:root{--book-accent:#15b8cf;--book-accent-strong:#008aa0;--book-navy:#102238;--book-text:#172033;--book-muted:#6b778c;--book-border:#e1e7ed;--book-surface:#fff;--book-canvas:#f4f7f9;--book-radius:10px;--book-shadow:0 10px 28px #10223814}.book-site-header,.book-site-footer,.book-home-page,.book-library-page,.book-detail-page,.book-search-page{color:var(--book-text);font:14px/1.6 Arial,Microsoft YaHei,sans-serif}.book-site-header *,.book-site-footer *,.book-home-page *,.book-library-page *,.book-detail-page *,.book-search-page *{box-sizing:border-box}.book-site-header a,.book-site-footer a,.book-home-page a,.book-library-page a,.book-detail-page a,.book-search-page a{color:inherit;text-decoration:none}.book-shell{width:calc(100% - clamp(28px,5vw,64px));max-width:1180px;margin-inline:auto}.book-search-results.book-shell{width:calc(100% - clamp(28px,5vw,64px))!important;max-width:1180px!important}body:has(.book-search-page) .book-search-grid article{width:100%!important;height:auto!important;min-height:0!important;display:grid!important}body:has(.book-search-page) .book-search-cover{flex:auto!important;width:auto!important;height:auto!important;margin-right:0!important}body:has(.book-search-page) .book-search-cover img{width:100%!important;height:100%!important}body:has(.book-search-page) .book-search-grid article>div{width:auto!important;height:auto!important}.book-site-header{background:#13243a;border-bottom:0}.book-topbar{background:var(--book-navy);color:#dbe6f3;min-height:36px}.book-topbar>.book-shell{align-items:center;min-height:36px;display:flex}.book-topbar>.book-shell>a{font-weight:700}.book-topbar nav{align-items:center;gap:16px;margin-left:auto;display:flex}.book-topbar nav>span{color:#fff}.book-topbar nav .legacy-login-trigger{color:#fff;cursor:pointer;background:0 0;border:1px solid #ffffff73;border-radius:3px;height:28px;padding-inline:12px}.book-header-ad{width:calc(100% - clamp(28px,5vw,64px))!important;max-width:1180px!important;margin:12px auto 0!important}.book-brand-row{color:#fff;align-items:center;gap:clamp(24px,4vw,56px);min-height:74px;display:flex}.book-brand-row h1{flex:none;margin:0}.book-brand-row h1 a{align-items:center;gap:16px;display:flex}.book-brand-row h1 img{object-fit:contain;width:150px;height:50px;display:block}.book-brand-row h1 strong{color:#fff;white-space:nowrap;border-left:1px solid #ffffff47;padding-left:16px;font-size:22px;line-height:32px}.book-main-nav{gap:10px;display:flex}.book-main-nav a{color:#fff;border-radius:4px;padding:9px 16px;font-size:16px;font-weight:700}.book-main-nav a:hover{color:#fff;background:#ffffff1a}.book-search{background:#101e31;border:1px solid #263c58;width:30vw;max-width:340px;height:40px;margin-left:auto;display:flex}.book-search input{color:#fff;background:0 0;border:0;border-radius:0;flex:1;min-width:0;padding:0 12px}.book-search input::placeholder{color:#ffffff7a}.book-search input:focus{outline:0}.book-search button{background:var(--search-action,#26d1e0);color:#fff;cursor:pointer;border:0;border-radius:0;width:64px;font-size:14px}.book-search button:after{content:"搜索"}.book-home-page,.book-library-page,.book-detail-page,.book-search-page{background:var(--book-canvas)}.book-home-page{padding-block:24px 40px}.book-hero{grid-template-columns:minmax(260px,300px) minmax(0,1fr) minmax(240px,280px);gap:20px;display:grid}.book-carousel,.book-featured-copy,.book-wanted,.book-video-lessons,.book-home-rankings>section,.book-category-section,.book-new-shelf{background:var(--book-surface);border:1px solid var(--book-border);border-radius:var(--book-radius);box-shadow:0 3px 14px #10223809}.book-carousel{grid-template-columns:minmax(0,1fr) 58px;gap:8px;padding:10px;display:grid}.book-carousel>a{aspect-ratio:5/7;min-width:0;display:block}.book-carousel>a>img{object-fit:cover;width:100%;height:100%;display:block}.book-carousel-thumbs{flex-direction:column;gap:7px;min-width:0;display:flex}.book-carousel-thumbs button{border:1px solid