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@media(max-width:650px){.page-width{padding-left:21px;padding-right:21px}.site-header{height:auto}.header-inner{padding:19px 21px 0;flex-wrap:wrap;gap:15px}.brand{font-size:20px}.brand svg{width:32px;height:32px}.brand small{font-size:8px}.header-brief{margin-left:auto;font-size:10px}.header-brief span{margin-left:5px}nav{order:3;width:100%;gap:28px;height:auto}nav a{padding:9px 0 14px;font-size:12px}nav a.active:after{bottom:4px}.hero{grid-template-columns:1fr;gap:30px;padding-top:34px;padding-bottom:33px}.hero h1{font-size:42px;margin:20px 0;letter-spacing:-1.5px}.hero .eyebrow{font-size:10px}.hero-sub{font-size:14px}.hero-actions{margin-top:22px}.hero-numbers{margin-top:26px;gap:32px}.hero-numbers div{display:flex;gap:8px;align-items:baseline}.hero-numbers span{font-size:10px}.feature{display:grid;grid-template-columns:1fr 1.2fr;position:relative}.feature-top{grid-column:1/-1;padding:13px 17px}.atom-illustration{height:190px;align-self:center;overflow:hidden}.atom-illustration svg{width:310px;height:190px;max-width:none;position:absolute;left:50%;transform:translateX(-50%)}.illustration-note{right:10px;bottom:8px;font-size:8px}.feature-body{padding:10px 17px 19px;position:relative}.feature h2{font-size:23px;margin:11px 0 8px}.feature p{font-size:10px;line-height:1.8;margin-bottom:12px}.badge{font-size:9px}.feature-date{font-size:9px;margin-top:10px}.feature-link{font-size:11px}.feature-link span{margin-left:13px}.edition-strip{gap:13px;align-items:start;flex-wrap:wrap;padding-top:14px;padding-bottom:14px}.edition-strip p{font-size:11px;flex-basis:calc(100% - 75px)}.edition-strip button{font-size:10px;margin-left:auto;padding:0}.section-heading{align-items:start;margin-bottom:20px}.section-heading h2{font-size:25px}.section-heading>p{display:none}.research-section{padding-top:35px}.toolbar{flex-wrap:wrap;gap:15px}.filters{gap:3px}.filters button{font-size:11px;padding:7px 12px}.search-box{width:100%;min-width:0}.search-box input{font-size:12px}.result-tools{flex-wrap:wrap;padding-top:12px;padding-bottom:17px}.result-tools>div{gap:12px}.select-label,.select-label select{font-size:9px}.entry-grid{grid-template-columns:1fr;gap:13px}.entry-card{padding:20px;min-height:0}.entry-title{font-size:22px;margin-top:14px}.entry-short{font-size:12px;margin-bottom:13px}.entry-delta{margin-bottom:15px;font-size:11px}.entry-bottom{padding-top:11px}.map-teaser{grid-template-columns:1fr;gap:28px;padding-top:34px;padding-bottom:30px;margin-top:37px}.map-teaser h2{font-size:26px;margin-top:14px}.map-teaser p{font-size:12px}.question-preview button{font-size:14px;padding-top:18px;padding-bottom:18px}.question-preview b{top:31px}.site-footer{flex-wrap:wrap;padding-top:25px;padding-bottom:25px;gap:15px;margin-top:18px}.site-footer p{flex-basis:calc(100% - 150px);font-size:10px}.site-footer>a:not(.footer-brand){font-size:10px}.secondary-view{padding-top:35px;padding-bottom:30px}.secondary-view>h1,.brief-header h1{font-size:34px;margin-top:12px}.view-intro{font-size:12px;margin-bottom:27px}.topic-map{grid-template-columns:1fr;gap:20px}.topic-column-head{padding:19px 21px}.topic-column-head h2{font-size:24px}.topic-row{padding:17px 44px 17px 21px}.topic-question{font-size:17px}.saved-topics{grid-template-columns:1fr}.saved-heading{font-size:22px}.brief-header{flex-wrap:wrap;gap:4px;margin-bottom:22px}.brief-header .primary-button{font-size:11px;padding:9px 14px}.brief-lead{padding:23px}.brief-lead li{font-size:12px}.brief-item{grid-template-columns:28px 1fr;gap:13px;padding:21px 0}.brief-index{font-size:24px}.brief-item h2{font-size:20px}.brief-item>div:last-child{grid-column:2;display:flex;align-items:center;justify-content:space-between;text-align:left;padding-top:0}.brief-item>div:last-child button{margin:0;font-size:10px}.method-grid{grid-template-columns:1fr;gap:15px}.method-grid article{padding:23px}.method-grid h2{font-size:21px}.method-grid p,.scope-note p{font-size:12px}.dialog-shell{padding:50px 23px 27px}dialog{width:calc(100% - 20px);max-height:92vh}#detail-title{font-size:27px}.detail-intro{font-size:13px}.detail-step{grid-template-columns:1fr;gap:6px;padding:14px 0}.detail-step h3{font-size:10px}.detail-step p{font-size:12px}.detail-actions{flex-wrap:wrap}.toast{font-size:11px;bottom:17px;white-space:normal}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}
@media print{body{background:white;font-size:12px}.site-header,.site-footer,.toast,dialog,.brief-header button{display:none!important}.view{display:none!important}#brief-view{display:block!important;padding:0;max-width:none}.brief-header h1{font-size:27px}.brief-lead{background:transparent;border:1px solid #bbb;padding:16px}.brief-item{break-inside:avoid;grid-template-columns:30px 1fr 100px}.brief-item h2{font-size:17px}.brief-item button{display:none!important}.brief-item p{font-size:11px}.brief-end{margin-top:20px}.print-source{display:block!important;overflow-wrap:anywhere;font-size:8px;color:#555}.page-width{padding-left:0;padding-right:0}@page{margin:16mm}}
.print-source{display:none}.entry-card h3{margin:0}.saved-heading small{font:12px var(--sans);color:var(--muted)}

