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.seo-toc strong{font:900 .7rem var(--pixel);letter-spacing:.06em;color:var(--blue);margin-right:.25rem}
.seo-toc a{font:900 .72rem var(--pixel);color:var(--line);text-decoration:underline;text-underline-offset:.15em}
.seo-toc a:hover,.seo-toc a:focus-visible{color:var(--blue);background:#fff1ad}
@media(max-width:640px){.seo-toc{display:grid;grid-template-columns:1fr 1fr;gap:.5rem .7rem}.seo-toc strong{grid-column:1/-1}}

.formula-poster{max-width:760px;margin:0 auto 1.5rem;padding:clamp(.65rem,2vw,1rem);background:var(--paper);border:3px solid var(--line);box-shadow:var(--shadow);text-align:center}
.formula-poster img{display:block;width:100%;height:auto;margin:0 auto}
.formula-poster figcaption{margin-top:.65rem;color:var(--muted);font:700 .68rem var(--pixel);letter-spacing:.03em}

/* The rules overview is the quickest reference on the Potenzgesetze page. */
.formula-sheet{background:var(--paper);border:3px solid var(--line);box-shadow:var(--shadow);padding:clamp(1rem,3vw,1.6rem);margin:0 0 1.5rem;scroll-margin-top:76px}
.formula-sheet-head{display:flex;align-items:flex-start;justify-content:space-between;gap:1.2rem;border-bottom:2px solid var(--line);padding-bottom:1rem;margin-bottom:1rem}
.formula-sheet-head h2{font:900 clamp(1.55rem,3.8vw,2.55rem)/1.02 Georgia,serif;margin:.35rem 0 .5rem}
.formula-sheet-head p{max-width:760px;margin:0;color:var(--muted)}
.formula-sheet .formula-table-wrap{margin:0}
.formula-sheet .formula-table{width:100%;min-width:0;table-layout:fixed}
.formula-sheet .formula-table caption{caption-side:top;text-align:left;padding:.7rem .75rem;background:#eef7ed;color:var(--muted);font:700 .72rem var(--pixel);letter-spacing:.04em}
.formula-sheet .formula-table th:first-child{width:38%}
.formula-sheet .formula-table th,.formula-sheet .formula-table td{overflow-wrap:anywhere}
.formula-sheet .formula-table .math-cell{font-size:clamp(.72rem,2.2vw,1.08rem);line-height:1.2;white-space:normal;overflow-wrap:anywhere}
.formula-actions{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:.55rem;flex:0 0 auto}
.formula-layout-toggle,.formula-focus-toggle{border:2px outset #fff;background:var(--green);color:#fff;padding:.65rem .75rem;cursor:pointer;text-align:center;font:900 .72rem var(--pixel);white-space:nowrap}
.formula-layout-toggle{display:none}
body.formula-focus-mode .formula-layout-toggle{display:inline-block}
.formula-layout-toggle:hover,.formula-layout-toggle:focus-visible,.formula-focus-toggle:hover,.formula-focus-toggle:focus-visible{background:var(--orange);color:var(--ink);outline:2px solid var(--line);outline-offset:2px}
.formula-focus-toggle[aria-pressed="true"]{background:var(--mint);color:var(--ink)}
body.formula-focus-mode{background:var(--green);overflow:hidden}
body.formula-focus-mode .top,body.formula-focus-mode .shell>aside,body.formula-focus-mode .mobile-nav,body.formula-focus-mode .breadcrumb,body.formula-focus-mode .chapter> :not(#formelsammlung),body.formula-focus-mode .topic-pager,body.formula-focus-mode .footer{display:none}
body.formula-focus-mode .shell{display:block;max-width:none;min-height:100svh}
body.formula-focus-mode main{display:flex;align-items:center;justify-content:center;min-height:100svh;padding:clamp(.6rem,2vw,1.25rem)}
body.formula-focus-mode .chapter{width:min(100%,1200px)}
body.formula-focus-mode .formula-sheet{height:calc(100svh - clamp(1.2rem,4vw,2.5rem));overflow:auto;margin:0;box-shadow:7px 7px 0 #091b14}
body.formula-focus-mode .formula-sheet-head{position:sticky;top:0;background:var(--paper);z-index:1}
.formula-sheet:fullscreen{width:100%;height:100%;overflow:auto;border:0;box-shadow:none;margin:0;padding:clamp(1rem,3vw,2rem);background:var(--paper)}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table{display:grid;grid-template-columns:1fr;gap:.75rem;table-layout:auto}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table caption{grid-column:1/-1}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table thead{display:grid;grid-template-columns:1fr}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table thead tr{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table thead th:first-child{width:auto}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.75rem}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody tr{display:grid;grid-template-columns:minmax(0,1fr) minmax(9rem,.8fr);align-items:center;border:2px solid var(--line);background:#fff}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody tr:nth-child(even){background:#f2f6ec}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody th,body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody td{border:0;padding:.85rem .9rem}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody th{overflow-wrap:break-word;word-break:normal}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody th:first-child{width:auto}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody .math-cell{font-size:clamp(.8rem,1.7vw,1.08rem)}
@media(max-width:640px){.formula-sheet{padding:.85rem}.formula-sheet-head{display:grid;grid-template-columns:1fr;gap:.75rem}.formula-actions{display:grid;grid-template-columns:1fr 1fr}.formula-layout-toggle,.formula-focus-toggle{width:100%}.formula-sheet .formula-table th:first-child{width:40%}.formula-sheet .formula-table th,.formula-sheet .formula-table td{padding:.5rem .45rem}.formula-sheet .formula-table .math-cell{font-size:clamp(.68rem,3vw,.9rem)}body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody tr{grid-template-columns:1fr}body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table thead{display:none}body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody{grid-template-columns:repeat(2,minmax(0,1fr));gap:.5rem}body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody th,body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody td{padding:.65rem .55rem}body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody .math-cell{font-size:clamp(.64rem,2.7vw,.8rem)}}

