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ul{padding:0;list-style:none}.related-articles li{border-bottom:1px solid var(--line);font-size:13px;padding:14px 0;line-height:1.8}.related-articles a:hover{color:var(--teal)}.detail-layout+.section{margin-bottom:65px}.article-wrap{max-width:1000px;min-height:65vh}.reading{padding:45px 55px;background:#fff;margin:10px 0 65px;border:1px solid var(--line);border-radius:6px;overflow-wrap:anywhere}.reading h1{line-height:1.55;margin-bottom:24px;font-size:34px}.reading>p{line-height:2;margin-bottom:28px}.article-meta{color:var(--muted);font-size:12px;margin-top:-7px;padding-bottom:24px;border-bottom:1px solid var(--line)}.prose{font-size:16px;line-height:2;color:#34485e;padding:26px 0}.prose p{margin:0 0 20px}.prose h2{font-size:24px;margin:30px 0 17px}.prose h3{font-size:19px;margin:23px 0 14px}.prose a{color:var(--teal);text-decoration:underline}.prose img{max-width:100%;height:auto}.prose table{max-width:100%;display:block;overflow:auto;border-collapse:collapse}.prose td,.prose th{border:1px solid var(--line);padding:7px}.article-bottom{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding-top:25px;font-size:13px}.missing-cover{height:100%;display:flex;align-items:center;justify-content:center;flex-direction:column;font-size:26px;color:#4e6680;font-family:serif;border:1px solid #cdd6df;width:100%}.missing-cover small{font-size:10px;margin-top:10px}
@media(min-width:1450px){.hero{gap:100px}}@media(max-width:1100px){.header-inner{gap:20px}.header nav{gap:21px}.hero{gap:35px}.hero h1{font-size:45px}.book-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}@media(max-width:850px){.wrap{padding:0 24px}.header-inner{padding:0 24px;min-height:80px}.brand{font-size:22px}.header nav{gap:17px}.header nav a{font-size:12px}.header-search{display:none}.hero{padding-top:48px;padding-bottom:45px;gap:28px}.hero h1{font-size:39px}.hero-shelf{padding:20px 15px}.hero-books{gap:13px;padding:25px 6px 0}.shelf-title{font-size:13px}.shelf-title small{display:none}.hero-desc{font-size:13px}.search button{font-size:12px;padding:13px}.stage-grid{gap:12px}.stage{padding:20px 14px;gap:12px}.stage-icon{height:37px;width:37px;font-size:20px}.stage h3{font-size:16px}.stage p{font-size:10px}.stage>span:last-child{display:none}.grade-picker{grid-template-columns:repeat(6,1fr);padding:10px;gap:5px}.grade-picker a:nth-child(6n){border-right:0}.catalog-layout{grid-template-columns:170px minmax(0,1fr);gap:22px}.catalog-books{grid-template-columns:repeat(3,minmax(0,1fr));gap:25px 15px}.book-art{padding:23px 17px}.book h3{font-size:12px}.page-heading .search{width:330px}.detail-layout{grid-template-columns:minmax(0,1fr) 260px;gap:22px}.detail-header,.resource-desc{padding:25px}.detail-header h1{font-size:26px}.download-panel{padding:20px}.footer-inner{padding:32px 24px;gap:22px;flex-wrap:wrap}.footer-inner .footer-note{text-align:left}.footer-links{gap:15px}.reading{padding:35px}}
