@import "https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap";*{box-sizing:border-box;margin:0;padding:0;font-family:Roboto,sans-serif;transition:background-color .3s,color .3s,border-color .3s}:root{--bg-primary:#f8fafc;--bg-card:#fff;--bg-hover:#f1f5f9;--text-primary:#1e293b;--text-secondary:#64748b;--text-muted:#94a3b8;--border-color:#e2e8f0;--accent-color:#3b82f6;--accent-light:#3b82f61a;--accent-hover:#2563eb;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -1px #0000000f;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -2px #0000000d;--sidebar-width:280px}.theme-light{--bg-primary:#f8fafc;--bg-card:#fff;--bg-hover:#f1f5f9;--text-primary:#1e293b;--text-secondary:#64748b;--text-muted:#94a3b8;--border-color:#e2e8f0;--accent-color:#3b82f6;--accent-light:#3b82f61a;--accent-hover:#2563eb;--vocab-highlight:#2563eb;--vocab-highlight-bg:#2563eb14;--grammar-highlight:#d97706;--grammar-highlight-bg:#d9770614}.theme-dark{--bg-primary:#0f172a;--bg-card:#1e293b;--bg-hover:#334155;--text-primary:#f1f5f9;--text-secondary:#94a3b8;--text-muted:#64748b;--border-color:#334155;--accent-color:#60a5fa;--accent-light:#60a5fa26;--accent-hover:#3b82f6;--vocab-highlight:#60a5fa;--vocab-highlight-bg:#60a5fa2e;--grammar-highlight:#fbbf24;--grammar-highlight-bg:#fbbf242e}.theme-sepia{--bg-primary:#fdf6e3;--bg-card:#eee8d5;--bg-hover:#e4dbbf;--text-primary:#586e75;--text-secondary:#657b83;--text-muted:#93a1a1;--border-color:#d3c7a9;--accent-color:#b58900;--accent-light:#b5890026;--accent-hover:#cb4b16;--vocab-highlight:#b58900;--vocab-highlight-bg:#b589001f;--grammar-highlight:#cb4b16;--grammar-highlight-bg:#cb4b161f}.theme-forest{--bg-primary:#162421;--bg-card:#203530;--bg-hover:#29463f;--text-primary:#e6edea;--text-secondary:#a1b8b1;--text-muted:#748f87;--border-color:#2e4d45;--accent-color:#10b981;--accent-light:#10b98126;--accent-hover:#059669;--vocab-highlight:#34d399;--vocab-highlight-bg:#34d3992e;--grammar-highlight:#fbbf24;--grammar-highlight-bg:#fbbf242e}body{background-color:var(--bg-primary);color:var(--text-primary);height:100vh;font-size:16px;line-height:1.6;overflow:hidden}.app-container{background-color:var(--bg-primary);width:100vw;height:100vh;color:var(--text-primary);display:flex;overflow:hidden}.sidebar{width:var(--sidebar-width);background-color:var(--bg-card);border-right:1px solid var(--border-color);z-index:20;flex-direction:column;flex-shrink:0;height:100%;display:flex}.sidebar-header{border-bottom:1px solid var(--border-color);align-items:center;gap:.75rem;padding:1.5rem 1.25rem;display:flex}.logo-icon{background:var(--accent-color);color:#fff;border-radius:8px;justify-content:center;align-items:center;width:36px;height:36px;font-size:1.25rem;font-weight:700;display:flex}.app-title h1{letter-spacing:-.025em;color:var(--text-primary);font-size:1.15rem;font-weight:700}.app-title span{color:var(--text-secondary);font-size:.75rem}.sidebar-scrollable{flex:1;padding:1rem 1.25rem;overflow-y:auto}.control-section{margin-bottom:1.5rem}.control-label{text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:.5rem;font-size:.75rem;font-weight:700;display:block}.chapter-select{border:1px solid var(--border-color);background-color:var(--bg-primary);width:100%;color:var(--text-primary);cursor:pointer;border-radius:8px;outline:none;padding:.625rem;font-size:.9rem}.chapter-select:focus{border-color:var(--accent-color)}.mode-toggle-group{background-color:var(--bg-primary);border:1px solid