/* Expanded academic atlas: disciplines, AI research records and source catalogues */
:root{
  --physics:#536448;--physics-pale:#edf0e8;
  --chemistry:#8a553c;--chemistry-pale:#f4ece7;
  --life:#3f7057;--life-pale:#e9f1ec;
  --medicine:#8c4e58;--medicine-pale:#f4e9eb;
  --earth:#536a7a;--earth-pale:#eaf0f3;
  --engineering:#5c6178;--engineering-pale:#ececf2;
  --humanities:#7a5d6b;--humanities-pale:#f1ebee;
  --math-pale:#f4f0e6;--computer-pale:#eaf1f0;
  --blueprint:#293b43;--blueprint-muted:#64747a
}

/* Keep the wider navigation usable as the information architecture grows. */
.site-header{position:relative;z-index:20}
.header-inner nav{min-width:0}
.domain-filter-scroll{overflow-x:auto;scrollbar-width:thin;scrollbar-color:#c8c9bf transparent;padding-bottom:3px}
.domain-filter-scroll::-webkit-scrollbar{height:4px}.domain-filter-scroll::-webkit-scrollbar-thumb{background:#c8c9bf}

/* Opening feature: an editorial data graphic, not a promotional banner. */
.feature-math{height:218px;position:relative;display:grid;grid-template-columns:1.35fr 1fr;align-items:end;padding:27px 28px 25px;border-top:1px solid #d8ddca;border-bottom:1px solid #d8ddca;background-color:#e4e8d8;background-image:linear-gradient(#cdd5c522 1px,transparent 1px),linear-gradient(90deg,#cdd5c522 1px,transparent 1px);background-size:24px 24px;overflow:hidden}
.feature-math:before{content:"";position:absolute;width:270px;height:270px;border:1px solid #aab59a;border-radius:50%;left:-70px;top:18px;box-shadow:0 0 0 34px #aab59a19,0 0 0 68px #aab59a10}
.feature-math:after{content:"FORMAL CHECK  /  REPOSITORY HISTORY";position:absolute;right:25px;top:20px;color:#7b866d;font:9px/1.2 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:1.1px}
.feature-math span{position:relative;z-index:1;font:400 clamp(58px,6.2vw,82px)/.8 Georgia,serif;letter-spacing:-4px;color:#4f5f43}
.feature-math i{position:absolute;z-index:1;left:30px;bottom:13px;font:normal 8px/1 var(--sans);letter-spacing:1.7px;color:#718064}
.feature-math b{position:relative;z-index:1;justify-self:end;text-align:right;color:#737d68;font:400 36px/1 Georgia,serif;padding:0 0 8px 18px;border-left:1px solid #bdc5b2}
.feature-math b small{font:500 9px/1.4 var(--sans);letter-spacing:1px}

/* Nine-discipline index. */
.discipline-section{padding-top:62px;padding-bottom:64px;border-bottom:1px solid var(--line)}
.discipline-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--line);border-left:1px solid var(--line);background:var(--white)}
.discipline-card{--domain-color:var(--olive);--domain-pale:#eef0e9;min-height:156px;position:relative;display:flex;flex-direction:column;align-items:flex-start;text-align:left;padding:22px 24px 20px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:linear-gradient(180deg,var(--domain-pale) 0 4px,var(--white) 4px 100%);transition:background-color .16s,border-color .16s}
.discipline-card:hover{background:linear-gradient(180deg,var(--domain-color) 0 4px,var(--domain-pale) 4px 100%)}
.discipline-card:after{content:"↗";position:absolute;right:21px;bottom:18px;color:var(--domain-color);font-size:13px}
.discipline-card .discipline-en{font-size:9px;line-height:1.4;letter-spacing:1.5px;color:var(--domain-color);text-transform:uppercase}
.discipline-card h3{font:500 21px/1.5 var(--serif);margin:11px 0 5px}
.discipline-card p{font-size:11px;line-height:1.75;color:var(--muted);margin:0 30px 0 0}
.discipline-card strong,.discipline-card .discipline-count{margin-top:auto;padding-top:17px;color:var(--domain-color);font:400 11px/1.2 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:.5px}