/* Final containment pass: these rules come after the component defaults so
   narrow viewports always collapse grids and allow long labels to wrap. */
.brand,.brand>div:last-child,.lesson,.lesson-body,.lesson-body>* ,.rule-section,.rule-head,.rule-head>div,.rule-head h3,.graph-grid,.graph-card,.condition-grid,.condition-card,.math-card-grid,.math-card{min-width:0}
.brand p,.brand-heading,.lesson summary,.lesson h3,.lesson p,.task,.rule-head h3,.rule-head p,.rule-example,.graph-card h3,.graph-card p,.condition-card strong,.condition-card span,.math-card h3,.math-card p,.seo-faq summary,.seo-faq p{overflow-wrap:break-word;word-break:normal}
.chapter h1,.chapter h2{overflow-wrap:break-word;word-break:normal}
.formula-table-wrap,.math-block,.formula,.rule-example,.code-sample{max-width:100%;overscroll-behavior-x:contain}
.formula-sheet .formula-table-wrap{overflow:visible}
@media(max-width:640px){
  .chapter-head{display:block}
  .chapter-no{display:block;margin-bottom:.25rem}
  .chapter-head h1,.chapter-head h2{width:100%;font-size:clamp(1.65rem,8vw,2.5rem);letter-spacing:-.025em}
  .chapter-head p{margin-top:.35rem}
  .lesson-body{grid-template-columns:1fr!important;min-width:0;max-width:100%}
  .lesson-body>*{min-width:0;max-width:100%}
  .graph-grid,.condition-grid,.math-card-grid{grid-template-columns:1fr!important;min-width:0}
  .graph-card,.condition-card,.math-card{min-width:0;max-width:100%}
  .rule-head{grid-template-columns:auto minmax(0,1fr);min-width:0}
  .rule-head>div{min-width:0}
  .rule-count{grid-column:2;justify-self:start;white-space:normal}
  .math-block{font-size:clamp(.82rem,3.2vw,.95rem);text-align:left}
  .math-block mjx-container{font-size:90%;max-width:100%;overflow-x:auto}
  .formula-table-wrap{max-width:100%;overflow-x:auto}
  .formula-sheet .formula-table-wrap{overflow:visible}
  .formula-sheet .formula-table{width:100%;min-width:0;table-layout:fixed}
  .formula-sheet .formula-table .math-cell mjx-container{display:inline-block;max-width:100%;font-size:.9em!important;white-space:normal}
}

