/* Shared interaction components. Keep publication styles in editorial.css. */
body>header{position:relative;z-index:30;min-height:76px;gap:12px;padding-top:12px;padding-bottom:12px}
body>header .brand{flex-shrink:0;line-height:1;white-space:nowrap}
.category-nav{display:flex;align-items:center;gap:4px;margin-left:auto;flex-basis:auto;order:0;border:0;padding:0;width:auto}
.nav-category{position:relative;min-width:0}
.nav-category>summary{display:flex;align-items:center;justify-content:center;gap:7px;min-height:42px;padding:0 11px;border:1px solid transparent;border-radius:7px;font:500 13px/20px var(--font-ui);letter-spacing:0;list-style:none;color:#424245;white-space:nowrap}
.nav-category>summary::marker{content:''}.nav-category>summary::-webkit-details-marker{display:none}
.nav-chevron{display:block;width:16px;height:16px;flex:0 0 16px;align-self:center;transition:transform .16s ease;color:#737378}
.nav-category>summary:hover{background:#f5f5f7;border-color:#e9e9ec}.nav-category[open]>summary{background:#f1f1f3;border-color:#dedee2;color:#1d1d1f}.nav-category.is-current>summary{color:#1d1d1f;background:#f7f7f8}
.nav-category[open] .nav-chevron{transform:rotate(180deg)}
.nav-dropdown{z-index:60;position:absolute;top:calc(100% + 8px);left:0;right:auto;min-width:244px;max-width:min(320px,calc(100vw - 44px));padding:6px;border:1px solid #e1e1e5;border-radius:10px;background:#fff;box-shadow:0 10px 30px #00000012}
.nav-category:last-child .nav-dropdown{left:auto;right:0}
.nav-dropdown a{min-height:44px;padding:10px 12px;gap:16px;border-radius:6px;font:400 14px/1.5 var(--font-ui);white-space:normal;align-items:center;color:#424245}
.nav-dropdown a[aria-current=page]{font-weight:600;background:#f1f1f3}.nav-dropdown a:hover{background:#f5f5f7;color:#1d1d1f}.nav-dropdown a span{font-size:14px;line-height:1;flex-shrink:0}
.nav-search{display:inline-flex;align-items:center;min-height:42px;padding:0 10px;font:400 13px/20px var(--font-ui);border-radius:7px}.nav-search:hover{background:#f5f5f7}
body>header .language{display:flex;align-items:center;gap:8px;margin-left:0;font:400 12px/20px var(--font-ui)}
body>header .language select{height:42px;min-height:42px;border:1px solid #dedee3;border-radius:7px;background:#fafafa;font:400 13px/20px var(--font-ui);padding:0 10px;max-width:140px}
.nav-toggle{display:none;width:42px;height:42px;min-height:42px;padding:0;align-items:center;justify-content:center;flex-shrink:0}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid #414147;outline-offset:3px}
button:disabled{cursor:not-allowed;opacity:.55}.button,button,input,select{font-family:var(--font-ui)}.actions{flex-wrap:wrap;row-gap:10px}
.paper-reading .article-hero>p,.reading .article-hero>p{font-size:17px;line-height:1.75}.paper-reading .article-hero>.paper-meta,.paper-reading .notice,.paper-reading p.notice,.paper-reading .note,.paper-reading p.note,.reading .notice,.reading .note{font:400 13px/1.75 var(--font-ui)}
main section,main article,.home-route,.frontier-preview{min-width:0}main p,main li,main a{overflow-wrap:anywhere}main img,main video,main canvas{max-width:100%;height:auto}pre{max-width:100%;overflow:auto;tab-size:2}pre code{overflow-wrap:normal;word-break:normal}table{max-width:100%;border-collapse:collapse}th,td{vertical-align:top;overflow-wrap:anywhere}.prose-section table,.paper-reading table{display:block;width:100%;overflow-x:auto}.rendered-formula{max-width:100%;overflow-x:auto}.paper-reading details summary,.reading details summary{cursor:pointer;min-height:40px;padding-top:8px;padding-bottom:8px}.lesson-notebook input,.lesson-notebook textarea{max-width:100%}
@media(max-width:1100px) and (min-width:701px){body>header .category-nav{order:3;flex-basis:100%;width:100%;margin:4px 0 0;padding-top:8px;border-top:1px solid #ededee;justify-content:space-between}body>header .language{margin-left:auto}.nav-category>summary{padding:0 10px}.nav-search{margin-left:0}}
@media(max-width:700px){body>header{gap:8px;min-height:68px;padding-top:10px;padding-bottom:10px}body>header .brand{font-size:20px;gap:7px;order:0}.brand .logo{width:27px;height:29px;font-size:17px}body>header .language{order:1;margin-left:auto;font-size:0;gap:0}body>header .language select{font-size:12px;max-width:100px;width:92px;padding:0 6px}.nav-ready .nav-toggle{display:inline-flex;order:2}.nav-ready body>header:not(.nav-open) .category-nav,.nav-ready body>header:not(.nav-open) .nav-search{display:none}.nav-search{order:3;flex-basis:100%;margin:0;padding:0 10px;border-top:1px solid #ededee;border-radius:0}.category-nav{order:4;display:block;width:100%;flex-basis:100%;margin:0;border:0;padding:0}.nav-category>summary{justify-content:space-between;min-height:46px;padding:0 10px;font-size:14px;border-radius:6px}.nav-category .nav-dropdown,.nav-category:last-child .nav-dropdown{position:static;min-width:0;width:100%;max-width:none;box-shadow:none;margin:4px 0 10px;background:#fafafa;padding:5px;border:1px solid #e9e9ec}.nav-dropdown a{font-size:14px;min-height:44px}.flow-step{padding:18px}.stats{grid-template-columns:repeat(2,minmax(0,1fr))}.tool-nav{overflow-x:auto;flex-wrap:nowrap;max-width:100%}.tool-nav a{white-space:nowrap;flex:0 0 auto}.paper-reading .article-hero>p,.reading .article-hero>p{font-size:16px}.paper-reading p.paper-meta,.paper-reading p.notice,.paper-reading p.note{font-size:13px}.prose-section pre{font-size:12px}body>footer{flex-wrap:wrap;gap:12px}}
@media(prefers-reduced-motion:reduce){.nav-chevron{transition:none}}
@media(max-width:380px){:root{--site-gutter:16px}body>header{gap:6px}.brand{letter-spacing:-.65px}body>header .brand{font-size:18px;gap:6px}body>header .language select{width:80px;max-width:80px}.nav-toggle{width:40px}.paper-reading,.reading{padding-left:16px;padding-right:16px}}

