@charset "UTF-8";
/* The original 960px Fizyka.dk portal, refreshed for modern screens. */
:root{font-family:Tahoma,Arial,sans-serif;font-size:13px;color:#111;background:#eaeaea;--blue:#134e8b;--line:#dedede;--muted:#717171;font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:12px}body{margin:0;background:#eaeaea url('../images/original/bg.jpg') repeat-x top;line-height:20px}a{color:#134e8b;text-decoration:none}a:hover{color:#093460;text-decoration:underline}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #b284be;outline-offset:3px}button,input{font:inherit}button{cursor:pointer}img{max-width:100%;height:auto}h1,h2,h3,h4{color:#134e8b;line-height:1.25;margin:0 0 10px}h1{font-size:28px;font-weight:400}h2{font-size:20px}h3{font-size:16px}p{margin:0 0 10px}ul{margin:8px 0;padding-left:22px}.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;top:-80px;left:12px;background:#fff;padding:10px 16px;z-index:20;border:2px solid #134e8b}.skip-link:focus{top:8px}.site-wrap{width:min(960px,100% - 24px);margin:0 auto}.preview-bar{height:20px;text-align:right;font-size:10px;line-height:20px;color:#555}.preview-bar span{color:#777}
.masthead{height:120px;position:relative;background:#246ca1 url('../images/original/header.png') no-repeat center top;border-bottom:1px solid #3076a6}.brand{position:absolute;left:30px;top:16px;width:668px;aspect-ratio:668/95;line-height:0}.brand>img{display:block;width:92%;height:auto}.brand-version{position:absolute;left:89.6%;top:10%;width:9.6%;line-height:0}.brand-version img{display:block;width:100%;height:auto}.search-form{position:absolute;right:20px;top:51px;display:flex;align-items:center;gap:5px;width:218px}.search-form input{width:160px;min-width:0;height:23px;border:1px solid #d4d4d4;background:#fff;color:#222;padding:2px 6px;font-size:11px}.search-form button,.button{border:1px solid #0a3562;background:#124f88 url('../images/original/button.png') repeat-x left top;color:#f2f6fa;padding:2px 6px;line-height:17px;font-size:11px;white-space:nowrap}.button{display:inline-block}.button:hover{color:#fff;background-color:#0d4279}.main-nav{display:flex;align-items:stretch;min-height:33px;background:#393939 url('../images/original/nav.jpg') repeat-x left top;border-bottom:1px solid #242424;flex-wrap:wrap}.main-nav>a{color:#fff;font-size:12px;line-height:33px;padding:0 12px;border-right:1px solid #2b2b2b;white-space:nowrap}.main-nav>a:hover,.main-nav>a.active{color:#fff;text-decoration:none;background:#555 url('../images/original/nav-a.jpg') repeat-x left top}.main-nav .elite-link{margin-left:auto;background:#b284be;color:#1d1123;font-size:11px;font-weight:bold;border:0}.main-nav .elite-link:hover,.main-nav .elite-link.active{background:#976aab;color:#fff}
.portal-surface{background:#fff;padding:5px 5px 0;box-shadow:0 4px 12px #00000017}.portal-breadcrumb{font-size:11px;color:#555;padding:3px 10px 8px}.portal-columns{display:grid;grid-template-columns:175px minmax(0,600px) 175px;align-items:start}.portal-main{min-width:0;padding:5px 10px 18px;overflow-wrap:anywhere}.left-sidebar,.right-sidebar{min-width:0}.shell{width:100%;margin:0}.sidebar-navigation>summary{display:none}.module{padding:5px;margin:0 0 8px}.module>h2{height:33px;margin:0 0 5px;padding:0 10px;border:1px solid #0d4988;line-height:31px;background:#0d4279 url('../images/original/h3.png') repeat-x left top;color:#fff;font-size:16px;font-weight:400;white-space:nowrap}.module-content{padding:4px 5px;overflow-wrap:anywhere}.module-content