var(--book-border);cursor:pointer;opacity:.62;background:#fff;border-radius:3px;flex:1;min-height:0;padding:2px;overflow:hidden}.book-carousel-thumbs button.is-active{border-color:var(--book-accent);box-shadow:0 0 0 1px var(--book-accent);opacity:1}.book-carousel-thumbs img{object-fit:cover;width:100%;height:100%;display:block}.book-carousel>p{color:var(--book-muted);text-overflow:ellipsis;white-space:nowrap;grid-column:1/-1;margin:2px 2px 0;overflow:hidden}.book-featured-copy{padding:18px 20px}.book-featured-copy article{border-bottom:1px solid var(--book-border);padding-block:13px}.book-featured-copy article:first-child{padding-top:0}.book-featured-copy h2{margin:0 0 7px;font-size:18px;line-height:1.45}.book-featured-copy h2 a{color:var(--book-navy)}.book-featured-copy h2 a:hover{color:var(--book-accent-strong)}.book-featured-copy article p{color:var(--book-muted);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin:0;display:-webkit-box;overflow:hidden}.book-featured-copy nav{grid-template-columns:repeat(12,minmax(0,1fr));gap:8px 16px;padding-top:16px;display:grid}.book-featured-copy nav a{color:#42536b;overflow-wrap:anywhere;white-space:normal;grid-column:span 4;min-width:0;font-size:13px}.book-featured-copy nav a:nth-last-child(2){grid-column:span 5}.book-featured-copy nav a:last-child{grid-column:span 7}.book-featured-copy nav a:before{color:var(--book-accent);content:"•";margin-right:6px}.book-hero-side{flex-direction:column;gap:14px;min-width:0;display:flex}.book-wanted{background:linear-gradient(145deg,#f0fbfc,#fff);padding:20px}.book-wanted h2{margin:0 0 6px;font-size:19px}.book-wanted p{color:var(--book-muted);margin:0 0 16px}.book-wanted button{background:var(--book-accent);color:#fff;cursor:pointer;border:0;border-radius:4px;width:100%;min-height:40px;padding:0 22px;font-weight:700}.book-video-lessons{flex:1;padding:16px 18px}.book-video-lessons h2,.book-hero-side>section h2{border-bottom:1px solid var(--book-border);margin:0 0 10px;padding-bottom:9px;font-size:18px;position:relative}.book-video-lessons h2:after,.book-hero-side>section h2:after{background:var(--book-accent);content:"";width:52px;height:2px;position:absolute;bottom:-1px;left:0}.book-video-lessons ul{grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 12px;margin:0;padding:0;list-style:none;display:grid}.book-video-lessons li{min-width:0}.book-home-page .book-video-lessons button{color:#526178;cursor:pointer;text-align:left;white-space:normal;background:0 0;border:0;align-items:flex-start;width:100%;padding:7px 6px;line-height:1.4;display:flex;min-width:0!important;min-height:40px!important}.book-video-lessons button:before{color:var(--book-accent);content:"▶";flex:none;margin:4px 7px 0 0;font-size:9px}.book-video-lessons button span{overflow-wrap:anywhere;min-width:0}.book-hero-side>section:not(.book-video-lessons){display:none}.book-new-shelf{margin-top:20px;padding:0 18px 12px}.book-new-shelf>header,.book-category-section>header{border-bottom:1px solid var(--book-border);align-items:center;min-height:52px;display:flex;position:relative}.book-new-shelf>header:after,.book-category-section>header:after{background:var(--book-accent);content:"";width:64px;height:3px;position:absolute;bottom:-1px;left:0}.book-new-shelf>header h2,.book-category-section>header h2{margin:0;font-size:20px}.book-new-shelf-carousel{position:relative}.book-new-shelf-window{scrollbar-width:none;scroll-snap-type:x mandatory;padding:16px 36px 8px;overflow:auto hidden}.book-new-shelf-window::-webkit-scrollbar{display:none}.book-new-shelf-strip{gap:20px;width:max-content;display:flex}.book-new-shelf-card{scroll-snap-align:start;width:128px}.book-new-shelf-card>a{aspect-ratio:5/7;background:#edf1f4;border-radius:5px;display:block;overflow:hidden}.book-new-shelf-card img{object-fit:cover;width:100%;height:100%;transition:transform .2s;display:block}.book-new-shelf-card:hover img{transform:scale(1.035)}.book-new-shelf-card h3{text-overflow:ellipsis;white-space:nowrap;margin:8px 0 0;font-size:14px;line-height:21px;overflow:hidden}.book-new-shelf-card