@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700&display=swap');
:root{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:#242637;background:#f7f8fc;font-size:16px;--purple:#6354ba;--muted:#777b8d}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,select{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid #ac9df1;outline-offset:3px}a{color:inherit;text-decoration:none}.sidebar{position:fixed;inset:0 auto 0 0;width:244px;background:#fff;border-right:1px solid #e9eaf1;padding:37px 24px;display:flex;flex-direction:column}.brand{display:flex;gap:12px;align-items:center;font-family:"Noto Serif SC",serif;font-weight:700;font-size:23px;letter-spacing:2px}.brand-icon{display:grid;place-items:center;background:#6254a8;color:#fff;width:42px;height:46px;border-radius:4px;font-size:25px}.brand small{display:block;font:9px/2.2 sans-serif;letter-spacing:2.3px;color:#808096}.college{font-size:14px;line-height:1.9;margin:29px 7px 39px;color:#575c6e}.college span{font-size:13px;color:#9195a4}.nav-label{font-size:12px;letter-spacing:1px;color:#9296a5;margin:0 13px 14px}nav{display:grid;gap:7px}nav button{border:0;background:none;display:flex;align-items:center;width:100%;text-align:left;padding:13px 12px;border-radius:7px;color:#676c7b;font-size:14px;gap:12px}nav button.active{background:#eeebf9;color:#6551ad;font-weight:600}nav button:hover{background:#f3f1fa}nav .nav-icon{font-size:19px;width:21px;text-align:center}nav .nav-count{margin-left:auto;font-size:12px;font-weight:400}.sidebar-bottom{margin-top:auto;padding:40px 13px 0;color:#9091a0}.little-mark{font-size:35px;color:#c5bfdf}.sidebar-bottom p{font-family:"Noto Serif SC",serif;font-size:15px;line-height:1.9;margin:0 0 18px}.sidebar-bottom small{font-size:9px;letter-spacing:1.8px}.workspace{margin-left:244px}header{height:77px;border-bottom:1px solid #e7e9f1;padding:0 46px;display:flex;align-items:center;justify-content:space-between;background:#fff;font-size:13px;color:#737888}.slash{margin:0 13px;color:#c0c2cd}.header-note{font-size:12px;color:#9195a1}main{max-width:1340px;margin:auto;padding:39px 46px 23px}.intro{display:flex;justify-content:space-between;gap:24px;align-items:center}.eyebrow{font-size:10px;letter-spacing:2.4px;color:#8c80b2;margin:0 0 14px}h1{font:600 32px/1.5 "Noto Serif SC",serif;letter-spacing:1px;margin:0 0 12px}.description{font-size:14px;color:var(--muted);margin:0}.edition{border-left:1px solid #d9d6e5;padding:6px 0 6px 22px;color:#6b6389;font-family:"Noto Serif SC",serif;font-size:14px;white-space:nowrap}.edition span{display:block;font:11px sans-serif;letter-spacing:2px;color:#a09aaF;margin-top:12px}.search-wrap{display:flex;align-items:center;gap:14px;background:white;border:1px solid #dedeea;border-radius:8px;padding:0 18px;margin-top:29px;height:55px;color:#9698aa;box-shadow:0 3px 9px #28214403}.search-wrap input{border:0;outline:0;min-width:0;width:100%;height:100%;background:none;font-size:14px;color:#303044}.search-wrap input::placeholder{color:#9698aa}kbd{white-space:nowrap;font-size:11px;border:1px solid #e8e8ed;border-radius:4px;padding:4px 6px}.start-strip{display:flex;align-items:center;background:#efedf8;border:1px solid #e6e2f4;border-radius:8px;padding:19px 23px;margin-top:18px;gap:18px}.strip-symbol{display:grid;place-items:center;color:#8d7ac3;background:#e3ddf2;width:38px;height:38px;border-radius:50%;font-size:25px}.start-strip strong{font-size:15px;color:#4a405f;font-weight:600}.start-strip p{font-size:13px;color:#8b819e;margin:6px 0 0}.start-strip button{border:0;background:none;color:#7763aa;margin-left:auto;font-size:13px;white-space:nowrap}.start-strip button span{margin-left:12px}.library{margin-top:33px}.section-heading{display:flex;align-items:center;justify-content:space-between}.section-heading>div{display:flex;align-items:center;gap:13px}h2{font-size:19px;margin:0;font-weight:600}#count{font-size:12px;color:#9498a6}.sort{font-size:12px;color:#9295a4}.sort select{font-size:12px;color:#616676;border:0;background:transparent;padding:6px}.filter-row{display:flex;align-items:center;justify-content:space-between;margin:22px 0 21px;gap:12px}#subjects{display:flex;gap:8px}#subjects button{border:1px solid transparent;border-radius:5px;background:transparent;color:#818594;padding:7px 11px;font-size:13px}#subjects button.active{border-color:#e1dced;background:white;color:#6c57a6}#subjects button:hover{background:#eeebf7}.example-label{font-size:11px;color:#9995a5}.books{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:19px}.book{background:#fff;border:1px solid #e7e8ee;border-radius:9px;overflow:hidden;display:flex;flex-direction:column;transition:transform .18s,box-shadow .18s}.book:hover{transform:translateY(-3px);box-shadow:0 8px 23px #2e215c0a;border-color:#d3cbe4}.book-head{padding:21px 21px 18px;border-bottom:1px solid #f0f0f5;position:relative;min-height:135px}.book-meta{font-size:10px;letter-spacing:1.3px;color:var(--tone);display:flex;align-items:center;justify-content:space-between}.book-meta span:last-child{color:#aaa9b3;font-size:10px;letter-spacing:0}.book h3{font:600 21px/1.5 "Noto Serif SC",serif;margin:17px 0 7px;color:#353247}.author{font-size:12px;color:#858594;margin:0}.book-body{padding:17px 21px 0;display:flex;flex-direction:column;flex:1}.book-description{font-size:13px;line-height:1.8;color:#777a8a;margin:0 0 17px;flex:1}.tags{display:flex;gap:6px;flex-wrap:wrap}.tag{font-size:11px;background:#f4f3f8;color:#90839f;padding:4px 7px;border-radius:3px}.card-bottom{border-top:1px solid #f1f1f5;display:flex;justify-content:space-between;align-items:center;padding:13px 0;margin-top:17px}.status{font-size:11px;color:#a09bab}.details{border:0;background:none;color:#75649d;font-size:12px;padding:4px 0}.details:hover{text-decoration:underline}footer{display:flex;justify-content:space-between;border-top:1px solid #e6e7ef;margin-top:37px;padding-top:21px;color:#a2a4b0;font-size:11px}footer b{font-weight:400;margin:0 7px}dialog{border:1px solid #e3dfed;border-radius:14px;padding:34px;width:min(540px,calc(100% - 32px));color:#343245;box-shadow:0 24px 100px #17122629}dialog::backdrop{background:#21193f55;backdrop-filter:blur(3px)}.close{position:absolute;top:12px;right:14px;border:0;background:none;font-size:26px;color:#8f879f}dialog h2{font-family:"Noto Serif SC",serif;font-size:27px;margin:20px 0 12px}dialog p{line-height:1.9;font-size:15px;color:#7c7789}.availability{background:#f2eff8;border-radius:7px;padding:17px;margin-top:24px;font-size:14px;line-height:1.8;color:#776d8c}.availability strong{display:block;color:#5a4b77}#empty{text-align:center;padding:55px 15px;background:#fff;border:1px dashed #d9d4e6;border-radius:10px;color:#888094}#empty button{background:#6554ab;color:#fff;border:0;border-radius:5px;padding:10px 18px}#empty p{font-size:14px}[hidden]{display:none!important}@media(min-width:1500px){main{padding-top:49px}.books{gap:24px}.book-head{min-height:149px}}@media(max-width:1150px){.sidebar{width:214px;padding-left:18px;padding-right:18px}.workspace{margin-left:214px}main{padding:32px 28px}.books{grid-template-columns:repeat(2,minmax(0,1fr))}.edition{display:none}header{padding:0 28px}.example-label{display:none}}@media(max-width:700px){.sidebar{position:static;width:100%;padding:20px 20px 13px;border-right:0;border-bottom:1px solid #e9eaf1}.brand{font-size:21px}.brand small{font-size:8px}.brand-icon{width:36px;height:39px}.college,.nav-label,.sidebar-bottom{display:none}nav{display:flex;overflow:auto;margin-top:19px;gap:6px;padding-bottom:3px}nav button{white-space:nowrap;width:auto;padding:10px 12px;font-size:13px;gap:6px}nav .nav-icon{display:none}nav .nav-count{display:none}.workspace{margin-left:0}header{display:none}main{padding:27px 20px 22px}h1{font-size:26px}.description{font-size:13px;line-height:1.8}.eyebrow{font-size:9px}.search-wrap{margin-top:23px}.start-strip{padding:16px 13px;gap:12px}.start-strip strong{font-size:14px}.start-strip p{font-size:11px}.start-strip button{font-size:12px;padding:0}.strip-symbol{display:none}.books{gap:14px}.book-head{padding:17px;min-height:139px}.book h3{font-size:19px}.book-body{padding:14px 17px 0}.book-description{font-size:12px}.book-meta{font-size:9px;letter-spacing:.5px}.book-meta span:last-child{display:none}.filter-row{margin:18px 0}.sort{font-size:11px}#subjects{gap:2px}#subjects button{font-size:12px;padding:7px 10px}footer{line-height:1.8;gap:16px}footer span:last-child{max-width:115px;text-align:right}}@media(max-width:390px){.books{grid-template-columns:1fr}h1{font-size:23px}.book-head{min-height:0}.book h3{font-size:22px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}

