:root{--bg-primary: #fbfbfa;--bg-surface: #ffffff;--bg-surface-hover: #f3f3f2;--bg-secondary: #f0f0ee;--text-primary: #1c1c1e;--text-secondary: #636366;--text-muted: #8e8e93;--accent-color: #2c6ecb;--accent-color-hover: #1e54a3;--accent-light: #e8f0fe;--border-color: #e5e5ea;--border-focus: #b0b0b8;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .04);--shadow-md: 0 8px 24px rgba(0, 0, 0, .06);--shadow-lg: 0 16px 40px rgba(0, 0, 0, .12);--font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-serif: "Merriweather", Georgia, serif;--radius-sm: 6px;--radius-md: 12px;--radius-lg: 18px;--radius-full: 9999px;--header-height: 64px;--transition-fast: .2s cubic-bezier(.16, 1, .3, 1);--transition-normal: .3s cubic-bezier(.16, 1, .3, 1)}[data-theme=dark]{--bg-primary: #121214;--bg-surface: #1c1c1e;--bg-surface-hover: #26262a;--bg-secondary: #2c2c2e;--text-primary: #f2f2f7;--text-secondary: #a1a1a6;--text-muted: #6e6e73;--accent-color: #4c8bf5;--accent-color-hover: #6ea0f7;--accent-light: rgba(76, 139, 245, .15);--border-color: #2c2c2e;--border-focus: #48484a;--shadow-sm: 0 2px 8px rgba(0, 0, 0, .3);--shadow-md: 0 8px 24px rgba(0, 0, 0, .4);--shadow-lg: 0 16px 40px rgba(0, 0, 0, .5)}[data-theme=sepia]{--bg-primary: #f4ecd8;--bg-surface: #fbf0d9;--bg-surface-hover: #ede0c2;--bg-secondary: #e8d8b0;--text-primary: #433422;--text-secondary: #755d3f;--text-muted: #9a8264;--accent-color: #9e5927;--accent-color-hover: #7c431a;--accent-light: rgba(158, 89, 39, .15);--border-color: #e0d0a6;--border-focus: #c5b283;--shadow-sm: 0 2px 8px rgba(67, 52, 34, .08);--shadow-md: 0 8px 24px rgba(67, 52, 34, .12);--shadow-lg: 0 16px 40px rgba(67, 52, 34, .18)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{width:100%;height:100%;height:100dvh;overflow:hidden;font-family:var(--font-sans);background-color:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}#app{display:flex;flex-direction:column;height:100vh;height:100dvh;max-height:100dvh;width:100vw;position:relative;overflow:hidden}.app-header{height:var(--header-height);background-color:var(--bg-surface);border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;padding:0 1.5rem;z-index:50;transition:background-color var(--transition-normal),border-color var(--transition-normal)}.header-left,.header-right{display:flex;align-items:center;gap:.75rem;min-width:180px}.header-right{justify-content:flex-end}.header-center{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;overflow:hidden;padding:0 1rem}.brand{display:flex;align-items:center;gap:.5rem;font-weight:700;font-size:1.25rem;letter-spacing:-.02em;color:var(--text-primary);user-select:none}.brand-icon{width:24px;height:24px;color:var(--accent-color)}.header-book-title{font-size:.95rem;font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:400px}.header-chapter-title{font-size:.75rem;color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:350px}.icon-btn{background:transparent;border:none;color:var(--text-secondary);width:44px;height:44px;border-radius:var(--radius-full);display:inline-flex;align-items:center;justify-content:center;gap:.5rem;cursor:pointer;transition:all var(--transition-fast);padding:0 .75rem;font-size:.875rem;font-weight:500}#back-to-shelf-btn{width:auto;padding:0 1rem;background-color:var(--bg-secondary);color:var(--text-primary)}.icon-btn:hover{background-color:var(--bg-surface-hover);color:var(--text-primary)}.main-content{flex:1;position:relative;overflow:hidden}.view{position:absolute;top:0;left:0;width:100%;height:100%;display:flex;flex-direction:column;opacity:0;pointer-events:none;transition:opacity