.sn-library-sentinel { height: 1px; margin-top: 27px; pointer-events: none; }
.sn-library-toolbar { position: sticky; top: 0; z-index: 8; padding: 8px 0 0; background: #f3f6f3; }
.sn-library-toolbar .search-row { margin: 0 0 10px; }
.sn-library-toolbar .search-row input { width: min(530px, 55%); }
.sn-library-toolbar .sc-category-nav { margin: 0; padding: 0 0 16px; }
.sn-library-toolbar.is-compact { display: flex; align-items: center; gap: 14px; padding: 10px 0; border-bottom: 1px solid #d9e4e1; box-shadow: 0 8px 12px #1839420a; }
.sn-library-toolbar.is-compact .search-row { flex: 1 1 270px; min-width: 170px; margin: 0; }
.sn-library-toolbar.is-compact .search-row input { width: 100%; min-height: 40px; padding: 10px 12px; font-size: 12px; }
.sn-library-toolbar.is-compact .local-badge { display: none; }
.sn-library-toolbar.is-compact .student-catalog-navigation { flex: 0 1 auto; min-width: 0; }
.sn-library-toolbar.is-compact .sc-category-nav { padding: 0; gap: 5px; flex-wrap: nowrap; overflow-x: auto; }
.sn-library-toolbar.is-compact .sc-nav-button { flex: none; white-space: nowrap; padding: 8px 11px; }
.sn-model-picker { width: min(660px, calc(100% - 30px)); }
.sn-model-picker .section-heading { margin-bottom: 12px; }
.sn-model-picker .sn-picker-description { font-size: 12px; color: #596f76; line-height: 1.8; margin: 0 0 14px; }
.sn-picker-search { width: 100%; font-size: 16px; margin-bottom: 10px; }
.sn-picker-list { max-height: min(49vh, 440px); overflow: auto; padding: 0 3px 0 0; }
.sn-picker-group { margin: 14px 0 18px; }
.sn-picker-group h3 { color: #087f82; font-size: 12px; margin-bottom: 8px; }
.sn-picker-option { display: flex; align-items: center; justify-content: space-between; gap: 15px; width: 100%; text-align: left; margin: 6px 0; padding: 12px; }
.sn-picker-option span { font-size: 13px; line-height: 1.6; }
.sn-picker-option small { max-width: 45%; text-align: right; color: #596f76; font-size: 10px; line-height: 1.6; }
.sn-picker-confirmation { border: 1px solid #c2dbce; border-radius: 10px; padding: 13px; background: #edf6ef; margin-top: 12px; }
.sn-model-picker .sn-picker-confirmation p { margin: 0 0 10px; font-size: 12px; line-height: 1.8; }
.sn-picker-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.sn-picker-actions button { font-size: 12px; }
.sn-model-picker .sn-picker-message { font-size: 12px; color: #88502c; margin: 8px 0 0; }
.sn-picker-empty { color: #596f76; font-size: 13px; padding: 15px 0; }
@media (max-width: 720px) {
  .sn-library-sentinel { margin-top: 18px; }
  .sn-library-toolbar { padding-top: 8px; }
  .sn-library-toolbar .search-row input { width: 100%; font-size: 16px; padding: 12px; }
  .sn-library-toolbar .local-badge { margin: 8px 0; font-size: 10px; }
  .sn-library-toolbar .sc-category-nav { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 10px; }
  .sn-library-toolbar .sc-nav-button { flex: none; white-space: nowrap; }
  .sn-library-toolbar.is-compact { display: block; padding: 8px 0 0; }
  .sn-library-toolbar.is-compact .search-row { margin-bottom: 8px; }
  .sn-library-toolbar.is-compact .search-row input { font-size: 16px; min-height: 40px; }
  .sn-library-toolbar.is-compact .sc-category-nav { padding-bottom: 8px; }
  .sn-picker-list { max-height: 42dvh; }
  .sn-picker-option { display: block; }
  .sn-picker-option small { display: block; max-width: none; text-align: left; margin-top: 3px; }
  .sn-picker-actions { display: grid; grid-template-columns: 1fr; }
  .sn-picker-actions button { width: 100%; }
}
.sn-picker-group-heading,.sn-model-heading{display:flex;gap:12px;align-items:center;margin:14px 0}.sn-picker-group-heading h3,.sn-model-heading h3{margin:0;line-height:1.5}
.sn-model-description{font-size:14px;line-height:1.8}.sn-model-scope{margin:14px 0;padding:12px 14px;background:var(--page);border:1px solid var(--line);border-radius:8px}.sn-model-scope summary{cursor:pointer;font-weight:600}.sn-model-scope small{display:block;color:var(--muted);overflow-wrap:anywhere;line-height:1.7}
.sn-model-picker .sn-picker-search[hidden],.sn-model-picker .sn-picker-list[hidden],.sn-model-picker .sn-picker-description[hidden]{display:none}

.classroom-picker-list{max-height:min(60dvh,480px);overflow:auto}
.classroom-picker-list h3{font-size:16px;margin:0}
.classroom-picker-subjects{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-top:12px}
.classroom-picker-subjects button,.classroom-picker-heading button{min-height:44px}
.classroom-picker-heading{display:flex;align-items:center;gap:12px}
.classroom-picker-chapter{display:grid;gap:6px;padding:8px 2px}
.classroom-picker-chapter h4{margin:0;color:var(--muted)}
.classroom-details{width:min(100% - 28px,780px);margin:24px auto}
.classroom-details-actions,.classroom-details-heading{display:flex;align-items:center;flex-wrap:wrap;gap:10px}
.classroom-details-actions{margin-bottom:12px}
.classroom-details article{padding:clamp(16px,4vw,32px);border:1px solid var(--line);border-radius:var(--radius-panel);background:var(--surface)}
.classroom-details h1{margin:0;font-size:24px}
.classroom-details h2{margin:16px 0 6px;font-size:18px}
.classroom-details h2:empty{display:none}
.classroom-details p{margin:8px 0 0;line-height:1.65;white-space:pre-line;overflow-wrap:anywhere}
#modelDetailsNote{color:var(--muted)}
#modelDetailsVariants:not(:empty){margin-top:16px}
#experimentVariants:not(:empty){flex:none;padding:6px 16px;background:var(--surface);border-bottom:.5px solid var(--line)}
/* The shared selector replaces the existing template-link rows when it has this family. */
#workbench:has(#experimentVariants:not(:empty)) .k01-variants{display:none}
.classroom-variants{display:flex;align-items:center;flex-wrap:wrap;gap:6px 10px;font-size:14px}
.classroom-variants select{width:min(100%,440px);min-width:0;min-height:36px;text-overflow:ellipsis}
@media(max-width:719px){.classroom-variants select{font-size:16px}}