:root{--finder-ink:#142942;--finder-muted:#53687e;--finder-line:#dce5ef;--finder-blue:#2563eb;--finder-bg:#f4f7fb}
html{scroll-behavior:smooth}body{background:var(--finder-bg);color:var(--finder-ink)}[hidden]{display:none!important}button,input,select,textarea{font:inherit}button,a,input,select,summary{touch-action:manipulation}button{cursor:pointer}:focus-visible{outline:3px solid #2563eb;outline-offset:3px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
.finder-intro{max-width:1120px;margin:0 auto;padding:36px 0 22px;display:flex;align-items:center;justify-content:space-between;gap:20px}.finder-intro h1{font-size:clamp(2rem,4vw,3.3rem);letter-spacing:-.045em;line-height:1.12;margin:0 0 12px}.finder-intro p:not(.eyebrow){color:var(--finder-muted);margin:0;font-size:1.05rem}.subject-drawing{width:108px;height:108px;display:grid;place-items:center;background:#e8efff;border-radius:26px;transform:rotate(5deg)}.subject-drawing svg{width:78px;height:78px}.physics{--accent:#225ccb;--tint:#edf3ff;color:var(--accent)}.chemistry{--accent:#137747;--tint:#edf8f0;color:var(--accent)}.biology{--accent:#0b7777;--tint:#eaf7f6;color:var(--accent)}
.tool-finder{max-width:1120px;margin:auto;padding:0 0 38px}.finder-search{display:flex;align-items:center;border:1px solid #bdccdc;border-radius:16px;background:white;box-shadow:0 5px 20px #14294208;padding:0 18px;gap:12px}.finder-search>svg{width:24px;fill:none;stroke:#52677d;stroke-width:2}.finder-search input{min-width:0;width:100%;border:0;background:transparent;padding:19px 0;outline:0;color:var(--finder-ink);font-size:1.06rem;box-shadow:none}.finder-search:focus-within{outline:3px solid #2563eb40;border-color:#2563eb}.finder-search kbd{font:inherit;border:1px solid var(--finder-line);border-radius:6px;padding:0 8px;color:var(--finder-muted)}.finder-search button{border:0;background:none;font-size:1.5rem;color:var(--finder-muted)}
.finder-subjects{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:18px 0}.finder-subjects button{display:grid;grid-template-columns:44px 1fr;align-items:center;text-align:left;column-gap:12px;row-gap:2px;padding:15px;border:1px solid var(--finder-line);border-radius:14px;background:white;color:var(--finder-ink);min-width:0}.finder-subjects button svg,.all-icon{grid-row:span 2;width:40px;height:40px;color:var(--accent,#53677f)}.all-icon{font-size:2.5rem;line-height:1}.finder-subjects button>span:not(.all-icon){font-weight:750}.finder-subjects button small{font-size:.73rem;color:var(--finder-muted)}.finder-subjects button[aria-pressed=true]{border-color:var(--accent,#2563eb);box-shadow:0 0 0 1px var(--accent,#2563eb);background:var(--tint,#edf3ff)}
.finder-filters{display:flex;gap:16px;align-items:end;flex-wrap:wrap;margin:22px 0 15px}.finder-filters label{display:grid;gap:6px;color:var(--finder-muted);font-size:.78rem;font-weight:650}.finder-filters select{font-size:.9rem;padding:10px 32px 10px 12px;border:1px solid var(--finder-line);border-radius:10px;background:white;color:var(--finder-ink);max-width:100%;min-width:180px}.finder-filters button,.finder-heading button,.topic-shortcuts button{border:1px solid var(--finder-line);border-radius:9px;background:white;padding:10px 12px;color:var(--finder-muted);font-size:.85rem;min-height:40px}.topic-shortcuts{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px}.topic-shortcuts:empty{display:none}.topic-shortcuts button{border-radius:99px;padding:8px 12px;min-height:36px}.topic-shortcuts button[aria-pressed=true]{color:#174db2;background:#e8efff;border-color:#5a83d7}.finder-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:24px}.finder-heading h2{font-size:1.35rem;letter-spacing:-.025em;margin:0}.tool-finder #search-status{color:var(--finder-muted);font-size:.82rem;margin:8px 0 20px}.finder-results,.finder-group-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.finder-card{position:relative;display:block;text-decoration:none;background:white;border:1px