p{margin:0 0 8px}.module-menu{list-style:none;padding:0 5px;margin:0}.module-menu li{border-bottom:1px solid #e4e4e4;margin:0}.module-menu li:last-child{border-bottom:0}.module-menu a{display:block;padding:4px 0 4px 23px;line-height:19px;color:#141414;font-weight:bold;background:url('../images/original/arrow2.gif') no-repeat left 8px;overflow-wrap:anywhere}.module-menu a:hover{color:#093460}.module-menu .elite-menu-link{color:#67357e;font-size:11px}.recent-menu a{font-size:12px;font-weight:400;padding-block:5px;background-position:left 8px}.topic-links{display:flex;flex-wrap:wrap;align-items:baseline;gap:3px 8px;line-height:21px}.topic-links a:nth-child(3n){font-size:15px}.topic-links a:nth-child(4n){color:#6f3e85}.archive-module .module-content{font-size:12px}
.welcome-panel{border:1px solid #cddbe7;background:linear-gradient(#f7fbfe,#edf3f7);padding:13px 14px;margin:0 0 19px}.welcome-panel h1{font-size:20px;font-weight:bold;margin-bottom:7px}.welcome-panel h2{font-size:14px;margin-bottom:8px}.welcome-panel p{margin-bottom:8px}.welcome-panel p:last-child{margin-bottom:0}.welcome-panel ul{padding-left:20px;margin:7px 0 10px}.welcome-panel a{font-weight:bold}.catalog-notice{font-size:11px;color:#6d6d6d;line-height:17px;margin:0 0 14px}.catalog-notice>span{margin-right:4px}.article-grid{display:block}.article-card{padding:12px 0 19px;border-bottom:1px dotted #bcbcbc;margin-bottom:15px;display:flow-root}.article-date{font-size:11px;color:#777;margin:0 0 3px}.article-card h3{font-size:24px;line-height:1.13;font-weight:400;margin:0 0 6px}.article-author{font-size:12px;color:#555;margin-bottom:12px}.article-author span{color:#134e8b}.article-description{margin:6px 0 14px;line-height:21px}.archive-card-image{display:block;float:left;max-width:42%;margin:3px 14px 9px 0}.archive-card-image img{max-height:190px;width:auto;max-width:100%;object-fit:contain;padding:3px;border:1px solid #ddd;background:#fff}.article-bottom{clear:both;display:flex;align-items:baseline;justify-content:space-between;flex-wrap:wrap;gap:6px 12px;font-size:11px;line-height:18px;color:#666}.article-bottom>span{min-width:0}.readmore{white-space:nowrap;font-size:12px}.more-publications{text-align:right;margin:15px 0 5px}.text-link{font-weight:bold}.back-link{display:inline-block;margin:20px 0 5px;font-size:12px}
.page-heading{padding:2px 0 12px}.breadcrumbs{display:flex;flex-wrap:wrap;gap:6px;font-size:11px;color:#666;margin:0 0 17px;line-height:18px}.breadcrumbs>span{color:#777}.page-heading h1{margin:7px 0 10px;font-size:30px;font-weight:400}.heading-symbol{font-family:Georgia,serif;font-size:23px;color:#9a78aa;padding-left:10px}.eyebrow{font-size:10px;line-height:16px;color:#777;letter-spacing:.035em}.page-heading>p{line-height:21px}.results-section{padding-bottom:20px}.empty-state{padding:25px 15px;background:#f5f8fa;border:1px solid #dce4eb;text-align:center;margin:10px 0 30px}.empty-state>span{font-size:30px;color:#805394}.empty-state h1,.empty-state h2{font-size:24px;margin:12px 0}.empty-state p{margin-bottom:18px}.reading-page{padding:2px 0 20px;min-width:0}.reading-page>h1{font-size:34px;font-weight:400;line-height:1.15;margin:7px 0 16px}.reading-lead{font-weight:bold;line-height:21px}.author-line{display:flex;align-items:center;gap:10px;border-block:1px solid #ddd;padding:9px 0;margin:15px 0}.author-avatar{display:none}.author-line strong{font-size:12px;font-weight:normal;color:#134e8b}.author-line div{min-width:0}.author-line div>span{display:block;font-size:11px;line-height:18px;color:#777}.author-line strong{overflow-wrap:anywhere}.reading-formula{padding:20px 10px;border:1px solid #d9e1e9;background:#f4f8fc;font-family:Georgia,serif;font-size:32px;text-align:center;color:#134e8b;overflow:auto}.reading-body{margin:20px 0;font-size:14px;line-height:23px}.reading-page aside.catalog-notice{padding:8px 10px;border-left:3px solid #b284be;background:#f7f5fa}
