header .brand{color:var(--text)}.backlink{border:1px solid var(--line);padding:8px 14px;border-radius:8px;font-size:14px}.examShell{max-width:1400px;margin:auto;display:grid;grid-template-columns:280px minmax(0,1fr);min-height:calc(100dvh - 94px)}.topicNav{padding:30px 24px;border-right:1px solid var(--line);background:#101b26}.topicNav h2{font-size:21px;margin:8px 0 22px}.searchLabel{display:block;font-size:12px;color:var(--muted);margin-bottom:7px}#search{width:100%;padding:10px 12px;border:1px solid #344959;border-radius:7px;background:#0c1722;color:var(--text);font:inherit;font-size:14px}#topicList{display:block;margin-top:22px}#topicList h3{font-size:12px;color:var(--muted);margin:22px 10px 8px;font-weight:400}#topicList a{display:block;padding:8px 12px;margin:3px 0;color:#c4d2dc;border-radius:6px;font-size:14px}#topicList a.active{background:#203d42;color:var(--accent);box-shadow:inset 2px 0 var(--accent)}#topicList a:hover{background:#223442}.scope{font-size:12px;color:var(--muted);line-height:1.9;margin-top:30px}#topic{padding:44px 5%;max-width:1080px;width:100%;min-width:0}#topic h1{font-size:34px;letter-spacing:0;font-weight:600;margin-top:12px}.topicEnglish{color:var(--muted);font-size:14px;margin-top:3px}.intro{font-size:18px;line-height:1.8;color:#c5d5df;margin:23px 0}.topicTop{display:flex;align-items:center;gap:10px;font-size:12px;color:var(--muted)}.knowledge{display:grid;grid-template-columns:1fr 1fr;gap:18px}.card{padding:23px;background:#14212e;border:1px solid #2b3e4e;border-radius:12px;min-width:0}.card h2{font-size:16px;font-weight:500;margin:0 0 16px;color:#dceaf1}.card p{font-size:15px;line-height:1.9;margin:0;color:#bdcdd9}.boundary{grid-column:1/-1}.boundaryLayout{display:grid;grid-template-columns:1fr;gap:20px}.boundaryLayout.hasDiagram{grid-template-columns:1fr 240px}table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;vertical-align:top;padding:12px 0;border-bottom:1px solid #2b3e4e}th{width:90px;color:var(--accent);font-weight:500;padding-right:12px}td{color:#d2dce4;line-height:1.8}tr:last-child th,tr:last-child td{border:0}.diagram{background:#0e1b27;border-radius:9px;align-self:center;padding:15px;text-align:center}.diagram svg{width:100%;height:auto;display:block}.diagram small{font-size:11px;color:var(--muted)}.definition{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 14px}.definition button{font-size:13px;padding:6px 10px}.memory{grid-column:1/-1;border-left:3px solid var(--accent)}.memory p{color:var(--accent);font-size:17px}.pitfall{border-color:#766144}.pitfall h2{color:#ebc693}.modelLink{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:25px;padding:24px;background:#183436;border:1px solid #3d6968;border-radius:12px}.modelLink h2{font-size:18px;margin:0 0 8px}.modelLink p{font-size:13px;color:#abc8c7;line-height:1.8;margin:0}.modelLink a{white-space:nowrap;padding:11px 16px;background:var(--accent);color:#0e302e;border-radius:7px;font-size:14px;font-weight:600}.references{font-size:12px;color:var(--muted);margin-top:28px;line-height:2}.references a{display:inline-block;margin-right:18px;text-decoration:underline;text-underline-offset:3px}.nextTopics{display:flex;justify-content:space-between;gap:15px;margin-top:30px;padding-top:20px;border-top:1px solid var(--line);font-size:14px}@media(max-width:900px){.examShell{grid-template-columns:230px minmax(0,1fr)}.topicNav{padding:24px 