p{color:var(--book-muted);text-overflow:ellipsis;white-space:nowrap;margin:1px 0;font-size:12px;overflow:hidden}.book-new-shelf-previous,.book-new-shelf-next{border:1px solid var(--book-border);cursor:pointer;z-index:2;background:#fff;border-radius:50%;width:34px;height:34px;position:absolute;top:82px;box-shadow:0 4px 12px #1022381f}.book-new-shelf-previous{left:0}.book-new-shelf-next{right:0}.book-new-shelf-previous:before{content:"‹"}.book-new-shelf-next:before{content:"›"}.book-new-shelf-previous:before,.book-new-shelf-next:before{color:var(--book-navy);font-size:24px;line-height:26px}.book-home-ads{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:20px;display:grid}.book-home-ad{width:100%!important;max-width:100%!important}.book-home-content{grid-template-columns:230px minmax(0,1fr);align-items:start;gap:20px;margin-top:20px;display:grid}.book-home-rankings{flex-direction:column;gap:16px;display:flex;position:sticky;top:18px}.book-home-rankings>section{overflow:hidden}.book-home-rankings h2{border-bottom:1px solid var(--book-border);margin:0;padding:13px 16px;font-size:18px;position:relative}.book-home-rankings h2:before{background:var(--book-accent);content:"";width:3px;height:18px;position:absolute;top:18px;left:0}.book-ranking-list{margin:0;padding:8px 14px 12px;list-style:none}.book-ranking-list li{border-bottom:1px dashed var(--book-border);align-items:center;gap:9px;min-width:0;min-height:34px;display:flex}.book-ranking-list b{color:#66758a;text-align:center;background:#eef2f5;border-radius:3px;flex:0 0 22px;font-size:12px}.book-ranking-list .is-top b{background:var(--book-accent);color:#fff}.book-ranking-list a{text-overflow:ellipsis;white-space:nowrap;font-size:13px;overflow:hidden}.book-category-groups{flex-direction:column;gap:16px;min-width:0;display:flex}.book-category-section{margin:0;padding:0 18px 18px}.book-category-section>header span{color:#e77d26;margin-left:8px;font-size:12px}.book-category-section>header>a{color:var(--book-accent-strong);margin-left:auto;font-size:13px}.book-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:22px;padding-top:18px;display:grid}.book-grid-card{min-width:0}.book-grid-cover{aspect-ratio:5/7;background:#edf1f4;border:1px solid #e8edf1;border-radius:5px;display:block;position:relative;overflow:hidden}.book-grid-cover>img{object-fit:cover;width:100%;height:100%;transition:transform .2s;display:block}.book-grid-cover:hover>img{transform:scale(1.035)}.book-grid-cover>b,.book-library-cover>b{color:#fff;z-index:1;background:#ef4d4d;border-radius:0 0 0 4px;padding:0 7px;font-size:11px;line-height:25px;position:absolute;top:0;right:0}.book-grid-card h3{text-overflow:ellipsis;white-space:nowrap;margin:9px 0 2px;font-size:14px;line-height:21px;overflow:hidden}.book-grid-card>p{color:var(--book-muted);text-overflow:ellipsis;white-space:nowrap;margin:0;font-size:12px;overflow:hidden}.book-library-page,.book-search-page{padding-block:24px 44px}.book-library-layout{grid-template-columns:220px minmax(0,1fr);align-items:start;gap:20px;min-width:0;display:grid}.book-category-nav,.book-library-results,.book-search-results{border:1px solid var(--book-border);border-radius:var(--book-radius);background:#fff;overflow:hidden}.book-category-nav,.book-library-results,.book-search-results,.book-library-grid{width:100%;min-width:0;max-width:100%}.book-category-nav h2{background:var(--book-navy);color:#fff;margin:0;padding:14px 16px;font-size:18px}.book-category-nav nav{flex-direction:column;padding:8px;display:flex}.book-category-nav a{border-radius:4px;padding:0 12px;line-height:40px}.book-category-nav a.is-active,.book-category-nav a:hover{color:var(--book-accent-strong);background:#e9f8fa;font-weight:700}.book-library-results,.book-search-results{padding:20px}.book-library-results>h1,.book-search-results>header h1{border-bottom:1px solid var(--book-border);margin:0 0 20px;padding:0 0 12px;font-size:22px;position:relative}.book-library-results>h1:after,.book-search-results>header