/* Shared discipline colors across cards, maps, filters and detail sheets. */
.discipline-card.math{--domain-color:var(--math);--domain-pale:var(--math-pale)}
.discipline-card.physics{--domain-color:var(--physics);--domain-pale:var(--physics-pale)}
.discipline-card.computer{--domain-color:var(--computer);--domain-pale:var(--computer-pale)}
.discipline-card.chemistry{--domain-color:var(--chemistry);--domain-pale:var(--chemistry-pale)}
.discipline-card.life{--domain-color:var(--life);--domain-pale:var(--life-pale)}
.discipline-card.medicine{--domain-color:var(--medicine);--domain-pale:var(--medicine-pale)}
.discipline-card.earth{--domain-color:var(--earth);--domain-pale:var(--earth-pale)}
.discipline-card.engineering{--domain-color:var(--engineering);--domain-pale:var(--engineering-pale)}
.discipline-card.humanities{--domain-color:var(--humanities);--domain-pale:var(--humanities-pale)}
.domain-name.physics{color:var(--physics)}.domain-name.chemistry{color:var(--chemistry)}.domain-name.life{color:var(--life)}.domain-name.medicine{color:var(--medicine)}.domain-name.earth{color:var(--earth)}.domain-name.engineering{color:var(--engineering)}.domain-name.humanities{color:var(--humanities)}
.badge.physics{color:var(--physics);background:var(--physics-pale);border-color:#d5ddce}.badge.chemistry{color:var(--chemistry);background:var(--chemistry-pale);border-color:#e7d4ca}.badge.life{color:var(--life);background:var(--life-pale);border-color:#cce0d4}.badge.medicine{color:var(--medicine);background:var(--medicine-pale);border-color:#e3cdd2}.badge.earth{color:var(--earth);background:var(--earth-pale);border-color:#cedbe1}.badge.engineering{color:var(--engineering);background:var(--engineering-pale);border-color:#d6d6e1}.badge.humanities{color:var(--humanities);background:var(--humanities-pale);border-color:#ddd0d7}
.entry-delta.physics{border-color:#d5ddce;color:#627157}.entry-delta.chemistry{border-color:#ead3c6;color:#865e4a}.entry-delta.life{border-color:#cfe0d6;color:#507661}.entry-delta.medicine{border-color:#e5ccd1;color:#875b64}.entry-delta.earth{border-color:#cddce3;color:#5c7481}.entry-delta.engineering{border-color:#d6d5e2;color:#666b82}.entry-delta.humanities{border-color:#dfd0d8;color:#79636e}
.topic-column-head.physics{background:var(--physics-pale)}.topic-column-head.chemistry{background:var(--chemistry-pale)}.topic-column-head.life{background:var(--life-pale)}.topic-column-head.medicine{background:var(--medicine-pale)}.topic-column-head.earth{background:var(--earth-pale)}.topic-column-head.engineering{background:var(--engineering-pale)}.topic-column-head.humanities{background:var(--humanities-pale)}

/* Homepage AI introduction. */
.ai-home{display:grid;grid-template-columns:minmax(260px,.72fr) minmax(0,1.28fr);gap:58px;align-items:start;padding-top:65px;padding-bottom:65px;border-bottom:1px solid var(--line)}
.ai-home>div:first-child{position:sticky;top:28px}
.ai-home h2{font:500 31px/1.48 var(--serif);letter-spacing:-.5px;margin:14px 0}
.ai-home>div:first-child>p{max-width:390px;margin:0 0 25px;color:var(--muted);font-size:12px;line-height:1.95}
.ai-home-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}
.ai-home-card{position:relative;min-height:205px;padding:21px 22px 19px;border:1px solid var(--line);background:var(--white);display:flex;flex-direction:column;text-align:left;transition:border-color .16s,transform .16s}
.ai-home-card:hover{border-color:#aeb6a8;transform:translateY(-2px)}
.ai-home-card>span:first-child,.ai-home-card .ai-home-meta{color:var(--muted);font-size:9px;letter-spacing:1px;text-transform:uppercase}
.ai-home-card h3{font:500 18px/1.55 var(--serif);margin:13px 0 8px}
.ai-home-card p{margin:0;color:var(--muted);font-size:11px;line-height:1.8}
.ai-home-card b,.ai-home-card strong{font-size:10px;font-weight:500;color:var(--olive);margin-top:auto;padding-top:17px}
.ai-home-card:after{content:"↗";position:absolute;right:20px;bottom:17px;color:var(--accent);font-size:12px}

