:root{--text:#6b6375;--text-h:#08060d;--bg:#fff;--border:#e5e4e7;--code-bg:#f4f3ec;--accent:#aa3bff;--accent-bg:#aa3bff1a;--accent-border:#aa3bff80;--social-bg:#f4f3ec80;--shadow:#0000001a 0 10px 15px -3px, #0000000d 0 4px 6px -2px;--sans:system-ui, "Segoe UI", Roboto, sans-serif;--heading:system-ui, "Segoe UI", Roboto, sans-serif;--mono:ui-monospace, Consolas, monospace;font:18px/145% var(--sans);letter-spacing:.18px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}@media (width<=1024px){:root{font-size:16px}}@media (prefers-color-scheme:dark){:root{--text:#9ca3af;--text-h:#f3f4f6;--bg:#16171d;--border:#2e303a;--code-bg:#1f2028;--accent:#c084fc;--accent-bg:#c084fc26;--accent-border:#c084fc80;--social-bg:#2f303a80;--shadow:#0006 0 10px 15px -3px, #00000040 0 4px 6px -2px}#social .button-icon{filter:invert()brightness(2)}}body{margin:0}#root{text-align:center;border-inline:1px solid var(--border);box-sizing:border-box;flex-direction:column;width:1126px;max-width:100%;min-height:100svh;margin:0 auto;display:flex}h1,h2{font-family:var(--heading);color:var(--text-h);font-weight:500}h1{letter-spacing:-1.68px;margin:32px 0;font-size:56px}@media (width<=1024px){h1{margin:20px 0;font-size:36px}}h2{letter-spacing:-.24px;margin:0 0 8px;font-size:24px;line-height:118%}@media (width<=1024px){h2{font-size:20px}}p{margin:0}code,.counter{font-family:var(--mono);color:var(--text-h);border-radius:4px;display:inline-flex}code{background:var(--code-bg);padding:4px 8px;font-size:15px;line-height:135%}:root{--primary-color:#1a73e8}body,body.theme-light{--bg-color:#fff;--text-color:#333;--panel-bg:#f5f5f5;--border-color:#e0e0e0;--rhythm-grey:#888}body.theme-dark{--bg-color:#121212;--text-color:#e0e0e0;--panel-bg:#1e1e1e;--border-color:#333;--rhythm-grey:#666}body{background-color:var(--bg-color);color:var(--text-color);margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;overflow:hidden}.app-container{flex-direction:column;width:100vw;height:100dvh;display:flex;position:relative}.bookshelf-grid{flex:1;grid-template-columns:repeat(2,1fr);align-content:start;gap:15px;padding:20px;display:grid;overflow-y:auto}@media (width>=600px){.bookshelf-grid{grid-template-columns:repeat(3,1fr)}}@media (width>=900px){.bookshelf-grid{grid-template-columns:repeat(4,1fr)}}.book-card{background:var(--bg-color);cursor:pointer;border-radius:12px;transition:transform .2s;position:relative;overflow:hidden;box-shadow:0 4px 12px #00000014}.book-card:hover{transform:translateY(-4px)}.book-cover-wrapper{background:#eee;padding-top:140%;position:relative}.book-cover{object-fit:cover;width:100%;height:100%;position:absolute;top:0;left:0}.book-info{text-align:center;border-top:1px solid var(--border-color);padding:10px;font-size:13px;font-weight:600}.btn-delete-book{color:#fff;cursor:pointer;z-index:10;background:#ff0000b3;border:none;border-radius:50%;justify-content:center;align-items:center;width:28px;height:28px;display:flex;position:absolute;top:8px;right:8px}.btn-delete-book:hover{background:red}.reader-view{flex-direction:column;flex:1;height:100%;display:flex}.main-content{background:var(--bg-color);flex-direction:column;flex:1;display:flex;position:relative;overflow:hidden}#viewer{flex:1;width:100%;height:100%;touch-action:none!important}.header{background:var(--panel-bg);border-bottom:1px solid var(--border-color);z-index:10;justify-content:space-between;align-items:center;gap:10px;padding:8px 15px;display:flex}.toolbar{align-items:center;gap:8px;display:flex}.btn{background:var(--primary-color);color:#fff;cursor:pointer;white-space:nowrap;border:none;border-radius:8px;justify-content:center;align-items:center;gap:6px;padding:8px 