solid var(--finder-line);border-radius:16px;padding:20px;min-width:0;transition:transform .15s,box-shadow .15s}.finder-card:hover{border-color:var(--accent,#65758a);transform:translateY(-2px);box-shadow:0 8px 20px #1429420b}.finder-symbol{display:grid;place-items:center;background:var(--tint,#eef2f6);color:var(--accent,#53677f);border-radius:12px;min-width:44px;width:max-content;max-width:100%;min-height:44px;font-size:1.2rem;font-weight:650;padding:4px 9px;margin-bottom:14px;overflow-wrap:anywhere}.finder-meta{color:var(--accent,#53677f);font-size:.7rem;font-weight:700}.finder-card h3{color:var(--finder-ink);font-size:1rem;line-height:1.3;margin:7px 0 8px;padding-right:10px}.finder-card p{color:var(--finder-muted);font-size:.8rem;line-height:1.5;margin:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.finder-arrow{position:absolute;right:18px;top:20px;font-size:1.2rem;color:var(--accent,#65758a)}.finder-group{grid-column:1/-1}.finder-group-title{font-size:1rem;margin:10px 0 14px;color:var(--finder-ink)}.finder-group-title span{display:inline-grid;place-items:center;min-width:24px;height:24px;border-radius:99px;background:#e5ebf3;color:#53677f;font-size:.72rem;margin-left:6px}.finder-empty{grid-column:1/-1;border:1px dashed #bccada;border-radius:16px;padding:32px;text-align:center;color:var(--finder-muted)}.finder-empty button{border:1px solid var(--finder-line);background:white;padding:10px;border-radius:8px;color:var(--finder-ink)}
.toolkit-refreshed main{padding-top:0}.toolkit-refreshed .header-inner nav{display:flex;gap:16px;align-items:center;flex-wrap:wrap}.open-tool-search{background:#eaf0fa;color:#1d4b90;border:1px solid #ccdaef;border-radius:9px;padding:8px 12px;min-height:40px;white-space:nowrap;font-size:.85rem}.toolkit-refreshed .tool-card p{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.toolkit-refreshed .education{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:24px}.learn-more{background:white;border:1px solid var(--finder-line);border-radius:14px;padding:0!important;min-width:0}.learn-more summary{padding:17px 20px;font-weight:700;cursor:pointer;color:var(--finder-ink)}.learn-more>div{padding:0 20px 20px}.learn-more table{width:100%;overflow-wrap:anywhere}.data-import{display:flex;flex-wrap:wrap;align-items:center;gap:9px;margin:4px 0 12px}.file-trigger{display:inline-flex!important;align-items:center;gap:6px;font-size:.76rem!important;background:#edf3ff;border:1px solid #c7d8f4;border-radius:8px;padding:8px;color:#234f96;cursor:pointer;margin:0!important}.file-trigger input[type=file]{font-size:.7rem!important;max-width:170px;border:0!important;padding:0!important;background:transparent!important;min-height:0!important}.header-option{display:inline-flex!important;align-items:center;gap:5px;font-size:.73rem!important;font-weight:500!important;margin:0!important}.header-option input{width:auto!important;min-height:0!important}.data-import>small{flex-basis:100%;color:var(--finder-muted);font-size:.73rem}.toolkit-refreshed .form-actions{flex-wrap:wrap}.toolkit-refreshed #clear-inputs{color:#53677f}.toolkit-refreshed .page-intro{padding-top:26px}
.search-dialog{border:1px solid #dce5ef;border-radius:20px;padding:24px;width:min(920px,calc(100% - 28px));max-height:85vh;background:var(--finder-bg);color:var(--finder-ink);overflow:auto}.search-dialog::backdrop{background:#14294290;backdrop-filter:blur(4px)}.dialog-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.dialog-top button{padding:8px 12px;border:1px solid var(--finder-line);border-radius:8px;background:white}.search-dialog>label{display:block;color:var(--finder-muted);font-size:.85rem;margin-bottom:8px}.search-dialog>input{width:100%;padding:14px;border:1px solid #bdccdc;border-radius:12px;background:white;box-sizing:border-box}.search-dialog>[role=status]{font-size:.85rem;color:var(--finder-muted)}.dialog-results{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.hub-refresh .hero{padding:42px 0 24px;text-align:left}.hub-refresh .hero h1{font-size:clamp(2.3rem,4.6vw,3.8rem);margin:0 0 12px;max-width:760px}.hub-refresh .hero .lede{margin:0;color:var(--finder-muted);font-size:1rem}.hub-refresh .hero-visual{display:flex;justify-content:space-between;align-items:center;gap:20px}.hub-refresh .hero-science{display:flex;gap:8px}.hub-refresh .hero-science span{width:72px;height:84px;border-radius:16px;background:var(--tint);display:grid;place-items:center}.hub-refresh .hero-science svg{width:54px;height:54px}.hub-refresh .subjects{display:none}.hub-refresh .support-details{border-top:1px solid var(--finder-line);margin-bottom:12px}.hub-refresh .support-details>summary{cursor:pointer;padding:20px 0;font-weight:700;font-size:1rem}.hub-refresh .support-details>section{width:100%;padding:10px 0 28px}.hub-refresh .about-project h2,.hub-refresh .feedback h2,.hub-refresh .updates h2{font-size:1.5rem}.hub-refresh .about-project p,.hub-refresh .feedback p,.hub-refresh .updates p{font-size:.9rem}.hub-refresh .hub-nav{gap:12px}
@media(max-width:900px){.finder-intro,.tool-finder{width:calc(100% - 32px)}.finder-results,.finder-group-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.finder-subjects{gap:8px}.finder-subjects button{grid-template-columns:1fr;padding:12px}.finder-subjects button svg,.all-icon{grid-row:auto;width:30px;height:30px}.all-icon{font-size:1.9rem}.hub-refresh .hero-science span{width:50px;height:64px}.hub-refresh .hero-science svg{width:40px;height:40px}}
@media(max-width:580px){.finder-intro{padding-top:24px}.finder-intro h1{font-size:2rem}.subject-drawing{width:70px;height:70px;flex-shrink:0}.subject-drawing svg{width:50px;height:50px}.finder-subjects{grid-template-columns:repeat(2,1fr)}.finder-subjects button{grid-template-columns:32px 1fr;padding:12px;column-gap:8px}.finder-subjects button svg,.all-icon{grid-row:span 2}.finder-subjects button small{font-size:.65rem}.finder-results,.finder-group-grid,.dialog-results{grid-template-columns:1fr}.finder-filters{gap:10px}.finder-filters label:first-child{width:100%}.finder-filters select{min-width:0;width:100%}.finder-card{padding:16px;display:grid;grid-template-columns:44px 1fr;column-gap:14px}.finder-symbol{grid-row:span 3;align-self:start;margin:0;font-size:1rem;max-width:44px;overflow-wrap:anywhere}.finder-meta,.finder-card h3,.finder-card p{grid-column:2}.finder-card h3{margin:4px 15px 5px 0;font-size:.94rem}.finder-card p{font-size:.75rem}.finder-arrow{right:14px;top:14px}.finder-heading h2{font-size:1.1rem}.finder-heading button{font-size:.75rem}.toolkit-refreshed .education{grid-template-columns:1fr}.toolkit-refreshed .header-inner{align-items:start;gap:10px}.toolkit-refreshed .header-inner nav{gap:8px;font-size:.76rem}.toolkit-refreshed .header-inner .brand{font-size:1rem}.hub-refresh .hero-science{display:none}.hub-refresh .nav{align-items:flex-start;padding:12px 0;gap:10px;flex-wrap:wrap}.hub-refresh .hub-nav{gap:12px;font-size:.8rem}.hub-refresh .hero{padding-top:26px}.hub-refresh .hero h1{font-size:2.25rem}.finder-search kbd{display:none}.search-dialog{padding:16px}.data-import{flex-direction:column;align-items:flex-start}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
/* Compact narrow screens without breaking formula badges into vertical text. */
.hub-refresh .tool-finder{width:100%}
@media(max-width:580px){
 .hub-refresh .hub-nav{width:100%;justify-content:flex-start;gap:8px 14px;overflow:visible;flex-wrap:wrap}
 .hub-refresh .hub-nav a{font-size:.75rem;flex-shrink:0}
 .hub-refresh .lang-toggle{font-size:.75rem;padding:6px 10px;min-width:0}
 .finder-subjects button{grid-template-columns:28px minmax(0,1fr);column-gap:6px;padding:11px 9px;text-align:left}
