:root{color-scheme:light;--paper:#eaf4fc;--surface:#fff;--ink:#193440;--quiet:#516873;--line:#bfd5e5;--accent:#086678;--deep:#193d4b;--soft:#dcedfa;--panel:#f5faff;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px;line-height:1.65;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:inherit}a{color:var(--accent);text-underline-offset:4px}a:hover{text-decoration-thickness:2px}button,input,select,textarea{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #3781a0;outline-offset:4px}img,video,svg{max-width:100%;height:auto}iframe{max-width:100%;border:0}button[hidden],[hidden]{display:none!important}h1,h2,h3,h4,p{margin:0}h1,h2,h3{line-height:1.14;letter-spacing:-.035em}h1{font-size:clamp(2.35rem,5.7vw,4.4rem);max-width:15ch;font-weight:700}h2{font-size:clamp(1.5rem,3vw,2.1rem);font-weight:600}h3{font-size:1.2rem;font-weight:600}p{overflow-wrap:anywhere}h1,h2,h3{overflow-wrap:break-word}button{border:0}main{display:block}.skip-link{position:absolute;left:16px;top:-90px;padding:12px;background:var(--ink);color:#fff;z-index:50}.skip-link:focus{top:12px}
.site-header,.site-footer,body>main{max-width:1180px;margin:0 auto;padding-left:36px;padding-right:36px}.site-header{min-height:103px;display:flex;align-items:center;gap:22px;border-bottom:1px solid var(--line)}.brand{font-size:29px;line-height:1;letter-spacing:-1.8px;color:var(--ink);text-decoration:none;font-weight:750;white-space:nowrap}.brand span{color:var(--accent)}.byline{font-size:.66rem;letter-spacing:.1em;color:var(--quiet);line-height:1.5;max-width:14ch}.site-nav{margin-left:auto;display:flex;align-items:center;gap:23px}.site-nav a{font-size:.84rem;color:var(--ink);text-decoration:none;padding:10px 0}.site-nav a[aria-current=page]{box-shadow:inset 0 -2px var(--accent);font-weight:650}.nav-toggle{display:none}.eyebrow{text-transform:uppercase;font-size:.72rem;letter-spacing:.14em;font-weight:650;color:var(--accent)}.lede{font-size:1.12rem;line-height:1.65;color:var(--quiet);max-width:60ch}.textlink{font-weight:600;font-size:.9rem;text-decoration:none;display:inline-flex;align-items:center;gap:20px;padding:10px 0}.primary-link{display:inline-flex;align-items:center;justify-content:center;gap:20px;background:var(--deep);color:#fff;padding:12px 20px;text-decoration:none;font-size:.9rem;border-radius:3px}.hero{display:grid;grid-template-columns:1.4fr 1fr;align-items:end;gap:65px;padding:67px 0 48px}.hero h1{margin:17px 0 22px}.hero .lede{font-size:1.08rem;max-width:46ch}.hero-note{border-left:1px solid var(--line);padding:6px 0 6px 28px;color:var(--quiet);max-width:30ch;font-size:.92rem}.hero-note strong{display:block;color:var(--ink);margin-bottom:10px;font-weight:600}.hero-actions{display:flex;gap:25px;align-items:center;flex-wrap:wrap;margin-top:25px}
.feature-switch{display:flex;flex-wrap:wrap;border-bottom:1px solid var(--line);gap:10px}.feature-switch button{padding:13px 22px;border-bottom:3px solid transparent;background:transparent;color:var(--quiet);font-size:.86rem}.feature-switch button[aria-pressed=true]{border-bottom-color:var(--accent);color:var(--ink);font-weight:650}.feature-panel{display:grid;grid-template-columns:1.3fr 1fr;gap:45px;align-items:center;min-height:320px;padding:40px 46px;background:var(--deep);color:#f2f7f8}.feature-panel h2{font-size:2.5rem;margin:12px 0 17px}.feature-panel p{color:#cbdde4;max-width:52ch;font-size:.97rem}.feature-panel .eyebrow{color:#abd0db}.feature-panel .textlink{color:#fff;margin-top:12px}.feature-art{display:grid;place-items:center;min-height:220px}.feature-art img{width:154px;height:154px;object-fit:contain}.feature-caption{font-size:.72rem!important;letter-spacing:.1em;margin-top:16px;text-align:center}.source-flow{display:grid;gap:12px;width:100%;max-width:260px}.source-flow span{display:block;padding:12px 0;border-bottom:1px solid #60828e;color:#e1eff2}.chess-grid{background:repeating-conic-gradient(#e8f4fc 0% 25%,#738c93 0% 50%) 50%/48px 48px;width:202px;height:202px;border:5px solid #5a7681;display:grid;place-items:center}.chess-grid img{width:95px;height:95px;filter:drop-shadow(0 4px 3px #19344040)}.section-heading{display:flex;justify-content:space-between;align-items:baseline;gap:24px;border-top:1px solid var(--line);padding-top:23px;margin:51px 0 24px}.section-heading p{font-size:.84rem;color:var(--quiet)}.project-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:36px}.project-item{padding:7px 0 18px}.project-item .eyebrow{margin-bottom:14px}.project-item h3{font-size:1.5rem;margin-bottom:13px}.project-item p{color:var(--quiet);font-size:.93rem}.project-item .textlink{margin-top:11px}.book-feature{display:grid;grid-template-columns:145px 1fr auto;align-items:center;gap:35px;background:var(--soft);padding:30px 36px;margin:40px 0}.book-feature img{width:120px;box-shadow:6px 6px 0 #c5d5da}.book-feature h2{margin:8px 0 12px}.book-feature p{font-size:.94rem;color:var(--quiet);max-width:58ch}.journal-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px}.journal-item h3{font-size:1.24rem;margin:11px 0 15px;line-height:1.25}.journal-item h3 a{text-decoration:none;color:var(--ink)}.journal-item p:not(.eyebrow){font-size:.9rem;color:var(--quiet)}.journal-item .textlink{margin-top:10px}.site-footer{border-top:1px solid var(--line);margin-top:65px;padding-top:23px;padding-bottom:30px;display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:8px 24px;color:var(--quiet);font-size:.78rem}.site-footer>span{flex:0 0 auto;max-width:100%}.site-footer nav{display:flex;flex-wrap:wrap;align-items:center;max-width:100%;min-width:0;gap:2px 22px}.site-footer a{color:var(--quiet);display:inline-flex;align-items:center;min-height:44px;white-space:nowrap}.site-footer button{white-space:nowrap}.page-intro{padding:56px 0 35px}.page-intro h1{margin:16px 0 21px;max-width:22ch}.page-intro .lede{max-width:66ch}.resource-list{display:grid;grid-template-columns:1fr 1fr;gap:0 44px}.resource-item{padding:26px 0;border-top:1px solid var(--line)}.resource-item h2{font-size:1.45rem;margin:7px 0 12px}.resource-item p{font-size:.94rem;color:var(--quiet)}
.article{max-width:820px;margin:0 auto;padding:34px 0}.backlink{font-size:.84rem}.article-header{padding:37px 0 30px;border-bottom:1px solid var(--line);margin-bottom:32px}.article-header h1{font-size:clamp(2.1rem,4.7vw,3.4rem);max-width:24ch;margin:15px 0 19px}.article-meta{font-size:.8rem;color:var(--quiet);margin-bottom:22px}.article-header .lede{font-size:1.12rem;line-height:1.7}.tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:23px}.tag{font-size:.72rem;padding:4px 9px;text-decoration:none;border:1px solid var(--line);border-radius:3px;overflow-wrap:anywhere}.prose{font-size:1.04rem;line-height:1.85;max-width:72ch}.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote,.prose table{margin:0 0 1.5em}.prose h2{font-size:1.6rem;line-height:1.3;margin:1.8em 0 .8em}.prose h3{font-size:1.24rem;line-height:1.4;margin:1.5em 0 .7em}.prose li{margin-bottom:.5em}.prose blockquote{border-left:3px solid var(--accent);padding:5px 0 5px 23px;margin-left:0;color:var(--quiet)}.prose pre{background:var(--soft);padding:18px;overflow:auto;font-size:.88rem;line-height:1.6;border-radius:3px}.prose code{overflow-wrap:anywhere}.prose table{display:block;overflow-x:auto;max-width:100%;border-collapse:collapse;font-size:.86rem}.prose th,.prose td{padding:9px 13px;border-bottom:1px solid var(--line);text-align:left}.prose img{height:auto;display:block;margin:25px auto;max-width:100%}.article-footer{display:flex;flex-wrap:wrap;justify-content:space-between;gap:20px;border-top:1px solid var(--line);margin-top:45px;padding-top:23px;font-size:.85rem}.blog-filters{display:flex;align-items:end;flex-wrap:wrap;gap:24px;border-top:1px solid var(--line);padding-top:25px}.blog-filters label{display:grid;gap:7px;font-size:.8rem}.blog-filters label:first-child{flex:1;min-width:200px}.blog-filters input,.blog-filters select{background:var(--surface);border:1px solid #aabfc8;color:var(--ink);border-radius:3px;padding:10px 12px;min-height:46px;min-width:0;width:100%;font-size:1rem}.blog-filters a{font-size:.84rem;padding-bottom:10px}.result-count{color:var(--quiet);font-size:.8rem;margin:21px 0}.blog-row{display:grid;grid-template-columns:120px minmax(0,1fr) 20px;gap:27px;padding:29px 0;border-top:1px solid var(--line)}.blog-date{font-size:.77rem;color:var(--quiet);display:flex;flex-direction:column;gap:4px}.blog-row h2{font-size:1.45rem;line-height:1.3;margin:0 0 13px}.blog-row h2 a{color:var(--ink);text-decoration:none}.blog-row p{font-size:.94rem;color:var(--quiet);max-width:80ch}.row-arrow{color:var(--accent)}#blog-empty{padding:30px 0}