/* Research illustrations keep the established newspaper grid. */
.frontier-preview .research-thumb{width:100%;height:auto;aspect-ratio:15/8;object-fit:cover;border-radius:4px;margin:0 0 16px}.frontier-preview:not(:first-child) .research-thumb{max-height:120px;object-fit:cover}.frontier-preview .post-date{font:12px/1.5 system-ui,sans-serif;color:#676767;margin:8px 0}#adaptive-output{white-space:pre-wrap;overflow-wrap:anywhere;max-height:480px;overflow:auto}
/* Native select keeps keyboard behavior; one controlled chevron and focus ring. */
body>header .language select{appearance:none;-webkit-appearance:none;box-sizing:border-box;min-width:112px;max-width:none;padding:0 34px 0 12px;background:#fafafa url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16'%3E%3Cpath d='m4 6 4 4 4-4' fill='none' stroke='%23585860' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") no-repeat right 10px center;box-shadow:none;outline:none;line-height:normal;cursor:pointer}
body>header .language select:focus-visible{outline:2px solid #62626b;outline-offset:2px;border-color:#62626b}
@media(max-width:700px){body>header .language select{min-width:100px;width:100px;padding-left:9px;padding-right:29px;background-position:right 8px center}}
@media(max-width:380px){body>header .language select{min-width:92px;width:92px}}

.frontier-preview:not(:first-child) .research-thumb{height:auto;max-height:none;object-fit:contain}

.frontier-preview .research-thumb{border-radius:2px}.frontier-preview:not(:first-child) .research-thumb{height:150px;object-fit:cover}.frontier-preview:first-child .research-thumb{max-height:265px;object-fit:cover}
/* Illustrated stories need balanced rows instead of a three-row lead. */
.news-home .frontier-preview:first-child{grid-row:auto;align-self:start}
.news-home .frontier-preview:nth-child(-n+4){grid-column:span 2}
.news-home .frontier-preview:nth-child(-n+4) .research-thumb{height:240px;max-height:none;object-fit:contain;background:#f1f0ec}
.news-home .frontier-preview:nth-child(n+5) .research-thumb{height:auto;aspect-ratio:15/8;object-fit:contain}
@media(max-width:950px){.news-home .frontier-preview:nth-child(-n+4){grid-column:auto;grid-row:auto}.news-home .frontier-preview:nth-child(-n+4) .research-thumb{height:auto;aspect-ratio:15/8}}
@media(max-width:650px){.news-home .frontier-preview:first-child{padding:18px}.news-home .frontier-preview:nth-child(-n+4){grid-column:auto;grid-row:auto}}
.latest-learning{margin-top:26px;border-top:1px solid #d7d5d0;padding-top:24px}.latest-learning-heading{display:flex;align-items:baseline;gap:16px;margin-bottom:20px}.latest-learning-heading h3{margin:0;font:700 23px/1.3 var(--font-reading)}.latest-learning-heading p{margin:0;font:13px/1.6 var(--font-ui);color:#717175}.latest-learning-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 32px}.learning-news{display:block;padding:22px 0;border-bottom:1px solid #dedede;min-width:0}.learning-news h4{font:700 24px/1.28 var(--font-reading);letter-spacing:-.35px;margin:8px 0 10px}.learning-news p{font:400 15px/1.65 var(--font-ui);color:#626266;margin:0}.learning-news-meta{display:flex;flex-wrap:wrap;gap:12px;font:12px/1.6 var(--font-ui);color:#737377;margin-top:14px}.learning-news-read{display:inline-block;font:13px/1.6 var(--font-ui);margin-top:12px}.learning-news:hover h4{text-decoration:underline;text-underline-offset:4px}.learning-news-lead{grid-column:1/-1;display:grid;grid-template-columns:1fr 1.3fr;align-items:center;gap:30px;padding:0 0 24px}.learning-news-lead img{display:block;width:100%;height:auto;aspect-ratio:15/8;object-fit:contain;background:#f1f0ec}.learning-news-lead h4{font-size:30px}@media(max-width:650px){.latest-learning-grid{grid-template-columns:1fr}.latest-learning-heading{display:block}.latest-learning-heading p{margin-top:6px}.learning-news-lead{grid-template-columns:1fr;gap:16px}.learning-news-lead h4{font-size:26px}.learning-news h4{font-size:22px}.learning-news{padding:20px 0}}