/* AI research database page. */
.ai-view{max-width:1240px}
.ai-page-head{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:70px;align-items:end;padding-bottom:38px;border-bottom:1px solid var(--line)}
.ai-page-head h1{font:500 clamp(37px,4vw,49px)/1.45 var(--serif);letter-spacing:-1px;margin:15px 0 17px}
.ai-page-head .view-intro{margin-bottom:0;max-width:750px}
.ai-principle{border-top:2px solid var(--blueprint);padding:17px 19px 18px;background:#eef0ec;display:grid;gap:8px}
.ai-principle strong{font-size:10px;letter-spacing:1.4px;color:var(--blueprint);margin-bottom:4px}
.ai-principle span{position:relative;padding-left:15px;font-size:10px;color:#626c67;line-height:1.6}
.ai-principle span:before{content:"";position:absolute;left:0;top:.62em;width:5px;height:1px;background:var(--accent)}
.ai-stats{display:grid;grid-template-columns:repeat(4,1fr);margin:27px 0 58px;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.ai-stat{padding:18px 20px 17px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--white);min-height:89px}
.ai-stat strong{display:block;font:400 27px/1.2 Georgia,serif;margin-bottom:5px;color:var(--blueprint)}
.ai-stat span{display:block;font-size:9px;line-height:1.5;letter-spacing:.7px;color:var(--muted)}
.ai-advances{padding-bottom:65px}
.ai-toolbar{display:grid;grid-template-columns:155px 180px 190px minmax(230px,1fr);gap:10px;padding:14px;background:#ecece5;border:1px solid var(--line)}
.ai-toolbar label{display:grid;grid-template-rows:auto 1fr;gap:5px;font-size:9px;color:var(--muted);letter-spacing:.5px}
.ai-toolbar select,.ai-toolbar input{width:100%;height:36px;border:1px solid #d4d4ca;border-radius:0;background:var(--white);color:var(--ink);padding:7px 9px;font-size:11px;outline:0}
.ai-toolbar select:focus,.ai-toolbar input:focus{border-color:var(--accent)}
.ai-year-section{margin-top:36px}
.ai-year-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding-bottom:10px;margin-bottom:15px;border-bottom:1px solid #bbbdb2}
.ai-year-head h3,.ai-year-head strong{font:400 29px/1 Georgia,serif;margin:0;color:var(--blueprint)}
.ai-year-head span{font-size:9px;color:var(--muted);letter-spacing:1px}
.ai-card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.ai-card{--domain-color:var(--olive);position:relative;border:1px solid var(--line);border-top:3px solid var(--domain-color);background:var(--white);padding:20px 21px 17px;display:flex;flex-direction:column;min-height:340px;transition:border-color .16s,transform .16s}
.ai-card:hover{border-color:#b8baaf;border-top-color:var(--domain-color);transform:translateY(-2px)}
.ai-card.math{--domain-color:var(--math)}.ai-card.physics{--domain-color:var(--physics)}.ai-card.computer{--domain-color:var(--computer)}.ai-card.chemistry{--domain-color:var(--chemistry)}.ai-card.life{--domain-color:var(--life)}.ai-card.medicine{--domain-color:var(--medicine)}.ai-card.earth{--domain-color:var(--earth)}.ai-card.engineering{--domain-color:var(--engineering)}.ai-card.humanities{--domain-color:var(--humanities)}
.ai-card-top{display:flex;align-items:center;flex-wrap:wrap;gap:6px;padding-right:26px}
.actor-chip,.evidence-chip,.paper-status{display:inline-flex;align-items:center;min-height:21px;padding:3px 7px;border:1px solid var(--line);color:var(--muted);background:#f7f7f3;font-size:9px;line-height:1.35}
.actor-chip.company{color:#586778;background:#edf1f4;border-color:#d3dde3}.actor-chip.academic{color:#536d55;background:#edf2ec;border-color:#d4dfd3}.actor-chip.joint{color:#775f3e;background:#f3eee5;border-color:#e0d4c2}
.evidence-chip{color:var(--domain-color);border-color:color-mix(in srgb,var(--domain-color) 25%,var(--line));background:color-mix(in srgb,var(--domain-color) 7%,white)}
.ai-card h3{font:500 21px/1.5 var(--serif);letter-spacing:-.15px;margin:15px 0 9px}
.ai-card>p{font-size:11px;line-height:1.8;color:var(--muted);margin:0 0 10px}
.ai-problem{padding:11px 12px;margin:5px 0 11px;background:#f2f2ec;border-left:2px solid var(--domain-color);font-size:11px;line-height:1.75;color:#555e57}
.ai-problem strong{font-weight:550;color:var(--ink)}
.ai-card-foot{display:flex;align-items:end;justify-content:space-between;gap:15px;margin-top:auto;padding-top:13px;border-top:1px solid #ecece6;color:var(--muted);font-size:9px;line-height:1.6}
.ai-card-foot button,.ai-card-foot a{color:var(--ink);font-size:10px;white-space:nowrap}.ai-card-foot button:hover,.ai-card-foot a:hover{color:var(--accent)}