@media(max-width:900px){.site-header,.site-footer,body>main{padding-left:24px;padding-right:24px}.site-header{gap:18px}.byline{display:none}.site-nav{gap:18px}.hero{gap:36px;padding-top:45px}.book-feature{grid-template-columns:115px 1fr;padding:26px;gap:25px}.book-feature .primary-link{grid-column:2;justify-self:start}.project-grid,.journal-grid{gap:25px}.feature-panel{padding:32px;gap:30px}}
@media(max-width:680px){.site-header{min-height:83px;flex-wrap:wrap;padding-top:22px;padding-bottom:22px}.site-nav{width:100%;margin:8px 0 0;flex-wrap:wrap;gap:8px 22px}.site-nav a{min-height:44px;display:inline-flex;align-items:center}.js .nav-toggle{display:block;margin-left:auto;background:transparent;border:1px solid var(--line);border-radius:3px;color:var(--ink);padding:8px 13px;min-height:44px}.js .site-nav{display:none}.js .site-nav.is-open{display:flex}.hero{grid-template-columns:1fr;gap:24px;padding:37px 0 30px}.hero-note{max-width:none;border-left:0;border-top:1px solid var(--line);padding:20px 0 0;font-size:.87rem}.hero-note strong{display:inline;margin-right:5px}.hero .lede{font-size:1rem}.hero h1{max-width:15ch}.feature-switch{gap:0}.feature-switch button{padding:12px 16px;min-height:46px}.feature-panel{grid-template-columns:1fr;padding:27px;gap:18px}.feature-panel h2{font-size:2rem}.feature-art{min-height:180px}.chess-grid{width:180px;height:180px;background-size:43px 43px}.project-grid,.journal-grid{grid-template-columns:1fr;gap:20px}.project-item,.journal-item{padding-bottom:23px;border-bottom:1px solid var(--line)}.section-heading{margin-top:38px;flex-wrap:wrap;gap:10px}.book-feature{grid-template-columns:84px 1fr;padding:22px;gap:22px}.book-feature img{width:80px}.book-feature h2{font-size:1.5rem}.book-feature .primary-link{grid-column:1/-1;justify-self:stretch}.resource-list{grid-template-columns:1fr}.site-footer{flex-direction:column;align-items:stretch;margin-top:43px}.site-footer nav{gap:2px 20px}.site-footer a{min-height:44px;display:inline-flex;align-items:center}.page-intro{padding-top:37px}.blog-row{grid-template-columns:minmax(0,1fr) 18px;gap:10px}.blog-date{grid-column:1/-1;flex-direction:row;gap:12px;margin-bottom:4px}.blog-filters{gap:17px}.blog-filters label{width:100%}.blog-filters a{padding:8px 0}.article-header{padding-top:25px}.article-header .lede{font-size:1rem}.prose{font-size:1rem;line-height:1.8}.article-header h1{font-size:2.05rem}.tag{min-height:36px;display:inline-flex;align-items:center}}
@media(prefers-reduced-motion:no-preference){a,button{transition:color .15s,background-color .15s}}

.nav-group{position:relative}.nav-group summary{font-size:.84rem;padding:10px 0;cursor:pointer}.nav-group>div{position:absolute;top:100%;left:0;background:var(--surface);border:1px solid var(--line);padding:12px 18px;min-width:200px;z-index:10;display:grid;gap:6px}@media(max-width:680px){.nav-group>div{position:static}}

.home-areas>.section-heading{margin-top:10px}.home-area-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.home-area{padding:29px 32px;background:var(--panel);border:1px solid var(--line)}.home-area .eyebrow{margin-bottom:15px}.home-area h3{font-size:1.7rem;margin-bottom:14px}.home-area h3 a{color:var(--ink);text-decoration:none}.home-area p:not(.eyebrow){color:var(--quiet);font-size:.96rem;max-width:49ch}.home-area .textlink{margin-top:14px}.more-areas{display:flex;gap:36px;align-items:center;justify-content:space-between;border-top:1px solid var(--line);padding-top:30px;margin-top:48px}.more-areas h2{font-size:1.6rem;max-width:30ch;margin:12px 0}.more-areas p{color:var(--quiet);font-size:.93rem;max-width:66ch}.more-areas>a{flex-shrink:0}.glossary-context{font-size:.9rem;color:var(--quiet);margin-top:15px}.glossary-alphabet{display:flex;flex-wrap:wrap;gap:6px;margin:20px 0}.letter-filter{display:inline-flex;align-items:center;justify-content:center;min-width:38px;min-height:42px;padding:4px 9px;border:1px solid var(--line);text-decoration:none}.letter-filter[aria-current=true]{background:var(--deep);color:white}.glossary-row h2{line-height:1.3;overflow-wrap:anywhere}.glossary-row h2 a{color:var(--ink);text-decoration:none}.glossary-more{margin-top:25px}.utility-heading{font-size:1.6rem;margin:32px 0 23px}.site-nav{gap:18px}.site-nav a{font-size:.81rem}
