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@media(prefers-reduced-motion:no-preference){button{transition:background .15s,border-color .15s}}
/* Topic catalogue and document review */
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@media(max-width:1250px){.subtopic-list{grid-template-columns:repeat(2,minmax(0,1fr))}.review-fields{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.subtopic-list{grid-template-columns:1fr}.catalog-toolbar{display:grid;grid-template-columns:1fr;gap:14px}.catalog-toolbar label{min-width:0}.topic-card-head{padding:0 0 14px}.review-fields,.review-options{grid-template-columns:1fr}.review-question{padding:14px}.import-review{padding:18px 13px}.document-import-panel{padding:20px}.upload-form label{min-width:0;flex-basis:100%}.upload-form button{width:100%}.figure img{max-height:480px}.question-table{font-size:.9375rem}.page-heading{flex-wrap:wrap}}

.rich-content,.rich-paragraph,.editable-text,.question-prompt,.option-content,.scheme,.feedback p,.question-table td{text-align:left}.figure img{margin-left:0;margin-right:auto;object-position:left top}.question-table.statement-columns{width:100%;table-layout:fixed;border:0}.question-table.statement-columns td{border:0;width:50%;padding:8px 18px;vertical-align:top}.statement-columns .rich-paragraph{margin-bottom:12px}
/* Full exam pages must remain readable at the question column width. */
.question-prompt .figure img,.scheme .figure img{max-height:none}

.bank-dialog{width:min(1200px,94vw);max-width:94vw;max-height:92vh;padding:0;border:1px solid var(--line);border-radius:14px;color:var(--navy);background:#fff;box-shadow:0 24px 90px #12345340;overflow:hidden}.bank-dialog::backdrop{background:#102a46a6}.bank-dialog-header{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:18px 24px;border-bottom:1px solid var(--line)}.bank-dialog-header h2{margin:0 0 4px}.bank-dialog-body{max-height:calc(92vh - 100px);overflow:auto;padding:24px}.bank-dialog-edit{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(290px,1fr);gap:24px;overflow:hidden}.bank-question-preview{min-width:0}.bank-dialog-edit .bank-question-preview,.bank-subtopic-editor{overflow:auto;max-height:calc(92vh - 148px)}.bank-subtopic-editor{border-left:1px solid var(--line);padding-left:24px}.bank-subtopic-editor h3{margin-top:0}.bank-preview-option{display:flex;align-items:start;gap:14px;padding:10px 0;border-top:1px solid var(--line)}.bank-preview-option>div{min-width:0}.placement-row{display:grid;gap:10px;padding:14px 0;border-bottom:1px solid var(--line)}.placement-row select{width:100%;max-width:100%}.placement-row button{justify-self:start}.bank-save{margin-top:20px}.bank-dialog .figure img{max-height:none}.bank-dialog .figure:first-child{margin-top:0}body:has(.bank-dialog[open]){overflow:hidden}@media(max-width:750px){.bank-dialog-edit{display:block;overflow:auto}.bank-dialog-edit .bank-question-preview,.bank-subtopic-editor{max-height:none;overflow:visible}.bank-subtopic-editor{border-left:0;border-top:1px solid var(--line);padding:20px 0 0;margin-top:20px}.bank-dialog-body{padding:16px}.bank-dialog-header{padding:14px 16px}}

.option-content .figure img{max-height:none}.bank-scheme{margin-top:24px;padding-top:16px;border-top:1px solid var(--line)}