h1:after{background:var(--book-accent);content:"";width:72px;height:3px;position:absolute;bottom:-1px;left:0}.book-search-results>header h1{font-size:18px}.book-search-results>header h1 span{color:var(--book-accent-strong)}.book-library-grid,.book-search-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;display:grid}.book-library-grid article,.book-search-grid article{border:1px solid var(--book-border);background:#fff;border-radius:7px;grid-template-columns:116px minmax(0,1fr);gap:15px;min-width:0;padding:12px;transition:box-shadow .2s,transform .2s;display:grid}.book-library-grid article:hover,.book-search-grid article:hover{box-shadow:var(--book-shadow);transform:translateY(-2px)}.book-library-cover,.book-search-cover{aspect-ratio:5/7;background:#edf1f4;border-radius:4px;display:block;position:relative;overflow:hidden}.book-library-cover img,.book-search-cover img{object-fit:cover;width:100%;height:100%;display:block}.book-library-grid article>div,.book-search-grid article>div{min-width:0}.book-library-grid h2,.book-search-grid h2{-webkit-line-clamp:2;-webkit-box-orient:vertical;margin:0 0 10px;font-size:17px;line-height:1.45;display:-webkit-box;overflow:hidden}.book-library-grid dl,.book-search-grid dl{color:var(--book-muted);min-width:0;margin:4px 0;display:flex}.book-library-grid dt,.book-search-grid dt{flex:none}.book-library-grid dd,.book-search-grid dd{text-overflow:ellipsis;white-space:nowrap;margin:0;overflow:hidden}.book-rating-image{width:auto;max-width:100%;height:15px}.book-pagination{flex-wrap:wrap;justify-content:center;align-items:center;gap:12px;margin-top:28px;display:flex}.book-page-buttons{flex-wrap:wrap;justify-content:center;gap:6px;display:flex}.book-page-buttons>a,.book-page-buttons>span{border:1px solid var(--book-border);border-radius:4px;justify-content:center;align-items:center;min-width:36px;min-height:36px;padding:4px 10px;display:flex}.book-page-buttons>.current{background:var(--book-accent);border-color:var(--book-accent);color:#fff}.book-page-buttons>.disabled{color:#b3bbc6}.book-page-go{color:var(--book-muted);align-items:center;gap:5px;display:flex}.book-page-go label{align-items:center;display:flex}.book-page-go input{border:1px solid var(--book-border);text-align:center;width:48px;height:32px;margin-inline:4px}.book-page-go button{background:var(--book-navy);color:#fff;border:0;border-radius:3px;height:32px;padding-inline:12px}.book-search-pagination{flex-wrap:wrap;justify-content:center;align-items:center;gap:7px;margin-top:28px;display:flex}.book-search-pagination>a,.book-search-pagination>span{border:1px solid var(--book-border);border-radius:4px;justify-content:center;align-items:center;min-width:40px;min-height:40px;padding:5px 11px;display:inline-flex}.book-search-pagination>span:not(.current){color:#9ba6b4}.book-search-pagination>.current{background:var(--book-accent);border-color:var(--book-accent);color:#fff}.book-search-load-more{display:none}.book-detail-page{padding-block:24px 44px}.book-detail-layout{grid-template-columns:minmax(0,1fr) 260px;align-items:start;gap:20px;display:grid}.book-detail-main{min-width:0}.book-detail-summary,.book-catalog,.book-comments,.book-related{border:1px solid var(--book-border);border-radius:var(--book-radius);background:#fff}.book-detail-summary{grid-template-columns:190px minmax(0,1fr);gap:24px;padding:22px;display:grid}.book-detail-cover{aspect-ratio:5/7;background:#edf1f4;border-radius:6px;display:block;overflow:hidden}.book-detail-cover img{object-fit:cover;width:100%;height:100%;display:block}.book-detail-summary>div{min-width:0}.book-detail-summary h1{margin:0 0 14px;font-size:clamp(22px,2vw,28px);line-height:1.35}.book-detail-summary p{color:#55647a;flex-wrap:wrap;align-items:center;gap:5px;margin:7px 0;display:flex}.book-detail-description{color:var(--book-muted);-webkit-line-clamp:4;-webkit-box-orient:vertical;margin-top:14px;line-height:1.8;display:-webkit-box;overflow:hidden}.book-detail-summary nav{flex-wrap:wrap;align-items:center;gap:10px;margin-top:18px;display:flex}.book-detail-summary