@media(max-width:680px){.home-area-grid{grid-template-columns:1fr;gap:12px}.home-area{padding:25px 22px}.home-area h3{font-size:1.5rem}.more-areas{align-items:stretch;flex-direction:column;gap:18px}.more-areas>a{align-self:start}.glossary-alphabet{gap:5px}.letter-filter{min-width:36px;min-height:44px}}

/* Books share one catalogue, with separate editions for each work. */
.book-grid { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:28px; margin:28px 0 64px; }
.book-card { display:flex; flex-direction:column; min-width:0; background:var(--panel); border:1px solid #d7e2e7; border-radius:18px; overflow:hidden; }
.book-cover { display:flex; align-items:center; justify-content:center; padding:30px 24px; height:300px; background:var(--soft); text-decoration:none; }
.book-cover img { display:block; width:auto; max-width:100%; height:100%; object-fit:contain; box-shadow:8px 12px 18px #122d3926; }
.book-cover-placeholder { padding:24px; font-size:1.7rem; color:#213e4c; min-width:0; max-width:100%; overflow-wrap:anywhere; }
.book-card-copy { padding:26px; display:flex; flex-direction:column; flex:1; }
.book-card-copy h2 { font-size:1.45rem; line-height:1.2; margin:4px 0 16px; overflow-wrap:anywhere; }
.book-card-copy h2 a { color:inherit; text-decoration:none; }
.book-card-copy h2 a:hover { text-decoration:underline; text-underline-offset:4px; }
.book-card-copy > p:not(.eyebrow) { font-size:.95rem; color:#4b6471; line-height:1.65; }
.book-card-copy > .textlink { margin-top:auto; padding-top:20px; }
.book-editions { display:flex; flex-wrap:wrap; gap:8px; margin:10px 0; }
.book-editions span { font-size:.75rem; border:1px solid #cbdbe4; padding:4px 9px; border-radius:20px; color:#375767; }
.book-upcoming { display:inline-block; font-size:.8rem; font-weight:600; padding:5px 10px; border-radius:20px; background:var(--soft); color:#213e4c; }
.book-count,.book-language-note { color:#536e7d; }
.books-featured .section-heading { align-items:end; }
.books-featured .book-card-copy h2 { font-size:1.35rem; }
.book-detail { max-width:1000px; margin:0 auto; padding-top:32px; }
.book-detail .page-intro { padding-bottom:24px; }
.book-description { max-width:760px; margin-bottom:48px; }
.book-edition { display:grid; grid-template-columns:150px 1fr; gap:32px; padding:32px; margin:24px 0; background:var(--panel); border:1px solid #d7e2e7; border-radius:18px; }
.book-edition-cover img { width:100%; height:auto; box-shadow:5px 7px 14px #122d3920; }
.book-edition-cover .book-cover-placeholder { padding:20px 12px; min-height:210px; background:var(--soft); font-size:1.15rem; }
.book-edition h3 { margin:4px 0 8px; font-size:1.5rem; line-height:1.3; }
.book-edition p { margin:8px 0; }
.book-links { display:flex; flex-wrap:wrap; gap:22px; margin-top:24px; }
@media(max-width:1000px) { .book-grid { grid-template-columns:repeat(2,minmax(0,1fr)); gap:20px; } }
@media(max-width:620px) { .book-grid { grid-template-columns:1fr; } .book-cover { height:280px; } .book-card-copy { padding:22px; } .book-edition { grid-template-columns:1fr; padding:24px; gap:24px; } .book-edition-cover { max-width:170px; } .book-detail h1 { overflow-wrap:anywhere; } .books-featured .section-heading { align-items:start; } }

/* Keep shared visitor controls in the website palette, including cached visitor CSS. */
body .f97-preferences { background:var(--paper); border-color:var(--line); }
body .f97-language-notice { background:var(--soft); border-color:var(--line); }
body .f97-consent { background:var(--panel); border-color:var(--line); }
body .f97-consent button:focus-visible,body .f97-preferences :focus-visible { outline-color:#3781a0; }