/* One physical page definition for preview, measurement and print. No fit-to-box text shrinking. */
.a4-paper{box-sizing:border-box;width:210mm;height:297mm;padding:10mm 12mm;margin:0;background:#fff;color:#17212d;font-family:Arial,sans-serif;font-size:var(--a4-font,10pt);line-height:1.35;position:relative;flex:none;box-shadow:0 5px 24px #17233a22;text-align:left}
.a4-paper *{box-sizing:border-box}.a4-header{height:16mm;display:flex;gap:3mm;align-items:center;border-bottom:.4mm solid #17233a;margin-bottom:4mm;padding-bottom:2mm}.a4-header>div{flex:1;min-width:0}.a4-header b{font-size:10pt;display:block;line-height:1.1;max-height:9mm;overflow-wrap:anywhere;overflow:hidden}.a4-header span{display:block;font-size:8pt;margin-top:1.5mm;white-space:nowrap}.a4-header img{width:10mm;height:10mm;object-fit:contain}.a4-header small{font-size:6.5pt;font-weight:bold;line-height:1.3}.a4-body{height:248mm;display:grid;grid-template-columns:repeat(var(--a4-columns,2),minmax(0,1fr));gap:8mm;position:relative}.a4-column{min-width:0;height:248mm;display:flex;flex-direction:column;gap:5mm;position:relative;overflow:visible}.a4-column+.a4-column:before{content:"";position:absolute;left:-4mm;top:0;bottom:0;border-left:.2mm solid #d6dce2}.a4-block{flex:none;display:flow-root;min-width:0;overflow-wrap:anywhere;font-size:inherit;cursor:grab;outline-offset:1mm}.a4-block:active{cursor:grabbing}.a4-block:hover{outline:.25mm dashed #cbd4df}.a4-block h3{font:bold 10pt/1.3 Arial,sans-serif;margin:0 0 2mm;color:#17233a}.a4-context{font-size:inherit;line-height:1.35}.a4-context p{margin:0 0 1.5mm}.a4-context table{width:100%;border-collapse:collapse}.a4-context td,.a4-context th{padding:.8mm;border:.2mm solid #c4cbd4}.a4-shared{font-size:8pt;font-weight:bold;line-height:1.3;margin:0 0 2mm}.a4-figure{display:block;width:100%;height:auto;max-height:100mm;object-fit:contain;margin:2mm 0}.a4-question{margin-top:2.5mm;display:flow-root}.a4-stem{font-size:inherit;font-weight:600;line-height:1.35}.a4-number{font-weight:800}.a4-choices{display:grid;gap:1mm;margin-top:2mm;font-size:inherit;line-height:1.3}.a4-choices>div{display:grid;grid-template-columns:5mm minmax(0,1fr);gap:1mm}.a4-answer-space{position:relative;margin-top:2mm;background:repeating-linear-gradient(to bottom,transparent 0,transparent 6.8mm,#e6e9ed 6.8mm,#e6e9ed 7mm);border-top:.2mm solid #dce2e8}.a4-answer-space span{font:6pt Arial,sans-serif;color:#8d97a2;background:white;position:absolute;top:.5mm;right:0;padding-left:1mm}.a4-footer{display:flex;justify-content:space-between;align-items:center;height:6mm;margin-top:3mm;font:7pt Arial,sans-serif;color:#687584;border-top:.2mm solid #e3e7ec}.a4-blank-message{position:absolute;inset:0;display:grid;place-items:center;color:#9aa3ad;font-size:10pt}.a4-paper .math-frac{font-size:1em}.a4-paper .math-num,.a4-paper .math-den{line-height:1.15}
.a4-measure{position:absolute;left:-20000px;top:0;visibility:hidden;pointer-events:none;contain:layout style}.a4-measure .a4-paper{height:auto}.a4-measure .a4-column{overflow:visible}.a4-measure .a4-block{outline:0}
#builder-view .section-shell{max-width:1760px;padding-inline:24px}.a4-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:12px;background:white;border:1px solid #dce1e8;border-radius:12px;padding:14px;margin-bottom:12px}.a4-toolbar label{display:flex;align-items:center;gap:7px;font-size:12px;font-weight:700}.a4-toolbar select,.a4-sidebar select,.a4-move-dialog select{font:inherit;border:1px solid #c4cfdc;border-radius:7px;padding:8px;background:white;color:#17233a}.a4-toolbar button,.a4-sidebar button,.a4-move-dialog button{font:700 12px Arial,sans-serif;padding:9px 12px;border:1px solid #c6ced9;border-radius:7px;background:white;color:#17233a;cursor:pointer}.a4-toolbar button:disabled,.a4-sidebar button:disabled{opacity:.5;cursor:default}.a4-status-row{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:16px 0;font-size:14px;color:#17233a}.a4-print-note{font-size:12px;color:#647387;margin:0 0 18px}.a4-errors{padding:14px;background:#fff1ee;color:#9c2821;border:1px solid #e5a197;border-radius:8px;font-size:14px;line-height:1.5;margin:12px 0}