nav>a,.book-detail-summary nav .book-detail-shelf{border:1px solid var(--book-accent);border-radius:4px;justify-content:center;align-items:center;min-height:40px;padding:0 22px;font-weight:700;display:inline-flex}.book-detail-summary nav>a{background:var(--book-accent);color:#fff}.book-detail-summary nav .book-detail-shelf{color:var(--book-accent-strong);cursor:pointer;background:#fff}.book-detail-summary nav .book-detail-shelf.is-joined{background:var(--book-accent);color:#fff}.book-shelf-message{color:var(--book-accent-strong);font-size:12px}.book-hidden-login{display:none!important}.book-catalog,.book-comments{margin-top:18px;padding:0 20px 20px}.book-catalog>h2,.book-comments>h2,.book-related>h2{border-bottom:1px solid var(--book-border);margin:0;padding:14px 0;font-size:20px;position:relative}.book-catalog>h2:after,.book-comments>h2:after,.book-related>h2:after{background:var(--book-accent);content:"";width:58px;height:3px;position:absolute;bottom:-1px;left:0}.book-catalog-list{grid-template-columns:repeat(2,minmax(0,1fr));max-height:260px;display:grid;overflow:hidden}.book-catalog.is-expanded .book-catalog-list{max-height:none}.book-catalog-list section{border-bottom:1px dashed var(--book-border);min-width:0;padding:3px 10px 3px 0}.book-catalog-list h3{margin:0;font-size:14px}.book-catalog-list h3 a,.book-catalog-list li a{text-overflow:ellipsis;white-space:nowrap;line-height:34px;display:block;overflow:hidden}.book-catalog-list ul{margin:0;padding:0 0 0 15px;list-style:none}.book-catalog-toggle{color:var(--book-accent-strong);cursor:pointer;background:#eef7f8;border:0;border-radius:4px;width:100%;min-height:38px;margin-top:14px}.book-related{min-width:0;padding:0 16px 16px;position:sticky;top:18px}.book-related-list{width:100%;min-width:0;max-width:100%}.book-related article{border-bottom:1px solid var(--book-border);grid-template-columns:70px minmax(0,1fr);gap:10px;padding:14px 0;display:grid}.book-related article>a{aspect-ratio:5/7;border-radius:3px;overflow:hidden}.book-related article>a img{object-fit:cover;width:100%;height:100%;display:block}.book-related article>div{min-width:0}.book-related h3{text-overflow:ellipsis;white-space:nowrap;margin:0;font-size:14px;line-height:1.45;overflow:hidden}.book-related p{color:var(--book-muted);text-overflow:ellipsis;white-space:nowrap;margin:2px 0;font-size:12px;overflow:hidden}.book-related .book-rating-image{height:12px}.book-comment-list{margin:0;padding:8px 0;list-style:none}.book-comment-list>li{border-bottom:1px solid var(--book-border);padding:16px 0;display:flex}.book-comment-list li>img,.book-comment-avatar{object-fit:cover;border-radius:50%;flex:0 0 40px;width:40px;height:40px}.book-comment-avatar{background:var(--book-accent);color:#fff;justify-content:center;align-items:center;display:flex}.book-comment-list li>div{flex:1;min-width:0;padding-left:12px}.book-comment-list header{align-items:center;gap:8px;display:flex}.book-comment-list header strong{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.book-comment-list time{color:#9aa4b2;white-space:nowrap;margin-left:auto;font-size:12px}.book-comment-list p{overflow-wrap:anywhere;background:#f6f8fa;border-radius:7px;margin:8px 0;padding:10px 12px;line-height:1.75}.book-comment-list ul{background:#f7fbfc;border-radius:6px;margin:8px 0 0;padding:0 10px;list-style:none}.book-comment-reply-button{color:var(--book-accent-strong);cursor:pointer;background:0 0;border:0;min-height:32px;padding:0 4px}.book-comment-empty{color:var(--book-muted);text-align:center;background:#f7f9fb;border-radius:6px;margin:18px 0;padding:34px}.book-comment-pages{flex-wrap:wrap;justify-content:center;gap:6px;display:flex}.book-comment-pages button{border:1px solid var(--book-border);background:#fff;border-radius:3px;min-width:34px;min-height:34px}.book-comment-pages button.is-active{background:var(--book-accent);border-color:var(--book-accent);color:#fff}.book-comment-auto-status{display:none}.book-comment-reply-editor{background:#f7f9fb;border-radius:6px;margin-top:14px;padding:10px}.book-comment-reply-editor