var(--border-color);border-radius:8px;padding:.25rem;display:flex}.mode-btn{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:6px;flex:1;justify-content:center;align-items:center;gap:.35rem;padding:.5rem;font-size:.85rem;font-weight:500;display:flex}.mode-btn.active{background-color:var(--bg-card);color:var(--accent-color);box-shadow:var(--shadow-sm)}.theme-grid{grid-template-columns:repeat(2,1fr);gap:.5rem;display:grid}.theme-btn{border:1px solid var(--border-color);cursor:pointer;text-transform:capitalize;border-radius:8px;justify-content:center;align-items:center;gap:.4rem;padding:.5rem;font-size:.8rem;font-weight:500;display:flex}.theme-btn-light{color:#1e293b;background:#f8fafc}.theme-btn-dark{color:#f1f5f9;background:#0f172a}.theme-btn-sepia{color:#586e75;background:#fdf6e3;border-color:#eee8d5}.theme-btn-forest{color:#e6edea;background:#162421;border-color:#203530}.theme-btn.active{border-width:2px;border-color:var(--accent-color);box-shadow:0 0 0 2px var(--accent-light)}.range-control{align-items:center;gap:.75rem;display:flex}.range-control input{cursor:pointer;accent-color:var(--accent-color);flex:1}.range-val{color:var(--text-secondary);text-align:right;min-width:2rem;font-size:.8rem}.sidebar-footer{border-top:1px solid var(--border-color);flex-direction:column;gap:.75rem;padding:1.25rem;display:flex}.footer-btn{border:1px solid var(--border-color);background-color:var(--bg-primary);width:100%;color:var(--text-primary);cursor:pointer;border-radius:8px;justify-content:center;align-items:center;gap:.5rem;padding:.625rem;font-size:.85rem;font-weight:500;display:flex}.footer-btn:hover{background-color:var(--bg-hover);color:var(--accent-color);border-color:var(--accent-color)}.main-content{flex-direction:column;flex:1;display:flex;position:relative;overflow:hidden}.top-bar{background-color:var(--bg-card);border-bottom:1px solid var(--border-color);z-index:10;flex-shrink:0;justify-content:space-between;align-items:center;height:64px;padding:0 1.5rem;display:flex}.chapter-title h2{color:var(--text-primary);font-size:1.1rem;font-weight:600}.reading-progress-container{color:var(--text-secondary);align-items:center;gap:1rem;font-size:.8rem;display:flex}.progress-track{background-color:var(--border-color);border-radius:3px;width:120px;height:6px;overflow:hidden}.progress-bar{background-color:var(--accent-color);border-radius:3px;height:100%}.reader-workspace{flex:1;display:flex;overflow:hidden}.reader-panel{background-color:var(--bg-primary);flex-direction:column;flex:1;height:100%;display:flex;overflow:hidden}.parallel-layout{flex-direction:column;height:100%;padding:2.5rem 2rem;display:flex;overflow-y:auto}.parallel-layout::-webkit-scrollbar{width:8px}.parallel-layout::-webkit-scrollbar-track{background:0 0}.parallel-layout::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}.parallel-layout::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.paragraph-row{cursor:pointer;border:1px solid #0000;border-radius:8px;grid-template-columns:1fr 1fr;gap:3rem;margin-bottom:.75rem;padding:1rem 1.25rem;transition:all .2s;display:grid;position:relative}.paragraph-row:after{content:"";background-color:var(--border-color);opacity:.3;pointer-events:none;width:1px;position:absolute;top:1rem;bottom:1rem;left:50%;transform:translate(-50%)}.paragraph-row.highlighted{background-color:var(--accent-light);border-color:var(--accent-color)}.paragraph-cell{position:relative}.highlighted-term{cursor:help;border-radius:4px;padding:.1rem .25rem;font-weight:500;transition:all .2s;display:inline}.highlight-word-vocab{color:var(--vocab-highlight);background-color:var(--vocab-highlight-bg);border-bottom:2px solid var(--vocab-highlight)}.highlight-word-grammar{color:var(--grammar-highlight);background-color:var(--grammar-highlight-bg);border-bottom:2px dashed var(--grammar-highlight)}.highlighted-term:hover{filter:brightness(.95);box-shadow:0 1px 2px #00000014}.tabbed-layout{flex-direction:column;height:100%;display:flex}.tab-nav{background-color:var(--bg-card);border-bottom:1px solid var(--border-color);padding:0 1rem;display:flex}.tab-link{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-bottom:3px solid #0000;padding:.85rem 1.25rem;font-size:.9rem;font-weight:500}.tab-link.active{color:var(--accent-color);border-bottom-color:var(--accent-color)}.tab-pane{flex:1;padding:2rem;overflow-y:auto}.dict-popup{z-index:100;background-color:var(--bg-card);border:1px solid var(--border-color);width:290px;box-shadow:var(--shadow-lg);pointer-events:auto;border-radius:12px;flex-direction:column;gap:.65rem;padding:1.15rem;animation:.18s cubic-bezier(.16,1,.3,1) popupFadeIn;display:flex;position:absolute}@keyframes popupFadeIn{0%{opacity:0;transform:scale(.95)translateY(5px)}to{opacity:1;transform:scale(1)translateY(0)}}.dict-header{justify-content:space-between;align-items:flex-start;display:flex}.dict-word-info{flex-direction:column;display:flex}.dict-word{color:var(--text-primary);font-size:1.1rem;font-weight:700}.dict-meta{align-items:center;gap:.5rem;margin-top:.15rem;font-size:.75rem;display:flex}.dict-type{color:var(--accent-color);font-style:italic;font-weight:500}.dict-ipa{color:var(--text-secondary)}.close-btn{color:var(--text-muted);cursor:pointer;background:0 0;border:none;font-size:1rem}.close-btn:hover{color:var(--text-primary)}.dict-definition{color:var(--text-primary);border-left:3px solid var(--accent-color);margin:.25rem 0;padding-left:.5rem;font-size:.9rem;font-weight:500}.dict-example{color:var(--text-secondary);background-color:var(--bg-primary);border-radius:6px;padding:.5rem;font-size:.8rem;font-style:italic}.dict-save-btn{background-color:var(--accent-color);color:#fff;cursor:pointer;border:none;border-radius:6px;justify-content:center;align-items:center;gap:.4rem;width:100%;padding:.5rem;font-size:.8rem;font-weight:500;display:flex}.dict-save-btn:hover{background-color:var(--accent-hover)}.study-panel{background-color:var(--bg-card);border-left:1px solid var(--border-color);z-index:15;flex-direction:column;flex-shrink:0;width:380px;height:100%;display:flex}.study-header{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding:1rem 1.25rem;display:flex}.study-title{color:var(--text-primary);align-items:center;gap:.5rem;font-size:1rem;font-weight:700;display:flex}.study-body{flex:1;padding:1.25rem;overflow-y:auto}.vocab-card{background-color:var(--bg-primary);border:1px solid var(--border-color);border-radius:8px;margin-bottom:.85rem;padding:.85rem}.vocab-card-header{justify-content:space-between;align-items:baseline;margin-bottom:.25rem;display:flex}.vocab-word{color:var(--text-primary);font-size:.95rem;font-weight:700}.vocab-type{color:var(--accent-color);font-size:.75rem;font-style:italic}.vocab-ipa{color:var(--text-secondary);margin-bottom:.4rem;font-size:.75rem}.vocab-definition{color:var(--text-primary);margin-bottom:.4rem;font-size:.85rem;font-weight:500}.vocab-context{color:var(--text-secondary);border-left:2px solid