/* Teacher workspace only. Student/player styles remain in academic_clarity.css. */
.edu-library-shell, .edu-materials-detail-page {
    --edu-library-bg: #f6f7f9;
    --edu-library-panel: #fff;
    --edu-library-text: #242630;
    --edu-library-muted: #616571;
    --edu-library-faint: #737885;
    --edu-library-border: #e0e2e8;
    --edu-library-soft: #f0f1f5;
    --edu-library-primary: #6844c6;
    --edu-library-primary-dark: #4c309c;
    --edu-library-primary-soft: #f1edfa;
    --edu-library-error: #b4233f;
    --edu-library-error-soft: #fff1f3;
    --edu-mat-primary: var(--edu-library-primary);
    --edu-mat-primary-strong: var(--edu-library-primary-dark);
    --edu-mat-soft: var(--edu-library-soft);
    --edu-mat-border: var(--edu-library-border);
    --edu-mat-border-soft: var(--edu-library-border);
    --edu-mat-faint: var(--edu-library-faint);
    background: var(--edu-library-bg);
    color: var(--edu-library-text);
    padding: 32px 24px 64px;
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
    letter-spacing: 0;
}
/* Local box sizing fix for the existing shared service host. */
.service-left-rail-shell, .service-left-rail-host, .service-left-rail-layout, .service-left-rail-main { box-sizing: border-box; max-width: 100%; min-width: 0; }
.edu-library-shell *, .edu-materials-detail-page * { box-sizing: border-box; }
.edu-library-page { width: min(100%, 1180px); margin-inline: auto; }
.edu-library-shell h1, .edu-materials-detail-page h1 { margin: 0; font-size: 28px; font-weight: 700; line-height: 1.4; letter-spacing: 0; overflow-wrap: anywhere; }
.edu-library-shell h2, .edu-materials-detail-page h2 { font-size: 20px; font-weight: 600; line-height: 1.5; letter-spacing: 0; }
.edu-library-shell h3 { margin: 0; font-size: 18px; font-weight: 600; line-height: 1.5; }
.edu-library-shell :is(button,input,select,textarea), .edu-materials-detail-page :is(button,input,select,textarea) { font: inherit; border-radius: 8px; }
.edu-library-shell :is(a,button,input,select,textarea,summary):focus-visible, .edu-materials-detail-page :is(a,button,input,select,textarea,summary):focus-visible { outline: 3px solid #b9a4ef; outline-offset: 3px; }
.edu-library-shell :is(button,summary), .edu-materials-detail-page :is(button,summary) { cursor: pointer; }
.edu-library-shell button:disabled, .edu-materials-detail-page button:disabled { color: #737885; background: #eceef2; border: 1px solid #d9dde4; border-radius: 8px; padding: 8px 16px; min-height: 44px; cursor: not-allowed; }
.edu-library-header { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 24px; padding-bottom: 24px; border-bottom: 1px solid var(--edu-library-border); }
.edu-library-header__identity { display: flex; align-items: center; flex-wrap: wrap; gap: 32px; }
.edu-library-header__tabs { display: flex; gap: 8px; }
.edu-library-header__tabs a { padding: 12px 16px; min-height: 44px; border-radius: 8px; color: var(--edu-library-muted); text-decoration: none; font-size: 14px; font-weight: 600; }
.edu-library-header__tabs a[aria-current] { color: var(--edu-library-primary-dark); background: var(--edu-library-primary-soft); }
.edu-library-header__tabs a:hover { background: var(--edu-library-soft); }
.edu-action-primary, .edu-action-secondary, .edu-action-quiet, .edu-materials-primary-action, .edu-materials-access-secondary-action, .edu-materials-access-copy-button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; border: 1px solid var(--edu-library-border); border-radius: 8px; padding: 8px 16px; font-size: 14px; font-weight: 600; text-decoration: none; line-height: 1.5; background: #fff; color: var(--edu-library-text); }
.edu-action-primary, .edu-materials-primary-action { background: var(--edu-library-primary); border-color: var(--edu-library-primary); color: #fff; }
.edu-action-primary:hover, .edu-materials-primary-action:hover { background: var(--edu-library-primary-dark); border-color: var(--edu-library-primary-dark); }
.edu-action-secondary:hover, .edu-materials-access-secondary-action:hover, .edu-materials-access-copy-button:hover { background: var(--edu-library-soft); }
.edu-action-quiet { border-color: transparent; background: transparent; color: var(--edu-library-muted); }