.book-title-row{display:flex;gap:15px;margin-top:17px;align-items:flex-start}.cover{width:63px;height:93px;object-fit:contain;object-position:top;flex-shrink:0}.book h3{margin:0 0 9px;font-size:18px;line-height:1.55}.book-head{min-height:170px}.book-description{font-size:14px}.book-body{padding-top:17px}.book-meta{font-size:12px;letter-spacing:0}.author{line-height:1.65}.details{font-size:14px}.tag{font-size:12px}.status{font-size:12px}#subjects{flex-wrap:wrap}#subjects button{font-size:14px}.example-label{white-space:nowrap}.detail-cover{width:100px;max-height:155px;object-fit:contain;float:right;margin:15px 0 18px 20px}.availability{clear:both}.file-info{font-size:13px!important}.filter-row{align-items:flex-start}.book-title-row>div{min-width:0}@media(max-width:700px){.books{grid-template-columns:1fr}.cover{width:70px;height:100px}.book-head{min-height:0}.book h3{font-size:21px}.book-meta{font-size:12px}.book-meta span:last-child{display:inline}.book-description{font-size:14px}.book-body{padding-top:15px}.start-strip p{font-size:12px}#subjects{gap:3px}#subjects button{font-size:13px}.filter-row{margin-top:16px}}