/* Fullscreen formula sheet: use the whole viewport and let the grid adapt to it. */
body.formula-focus-mode main{padding:0;min-height:100svh}
body.formula-focus-mode .chapter{width:100%;height:100svh}
body.formula-focus-mode .formula-sheet,
.formula-sheet:fullscreen{
  box-sizing:border-box;
  width:100%;
  height:100svh;
  min-height:0;
  overflow:hidden;
  margin:0;
  border:0;
  box-shadow:none;
  display:flex;
  flex-direction:column;
  padding:clamp(.75rem,2vw,1.5rem);
}
body.formula-focus-mode .formula-sheet-head,
.formula-sheet:fullscreen .formula-sheet-head{
  position:static;
  flex:0 0 auto;
}
body.formula-focus-mode .formula-sheet .formula-table-wrap,
.formula-sheet:fullscreen .formula-table-wrap{
  flex:1 1 auto;
  min-height:0;
  overflow:hidden;
  display:flex;
}
body.formula-focus-mode .formula-sheet .formula-table,
.formula-sheet:fullscreen .formula-table{
  flex:1 1 auto;
  min-height:0;
}

/* The grid chooses as many readable columns as the viewport can hold. */
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table{
  display:grid;
  grid-template-columns:1fr;
  grid-template-rows:auto minmax(0,1fr);
  gap:clamp(.45rem,1vw,.8rem);
  table-layout:auto;
  height:100%;
}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table caption,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table caption{grid-column:1/-1}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table thead,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table thead{display:none}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody{
  display:grid;
  grid-column:1/-1;
  grid-template-columns:repeat(auto-fit,minmax(min(100%,21rem),1fr));
  grid-auto-rows:minmax(0,1fr);
  align-content:stretch;
  gap:clamp(.45rem,1vw,.85rem);
  min-height:0;
  overflow:hidden;
}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody tr,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody tr{
  min-width:0;
  min-height:0;
  height:auto;
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(9rem,.8fr);
  align-items:center;
  border:2px solid var(--line);
  background:#fff;
  overflow:hidden;
}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody tr:nth-child(even),
.formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody tr:nth-child(even){background:#f2f6ec}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody th,
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody td,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody th,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody td{
  min-width:0;
  border:0;
  padding:clamp(.5rem,1.2vw,1rem);
}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody th,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody th{
  width:auto;
  overflow-wrap:break-word;
  word-break:normal;
  font-size:clamp(.9rem,1.6vw,1.3rem);
  line-height:1.08;
}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody .math-cell,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody .math-cell{
  min-width:0;
  overflow:hidden;
  font-size:clamp(1rem,min(2vw,4vh),2rem);
  line-height:1.05;
  white-space:nowrap;
  text-align:center;
}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody .math-cell mjx-container,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody .math-cell mjx-container{
  max-width:100%;
  white-space:nowrap;
}