14px;font-size:13px;font-weight:600;display:flex}.btn-control{min-width:100px}.btn-control.dark{background-color:#444}.btn-icon{color:var(--primary-color);background:0 0;min-width:auto;padding:6px}.select-theme,.voice-select{background:var(--bg-color);color:var(--text-color);border:1px solid var(--border-color);cursor:pointer;border-radius:4px;outline:none;padding:6px;font-size:13px}.nav-btn{color:var(--text-color);opacity:.2;cursor:pointer;z-index:5;background:0 0;border:none;padding:20px 10px;position:absolute;top:50%;transform:translateY(-50%)}.nav-btn:hover{opacity:.8}.nav-btn-left{left:0}.nav-btn-right{right:0}.scoring-panel{background:var(--panel-bg);border-top:1px solid var(--border-color);z-index:10;padding:12px 15px}.feedback-title{color:#888;align-items:center;gap:8px;font-size:12px;font-weight:700;display:flex}.rhythm-display.karaoke-mode{background:var(--bg-color);border:1px solid var(--border-color);color:var(--text-color);text-align:justify;scroll-behavior:smooth;border-radius:8px;max-height:139.2px;padding:12px 15px;font-family:Georgia,serif;font-size:18px;line-height:1.6;overflow-y:auto}.active-word-glow{border-radius:4px;padding:0 4px;transition:all .1s linear;box-shadow:0 0 10px #ffeb3b;color:#000!important;background-color:#ffeb3b!important;font-weight:900!important}.karaoke-badge{color:#fff;background:#28a745;border-radius:4px;margin-left:8px;padding:2px 6px;font-size:10px}.toc-sidebar,.fav-sidebar{background:var(--panel-bg);z-index:100;width:280px;height:100dvh;position:fixed;top:0;box-shadow:5px 0 15px #0000001a}.toc-header{border-bottom:1px solid var(--border-color);justify-content:space-between;padding:20px;display:flex}.toc-content{height:calc(100% - 70px);overflow-y:auto}.toc-item,.fav-item{border-bottom:1px solid var(--border-color);cursor:pointer;padding:15px 20px;font-size:14px}.overlay{z-index:90;background:#0006;position:fixed;inset:0}.selection-popup{z-index:50;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);border:1px solid #fff3;border-radius:8px;position:absolute;box-shadow:0 10px 25px #00000026}.popup-btn{color:#fc0;cursor:pointer;background:#333;border:none;border-radius:8px;padding:8px 16px;font-weight:700}@media (width<=768px){.hide-on-mobile{display:none!important}.show-on-mobile-only{display:block!important}.header{padding:8px 10px}.btn-control{justify-content:center;min-width:45%;padding:10px}.control-toolbar{justify-content:space-between;width:100%}.rhythm-display.karaoke-mode{max-height:116px;padding:10px;font-size:16px;line-height:1.5}}.rhythm-display.ai-mode{background:var(--bg-color);border:1px solid var(--border-color);color:var(--text-color);text-align:left;border-radius:8px;max-height:250px;padding:12px 15px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:15px;line-height:1.6;overflow-y:auto}.rhythm-display.ai-mode b{color:var(--primary-color);background-color:#1a73e81a;border-radius:4px;padding:2px 4px}@media (width<=768px){.rhythm-display.ai-mode{max-height:200px;padding:10px;font-size:14px}}.mobile-bottom-nav{flex-shrink:0;display:none}@media (width<=768px){.mobile-bottom-nav{background:var(--panel-bg);border-top:1px solid var(--border-color);z-index:10;justify-content:space-between;align-items:center;padding:10px 20px;display:flex}.mobile-nav-btn{background:var(--bg-color);border:1px solid var(--border-color);color:var(--text-color);cursor:pointer;border-radius:20px;align-items:center;gap:5px;padding:8px 20px;font-size:14px;font-weight:600;transition:background .2s;display:flex;box-shadow:0 2px 6px #0000000d}.mobile-nav-btn:active{background:var(--border-color)}}