/*
 * CourseOS system UI
 * One visual contract for the platform, institution, preview, training and
 * classroom workspaces. Feature styles may define layout, but they do not
 * define a second visual language.
 */
:root {
  --cos-primary: #3f7bf3;
  --cos-primary-strong: #2f63d6;
  --cos-primary-soft: #eaf1ff;
  --cos-success: #2ba77d;
  --cos-success-soft: #e9f8f2;
  --cos-accent: #f39a68;
  --cos-accent-soft: #fff2ea;
  --cos-danger: #d95f70;
  --cos-canvas: #f4f7fb;
  --cos-surface: #ffffff;
  --cos-surface-soft: #f8faff;
  --cos-ink: #1e293b;
  --cos-ink-soft: #405069;
  --cos-muted: #7b879b;
  --cos-muted-soft: #a2aec0;
  --cos-line: #e2e8f2;
  --cos-line-strong: #d1dbea;
  --cos-radius: 12px;
  --cos-radius-sm: 9px;
  --cos-shadow-sm: 0 2px 10px rgba(30, 52, 88, .05);
  --cos-shadow: 0 12px 30px rgba(30, 52, 88, .08);
  --cos-shadow-lg: 0 24px 70px rgba(17, 34, 64, .18);
}

body.courseos-app {
  background: var(--cos-canvas);
  color: var(--cos-ink);
  font-family: "Noto Sans SC", "Manrope", "Microsoft YaHei", "Segoe UI", sans-serif;
}

.courseos-app,
.courseos-app * {
  letter-spacing: 0;
}

.courseos-app .app {
  grid-template-columns: 244px minmax(0, 1fr);
  height: 100vh;
  height: 100dvh;
  min-height: 0;
  overflow: hidden;
  background: var(--cos-canvas);
}

.courseos-app .sidebar,
.courseos-app .institution-side {
  background: var(--cos-surface);
  border-color: var(--cos-line);
}

.courseos-app .sidebar {
  padding: 20px 14px 14px;
  height: 100%;
  max-height: 100dvh;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior-y: contain;
}

/* The right pane owns scrolling; navigation stays in the viewport. */
.courseos-app .app > .main {
  height: 100%;
  min-height: 0;
  overflow: auto;
  scrollbar-gutter: stable;
  scroll-padding-top: 100px;
}

.courseos-app .app > .main > .topbar {
  position: sticky;
  top: 0;
  z-index: 35;
  background: var(--cos-surface);
}

/* Keep dashboard details readable alongside the larger summary numbers. */
.courseos-app .platform-ops-panel {
  font-size: 14px;
  line-height: 1.6;
}

.courseos-app .platform-ops-panel h3 {
  font-size: 16px;
  line-height: 1.5;
}

.courseos-app .platform-ops-panel > p,
.courseos-app .platform-ops-kpis span,
.courseos-app .platform-ops-kpis small,
.courseos-app .platform-work-item span,
.courseos-app .platform-activity-row span {
  font-size: 13px;
  line-height: 1.6;
  color: var(--cos-muted);
}

.courseos-app .platform-work-item b,
.courseos-app .platform-activity-row b {
  font-size: 14px;
  line-height: 1.6;
}

.courseos-app .platform-work-item button,
.courseos-app .platform-action-row button {
  font-size: 13px;
  line-height: 1.5;
}

.courseos-app .platform-work-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  font-size: 14px;
}

.courseos-app .platform-ops-panel .courseos-live-table th,
.courseos-app .platform-ops-panel .courseos-live-table td {
  padding: 13px 8px;
  font-size: 14px;
  line-height: 1.6;
}

.courseos-app .platform-ops-panel .courseos-live-table th {
  font-size: 13px;
  color: var(--cos-muted);
}

.courseos-app .platform-ops-panel .courseos-live-table small {
  font-size:13px;
  line-height: 1.6;
  color: var(--cos-muted) !important;
}

.courseos-app .platform-ops-panel .courseos-live-pill {
  font-size: 12px;
  line-height: 1.5;
}

.courseos-app .brand,
.courseos-app .institution-logo {
  padding: 0 10px 24px;
}

.courseos-app .brand-mark,
.courseos-app .institution-logo .brand-mark {
  width: 38px;
  height: 38px;
  border: 0;
  border-radius: 11px;
  background: var(--cos-primary);
  color: #fff;
  transform: none;
  box-shadow: 0 7px 16px rgba(63, 123, 243, .22);
}

.courseos-app .brand b,
.courseos-app .institution-logo b {
  color: var(--cos-ink);
  font-size: 17px;
}

.courseos-app .brand small,
.courseos-app .institution-logo small,
.courseos-app .section-label,
.courseos-app .institution-nav-label {
  color: var(--cos-muted-soft);
}

.courseos-app .section-label,
.courseos-app .institution-nav-label {
  padding: 13px 12px 6px;
  font-size: 10px;
  letter-spacing: .04em;
}

.courseos-app .nav {
  gap: 3px;
}

.courseos-app .nav button,
.courseos-app .institution-nav {
  min-height: 40px;
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--cos-ink-soft);
  transition: background .16s ease, border-color .16s ease, color .16s ease,
    box-shadow .16s ease;
}

.courseos-app .nav button {
  padding: 9px 12px;
  gap: 10px;
}

.courseos-app .sidebar .nav button > .icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 24px;
  width: 24px;
  height: 24px;
  font-size: 22px;
  line-height: 1;
}

.courseos-app .institution-nav {
  padding: 10px 12px;
}

.courseos-app .nav button:hover,
.courseos-app .institution-nav:hover {
  background: var(--cos-primary-soft);
  border-color: #d9e5ff;
  color: var(--cos-primary);
}

.courseos-app .nav button.active,
.courseos-app .institution-nav.active {
  background: var(--cos-primary);
  border-color: var(--cos-primary);
  color: #fff;
  font-weight: 700;
  box-shadow: 0 7px 16px rgba(63, 123, 243, .18);
}

.courseos-app .nav button.active .icon {
  color: #fff;
}

.courseos-app .side-bottom,
.courseos-app .institution-side {
  border-color: var(--cos-line);
}

.courseos-app .preview-institution {
  min-height: 40px;
  border: 1px solid #d9e5ff;
  border-radius: 10px;
  background: var(--cos-primary-soft);
  color: var(--cos-primary);
}

.courseos-app .preview-institution:hover {
  background: var(--cos-primary);
  color: #fff;
}

.courseos-app .main,
.courseos-app .institution-main {
  min-width: 0;
  background: var(--cos-canvas);
}

.courseos-app .topbar,
.courseos-app .institution-top {
  min-height: 72px;
  height: 72px;
  background: rgba(255, 255, 255, .96);
  border-color: var(--cos-line);
  box-shadow: 0 1px 0 rgba(63, 123, 243, .03);
  backdrop-filter: blur(12px);
}

.courseos-app .topbar {
  padding: 0 32px;
}

.courseos-app .institution-top {
  padding: 0 34px;
}

.courseos-app .crumb,
.courseos-app .top-kicker {
  color: var(--cos-muted);
}

.courseos-app .crumb strong,
.courseos-app .institution-top h1 {
  color: var(--cos-ink);
}

.courseos-app .top-icon {
  border-color: var(--cos-line);
  border-radius: 10px;
  background: var(--cos-surface);
  color: var(--cos-muted);
}

.courseos-app .content,
.courseos-app .institution-content {
  width: min(100%, 1560px);
  max-width: 1560px;
  padding: 30px 34px 56px;
}

.courseos-app .institution-content {
  max-width: 1440px;
}

.courseos-app .headline h1,
.courseos-app .inst-welcome h2,
.courseos-app .inst-page-head h2,
.courseos-app .headline p,
.courseos-app .inst-welcome p,
.courseos-app .inst-page-head p {
  color: var(--cos-ink);
  letter-spacing: 0;
}

.courseos-app .headline p,
.courseos-app .inst-welcome p,
.courseos-app .inst-page-head p {
  color: var(--cos-muted);
}

.courseos-app .eyebrow,
.courseos-app .top-kicker,
.courseos-app .stage-kicker {
  color: var(--cos-primary);
}

.courseos-app button,
.courseos-app input,
.courseos-app select,
.courseos-app textarea {
  font-family: inherit;
}

.courseos-app button {
  cursor: pointer;
}

.courseos-app button:focus-visible,
.courseos-app input:focus-visible,
.courseos-app select:focus-visible,
.courseos-app textarea:focus-visible,
.courseos-app a:focus-visible {
  outline: 3px solid rgba(63, 123, 243, .22);
  outline-offset: 2px;
}

.courseos-app .primary,
.courseos-app .inst-primary,
.courseos-app .courseos-wb-button.primary,
.courseos-app .ai-agent-send {
  border: 1px solid var(--cos-primary);
  border-radius: 10px;
  background: var(--cos-primary);
  color: #fff;
  box-shadow: 0 7px 16px rgba(63, 123, 243, .16);
}

.courseos-app .primary:hover,
.courseos-app .inst-primary:hover,
.courseos-app .courseos-wb-button.primary:hover,
.courseos-app .ai-agent-send:hover {
  background: var(--cos-primary-strong);
  border-color: var(--cos-primary-strong);
  color: #fff;
  transform: translateY(-1px);
}

.courseos-app .ghost,
.courseos-app .inst-ghost,
.courseos-app .courseos-wb-button,
.courseos-app .explorer-back,
.courseos-app .org-modal-close {
  border: 1px solid var(--cos-line-strong);
  border-radius: 10px;
  background: var(--cos-surface);
  color: var(--cos-ink-soft);
  box-shadow: none;
}

.courseos-app .ghost:hover,
.courseos-app .inst-ghost:hover,
.courseos-app .courseos-wb-button:hover,
.courseos-app .explorer-back:hover {
  border-color: #b9cdf5;
  background: var(--cos-primary-soft);
  color: var(--cos-primary);
}

.courseos-app .panel,
.courseos-app .stat,
.courseos-app .course-card,
.courseos-app .inst-panel,
.courseos-app .inst-metrics > div,
.courseos-app .homework-summary > div,
.courseos-app .homework-list,
.courseos-app .prep-board,
.courseos-app .material-card,
.courseos-app .product-large,
.courseos-app .product-overview-bar,
.courseos-app .overview-subject,
.courseos-app .hierarchy-column,
.courseos-app .builder-side,
.courseos-app .builder-main,
.courseos-app .builder-preview,
.courseos-app .training-card,
.courseos-app .institution-explorer-card,
.courseos-app .institution-lesson-card,
.courseos-app .institution-material-card,
.courseos-app .institution-prep-card {
  border: 1px solid var(--cos-line);
  border-radius: var(--cos-radius);
  background: var(--cos-surface);
  box-shadow: var(--cos-shadow-sm);
}

.courseos-app .panel-title,
.courseos-app .inst-panel-head {
  border-color: var(--cos-line);
}

.courseos-app .stat-mark,
.courseos-app .section-icon,
.courseos-app .training-number,
.courseos-app .prep-icon,
.courseos-app .class-icon,
.courseos-app .platform-preview-asset-icon,
.courseos-app .platform-asset-viewer-icon {
  border-radius: 9px;
  background: var(--cos-primary-soft);
  color: var(--cos-primary);
}

.courseos-app .badge,
.courseos-app .institution-online-tag {
  border-radius: 6px;
  background: var(--cos-success-soft);
  color: var(--cos-success);
}

.courseos-app .badge.orange,
.courseos-app .warning,
.courseos-app .institution-material-pending {
  background: var(--cos-accent-soft);
  color: #bd7047;
}

.courseos-app .toolbar .search input,
.courseos-app .search input,
.courseos-app select,
.courseos-app .global-search,
.courseos-app .inst-search,
.courseos-app .institution-global-search {
  border: 1px solid var(--cos-line);
  border-radius: 10px;
  background: var(--cos-surface);
  color: var(--cos-ink);
}

.courseos-app .toolbar .search input:focus,
.courseos-app .search input:focus,
.courseos-app .global-search:focus-within {
  border-color: #9ebaff;
  box-shadow: 0 0 0 4px rgba(63, 123, 243, .1);
}