/* The list view also fits its ten rules into the fullscreen sheet. */
body.formula-focus-mode .formula-sheet:not(.formula-sheet--grid) .formula-table,
.formula-sheet:fullscreen:not(.formula-sheet--grid) .formula-table{
  height:100%;
  table-layout:fixed;
}
body.formula-focus-mode .formula-sheet:not(.formula-sheet--grid) .formula-table tbody,
.formula-sheet:fullscreen:not(.formula-sheet--grid) .formula-table tbody{height:100%}
body.formula-focus-mode .formula-sheet:not(.formula-sheet--grid) .formula-table tbody tr,
.formula-sheet:fullscreen:not(.formula-sheet--grid) .formula-table tbody tr{height:10%}
body.formula-focus-mode .formula-sheet:not(.formula-sheet--grid) .formula-table .math-cell,
.formula-sheet:fullscreen:not(.formula-sheet--grid) .formula-table .math-cell{
  font-size:clamp(.86rem,min(1.7vw,3.2vh),1.45rem);
  line-height:1.05;
  white-space:nowrap;
}

@media(max-width:640px){
  body.formula-focus-mode .formula-sheet,
  .formula-sheet:fullscreen{padding:.65rem}
  body.formula-focus-mode .formula-sheet-head p,
  .formula-sheet:fullscreen .formula-sheet-head p{display:none}
  body.formula-focus-mode .formula-sheet-head h2,
  .formula-sheet:fullscreen .formula-sheet-head h2{font-size:clamp(1.35rem,6vw,2rem);margin:.2rem 0 .4rem}
  body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody,
  .formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody{
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:.45rem;
  }
  body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody tr,
  .formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody tr{grid-template-columns:1fr}
  body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody th,
  body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody td,
  .formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody th,
  .formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody td{padding:.45rem .4rem}
  body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody th,
  .formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody th{font-size:clamp(.72rem,2.8vw,1rem);line-height:1.05}
  body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody .math-cell,
  .formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody .math-cell{
    font-size:clamp(.72rem,min(2.8vw,2.4vh),1rem);
    line-height:1;
  }
  body.formula-focus-mode .formula-sheet:not(.formula-sheet--grid) .formula-table .math-cell,
  .formula-sheet:fullscreen:not(.formula-sheet--grid) .formula-table .math-cell{font-size:clamp(.72rem,3vw,1rem)}
}

/* Grid cards keep the rule name and formula readable at every column count. */
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody{
  grid-template-columns:repeat(auto-fit,minmax(min(100%,34rem),1fr));
}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody tr,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody tr{
  grid-template-columns:1fr;
  grid-template-rows:auto minmax(0,1fr);
  justify-items:stretch;
}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody th,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody th{
  padding-bottom:.35rem;
}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody .math-cell,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody .math-cell{
  overflow:visible;
  padding-top:.2rem;
  font-size:clamp(1rem,min(2.4vw,4.8vh),2.4rem);
}

/* Deliberate breakpoints keep ten cards balanced instead of leaving a sparse last row. */
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody{
  grid-template-columns:repeat(2,minmax(0,1fr));
}
@media(min-width:1700px){
  body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody,
  .formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(min-width:2300px){
  body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody,
  .formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody{grid-template-columns:repeat(4,minmax(0,1fr))}
}
@media(min-width:2900px){
  body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody,
  .formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody{grid-template-columns:repeat(5,minmax(0,1fr))}
}