@media(max-width:620px){.wrap{padding:0 20px}.header-inner{padding:0 20px;min-height:77px;flex-wrap:wrap;gap:0}.brand{font-size:21px}.brand b{font-size:20px}.brand-icon{width:37px;height:37px;font-size:23px}.brand small{font-size:9px}.menu-toggle{display:block;margin-left:auto;background:#fff;border:1px solid var(--line);border-radius:4px;padding:7px 12px;font-size:12px}.header nav{display:none;width:100%;gap:0;flex-wrap:wrap;margin:15px 0 8px;padding-top:8px;border-top:1px solid var(--line)}.header nav.open{display:flex}.header nav a{padding:10px 12px;font-size:13px;flex:1;justify-content:center;min-width:30%}.header nav a.active:after{height:2px;left:14px;right:14px}.hero{display:block;padding-top:35px;padding-bottom:30px}.hero h1{font-size:41px;line-height:1.32;margin-top:15px}.hero-kicker{font-size:11px}.hero-desc{font-size:13px;margin-top:18px;margin-bottom:22px}.hero-desc br{display:none}.hero .search{max-width:none}.hero-shelf{margin-top:32px;padding:20px 24px 15px}.shelf-title{font-size:13px}.shelf-title small{display:block;font-size:10px}.hero-books{gap:24px;max-width:350px;margin:auto;padding-top:20px}.hero-books .book-art{aspect-ratio:.78}.hero-shelf>p{font-size:10px}.hot-search{font-size:11px;gap:12px}.stage-grid{grid-template-columns:1fr;gap:10px}.stage{padding:16px 20px;gap:15px}.stage h3{font-size:17px;margin-bottom:2px}.stage p{font-size:12px}.stage-icon{width:39px;height:39px}.stage>span:last-child{display:block;font-size:20px}.section,.grade-section{margin-top:38px}.section-head{margin-bottom:20px;gap:12px}.section-head h2{font-size:25px}.section-head p{font-size:11px;line-height:1.7;max-width:230px}.text-link{font-size:11px}.grade-picker{grid-template-columns:repeat(4,1fr);padding:8px;gap:4px}.grade-picker a{padding:8px 0;font-size:12px;border:0}.book-grid,.catalog-books{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px 16px}.book-art{padding:25px 22px;aspect-ratio:.8}.book h3{font-size:12px}.book-grade,.book-publisher{font-size:10px}.book-subject{font-size:9px}.article-grid{grid-template-columns:1fr;gap:8px}.article-card{padding:18px 0}.article-card h3{font-size:16px}.article-card>div{font-size:12px;-webkit-line-clamp:2}.library-note{padding:20px;margin:25px 0 40px;gap:12px;align-items:flex-start;flex-wrap:wrap}.library-note>div{flex:1}.library-note .outline-button{margin-left:47px;padding:7px 15px;font-size:11px}.library-note strong{font-size:14px}.library-note p{font-size:11px}.footer-inner{padding:28px 20px;gap:23px;display:block}.footer-links{margin:20px 0;display:grid;grid-template-columns:repeat(4,1fr);gap:8px;font-size:11px}.footer-brand{font-size:21px}.footer-inner .footer-note{font-size:10px}.breadcrumb{padding:21px 0;font-size:11px;gap:9px}.page-heading{display:block;margin:8px 0 24px}.page-heading h1{font-size:30px}.page-heading p{font-size:12px}.page-heading .search{width:100%;margin-top:20px;max-width:none}.catalog-layout{display:block;margin-bottom:40px}.filters{margin-bottom:24px}.filters summary{padding:14px 18px;list-style:revert;font-size:13px}.filters form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;padding:17px}.filters label{margin:0;min-width:0}.filters select{padding:10px 6px;font-size:12px}.filters .button,.clear-filter{align-self:center}.clear-filter{margin:0}.filter-tip{display:none}.result-head{font-size:11px}.pagination{gap:5px;margin-top:30px}.pagination a,.pagination span{padding:7px 10px;font-size:11px}.all-articles{margin-bottom:30px}.detail-layout{display:flex;flex-direction:column;gap:25px}.detail-header{padding:23px}.detail-header h1{font-size:26px}.detail-label{font-size:11px}.meta-tags{gap:6px;margin-top:14px}.meta-tags span{font-size:10px;padding:4px 9px}.detail-preview{padding:30px}.detail-preview img{max-height:440px}.resource-desc{padding:25px}.detail-aside{display:flex;flex-direction:column}.download-panel{padding:25px}.download-panel>p{font-size:12px}.related-articles{padding:28px 