.team-list{margin-bottom:25px}.team-profile{display:grid;grid-template-columns:105px minmax(0,1fr);gap:14px;padding:18px 0;border-top:1px dotted #bcbcbc}.team-portrait{display:block;width:105px;height:105px;object-fit:cover;object-position:center top;padding:3px;border:1px solid #d4d4d4;background:#fff}.team-profile h2{font-size:21px;font-weight:400;margin-bottom:5px}.team-role{font-weight:bold;font-size:12px;color:#555;margin-bottom:9px}.team-profile p{line-height:21px}.team-links{display:flex;flex-wrap:wrap;gap:4px 15px;list-style:none;padding:0;margin:9px 0;font-size:12px}.review-note{font-size:11px;line-height:17px!important;background:#faf8ef;border-left:2px solid #c8b683;padding:6px 8px;color:#756b4b;margin-top:10px}
.portal-bottom-note{text-align:center;font-size:11px;color:#777;padding:13px 10px;border-top:1px solid #ededed}.footer-lists{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;padding:22px 15px 20px}.footer-lists h2{font-size:20px;font-weight:400;color:#333}.footer-lists ul{list-style:none;padding:0;margin:0;font-size:12px;line-height:21px}.footer-lists a{color:#1767a7}.site-footer{border-radius:6px;background:#1a528c url('../images/original/mods3.png') repeat-x left top;color:#fff;padding:18px 18px 22px}.footer-columns{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px}.footer-columns h2{font-size:20px;font-weight:400;color:#fff;margin:2px 0 10px}.footer-columns a{display:block;padding:3px 0 3px 15px;border-bottom:1px dotted #083969;background:url('../images/original/arrow.png') no-repeat left 8px;color:#bcddff;font-size:12px;line-height:20px}.copyright{display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap;padding:10px 0 18px;font-size:11px;color:#555}
/* Safe archive reading layout: contain original media, tables and mathematics. */
.archive-categories{display:flex;flex-wrap:wrap;gap:5px 14px;margin:0 0 20px;padding:8px 10px;border-block:1px solid #dce3e9;background:#f5f8fb}.archive-categories a{font-size:12px;line-height:21px}.archive-categories a>span{padding-left:3px}.archive-heading{font-size:20px;margin:20px 0 12px}.archive-page-list{padding-left:20px;line-height:2;margin-bottom:25px}.legacy-content{color:#171717;font-size:14px;line-height:1.65;overflow-wrap:anywhere;margin:20px 0;min-width:0}.legacy-content p{color:inherit;margin:.7em 0}.legacy-content img{max-width:100%;height:auto;vertical-align:middle}.legacy-content h1,.legacy-content h2,.legacy-content h3,.legacy-content h4{line-height:1.35;margin:1.2em 0 .6em;letter-spacing:normal}.legacy-content h1{font-size:26px}.legacy-content h2{font-size:22px}.legacy-content h3{font-size:18px}.legacy-content table{display:block;max-width:100%;overflow-x:auto;border-collapse:collapse;margin:15px 0}.legacy-content td,.legacy-content th{padding:6px 9px;border:1px solid #dce3ef}.legacy-content a{color:#134e8b;text-decoration:underline;text-underline-offset:2px}.legacy-content blockquote{border-left:3px solid #9d83bd;margin:18px 0;padding:3px 15px}.legacy-content