textarea{border:1px solid var(--book-border);resize:vertical;border-radius:4px;width:100%;min-height:70px;padding:9px;display:block}.book-comment-reply-editor button{background:var(--book-accent);color:#fff;border:0;border-radius:3px;min-height:34px;margin-top:7px;padding-inline:18px}.book-comment-reply-editor small{color:var(--book-muted);margin-left:10px}.book-comment-editor{border-top:1px solid var(--book-border);grid-template-columns:42px minmax(0,1fr);gap:10px;margin-top:18px;padding-top:16px;display:grid}.book-comment-editor h3{grid-column:1/-1;margin:0;font-size:18px}.book-comment-editor-avatar{object-fit:cover;border-radius:50%;width:40px;height:40px}.book-comment-editor textarea{border:1px solid var(--book-border);resize:vertical;border-radius:5px;width:100%;min-height:96px;padding:10px}.book-comment-editor>button{background:var(--book-accent);color:#fff;border:0;border-radius:4px;grid-column:2;justify-self:end;min-height:38px;padding:0 22px}.book-comment-editor>p{color:#d33;grid-column:2;margin:0}.book-action-layer,.book-video-layer{z-index:10000;justify-content:center;align-items:center;padding:20px;display:flex;position:fixed;inset:0}.book-action-mask{background:#081322ad;border:0;position:absolute;inset:0}.book-want-dialog{background:#fff;border-radius:10px;width:100%;max-width:460px;padding:0 24px 22px;position:relative;box-shadow:0 18px 48px #00000042}.book-want-dialog header{border-bottom:1px solid var(--book-border);justify-content:space-between;align-items:center;margin:0 -24px 16px;padding:0 12px 0 20px;font-size:18px;font-weight:700;line-height:52px;display:flex}.book-want-dialog header button{cursor:pointer;background:0 0;border:0;min-width:44px;height:44px;font-size:24px}.book-want-dialog label{align-items:flex-start;margin:12px 0;display:flex}.book-want-dialog label span{width:58px;line-height:38px}.book-want-dialog input,.book-want-dialog textarea{border:1px solid var(--book-border);border-radius:4px;flex:1;min-width:0;padding:9px}.book-want-dialog>button{background:var(--book-accent);color:#fff;border:0;border-radius:4px;min-height:44px;margin-left:58px;padding-inline:24px}.book-want-dialog>p{color:#d33;margin-left:12px;display:inline}.book-video-layer>div{aspect-ratio:16/9;width:100%;max-width:900px;position:relative}.book-video-layer video{background:#000;width:100%;height:100%}.book-video-layer>div>button{color:#fff;background:#172033;border:1px solid #fff;border-radius:50%;width:44px;height:44px;font-size:24px;position:absolute;top:-12px;right:-12px}.book-right-tools{z-index:100;position:fixed;bottom:90px;right:22px}.book-right-tools button{background:var(--book-navy);color:#fff;cursor:pointer;border:0;border-radius:50%;width:44px;height:44px;box-shadow:0 6px 16px #10223840}.book-right-tools button:before{content:"↑";font-size:20px}.book-site-footer{background:var(--book-navy);color:#b9c6d6;text-align:center;margin-top:0;padding:24px 0}.book-site-footer p{margin:2px 0}.book-privacy-page{background:var(--book-canvas);min-height:calc(100dvh - 241px);padding:40px 0}.book-privacy-content{border:1px solid var(--book-border);border-radius:var(--book-radius);background:#fff;max-width:920px;padding:clamp(24px,4vw,44px)}.book-privacy-content h1{margin:0 0 18px;font-size:clamp(24px,3vw,32px);line-height:1.3}.book-privacy-content p{color:#4e5d72;margin:0;font-size:16px;line-height:1.8}.book-privacy-content .book-privacy-status{border-left:3px solid var(--book-accent);color:var(--book-muted);margin-top:18px;padding:10px 14px}@media (max-width:1100px){.book-hero{grid-template-columns:280px minmax(0,1fr)}.book-hero-side{grid-column:1/-1;grid-template-columns:280px minmax(0,1fr);display:grid}.book-wanted{height:100%}.book-video-lessons ul{grid-template-columns:repeat(3,minmax(0,1fr))}.book-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.book-home-content{grid-template-columns:210px minmax(0,1fr)}.book-detail-layout{grid-template-columns:minmax(0,1fr) 230px}}@media (max-width:900px){.book-shell{width:calc(100% - 32px)}.book-brand-row{gap:20px}.book-brand-row h1 strong{font-size:19px}.book-main-nav{gap:2px}.book-main-nav a{padding-inline:10px}.book-search{width:min(300px,34vw)}.book-hero{grid-template-columns:minmax(220px,250px) minmax(0,1fr)}.book-featured-copy article:nth-child(n+3){display:none}.book-featured-copy nav{padding-bottom:0;overflow:visible}.book-featured-copy nav a{min-height:32px}.book-hero-side{grid-template-columns:minmax(220px,250px) minmax(0,1fr)}.book-video-lessons{min-width:0}.book-home-content{flex-direction:column;display:flex}.book-home-rankings{grid-template-columns:repeat(2,minmax(0,1fr));width:100%;display:grid;position:static}.book-category-groups{width:100%}body:has(.book-home-page) .book-video-lessons button{min-width:44px!important;min-height:44px!important}.book-library-layout{grid-template-columns:minmax(0,1fr)}.book-category-nav{min-width:0;max-width:100%;overflow:hidden}.book-category-nav h2{border-bottom:1px solid var(--book-border);color:var(--book-text);background:#fff}.book-category-nav nav{scrollbar-width:none;flex-direction:row;width:100%;max-width:100%;padding:8px;overflow-x:auto}.book-category-nav nav::-webkit-scrollbar{display:none}.book-category-nav a{white-space:nowrap;flex:none}.book-detail-layout{grid-template-columns:minmax(0,1fr)}.book-related{position:static}.book-related-list{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;display:grid}.book-related article{border:1px solid var(--book-border);border-radius:5px;padding:10px}}@media (max-width:767px){body:has(.book-shell) .fx-mobile-open-app{min-height:44px}body:has(.book-error-page) .fx-mobile-open-app{min-height:44px}.book-site-header{display:none}.book-home-page,.book-library-page,.book-detail-page,.book-search-page{padding-block:12px calc(74px + env(safe-area-inset-bottom))}.book-shell{width:calc(100% - 24px)}.book-hero{flex-direction:column;gap:12px;display:flex}.book-carousel{grid-template-rows:auto 1fr;grid-template-columns:112px minmax(0,1fr);align-items:start;width:100%;max-width:none;margin:0}.book-carousel>a{grid-area:1/1/3}.book-carousel-thumbs{flex-direction:row;grid-column:2;gap:5px;height:48px}.book-carousel-thumbs button{flex:44px;min-width:44px}.book-carousel>p{white-space:normal;-webkit-line-clamp:4;-webkit-box-orient:vertical;grid-column:2;margin:0;line-height:1.65;display:-webkit-box;overflow:hidden}.book-featured-copy{padding:12px 14px}.book-featured-copy article{padding-block:8px}.book-featured-copy article:nth-child(n+2){display:none}.book-featured-copy h2{font-size:16px}.book-featured-copy nav{gap:6px 10px;padding-top:10px}.book-hero-side{grid-template-columns:1fr;gap:12px;display:grid}.book-wanted,.book-video-lessons{padding:12px}.book-wanted h2,.book-video-lessons h2{font-size:17px}.book-wanted p{margin-bottom:10px;font-size:13px}.book-wanted button{min-height:44px}.book-video-lessons ul{grid-template-columns:repeat(2,minmax(0,1fr))}.book-home-page .book-video-lessons button{padding-inline:4px;font-size:13px;min-height:44px!important}.book-new-shelf{padding-inline:12px}.book-new-shelf>header,.book-category-section>header{min-height:48px}.book-new-shelf>header h2,.book-category-section>header h2{font-size:18px}.book-new-shelf-window{padding-inline:30px}.book-new-shelf-strip{gap:14px}.book-new-shelf-card{width:112px}.book-new-shelf-previous,.book-new-shelf-next{top:72px}.book-home-ads{grid-template-columns:1fr}.book-home-rankings{scroll-snap-type:x mandatory;gap:12px;display:flex;overflow-x:auto}.book-home-rankings>section{scroll-snap-align:start;flex:0 0 min(82vw,300px)}.book-category-section{padding-inline:12px}.book-category-section>header span{display:none}.book-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px 12px;padding-top:14px}.book-grid-card h3{white-space:normal}.book-library-page,.book-search-page,.book-detail-page{background:#fff}.book-category-nav,.book-library-results,.book-search-results,.book-detail-summary,.book-catalog,.book-comments,.book-related{border-left:0;border-right:0;border-radius:0}.book-library-results,.book-search-results{padding:16px 