.courseos-app .level-tab,
.courseos-app .product-tabs button,
.courseos-app .material-filter button,
.courseos-app .builder-tab {
  border-radius: 9px;
}

.courseos-app .level-tab.active,
.courseos-app .product-tabs button.active,
.courseos-app .material-filter button.active,
.courseos-app .builder-tab.active {
  background: var(--cos-primary);
  border-color: var(--cos-primary);
  color: #fff;
}

.courseos-app .cover,
.courseos-app .entity-cover,
.courseos-app .subsubject-cover,
.courseos-app .level-cover,
.courseos-app .institution-explorer-cover,
.courseos-app .institution-lesson-cover,
.courseos-app .institution-unit-cover,
.courseos-app .institution-prep-cover,
.courseos-app .institution-material-cover {
  background-size: cover;
  background-position: center;
}

.courseos-app .course-card:hover,
.courseos-app .overview-subject:hover,
.courseos-app .product-large:hover,
.courseos-app .institution-explorer-card:hover {
  border-color: #b9cdf5;
  box-shadow: var(--cos-shadow);
  transform: translateY(-2px);
}

.courseos-app .product-large {
  color: #fff;
}

.courseos-app .product-large.art,
.courseos-app .product-large.music,
.courseos-app .product-large.code {
  background-position: center;
  background-size: cover;
}

.courseos-app .institution-shell {
  background: var(--cos-canvas);
}

.courseos-app .institution-side {
  padding: 20px 14px 14px;
}

.courseos-app .institution-user {
  border: 1px solid var(--cos-line);
  border-radius: 10px;
  background: var(--cos-surface-soft);
}

.courseos-app .institution-shell.visible {
  grid-template-columns: 244px minmax(0, 1fr);
}

.courseos-app .institution-nav i {
  border-radius: 6px;
  background: var(--cos-accent-soft);
  color: #bd7047;
}

/* Preview and dialog surfaces use the same shell as the main workspaces. */
.courseos-app .preview-modal,
.courseos-app .platform-lesson-preview,
.courseos-app .material-preview-dialog,
.courseos-app .platform-asset-viewer,
.courseos-app .entity-dialog,
.courseos-app .course-import-dialog,
.courseos-app .flow-modal,
.courseos-app .flow-dialog,
.courseos-app .live-admin-dialog,
.courseos-app .sales-demo-dialog,
.courseos-app .standalone-dialog,
.courseos-app .courseos-ai-dialog,
.courseos-app .institution-interaction-dialog,
.courseos-app .interaction-dialog,
.courseos-app .interaction-responses-dialog {
  background: rgba(17, 34, 64, .52);
}

.courseos-app .preview-window,
.courseos-app .platform-lesson-preview-dialog,
.courseos-app .platform-asset-viewer-dialog,
.courseos-app .material-preview-dialog,
.courseos-app .entity-dialog,
.courseos-app .course-import-dialog,
.courseos-app .flow-dialog,
.courseos-app .live-admin-dialog,
.courseos-app .sales-demo-dialog,
.courseos-app .standalone-dialog,
.courseos-app .courseos-ai-dialog,
.courseos-app .institution-interaction-dialog,
.courseos-app .interaction-dialog,
.courseos-app .interaction-responses-dialog {
  border: 1px solid var(--cos-line);
  border-radius: 16px;
  background: var(--cos-surface);
  box-shadow: var(--cos-shadow-lg);
}

/* Workspace navigation stays available while a lesson preview is open. */
.courseos-app .sidebar {
  position: relative;
  z-index: 300;
}

.courseos-app .topbar {
  position: sticky;
  z-index: 301;
}

.courseos-app .platform-lesson-preview {
  z-index: 240;
}

.courseos-app .preview-window-head,
.courseos-app .platform-lesson-preview-head,
.courseos-app .material-preview-head,
.courseos-app .entity-dialog-head,
.courseos-app .org-modal-head,
.courseos-app .interaction-dialog-head,
.courseos-app .release-dialog-head {
  border-color: var(--cos-line);
  background: var(--cos-surface);
}

.courseos-app .platform-lesson-preview-tabs,
.courseos-app .product-tabs,
.courseos-app .builder-tabs {
  border-color: var(--cos-line);
}

.courseos-app .platform-lesson-preview-tab {
  border-bottom: 2px solid transparent;
  color: var(--cos-muted);
}

.courseos-app .platform-lesson-preview-tab:hover,
.courseos-app .platform-lesson-preview-tab.active {
  border-color: var(--cos-primary);
  color: var(--cos-primary);
  background: var(--cos-primary-soft);
}

.courseos-app .platform-lesson-preview-body,
.courseos-app .preview-window-body {
  background: var(--cos-canvas);
}

.courseos-app .preview-stage-nav,
.courseos-app .preview-inspector,
.courseos-app .platform-preview-info,
.courseos-app .platform-preview-materials {
  border-color: var(--cos-line);
  background: var(--cos-surface-soft);
}

.courseos-app .stage-nav-button.active,
.courseos-app .stage-nav-button:hover {
  background: var(--cos-primary-soft);
  color: var(--cos-primary);
}

.courseos-app .platform-preview-content-card,
.courseos-app .platform-preview-resource-card,
.courseos-app .platform-preview-asset,
.courseos-app .stage-lesson-card,
.courseos-app .content-preview-card {
  border-color: var(--cos-line);
  border-radius: 11px;
  background: var(--cos-surface);
  box-shadow: var(--cos-shadow-sm);
}

.courseos-app .platform-preview-video,
.courseos-app .platform-preview-main-image,
.courseos-app .slide-preview,
.courseos-app .slide-stage {
  border-color: var(--cos-line);
  border-radius: 11px;
  background: var(--cos-surface);
}

/* Training, AI and live classroom stay inside the same product shell. */
.courseos-app .training-hero,
.courseos-app .courseos-wb-topbar,
.courseos-app .courseos-wb-stage-head,
.courseos-app .courseos-wb-transport,
.courseos-app .courseos-wb-right,
.courseos-app .courseos-wb-overlay-card {
  border-color: var(--cos-line);
  background: var(--cos-surface);
  color: var(--cos-ink);
}

.courseos-app .training-hero {
  border: 1px solid var(--cos-line);
  border-radius: var(--cos-radius);
  box-shadow: var(--cos-shadow-sm);
}

.courseos-app .training-hero h3,
.courseos-app .training-hero p,
.courseos-app .training-hero > div:first-child > span {
  color: var(--cos-ink);
}

.courseos-app .training-card.current {
  border-color: #a9c4f8;
  box-shadow: 0 0 0 3px var(--cos-primary-soft);
}

.courseos-app .courseos-workbench,
.courseos-app .courseos-wb-layout,
.courseos-app .courseos-wb-main,
.courseos-app .courseos-wb-center {
  background: var(--cos-canvas) !important;
  color: var(--cos-ink) !important;
}

.courseos-app .courseos-wb-rail {
  border-color: var(--cos-line) !important;
  background: var(--cos-surface-soft) !important;
}

.courseos-app .courseos-wb-brand,
.courseos-app .courseos-wb-context strong,
.courseos-app .courseos-wb-stage-head h2,
.courseos-app .courseos-wb-panel h3,
.courseos-app .courseos-wb-overlay-card header h3 {
  color: var(--cos-ink) !important;
}

.courseos-app .courseos-wb-mark {
  border-radius: 10px !important;
  background: var(--cos-primary) !important;
  color: #fff !important;
  transform: none !important;
}

.courseos-app .courseos-wb-live,
.courseos-app .courseos-wb-resource.active {
  border-color: #bcd3ff !important;
  background: var(--cos-primary-soft) !important;
  color: var(--cos-primary) !important;
}

.courseos-app .courseos-wb-canvas,
.courseos-app .courseos-wb-transport,
.courseos-app .courseos-wb-resource,
.courseos-app .courseos-wb-tool {
  border-color: var(--cos-line) !important;
  border-radius: 11px !important;
  background: var(--cos-surface) !important;
  box-shadow: var(--cos-shadow-sm) !important;
  color: var(--cos-ink-soft) !important;
}

.courseos-app .courseos-wb-resource-icon,
.courseos-app .courseos-wb-tool-icon {
  border-radius: 9px !important;
  background: var(--cos-primary-soft) !important;
  color: var(--cos-primary) !important;
}

.courseos-app .classroom-screen {
  background: var(--cos-canvas) !important;
  color: var(--cos-ink) !important;
}

.courseos-app .classroom-tools {
  border: 1px solid var(--cos-line);
  border-radius: 12px;
  background: var(--cos-surface);
  box-shadow: var(--cos-shadow-sm);
}

.courseos-app .classroom-tools button {
  border-radius: 9px;
  color: var(--cos-ink-soft);
}

.courseos-app .classroom-tools button:hover,
.courseos-app .classroom-tools .tool-active {
  background: var(--cos-primary-soft);
  color: var(--cos-primary);
}

.courseos-app .ai-agent-layout,
.courseos-app .agent-workbench {
  border-color: var(--cos-line);
  border-radius: 14px;
  background: var(--cos-surface);
  box-shadow: var(--cos-shadow-sm);
}

.courseos-app .ai-agent-conversation,
.courseos-app .agent-main {
  background: var(--cos-surface);
}

.courseos-app .ai-agent-conversation .ai-message-list,
.courseos-app .ai-agent-side,
.courseos-app .agent-rail,
.courseos-app .agent-context {
  background: var(--cos-surface-soft);
}

.courseos-app .ai-agent-side {
  border-color: var(--cos-line);
}

.courseos-app .ai-agent-welcome,
.courseos-app .agent-session.active,
.courseos-app .agent-product-materials {
  border-color: #c9d9fb;
  background: var(--cos-primary-soft);
}

.courseos-app .ai-agent-suggestions button,
.courseos-app .ai-agent-icon-button {
  border-color: var(--cos-line-strong);
  border-radius: 9px;
  background: var(--cos-surface);
  color: var(--cos-primary);
}

.courseos-app .ai-agent-conversation .ai-message-bubble {
  border-color: var(--cos-line);
  border-radius: 12px;
  background: var(--cos-surface);
  color: var(--cos-ink-soft);
}

.courseos-app .ai-agent-conversation .ai-message-request .ai-message-bubble {
  border-color: #c9d9fb;
  background: var(--cos-primary-soft);
  color: #274c9a;
}

.courseos-app .ai-agent-tool-panel,
.courseos-app .ai-agent-side-section {
  border-color: var(--cos-line);
}

@media (max-width: 980px) {
  .courseos-app .app,
  .courseos-app .institution-shell.visible {
    grid-template-columns: 216px minmax(0, 1fr);
  }

  .courseos-app .content,
  .courseos-app .institution-content {
    padding-right: 24px;
    padding-left: 24px;
  }
}

@media (max-width: 720px) {
  .courseos-app .app,
  .courseos-app .institution-shell.visible {
    grid-template-columns: 1fr;
  }

  .courseos-app .sidebar,
  .courseos-app .institution-side {
    display: none;
  }

  .courseos-app .topbar,
  .courseos-app .institution-top {
    padding: 0 16px;
  }

  .courseos-app .content,
  .courseos-app .institution-content {
    padding: 22px 16px 40px;
  }

  .courseos-app .headline,
  .courseos-app .inst-welcome,
  .courseos-app .inst-page-head {
    display: block;
  }

  .courseos-app .headline > *,
  .courseos-app .inst-welcome > *,
  .courseos-app .inst-page-head > * {
    margin-top: 14px;
  }

  .courseos-app .headline h1,
  .courseos-app .inst-welcome h2,
  .courseos-app .inst-page-head h2 {
    font-size: 24px;
  }

