-select:none;-webkit-user-drag:none}.scale-original .viewer-image{max-width:none;max-height:none;width:auto;height:auto}.scale-fitWidth .viewer-image{width:100%;max-width:100%;height:auto;max-height:none}.scale-fitHeight .viewer-image{height:100%;max-height:100%;width:auto;max-width:none}.scale-fitBoth .viewer-image{max-width:100%;max-height:100%}.click-area{position:absolute;top:0;bottom:0;width:25%;cursor:pointer;z-index:var(--z-controls);opacity:0;transition:opacity var(--transition-fast)}.click-area:hover{opacity:1;background:linear-gradient(to right,rgba(255,255,255,.1),transparent)}.click-area.left{left:0}.click-area.right{right:0;background:linear-gradient(to left,rgba(255,255,255,.1),transparent)}.click-area-icon{position:absolute;top:50%;transform:translateY(-50%);font-size:48px;color:#fffc;text-shadow:0 2px 4px rgba(0,0,0,.5)}.click-area.left .click-area-icon{left:20px}.click-area.right .click-area-icon{right:20px}.controls-bar{display:flex;align-items:center;justify-content:center;gap:16px;padding:12px 16px;background-color:var(--bg-secondary);border-top:1px solid var(--border-color);z-index:var(--z-controls)}.controls-overlay{position:absolute;bottom:0;left:0;right:0;padding:16px;background:linear-gradient(to top,rgba(0,0,0,.8),transparent);opacity:0;transition:opacity var(--transition-normal);z-index:var(--z-overlay)}.controls-overlay:hover,.controls-overlay.visible{opacity:1}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 16px;border:none;border-radius:4px;font-size:14px;font-weight:500;cursor:pointer;transition:background-color var(--transition-fast),transform var(--transition-fast);-webkit-user-select:none;user-select:none}.btn:hover{transform:translateY(-1px)}.btn:active{transform:translateY(0)}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-primary{background-color:var(--accent-primary);color:#fff}.btn-primary:hover:not(:disabled){background-color:var(--accent-primary-hover)}.btn-secondary{background-color:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover:not(:disabled){background-color:var(--border-color)}.btn-icon{padding:8px;width:40px;height:40px;border-radius:50%;background-color:transparent;color:var(--text-primary)}.btn-icon:hover:not(:disabled){background-color:var(--bg-secondary)}.page-info{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text-secondary)}.page-input{width:60px;padding:4px 8px;border:1px solid var(--border-color);border-radius:4px;background-color:var(--bg-primary);color:var(--text-primary);text-align:center;font-size:14px}.slideshow-indicator{display:flex;align-items:center;gap:8px;padding:8px 16px;background-color:var(--accent-primary);color:#fff;border-radius:20px;font-size:14px}.slideshow-progress{width:100px;height:4px;background-color:#ffffff4d;border-radius:2px;overflow:hidden}.slideshow-progress-bar{height:100%;background-color:#fff;transition:width .1s linear}.thumbnail-container{position:absolute;bottom:60px;left:0;right:0;background-color:var(--bg-secondary);border-top:1px solid var(--border-color);padding:8px;overflow-x:auto;z-index:var(--z-controls);opacity:0;transform:translateY(100%);transition:opacity var(--transition-normal),transform var(--transition-normal)}.thumbnail-container.visible{opacity:1;transform:translateY(0)}.thumbnail-list{display:flex;gap:8px;min-height:80px}.thumbnail-item{flex-shrink:0;width:60px;height:80px;border:2px solid transparent;border-radius:4px;overflow:hidden;cursor:pointer;transition:border-color var(--transition-fast),transform var(--transition-fast)}.thumbnail-item:hover{transform:scale(1.05)}.thumbnail-item.active{border-color:var(--accent-primary)}.thumbnail-image{width:100%;height:100%;object-fit:cover}.settings-panel{position:absolute;top:56px;right:0;width:320px;max-height:calc(100vh - 120px);background-color:var(--bg-secondary);border-left:1px