.edu-library-main { margin-top: 24px; }
.edu-library-context { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 16px; color: var(--edu-library-muted); font-size: 14px; }
.edu-library-context a { color: var(--edu-library-primary-dark); }
.edu-related-spaces { position: relative; }
.edu-related-spaces summary { padding: 8px; min-height: 44px; display: flex; align-items: center; gap: 8px; }
.edu-related-spaces summary::after { content: '⌄'; }
.edu-related-spaces nav { position: absolute; right: 0; top: 100%; width: min(320px, 80vw); z-index: 20; display: grid; gap: 4px; padding: 8px; border: 1px solid var(--edu-library-border); border-radius: 12px; background: #fff; box-shadow: 0 8px 24px #24263012; }
.edu-related-spaces a { display: flex; align-items: center; min-height: 44px; padding: 8px 16px; color: var(--edu-library-text); text-decoration: none; border-radius: 8px; overflow-wrap: anywhere; }
.edu-related-spaces a:hover { background: var(--edu-library-soft); }
.edu-library-discovery { border-bottom: 1px solid var(--edu-library-border); padding-bottom: 16px; }
.edu-library-search { display: flex; gap: 8px; flex-wrap: wrap; }
.edu-library-search input { flex: 1; min-width: 160px; }
.edu-library-search button, .edu-library-filter-grid button { border: 1px solid var(--edu-library-border); border-radius: 8px; background: #fff; padding: 8px 24px; min-height: 44px; font-weight: 600; }
.edu-library-search select { height: 100%; }
.edu-library-search :is(input,select), .edu-library-filter-grid select, .edu-field :is(input,textarea), .edu-materials-input, .game-builder-input { min-height: 44px; border: 1px solid var(--edu-library-border); border-radius: 8px; background: #fff; color: var(--edu-library-text); padding: 8px 12px; max-width: 100%; }
.edu-library-more-filters > summary { display: inline-flex; align-items: center; min-height: 44px; gap: 8px; margin-top: 8px; color: var(--edu-library-muted); font-size: 14px; }
.edu-library-filter-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)) auto; gap: 16px; max-width: 880px; align-items: end; padding: 16px 0; }
.edu-library-filter-grid label { display: grid; gap: 8px; font-size: 14px; }
.edu-library-active-filter { display: inline-flex; padding: 8px 0; color: var(--edu-library-primary-dark); font-size: 14px; }
.edu-library-results-head { display: flex; justify-content: space-between; align-items: center; margin: 24px 0 16px; }
.edu-library-results-head h2 { margin: 0; }
.edu-library-results-head > span { font-size: 14px; color: var(--edu-library-muted); }
.edu-materials-card-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(min(100%,260px),1fr)); gap: 24px; }
@media(min-width: 1280px) { .edu-materials-card-grid { grid-template-columns: repeat(3,minmax(0,1fr)); } }
.edu-materials-board-card { display: flex; flex-direction: column; min-width: 0; overflow: hidden; border: 1px solid var(--edu-library-border); border-radius: 12px; background: #fff; }
.edu-materials-board-card:hover { border-color: #b9a4ef; }
.edu-materials-preview-thumb { display: grid; position: relative; width: 100%; aspect-ratio: 16 / 9; overflow: hidden; place-items: center; background: var(--edu-library-soft); color: var(--edu-library-muted); text-decoration: none; }
.edu-materials-preview-thumb img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.edu-thumbnail-fallback { font-size: 14px; }
.edu-materials-card-body { padding: 16px; display: flex; flex-direction: column; flex: 1; gap: 8px; }
.edu-materials-card-taxonomy, .edu-materials-card-byline { color: var(--edu-library-muted); font-size: 14px; min-height: 21px; }
.edu-materials-card-title, .edu-materials-card-summary { display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; overflow-wrap: anywhere; }
.edu-materials-card-title { color: var(--edu-library-text); text-decoration: none; }
.edu-materials-card-summary { color: var(--edu-library-muted); font-size: 14px; margin: 0; line-height: 1.6; }
.edu-materials-card-byline { margin-top: auto; padding-top: 8px; }
.edu-materials-card-action { display: flex; align-items: center; justify-content: space-between; min-height: 44px; margin-top: 8px; border-top: 1px solid var(--edu-library-border); color: var(--edu-library-primary-dark); text-decoration: none; font-size: 14px; font-weight: 600; }