pre{overflow:auto;max-width:100%;white-space:pre-wrap}.legacy-math{display:inline-block;max-width:100%;overflow-x:auto;vertical-align:middle;padding:2px 1px;overflow-wrap:normal}.math-fallback{font-family:Consolas,monospace;font-size:13px;color:#745323;background:#fff7e8;border:1px solid #e9dabd;white-space:pre-wrap}.media-unavailable,.legacy-embed-notice{display:inline-block;max-width:100%;padding:8px 10px;background:#f4f4f7;color:#6f7685;border:1px dashed #b9c1cf;font-size:12px;margin:6px 0}.archive-source{display:flex;flex-wrap:wrap;gap:8px 15px;border-top:1px solid #ddd;padding-top:12px;margin-top:20px;font-size:11px}.article-bottom span:first-child,.article-card h3{overflow-wrap:anywhere}
@media(max-width:980px){.portal-columns{grid-template-columns:165px minmax(0,1fr) 165px}.brand{left:18px;width:60%;top:23px}.search-form{right:15px;width:205px}.search-form input{width:147px}.main-nav>a{padding-inline:10px}.module>h2{font-size:15px;padding-left:8px}.portal-main{padding-inline:9px}.article-card h3{font-size:23px}}
@media(max-width:760px){.site-wrap{width:min(600px,100% - 16px)}.preview-bar{height:20px}.masthead{height:148px;background-size:auto 148px}.brand{left:50%;top:5px;transform:translateX(-50%);width:min(94%,540px)}.search-form{left:15px;right:15px;top:auto;bottom:12px;width:auto}.search-form input{flex:1;width:auto;height:29px;font-size:12px}.search-form button{height:29px;padding-inline:14px;font-size:12px}.main-nav{justify-content:flex-start;background-color:#393939;background-size:auto 38px}.main-nav>a{font-size:12px;line-height:37px;flex:1 0 auto;text-align:center;padding-inline:10px;border-bottom:1px solid #262626}.main-nav .elite-link{margin-left:0;flex-grow:1;font-size:11px}.portal-surface{padding-inline:5px}.portal-columns{display:flex;flex-direction:column}.portal-main{order:0;width:100%;padding:5px 8px 18px}.left-sidebar{order:1;width:100%;border-top:1px solid #ddd;padding-top:5px}.right-sidebar{order:2;width:100%;display:grid;grid-template-columns:1fr 1fr;border-top:1px solid #ddd;padding-top:5px}.sidebar-navigation>summary{display:block;cursor:pointer;background:#edf2f6;color:#134e8b;font-weight:bold;padding:9px 10px;margin:0 5px 6px}.sidebar-navigation>summary:after{content:' −';float:right}.sidebar-navigation:not([open])>summary:after{content:' +';float:right}.sidebar-modules{display:grid;grid-template-columns:1fr 1fr}.sidebar-navigation:not([open]) .sidebar-modules{display:none}.module-menu a{font-size:12px;padding-block:5px}.module>h2{white-space:normal}.welcome-panel{padding:12px}.welcome-panel h1{font-size:22px}.article-card h3{font-size:25px}.article-description{font-size:14px;line-height:22px}.page-heading h1{font-size:28px}.reading-page>h1{font-size:30px}.legacy-content{font-size:14px}.footer-lists{gap:18px;grid-template-columns:1fr 1fr;padding-inline:10px}.footer-lists section:first-child{grid-column:1/-1}.footer-columns{grid-template-columns:1fr 1fr;gap:22px}.footer-lists h2,.footer-columns h2{font-size:19px}.copyright{font-size:10px;gap:5px;padding-inline:5px}}
@media(max-width:390px){.masthead{height:126px}.brand{top:6px}.main-nav>a{font-size:11px;padding-inline:9px}.portal-main{padding-inline:5px}.welcome-panel{padding:10px}.welcome-panel h2{font-size:13px}.team-profile{grid-template-columns:76px minmax(0,1fr);gap:10px}.team-portrait{width:76px;height:76px}.team-profile h2{font-size:19px}.right-sidebar{grid-template-columns:1fr}.sidebar-modules{gap:0}.module-menu{padding-inline:2px}.module-menu a{padding-left:18px;font-size:11px}.module>h2{font-size:14px;padding-left:7px}.archive-card-image{max-width:45%;margin-right:10px}.article-bottom{display:block}.readmore{display:inline-block;margin-top:7px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
