:root{font-family:Inter,"Microsoft YaHei",sans-serif;color:#26333f;background:#f6f7f9;font-size:14px}*{box-sizing:border-box}body{margin:0;height:100vh;height:100dvh;display:flex;flex-direction:column}button,input,select{font:inherit}button{cursor:pointer;background:white;border:1px solid #dce2e8;border-radius:7px;padding:8px 12px;color:inherit}button:hover{background:#edf3fa}button:disabled{opacity:.5;cursor:wait}input,select{border:1px solid #dce2e8;border-radius:7px;padding:9px;background:white;min-width:0}header{min-height:64px;display:flex;align-items:center;gap:24px;padding:0 28px;flex-shrink:0;border-bottom:1px solid #e2e7ed;background:white}.brand{font-size:21px;font-weight:750;color:#234567;text-decoration:none}nav{display:flex;gap:4px}nav button{border:0;background:transparent;padding:11px 18px}button.active{background:#e8f0fa;color:#245a94}main{display:grid;grid-template-columns:minmax(0,1fr);flex:1;min-height:0;gap:16px;padding:18px}#library-pane{display:flex;flex-direction:column}#filters{display:flex;gap:8px;align-items:center;margin-left:auto}#search{width:220px}#course{max-width:140px}#year{max-width:110px}.library-layout{display:grid;grid-template-columns:210px minmax(0,1fr);flex:1;min-height:0}#materials{overflow:auto;border-right:1px solid #edf0f3;padding:10px}#materials button{display:block;text-align:left;width:100%;margin-bottom:6px;border:0;padding:12px}small,.meta{display:block;color:#7a8795;font-size:12px;line-height:1.7}#reader{padding:24px;overflow:auto;line-height:1.85}h1{font-size:23px;line-height:1.4;margin:0 0 8px}h2{font-size:18px;margin:16px 0 9px}h3{font-size:15px;margin:20px 0 8px}p{white-space:pre-wrap;overflow-wrap:anywhere}.block-image{display:block;max-width:100%;max-height:300px;object-fit:contain;cursor:zoom-in;margin:14px auto}.equation{overflow:auto;padding:10px 0}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%;font-size:13px}td,th{border:1px solid #dde3ea;padding:8px;text-align:left}th{background:#f2f5f8}.related{border-top:1px solid #e5eaf0;margin-top:26px;padding-top:10px}.chips{display:flex;flex-wrap:wrap;gap:6px}.chip{background:#edf2f7;border-radius:5px;padding:3px 8px;font-size:12px}.related button{margin:3px;font-size:12px}.empty{color:#8995a1;padding:24px 8px;text-align:center}#notice{background:#fff3d6;padding:10px 28px}dialog{border:0;border-radius:10px;max-width:95vw;max-height:95vh}dialog::backdrop{background:#0009}dialog img{display:block;max-width:90vw;max-height:82vh;object-fit:contain}#close-image{float:right;margin-bottom:8px}[hidden]{display:none!important}@media(max-width:1000px){main{grid-template-columns:minmax(0,1fr);padding:10px;gap:10px}.library-layout{grid-template-columns:155px minmax(0,1fr)}#reader{padding:18px}header{padding:0 16px;gap:10px}nav button{padding:10px 12px}}@media(max-width:740px){header{min-height:58px;padding:0 10px;gap:8px}.brand{font-size:17px}nav button{padding:9px 10px}main{display:flex;flex-direction:column;padding:8px}header{flex-wrap:wrap;padding:8px 10px;row-gap:6px}#filters{flex-basis:100%;margin-left:0}#search{flex:1;width:auto}#course,#year{max-width:110px}.library-layout{grid-template-columns:115px minmax(0,1fr)}#materials{padding:4px}#materials button{padding:10px 7px;font-size:12px}#reader{padding:14px}h1{font-size:19px}}button:focus-visible,summary:focus-visible,textarea:focus-visible{outline:2px solid #3f80bc;outline-offset:3px}


main{grid-template-columns:minmax(0,1fr)}#library-pane{width:100%;min-width:0}#reader{min-width:0}
button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid #3f80bc;outline-offset:2px}
#reader{max-width:none}
#reader>*{max-width:900px;margin-left:auto;margin-right:auto}
main{grid-template-rows:minmax(0,1fr)}
#library-pane{min-height:0;overflow:hidden}
#search{min-width:0}
#course,#year{flex:0 1 auto;min-width:0}
@media(max-width:740px){#library-pane{flex:1}#filters{min-width:0}#search{flex:1 1 0}#course,#year{max-width:30%}}

@media(max-width:740px){.library-layout{grid-template-columns:minmax(0,1fr);grid-template-rows:minmax(70px,145px) minmax(0,1fr)}#materials{border-right:0;border-bottom:1px solid #edf0f3;padding:4px;display:flex;gap:6px;align-content:flex-start;flex-wrap:wrap}#materials button{width:auto;flex:1 1 145px;margin-bottom:0;padding:8px 10px}#reader{width:100%;padding:14px}}
#reader .syllabus-tree{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr));gap:8px;margin:16px auto 24px;max-width:900px;max-height:220px;overflow:auto;align-content:start;padding:2px}
.syllabus-chapter{min-width:0;border:1px solid #e1e7ed;border-radius:8px;background:#fff}
.syllabus-chapter>summary{cursor:pointer;padding:9px 12px;font-weight:650;color:#315675;overflow-wrap:anywhere}
.syllabus-sections{display:grid;gap:4px;padding:0 8px 8px}
#reader .syllabus-section{display:block;width:100%;text-align:left;font-size:12px;line-height:1.45;padding:7px 9px;overflow-wrap:anywhere}
#reader .syllabus-section.active{background:#e8f0fa;color:#245a94}
@media(max-width:740px){#reader .syllabus-tree{max-height:160px;grid-template-columns:minmax(0,1fr)}}