 .finder-subjects button>span:not(.all-icon){font-size:.85rem;overflow-wrap:normal}
 .finder-subjects button small{font-size:.62rem}
 .finder-subjects button svg,.all-icon{width:26px;height:26px}
 .finder-card{display:block;padding:16px}
 .finder-symbol{display:inline-flex;min-height:32px;min-width:32px;max-width:100%;width:max-content;white-space:normal;font-size:.85rem;line-height:1.3;padding:6px 9px;margin:0 0 10px;overflow-wrap:normal}
 .finder-meta{display:block;font-size:.66rem}
 .finder-card h3{margin:5px 12px 7px 0;font-size:1rem;padding-right:0}
 .finder-card p{font-size:.78rem;line-height:1.5}
}
/* Mathematical typography: local KaTeX fonts, screen-reader MathML and bounded scrolling. */
.math-typeset{font-weight:400;max-width:100%}.math-typeset .katex{font-size:1.05em}.math-block{display:block;max-width:100%;white-space:nowrap}.math-block .katex-display{margin:.55em 0;text-align:left}.math-block .katex-display>.katex{text-align:left}
.formula{max-width:100%;overflow-x:auto;overflow-y:hidden;padding:14px 16px!important;font-size:1rem!important;line-height:1.8;border-radius:10px;background:#f1f5fc;color:#142942;scrollbar-width:thin}.formula-note{white-space:normal;font-family:inherit!important}.formula .katex{font-size:1.1em}.learn-more>div{min-width:0}.learn-more .formula{margin:0 0 12px}.finder-symbol{max-width:100%;overflow-x:auto;overflow-y:hidden;white-space:nowrap}.finder-symbol .katex{font-size:1em}.tool-symbol .katex{font-size:.95em}
.working li,.answer,.example-answer,.metrics dd{max-width:100%;overflow-x:auto;overflow-y:hidden}.working li .math-typeset{display:inline-block;white-space:nowrap;margin:4px 0}.answer .math-typeset{font-size:.92em}.education table .math-typeset .katex{font-size:1em}
@media(max-width:580px){.formula{padding:12px!important;font-size:.92rem!important}.working li .katex{font-size:.93em}.finder-symbol{max-width:100%;padding:7px 10px;min-height:38px}.finder-symbol .katex{font-size:.93em}.tool-symbol{max-width:100%;overflow-x:auto}.answer{font-size:1.25rem}}
.math-typeset:not(.math-block){display:inline-block;max-width:100%;overflow-x:auto;overflow-y:hidden;vertical-align:middle;padding:2px 0}
.toolkit-refreshed .education{align-items:start}.working li .math-typeset{padding:5px 0}.working li .katex{font-size:1.05em!important}
.education table th:first-child{min-width:95px;white-space:nowrap;overflow-wrap:normal}.education table thead th{overflow-wrap:normal;word-break:normal}
/* v4: one navigation bar, compact discovery, and progressive calculation detail. */
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.open-tool-search{min-height:36px;padding:7px 11px}.v4 .hero{padding:30px 0 16px}.v4 .hero h1{font-size:clamp(2rem,4vw,3rem);line-height:1.15;max-width:790px}.v4 .hero-science span{width:56px;height:64px}.v4 .hero-science svg{width:44px;height:44px}.v4 .finder-search{margin-bottom:14px}.v4 .finder-subjects button{padding:12px 16px;min-height:70px}.v4 .finder-subjects small{font-size:.65rem}.v4 .finder-filters{margin:12px 0}.v4 .finder-heading{margin-top:16px}.v4 .finder-card{padding:16px;display:grid;grid-template-columns:46px minmax(0,1fr);column-gap:12px;align-content:start}.v4 .finder-symbol{grid-row:1/4;min-width:0;max-width:46px;width:46px;min-height:42px;padding:4px;font-size:.8rem;overflow:hidden;margin:0;align-self:start}.v4 .finder-meta,.v4 .finder-card h3,.v4 .finder-card p{grid-column:2}.v4 .finder-card h3{margin:3px 0 4px;font-size:.96rem;padding-right:8px}.v4 .finder-card p{-webkit-line-clamp:1;font-size:.75rem}.v4 .finder-arrow{top:auto;bottom:10px;right:10px;font-size:.8rem}.v4 #search-status{margin-bottom:16px}.v4-footer{display:flex;gap:20px;flex-wrap:wrap;justify-content:space-between;font-size:.8rem;padding:20px 0;color:#526276;border-top:1px solid #dbe4ee}.v4 .page-intro{padding-top:24px;margin-bottom:14px}.v4 .page-intro h1{font-size:clamp(1.85rem,3.8vw,2.8rem);line-height:1.18}.v4 .page-intro .lede{font-size:.98rem;margin:10px 0;line-height:1.55}.v4 .breadcrumbs{margin:14px 0 8px;font-size:.8rem}.page-shortcuts{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 20px}.page-shortcuts a{border:1px solid #cfdae7;border-radius:8px;background:white;padding:7px 11px;font-size:.78rem;text-decoration:none;color:#2b537c}.v4 .input-panel,.v4 .output-panel{padding:22px;min-width:0}.v4 .calculator-layout{align-items:start;grid-template-columns:minmax(0,.85fr) minmax(0,1.35fr);gap:20px}.v4 .input-panel h2,.v4 .output-panel 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/* v4.4 experimental data import */
#data-import{display:block;margin:0 0 1.3rem;border:1px solid #bdd5e2;border-radius:12px;background:#f4f9fc;min-width:0;}
#data-import>summary{padding:1rem;font-weight:700;cursor:pointer;color:#16465e;}
.import-body{padding:0 1rem 1rem;display:grid;gap:.85rem;min-width:0;}
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.import-preview table{border-collapse:collapse;width:100%;font-size:.83rem;}
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.import-preview thead{background:#e6f0f5;}
.import-hint,#import-counts{color:#435d6e;font-size:.84rem!important;}
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.import-actions{display:flex;gap:.6rem;flex-wrap:wrap;margin:.85rem 0;}
#import-status{color:#165c71;}
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.import-file-control{display:grid;gap:.4rem;min-width:0;}.import-file-control>span{font-size:.82rem;overflow-wrap:anywhere;color:#435d6e;}

/* Official paper resources */
.paper-shortcut{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:1.1rem 1.3rem;margin:1.5rem 0;border:1px solid #ccdce8;border-radius:12px;background:#f2f7fb;}
.paper-shortcut p{margin:.35rem 0 0;font-size:.88rem;color:#456076;}
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.papers-page{max-width:1100px;padding-top:2rem!important;}.papers-page>h1{margin-top:.6rem;}.papers-page>p{max-width:780px;line-height:1.7;}
.paper-jumps{display:flex;flex-wrap:wrap;gap:.55rem;margin:1.2rem 0 2rem;}.paper-jumps a{padding:.5rem .85rem;border-radius:30px;background:#eef4f9;border:1px solid #cddce8;text-decoration:none;}
.paper-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;margin:1.2rem 0;}
.paper-card{display:flex;flex-direction:column;align-items:flex-start;padding:1.3rem;border:1px solid #d6e1eb;border-radius:14px;background:white;min-width:0;scroll-margin-top:140px;}.paper-card h3{font-size:1.08rem;margin:.9rem 0 .65rem;overflow-wrap:anywhere;}.paper-card p{font-size:.92rem;line-height:1.65;color:#405c72;}.paper-card>a{line-height:1.5;min-height:32px;overflow-wrap:anywhere;}.paper-card .paper-tools{margin-top:.5rem;font-size:.85rem;}.paper-tags{display:flex;gap:.4rem;flex-wrap:wrap;}.paper-tags span{font-size:.7rem;background:#eef5fa;border-radius:5px;padding:.25rem .45rem;}.paper-access{margin-top:2.5rem;}.paper-guidance{border:1px solid #d6e1eb;border-radius:12px;padding:1rem;margin-top:1.8rem;background:white;}.paper-guidance summary{font-weight:700;cursor:pointer;}.paper-guidance li{padding:.4rem 0;line-height:1.7;}.paper-checked{font-size:.8rem;color:#596e80;margin-top:1.1rem;}
html[lang=de] .v4-header-inner nav{flex-wrap:wrap;}html[lang=de] .download-buttons button{overflow-wrap:anywhere;}
@media(max-width:650px){.paper-grid{grid-template-columns:minmax(0,1fr);}.paper-shortcut{align-items:flex-start;flex-direction:column;}.paper-shortcut .button{width:100%;}.paper-card{padding:1rem;}.paper-jumps a{font-size:.82rem;}.papers-page>h1{font-size:1.9rem;overflow-wrap:anywhere;}}

@media(min-width:601px) and (max-width:1050px){.v4-header-inner{flex-wrap:wrap;}.v4-header nav{flex:1 1 100%;flex-wrap:wrap;justify-content:flex-start;min-width:0;}}