.rich-content .figure.notation{margin:6px 0}.rich-content .figure.notation img{max-height:2.2em;width:auto;max-width:100%}
.question-content-editor{border:1px solid var(--line);border-radius:8px;padding:14px;margin-bottom:24px}.question-content-editor>summary{cursor:pointer;font-weight:700;color:var(--blue,#1768c5)}.question-content-editor fieldset{border:1px solid var(--line);border-radius:6px;margin:16px 0;padding:12px;min-width:0}.question-content-editor legend{font-weight:700}.editable-block{margin-bottom:12px}.editable-text{border:1px solid #bac8d6;border-radius:5px;padding:10px;min-height:45px;white-space:pre-wrap;background:white;overflow-wrap:anywhere}.editable-text:focus{outline:2px solid #276ed1}.editable-text .rich-paragraph{margin:0}.editable-block>.row{justify-content:space-between;margin-top:5px}.editable-block select{padding:4px}.editable-block .figure img{max-height:220px}.question-content-editor .table-scroll{margin:10px 0}.question-content-editor td{min-width:180px}.question-content-editor .bank-save{position:sticky;bottom:0;background:white;padding:12px 0;border-top:1px solid var(--line)}
.bank-review-filters{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:12px}.review-count{display:inline-block;min-width:1.7em;margin-left:6px;padding:2px 7px;border-radius:20px;background:#12345310;font-size:.8em}.bank-review-filters .primary .review-count{background:#ffffff26}.bank-review-filters+ .help{margin-bottom:20px}
/* Teacher paper library and paired topic worksheets. */
.paper-controls{display:flex;gap:24px;align-items:end;flex-wrap:wrap}.paper-controls>label{min-width:220px}.paper-types{flex-wrap:wrap}.paper-document-heading{margin-top:24px;gap:12px;flex-wrap:wrap}.paper-viewer{width:100%;height:75vh;min-height:480px;border:1px solid var(--line,#dbe3ea);border-radius:8px;background:#edf1f4}.button{display:inline-flex;align-items:center;justify-content:center;padding:11px 17px;border:1px solid #ccd8e2;border-radius:8px;color:#173b59;background:#fff;text-decoration:none;font-weight:600;font-size:14px}.button.primary{background:#173b59;color:#fff;border-color:#173b59}.button:hover{filter:brightness(.95)}.export-years{border:1px solid #dbe3ea;border-radius:10px;padding:16px}.export-years legend{font-weight:600;padding:0 6px}.year-checks{display:grid;grid-template-columns:repeat(auto-fit,minmax(165px,1fr));gap:14px}.year-checks label,.export-writing{display:flex;align-items:center;gap:9px}.year-checks input,.export-writing input{width:18px;height:18px;margin:0;flex-shrink:0}.export-writing[hidden]{display:none}.export-references{margin:12px 0}.export-references p{line-height:1.9;max-height:190px;overflow:auto}.export-ready{margin-top:24px;padding:22px;background:#edf6f3;border:1px solid #c9e2d8;border-radius:12px}.export-ready .row{flex-wrap:wrap}.export-ready h2{margin-top:0}@media(max-width:700px){.paper-viewer{min-height:420px}.paper-controls>label{width:100%}.paper-types{gap:8px}.paper-types button{font-size:12px}.export-ready .button{width:100%}}
/* Read a complete paper and classify each question without opening dialogs. */
.classification-toolbar{margin-bottom:24px}.classification-toolbar .review-fields{margin-top:0}.classification-cards{display:grid;gap:26px}.classification-card{scroll-margin-top:20px}.classification-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-bottom:18px;border-bottom:1px solid var(--line)}.classification-heading h2{margin:7px 0 0}.classification-label{font-size:.8rem;line-height:1.4;background:#edf3fa;color:#244f7d;padding:7px 11px;border-radius:7px}.classification-body{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(270px,1fr);gap:28px;align-items:start;padding-top:22px}.classification-question{min-width:0}.classification-question .question-prompt{margin-top:0}.classification-question .figure img{max-height:none}.classification-question .bank-preview-option>div{flex:1}.classification-editor{min-width:0;position:sticky;top:20px;padding:20px;border:1px solid var(--line);background:#f8fafc;border-radius:10px}.classification-editor h3{margin-top:0}.classification-editor .placement-row:first-child{padding-top:0}.classification-editor .bank-save{margin-top:16px}.classification-editor [data-add-classification]{margin-top:16px}.classification-save-status{min-height:2.6em;line-height:1.4}.classification-editor select{font-size:.875rem}.classification-heading .help{margin:0}@media(max-width:1050px){.classification-body{grid-template-columns:minmax(0,1fr)}.classification-editor{position:static}.classification-placements{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}}@media(max-width:600px){.classification-placements{grid-template-columns:minmax(0,1fr)}.classification-heading{align-items:start;flex-direction:column}.classification-card{padding:20px 16px}.classification-editor{padding:16px}}
.classification-leave-dialog{width:min(480px,90vw);border:1px solid var(--line);border-radius:12px;padding:24px;color:var(--navy)}.classification-leave-dialog::backdrop{background:#102a46a6}.classification-leave-dialog h2{margin-top:0}.classification-leave-dialog p{line-height:1.6}.classification-leave-dialog .row{flex-wrap:wrap;gap:10px;margin-top:22px}