  .courseos-app .topbar .global-search {
    display: none;
  }
}

/* Course materials use one content model across headquarters and institution views. */
.courseos-app .courseos-material-pagination { display:flex; align-items:center; justify-content:space-between; gap:16px; padding-top:20px; margin-top:20px; border-top:1px solid #dce5f3; color:#7c8ca8; font-size:12px; flex-wrap:wrap; }
.courseos-app .courseos-material-pagination div { display:flex; gap:8px; flex-wrap:wrap; }
.courseos-app .courseos-material-pagination .active { background:#eaf0ff; color:#3975f6; border-color:#9cbaff; }
.courseos-app .courseos-material-pagination button:disabled { opacity:.45; cursor:default; }
.courseos-app .courseos-materials-head {
  margin-bottom: 22px;
}

.courseos-app .courseos-materials-summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.courseos-app .courseos-materials-kpi {
  min-width: 0;
  padding: 16px 18px;
  border: 1px solid var(--cos-line);
  border-radius: var(--cos-radius);
  background: var(--cos-surface);
  box-shadow: var(--cos-shadow-sm);
}

.courseos-app .courseos-materials-kpi span,
.courseos-app .courseos-materials-kpi small {
  display: block;
  color: var(--cos-muted);
  font-size:13px;
}

.courseos-app .courseos-materials-kpi b {
  display: block;
  margin: 8px 0 4px;
  color: var(--cos-ink);
  font-size: 25px;
  line-height: 1;
}

.courseos-app .courseos-materials-workspace {
  padding: 18px;
  border: 1px solid var(--cos-line);
  border-radius: var(--cos-radius);
  background: var(--cos-surface);
  box-shadow: var(--cos-shadow-sm);
}

.courseos-app .courseos-materials-toolbar {
  display: flex;
  align-items: center;
  gap: 9px;
  flex-wrap: wrap;
}

.courseos-app .courseos-material-search {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1 1 300px;
  min-width: 220px;
  height: 40px;
  padding: 0 12px;
  border: 1px solid var(--cos-line);
  border-radius: 10px;
  background: var(--cos-surface);
  color: var(--cos-muted);
}

.courseos-app .courseos-material-search:focus-within {
  border-color: #9ebaff;
  box-shadow: 0 0 0 4px rgba(63, 123, 243, .1);
}

.courseos-app .courseos-material-search input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--cos-ink);
  font-size: 11px;
}

.courseos-app .courseos-materials-toolbar select {
  min-width: 190px;
  height: 40px;
}

.courseos-app .courseos-materials-filter-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 16px 0 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--cos-line);
}

.courseos-app .courseos-materials-filter-label {
  flex: none;
  color: var(--cos-muted);
  font-size: 10px;
  font-weight: 700;
}

.courseos-app .courseos-materials-filters,
.courseos-app .institution-material-filters {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.courseos-app .courseos-materials-filters button,
.courseos-app .institution-material-filters button {
  min-height: 30px;
  padding: 6px 10px;
  border: 1px solid var(--cos-line);
  border-radius: 8px;
  background: var(--cos-surface);
  color: var(--cos-muted);
  font-size: 10px;
  cursor: pointer;
}

.courseos-app .courseos-materials-filters button:hover,
.courseos-app .courseos-materials-filters button.active,
.courseos-app .institution-material-filters button:hover,
.courseos-app .institution-material-filters button.active {
  border-color: #b9cdf7;
  background: var(--cos-primary-soft);
  color: var(--cos-primary);
}

.courseos-app .courseos-materials-summary-text {
  margin-left: auto;
  flex: none;
  color: var(--cos-muted);
  font-size: 10px;
}

.courseos-app .courseos-materials-grid,
.courseos-app .institution-material-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.courseos-app .courseos-material-card,
.courseos-app .institution-material-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--cos-line);
  border-radius: var(--cos-radius);
  background: var(--cos-surface);
  box-shadow: var(--cos-shadow-sm);
  transition: border-color .16s ease, box-shadow .16s ease, transform .16s ease;
}

.courseos-app .courseos-material-card:hover,
.courseos-app .institution-material-card:hover {
  border-color: #b9cdf7;
  box-shadow: var(--cos-shadow);
  transform: translateY(-2px);
}

.courseos-app .courseos-material-card-cover,
.courseos-app .institution-material-card-cover {
  position: relative;
  min-height: 164px;
  padding: 15px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  overflow: hidden;
  color: #fff;
}

.courseos-app .courseos-material-card-cover:after,
.courseos-app .institution-material-card-cover:after {
  content: "";
  position: absolute;
  width: 150px;
  height: 150px;
  right: -50px;
  bottom: -62px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .18);
}

.courseos-app .courseos-material-card-cover.cover-coral,
.courseos-app .institution-material-card-cover.cover-coral {
  background: linear-gradient(135deg, #ed9375, #b65d67);
}

.courseos-app .courseos-material-card-cover.cover-indigo,
.courseos-app .institution-material-card-cover.cover-indigo {
  background: linear-gradient(135deg, #668ef2, #4051a6);
}

.courseos-app .courseos-material-card-cover.cover-mint,
.courseos-app .institution-material-card-cover.cover-mint {
  background: linear-gradient(135deg, #53b9a8, #257c91);
}

.courseos-app .courseos-material-card-cover.cover-purple,
.courseos-app .institution-material-card-cover.cover-purple {
  background: linear-gradient(135deg, #9c83e7, #6259ae);
}

.courseos-app .courseos-material-check,
.courseos-app .institution-material-card-cover > input {
  position: relative;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: rgba(255, 255, 255, .2);
}

.courseos-app .courseos-material-check input {
  width: 14px;
  height: 14px;
  accent-color: #fff;
}

.courseos-app .courseos-material-cover-content,
.courseos-app .institution-material-card-cover > div {
  position: relative;
  z-index: 1;
  align-self: flex-end;
  min-width: 0;
  max-width: 78%;
}

.courseos-app .courseos-material-type,
.courseos-app .courseos-material-cover-content small,
.courseos-app .institution-material-card-cover small {
  display: block;
  color: rgba(255, 255, 255, .78);
  font-size: 9px;
}
.courseos-app .courseos-material-cover-content small,.courseos-app .institution-material-card-cover small{font-size:13px}

.courseos-app .courseos-material-cover-content strong,
.courseos-app .institution-material-card-cover b {
  display: block;
  margin: 6px 0 4px;
  color: #fff;
  font-size: 16px;
  line-height: 1.35;
}

.courseos-app .courseos-material-status,
.courseos-app .institution-material-card-cover em {
  position: relative;
  z-index: 1;
  flex: none;
  font-style: normal;
  font-size: 9px;
}

.courseos-app .courseos-material-status .courseos-live-pill {
  background: rgba(255, 255, 255, .18);
  color: #fff;
}

.courseos-app .courseos-material-card-body,
.courseos-app .institution-material-card-body {
  padding: 15px;
}

.courseos-app .courseos-material-path,
.courseos-app .institution-material-card-body > strong {
  display: block;
  overflow: hidden;
  color: var(--cos-primary);
  font-size: 10px;
  font-weight: 700;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.courseos-app .courseos-material-card-body p,
.courseos-app .institution-material-card-body p {
  min-height: 32px;
  margin: 8px 0 12px;
  color: var(--cos-muted);
  font-size:13px;
  line-height: 1.6;
}

.courseos-app .courseos-material-file {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
  padding: 10px;
  border: 1px solid var(--cos-line);
  border-radius: 9px;
  background: var(--cos-surface-soft);
}

.courseos-app .courseos-material-file-icon {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  flex: none;
  border-radius: 8px;
  background: var(--cos-primary-soft);
  color: var(--cos-primary);
  font-size: 8px;
  font-weight: 800;
}

.courseos-app .courseos-material-file div {
  min-width: 0;
}

.courseos-app .courseos-material-file b,
.courseos-app .courseos-material-file small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.courseos-app .courseos-material-file b {
  color: var(--cos-ink-soft);
  font-size: 10px;
}

.courseos-app .courseos-material-file small {
  margin-top: 4px;
  color: var(--cos-muted);
  font-size:13px;
}

.courseos-app .courseos-material-card-actions,
.courseos-app .institution-material-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 13px;
}

.courseos-app .courseos-material-card-actions button,
.courseos-app .institution-material-actions button {
  min-height: 30px;
  padding: 6px 9px;
  font-size: 9px;
}

.courseos-app .courseos-material-card-actions .courseos-material-more {
  margin-left: auto;
  border: 0;
  background: transparent;
  color: var(--cos-muted);
}

.courseos-app .courseos-material-pending,
.courseos-app .institution-material-pending,
.courseos-app .institution-material-online {
  color: #bd7047;
  font-size: 9px;
}

.courseos-app .courseos-material-empty,
.courseos-app .institution-material-empty {
  grid-column: 1 / -1;
  padding: 52px 20px;
  border: 1px dashed var(--cos-line-strong);
  border-radius: var(--cos-radius);
  text-align: center;
}

.courseos-app .courseos-material-empty-icon {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  margin: 0 auto 10px;
  border-radius: 12px;
  background: var(--cos-primary-soft);
  color: var(--cos-primary);
  font-size: 19px;
}

.courseos-app .courseos-material-empty b,
.courseos-app .courseos-material-empty span,
.courseos-app .institution-material-empty b,
.courseos-app .institution-material-empty span {
  display: block;
}

.courseos-app .courseos-material-empty b,
.courseos-app .institution-material-empty b {
  color: var(--cos-ink-soft);
  font-size: 12px;
}

.courseos-app .courseos-material-empty span,
.courseos-app .institution-material-empty span {
  margin-top: 7px;
  color: var(--cos-muted);
  font-size: 10px;
}

.courseos-app .institution-material-toolbar {
  display: flex;
  align-items: center;
  gap: 9px;
  flex-wrap: wrap;
  margin: 15px 0 10px;
}

.courseos-app .institution-material-toolbar .courseos-material-search {
  flex: 1 1 240px;
}

.courseos-app .institution-material-filters {
  margin-bottom: 15px;
}

/* Business operations is a working console, not a placeholder dashboard. */
.courseos-app .business-page-head {
  margin-bottom: 20px;
}

.courseos-app .business-kpis {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.courseos-app .business-kpis > div,
.courseos-app .business-panel {
  min-width: 0;
  border: 1px solid var(--cos-line);
  border-radius: var(--cos-radius);
  background: var(--cos-surface);
  box-shadow: var(--cos-shadow-sm);
}

.courseos-app .business-kpis > div {
  padding: 16px 17px;
}

.courseos-app .business-kpis span,
.courseos-app .business-kpis small {
  display: block;
  color: var(--cos-muted);
  font-size:13px;
}

.courseos-app .business-kpis b {
  display: block;
  margin: 10px 0 5px;
  color: var(--cos-ink);
  font-size: 25px;
  line-height: 1;
}

.courseos-app .business-main-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  gap: 14px;
  margin-bottom: 14px;
}

.courseos-app .business-panel {
  padding: 18px;
}

.courseos-app .business-panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 13px;
}

.courseos-app .business-panel-head h3 {
  margin: 0;
  color: var(--cos-ink);
  font-size: 14px;
}

.courseos-app .business-panel-head p {
  margin: 5px 0 0;
  color: var(--cos-muted);
  font-size:13px;
}

.courseos-app .business-panel-meta {
  flex: none;
  color: var(--cos-primary);
  font-size:13px;
  font-weight: 700;
}

.courseos-app .business-followup-list,
.courseos-app .business-usage-list {
  display: grid;
  gap: 2px;
}

.courseos-app .business-followup-row,
.courseos-app .business-usage-row {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  padding: 11px 0;
  border-top: 1px solid #edf1f6;
}

.courseos-app .business-followup-row > div,
.courseos-app .business-usage-row > div:nth-child(2) {
  flex: 1;
  min-width: 0;
}

.courseos-app .business-followup-row b,
.courseos-app .business-followup-row small,
.courseos-app .business-usage-row b,
.courseos-app .business-usage-row small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.courseos-app .business-followup-row b,
.courseos-app .business-usage-row b {
  color: var(--cos-ink-soft);
  font-size: 11px;
}

.courseos-app .business-followup-row small,
.courseos-app .business-usage-row small {
  margin-top: 4px;
  color: var(--cos-muted);
  font-size:13px;
}

.courseos-app .business-followup-icon,
.courseos-app .business-usage-avatar {
  display: grid;
  place-items: center;
  flex: none;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: var(--cos-primary-soft);
  color: var(--cos-primary);
  font-size: 11px;
  font-weight: 800;
}