/* OpenAI mathematics catalogue: dense but legible, designed for checking. */
.math-catalog{padding:61px 0 66px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.math-catalog-head{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:50px;align-items:end}
.math-catalog-head h2{font:500 31px/1.5 var(--serif);margin:10px 0 11px;letter-spacing:-.4px}
.math-catalog-head p{font-size:12px;line-height:1.9;color:var(--muted);max-width:780px;margin:0}.math-catalog-head p strong{font:400 18px Georgia,serif;color:var(--ink);padding:0 3px}
.math-status-legend{display:grid;gap:10px;padding:16px 18px;border:1px solid var(--line);background:var(--white);font-size:10px;color:var(--muted)}
.math-status-legend span{display:flex;align-items:center;gap:9px}.status-dot{width:7px;height:7px;border-radius:50%;display:inline-block;flex:0 0 auto}.status-dot.lean{background:#4e765d}.status-dot.review{border:1px solid #927047;background:#f6efe2}
.catalog-warning{display:grid;grid-template-columns:235px minmax(0,1fr) auto;gap:20px;align-items:center;margin:25px 0;padding:17px 18px;border:1px solid #dfd4be;background:#f5f0e5;color:#6c604c}
.catalog-warning strong{font:500 14px/1.6 var(--serif);color:#5f523e}.catalog-warning span{font-size:10px;line-height:1.8}.catalog-warning a{font-size:10px;white-space:nowrap;text-decoration:underline;text-underline-offset:3px}
.math-toolbar{display:grid;grid-template-columns:minmax(260px,1fr) auto;align-items:center;gap:15px;margin-top:22px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.math-toolbar .search-box{width:100%;max-width:510px}
.math-catalog-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px;margin-top:17px}
.math-card{position:relative;border:1px solid var(--line);background:var(--white);padding:19px 20px 17px;display:flex;flex-direction:column;min-height:285px;transition:border-color .16s}
.math-card:hover{border-color:#aaaE9e}
.math-card-top{display:flex;align-items:center;justify-content:space-between;gap:10px;color:var(--muted);font:9px/1.5 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:.35px}
.math-card h3{font:500 18px/1.55 var(--serif);margin:14px 0 5px}
.math-original{display:block;color:#7a7d74;font:italic 10px/1.65 Georgia,serif;overflow-wrap:anywhere;margin-bottom:14px}
.math-plain{font-size:11px;line-height:1.85;color:#50584f;margin:0 0 16px;padding:11px 12px;background:#f1f1eb;border-left:2px solid var(--math)}
.math-paper-summary{display:flex;justify-content:space-between;gap:14px;align-items:center;margin-top:auto;padding-top:12px;border-top:1px solid #ecece5;font-size:9px;color:var(--muted)}
.math-paper-summary button,.math-paper-summary a{font-size:10px;color:var(--math);white-space:nowrap}
#math-load-more{display:block;margin:25px auto 0;min-width:180px;background:var(--white)}
#math-load-more:hover{border-color:var(--ink)}

/* Product releases are kept visually separate from research claims. */
.ai-news{padding-top:62px}
.ai-news-list{border-top:1px solid var(--line)}
.ai-news-item{display:grid;grid-template-columns:105px 155px minmax(0,1fr) 24px;gap:20px;align-items:start;padding:20px 5px;border-bottom:1px solid var(--line);transition:background-color .15s}
.ai-news-item:hover{background:#efefe8}
.news-date{font:10px/1.5 ui-monospace,SFMono-Regular,Consolas,monospace;color:var(--muted);font-variant-numeric:tabular-nums}
.news-provider{font-size:10px;font-weight:600;color:var(--blueprint);letter-spacing:.3px}
.ai-news-item h3{font:500 17px/1.5 var(--serif);margin:0 0 5px}.ai-news-item p{font-size:10px;line-height:1.75;color:var(--muted);margin:0}.ai-news-item>a:last-child{font-size:12px;color:var(--accent);text-align:right}

/* Detail records keep contribution, evidence and linked papers separate. */
.detail-contribution{margin:21px 0 7px}
.detail-contribution>h3,.evidence-panel>h3{font-size:11px;font-weight:550;letter-spacing:.6px;color:var(--blueprint);margin:0 0 10px}
.contribution-grid{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.contribution-grid>div{padding:15px 16px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:#f6f6f1}
.contribution-grid strong{display:block;font-size:9px;letter-spacing:.8px;color:var(--muted);margin-bottom:6px}.contribution-grid p{font-size:11px;line-height:1.8;margin:0}
.evidence-panel{padding:16px 17px;margin:21px 0;background:#edf0eb;border-left:2px solid var(--olive)}.evidence-panel p{font-size:11px;line-height:1.8;margin:0;color:#5f6960}
.paper-list{list-style:none;padding:0;margin:0;border-top:1px solid var(--line)}.paper-list li{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:12px;align-items:start;padding:12px 0;border-bottom:1px solid var(--line)}.paper-list a{font-size:11px;line-height:1.7;text-decoration:underline;text-decoration-color:#c9ccbf;text-underline-offset:3px;overflow-wrap:anywhere}.paper-list a:hover{color:var(--accent)}

/* Curated external references. */
.resource-section{padding-top:58px;margin-top:58px;border-top:1px solid var(--line)}
.resource-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border-top:1px solid var(--line);border-left:1px solid var(--line)}
.resource-card{position:relative;min-height:188px;display:flex;flex-direction:column;padding:22px 23px 19px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--white);transition:background-color .15s}
.resource-card:hover{background:#efefe8}
.resource-card>span:first-child,.resource-card .resource-kind{font-size:9px;letter-spacing:1px;color:var(--olive)}
.resource-card h3{font:500 20px/1.45 var(--serif);margin:13px 0 7px;padding-right:20px}.resource-card p{font-size:10px;line-height:1.8;color:var(--muted);margin:0 0 15px}.resource-card>span:last-child,.resource-card .resource-link{margin-top:auto;font-size:10px;color:var(--accent)}
.resource-card:after{content:"↗";position:absolute;right:19px;top:20px;color:var(--muted);font-size:11px}