/* Formula cells open a readable teaching and learning view. */
.math-cell--interactive{cursor:zoom-in;transition:background .12s,box-shadow .12s}
.math-cell--interactive:hover,.math-cell--interactive:focus-visible{background:#fff1ad;outline:2px solid var(--orange);outline-offset:-3px}
.formula-modal{position:fixed;inset:0;width:min(92vw,1100px);max-width:none;margin:auto;border:0;padding:0;background:transparent;color:var(--ink)}
.formula-modal::backdrop{background:rgba(9,27,20,.82)}
.formula-modal-card{background:var(--paper);border:3px solid var(--line);box-shadow:8px 8px 0 #091b14;padding:clamp(1rem,3vw,2.5rem);min-height:min(60vh,620px);display:flex;flex-direction:column}
.formula-modal-head{display:flex;align-items:center;justify-content:space-between;gap:1rem;border-bottom:2px solid var(--line);padding-bottom:.8rem}
.formula-modal-close{border:2px outset #fff;background:var(--green);color:#fff;padding:.6rem .75rem;cursor:pointer;font:900 .72rem var(--pixel);white-space:nowrap}
.formula-modal-close:hover,.formula-modal-close:focus-visible{background:var(--orange);color:var(--ink);outline:2px solid var(--line);outline-offset:2px}
.formula-modal h2{font:900 clamp(1.55rem,4vw,3rem)/1.05 Georgia,serif;margin:1rem 0;overflow-wrap:break-word}
.formula-modal-equation{flex:1;display:grid;place-items:center;text-align:center;background:#15231f;color:#f9ffd7;border-left:8px solid var(--mint);padding:clamp(1.2rem,4vw,3rem);min-height:clamp(220px,42vh,480px);font-size:clamp(2rem,6vw,5rem);line-height:1.15;overflow:hidden}
.formula-modal-equation mjx-container{max-width:100%;white-space:normal}
@media(max-width:640px){.formula-modal{width:94vw}.formula-modal-card{padding:.85rem;box-shadow:5px 5px 0 #091b14}.formula-modal-head{align-items:flex-start}.formula-modal-close{padding:.55rem .5rem;font-size:.62rem}.formula-modal h2{font-size:clamp(1.35rem,7vw,2rem);margin:.8rem 0}.formula-modal-equation{min-height:35vh;font-size:clamp(1.45rem,9vw,3rem);padding:1rem .65rem;border-left-width:6px}.formula-modal-equation mjx-container{max-width:100%;font-size:.95em!important}}