.courseos-app .business-followup-icon.overdue {
  background: var(--cos-accent-soft);
  color: #b96b3c;
}

.courseos-app .business-usage-avatar {
  background: #eef7f4;
  color: #2b9476;
}

.courseos-app .business-usage-row > span {
  flex: none;
  color: var(--cos-muted);
  font-size: 12px;
}

.courseos-app .business-usage-row b {
  font-size: 14px;
}

.courseos-app .business-usage-row small {
  font-size: 14px;
}

.courseos-app .business-usage-avatar {
  font-size: 13px;
}

.courseos-app .business-usage-pagination {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
  padding-top: 14px;
  margin-top: 8px;
  border-top: 1px solid #edf1f6;
  color: var(--cos-muted);
  font-size: 12px;
}

.courseos-app .business-usage-pagination[hidden] {
  display: none;
}

.courseos-app .business-usage-summary {
  flex-basis: 100%;
}

.courseos-app .business-usage-page-buttons,
.courseos-app .business-usage-jump,
.courseos-app .business-usage-jump label {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.courseos-app .business-usage-pagination .ghost,
.courseos-app .business-usage-load-status .ghost {
  min-height: 30px;
  padding: 5px 9px;
  font-size: 12px;
}

.courseos-app .business-usage-pagination .ghost.active {
  border-color: var(--cos-primary);
  background: var(--cos-primary-soft);
  color: var(--cos-primary);
}

.courseos-app .business-usage-pagination .ghost:disabled {
  cursor: default;
  opacity: .45;
}

.courseos-app .business-usage-jump input {
  width: 56px;
  min-height: 30px;
  padding: 4px 6px;
  border: 1px solid #dce5ee;
  border-radius: 6px;
  background: #fff;
  color: var(--cos-ink);
  font: inherit;
}

.courseos-app .business-usage-load-status {
  color: var(--cos-muted);
  font-size: 12px;
}

.courseos-app .business-usage-load-status:not(:empty) {
  margin-top: 10px;
}

.courseos-app .business-usage-skeleton {
  min-height: 64px;
}

.courseos-app .business-usage-skeleton b,
.courseos-app .business-usage-skeleton small {
  width: 45%;
  height: 12px;
  border-radius: 4px;
  background: #edf1f6;
}

.courseos-app .business-usage-skeleton small {
  width: 65%;
  margin-top: 8px;
}

.courseos-app .business-followup-row button {
  flex: none;
  padding: 6px 8px;
  font-size: 9px;
}

.courseos-app .business-followup-row b {
  font-size: 15px;
  line-height: 1.5;
}

.courseos-app .business-followup-row small {
  font-size: 14px;
  line-height: 1.6;
}

.courseos-app .business-followup-icon {
  font-size: 13px;
}

.courseos-app .business-finance-panel {
  overflow: hidden;
}

.courseos-app .business-finance-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin: 4px 0 14px;
  padding: 12px;
  border: 1px solid var(--cos-line);
  border-radius: 10px;
  background: var(--cos-surface-soft);
}

.courseos-app .business-search {
  display: flex;
  align-items: center;
  gap: 7px;
  flex: 1 1 260px;
  min-width: 210px;
  height: 36px;
  padding: 0 10px;
  border: 1px solid var(--cos-line);
  border-radius: 8px;
  background: var(--cos-surface);
  color: var(--cos-muted);
}

.courseos-app .business-search:focus-within {
  border-color: #9ebaff;
  box-shadow: 0 0 0 3px rgba(63, 123, 243, .1);
}

.courseos-app .business-search input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--cos-ink);
  font-size: 10px;
}

.courseos-app .business-finance-toolbar select {
  min-width: 125px;
  height: 36px;
  font-size: 10px;
}

.courseos-app .business-row-actions {
  gap: 5px;
  flex-wrap: wrap;
}

.courseos-app .business-row-actions button {
  padding: 6px 7px;
  font-size: 9px;
  white-space: nowrap;
}

.courseos-app .business-finance-table td small {
  display: block;
  margin-top: 4px;
  color: var(--cos-muted);
  font-size:14px;
}

.courseos-app .business-finance-table th {
  font-size: 12px;
}

.courseos-app .business-finance-table td {
  font-size: 13px;
  line-height: 1.6;
}

.courseos-app .business-finance-table td b {
  font-size: 14px;
}

.courseos-app .business-finance-table .business-status,
.courseos-app .business-finance-table .business-row-actions button {
  font-size: 12px;
}

.courseos-app .business-status {
  display: inline-flex;
  align-items: center;
  min-height: 22px;
  padding: 3px 7px;
  border-radius: 6px;
  font-size: 9px;
  white-space: nowrap;
}

.courseos-app .business-status-paid {
  background: var(--cos-success-soft);
  color: #218963;
}

.courseos-app .business-finance-table .business-status-pending {
  background: #fff3bf;
  color: #855b00;
}

.courseos-app .business-finance-table .business-status-overdue {
  background: #f8e4e7;
  color: #8b2635;
}

.courseos-app .business-status-cancelled {
  background: #f0f2f5;
  color: var(--cos-muted);
}

.courseos-app .business-empty {
  padding: 26px 12px;
  color: var(--cos-muted);
  font-size: 10px;
  text-align: center;
}

@media (max-width: 1100px) {
  .courseos-app .business-kpis {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 820px) {
  .courseos-app .business-main-grid {
    grid-template-columns: 1fr;
  }

  .courseos-app .business-kpis {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .courseos-app .business-kpis {
    grid-template-columns: 1fr;
  }

  .courseos-app .business-panel {
    padding: 14px;
  }

  .courseos-app .business-finance-toolbar select {
    width: 100%;
  }
}

.courseos-app .material-preview-body video {
  width: 100%;
  height: 100%;
  background: #101827;
  object-fit: contain;
}

.courseos-app .material-preview-audio {
  width: min(460px, 86%);
  padding: 32px;
  border: 1px solid var(--cos-line);
  border-radius: 14px;
  background: var(--cos-surface);
  text-align: center;
  box-shadow: var(--cos-shadow);
}

.courseos-app .material-preview-audio-icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  margin: 0 auto 14px;
  border-radius: 16px;
  background: var(--cos-primary-soft);
  color: var(--cos-primary);
  font-size: 26px;
}

.courseos-app .material-preview-audio b {
  display: block;
  color: var(--cos-ink);
  font-size: 12px;
}

.courseos-app .material-preview-audio audio {
  width: 100%;
  margin-top: 20px;
}

@media (max-width: 1050px) {
  .courseos-app .courseos-materials-grid,
  .courseos-app .institution-material-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .courseos-app .courseos-materials-summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .courseos-app .courseos-materials-workspace {
    padding: 13px;
  }

  .courseos-app .courseos-materials-filter-row {
    display: block;
  }

  .courseos-app .courseos-materials-filter-label {
    margin-bottom: 8px;
  }

  .courseos-app .courseos-materials-summary-text {
    display: block;
    margin: 10px 0 0;
  }

  .courseos-app .courseos-materials-grid,
  .courseos-app .institution-material-grid {
    grid-template-columns: 1fr;
  }
}

/* Shared interaction states for both workspaces and their lesson surfaces. */
.courseos-app .platform-asset-viewer {
  z-index: 450 !important;
}

.courseos-app :is(button, [role="button"]):disabled,
.courseos-app button[aria-disabled="true"],
.courseos-workbench button:disabled {
  cursor: not-allowed;
  opacity: .48;
  transform: none;
  box-shadow: none;
}

.courseos-app :is(button, [role="button"]):not(:disabled):active,
.courseos-workbench button:not(:disabled):active {
  transform: translateY(1px);
  box-shadow: none;
}

.courseos-app :is(input, select, textarea):not(:disabled):focus-visible,
.courseos-app :is(.inst-search, .global-search, .institution-global-search):focus-within {
  border-color: #8aaef7;
  box-shadow: 0 0 0 3px rgba(63, 123, 243, .13);
}

.courseos-app :is(button, a, input, select, textarea):focus-visible,
.courseos-workbench :is(button, a, input, select, textarea):focus-visible {
  outline: 2px solid #2f63d6;
  outline-offset: 2px;
}

.courseos-app .platform-lesson-preview-body,
.courseos-app .platform-ppt-page-list,
.courseos-app .platform-asset-viewer-screen {
  overscroll-behavior: contain;
}

.courseos-app .platform-lesson-preview-body {
  scrollbar-gutter: stable;
}

.courseos-app .platform-lesson-preview-tab {
  transition: color .16s ease, background-color .16s ease, border-color .16s ease;
}

.courseos-app .platform-ppt-page-thumb,
.courseos-app .platform-preview-resource-card,
.courseos-app .institution-explorer-card {
  transition: border-color .16s ease, box-shadow .16s ease, background-color .16s ease;
}

@media (hover: hover) {
  .courseos-app .platform-ppt-page-thumb:not(:disabled):hover,
  .courseos-app .platform-preview-resource-card:not(:disabled):hover,
  .courseos-app .institution-explorer-card:hover {
    border-color: #9bbcf8;
    box-shadow: 0 6px 18px rgba(30, 52, 88, .1);
  }
}

/* Global search keeps its resting border when the input receives focus. */
.courseos-app .global-search > span[aria-hidden="true"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 20px;
  width: 20px;
  height: 20px;
  font-size: 22px;
  line-height: 1;
  color: var(--cos-muted);
}

.courseos-app .global-search:focus-within {
  border-color: var(--cos-line);
  outline: none;
  box-shadow: none;
}

.courseos-app .global-search input:focus,
.courseos-app .global-search input:focus-visible {
  border: 0;
  outline: none;
  box-shadow: none;
}

/* Shared search treatment across platform and institution workspaces. */
.courseos-app .courseos-search-icon,
.courseos-app .search > span:first-child,
.courseos-app .org-search-wrap > span[aria-hidden="true"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 20px;
  width: 20px;
  height: 20px;
  font-size: 22px;
  line-height: 1;
  vertical-align: middle;
}

.courseos-app .search > span:first-child {
  top: 50%;
  transform: translateY(-50%);
}

.courseos-app .mobile-platform-search {
  font-size: 22px;
  line-height: 1;
}

.courseos-app :is(.global-search, .inst-search, .search, .overview-search,
  .institution-prep-search, .wall-search, .org-search-wrap,
  .courseos-material-search, .business-search, .course-system-search,
  .harness-session-search):focus-within {
  border-color: var(--cos-line) !important;
  outline: none !important;
  box-shadow: none !important;
}

.courseos-app input:is([type="search"], [placeholder*="搜索"]):focus,
.courseos-app input:is([type="search"], [placeholder*="搜索"]):focus-visible {
  border-color: var(--cos-line) !important;
  outline: none !important;
  box-shadow: none !important;
}

@media (prefers-reduced-motion: reduce) {
  .courseos-app .platform-lesson-preview-tab,
  .courseos-app .platform-ppt-page-thumb,
  .courseos-app .platform-preview-resource-card,
  .courseos-app .institution-explorer-card {
    transition: none;
  }
}

