:root{--bg:#f7f9fc;--panel:#fff;--ink:#172534;--muted:#627386;--line:#e2e8ef;--accent:#315f9f;--soft:#edf3fc;--shadow:0 4px 18px #233f5e05;color-scheme:light}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.55 -apple-system,BlinkMacSystemFont,'PingFang SC',sans-serif}body[data-skill=listening]{--accent:#33735b;--soft:#eaf4ef}html[data-theme="dark"] body{--bg:#141b23;--panel:#1c2631;--ink:#e6edf5;--muted:#abb9c9;--line:#344250;--accent:#97b9ef;--soft:#26394e;color-scheme:dark}html[data-theme="dark"] body[data-skill=listening]{--accent:#91c9ac;--soft:#253f35}button,input,select{font:inherit}button{cursor:pointer;border:1px solid var(--line);border-radius:7px;padding:8px 12px;background:var(--panel);color:var(--ink);transition:background .16s,border-color 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var(--line);border-radius:11px;padding:20px 22px;display:grid;grid-template-columns:minmax(0,1fr) 175px;gap:24px;box-shadow:var(--shadow)}.material:hover{border-color:var(--accent)}.overline{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:11px;margin-bottom:9px}.pill{background:var(--soft);color:var(--accent);border-radius:4px;padding:2px 7px}.material h2{font:600 21px/1.35 Georgia,'Noto Serif SC',serif;letter-spacing:-.25px;overflow-wrap:anywhere;margin:0 0 6px}.cn{font-size:12px;color:var(--muted);margin:0 0 12px;overflow-wrap:anywhere}.tags{display:flex;gap:7px;flex-wrap:wrap;align-items:center;font-size:11px;color:var(--muted);margin-top:12px}.tag{background:var(--soft);color:var(--accent);padding:3px 7px;border-radius:4px}.row-actions{display:flex;flex-direction:column;justify-content:center;gap:10px;min-width:0}.state{font-size:11px;color:var(--muted)}.state 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/* Keep the specimen toolbar from consuming the material viewport. */
@media(min-width:701px){header{height:46px}.heading{padding:16px 0}.heading .caption{font-size:10px;margin-bottom:4px}h1{font-size:25px}.source{margin-bottom:12px}.lab{padding:8px 12px;margin-bottom:12px}.results-head{margin:12px 0 9px}.material{padding:15px 20px}.overline{margin-bottom:6px}.cn{margin-bottom:6px}.tags{margin-top:8px}.material h2{font-size:20px}}
body[data-skill=writing]{--accent:#92613b;--soft:#f7eee5}html[data-theme="dark"] body[data-skill=writing]{--accent:#dbb18b;--soft:#423226}.cards{grid-template-columns:repeat(3,minmax(0,1fr))}
#materials{grid-template-columns:repeat(3,minmax(0,1fr))}
#materials.cards{grid-template-columns:repeat(3,minmax(0,1fr))}.cards .material{min-height:250px}.cards .row-actions{flex-direction:column;align-items:stretch}.cards .buttons{width:100%}.cards h2{font-size:21px;line-height:1.4}.cards .content{min-width:0}.cards .tags{margin-bottom:8px}.chart-preview{border:1px solid var(--line);padding:10px;background:#fff;width:100%;margin:14px 0 8px;position:relative}.chart-preview img{width:100%;height:155px;object-fit:contain;display:block}.chart-preview span{display:block;font-size:11px;color:#687481;margin-top:6px}.prompt{font:16px/1.7 Georgia,serif;white-space:pre-line;overflow-wrap:anywhere;margin:12px 0;color:var(--ink)}.usage{font-size:12px;color:var(--muted);border-top:1px solid var(--line);padding-top:12px;margin-top:14px}.usage strong{color:var(--accent);font-weight:500;display:block;margin-bottom:4px}.writing-title{font:600 17px/1.5 -apple-system,sans-serif!important}.corpus-title{font:500 21px/1.55 Georgia,serif!important}#bookgrid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.book{padding:22px;text-align:left;min-height:130px;background:var(--panel)}.book strong{font:25px Georgia,serif;display:block;margin:9px 0}.book small{color:var(--muted);font-size:11px}.book-mark{font-size:11px;color:var(--accent);letter-spacing:2px}#catalogNav{display:flex;align-items:center;gap:14px;margin:10px 0 18px;font-size:13px}#catalogNav:empty{display:none}#pagination{display:flex;justify-content:center;gap:14px;align-items:center;margin:28px 0;font-size:12px;color:var(--muted)}button:disabled{opacity:.4;cursor:default}.empty{grid-column:1/-1}#chartDialog{max-width:1000px;width:calc(100% - 36px);max-height:90vh;overflow:auto}#chartFull{display:block;width:100%;max-height:70vh;object-fit:contain;background:white;margin-top:12px}.source span{font-size:11px}.source{flex-wrap:wrap}.source button{min-width:90px}.source