/* Global archive search keeps subjects, explanations and tasks discoverable. */
.page-search{background:#d8e9ff;border:3px solid var(--line);box-shadow:5px 5px 0 var(--line);padding:clamp(1rem,3vw,1.6rem);margin:0 0 1.6rem;scroll-margin-top:80px}.page-search-head{display:grid;grid-template-columns:1fr auto;gap:1rem;align-items:start;border-bottom:2px solid var(--line);padding-bottom:1rem;margin-bottom:1rem}.page-search h3{font:900 clamp(1.35rem,3vw,2.1rem)/1.05 Georgia,serif;margin:.35rem 0 .45rem}.page-search-head p{max-width:760px;margin:0;color:var(--muted);font-size:.92rem}.search-stamp{width:68px;height:68px;display:grid;place-items:center;background:var(--orange);border:2px solid var(--line);box-shadow:3px 3px 0 var(--line);font:900 .82rem var(--pixel);transform:rotate(3deg)}.page-search-form{display:grid;grid-template-columns:auto minmax(0,1fr);align-items:center;gap:.75rem}.page-search-label{font:900 .72rem var(--pixel);letter-spacing:.05em;text-transform:uppercase}.page-search-input-wrap{display:flex;min-width:0;gap:.5rem}.page-search-input-wrap input{width:100%;min-width:0;border:2px solid var(--line);background:var(--paper);color:var(--ink);padding:.75rem .8rem;font:700 .98rem var(--sans);outline:none}.page-search-input-wrap input:focus{outline:3px solid var(--orange);outline-offset:2px}.page-search-input-wrap input::placeholder{color:#6a786f}.page-search-clear,.page-search-filter{border:2px outset #fff;background:var(--green);color:#fff;padding:.65rem .75rem;cursor:pointer;text-align:center;font:900 .68rem var(--pixel);white-space:nowrap}.page-search-clear:hover,.page-search-clear:focus-visible,.page-search-filter:hover,.page-search-filter:focus-visible{background:var(--orange);color:var(--ink);outline:2px solid var(--line);outline-offset:2px}.page-search-filters{display:flex;flex-wrap:wrap;gap:.55rem;margin:.9rem 0 .65rem}.page-search-filter{background:var(--paper);color:var(--ink)}.page-search-filter.is-active{background:var(--green);color:#fff}.page-search-status{margin:.55rem 0 0;font:700 .72rem var(--pixel);color:var(--muted)}.page-search-results{display:grid;gap:.6rem;margin-top:1rem}.page-search-results[hidden]{display:none}.search-result{display:grid;grid-template-columns:auto minmax(0,1fr);gap:.75rem;align-items:start;background:var(--paper);border:2px solid var(--line);box-shadow:3px 3px 0 var(--line);padding:.75rem;text-decoration:none;color:inherit}.search-result:hover,.search-result:focus-visible{background:#fff1ad;outline:2px solid var(--orange);outline-offset:2px}.search-result-tag{font:900 .62rem var(--pixel);padding:.3rem .4rem;background:var(--mint);border:1px solid var(--line);white-space:nowrap}.search-result[data-kind="task"] .search-result-tag{background:var(--orange)}.search-result-title{font:900 1rem/1.1 Georgia,serif;margin:0 0 .25rem}.search-result-snippet{margin:0;color:var(--muted);font-size:.84rem;line-height:1.4}.search-result-snippet mark{background:#fff1ad;color:inherit;padding:0 .08em}.search-empty{margin:0;background:#fff4d8;border:2px dashed var(--line);padding:.8rem;font-weight:700}.search-hit{animation:search-hit-pulse 1.2s ease both}@keyframes search-hit-pulse{0%{outline:0 solid transparent}30%{outline:4px solid var(--orange);outline-offset:4px}100%{outline:0 solid transparent}}
@media(max-width:640px){.page-search-head{grid-template-columns:1fr}.search-stamp{width:56px;height:56px}.page-search-form{grid-template-columns:1fr;gap:.35rem}.page-search-label{font-size:.66rem}.page-search-input-wrap{display:grid;grid-template-columns:1fr}.page-search-clear{width:100%}.page-search-filters{display:grid;grid-template-columns:1fr;gap:.45rem}.page-search-filter{width:100%}.search-result{grid-template-columns:1fr;gap:.45rem}}
.mobile-search-link{grid-column:1/-1;border:2px solid var(--line);background:var(--green);color:#fff;display:flex;align-items:center;justify-content:center;padding:.58rem .7rem;text-decoration:none;font:900 .76rem var(--pixel);box-shadow:3px 3px 0 var(--line)}.mobile-search-link:hover,.mobile-search-link:focus-visible{background:var(--orange);color:var(--ink);outline:2px solid var(--mint);outline-offset:2px}
.search-result-meta{display:block;margin:0 0 .28rem;color:var(--blue);font:900 .65rem var(--pixel);letter-spacing:.04em;text-transform:uppercase}

/* Exercise focus keeps the task workspace wide and removes surrounding chrome. */
.exercise-focus-actions{grid-column:1/-1;display:flex;justify-content:flex-end;gap:.6rem}
.exercise-focus-toggle{border:2px outset #fff;background:var(--orange);color:var(--ink);padding:.65rem .8rem;cursor:pointer;text-align:center;font:900 .72rem var(--pixel);white-space:nowrap}
.exercise-focus-toggle:hover,.exercise-focus-toggle:focus-visible{background:#fff1ad;outline:2px solid var(--mint);outline-offset:2px}
body.exercise-focus-mode{background:var(--green);overflow-x:hidden}
body.exercise-focus-mode .top,body.exercise-focus-mode .shell>aside,body.exercise-focus-mode .mobile-nav,body.exercise-focus-mode .breadcrumb,body.exercise-focus-mode .chapter-head,body.exercise-focus-mode .chapter-intro,body.exercise-focus-mode .rule-grid,body.exercise-focus-mode .training-footnote,body.exercise-focus-mode .topic-pager,body.exercise-focus-mode .footer{display:none}
body.exercise-focus-mode .shell{display:block;max-width:none;min-height:100svh}
body.exercise-focus-mode main{min-height:100svh;padding:clamp(.75rem,2.4vw,2rem)}
body.exercise-focus-mode .chapter{width:min(100%,1500px);margin:0 auto}
body.exercise-focus-mode .progress-panel{position:sticky;top:0;z-index:12;margin-bottom:1.25rem;box-shadow:4px 4px 0 #091b14}
body.exercise-focus-mode .rule-section{max-width:1500px;margin-left:auto;margin-right:auto;scroll-margin-top:120px}
body.exercise-focus-mode .rule-example,body.exercise-focus-mode .exercise-list,body.exercise-focus-mode .solutions{max-width:1200px;margin-left:auto;margin-right:auto}
body.exercise-focus-mode .exercise-focus-toggle{background:var(--mint);color:var(--ink)}
@media(max-width:640px){.exercise-focus-actions{justify-content:stretch}.exercise-focus-toggle{width:100%;font-size:.66rem;padding:.6rem .55rem}body.exercise-focus-mode main{padding:.65rem}body.exercise-focus-mode .rule-section{padding:.85rem;margin-bottom:1rem}body.exercise-focus-mode .rule-head{grid-template-columns:auto 1fr}.exercise-focus-mode .rule-count{grid-column:2}}