#builder-view .builder-layout{grid-template-columns:280px minmax(0,1fr);gap:22px;align-items:start}.a4-sidebar{position:sticky;top:95px;max-height:calc(100vh - 110px);overflow:auto;background:#fff;border:1px solid #dde3ea;border-radius:12px;padding:16px;scrollbar-width:thin}.a4-sidebar summary{cursor:pointer;font-weight:800;font-size:14px;margin:0 0 12px}.a4-sidebar details+details{margin-top:18px;border-top:1px solid #e2e6ec;padding-top:16px}.a4-sidebar input{width:100%;font-size:13px;border:1px solid #bdc9d5;border-radius:7px;padding:10px;margin:0 0 10px}.a4-sidebar>details>select{width:100%}.a4-library-card,.a4-selection-block{border:1px solid #dfe4ea;border-radius:8px;padding:11px;margin:10px 0;background:#fff}.a4-library-card[data-movable=true]{cursor:grab}.a4-library-card>b{display:block;font-size:12px;line-height:1.4;margin:5px 0}.a4-library-card p{font-size:11px;line-height:1.5;color:#65748a;margin:5px 0 10px}.a4-library-card small,.a4-selection-block>small{font-size:10px;color:#748197}.a4-library-card>div,.a4-selection-actions{display:flex;gap:7px}.a4-library-card button,.a4-selection-actions button{font-size:11px;padding:7px 9px}.a4-selection-head{display:flex;align-items:center;gap:7px;cursor:grab;font-size:12px;line-height:1.4}.a4-selection-head>span{font-size:24px;color:#8d99a8}.a4-selection-actions{margin-top:10px}.a4-space-row{display:flex;align-items:center;gap:5px;margin-top:10px}.a4-space-row label{display:grid;gap:5px;font-size:11px;flex:1}.a4-space-row select{width:100%}.a4-library-hint{font-size:11px;color:#65748a;line-height:1.5}
#builder-view .builder-list-panel{min-width:0;background:transparent;border:0;box-shadow:none;overflow:visible}.test-title-row{background:white;border:1px solid #dce2e9;border-radius:10px;margin-bottom:18px;padding:15px}.a4-spreads{display:flex!important;flex-direction:column;gap:28px;overflow-x:auto;padding:3px 2px 28px!important;min-width:0;background:transparent!important}.a4-spread{display:grid;grid-template-columns:1fr;gap:22px;justify-items:center}.a4-spreads.side-by-side .a4-spread.duplex{grid-template-columns:repeat(2,minmax(0,1fr));align-items:start}.a4-sheet-wrap{width:var(--paper-width);max-width:none}.a4-face-label{font-size:12px;font-weight:800;color:#53677e;margin:0 0 10px}.a4-scaled{width:var(--paper-width);height:var(--paper-height);position:relative}.a4-scaled>.a4-paper{transform:scale(var(--paper-scale));transform-origin:top left}.a4-dragging .a4-column{outline:.5mm dashed #8da6be;background:#f5faff55}.a4-column.drop-target{outline:1mm solid #df7954;background:#fff4e999}.a4-summary-inline{display:flex;gap:18px;flex-wrap:wrap;font-size:12px;padding:14px;border-top:1px solid #dce2e9}.a4-summary-inline .distribution,.a4-summary-inline #capacity-bar{display:none}.a4-move-dialog{width:min(460px,92vw);border:0;border-radius:14px;padding:28px;color:#17233a}.a4-move-dialog::backdrop{background:#17233a99}.a4-move-dialog h3{font-size:21px;margin:0 0 16px}.a4-move-dialog form{display:grid;gap:16px}.a4-move-dialog label{display:grid;gap:7px;font-size:13px}.a4-move-dialog .actions{display:flex;justify-content:flex-end;gap:10px}.a4-move-dialog button[type=submit]{background:#17233a;color:white}
.live-a4-page:has(>.a4-paper){width:100%;aspect-ratio:auto;position:relative;overflow:hidden}.live-a4-page>.a4-paper{transform:scale(var(--live-scale));transform-origin:top left;box-shadow:none}.a4-toolbar input[type=checkbox]{accent-color:#17233a}
@media(max-width:1000px){#builder-view .builder-layout{grid-template-columns:230px minmax(0,1fr)}#builder-view .page-heading{align-items:flex-start;gap:16px;flex-direction:column}}
@media(max-width:700px){#builder-view .section-shell{padding-inline:12px}#builder-view .builder-layout{grid-template-columns:1fr}.a4-sidebar{position:static;max-height:340px}.a4-toolbar{gap:10px}.a4-status-row{align-items:flex-start;flex-direction:column}.a4-toolbar label{font-size:11px}.heading-actions{flex-wrap:wrap}.a4-spreads{overflow-x:auto}}
@media print{
 @page{size:A4 portrait;margin:0}
 body.a4-printing{background:white!important;margin:0!important;padding:0!important}
 body.a4-printing>*:not(#print-root){display:none!important}
 body.a4-printing #print-root{display:block!important;width:auto!important;margin:0!important;padding:0!important;position:static!important}
 .a4-print-booklet{margin:0!important;padding:0!important;display:block!important}
 .a4-print-booklet>.a4-paper{transform:none!important;box-shadow:none;break-inside:avoid;page-break-inside:avoid;break-after:page;page-break-after:always;print-color-adjust:exact;-webkit-print-color-adjust:exact}
 .a4-print-booklet>.a4-paper:last-child{break-after:auto;page-break-after:auto}
 .a4-paper .a4-block{outline:0!important;cursor:default}.a4-paper .a4-column{outline:0!important;background:transparent!important}