/* Task-first Agent workbench: execution is the primary surface, chat is a log. */
.courseos-app .ai-agent-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr) 292px;
  min-height: 720px;
  overflow: hidden;
  border: 1px solid var(--cos-line);
  border-radius: 14px;
  background: var(--cos-surface);
  box-shadow: var(--cos-shadow-sm);
}
.courseos-app .ai-agent-queue,
.courseos-app .ai-agent-context-panel {
  min-width: 0;
  background: var(--cos-surface-soft);
}
.courseos-app .ai-agent-queue { padding: 17px 14px; border-right: 1px solid var(--cos-line); }
.courseos-app .ai-agent-context-panel { padding: 14px; border-left: 1px solid var(--cos-line); overflow: auto; }
.courseos-app .ai-agent-queue-head,
.courseos-app .ai-context-card-head,
.courseos-app .ai-agent-command-head,
.courseos-app .ai-agent-launch-head,
.courseos-app .ai-agent-execution-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.courseos-app .ai-agent-queue-head h3,
.courseos-app .ai-context-card h3,
.courseos-app .ai-agent-launch-head h3,
.courseos-app .ai-agent-execution-head h3 { margin: 4px 0 0; color: var(--cos-ink); font-size: 15px; }
.courseos-app .ai-section-kicker { color: var(--cos-primary); font: 700 9px/1.2 "DM Mono", monospace; letter-spacing: .12em; }
.courseos-app .ai-agent-queue .ai-session-list { display: grid; gap: 5px; margin-top: 16px; max-height: 470px; overflow: auto; }
.courseos-app .ai-agent-queue .ai-session-item { width: 100%; padding: 10px 9px; border: 1px solid transparent; border-radius: 9px; background: transparent; color: var(--cos-ink-soft); text-align: left; }
.courseos-app .ai-agent-queue .ai-session-item:hover { background: var(--cos-primary-soft); }
.courseos-app .ai-agent-queue .ai-session-item.active { border-color: #c9d9fb; background: var(--cos-primary-soft); color: #274c9a; }
.courseos-app .ai-agent-queue .ai-session-item b,
.courseos-app .ai-agent-queue .ai-session-item span { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.courseos-app .ai-agent-queue .ai-session-item b { font-size: 10px; }
.courseos-app .ai-agent-queue .ai-session-item span { margin-top: 4px; color: var(--cos-muted); font-size: 8px; }
.courseos-app .ai-agent-session-actions { display: flex; gap: 6px; margin-top: 12px; }
.courseos-app .ai-agent-session-actions button { flex: 1; padding: 7px 6px; border: 1px solid var(--cos-line); border-radius: 7px; background: var(--cos-surface); color: var(--cos-ink-soft); font-size: 9px; }
.courseos-app .ai-agent-queue-note { margin-top: 24px; padding: 11px; border: 1px solid var(--cos-line); border-radius: 9px; background: var(--cos-surface); }
.courseos-app .ai-agent-queue-note b,
.courseos-app .ai-agent-queue-note span { display: block; }
.courseos-app .ai-agent-queue-note b { color: var(--cos-ink); font-size: 10px; }
.courseos-app .ai-agent-queue-note span { margin-top: 5px; color: var(--cos-muted); font-size:13px; line-height: 1.6; }
.courseos-app .ai-agent-command-center { min-width: 0; background: var(--cos-surface); }
.courseos-app .ai-agent-command-head { padding: 20px 22px 16px; border-bottom: 1px solid var(--cos-line); }
.courseos-app .ai-agent-command-head h2 { margin: 5px 0 0; color: var(--cos-ink); font-size: 20px; }
.courseos-app .ai-agent-command-head p,
.courseos-app .ai-agent-launch-head p,
.courseos-app .ai-agent-execution-head p { margin: 5px 0 0; color: var(--cos-muted); font-size:13px; line-height: 1.6; }
.courseos-app .ai-agent-command-actions { display: flex; align-items: center; gap: 8px; flex: none; }
.courseos-app .ai-agent-connection { display: inline-flex; align-items: center; gap: 6px; padding: 7px 9px; border: 1px solid #cae1d5; border-radius: 7px; background: #f0f9f3; color: #167046; font-size: 9px; white-space: nowrap; }
.courseos-app .ai-agent-connection::before { width: 6px; height: 6px; border-radius: 50%; background: #28a866; content: ""; }
.courseos-app .ai-agent-launch-card,
.courseos-app .ai-agent-execution-card { margin: 16px 20px 0; border: 1px solid var(--cos-line); border-radius: 12px; background: var(--cos-surface); }
.courseos-app .ai-agent-launch-card { padding: 17px; background: #fbfdff; }
.courseos-app .ai-agent-launch-head { margin-bottom: 15px; }
.courseos-app .ai-agent-run-mode { padding: 6px 8px; border: 1px solid #c9d9fb; border-radius: 6px; color: #31569e; background: var(--cos-primary-soft); font-size: 9px; white-space: nowrap; }
.courseos-app .ai-agent-launch-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(260px, 1.1fr); gap: 16px; }
.courseos-app .ai-agent-task-picker { padding: 13px; border: 1px solid var(--cos-line); border-radius: 9px; background: var(--cos-surface); }
.courseos-app .ai-agent-task-picker label,
.courseos-app .ai-agent-run-form label { display: grid; gap: 6px; color: var(--cos-ink-soft); font-size: 10px; }
.courseos-app .ai-agent-task-picker select,
.courseos-app .ai-agent-run-form input,
.courseos-app .ai-agent-run-form select,
.courseos-app .ai-agent-run-form textarea { width: 100%; border: 1px solid var(--cos-line); border-radius: 7px; padding: 9px 10px; color: var(--cos-ink); background: var(--cos-surface); font: inherit; font-size: 10px; outline: none; }
.courseos-app .ai-agent-run-form textarea { min-height: 62px; resize: vertical; }
.courseos-app .ai-agent-task-picker select:focus,
.courseos-app .ai-agent-run-form input:focus,
.courseos-app .ai-agent-run-form select:focus,
.courseos-app .ai-agent-run-form textarea:focus { border-color: #87a9ed; box-shadow: 0 0 0 3px #e5edff; }
.courseos-app .ai-agent-task-picker p { margin: 7px 0 14px; color: var(--cos-muted); font-size:13px; line-height: 1.6; }
.courseos-app .ai-agent-task-label { margin: 12px 0 8px; color: var(--cos-ink); font-size: 10px; font-weight: 700; }
.courseos-app .ai-ops-roles { display: flex; flex-wrap: wrap; gap: 5px; }
.courseos-app .ai-ops-roles button,
.courseos-app .ai-ops-tasks button { border: 1px solid var(--cos-line); border-radius: 7px; background: var(--cos-surface); color: var(--cos-ink-soft); }
.courseos-app .ai-ops-roles button { padding: 6px 8px; font-size: 9px; }
.courseos-app .ai-ops-roles button.active,
.courseos-app .ai-ops-roles button:hover { border-color: #a8c1f4; background: var(--cos-primary-soft); color: #31569e; }
.courseos-app .ai-ops-tasks { display: grid; gap: 5px; margin-top: 8px; }
.courseos-app .ai-ops-tasks button { display: grid; gap: 3px; padding: 8px; text-align: left; }
.courseos-app .ai-ops-tasks button b { font-size: 10px; }
.courseos-app .ai-ops-tasks button span { color: var(--cos-muted); font-size: 8px; }
.courseos-app .ai-ops-tasks button.active,
.courseos-app .ai-ops-tasks button:hover { border-color: #a8c1f4; background: var(--cos-primary-soft); }
.courseos-app .ai-agent-run-form { display: grid; gap: 9px; padding: 13px; border: 1px solid var(--cos-line); border-radius: 9px; background: var(--cos-surface); }
.courseos-app .ai-agent-selected-task { padding: 10px; border-left: 3px solid var(--cos-primary); background: var(--cos-primary-soft); }
.courseos-app .ai-agent-selected-task span,
.courseos-app .ai-agent-selected-task b,
.courseos-app .ai-agent-selected-task small { display: block; }
.courseos-app .ai-agent-selected-task span { color: var(--cos-primary); font-size: 8px; }
.courseos-app .ai-agent-selected-task b { margin-top: 3px; color: var(--cos-ink); font-size: 12px; }
.courseos-app .ai-agent-selected-task small { margin-top: 3px; color: var(--cos-muted); font-size:13px; }
.courseos-app .ai-agent-start-button { display: flex; align-items: center; justify-content: center; gap: 6px; min-height: 39px; margin-top: 2px; border-radius: 8px; font-size: 10px; }
.courseos-app .ai-agent-start-button span { font-size: 9px; }
.courseos-app .ai-agent-execution-card { padding: 17px; }
.courseos-app .ai-agent-execution-head { align-items: center; }
.courseos-app .ai-run-status { padding: 6px 9px; border-radius: 7px; font-size: 9px; white-space: nowrap; }
.courseos-app .ai-run-status.idle { border: 1px solid var(--cos-line); color: var(--cos-muted); background: var(--cos-surface-soft); }
.courseos-app .ai-run-status.running { border: 1px solid #b9d2fa; color: #31569e; background: #edf3ff; }
.courseos-app .ai-run-status.awaiting_review { border: 1px solid #f0d4a5; color: #9a641d; background: #fff8ea; }
.courseos-app .ai-run-status.completed { border: 1px solid #c7e3d2; color: #167046; background: #effaf3; }
.courseos-app .ai-run-status.failed { border: 1px solid #edc1c1; color: #a34141; background: #fff1f1; }
.courseos-app .ai-run-timeline { display: grid; gap: 0; margin-top: 15px; }
.courseos-app .ai-run-step { display: grid; grid-template-columns: 28px minmax(0, 1fr) auto; align-items: center; gap: 9px; min-height: 52px; border-top: 1px solid var(--cos-line); }
.courseos-app .ai-run-step-index { display: grid; place-items: center; width: 22px; height: 22px; border: 1px solid var(--cos-line-strong); border-radius: 50%; color: var(--cos-muted); background: var(--cos-surface); font-size: 9px; }
.courseos-app .ai-run-step.done .ai-run-step-index { border-color: #a6d1b5; color: #167046; background: #effaf3; }
.courseos-app .ai-run-step.active .ai-run-step-index { border-color: #a8c1f4; color: #31569e; background: var(--cos-primary-soft); }
.courseos-app .ai-run-step.failed .ai-run-step-index { border-color: #e5b7b7; color: #a34141; background: #fff1f1; }
.courseos-app .ai-run-step b,
.courseos-app .ai-run-step span { display: block; }
.courseos-app .ai-run-step b { color: var(--cos-ink); font-size: 10px; }
.courseos-app .ai-run-step span { margin-top: 3px; color: var(--cos-muted); font-size: 9px; }
.courseos-app .ai-run-step em { color: var(--cos-muted); font-size: 8px; font-style: normal; }
.courseos-app .ai-run-step.active em { color: #31569e; }
.courseos-app .ai-run-step.done em { color: #167046; }
.courseos-app .ai-run-empty { display: grid; gap: 5px; padding: 22px 10px; text-align: center; color: var(--cos-muted); }
.courseos-app .ai-run-empty b { color: var(--cos-ink); font-size: 11px; }
.courseos-app .ai-run-empty span { font-size: 9px; line-height: 1.6; }
.courseos-app .ai-run-error { margin-top: 12px; padding: 10px; border: 1px solid #edc1c1; border-radius: 8px; background: #fff5f5; color: #a34141; font-size: 10px; line-height: 1.6; }
.courseos-app .ai-run-output { margin-top: 14px; border-top: 1px solid var(--cos-line); padding-top: 14px; }
.courseos-app .ai-run-output-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; color: var(--cos-ink); font-size: 10px; font-weight: 700; }
.courseos-app .ai-run-output-head small { color: var(--cos-muted); font-size:13px; font-weight: 400; }
.courseos-app .ai-run-output pre { max-height: 240px; margin: 9px 0 0; overflow: auto; white-space: pre-wrap; word-break: break-word; color: var(--cos-ink-soft); font: 10px/1.75 inherit; }
.courseos-app .ai-context-card { padding: 13px; border: 1px solid var(--cos-line); border-radius: 10px; background: var(--cos-surface); }
.courseos-app .ai-context-card + .ai-context-card { margin-top: 12px; }
.courseos-app .ai-context-card-head { align-items: center; }
.courseos-app .ai-context-card-head > span { color: var(--cos-muted); font-size: 8px; }
.courseos-app .ai-context-summary,
.courseos-app .ai-deliverables-card > p { margin: 9px 0 12px; color: var(--cos-muted); font-size: 9px; line-height: 1.6; }
.courseos-app .ai-deliverables-card > p{font-size:13px}
.courseos-app .ai-agent-upload { display: block; padding: 9px; border: 1px dashed #a8c1f4; border-radius: 7px; color: #31569e; background: var(--cos-primary-soft); font-size: 9px; text-align: center; cursor: pointer; }
.courseos-app .ai-agent-upload input { display: none; }
.courseos-app .ai-context-panel .ai-asset-list { display: grid; gap: 5px; margin-top: 9px; }
.courseos-app .ai-context-panel .ai-asset-row { display: flex; align-items: center; gap: 7px; padding: 7px; border-top: 1px solid var(--cos-line); }
.courseos-app .ai-context-panel .ai-asset-row:first-child { border-top: 0; }
.courseos-app .ai-context-panel .ai-asset-copy { min-width: 0; flex: 1; }
.courseos-app .ai-context-panel .ai-asset-copy b,
.courseos-app .ai-context-panel .ai-asset-copy small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.courseos-app .ai-context-panel .ai-asset-copy b { color: var(--cos-ink); font-size: 9px; }
.courseos-app .ai-context-panel .ai-asset-copy small { margin-top: 3px; color: var(--cos-muted); font-size:13px; }
.courseos-app .ai-deliverables-card .ai-execution-row { display: grid; gap: 8px; padding: 10px 0; border-top: 1px solid var(--cos-line); }
.courseos-app .ai-deliverables-card .ai-execution-title b,
.courseos-app .ai-deliverables-card .ai-execution-title span { display: block; }
.courseos-app .ai-deliverables-card .ai-execution-title b { color: var(--cos-ink); font-size: 10px; }
.courseos-app .ai-deliverables-card .ai-execution-title span { margin-top: 3px; color: var(--cos-muted); font-size: 8px; }
.courseos-app .ai-deliverables-card .ai-execution-row label { display: grid; gap: 4px; color: var(--cos-muted); font-size: 8px; }
.courseos-app .ai-deliverables-card .ai-execution-row input,
.courseos-app .ai-deliverables-card .ai-execution-row select { width: 100%; border: 1px solid var(--cos-line); border-radius: 6px; padding: 6px; color: var(--cos-ink); background: var(--cos-surface); font: inherit; font-size: 9px; }
.courseos-app .ai-agent-chat-secondary { margin: 16px 20px 20px; border: 1px solid var(--cos-line); border-radius: 10px; background: var(--cos-surface-soft); }
.courseos-app .ai-agent-chat-secondary summary { padding: 11px 13px; color: var(--cos-ink-soft); cursor: pointer; font-size: 10px; font-weight: 700; }
.courseos-app .ai-agent-chat-secondary .ai-message-list { max-height: 260px; padding: 12px 13px; overflow: auto; border-top: 1px solid var(--cos-line); }
.courseos-app .ai-agent-chat-secondary .ai-ops-refine { padding: 11px 13px; border-top: 1px solid var(--cos-line); }