/* A small, uncropped comparison gallery for the page's own learning images. */
.page-image-gallery{margin:2rem 0 1.5rem;padding:clamp(.8rem,2.4vw,1.35rem);background:var(--paper);border:3px solid var(--line);box-shadow:var(--shadow)}
.page-image-gallery-head{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;border-bottom:2px solid var(--line);padding-bottom:.8rem;margin-bottom:1rem}
.page-image-gallery-head h2{font:900 clamp(1.35rem,3vw,2rem)/1.05 Georgia,serif;margin:.3rem 0 .45rem}
.page-image-gallery-head p{margin:0;color:var(--muted);font-size:.9rem}
.page-image-gallery-count{flex:0 0 auto;background:var(--mint);border:2px solid var(--line);padding:.45rem .55rem;font:900 .65rem var(--pixel)}
.page-image-gallery-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,230px),1fr));align-items:start;gap:1rem}
.page-image-gallery-card{display:flex;flex-direction:column;min-width:0;border:2px solid var(--line);background:#eef2e9;color:var(--ink);padding:.55rem;text-align:left;cursor:zoom-in;box-shadow:3px 3px 0 var(--line)}
.page-image-gallery-card:hover,.page-image-gallery-card:focus-visible{outline:3px solid var(--orange);outline-offset:2px;background:#fff1ad}
.page-image-gallery-preview{display:flex;align-items:center;justify-content:center;width:100%;aspect-ratio:var(--gallery-ratio,4/5);overflow:hidden;background:#e0e7df;border:1px solid #a9afa8}
.page-image-gallery-preview img{display:block;width:100%;height:100%;object-fit:contain}
.page-image-gallery-label{display:block;margin:.65rem .1rem .2rem;font:900 .72rem/1.35 var(--pixel)}
.page-image-gallery-dimensions{display:block;margin:0 .1rem .1rem;color:var(--muted);font:700 .62rem var(--pixel)}
.page-image-gallery-modal{position:fixed;inset:0;box-sizing:border-box;width:100vw;height:100vh;height:100dvh;max-width:none;max-height:none;margin:0;border:0;padding:0;background:#091b14;color:#f8f5e9;overflow:hidden}
.page-image-gallery-modal::backdrop{background:#091b14}
.page-image-gallery-modal[open]{display:flex;flex-direction:column}
.page-image-gallery-modal-head{flex:0 0 auto;display:flex;align-items:center;justify-content:space-between;gap:.8rem;min-height:3.6rem;padding:.55rem clamp(.65rem,2vw,1.5rem);background:#132a22;border-bottom:1px solid #5f746a}
.page-image-gallery-modal-title{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font:800 .75rem var(--pixel)}
.page-image-gallery-modal-tools{display:flex;align-items:center;gap:.4rem;flex:0 0 auto}
.page-image-gallery-modal-count{min-width:3.2rem;text-align:center;font:700 .65rem var(--pixel);color:#c5d8cb}
.page-image-gallery-modal-control{border:1px solid #aab8ad;background:#1a3c30;color:#fff;padding:.5rem .6rem;cursor:pointer;font:900 .7rem var(--pixel)}
.page-image-gallery-modal-control:hover,.page-image-gallery-modal-control:focus-visible{background:var(--orange);color:var(--ink);outline:2px solid var(--mint);outline-offset:1px}
.page-image-gallery-modal-stage{flex:1 1 auto;min-width:0;min-height:0;display:flex;align-items:center;justify-content:center;overflow:hidden;padding:clamp(.35rem,1.5vw,1.25rem)}
.page-image-gallery-modal-stage img{display:block;max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain}
@media(max-width:640px){.page-image-gallery-head{gap:.55rem}.page-image-gallery-head p{font-size:.82rem}.page-image-gallery-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:.6rem}.page-image-gallery-card{padding:.35rem;box-shadow:2px 2px 0 var(--line)}.page-image-gallery-label{font-size:.62rem}.page-image-gallery-dimensions{font-size:.56rem}.page-image-gallery-modal-head{min-height:3.2rem}.page-image-gallery-modal-title{font-size:.61rem}.page-image-gallery-modal-control{padding:.48rem .45rem}.page-image-gallery-modal-count{min-width:2.6rem;font-size:.58rem}.page-image-gallery-modal-stage{padding:.25rem}}