var(--border-color);margin-bottom:.4rem;padding-left:.5rem;font-size:.8rem;font-style:italic}.vocab-explanation{color:var(--text-muted);font-size:.75rem}.grammar-card{background-color:var(--bg-primary);border:1px solid var(--border-color);border-radius:8px;margin-bottom:.85rem;padding:.85rem}.grammar-structure{color:var(--accent-color);margin-bottom:.35rem;font-size:.9rem;font-weight:700}.grammar-meaning{color:var(--text-primary);margin-bottom:.4rem;font-size:.85rem;font-weight:500}.grammar-context{color:var(--text-secondary);border-left:2px solid var(--border-color);margin-bottom:.4rem;padding-left:.5rem;font-size:.8rem;font-style:italic}.grammar-explanation{color:var(--text-muted);font-size:.75rem}.saved-drawer-overlay{z-index:100;background-color:#0006;justify-content:flex-end;animation:.2s ease-out fadeIn;display:flex;position:fixed;inset:0}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.saved-drawer{background-color:var(--bg-card);width:450px;height:100%;box-shadow:var(--shadow-lg);flex-direction:column;animation:.25s cubic-bezier(.16,1,.3,1) slideIn;display:flex}@keyframes slideIn{0%{transform:translate(100%)}to{transform:translate(0)}}.saved-header{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;padding:1.25rem;display:flex}.saved-title{color:var(--text-primary);align-items:center;gap:.5rem;font-size:1.1rem;font-weight:700;display:flex}.saved-body{flex:1;padding:1.25rem;overflow-y:auto}.saved-word-item{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:flex-start;padding:.85rem;display:flex}.saved-word-item:last-child{border-bottom:none}.delete-saved-btn{color:#ef4444;cursor:pointer;background:0 0;border:none;border-radius:4px;padding:.25rem}.delete-saved-btn:hover{background-color:#ef44441a}.empty-saved{height:200px;color:var(--text-muted);flex-direction:column;justify-content:center;align-items:center;gap:.5rem;font-size:.9rem;display:flex}.no-data{text-align:center;color:var(--text-muted);padding:2rem;font-size:.9rem;font-style:italic}@media (width<=900px){.app-container{flex-direction:column}.sidebar{border-right:none;border-bottom:1px solid var(--border-color);width:100%;height:auto}.sidebar-scrollable,.study-panel{display:none}.parallel-layout{grid-template-columns:1fr}.column-divider{display:none}.scroll-column{padding:1.5rem 1rem}.saved-drawer{width:100%}}@keyframes cardFlash{0%{background-color:var(--accent-light);box-shadow:0 0 0 2px var(--accent-color)}50%{background-color:var(--accent-light);box-shadow:0 0 0 4px var(--accent-color)}to{background-color:var(--bg-primary);box-shadow:none}}.vocab-card.flash-card,.grammar-card.flash-card{animation:1.5s ease-out cardFlash}.vocab-card-clickable,.grammar-card-clickable{cursor:pointer;transition:transform .15s,box-shadow .15s,border-color .15s}.vocab-card-clickable:hover,.grammar-card-clickable:hover{border-color:var(--accent-color);transform:translate(-2px);box-shadow:2px 2px 12px #0000001f}.vocab-scroll-icon{opacity:0;color:var(--accent-color);flex-shrink:0;transition:opacity .2s}.vocab-card-clickable:hover .vocab-scroll-icon,.grammar-card-clickable:hover .vocab-scroll-icon{opacity:1}.vocab-vi{color:var(--accent-color);margin-bottom:.35rem;font-size:.82rem;font-weight:600}@keyframes readerWordFlash{0%{background:var(--vocab-highlight-bg);outline:2px solid var(--vocab-highlight);border-radius:3px}40%{background:var(--vocab-highlight);outline:2px solid var(--vocab-highlight);color:#fff;border-radius:3px}to{background:var(--vocab-highlight-bg);border-radius:3px;outline:none}}.highlighted-term.flash-reader-word{animation:1.8s ease-out readerWordFlash}