@media (max-width: 1180px) {
  .courseos-app .ai-agent-layout { grid-template-columns: 190px minmax(0, 1fr) 260px; }
  .courseos-app .ai-agent-launch-grid { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .courseos-app .ai-agent-layout { grid-template-columns: 190px minmax(0, 1fr); }
  .courseos-app .ai-agent-context-panel { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; border-top: 1px solid var(--cos-line); border-left: 0; }
  .courseos-app .ai-context-card + .ai-context-card { margin-top: 0; }
}
@media (max-width: 680px) {
  .courseos-app .ai-agent-layout { display: block; }
  .courseos-app .ai-agent-queue { border-right: 0; border-bottom: 1px solid var(--cos-line); }
  .courseos-app .ai-agent-queue .ai-session-list { display: flex; max-height: none; overflow: auto; }
  .courseos-app .ai-agent-queue .ai-session-item { min-width: 170px; }
  .courseos-app .ai-agent-context-panel { display: block; }
  .courseos-app .ai-context-card + .ai-context-card { margin-top: 12px; }
  .courseos-app .ai-agent-command-head,
  .courseos-app .ai-agent-launch-head { display: block; }
  .courseos-app .ai-agent-command-actions { margin-top: 12px; }
  .courseos-app .ai-agent-launch-card,
  .courseos-app .ai-agent-execution-card { margin-right: 12px; margin-left: 12px; }
  .courseos-app .ai-agent-chat-secondary { margin-right: 12px; margin-left: 12px; }
}

/* Shared interaction polish: stable controls, visible keyboard focus and clear pending states. */
.courseos-app button,
.courseos-app a,
.courseos-app input,
.courseos-app select,
.courseos-app textarea,
.learning-child button,
.learning-child a,
.learning-child input,
.learning-child select,
.learning-child textarea {
  -webkit-tap-highlight-color: transparent;
}

.courseos-app button:focus-visible,
.courseos-app a:focus-visible,
.courseos-app input:focus-visible,
.courseos-app select:focus-visible,
.courseos-app textarea:focus-visible,
.learning-child button:focus-visible,
.learning-child a:focus-visible,
.learning-child input:focus-visible,
.learning-child select:focus-visible,
.learning-child textarea:focus-visible {
  outline: 3px solid rgba(22, 118, 109, .24);
  outline-offset: 2px;
}

.courseos-app button:disabled,
.learning-child button:disabled,
.courseos-app [aria-busy="true"],
.learning-child [aria-busy="true"] {
  cursor: wait;
  opacity: .62;
}

.courseos-app .view,
.courseos-app .inst-view,
.learning-admin #learningStudio,
.learning-child #studentLearning {
  min-width: 0;
  overflow-wrap: anywhere;
}

@media (prefers-reduced-motion: reduce) {
  .courseos-app *,
  .learning-child * {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}

/* Institution navigation uses the same shell geometry as the platform. */
.courseos-app .institution-shell.visible { display: grid; grid-template-columns: 244px minmax(0, 1fr); }
.courseos-app .institution-side {
  display: flex; flex-direction: column; align-items: stretch; flex-wrap: nowrap;
  gap: 0; width: auto; height: 100%; min-height: 0; padding: 18px 12px 14px;
  overflow-x: hidden; overflow-y: auto; overscroll-behavior-y: contain;
  border-right: 1px solid var(--cos-line); border-bottom: 0; white-space: normal;
}
.courseos-app .institution-logo { position: relative; flex: none; gap: 10px; min-height: 62px; padding: 0 36px 24px 10px; width: auto; }
.courseos-app .institution-logo .brand-mark { flex-shrink: 0; }
.courseos-app .institution-logo .brand-copy { display: block; min-width: 0; }
.courseos-app .institution-logo b { display: block; font-size: 17px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.courseos-app .institution-logo small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.courseos-app .institution-nav-label { display: block; flex: none; }
.courseos-app .institution-side .institution-nav { flex: none; width: 100%; min-height: 40px; padding: 9px 12px; gap: 10px; margin: 0 0 3px; }
.courseos-app .institution-nav > .icon { display: inline-flex; align-items: center; justify-content: center; flex: 0 0 24px; width: 24px; height: 24px; font-size: 22px; line-height: 1; }
.courseos-app .institution-side .inst-exit { flex: none; width: 100%; min-height: 40px; margin-top: auto; padding: 10px; }
.courseos-app .institution-side .courseos-switch-account { flex: none; }
.courseos-app .institution-side .institution-sidebar-footer { flex: none; margin-top: auto; padding-top: 14px; }
.courseos-app .institution-side .institution-sidebar-footer .institution-nav { margin-bottom: 10px; }
.courseos-app .institution-side .institution-sidebar-footer .inst-exit { margin-top: 0; }
.courseos-app .institution-main { height: 100%; min-height: 0; overflow: auto; scrollbar-gutter: stable; scroll-padding-top: 100px; }
.courseos-app .institution-top {
  position: sticky; top: 0; z-index: 35; display: flex; grid-template-columns: none;
  height: 72px; min-height: 72px; padding: 0 32px; gap: 10px; background: var(--cos-surface);
}
.courseos-app .institution-crumb { min-width: 0; white-space: nowrap; }
.courseos-app .institution-crumb .top-kicker { font-size: 13px; overflow: hidden; text-overflow: ellipsis; max-width: 260px; }
.courseos-app .institution-crumb #instTitle { flex: none; font-size: 13px; }
.courseos-app .institution-top .institution-global-search { grid-column: auto; grid-row: auto; width: min(330px, 30vw); flex-shrink: 0; margin: 0 18px 0 auto; }
.courseos-app .institution-top-actions { flex: none; }
.courseos-app .institution-top .institution-user { display: flex; align-items: center; gap: 9px; margin: 0 0 0 10px; padding: 0; border: 0; background: transparent; }
.courseos-app .institution-top .institution-user b { font-size: 13px; font-weight: 500; white-space: nowrap; }
.courseos-app .institution-top .institution-user small { display: none; }
.mobile-institution-menu, .mobile-institution-search, .mobile-institution-scrim { display: none; }
@media (min-width: 721px) {
  .courseos-app .institution-shell.sidebar-collapsed { grid-template-columns: 76px minmax(0, 1fr); }
  .courseos-app .sidebar-collapsed .institution-side { padding: 18px 8px 14px; }
  .courseos-app .sidebar-collapsed .institution-logo { flex-direction: column; gap: 8px; padding: 0 0 10px; }
  .courseos-app .sidebar-collapsed .institution-logo .brand-copy { display: none; }
  .courseos-app .sidebar-collapsed .institution-logo .sidebar-toggle { position: static; flex-shrink: 0; }
  .courseos-app .sidebar-collapsed .institution-logo .sidebar-toggle svg { transform: rotate(180deg); }
  .courseos-app .sidebar-collapsed .institution-nav-label { padding: 15px 0 7px; text-align: center; font-size: 10px; letter-spacing: 0; white-space: nowrap; }
  .courseos-app .sidebar-collapsed .institution-side .institution-nav { justify-content: center; gap: 0; padding: 9px 0; min-height: 44px; }
  .courseos-app .sidebar-collapsed .institution-nav > span:not(.icon),
  .courseos-app .sidebar-collapsed .institution-nav > i { display: none; }
  .courseos-app .sidebar-collapsed .institution-side .inst-exit,
  .courseos-app .sidebar-collapsed .institution-side .courseos-switch-account { font-size: 0; padding: 0; width: 100%; min-height: 40px; }
  .courseos-app .sidebar-collapsed .institution-side .inst-exit::before { content: '←'; font-size: 20px; }
  .courseos-app .sidebar-collapsed .institution-side .courseos-switch-account::before { content: '⇄'; font-size: 20px; }
}
@media (max-width: 1000px) and (min-width: 721px) {
  .courseos-app .institution-top { padding: 0 24px; }
  .courseos-app .institution-crumb .top-kicker { max-width: 130px; }
  .courseos-app .institution-top .institution-global-search { width: min(240px, 26vw); margin-right: 0; }
  .courseos-app .institution-top .institution-user > div:not(.avatar), .courseos-app .institution-top .institution-user > span { display: none; }
}
@media (max-width: 720px) {
  .courseos-app .institution-shell.visible { grid-template-columns: minmax(0, 1fr); }
  .courseos-app .institution-top { padding: 0 16px; gap: 9px; }
  .courseos-app .mobile-institution-menu, .courseos-app .mobile-institution-search { display: grid; flex: none; width: 34px; height: 34px; padding: 0; }
  .courseos-app .institution-crumb { flex: 1; overflow: hidden; }
  .courseos-app .institution-crumb .top-kicker, .courseos-app .institution-crumb > span:nth-child(2) { display: none; }
  .courseos-app .institution-top .institution-user { margin-left: 0; }
  .courseos-app .institution-top .institution-user > div:not(.avatar), .courseos-app .institution-top .institution-user > span { display: none; }
  .courseos-app .institution-top .institution-global-search { display: none; }
  .courseos-app .institution-shell.mobile-search-open .institution-top { flex-wrap: wrap; height: auto; padding-top: 16px; padding-bottom: 16px; }
  .courseos-app .institution-shell.mobile-search-open .institution-global-search { display: flex; order: 10; flex: 0 0 100%; width: 100%; min-width: 0; margin: 0; }
  .courseos-app .institution-side { position: fixed; inset: 0 auto 0 0; width: min(268px, calc(100vw - 48px)); z-index: 40; transform: translateX(-105%); transition: transform .2s ease; box-shadow: 18px 0 36px rgba(32,37,35,.12); visibility: hidden; }
  .courseos-app .institution-shell.mobile-nav-open .institution-side { transform: translateX(0); visibility: visible; }
  .courseos-app .institution-logo .sidebar-toggle { display: none; }
  .courseos-app .mobile-institution-scrim:not([hidden]) { display: block; position: fixed; inset: 0; z-index: 39; padding: 0; border: 0; background: rgba(32,37,35,.28); }
}