/* Preserve the original menu order and compact portal modules, including keyboard-operated submenus. */
.main-nav .nav-item{display:flex;align-items:stretch;position:relative;border-right:1px solid #292929}.main-nav .nav-item>a{display:block;color:#fff;font-size:11px;line-height:33px;padding:0 10px;white-space:nowrap}.main-nav .nav-item>a:hover,.main-nav .nav-item>a.active{background:#555 url('../images/original/nav-a.jpg') repeat-x left top;text-decoration:none}.main-nav .nav-item.elite-link{margin-left:0;background:#b284be}.main-nav .nav-item.elite-link>a{font-size:10px}.nav-submenu{position:relative}.nav-submenu>summary{color:#fff;cursor:pointer;list-style:none;line-height:33px;padding:0 5px}.nav-submenu>summary::-webkit-details-marker{display:none}.nav-submenu>summary:focus-visible{outline:2px solid #d9b1e7;outline-offset:-2px}.nav-submenu>ul{position:absolute;z-index:20;top:100%;left:0;min-width:230px;max-width:80vw;padding:4px 0;margin:0;list-style:none;background:#f7f7f7;border:1px solid #b8c9d9;box-shadow:0 4px 8px #0003}.nav-submenu li>a{display:block;color:#134e8b;padding:8px 12px;border-bottom:1px solid #ddd;font-size:12px;line-height:17px}.nav-submenu li>a:hover{background:#e7eff7}.nav-item:has(.nav-submenu)>a{padding-right:3px}.module-menu .elite-menu-link{background-color:#b284be;color:#17121c}.module-menu a[aria-current=page]{color:#134e8b;background-color:#edf4fa}.welcome-panel{background:linear-gradient(#f5f8fc,#fff);margin-bottom:15px}.welcome-panel h1{font-size:20px;line-height:1.3;color:#134e8b;padding-bottom:7px;border-bottom:1px solid #dce4ed}.welcome-panel h2{color:#134e8b;font-size:14px}.article-card{position:relative}.featured-label{float:right;display:block;margin-left:8px;font-size:10px;line-height:16px;color:#fff;background:#a82042;padding:1px 7px}.article-intro{font-size:13px;line-height:1.6;margin:10px 0 15px}.article-intro img{max-height:240px;width:auto}.article-intro h1,.article-intro h2,.article-intro h3{font-size:20px}.topic-links .tag-size-1{font-size:11px}.topic-links .tag-size-2{font-size:14px}.topic-links .tag-size-3{font-size:21px}.topic-links .tag-size-4{font-size:29px;line-height:1.15}.footer-columns{grid-template-columns:repeat(3,minmax(0,1fr))}.footer-context{font-size:10px;color:#d5e3f1;line-height:16px;margin:14px 0 0}.elite-section .portal-main>.page-heading{border-top:4px solid #a37bb6;background:linear-gradient(#f5eef8,#fff);padding:12px}.elite-section .page-heading h1,.elite-section .reading-page>h1{color:#69407f}.elite-section .category-intro{border-left:3px solid #b284be;padding-left:12px}.elite-challenge{border:1px solid #aa87bb;background:#f8f3fb;margin:16px 0;padding:12px}.elite-challenge legend{color:#69407f;font-weight:bold}.contact-directory{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:22px 0}.contact-directory section{padding:12px;border:1px solid #d4dfe9;background:#f7f9fc}.contact-directory h2{font-size:17px;margin-bottom:8px}.contact-directory p{font-size:12px}.contact-trap{position:absolute;left:-10000px;width:1px;height:1px;overflow:hidden}.contact-message{padding:16px 0;border-bottom:1px dotted #ccc}.contact-message h2{font-size:20px}.plain-message{white-space:pre-wrap;overflow-wrap:anywhere;margin:12px 0}