@media(max-width:1100px){
  .discipline-card{padding:20px;min-height:150px}.discipline-card h3{font-size:19px}
  .ai-home{gap:35px}.ai-home-cards{grid-template-columns:1fr}.ai-home-card{min-height:170px}
  .ai-page-head{gap:35px}.ai-toolbar{grid-template-columns:130px 150px 170px minmax(190px,1fr)}
  .resource-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media(max-width:900px){
  .header-inner nav{gap:16px}.header-inner nav a{font-size:12px}
  .discipline-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ai-page-head{grid-template-columns:1fr}.ai-principle{max-width:520px}
  .ai-stats{grid-template-columns:repeat(2,1fr)}
  .ai-toolbar{grid-template-columns:repeat(2,minmax(0,1fr))}
  .math-catalog-head{grid-template-columns:1fr}.math-status-legend{max-width:430px}
  .catalog-warning{grid-template-columns:1fr}.catalog-warning a{justify-self:start}
  .feature-math span{font-size:63px}
}

@media(max-width:650px){
  .header-inner nav{gap:20px;overflow-x:auto;scrollbar-width:none;padding-right:5px}.header-inner nav::-webkit-scrollbar{display:none}.header-inner nav a{flex:0 0 auto;font-size:11px}
  .feature{grid-template-columns:1fr 1.25fr}.feature-math{height:auto;min-height:185px;padding:27px 17px 22px;grid-template-columns:1fr}.feature-math:before{width:210px;height:210px;left:-90px;top:15px}.feature-math:after{right:15px;top:15px;font-size:7px;max-width:88px;text-align:right}.feature-math span{font-size:48px;letter-spacing:-3px}.feature-math i{left:18px;bottom:14px;font-size:6px}.feature-math b{font-size:27px;padding-left:10px;align-self:end}.feature .feature-body{padding-top:13px}
  .discipline-section{padding-top:41px;padding-bottom:42px}.discipline-grid{grid-template-columns:1fr}.discipline-card{min-height:128px;padding:18px 20px}.discipline-card h3{font-size:19px;margin-top:8px}.discipline-card p{font-size:10px;max-width:85%}.discipline-card strong,.discipline-card .discipline-count{padding-top:11px}
  .ai-home{grid-template-columns:1fr;gap:28px;padding-top:43px;padding-bottom:44px}.ai-home>div:first-child{position:static}.ai-home h2{font-size:27px}.ai-home-cards{gap:12px}.ai-home-card{min-height:164px;padding:19px}
  .ai-page-head{padding-bottom:28px;gap:27px}.ai-page-head h1{font-size:34px}.ai-principle{padding:15px 17px}
  .ai-stats{margin:21px 0 43px}.ai-stat{padding:14px 15px;min-height:76px}.ai-stat strong{font-size:23px}
  .ai-advances{padding-bottom:44px}.ai-toolbar{grid-template-columns:1fr 1fr;padding:10px;gap:9px}.ai-toolbar .ai-search{grid-column:1/-1}
  .ai-year-section{margin-top:28px}.ai-year-head h3,.ai-year-head strong{font-size:25px}.ai-card-grid{grid-template-columns:1fr;gap:12px}.ai-card{min-height:0;padding:18px}.ai-card h3{font-size:20px}.ai-card-foot{align-items:center}
  .math-catalog{padding:44px 0}.math-catalog-head{gap:25px}.math-catalog-head h2{font-size:26px}.math-status-legend{padding:14px 16px}.catalog-warning{gap:9px;margin:19px 0;padding:15px}.catalog-warning strong{font-size:13px}.math-toolbar{grid-template-columns:1fr;gap:10px}.math-toolbar .select-label{justify-content:space-between;border:1px solid var(--line);background:var(--white);padding:6px 9px}.math-catalog-grid{grid-template-columns:1fr;gap:11px}.math-card{min-height:0;padding:18px}.math-card h3{font-size:18px}
  .ai-news{padding-top:44px}.ai-news-item{grid-template-columns:82px 1fr 20px;gap:10px 12px;padding:17px 3px}.news-provider{grid-column:2}.ai-news-item>div,.ai-news-item h3,.ai-news-item p{grid-column:1/3}.ai-news-item>a:last-child{grid-column:3;grid-row:1/4}
  .contribution-grid{grid-template-columns:1fr}.paper-list li{grid-template-columns:1fr}.paper-status{justify-self:start}
  .resource-section{padding-top:42px;margin-top:42px}.resource-grid{grid-template-columns:1fr}.resource-card{min-height:155px;padding:19px 20px}
}