4px 0}.related-articles ul{margin-bottom:0}.detail-layout+.section{margin-top:30px;margin-bottom:40px}.reading{padding:25px 22px;margin:5px 0 40px}.reading h1{font-size:27px}.prose{font-size:15px;line-height:2}.prose h2{font-size:22px}.prose h3{font-size:18px}.article-meta{font-size:11px}.article-bottom{gap:12px;align-items:center;font-size:11px}.article-bottom .button,.article-bottom .outline-button{padding:10px 12px}.empty{padding:65px 15px}.empty h1{font-size:28px}.empty h2{font-size:23px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
.prose .md-heading{display:block;font-family:'Songti SC','STSong',serif;font-size:23px;line-height:1.5;margin:27px 0 15px;color:var(--ink)}.prose code{font-size:.9em;background:#edf2f6;border-radius:3px;padding:2px 5px}.prose>img,.prose .article-body>img{margin:0 auto 30px;max-height:560px;object-fit:contain}.prose hr{border:0;border-top:1px solid var(--line);margin:25px 0}
.prose .source-image-note{padding:13px 16px;background:#edf2f6;color:#66768a;border-left:3px solid #b5c8d7;font-size:12px;line-height:1.8;margin:0 0 26px}
.prose h2,.prose .md-heading{text-wrap:balance}
.search{position:relative}.suggestions{position:absolute;z-index:30;top:calc(100% + 8px);left:0;right:0;background:#fff;border:1px solid #cbd7e2;border-radius:6px;box-shadow:0 12px 30px #142a4322;max-height:400px;overflow:auto;padding:7px;white-space:normal;text-align:left}.suggestions[hidden]{display:none}.suggestion-group{font-size:10px;color:var(--muted);padding:8px 10px 4px;background:#fff}.suggestion-option{display:block;padding:9px 10px;border-radius:4px;line-height:1.55;font-size:12px;overflow-wrap:anywhere}.suggestion-option>span{display:block}.suggestion-option small{display:block;font-size:10px;color:var(--muted);margin-top:3px}.suggestion-option:hover,.suggestion-option[aria-selected=true]{background:#e8f3f0;color:var(--teal)}.suggestion-more{font-size:11px;color:var(--teal);border-top:1px solid var(--line);margin-top:5px;padding-top:12px}.site-search-page{min-height:65vh;padding-bottom:65px}.search-welcome{background:#fff;border:1px solid var(--line);border-radius:7px;padding:45px;margin:30px 0 70px}.search-welcome h2{font-size:27px}.search-welcome p{font-size:14px;color:var(--muted);margin-top:15px}.search-shortcuts{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}.search-shortcuts a{font-size:12px;padding:7px 14px;border-radius:4px;background:var(--blue)}.search-summary{color:var(--muted);font-size:13px;overflow-wrap:anywhere}.search-summary strong{color:var(--teal)}.search-result-group{margin-top:38px}.search-result-group h2{font-size:26px}.search-result-group h2 small{font-family:-apple-system,BlinkMacSystemFont,'PingFang SC',sans-serif;color:var(--muted);font-size:12px;font-weight:400;margin-left:10px}.search-group-empty{padding:25px;background:#fff;border:1px solid var(--line);font-size:13px;color:var(--muted);border-radius:5px}
@media(max-width:620px){.suggestions{max-height:min(370px,55vh)}.suggestion-option{font-size:12px;padding:10px}.search-welcome{padding:26px 22px}.search-welcome h2{font-size:24px}.search-welcome p{font-size:12px}.search-summary{font-size:12px}.search-result-group h2{font-size:24px}.search-result-group h2 small{font-size:11px}.site-search-page{padding-bottom:40px}.search-group-empty{font-size:12px}}