.part-context-note{padding:12px 16px;margin:0 0 20px;border-left:3px solid #267c80;background:#f0f7f7;border-radius:4px}.part-context-note p{margin:6px 0 10px}

.figure.scan-line,.figure.scan-lines{margin:5px 0}.figure.scan-line img{max-height:1.4em;width:auto;max-width:100%}.figure.scan-lines img{max-height:2.8em;width:auto;max-width:100%}

/* Direct-manipulation question image cropper. */
.crop-stage{position:relative;margin:16px auto;touch-action:none;overflow:hidden;line-height:0}.crop-stage canvas{display:block;width:100%;height:auto}.crop-selection{position:absolute;box-sizing:border-box;border:2px solid #1475d1;box-shadow:0 0 0 2000px #10243888;cursor:move;touch-action:none}.crop-selection button{position:absolute;width:22px;height:22px;min-width:0;padding:0;margin:0;transform:translate(-50%,-50%);border:2px solid white;border-radius:4px;background:#1475d1;touch-action:none}.crop-selection button:focus-visible{outline:3px solid #ffb000;outline-offset:2px}.crop-selection [data-handle=n],.crop-selection [data-handle=s]{width:44px;cursor:ns-resize}.crop-selection [data-handle=w],.crop-selection [data-handle=e]{height:44px;cursor:ew-resize}.crop-selection [data-handle=nw],.crop-selection [data-handle=se]{cursor:nwse-resize}.crop-selection [data-handle=ne],.crop-selection [data-handle=sw]{cursor:nesw-resize}
.crop-selection button:hover,.crop-selection button:focus{background:#1475d1;border-color:#fff}
.crop-selection [data-handle=nw]{transform:translate(0,0)}
.crop-selection [data-handle=n]{transform:translate(-50%,0)}
.crop-selection [data-handle=ne]{transform:translate(-100%,0)}
.crop-selection [data-handle=e]{transform:translate(-100%,-50%)}
.crop-selection [data-handle=se]{transform:translate(-100%,-100%)}
.crop-selection [data-handle=s]{transform:translate(-50%,-100%)}
.crop-selection [data-handle=sw]{transform:translate(0,-100%)}
.crop-selection [data-handle=w]{transform:translate(0,-50%)}

.chemical-symbol{display:inline-flex;align-items:center;vertical-align:middle;white-space:nowrap;line-height:1.15}.chemical-stack{display:inline-flex;flex-direction:column;font-size:.68em;line-height:1.05;text-align:center;align-self:center}.chemical-stack>span{min-height:1.05em}.chemical-preview{font-size:30px;min-height:45px}.editable-text .chemical-symbol{border-bottom:1px dotted #1475d1;cursor:pointer}.formula-toolbar{gap:6px;margin:8px 0}.block-order{gap:8px;margin-bottom:8px}

.choice-matrix .choice-matrix-row{display:grid;gap:12px;align-items:start;padding:12px;border:1px solid transparent;width:100%;box-sizing:border-box}.choice-matrix .choice-matrix-2{grid-template-columns:32px repeat(2,minmax(0,1fr))}.choice-matrix .choice-matrix-3{grid-template-columns:32px repeat(3,minmax(0,1fr))}.choice-matrix .choice-matrix-header{border-bottom:2px solid #bdcbd6}.choice-matrix-row>.rich-content{min-width:0;overflow-wrap:anywhere}.choice-matrix-row img{max-width:100%}.choice-matrix-row strong{text-align:left}
.source-crop-viewport{max-height:60vh;overflow:auto;border:1px solid #dce5ee;border-radius:8px;margin:12px 0}.source-crop-viewport .crop-stage{flex-shrink:0}