@media(max-width:760px){.main-nav .nav-item{flex:1 0 auto}.main-nav .nav-item>a{flex:1;text-align:center;line-height:38px;font-size:12px;padding-inline:9px}.nav-submenu>summary{line-height:38px;padding-inline:8px}.nav-submenu>ul{left:auto;right:0}.welcome-panel h1{font-size:22px}.footer-columns{grid-template-columns:1fr}.footer-lists{grid-template-columns:1fr}.footer-lists section:first-child{grid-column:auto}.contact-directory{grid-template-columns:1fr}.article-intro{font-size:14px;line-height:1.65}.topic-links .tag-size-4{font-size:25px}}
.media-attribution{margin-top:24px;padding:14px;border:1px solid #dce3eb;background:#f7f9fb;font-size:12px;line-height:1.65;overflow-wrap:anywhere}
.media-attribution h2{font-size:16px;margin:0 0 8px}.media-attribution ul{margin:0;padding-left:18px}.media-attribution li+li{margin-top:8px}.media-attribution a{text-decoration:underline;text-underline-offset:2px}

/* Source portal listing, tutoring and footer placement. */
.category-children section{margin:12px 0 20px;padding-bottom:12px;border-bottom:1px dotted #bcbcbc}.category-children h2{font-size:22px;font-weight:400}.category-children .legacy-content{margin-bottom:8px}.category-more{margin:18px 0}.category-more h2{font-size:18px}.article-list-tags{display:flex;flex-wrap:wrap;gap:3px 8px;font-size:11px;clear:both;margin:7px 0}.footer-columns{grid-template-columns:repeat(4,minmax(0,1fr))}.footer-archive a{font-size:11px;line-height:19px}@media(max-width:760px){.footer-columns{grid-template-columns:1fr 1fr}}@media(max-width:390px){.footer-columns{grid-template-columns:1fr}}

/* Account forms use the same compact portal controls, including the original sidebar sign-in. */
.community-form{display:grid;gap:7px;max-width:100%;margin:12px 0 20px}.community-form>label{font-weight:bold}.community-form>input:not([type=hidden]):not([type=checkbox]),.community-form>textarea{width:100%;min-width:0;border:1px solid #b8c9d9;background:#fff;color:#111;padding:6px;font:inherit}.community-form>textarea{resize:vertical}.community-form button,.reader-sidebar-login button,.reader-logout button{justify-self:start;border:1px solid #0a3562;background:#124f88 url('../images/original/button.png') repeat-x left top;color:#fff;padding:5px 9px;font:inherit}.community-form>label:has(input[type=checkbox]){font-weight:normal}.reader-sidebar-login{display:grid;gap:4px;margin-bottom:10px}.reader-sidebar-login>input:not([type=hidden]){width:100%;min-width:0;border:1px solid #b8c9d9;padding:3px;font:inherit}.reader-sidebar-login>label{font-size:11px}.reader-remember{line-height:17px;display:flex;align-items:flex-start;gap:4px}.reader-remember input{flex:none;margin:2px 0 0}.reader-sidebar-login button,.reader-logout button{padding:3px 7px;font-size:11px}.reader-recovery-links{font-size:11px;line-height:18px}.reader-greeting{overflow-wrap:anywhere}.right-sidebar .module-content:has(.reader-sidebar-login){padding-inline:2px}.reader-sidebar-login .community-challenge{max-width:100%;overflow:auto}.validation-summary-errors{color:#9b2335}.validation-summary-valid{display:none}
.recovered-video video { max-width: 100%; height: auto; }

/* A background challenge needs no banner space; interactive frames retain
   Cloudflare's native dimensions and align with the surrounding form fields. */
.community-challenge { min-width: 0; max-width: 100%; }
.community-challenge .cf-turnstile { line-height: 0; }
.community-challenge noscript { line-height: 1.5; }