span{flex:1;text-align:right}#materials[hidden],#bookgrid[hidden]{display:none}.state{min-height:20px}.primary{min-height:38px}@media(max-width:1100px){#materials.cards{grid-template-columns:repeat(2,minmax(0,1fr))}#bookgrid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(max-width:700px){#materials.cards{grid-template-columns:1fr}#bookgrid{grid-template-columns:repeat(2,minmax(0,1fr))}.source span{flex-basis:100%;text-align:left}.sidebar{gap:8px}.source button{min-width:80px}#testgrid{grid-template-columns:repeat(2,minmax(0,1fr))}.cards .material{min-height:0}.heading p:not(.caption){font-size:12px}.filters label{font-size:11px}.cards .row-actions{flex-direction:row;align-items:center}.cards .buttons{width:auto;flex:1}.cards .state{flex:1}.chart-preview img{height:190px}}

/* Bilingual study centre. These tokens never load in the source exam apps. */
:root{--font-editorial:'Iowan Old Style','Baskerville','Palatino Linotype',Georgia,serif;--font-ui:'Avenir Next','Segoe UI','PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif}
body{font-family:var(--font-ui);font-weight:400;font-kerning:normal;font-optical-sizing:auto}
h1{font:400 34px/1.2 var(--font-editorial);letter-spacing:-.025em}.heading p:not(.caption){font-size:12px;letter-spacing:.025em;margin-top:8px}.heading{padding:22px 0}.heading .caption{font-size:9px;letter-spacing:.16em;margin-bottom:7px}
.sidebar nav button{display:flex;align-items:baseline;gap:10px;padding:10px 12px}.sidebar nav span{font:400 21px/1.3 var(--font-editorial);margin:0}.sidebar nav small{font-size:11px;font-weight:400;color:var(--muted)}.caption{font-size:9px;letter-spacing:.14em}.side-note{font-size:12px;line-height:2}.logo{font-weight:500}.logo>span{font-family:var(--font-editorial);font-size:18px}.source button{font-size:12px;font-weight:500;min-height:38px}.source span{font-size:10px}
.cards .material h2{font-family:var(--font-editorial);font-size:23px;line-height:1.3;font-weight:400;letter-spacing:-.015em;text-wrap:pretty;overflow-wrap:break-word}.cards .material .writing-title{font:500 15px/1.6 var(--font-ui)!important;letter-spacing:.02em}.cards .material .corpus-title{font:400 23px/1.45 var(--font-editorial)!important}.prompt{font:400 17px/1.7 var(--font-editorial)}.cn{font-size:12px;line-height:1.8;margin-top:9px}.overline{font-size:10px;letter-spacing:.02em;margin-bottom:12px}.tags{font-size:10px}.primary{font-weight:500;font-size:12px}.book strong,.test strong{font-family:var(--font-editorial);font-weight:400}.book-mark{font-size:9px;letter-spacing:.13em}.book strong{font-size:27px}.test strong{font-size:23px}#catalogNav strong{font-weight:500}button{touch-action:manipulation}button:active:not(:disabled){transform:scale(.98)}.bookmark{min-width:38px}.state{font-size:10px}.preview-link{padding:0;border:0;color:var(--accent);background:none;border-radius:0;font-size:11px;text-align:left;min-height:30px}#sampleOnly[aria-pressed=true]{color:var(--accent);background:var(--soft);border-color:var(--accent)}
#sampleDialog{max-width:800px;max-height:88vh;overflow:auto;padding:28px 34px}.sample-top{display:flex;align-items:center;justify-content:space-between;gap:12px}.sample-top .caption{margin:0}#sampleTitle{font:400 32px/1.2 var(--font-editorial);letter-spacing:-.02em}#sampleMeta{font-size:12px}#sampleBody{border-top:1px solid var(--line);margin-top:22px;padding-top:16px}#sampleBody p{font:400 19px/1.8 var(--font-editorial);white-space:pre-line;color:var(--ink)}#sampleBody audio{width:100%;margin:10px 0}#sampleBody img{width:100%;max-height:350px;object-fit:contain;background:white}#sampleDialog details{font-size:11px;color:var(--muted);border-top:1px solid var(--line);padding-top:18px}#sampleProvenance{white-space:pre-wrap;overflow-wrap:anywhere;font-size:10px}summary{cursor:pointer}
@media(max-width:700px){.sidebar nav button{padding:7px 6px;gap:0;flex-direction:column;align-items:center}.sidebar nav span{display:block;font-size:15px}.sidebar nav small{display:block;font-size:10px}.sidebar{gap:8px}.side-bottom button{font-size:10px;white-space:nowrap}.heading{padding:20px 0}h1{font-size:29px}#subject-icon{padding-right:0;font-size:30px}.source button{min-width:0;padding:8px 10px;font-size:11px}.cards .row-actions{flex-direction:column;align-items:stretch}.cards .buttons{width:100%}#sampleDialog{padding:20px}#sampleTitle{font-size:27px}#sampleBody p{font-size:17px}}
@media(prefers-reduced-motion:reduce){button:active:not(:disabled){transform:none}}