var(--transition-normal);overflow-y:auto}.view.active{opacity:1;pointer-events:auto}.bookshelf-hero{background:linear-gradient(180deg,var(--bg-surface) 0%,var(--bg-primary) 100%);padding:2.5rem 1.5rem 1.5rem;border-bottom:1px solid var(--border-color);display:flex;justify-content:center}.hero-content{max-width:900px;width:100%;display:flex;flex-direction:column;gap:.75rem}.hero-subtitle{font-size:.85rem;text-transform:uppercase;letter-spacing:.08em;font-weight:600;color:var(--accent-color)}.hero-title{font-size:2rem;font-weight:700;letter-spacing:-.03em;color:var(--text-primary)}.search-box{position:relative;margin-top:.5rem;width:100%}.search-box input{width:100%;height:48px;padding:0 2.75rem;border-radius:var(--radius-md);border:1px solid var(--border-color);background-color:var(--bg-surface);color:var(--text-primary);font-size:.95rem;font-family:var(--font-sans);outline:none;box-shadow:var(--shadow-sm);transition:all var(--transition-fast)}.search-box input:focus{border-color:var(--accent-color);box-shadow:0 0 0 3px var(--accent-light)}.search-icon{position:absolute;left:1rem;top:50%;transform:translateY(-50%);width:20px;height:20px;color:var(--text-muted)}.search-clear{position:absolute;right:.75rem;top:50%;transform:translateY(-50%);background:transparent;border:none;color:var(--text-muted);cursor:pointer;padding:.25rem;border-radius:var(--radius-full)}.categories-bar{display:flex;gap:.5rem;margin-top:.5rem;overflow-x:auto;padding-bottom:.25rem}.category-pill{background-color:var(--bg-surface);border:1px solid var(--border-color);color:var(--text-secondary);padding:.4rem 1rem;border-radius:var(--radius-full);font-size:.85rem;font-weight:500;cursor:pointer;white-space:nowrap;transition:all var(--transition-fast)}.category-pill:hover{border-color:var(--border-focus);color:var(--text-primary)}.category-pill.active{background-color:var(--text-primary);color:var(--bg-surface);border-color:var(--text-primary)}.bookshelf-container{max-width:1050px;width:100%;margin:0 auto;padding:2rem 1.5rem 4rem}.books-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:2rem}.book-card{background-color:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-md);overflow:hidden;display:flex;flex-direction:column;cursor:pointer;transition:transform var(--transition-fast),box-shadow var(--transition-fast),border-color var(--transition-fast);box-shadow:var(--shadow-sm)}.book-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-md);border-color:var(--border-focus)}.book-cover-wrapper{position:relative;width:100%;aspect-ratio:2 / 3;background-color:var(--bg-secondary);overflow:hidden}.book-cover-img{width:100%;height:100%;object-fit:cover;transition:transform var(--transition-normal)}.book-card:hover .book-cover-img{transform:scale(1.03)}.book-badge{position:absolute;top:.75rem;right:.75rem;background-color:#000000bf;backdrop-filter:blur(8px);color:#fff;font-size:.75rem;font-weight:600;padding:.25rem .6rem;border-radius:var(--radius-full)}.book-info{padding:1rem;display:flex;flex-direction:column;gap:.35rem;flex:1}.book-category{font-size:.75rem;color:var(--accent-color);font-weight:600;text-transform:uppercase;letter-spacing:.05em}.book-title{font-size:1rem;font-weight:600;color:var(--text-primary);line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.book-author{font-size:.85rem;color:var(--text-secondary)}.book-progress-bar{margin-top:auto;padding-top:.75rem}.mini-progress-bg{height:4px;background-color:var(--bg-secondary);border-radius:var(--radius-full);overflow:hidden}.mini-progress-fill{height:100%;background-color:var(--accent-color);border-radius:var(--radius-full)}.book-card-skeleton{aspect-ratio:2/3.5;background-color:var(--bg-surface);border-radius:var(--radius-md);border:1px