/* Collapsible platform navigation. */
.courseos-app .sidebar .brand { position: relative; padding-right: 36px; min-height: 62px; }
.courseos-app .sidebar .brand-mark { flex-shrink: 0; }
.courseos-app .sidebar .brand-copy { min-width: 0; }
.courseos-app .sidebar-toggle {
  position: absolute; right: 0; top: 9px; width: 28px; height: 28px;
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0; border: 1px solid transparent; border-radius: 7px;
  background: transparent; color: var(--cos-muted); cursor: pointer;
}
.courseos-app .sidebar-toggle:hover { background: var(--cos-primary-soft); color: var(--cos-primary); }
.courseos-sidebar-tip {
  position: fixed;
  z-index: 10000;
  padding: 8px 14px;
  border-radius: 4px;
  background: #252b30;
  color: #fff;
  font-size: 12px;
  line-height: 20px;
  max-width: calc(100vw - 16px);
  box-sizing: border-box;
  white-space: nowrap;
  pointer-events: none;
  box-shadow: 0 4px 12px rgba(0, 0, 0, .14);
}
.courseos-sidebar-tip[hidden] { display: none; }
.courseos-sidebar-tip::before {
  content: '';
  position: absolute;
  left: -5px;
  top: calc(50% - 5px);
  width: 10px;
  height: 10px;
  background: inherit;
  transform: rotate(45deg);
}
.courseos-app .sidebar-toggle:focus-visible { outline: 2px solid var(--cos-primary); outline-offset: 2px; }
@media (min-width: 721px) {
  .courseos-app .app { grid-template-columns: 244px minmax(0, 1fr); }
  .courseos-app .sidebar { padding: 18px 12px 14px; }
  .courseos-app .sidebar .brand-copy { display: block; }
  .courseos-app .sidebar .nav button { justify-content: flex-start; }
  .courseos-app .sidebar .nav button span:last-child { display: inline; }
  .courseos-app .sidebar .section-label, .courseos-app .sidebar .side-bottom { display: block; }
  .courseos-app .app.sidebar-collapsed { grid-template-columns: 76px minmax(0, 1fr); }
  .courseos-app .sidebar-collapsed .sidebar { padding: 18px 8px 14px; }
  .courseos-app .sidebar-collapsed .brand { flex-direction: column; gap: 8px; padding: 0 0 10px; }
  .courseos-app .sidebar-collapsed .brand-copy { display: none; }
  .courseos-app .sidebar-collapsed .sidebar-toggle { position: static; flex-shrink: 0; }
  .courseos-app .sidebar-collapsed .sidebar-toggle svg { transform: rotate(180deg); }
  .courseos-app .sidebar-collapsed .section-label { padding: 15px 0 7px; text-align: center; font-size: 10px; letter-spacing: 0; white-space: nowrap; }
  .courseos-app .sidebar-collapsed .sidebar .nav button { justify-content: center; gap: 0; padding: 9px 0; min-height: 44px; width: 100%; }
  .courseos-app .sidebar-collapsed .sidebar .nav button > span:not(.icon) { display: none; }
  .courseos-app .sidebar-collapsed .side-bottom { padding-top: 14px; }
  .courseos-app .sidebar-collapsed .preview-institution,
  .courseos-app .sidebar-collapsed .side-bottom .courseos-switch-account { font-size: 0; padding: 0; width: 100%; min-height: 40px; }
  .courseos-app .sidebar-collapsed .preview-institution::before { content: '▷'; font-size: 20px; }
  .courseos-app .sidebar-collapsed .side-bottom .courseos-switch-account::before { content: '⇄'; font-size: 20px; }
  .courseos-app .sidebar-collapsed .profile { justify-content: center; padding: 14px 0 0; }
  .courseos-app .sidebar-collapsed .profile > div:not(.avatar) { display: none; }
}

/* Shared admin dialogs must load even when the legacy institution UI is skipped. */
.live-admin-modal{display:none;position:fixed;inset:0;background:#17212b88;z-index:130;align-items:center;justify-content:center;padding:20px;box-sizing:border-box;overflow:auto}
.live-admin-modal.open{display:flex}
.live-admin-dialog{width:min(620px,100%);max-height:90vh;box-sizing:border-box;overflow:auto;background:#fff;border-radius:13px;padding:23px;box-shadow:0 25px 80px #17212b40}
.live-admin-dialog h2{font-size:19px;margin:6px 0}
.live-admin-dialog p{color:#728083;font-size:13px;line-height:1.6;margin:0}
.live-admin-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.live-admin-field{display:block;margin:14px 0}
.live-admin-field.full{grid-column:1/-1}
.live-admin-field span{display:block;color:#728083;font-size:10px;margin-bottom:6px}
.live-admin-field input,.live-admin-field select,.live-admin-field textarea{width:100%;box-sizing:border-box;border:1px solid #dfe7e3;border-radius:8px;padding:10px 11px;background:#fff;outline:0}
.live-admin-products{display:grid;grid-template-columns:1fr 1fr;gap:8px;background:#f5faf7;border:1px solid #dcece5;border-radius:9px;padding:12px}
.live-admin-products label{font-size:10px;color:#5d6b6e}
.live-admin-products input{accent-color:#087f78;margin-right:6px}
.live-admin-foot{display:flex;justify-content:flex-end;gap:8px;margin-top:19px}
.live-admin-status{min-height:17px;color:#bd6b3b;font-size:10px;margin-top:9px}
@media(max-width:650px){.live-admin-grid,.live-admin-products{grid-template-columns:1fr}
.live-admin-field.full{grid-column:auto}
}

.live-admin-dialog .interaction-dialog-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}
.live-admin-field textarea{resize:vertical}

/* Service expiry badges: inactive, expired, urgent, upcoming and valid. */
.courseos-app #org .org-status.org-expiry{font-weight:500;border-radius:6px;padding:4px 10px}
.courseos-app #org .org-status.org-expiry-inactive,
.courseos-app #org .org-status.org-expiry-unset{background:#eef0f3;color:#667085}
.courseos-app #org .org-status.org-expiry-expired{background:#f8e4e7;color:#8b2635}
.courseos-app #org .org-status.org-expiry-urgent{background:#ffead5;color:#9a460d}
.courseos-app #org .org-status.org-expiry-soon{background:#fff3bf;color:#855b00}
.courseos-app #org .org-status.org-expiry-active{background:#e9f8f2;color:#218963}

/* Consistent state colors across institution detail tabs and their lists. */
.courseos-app #org .org-status.org-state{border-radius:6px;font-weight:500}
.courseos-app #org .org-status.org-state-success{background:#e9f8f2;color:#218963}
.courseos-app #org .org-status.org-state-muted{background:#eef0f3;color:#667085}
.courseos-app #org .org-status.org-state-danger{background:#f8e4e7;color:#8b2635}
.courseos-app #org .org-status.org-state-pending{background:#fff3bf;color:#855b00}
.courseos-app #org .org-status.org-state-info{background:#eaf1ff;color:#345fba}