.edu-library-empty { text-align: center; padding: 64px 24px; border: 1px dashed var(--edu-library-border); border-radius: 12px; }
.edu-library-empty p { color: var(--edu-library-muted); margin: 8px 0 24px; }
.edu-library-empty > a { color: var(--edu-library-primary-dark); }
.edu-empty-actions { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; }
.edu-library-pagination { display: flex; justify-content: center; align-items: center; gap: 24px; margin-top: 32px; font-size: 14px; }
.edu-library-pagination a { padding: 12px; color: var(--edu-library-primary-dark); }
/* Creation: one constrained form, shared controls, no second navigation bar. */
.edu-create-page, .edu-library-creation-desktop { width: min(100%,880px); margin: 0 auto; }
.edu-create-heading { margin: 0 0 32px; }
.edu-create-back, .edu-materials-detail-back { display: inline-flex; align-items: center; min-height: 44px; margin-bottom: 16px; color: var(--edu-library-muted); text-decoration: none; font-size: 14px; }
.edu-create-heading p { color: var(--edu-library-muted); margin-top: 8px; }
.edu-create-page:has(.edu-creation-choices) { max-width: 480px; }
.edu-creation-choices { display: grid; gap: 16px; }
.edu-creation-choices > a { display: grid; grid-template-columns: 48px minmax(0,1fr) auto; align-items: center; gap: 24px; background: #fff; border: 1px solid var(--edu-library-border); border-radius: 12px; padding: 24px; color: var(--edu-library-text); text-decoration: none; }
.edu-creation-choices > a:hover { border-color: var(--edu-library-primary); }
.edu-choice-icon { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 8px; background: var(--edu-library-primary-soft); color: var(--edu-library-primary); font-size: 24px; }
.edu-creation-choices strong, .edu-creation-choices small { display: block; }
.edu-creation-choices strong { font-size: 18px; font-weight: 600; }
.edu-creation-choices small { margin-top: 8px; font-size: 14px; color: var(--edu-library-muted); }
.edu-create-card, .game-builder-panel { background: #fff; padding: 32px; border: 1px solid var(--edu-library-border); border-radius: 12px; }
.edu-flow-status { display: flex; justify-content: space-between; gap: 16px; font-size: 14px; color: var(--edu-library-muted); }
.edu-flow-progress { height: 4px; margin: 16px 0 32px; background: var(--edu-library-soft); overflow: hidden; border-radius: 8px; }
.edu-flow-progress > span { display: block; height: 100%; width: 33.333%; background: var(--edu-library-primary); transition: width 180ms; }
.edu-flow-step__label { color: var(--edu-library-muted); font-size: 14px; margin-bottom: 8px; }
.edu-flow-step h2 { margin: 0 0 24px; }
.edu-field { display: grid; gap: 8px; margin-top: 16px; }
.edu-field > span { font-size: 14px; font-weight: 600; }
.edu-field :is(input,textarea), .edu-materials-input, .game-builder-input { width: 100%; }
.edu-code-input, .edu-prompt-box { resize: vertical; min-height: 280px; font-family: ui-monospace,monospace; font-size: 14px; line-height: 1.6; }
.edu-prompt-actions, .edu-flow-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 16px; }
.edu-prompt-actions { margin-top: 16px; }
.edu-flow-actions { justify-content: space-between; margin-top: 32px; border-top: 1px solid var(--edu-library-border); padding-top: 24px; }
.edu-flow-actions--end { justify-content: flex-end; }
.edu-inline-status { min-height: 24px; margin-top: 8px; color: var(--edu-library-muted); font-size: 14px; }
.edu-form-error { background: var(--edu-library-error-soft); color: var(--edu-library-error); padding: 12px; border-radius: 8px; margin: 8px 0; }
.edu-field [aria-invalid=true] { border-color: var(--edu-library-error); }
.edu-save-summary { display: flex; flex-wrap: wrap; gap: 16px; border-top: 1px solid var(--edu-library-border); margin-top: 24px; padding-top: 16px; }
.edu-save-summary span { color: var(--edu-library-muted); font-size: 14px; }
.edu-save-summary strong { overflow-wrap: anywhere; }
.edu-public-note { margin-top: 24px; padding: 16px; background: var(--edu-library-soft); border-radius: 8px; font-size: 14px; color: var(--edu-library-muted); }