solid var(--border-color);animation:pulse 1.5s infinite ease-in-out}@keyframes pulse{0%{opacity:.6}50%{opacity:.9}to{opacity:.6}}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:4rem 1rem;text-align:center;color:var(--text-muted);gap:.75rem}.empty-icon{width:48px;height:48px}#reader-view{overflow:hidden;background-color:var(--bg-primary);display:flex;flex-direction:column;flex:1;height:100%;min-height:0}.reader-wrapper{flex:1;min-height:0;display:flex;align-items:stretch;justify-content:space-between;position:relative;overflow:hidden;padding:0 1rem}.reader-stage{flex:1;min-height:0;height:100%;width:100%;max-width:900px;margin:0 auto;position:relative;display:flex;align-items:stretch;justify-content:center;overflow:hidden}.viewer{width:100%;height:100%;min-height:0;background:transparent}.tap-zone{display:none;position:absolute;top:0;bottom:0;width:30%;z-index:20;-webkit-tap-highlight-color:transparent;cursor:pointer;user-select:none}.tap-zone-left{left:0}.tap-zone-right{right:0}@media (pointer: coarse){.tap-zone{display:block}}.reader-loading{position:absolute;display:flex;flex-direction:column;align-items:center;gap:1rem;color:var(--text-secondary);font-size:.9rem}.spinner{width:32px;height:32px;border:3px solid var(--border-color);border-top-color:var(--accent-color);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.nav-arrow-btn{background:var(--bg-surface);border:1px solid var(--border-color);color:var(--text-secondary);width:44px;height:44px;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;align-self:center;cursor:pointer;box-shadow:var(--shadow-sm);z-index:10;transition:all var(--transition-fast)}.nav-arrow-btn:hover{background:var(--bg-surface-hover);color:var(--text-primary);transform:scale(1.08)}.reader-footer{height:48px;flex-shrink:0;background-color:var(--bg-surface);border-top:1px solid var(--border-color);display:flex;align-items:center;justify-content:center;padding:0 1.5rem;padding-bottom:max(0px,env(safe-area-inset-bottom));z-index:40}.progress-container{display:flex;align-items:center;gap:1rem;max-width:500px;width:100%}.progress-bar-bg{flex:1;height:6px;background-color:var(--bg-secondary);border-radius:var(--radius-full);overflow:hidden}.progress-bar-fill{height:100%;background-color:var(--accent-color);transition:width .3s ease}.progress-text{font-size:.8rem;font-weight:500;color:var(--text-secondary);min-width:80px;text-align:right}.modal-overlay{position:fixed;top:0;left:0;width:100vw;height:100vh;background-color:#0006;backdrop-filter:blur(4px);z-index:100;display:flex;justify-content:flex-end;opacity:1;transition:opacity var(--transition-fast)}.modal-overlay.hidden{opacity:0;pointer-events:none}.toc-drawer{width:380px;max-width:90vw;height:100%;background-color:var(--bg-surface);box-shadow:var(--shadow-lg);display:flex;flex-direction:column;transform:translate(0);transition:transform var(--transition-normal)}.modal-overlay.hidden .toc-drawer{transform:translate(100%)}.modal-header{height:var(--header-height);border-bottom:1px solid var(--border-color);padding:0 1.25rem;display:flex;align-items:center;justify-content:space-between}.modal-title{display:flex;align-items:center;gap:.5rem;font-weight:600;font-size:1rem}.modal-body{flex:1;overflow-y:auto;padding:1.25rem}.toc-list{display:flex;flex-direction:column;gap:.25rem}.toc-item{padding:.75rem 1rem;border-radius:var(--radius-sm);color:var(--text-primary);font-size:.9rem;cursor:pointer;transition:background-color