@media(max-width:420px){
  .feature{grid-template-columns:1fr}.feature-math{min-height:155px}.feature-math b{justify-self:end}.feature .feature-body{padding:17px 19px 21px}
  .ai-toolbar{grid-template-columns:1fr}.ai-toolbar .ai-search{grid-column:auto}
  .ai-stats{grid-template-columns:1fr 1fr}
}

/* Keep wide filter rows and long mathematical titles inside their own containers. */
html,body{overflow-x:hidden}
.domain-filter-scroll{max-width:100%;overflow-x:auto;scrollbar-width:thin}
.math-card,.ai-card,.resource-card,.ai-news-item{min-width:0}

/* A quiet, privacy-conscious site counter at the end of the homepage. */
.visitor-counter{display:grid;grid-template-columns:minmax(260px,1fr) auto minmax(250px,.7fr);gap:34px;align-items:end;padding-top:31px;padding-bottom:31px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.visitor-counter h2{font:500 24px/1.5 var(--serif);letter-spacing:-.2px;margin:8px 0 0}
.visitor-total{display:flex;align-items:baseline;gap:12px;min-width:190px}
.visitor-total strong{font:400 47px/1 Georgia,serif;color:var(--accent);font-variant-numeric:tabular-nums;letter-spacing:-1px}
.visitor-total span{font-size:10px;letter-spacing:1px;color:var(--muted);white-space:nowrap}
.visitor-counter>p{font-size:10px;line-height:1.8;color:var(--muted);margin:0;text-align:right}

@media(max-width:900px){
  .visitor-counter{grid-template-columns:1fr auto}
  .visitor-counter>p{grid-column:1/-1;text-align:left}
}

@media(max-width:650px){
  .visitor-counter{grid-template-columns:1fr;gap:17px;padding-top:26px;padding-bottom:27px}
  .visitor-total{min-width:0}
  .visitor-total strong{font-size:41px}
  .visitor-counter>p{grid-column:auto}
}

/* Creator attribution and publication register. */
.creator-signature{display:grid;grid-template-columns:auto auto 1fr auto;gap:18px;align-items:baseline;margin-top:24px;margin-bottom:0;padding-top:17px;padding-bottom:17px;background:var(--ink);color:var(--white)}
.creator-signature>span{font-size:8px;letter-spacing:1.8px;color:#bcbcaf}.creator-signature strong{font:500 18px/1.3 var(--serif);white-space:nowrap}.creator-signature p{margin:0;font-size:10px;color:#cacac0}.creator-signature p span{font-variant-numeric:tabular-nums}.creator-signature a{font-size:10px;color:#fff;white-space:nowrap;border-bottom:1px solid #69695f;padding-bottom:2px}
.creator-hero{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(275px,.55fr);gap:70px;align-items:start;padding-bottom:50px;border-bottom:1px solid var(--line)}
.creator-hero h1{font:500 clamp(39px,5vw,58px)/1.28 var(--serif);letter-spacing:-1.4px;margin:18px 0 20px}.creator-lead{max-width:760px;font-size:15px;line-height:2;color:var(--muted);margin:0}.creator-lead strong{color:var(--ink);font-weight:550}.creator-links{display:flex;flex-wrap:wrap;gap:12px;margin-top:29px}.creator-links .secondary-button{display:inline-flex;align-items:center;gap:12px}
.creator-id-card{background:#e9eadd;border-top:3px solid var(--olive);padding:29px 29px 25px}.creator-id-card>span{font-size:9px;letter-spacing:2px;color:var(--olive)}.creator-id-card>strong{display:block;font:500 45px/1.05 var(--serif);letter-spacing:-1.8px;margin:28px 0 30px}.creator-id-card dl{margin:0;border-top:1px solid #d2d6c6}.creator-id-card dl>div{display:flex;justify-content:space-between;gap:16px;padding:10px 0;border-bottom:1px solid #d2d6c6}.creator-id-card dt,.creator-id-card dd{margin:0;font-size:9px;color:var(--muted)}.creator-id-card dd{text-align:right;color:var(--ink)}
.creator-principles{display:grid;grid-template-columns:1fr 1fr;gap:24px;padding:42px 0}.creator-principles article{border:1px solid var(--line);background:var(--white);padding:26px 28px}.creator-principles article>span{font:11px/1 ui-monospace,SFMono-Regular,Consolas,monospace;color:var(--accent)}.creator-principles h2{font:500 22px/1.5 var(--serif);margin:13px 0 9px}.creator-principles p{font-size:12px;line-height:1.95;color:var(--muted);margin:0}
.creator-publications{padding-top:51px;border-top:1px solid var(--line)}.publication-method{display:grid;grid-template-columns:1fr 1fr;gap:1px;margin:0 0 29px;background:var(--line);border:1px solid var(--line)}.publication-method p{background:#f0f1e9;margin:0;padding:18px 20px;font-size:10px;line-height:1.9;color:var(--muted)}.publication-method p:last-child:nth-child(3){grid-column:1/-1}.publication-method strong{color:var(--ink)}.publication-method a{color:var(--accent);text-decoration:underline;text-decoration-color:#c7a99f;text-underline-offset:3px}
.publication-group{border-top:1px solid var(--line)}.publication-group:last-of-type{border-bottom:1px solid var(--line)}.publication-group summary{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:20px 3px;cursor:pointer;list-style:none}.publication-group summary::-webkit-details-marker{display:none}.publication-group summary:before{content:"＋";font-size:18px;color:var(--accent);margin-right:4px}.publication-group[open] summary:before{content:"−"}.publication-group summary span{font:500 23px/1.4 var(--serif);margin-right:auto}.publication-group summary strong{font:500 10px/1.4 var(--sans);letter-spacing:1px;color:var(--muted)}
.publication-list{list-style:none;counter-reset:publication;margin:0 0 26px;padding:0;border-top:1px solid var(--line);background:var(--white)}.publication-list li{counter-increment:publication;display:grid;grid-template-columns:35px minmax(0,1fr) minmax(205px,.42fr);gap:17px;align-items:center;padding:15px 17px;border:1px solid var(--line);border-top:0}.publication-list li:before{content:counter(publication,decimal-leading-zero);font:9px/1 ui-monospace,SFMono-Regular,Consolas,monospace;color:#9b9e90}.publication-list li>div{min-width:0}.publication-list li>div strong{display:block;font:500 14px/1.55 var(--serif);overflow-wrap:anywhere}.publication-list li>div span{display:block;margin-top:3px;font-size:9px;color:var(--muted)}.publication-list li>a{font:9px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;color:var(--accent);text-align:right;overflow-wrap:anywhere;word-break:break-word}.publication-list li>a small{display:block;font:600 8px/1.4 var(--sans);letter-spacing:1.2px;color:var(--muted)}
.language-switch{flex:0 0 auto;display:inline-flex;align-items:center;justify-content:center;min-width:38px;padding:8px 9px;border:1px solid var(--line);border-radius:2px;font:600 10px/1 var(--sans);letter-spacing:.8px;color:var(--muted)}.language-switch:hover{border-color:var(--accent);color:var(--accent)}
.publication-list .publication-contribution{display:block;margin:8px 0 0;padding-left:10px;border-left:2px solid #bdc5b1;font:600 11px/1.75 var(--sans);color:#4f5c48}.publication-list .publication-contribution b{font-weight:700;color:var(--ink)}.publication-list .publication-note{display:block;margin-top:5px;font:9px/1.65 var(--sans);color:#8a8d82}
.scholar-extra{margin-top:34px;padding:25px 28px;border-left:3px solid var(--math);background:#f2ede3}.scholar-extra>span{font-size:8px;letter-spacing:1.5px;color:var(--math)}.scholar-extra h3{font:500 19px/1.55 var(--serif);margin:10px 0 7px}.scholar-extra p{font-size:10px;line-height:1.85;color:var(--muted);margin:0 0 11px}.scholar-extra a{font-size:10px;color:var(--accent);border-bottom:1px solid #c7a99f;padding-bottom:2px}