.edu-public-note p { margin: 8px 0 0; }
.edu-source-choices { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 16px; }
.edu-source-choice { display: flex; gap: 16px; align-items: center; border: 1px solid var(--edu-library-border); border-radius: 8px; padding: 24px; cursor: pointer; }
.edu-source-choice:has(input:checked) { border-color: var(--edu-library-primary); background: var(--edu-library-primary-soft); }
.edu-source-choice strong, .edu-source-choice small { display: block; }
.edu-source-choice small { color: var(--edu-library-muted); margin-top: 8px; }
.edu-help-dialog { border: 1px solid #e0e2e8; border-radius: 12px; padding: 24px; width: min(560px,calc(100vw - 32px)); color: #242630; background: #fff; }
.edu-help-dialog::backdrop { background: #24263066; }
.edu-help-dialog__header { display: flex; justify-content: space-between; gap: 16px; margin-bottom: 24px; }
.edu-help-dialog ol { list-style: decimal; padding-left: 24px; margin-bottom: 24px; }
.edu-help-dialog li { margin-bottom: 16px; }
.edu-dialog-close { width: 44px; height: 44px; border-radius: 8px; background: #f0f1f5; font-size: 24px; }
/* Detail keeps the existing runtime and form hooks, with one visual owner. */
.edu-detail-columns { display: grid; grid-template-columns: minmax(0,1fr) minmax(280px,340px); gap: 24px; align-items: start; }
.edu-materials-panel { background: #fff; border: 1px solid var(--edu-library-border); border-radius: 12px; box-shadow: none; }
.edu-materials-detail-header { padding: 0 0 24px; background: transparent; border: 0; border-bottom: 1px solid var(--edu-library-border); border-radius: 0; }
.edu-materials-detail-byline { color: var(--edu-library-muted); font-size: 14px; margin-bottom: 8px; }
.edu-materials-summary-text { display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; overflow: hidden; }
.edu-materials-preview-stage { touch-action: pan-y; }
.edu-materials-live-frame { max-width: 1024px; margin-inline: auto; }
.edu-materials-share-card { color: var(--edu-library-text); }
.edu-materials-access-header { margin-bottom: 24px; }
.edu-materials-access-eyebrow, .edu-materials-access-label { font-size: 14px; color: var(--edu-library-muted); }
.edu-materials-access-title { margin: 8px 0 0; }
.edu-materials-access-panel { display: flex; align-items: center; flex-wrap: wrap; gap: 16px; padding: 16px 0; border-block: 1px solid var(--edu-library-border); }
.edu-materials-access-details { flex: 1; min-width: 0; }
.edu-materials-access-code-row { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.edu-materials-share-code-compact { font-size: 28px; font-weight: 700; font-variant-numeric: tabular-nums; letter-spacing: .04em; line-height: 1.3; }
.edu-materials-access-qr { width: 104px; height: 104px; object-fit: contain; }
.edu-materials-access-url-group { margin-top: 16px; }
.edu-materials-access-url { font-size: 14px; overflow-wrap: anywhere; margin-top: 8px; }
.edu-materials-access-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.edu-materials-access-secondary-action { font-size: 14px; padding-inline: 12px; }
.edu-materials-access-feedback { min-height: 24px; margin-top: 8px; font-size: 14px; color: var(--edu-library-muted); }
.edu-copy-feedback { opacity: 0; }
.edu-copy-feedback[data-visible=true] { opacity: 1; }
.edu-materials-recent-sessions { margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--edu-library-border); }
.edu-materials-recent-session { display: flex; justify-content: space-between; gap: 8px; padding: 12px 0; font-size: 14px; }
.edu-materials-technical-details { padding: 16px 24px; }
.edu-materials-technical-details > summary, .edu-management > summary { min-height: 44px; display: flex; align-items: center; justify-content: space-between; gap: 16px; font-weight: 600; }
.edu-management { max-width: 880px; margin: 32px auto 0; border-top: 1px solid var(--edu-library-border); }
.edu-management > summary { padding: 16px 0; }
.edu-management > summary span { font-size: 14px; font-weight: 400; color: var(--edu-library-muted); }
.edu-management > section, .edu-management > div { margin-bottom: 24px; }
.edu-management form button { max-width: 480px; }
.edu-session-options { padding: 8px 0; }