}

.a4-selection-head,.a4-block,.a4-library-card[data-movable=true]{touch-action:none}.a4-dragging{user-select:none}

/* Answer measurements and print share these rules; no print-only font changes. */
.a4-paper.a4-answer-paper{--a4-font:9.5pt}
.a4-answer-paper .a4-body{display:block}
.a4-answer-column{height:248mm;display:flex;flex-direction:column;gap:4mm;min-width:0}
.a4-answer-block,.a4-answer-key{flex:none;display:flow-root;font:9.5pt/1.45 Arial,sans-serif;overflow-wrap:anywhere}
.a4-answer-block>b{display:block;font-size:10pt;margin:0 0 2mm;color:#17233a}
.a4-answer-paper .solution-steps{margin:0;padding:0;list-style:none}
.a4-answer-paper .solution-step{padding:2mm 0;border-top:.2mm solid #dfe5eb}
.a4-answer-paper .solution-step h4{font:700 9.5pt/1.3 Arial,sans-serif;margin:0 0 1.5mm;display:flex;gap:2mm;align-items:center}
.a4-answer-paper .solution-step h4 span{width:5mm;height:5mm;font-size:8pt}
.a4-answer-paper p{font:9.5pt/1.45 Arial,sans-serif;margin:0 0 1.5mm}
.a4-answer-paper .solution-calculation{font:9.5pt/1.5 Arial,sans-serif;margin:1.5mm 0 0;padding:1.5mm 3mm;border-left:.6mm solid #3b7b75;white-space:pre-wrap}
.a4-answer-paper .reasoning-extension{font:9.5pt/1.45 Arial,sans-serif;margin:2mm 0 0;padding:2mm;border:.2mm solid #cddfdc;border-radius:0}
.a4-answer-paper .reasoning-extension h4{font:700 9.5pt/1.3 Arial,sans-serif;margin:0 0 1.5mm}
.a4-answer-key h2{font:700 13pt/1.2 Arial,sans-serif;margin:0 0 3mm}
.a4-answer-key>div{display:grid;grid-template-columns:repeat(8,1fr);gap:1mm;border:.2mm solid #b9c3ce;padding:2mm}
.a4-answer-key span{display:flex;justify-content:space-around;font:10pt/1.5 Arial,sans-serif}
.a4-answer-key span b{color:#667285}

/* Compact spacing changes only whitespace, never the question order or font size. */
.a4-paper[data-spacing="compact"] .a4-column{gap:3mm}
.a4-paper[data-spacing="compact"] .a4-block h3{margin-bottom:1.5mm}
.a4-paper[data-spacing="compact"] .a4-figure{margin:1.5mm 0}
.a4-paper[data-spacing="compact"] .a4-question{margin-top:1.5mm}
.a4-paper[data-spacing="compact"] .a4-choices{gap:.7mm;margin-top:1.5mm}
/* Keep each physical page's header in its own unfragmented print box. */
.a4-header,.a4-footer{break-inside:avoid;page-break-inside:avoid}

/* Chromium may repaint an opaque page background over preceding header content. */
@media print{.a4-print-booklet>.a4-paper{background:transparent!important}.a4-paper .a4-header{position:relative;z-index:1}}