@media(max-width:900px){
  .creator-signature{grid-template-columns:auto auto 1fr}.creator-signature a{grid-column:2/4}
  .creator-hero{grid-template-columns:1fr;gap:32px}.creator-id-card{max-width:520px}.creator-id-card>strong{font-size:40px}
}

@media(max-width:650px){
  .creator-signature{grid-template-columns:1fr 1fr;gap:8px 14px;margin-top:17px}.creator-signature>span{grid-column:1/-1}.creator-signature p{grid-column:1/-1;line-height:1.7}.creator-signature a{grid-column:1/-1;justify-self:start}
  .creator-hero{padding-bottom:35px}.creator-hero h1{font-size:38px}.creator-lead{font-size:13px;line-height:1.9}.creator-links{align-items:flex-start;flex-direction:column}.creator-id-card{padding:24px}.creator-id-card>strong{font-size:36px;margin:22px 0 24px}
  .creator-principles{grid-template-columns:1fr;gap:13px;padding:31px 0}.creator-principles article{padding:22px}.creator-publications{padding-top:38px}.publication-method{grid-template-columns:1fr}.publication-group summary{padding:17px 2px}.publication-group summary span{font-size:20px}.publication-list li{grid-template-columns:24px minmax(0,1fr);gap:10px;padding:14px 11px}.publication-list li>a{grid-column:2;text-align:left}.scholar-extra{padding:21px 22px}.language-switch{margin-left:0}
}

/* The language control adds one more header item; wrap before links collide. */
@media(max-width:900px){
  .site-header{height:auto}
  .header-inner{padding:15px 25px 0;flex-wrap:wrap;gap:12px}
  .header-inner nav{order:3;width:100%;height:auto;overflow-x:auto;scrollbar-width:none;gap:24px}
  .header-inner nav::-webkit-scrollbar{display:none}
  .header-inner nav a{flex:0 0 auto;padding:9px 0 14px}
  .header-inner nav a.active:after{bottom:4px}
  .header-brief{margin-left:auto}
}
@media(max-width:650px){
  .header-inner{padding:19px 21px 0;gap:15px}
  .header-inner nav{gap:20px}
}