.edu-session-options summary { min-height: 44px; display: flex; align-items: center; font-size: 14px; }
.edu-session-options label { margin: 8px 0; }
.edu-materials-share-card select { color: var(--edu-library-text); background: #fff; border: 1px solid var(--edu-library-border); }
.edu-materials-share-card :is(label,option) { color: var(--edu-library-text); }
#edit-form, #game-question-editor, #metadata-form { scroll-margin-top: calc(var(--main-nav-height, 0px) + 24px); }
.game-builder-source-choice, .game-builder-template-choice { position: relative; display: flex; flex-direction: column; gap: 8px; border: 1px solid var(--edu-library-border); border-radius: 12px; background: #fff; padding: 24px; cursor: pointer; }
.game-builder-source-choice input, .game-builder-template-choice input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.game-builder-source-choice:has(input:checked), .game-builder-template-choice:has(input:checked) { border-color: var(--edu-library-primary); background: var(--edu-library-primary-soft); }
.game-builder-source-choice:focus-within, .game-builder-template-choice:focus-within { outline: 3px solid #b9a4ef; outline-offset: 3px; }
.game-builder-source-choice__icon { font-size: 24px; }
.game-builder-template-choice span { color: var(--edu-library-muted); }
.game-builder-progress { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 8px; }
.game-builder-progress__item { height: 4px; background: var(--edu-library-soft); border-radius: 8px; }
.game-builder-progress__item[data-active=true] { background: var(--edu-library-primary); }
.game-builder-preview { border: 1px solid var(--edu-library-border); border-radius: 12px; background: var(--edu-library-soft); }
.edu-mobile-only { display: none; }
@media(max-width: 1100px) { .edu-detail-columns { grid-template-columns: minmax(0,1fr); } }
@media(max-width: 767px) {
    .edu-library-shell, .edu-materials-detail-page { padding: 24px 16px 48px; }
    .edu-library-header { align-items: start; gap: 16px; }
    .edu-library-header__identity { width: 100%; gap: 16px; }
    .edu-library-header__tabs { width: 100%; }
    .edu-library-filter-grid, .edu-source-choices { grid-template-columns: minmax(0,1fr); }
    .edu-library-search input { flex-basis: 100%; }
    .edu-sort-label { flex: 1; }
    .edu-sort-label select { width: 100%; }
    .edu-library-shell .edu-desktop-only, .edu-materials-detail-page .edu-desktop-only, .edu-library-creation-desktop, .edu-materials-detail-page form { display: none; }
    .edu-mobile-only { display: block; }
    .edu-mobile-only small { display: block; margin-top: 8px; font-size: 14px; color: var(--edu-library-muted); }
    .edu-mobile-notice { padding: 16px; border: 1px solid var(--edu-library-border); border-radius: 12px; background: #fff; }
    .edu-mobile-notice p { margin-top: 8px; font-size: 14px; color: var(--edu-library-muted); }
    .edu-mobile-notice a { display: inline-flex; align-items: center; min-height: 44px; margin-top: 8px; color: var(--edu-library-primary-dark); }
}
@media(prefers-reduced-motion: reduce) { .edu-flow-progress > span { transition: none; } }
.edu-library-shell p, .edu-materials-detail-page p { font-weight: 400; }
.edu-detail-sidebar { display: grid; gap: 24px; }
.edu-materials-detail-page [data-preview-root] { background: var(--edu-library-soft); padding: 8px; border: 0; }
.edu-materials-detail-page [data-preview-stage] { background: #fff; padding: 8px; border: 1px solid var(--edu-library-border); border-radius: 8px; }
.edu-materials-detail-page [data-preview-iframe] { box-shadow: none; }
.edu-materials-detail-page .edu-materials-live-frame { border-radius: 8px; }
@media(max-width:767px) {
    .edu-library-header__identity { gap: 8px; }
    .edu-library-header > .edu-mobile-only { display: flex; align-items: center; gap: 8px; }
    .edu-library-header > .edu-mobile-only small { margin-top: 0; }
    .edu-library-search { flex-wrap: nowrap; }
    .edu-library-search input { flex-basis: auto; min-width: 0; }
    .edu-library-search:has(select) { flex-wrap: wrap; }
    .edu-library-search:has(select) input { flex-basis: 100%; }
    .edu-library-context { margin-bottom: 8px; }
}