var(--transition-fast);border:none;background:transparent;text-align:left;line-height:1.4}.toc-item:hover{background-color:var(--bg-surface-hover)}.toc-item.active{background-color:var(--accent-light);color:var(--accent-color);font-weight:600}.settings-popover{position:absolute;top:calc(var(--header-height) + 8px);right:1.5rem;width:340px;background-color:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);display:flex;flex-direction:column}.settings-body{display:flex;flex-direction:column;gap:1.5rem}.setting-group{display:flex;flex-direction:column;gap:.6rem}.setting-header{display:flex;justify-content:space-between;align-items:center}.setting-label{font-size:.85rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.04em}.setting-value{font-size:.85rem;font-weight:600;color:var(--text-primary)}.theme-options{display:grid;grid-template-columns:repeat(3,1fr);gap:.5rem}.theme-option-btn{display:flex;flex-direction:column;align-items:center;gap:.4rem;padding:.5rem;border-radius:var(--radius-sm);border:2px solid var(--border-color);background:var(--bg-surface);color:var(--text-primary);font-size:.8rem;font-weight:500;cursor:pointer;transition:all var(--transition-fast)}.theme-option-btn.active{border-color:var(--accent-color)}.theme-preview{width:100%;height:24px;border-radius:4px;border:1px solid rgba(0,0,0,.1)}.theme-preview.light{background-color:#fff}.theme-preview.sepia{background-color:#f4ecd8}.theme-preview.dark{background-color:#1a1a1a}.font-size-controls{display:flex;align-items:center;gap:.75rem}.font-size-controls input[type=range]{flex:1;accent-color:var(--accent-color)}.btn-secondary{background-color:var(--bg-secondary);border:1px solid var(--border-color);color:var(--text-primary);font-weight:600;font-size:.9rem;padding:.4rem .75rem;border-radius:var(--radius-sm);cursor:pointer}.btn-secondary:hover{background-color:var(--bg-surface-hover)}.font-family-options{display:flex;flex-direction:column;gap:.4rem}.font-btn{padding:.6rem .8rem;border:1px solid var(--border-color);border-radius:var(--radius-sm);background-color:var(--bg-surface);color:var(--text-primary);text-align:left;font-size:.9rem;cursor:pointer;transition:all var(--transition-fast)}.font-btn.active{border-color:var(--accent-color);background-color:var(--accent-light);color:var(--accent-color);font-weight:600}.hidden{display:none!important}:focus-visible{outline:3px solid var(--accent-color);outline-offset:2px;border-radius:4px}.icon-btn:focus-visible,.nav-arrow-btn:focus-visible,.search-box input:focus-visible,.category-pill:focus-visible,.book-card:focus-visible{outline:3px solid var(--accent-color);outline-offset:2px}@media (max-width: 900px){.books-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:1.5rem}.nav-arrow-btn{display:none!important}}@media (max-width: 768px){:root{--header-height: 56px}.app-header{padding:0 .75rem}.brand-name{display:none}.header-left,.header-right{min-width:auto;gap:.25rem}#back-to-shelf-btn span{display:none}.header-book-title{font-size:.85rem;max-width:150px}.header-chapter-title{display:none}.bookshelf-hero{padding:1.5rem 1rem 1rem}.hero-title{font-size:1.5rem}.bookshelf-container{padding:1.5rem 1rem 4rem}.books-grid{grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:1rem}.reader-wrapper{padding:0 .25rem}.nav-arrow-btn{display:none!important}.settings-popover{position:fixed;inset:auto 0 0;width:100%;border-radius:var(--radius-lg) var(--radius-lg) 0 0;box-shadow:0 -4px 20px #00000026;max-height:80vh;overflow-y:auto}.toc-drawer{width:100vw;max-width:100vw}}@media (max-height: 500px){:root{--header-height: 44px}.reader-footer{height:36px;padding:0 1rem}.progress-text{font-size:.75rem;min-width:70px}.app-header{padding:0 .75rem}}@media (max-width: 480px){.books-grid{grid-template-columns:1fr 1fr}}