16px}#topic{padding:30px 24px}.knowledge{grid-template-columns:1fr}.boundaryLayout.hasDiagram{grid-template-columns:1fr}.diagram{max-width:250px;width:100%;justify-self:center}.modelLink{align-items:start;flex-direction:column}}@media(max-width:600px){.examShell{display:block}.topicNav{border-right:0;border-bottom:1px solid var(--line);padding:18px}.topicNav h2{margin:5px 0 12px}.topicNav .scope{margin:12px 0 0}#topicList{display:flex;overflow:auto;gap:6px;margin-top:12px;padding-bottom:5px}#topicList h3{display:none}#topicList a{white-space:nowrap;border:1px solid var(--line);margin:0}#topic{padding:28px 18px}#topic h1{font-size:29px}.intro{font-size:16px}.card{padding:18px}.knowledge{gap:13px}.backlink{font-size:12px;padding:7px 10px}.nextTopics{font-size:12px}}
/* Reading and navigation refinements */
.categoryTabs{display:flex;gap:5px;margin:0 0 18px;flex-wrap:wrap}.categoryTabs button{padding:6px 8px;font-size:12px;min-height:36px}.topicDirectory summary{font-size:13px;color:var(--muted);cursor:pointer;display:flex;justify-content:space-between;padding:16px 0 0}.topicDirectory summary::before{content:'⌄';margin-right:6px}.topicDirectory summary span{margin-left:auto}.topicDirectory:not([open]) #topicList{display:none}.noResults{font-size:13px;color:var(--muted)}.articleHeading{display:flex;align-items:center;justify-content:space-between;gap:20px}.primaryLink{display:inline-block;white-space:nowrap;border-radius:8px;background:var(--accent);color:#0c302c;font-size:14px;font-weight:600;padding:10px 16px}.recall{border-left:3px solid var(--accent);padding:13px 20px;background:#153033;border-radius:0 9px 9px 0;margin:0 0 23px}.recall span{font-size:11px;letter-spacing:1px;color:#a0c8c7}.recall p{font-size:16px;color:#c8ede5;margin:4px 0;line-height:1.8}.knowledge .pitfall{grid-column:1/-1}.relatedTopics{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:22px;font-size:13px}.relatedTopics>span{color:var(--muted)}.relatedTopics a{padding:5px 9px;background:#1d2d3b;border-radius:5px}.references summary{cursor:pointer}.references a{margin-top:8px}.nextTopics{flex-wrap:wrap;align-items:center}.nextTopics button{font-size:12px;padding:5px 9px}.modelLink p+p{margin-top:8px}#topic:focus{outline:none}.topicNav{position:sticky;top:0;height:100dvh;overflow-y:auto;scrollbar-width:thin}#topicList{margin-top:5px}.topicTop{flex-wrap:wrap}@media(min-width:901px){.examShell{grid-template-columns:285px minmax(0,1fr)}#topic{padding:36px 5%}.topicNav{padding-top:28px}.card{padding:21px}.intro{margin:18px 0}.topicEnglish{font-size:13px}}@media(max-width:600px){.topicNav{position:static;height:auto;overflow:visible}.topicNav .eyebrow,.topicNav .scope{display:none}.topicNav h2{font-size:18px}.categoryTabs{margin-bottom:12px}.categoryTabs button{flex:1;min-height:40px}.topicDirectory summary{padding-top:12px}#topicList{display:block;max-height:230px;overflow:auto;padding-top:5px}#topicList h3{display:block;margin:12px 8px 3px}#topicList a{display:block;white-space:normal;border:0;padding:9px 12px;min-height:42px}.articleHeading{align-items:start;gap:10px}#topic h1{font-size:26px;margin-top:10px}.primaryLink{padding:9px 10px;font-size:12px;margin-top:13px}.recall{padding:12px 15px}.recall p{font-size:15px}.card th{width:78px}.topicTop{font-size:11px}.nextTopics{gap:14px}.definition button{min-height:42px}.backlink{min-height:40px;display:flex;align-items:center}}