0}.book-library-results>h1,.book-search-results>header h1{padding-inline:2px;font-size:20px}.book-library-grid,.book-search-grid{grid-template-columns:1fr;gap:12px}.book-library-grid article,.book-search-grid article{grid-template-columns:96px minmax(0,1fr);padding:10px}.book-library-grid h2,.book-search-grid h2{font-size:16px}.book-search-results.book-shell{width:calc(100% - 24px)!important}.book-search-pagination{display:none}.book-search-load-more{color:var(--book-muted);justify-content:center;align-items:center;min-height:72px;padding:14px;display:flex}.book-search-load-more button{border:1px solid var(--book-accent);color:var(--book-accent-strong);background:#fff;border-radius:4px;min-height:44px;padding:0 20px}.book-pagination{gap:8px}.book-page-buttons{gap:4px}.book-page-buttons>a,.book-page-buttons>span{min-width:44px;min-height:44px;padding-inline:7px;font-size:12px}.book-page-go{justify-content:center;width:100%;font-size:12px}.book-page-go input,.book-page-go button{height:44px}.book-detail-summary{grid-template-columns:112px minmax(0,1fr);gap:14px;padding:14px 0}.book-detail-summary h1{margin-bottom:8px;font-size:20px}.book-detail-description{-webkit-line-clamp:5;grid-column:1/-1}.book-detail-summary nav{grid-column:1/-1}.book-detail-summary nav>a,.book-detail-summary nav .book-detail-shelf{min-height:44px;padding-inline:16px}.book-detail-summary p{font-size:13px}.book-catalog,.book-comments{padding-inline:0}.book-catalog-list{grid-template-columns:1fr}.book-catalog-list section{padding-inline:2px}.book-catalog-toggle{min-height:44px}.book-detail-page .book-related{display:none}.book-comment-list>li{padding-block:14px}.book-comment-list li>div{padding-left:9px}.book-comment-list header{flex-direction:column;align-items:flex-start;gap:2px}.book-comment-list time{margin-left:0}.book-comment-list p{margin-top:6px;padding:9px;font-size:14px}.book-comment-reply-button{min-width:44px;min-height:44px}.book-comment-pages{display:none}.book-comment-auto-status{color:var(--book-muted);text-align:center;justify-content:center;align-items:center;min-height:1px;display:flex}.book-comment-auto-status[data-state=loading],.book-comment-auto-status[data-state=error]{min-height:52px;padding:4px 0}.book-comment-auto-status button{border:1px solid var(--book-accent);color:var(--book-accent-strong);background:#fff;border-radius:4px;min-height:44px;padding:0 18px}.book-comment-editor{grid-template-columns:36px minmax(0,1fr)}.book-comment-editor-avatar{width:34px;height:34px}.book-comment-editor>button{min-height:44px}.book-comment-empty{padding:28px 12px}.book-site-footer,.book-right-tools{display:none}.book-privacy-page{min-height:calc(100dvh - var(--fx-mobile-header-height));padding:12px 0 calc(74px + env(safe-area-inset-bottom));background:#fff}.book-privacy-content{border-left:0;border-right:0;border-radius:0;padding:24px 16px}.book-privacy-content p{font-size:15px}.book-want-dialog label{display:block}.book-want-dialog label span{width:auto;line-height:28px;display:block}.book-want-dialog input{min-height:44px}.book-want-dialog>button{width:100%;min-height:44px;margin-left:0}.book-video-layer>div>button{top:4px;right:4px}}@media (min-width:600px) and (max-width:767px){.book-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}@media (max-width:480px){.book-featured-copy nav{grid-template-columns:repeat(2,minmax(0,1fr))}.book-featured-copy nav a,.book-featured-copy nav a:nth-last-child(2){grid-column:span 1}.book-featured-copy nav a:last-child{grid-column:span 2}}@media (max-width:360px){.book-shell{width:calc(100% - 20px)}.book-grid{gap:14px 10px}.book-grid-card h3{font-size:13px}.book-detail-summary{grid-template-columns:96px minmax(0,1fr)}.book-detail-summary h1{font-size:18px}.book-detail-summary nav{gap:7px}.book-detail-summary nav>a,.book-detail-summary nav .book-detail-shelf{padding-inline:12px;font-size:13px}.book-page-buttons>a:nth-child(n+6):not(:last-child){display:none}}