/* Exercise Builder v4.2 — single workspace + fixed assignment scrolling. */
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.builder-card{padding:0;overflow:hidden}.builder-card>.editor-source-head{padding:20px 22px;border-bottom:1px solid var(--border,#d9dee8);display:flex;justify-content:space-between;align-items:center;gap:16px}.builder-card>.editor-source-head h3{margin:0 0 4px}.builder-card .editor-source-tabs{margin:0;flex:none}.builder-workspace{display:grid;grid-template-columns:190px minmax(0,1fr);min-height:620px}.builder-folders{padding:14px 10px;border-right:1px solid var(--border,#d9dee8);background:color-mix(in srgb,var(--card,#fff) 88%,var(--bg,#f5f7fb));display:flex;flex-direction:column;gap:5px}.builder-folders.is-hidden{display:none}.builder-workspace:has(.builder-folders.is-hidden){grid-template-columns:1fr}.builder-folder,.builder-tab{display:flex;align-items:center;gap:7px;min-width:0;border:0;background:transparent;color:inherit}.builder-folder{width:100%;padding:9px 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.builder-question-pane{grid-column:3}.builder-pane-label{font-weight:700;margin-bottom:8px}.builder-rich-editor{min-height:430px;padding:16px;border:1px solid var(--border,#ccd3df);border-radius:10px;background:var(--card,#fff);outline:none;white-space:pre-wrap;line-height:1.55;overflow:auto}.builder-rich-editor:empty:before{content:attr(data-placeholder);color:#98a2b3}.builder-rich-editor:focus,.builder-paste:focus{border-color:#7395e8;box-shadow:0 0 0 3px #2457e614}.builder-shortcuts{font-size:12px;color:var(--muted,#667085);margin-top:6px}.builder-common-fields{display:grid;grid-template-columns:1fr 1.4fr;gap:8px;margin-bottom:10px}.builder-import-head{display:flex;align-items:end;justify-content:space-between;gap:12px;margin-bottom:8px}.builder-import-head label{min-width:210px}.builder-paste{width:100%;min-height:170px;resize:vertical;font:inherit;line-height:1.45}.builder-matching-paste{display:grid;grid-template-columns:1fr 1fr;gap:8px}.builder-import-actions{display:flex;align-items:center;gap:8px;margin:10px 0 16px}.builder-blocks{display:flex;flex-direction:column;gap:10px}.builder-block-card{border:1px solid var(--border,#d9dee8);border-radius:11px;background:var(--card,#fff);overflow:hidden}.builder-block-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:9px 11px;border-bottom:1px solid var(--border,#e1e5ec)}.builder-block-body{padding:10px 12px}.builder-question-row{display:grid;grid-template-columns:34px minmax(0,1fr);gap:8px;padding:9px 0}.builder-question-row+.builder-question-row{border-top:1px solid var(--border,#e6e9ef)}.builder-q-number{font-weight:700;padding-top:7px}.builder-q-content input{width:100%;border:0;border-bottom:1px solid transparent;border-radius:0;padding:6px 4px;background:transparent}.builder-q-content input:focus{border-bottom-color:var(--primary,#2457e6);box-shadow:none}.builder-option-edit{display:grid;grid-template-columns:30px 1fr 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10px;text-align:center;color:var(--muted,#667085)}.builder-dragging{opacity:.45}.builder-drag-over{box-shadow:inset 0 0 0 2px var(--primary,#2457e6)}
.editor-meta-card #layoutSetting{display:none!important}.exercise-folder-shell{display:grid;grid-template-columns:190px minmax(0,1fr);min-height:0}.exercise-folder-shell.one-folder{grid-template-columns:1fr}.exercise-folder-shell.folders-collapsed{grid-template-columns:42px minmax(0,1fr)}.exercise-folder-sidebar{display:flex;flex-direction:column;gap:5px;padding:10px;border-right:1px solid var(--border,#d9dee8);min-height:0;overflow-y:auto}.exercise-folder-sidebar button{border:0;background:transparent;text-align:left;padding:9px 10px;border-radius:8px;color:inherit}.exercise-folder-sidebar button.active{background:var(--soft,#edf2fb);font-weight:700}.exercise-folder-sidebar.collapsed{padding:6px}.exercise-folder-sidebar.collapsed .exercise-folder-name{display:none}.exercise-folder-toggle{text-align:center!important;padding:6px!important}.exercise-folder-content{min-width:0;min-height:0;display:flex;flex-direction:column;overflow:hidden}.exercise-tabs-nav{flex:0 0 auto;display:flex;gap:5px;align-items:flex-end;padding:3px 10px 0;border-bottom:1px solid #dfe5ee;background:#f5f7fb;overflow-x:auto;overflow-y:hidden;white-space:nowrap}.exercise-tabs-panels{flex:1 1 auto;min-height:0;overflow:hidden}.exercise-folder-content .exercise-tabs-nav{margin-top:0}.builder-student-block-head h3{margin:14px 0 6px}.builder-student-block-head .instructions{margin:0 0 10px}
body.exercise-focus #studentPreview>.exercise-folder-shell{width:100%;height:100%;min-height:0;overflow:hidden}body.exercise-focus .exercise-folder-shell .exercise-tabs-panels{height:100%;min-height:0}body.exercise-focus .exercise-folder-shell .exercise-tab-panel.active{display:block;height:100%;min-height:0;overflow-y:auto;overscroll-behavior:contain}body.exercise-focus .exercise-folder-shell .exercise-tab-panel[data-tab-layout="split_reading"].active{overflow:hidden;padding:0}body.exercise-focus .exercise-folder-shell .exercise-tab-panel[data-tab-layout="split_reading"]>.reading-shell{height:100%!important;min-height:0!important;margin:0!important}body.exercise-focus .exercise-folder-shell .reading-passage,body.exercise-focus .exercise-folder-shell .reading-question-scroll{min-height:0!important;overflow-y:auto!important}
html[data-theme="dark"] .builder-rich-editor,html[data-theme="dark"] .builder-block-card{background:#111b2b;color:#e8eef8}.builder-card #builderSource{font-family:inherit}
@media(max-width:900px){.builder-workspace{grid-template-columns:150px minmax(0,1fr)}.builder-editing-area.is-split{grid-template-columns:1fr}.builder-editing-area.is-split:before{display:none}.builder-editing-area.is-split .builder-passage-pane,.builder-editing-area.is-split .builder-question-pane{grid-column:1}.builder-editing-area.is-split .builder-question-pane{grid-row:2}.builder-rich-editor{min-height:280px}}
@media(max-width:650px){.builder-page-topbar{grid-template-columns:auto minmax(120px,1fr) auto!important}.builder-page-topbar .editor-status-badge,.builder-page-topbar>#saveState{display:none}.builder-page-topbar .editor-topbar-actions{grid-column:1/-1;width:100%;justify-content:flex-end}.builder-workspace{grid-template-columns:1fr}.builder-folders{border-right:0;border-bottom:1px solid var(--border,#d9dee8);flex-direction:row;overflow:auto}.builder-folders.is-hidden{display:none}.builder-common-fields,.builder-matching-paste{grid-template-columns:1fr}.builder-tab-tools{align-items:flex-start;flex-direction:column}.builder-card>.editor-source-head{align-items:flex-start;flex-direction:column}.exercise-folder-shell{grid-template-columns:1fr}.exercise-folder-sidebar{flex-direction:row;overflow:auto;border-right:0;border-bottom:1px solid var(--border,#d9dee8)}}