.brand{font-size:17px;letter-spacing:1px;align-items:center}.brand-text{line-height:1.55}.brand small{font-size:8px;letter-spacing:1px;line-height:2.2}.brand-icon{width:38px;height:45px;flex-shrink:0}.login-story .brand{font-size:21px}.login-story .brand-icon{width:45px;height:52px}.login-card h2{line-height:1.6}

.curriculum-notes{font-size:12px;line-height:1.8;color:var(--muted);margin-top:12px}.curriculum-notes summary{cursor:pointer}.curriculum-notes p{margin:10px 0}

.book{position:relative}.book-open{font:inherit;color:inherit;text-align:left;border:0;background:none;padding:0}.book-open::after{content:"";position:absolute;inset:0;border-radius:9px;cursor:pointer}.book:has(.book-open:focus-visible){outline:3px solid #ab99d5;outline-offset:3px}.book-open:focus-visible{outline:0}.book-source{position:relative;z-index:1;display:block;width:fit-content;max-width:100%;font-size:11px;line-height:1.7;color:#9b8bab;margin:-7px 0 14px;overflow-wrap:anywhere}.book-source[href]:hover{text-decoration:underline;color:#69518c}.book-description{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;flex:none;margin-bottom:14px}.book .tags{margin-top:auto;max-height:96px;overflow:auto;position:relative;pointer-events:none}.tag-thinker{color:#705390;background:#ede7f5}.tag-course{color:#879499;background:#f0f5f5}.detail-tags{margin:16px 0}.course-panel>h2{padding:20px;font-size:19px}.role-teacher .book-source{color:#799789}.role-teacher .book:has(.book-open:focus-visible){outline-color:#7aaca1}

.book .tags{max-height:none;overflow:visible}
.book .book-head{position:static}