.question-edit-actions{display:flex;justify-content:flex-end;margin:0 0 16px}.question-edit-dialog{width:min(1100px,94vw)}.question-edit-dialog .question-content-editor{border:0;padding:0;margin:0}.question-edit-dialog .bank-dialog-header h2{margin:0}.question-edit-dialog .bank-dialog-body{overflow:auto}.bank-scheme>summary{cursor:pointer}

.question-edit-actions{margin:20px 0 0}.context-choice{display:flex;align-items:flex-start;gap:10px;padding:6px 0}.context-choice input{width:auto;flex:none;margin-top:3px}.related-context-controls{margin-bottom:20px}.linked-context-block{background:#f5f8fc}

/* One persistent pair of controls beside the current question. */
.classification-cards{display:grid;grid-template-columns:46px minmax(0,1fr) 46px;gap:10px;overflow-anchor:none;align-items:stretch}.classification-pager{display:contents}.classification-side{grid-row:1;min-width:0}.classification-previous{grid-column:1}.classification-next{grid-column:3}.classification-side button{position:sticky;top:calc(50vh - 24px);width:46px;height:48px;padding:0;font-size:1.5rem;box-shadow:0 3px 12px #12345318}.classification-cards>.classification-card{grid-column:2;grid-row:1;min-width:0;align-self:start}.classification-cards>.empty,.classification-cards>p{grid-column:1/-1}@media(max-width:600px){.classification-cards{grid-template-columns:36px minmax(0,1fr) 36px;gap:5px}.classification-side button{width:36px}.classification-card{padding:16px 10px}}

.question-marks{display:block;text-align:right;margin-top:12px;font-size:.9375rem;font-weight:600;color:var(--navy);line-height:1.5}

.options.letter-options{grid-template-columns:repeat(2,minmax(0,1fr));width:100%;max-width:none;gap:16px}.letter-options .option{justify-content:center;text-align:center;min-height:84px;padding:20px;font-weight:700;font-size:1.375rem;border-radius:8px}

/* One navigation bar for the student platform and teacher question bank. */
.shell.chemex-shell{display:block}.chemex-header{display:flex;flex-wrap:wrap;align-items:center;gap:16px 28px;background:var(--navy);color:#fff;padding:18px 28px}.chemex-header .brand{flex-shrink:0}.chemex-nav{display:flex;flex-wrap:wrap;align-items:center;gap:6px;flex:1}.chemex-header .nav-button{padding:11px 14px}.chemex-account{position:relative;margin-left:auto}.chemex-account summary{cursor:pointer;padding:12px;border:1px solid #58718a;border-radius:8px;list-style:none}.chemex-account summary::-webkit-details-marker{display:none}.chemex-account-menu{position:absolute;right:0;top:calc(100% + 8px);z-index:30;display:grid;gap:12px;min-width:220px;padding:18px;border:1px solid var(--line);border-radius:10px;background:#fff;color:var(--navy);box-shadow:0 8px 24px #12345326}.chemex-account-menu a{color:var(--navy)}.chemex-header summary:focus-visible{outline:3px solid #edc578;outline-offset:3px}@media(max-width:800px){.chemex-header{padding:16px;gap:12px}.chemex-header .brand{font-size:.875rem}.chemex-header .brand img{width:32px;height:32px}.chemex-nav{order:3;flex-basis:100%;gap:4px}.chemex-header .nav-button{padding:10px 12px}.chemex-account summary{font-size:.875rem;max-width:180px;overflow-wrap:anywhere}}

.chemex-account>summary{color:#fff}

.brand-home{color:inherit;text-decoration:none;border-radius:6px}.brand-title{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.brand-beta{display:inline-block;padding:3px 7px;border-radius:5px;background:#fff0bd;color:#654c0a;font-size:.625rem;font-weight:750;line-height:1.3;letter-spacing:.04em;text-transform:uppercase}.brand-home:hover .brand-title{text-decoration:underline;text-underline-offset:4px}

#staff-password[hidden]{display:none!important}