:root{--ink:#171717;--muted:#676767;--paper:#fdfdfc;--line:#dedede;--orange:#f26b21;--green:#31835c;--blue:#286fa8;--violet:#9a3f83;--yellow:#b98600;--red:#b9433c;--accent:var(--orange);--sans:Arial,Helvetica,sans-serif;--page:1220px}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.5 var(--sans)}a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}a:focus-visible{outline:3px solid var(--orange);outline-offset:3px}img{display:block;max-width:100%;height:auto}.topline{height:6px;background:var(--orange)}.shell{width:min(calc(100% - 40px),var(--page));margin:auto}.site-header{height:104px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:32px}.brand{display:flex;align-items:center;gap:12px}.brand-name{font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;font-size:2rem;line-height:1;font-weight:850;letter-spacing:-.08em}.brand-extension{color:var(--orange)}.brand img{width:62px;height:62px;object-fit:contain}.site-header 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.excerpt{-webkit-line-clamp:4;line-clamp:4}.read{color:var(--accent);font-weight:800}.category-sections{margin-top:54px}.category-section:nth-child(6n+1){--accent:var(--orange)}.category-section:nth-child(6n+2){--accent:var(--green)}.category-section:nth-child(6n+3){--accent:var(--blue)}.category-section:nth-child(6n+4){--accent:var(--violet)}.category-section:nth-child(6n+5){--accent:var(--yellow)}.category-section:nth-child(6n+6){--accent:var(--red)}.category-section,.stream-section{margin:0 0 48px}.category-description{max-width:720px;color:var(--muted)}.category-cards,.latest-list{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.page-title{border-bottom:1px solid var(--line)}.category-streams{padding-top:34px}.stream-section{--stream-accent:var(--orange)}.stream-section .section-head{border-color:var(--stream-accent)}.stream-section .article-card{border-top:4px solid var(--stream-accent)}.stream-section:nth-child(6n+1){--stream-accent:var(--orange)}.stream-section:nth-child(6n+2){--stream-accent:var(--green)}.stream-section:nth-child(6n+3){--stream-accent:var(--blue)}.stream-section:nth-child(6n+4){--stream-accent:var(--violet)}.stream-section:nth-child(6n+5){--stream-accent:var(--yellow)}.stream-section:nth-child(6n+6){--stream-accent:var(--red)}.series-group{margin-top:28px}.breadcrumbs{margin:22px 0;color:var(--muted);font-size:.78rem}.breadcrumbs ol{display:flex;gap:8px;list-style:none;padding:0}.breadcrumbs li+li:before{content:"/";margin-right:8px}.article-layout{display:grid;grid-template-columns:minmax(0,780px) 300px;gap:64px}.article-head{border-bottom:1px solid var(--line);padding-bottom:24px}.article-head h1{font-size:clamp(2.3rem,5vw,4.5rem);line-height:1.04;margin:.3rem 0}.article-lead{font-size:1.15rem;color:#454545}.article-meta{display:flex;gap:18px;color:var(--muted);font-size:.8rem}.article-hero{margin:28px 0}.article-hero img,.article-body figure img{width:100%;border-radius:0}.article-body{font-family:inherit;font-size:1.08rem;line-height:1.75;text-align:justify}.article-body h2{font-size:1.75rem;line-height:1.2;margin:1.7em 0 .6em}.article-body p{margin:0 0 1.3em}.related{position:sticky;top:24px;height:max-content;border-left:4px solid var(--orange);padding-left:20px}.related h2{font-size:1.2rem}.related a{display:block;border-top:1px solid var(--line);padding:14px 0;font-weight:750}.related a span{display:block;color:var(--accent);font-size:.68rem;text-transform:uppercase;letter-spacing:.1em}.accent-biologia{--accent:var(--green)}.accent-technologia{--accent:var(--blue)}.accent-chemia-i-materialy{--accent:var(--violet)}.accent-fizyka{--accent:var(--yellow)}.accent-historia-i-geografia{--accent:var(--red)}.accent-spoleczenstwo{--accent:var(--orange)}.empty-state{padding:28px;border:1px solid var(--line);color:var(--muted)}footer{margin-top:70px;padding:22px 0;border-top:1px solid var(--line);display:flex;justify-content:space-between;color:var(--muted);font-size:.78rem}
@media(max-width:900px){.site-header{height:auto;padding:16px 0;align-items:flex-start;flex-direction:column}.site-header nav{width:100%;height:42px}.latest-top,.article-layout{grid-template-columns:1fr}.horizontal-card{grid-template-columns:minmax(180px,34%) minmax(0,1fr)}.related{position:static;margin-top:10px}.category-cards{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.shell{width:min(calc(100% - 28px),var(--page))}.latest-small-cards,.category-cards,.latest-list{grid-template-columns:1fr}.horizontal-card{grid-template-columns:1fr}.horizontal-card .card-media{height:190px;min-height:0}.featured-media{height:240px}.brand img{width:48px;height:48px}.brand-name{font-size:1.55rem}.article-body{font-size:1rem}footer{display:block}footer span{display:block;margin-top:6px}}
.math-display { overflow-x: auto; overflow-y: hidden; max-width: 100%; padding-block: .35rem; }
math { font-size: 1.05em; }
.footer-links{display:flex;flex-wrap:wrap;gap:16px}.information-page{max-width:760px}.information-page p{line-height:1.7}.information-page h2{margin-top:2rem}@media(max-width:620px){.footer-links{margin:12px 0}}