/* Keep the subject rail flush to the viewport while the reading column stays centered. */
.shell{width:100%;max-width:none;margin:0;grid-template-columns:292px minmax(0,1fr)}
.shell>main>*{width:min(100%,1100px);margin-left:auto;margin-right:auto}
@media(max-width:900px){.shell{grid-template-columns:minmax(0,1fr)}}

/* Make equations readable in every rule table, including the Potenzgesetze focus view. */
.formula-table .math-cell{font-size:clamp(1.1rem,1.35vw,1.45rem);line-height:1.25}
.formula-sheet .formula-table .math-cell{font-size:clamp(1.25rem,1.5vw,1.55rem);line-height:1.18}
body.formula-focus-mode .formula-sheet:not(.formula-sheet--grid) .formula-table .math-cell,
.formula-sheet:fullscreen:not(.formula-sheet--grid) .formula-table .math-cell{font-size:clamp(1.35rem,min(2.6vw,4.3vh),2.5rem);line-height:1.1}
body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody .math-cell,
.formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody .math-cell{font-size:clamp(1.5rem,min(2.8vw,4.6vh),3rem);line-height:1.12}
body.formula-focus-mode .formula-sheet .formula-table .math-cell mjx-container,
.formula-sheet:fullscreen .formula-table .math-cell mjx-container{max-width:100%;font-size:1em!important}
@media(min-width:1700px) and (max-width:2299px){
  body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody,
  .formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:640px){
  .formula-table .math-cell{font-size:clamp(1rem,3.8vw,1.2rem)}
  .formula-sheet .formula-table .math-cell{font-size:clamp(1rem,3.8vw,1.2rem)}
  body.formula-focus-mode .formula-sheet:not(.formula-sheet--grid) .formula-table .math-cell,
  .formula-sheet:fullscreen:not(.formula-sheet--grid) .formula-table .math-cell{font-size:clamp(1rem,3.8vw,1.25rem);white-space:normal}
  body.formula-focus-mode .formula-sheet.formula-sheet--grid .formula-table tbody .math-cell,
  .formula-sheet:fullscreen.formula-sheet--grid .formula-table tbody .math-cell{font-size:clamp(.95rem,3.5vw,1.15rem)}
  body.formula-focus-mode .formula-sheet .formula-table .math-cell mjx-container,
  .formula-sheet:fullscreen .formula-table .math-cell mjx-container{display:inline-block;max-width:100%;font-size:.92em!important;white-space:normal}
}