solid var(--border-color);border-bottom:1px solid var(--border-color);border-radius:0 0 0 8px;box-shadow:var(--shadow-lg);overflow-y:auto;z-index:var(--z-overlay);transform:translate(100%);transition:transform var(--transition-normal)}.settings-panel.open{transform:translate(0)}.settings-header{display:flex;align-items:center;justify-content:space-between;padding:16px;border-bottom:1px solid var(--border-color)}.settings-title{font-size:16px;font-weight:600}.settings-section{padding:16px;border-bottom:1px solid var(--border-color)}.settings-section:last-child{border-bottom:none}.settings-section-title{font-size:12px;font-weight:600;text-transform:uppercase;color:var(--text-secondary);margin-bottom:12px}.settings-item{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.settings-item:last-child{margin-bottom:0}.settings-label{font-size:14px}.settings-select,.settings-input{padding:6px 12px;border:1px solid var(--border-color);border-radius:4px;background-color:var(--bg-primary);color:var(--text-primary);font-size:14px}.settings-select{min-width:120px}.settings-checkbox{width:18px;height:18px;cursor:pointer}.loading-overlay{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background-color:#000000b3;z-index:var(--z-modal)}.loading-spinner{width:48px;height:48px;border:4px solid var(--border-color);border-top-color:var(--accent-primary);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-text{margin-top:16px;font-size:16px;color:#fff}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;padding:32px;text-align:center}.empty-state-icon{font-size:64px;margin-bottom:24px;opacity:.5}.empty-state-title{font-size:24px;font-weight:600;margin-bottom:12px}.empty-state-description{font-size:16px;color:var(--text-secondary);margin-bottom:24px;max-width:400px}.error-message{display:flex;align-items:center;gap:12px;padding:12px 16px;background-color:#de350b1a;border:1px solid var(--accent-danger);border-radius:4px;color:var(--accent-danger);margin:16px}.warning-message{display:flex;align-items:flex-start;gap:12px;padding:12px 16px;background-color:#ffab001a;border:1px solid var(--accent-warning);border-radius:4px;color:var(--accent-warning);margin:16px}.warning-message-content{flex:1}.warning-message-title{font-weight:600;margin-bottom:4px}.warning-message-list{font-size:12px;max-height:100px;overflow-y:auto}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;display:flex;align-items:center;justify-content:center;background-color:#0009;z-index:var(--z-modal)}.modal-content{background-color:var(--bg-secondary);border-radius:8px;box-shadow:var(--shadow-lg);max-width:480px;width:90%;max-height:80vh;overflow-y:auto}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border-color)}.modal-title{font-size:18px;font-weight:600}.modal-body{padding:20px}.modal-footer{display:flex;justify-content:flex-end;gap:12px;padding:16px 20px;border-top:1px solid var(--border-color)}.fullscreen .header,.fullscreen .controls-bar{display:none}.fullscreen .viewer-container{height:100vh}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.btn:focus-visible,.settings-select:focus-visible,.settings-input:focus-visible,.thumbnail-item:focus-visible{outline:2px solid var(--accent-primary);outline-offset:2px}@media (max-width: 768px){.header{padding:8px 12px}.header-title{font-size:16px}.settings-panel{width:100%;max-height:60vh;top:auto;bottom:0;border-radius:16px 16px 0 0;transform:translateY(100%)}.settings-panel.open{transform:translateY(0)}.thumbnail-item{width:50px;height:66px}.click-area{width:33%}}@media (max-width: 2048px) and (min-resolution: 1.5dppx){.btn{min-width:48px;min-height:48px;padding:12px 20px}.btn-icon{width:56px;height:56px;font-size:24px}.thumbnail-item{width:80px;height:106px}.click-area{width:30%}.click-area-icon{font-size:64px}}