/* Shared headquarters and institution AI studio; loaded after legacy rules. */
.courseos-app .institution-content:has(#instMaterials.active) { width: 100%; max-width: none; margin: 0; padding: 16px 18px 24px; }
.courseos-app .content:has(> #aiStudio.active) {
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 16px 18px 24px;
}
.courseos-app :is(#aiStudio, #instMaterials) {
  --ai-ink: #292a2d;
  --ai-muted: #85868b;
  --ai-line: #ececee;
  color: var(--ai-ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}
.courseos-app :is(#aiStudio, #instMaterials),
.courseos-app :is(#aiStudio, #instMaterials) [data-ai-workspace-app],
.courseos-app :is(#aiStudio, #instMaterials) .ai-ops-page { width: 100%; min-width: 0; max-width: none; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-ops-header { margin: 0; padding: 0 2px 18px; border: 0; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-ops-header h1 { font-size: 20px; font-weight: 600; color: var(--ai-ink); }
.courseos-app :is(#aiStudio, #instMaterials) .ai-ops-header p { color: var(--ai-muted); font-size: 12px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-connection { padding: 5px 10px; background: #fff; border: 1px solid var(--ai-line); border-radius: 20px; font-size: 11px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-layout {
  grid-template-columns: 280px minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr);
  height: max(520px, calc(100dvh - 170px));
  min-height: 0;
  border: 1px solid var(--ai-line);
  border-radius: 14px;
  box-shadow: none;
  background: #fff;
}
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-layout.panel-closed { grid-template-columns: minmax(0, 1fr); }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation { grid-column: 2; grid-row: 1; min-width: 0; background: #fff; }
.courseos-app :is(#aiStudio, #instMaterials) .panel-closed .ai-agent-conversation { grid-column: 1; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-side {
  grid-column: 1; grid-row: 1; width: auto; min-width: 0;
  padding: 20px 12px; background: #fafafa;
  border: 0; border-right: 1px solid var(--ai-line); overflow: auto;
}
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-side-head h3 { font-size: 12px; color: #77787d; font-weight: 500; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-icon-button { color: #77787d; border-color: transparent; background: transparent; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-new-conversation {
  width: 100%; margin: 12px 0 8px; padding: 10px 12px; border: 1px solid #e4e4e7;
  border-radius: 8px; background: #fff; color: var(--ai-ink); text-align: left; font-size: 13px;
}
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-side .ai-session-list { max-height: none; gap: 5px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-item { border: 0; padding: 11px 12px; border-radius: 8px; background: transparent; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-item.active { background: #ededee; border: 0; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-item:hover { background: #f0f0f1; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-item b { color: #44454a; font-size: 12px; font-weight: 500; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-item span { color: #96979c; font-size: 10px; line-height: 1.5; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation-head { padding: 16px 24px; border: 0; gap: 12px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation-head small { display: none; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation-head h2 { margin: 0 0 5px; color: var(--ai-ink); font-size: 14px; font-weight: 600; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation-head p { color: var(--ai-muted); font-size: 11px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation-actions { flex-wrap: wrap; justify-content: flex-end; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation-actions button { min-height: 30px; padding: 6px 9px; color: #66676c; border: 1px solid var(--ai-line); border-radius: 7px; background: #fff; font-size: 11px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation .ai-message-list {
  display: flex; flex-direction: column; padding: 24px max(28px, calc((100% - 760px) / 2)); background: #fff;
}
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-welcome {
  margin: auto; width: 100%; padding: 36px 0; border: 0; border-radius: 0;
  background: transparent; text-align: center;
}
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-welcome > span { color: #a0a1a6; font-size: 13px; font-weight: 500; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-welcome h3 { margin: 14px 0 10px; color: var(--ai-ink); font-size: clamp(20px, 2vw, 26px); font-weight: 500; line-height: 1.5; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-welcome p { max-width: 430px; margin: 0 auto; font-size: 13px; color: #909197; line-height: 1.8; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-suggestions { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 22px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-suggestions button { padding: 9px 13px; border: 1px solid #e8e8eb; border-radius: 9px; background: #fff; color: #66676d; font-size: 12px; }
.courseos-app :is(#aiStudio, #instMaterials) button:hover:not(:disabled) { cursor: pointer; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-suggestions button:hover,
.courseos-app :is(#aiStudio, #instMaterials) .ai-new-conversation:hover { background: #f5f5f6; border-color: #d5d5da; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation .ai-message { flex-shrink: 0; max-width: 90%; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation .ai-message-meta { font-size: 11px; color: #999aa0; font-weight: 400; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation .ai-message-bubble { padding: 14px 16px; border: 0; border-radius: 14px; background: #fff; color: #34353a; font-size: 14px; line-height: 1.85; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation .ai-message-request .ai-message-bubble { background: #f2f2f3; border: 0; color: #34353a; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation .ai-ops-refine {
  flex: none; width: calc(100% - 56px); max-width: 760px; margin: 8px auto 22px; padding: 14px 16px 10px;
  border: 1px solid #e6e6e9; border-radius: 20px; background: #fff; box-shadow: 0 3px 18px #00000006;
}
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-input-label { color: #929399; font-size: 11px; font-weight: 400; margin-bottom: 5px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation .ai-ops-refine > div { display: flex; align-items: flex-end; gap: 12px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation .ai-ops-refine textarea {
  display: block; flex: 1; min-width: 0; width: 100%; min-height: 54px; max-height: 160px;
  padding: 4px 0; border: 0; border-radius: 0; background: transparent; color: var(--ai-ink);
  box-shadow: none; resize: vertical; font: inherit; font-size: 14px; line-height: 1.7;
}
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation .ai-ops-refine textarea:focus { outline: none; box-shadow: none; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-ops-refine:focus-within { border-color: #a7bbec; box-shadow: 0 0 0 3px #edf2fd; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation .ai-ops-refine button { min-height: 36px; padding: 8px 14px; border-radius: 12px; background: #3b7bfa; border-color: #3b7bfa; color: #fff; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-compose-hint { display: flex; justify-content: space-between; gap: 8px; margin: 10px 0 0; color: #a1a2a8; font-size: 10px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-compose-upload-bar { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; margin-top: 10px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation .ai-ops-refine .ai-compose-upload-button { min-height: 28px; padding: 5px 10px; border: 1px solid #e6e6ea; border-radius: 8px; background: #fafafa; color: #64656b; font-size: 11px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-compose-upload-bar > span { color: #93949b; font-size: 10px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-compose-upload-bar input[hidden],
.courseos-app :is(#aiStudio, #instMaterials) .ai-compose-assets[hidden] { display: none; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation .ai-ops-refine > .ai-compose-assets:not([hidden]) { display: flex; align-items: stretch; flex-wrap: wrap; gap: 8px; max-height: 150px; overflow: auto; margin-bottom: 12px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-compose-asset { display: flex; align-items: center; gap: 8px; min-width: 0; width: min(100%, 260px); padding: 8px; border: 1px solid #e8e8ec; border-radius: 10px; background: #fafafa; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-compose-asset > img { width: 32px; height: 32px; flex: none; border-radius: 5px; object-fit: cover; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-compose-file-type { flex: none; width: 32px; color: #93949b; font-size: 10px; text-align: center; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-compose-asset > div { flex: 1; min-width: 0; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-compose-asset b { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 11px; font-weight: 500; color: #5d5e65; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-compose-asset small { display: block; margin-top: 3px; color: #999aa1; font-size: 10px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation .ai-ops-refine .ai-compose-asset button { flex: none; min-height: 24px; padding: 3px; border: 0; background: transparent; color: #97989e; font-size: 10px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-side,
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-side .ai-session-list { overflow-x: hidden; min-width: 0; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-row { display: flex; align-items: center; width: 100%; min-width: 0; border-radius: 8px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-row.active { background: #ededee; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-row .ai-session-item { flex: 1; width: 0; min-width: 0; overflow: hidden; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-item b,
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-item span { display: block; min-width: 0; max-width: 100%; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-manage { flex: none; width: 32px; padding: 6px 2px; margin-right: 5px; border: 0; border-radius: 5px; background: transparent; color: #8a8b91; font-size: 10px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-manage:hover { background: #e2e2e5; color: #36373d; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-new-group { width: 100%; padding: 7px 12px; border: 0; background: transparent; color: #82838a; text-align: left; font-size: 12px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-group { min-width: 0; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-group summary { display: flex; align-items: center; gap: 5px; min-width: 0; padding: 12px 4px 8px; color: #66676e; font-size: 12px; cursor: pointer; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-group summary::before { content: '▸'; flex: none; width: 9px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-group[open] > summary::before { content: '▾'; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-group summary::-webkit-details-marker { display: none; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-group summary .ai-group-title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-group summary small { flex: none; color: #a0a1a7; font-size: 10px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-group .ai-group-action { display: inline-flex; align-items: center; justify-content: center; flex: none; width: 26px; height: 26px; padding: 5px; border: 0; border-radius: 4px; background: transparent; color: #82838a; cursor: pointer; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-group .ai-group-action svg { display: block; width: 16px; height: 16px; pointer-events: none; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-group .ai-group-action:hover { background: #e2e2e5; color: #36373d; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-group .ai-group-action:focus-visible { outline: 2px solid #66676e; outline-offset: 1px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-group .ai-group-action:disabled { opacity: .5; cursor: wait; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-group > div { display: grid; gap: 4px; padding-left: 6px; min-width: 0; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-group-empty { padding: 8px; margin: 0; color: #a0a1a7; font-size: 11px; line-height: 1.7; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-ungrouped-label { padding: 12px 4px 5px; color: #93949b; font-size: 11px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation-head > div:first-child,
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail-head > div { flex: 1; min-width: 0; overflow: hidden; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail-head h2,
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail-head p { max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-manager { width: min(420px, calc(100vw - 32px)); padding: 24px; border: 1px solid #e5e5e8; border-radius: 14px; background: #fff; box-shadow: 0 20px 80px #00000026; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-manager:not([open]) { display: none; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-manager::backdrop { background: #20212650; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-manager form { display: grid; gap: 18px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-manager header { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-manager h2 { margin: 0; font-size: 17px; color: #292a2d; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-manager label { display: grid; gap: 8px; color: #77787e; font-size: 12px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-manager label[hidden] { display: none; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-manager input { width: 100%; min-width: 0; padding: 10px 12px; border: 1px solid #dfdfe4; border-radius: 8px; font: inherit; color: #34353a; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-manager footer { display: flex; justify-content: flex-end; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-manager [role="alert"] { margin: 0; color: #b45252; font-size: 12px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail {
  width: min(760px, calc(100vw - 40px)); max-height: calc(100dvh - 64px); padding: 0;
  border: 1px solid #e5e5e8; border-radius: 16px; background: #fff; color: var(--ai-ink);
  box-shadow: 0 24px 100px #00000026; overflow: auto;
}
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail:not([open]) { display: none; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail::backdrop { background: #20212650; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail-head { position: sticky; top: 0; z-index: 1; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 22px 28px; border-bottom: 1px solid var(--ai-line); background: #fff; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail-head small { font-size: 11px; color: #93949a; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail-head h2 { margin: 5px 0; font-size: 18px; color: var(--ai-ink); }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail-head p { margin: 0; font-size: 12px; color: var(--ai-muted); }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail-head button { flex: none; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail-body { padding: 18px 28px 28px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail .ai-agent-side-section { margin-top: 20px; padding: 20px 0 0; border: 0; border-top: 1px solid var(--ai-line); border-radius: 0; background: #fff; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail h3 { margin: 0 0 12px; font-size: 13px; color: #494a50; font-weight: 600; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail .ai-agent-side-section > label { display: block; margin-bottom: 8px; color: var(--ai-muted); font-size: 12px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail select { width: 100%; border: 1px solid #e1e1e5; border-radius: 8px; min-height: 40px; font-size: 13px; background: #fff; color: #45464c; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail .ai-agent-side-section > p { margin: 8px 0 0; color: var(--ai-muted); font-size: 12px; line-height: 1.7; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-detail-suggestions .ai-agent-suggestions { justify-content: flex-start; margin-top: 12px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail .ai-ops-roles { display: flex; gap: 4px; padding: 4px; border: 0; border-radius: 9px; background: #f4f4f5; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail .ai-ops-roles button { flex: 1; border: 0; padding: 8px; background: transparent; border-radius: 6px; font-size: 12px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail .ai-ops-roles button.active { background: #fff; color: #33343a; box-shadow: 0 1px 4px #0000000d; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail .ai-ops-tasks { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin-top: 12px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail .ai-ops-tasks button { border: 1px solid #ededf0; padding: 12px; background: #fff; border-radius: 9px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail .ai-ops-tasks button.active { background: #f5f7fc; border-color: #dbe3f5; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail .ai-ops-tasks button b { font-size: 12px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail .ai-ops-tasks button span { color: var(--ai-muted); font-size: 11px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-session-actions { margin: 0; justify-content: flex-start; gap: 8px; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-session-actions button { flex: none; padding: 7px 12px; font-size: 11px; color: #6b6c72; border-color: #e8e8eb; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-agent-details summary { color: #494a50; font-size: 13px; }
.courseos-app :is(#aiStudio, #instMaterials) button:focus-visible,
.courseos-app :is(#aiStudio, #instMaterials) select:focus-visible { outline: 2px solid #8aacf5; outline-offset: 3px; }
@media (max-width: 1050px) {
  .courseos-app :is(#aiStudio, #instMaterials) .ai-agent-layout { grid-template-columns: 240px minmax(0, 1fr); }
  .courseos-app :is(#aiStudio, #instMaterials) .ai-agent-layout.panel-closed { grid-template-columns: minmax(0, 1fr); }
  .courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation-head { padding: 14px 18px; flex-wrap: wrap; }
}
@media (max-width: 760px) {
  .courseos-app :is(#aiStudio, #instMaterials) .ai-agent-layout { position: relative; display: grid; grid-template-columns: minmax(0, 1fr); height: max(500px, calc(100dvh - 160px)); }
  .courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation { grid-column: 1; height: 100%; }
  .courseos-app :is(#aiStudio, #instMaterials) .ai-agent-side { position: absolute; inset: 0 auto 0 0; z-index: 3; width: min(280px, 85%); height: 100%; box-shadow: 12px 0 30px #00000012; }
  .courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation .ai-message-list { padding: 20px 16px; }
  .courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation .ai-ops-refine { width: calc(100% - 24px); margin-bottom: 14px; }
  .courseos-app :is(#aiStudio, #instMaterials) .ai-agent-welcome h3 { font-size: 21px; }
  .courseos-app :is(#aiStudio, #instMaterials) .ai-agent-conversation-actions { justify-content: flex-start; }
  .courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail { width: calc(100vw - 24px); max-height: calc(100dvh - 24px); border-radius: 12px; }
  .courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail-head { padding: 18px; }
  .courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail-body { padding: 16px 18px 24px; }
  .courseos-app :is(#aiStudio, #instMaterials) .ai-session-detail .ai-ops-tasks { grid-template-columns: 1fr; }
  .courseos-app :is(#aiStudio, #instMaterials) .ai-compose-hint span { display: none; }
}


.courseos-app :is(#aiStudio, #instMaterials) .ai-session-delete { display: inline-flex; align-items: center; justify-content: center; flex: none; width: 26px; height: 28px; padding: 5px; margin-right: 5px; border: 0; border-radius: 5px; background: transparent; color: #8a8b91; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-delete svg { display: block; width: 16px; height: 16px; pointer-events: none; }
.courseos-app :is(#aiStudio, #instMaterials) .ai-session-delete:hover { background: #fbe9e9; color: #bf3c3c; }

/* Parent-facing lesson guide: presentation only, existing asset controls retained. */
.courseos-app .platform-parent-guide.platform-knowledge-grid {
  display: block; max-width: 1280px; padding: 0; border: 0;
  background: transparent; box-shadow: none; color: #172f43;
}
.courseos-app .platform-parent-guide .platform-guide-hero {
  display: flex; align-items: center; justify-content: space-between; gap: 28px;
  padding: 28px 32px; margin-bottom: 20px; border: 1px solid #d7ebe8;
  border-radius: 14px; background: linear-gradient(115deg, #e9f7f3, #f4faf9);
}
.courseos-app .platform-parent-guide .platform-learning-kicker {
  display: inline-block; padding: 5px 12px; border-radius: 20px;
  background: #d3efea; color: #087e78; font-size: 12px; font-weight: 700;
}
.courseos-app .platform-parent-guide .platform-guide-hero h2 {
  margin: 12px 0 8px; color: #173648; font-size: clamp(24px, 2.2vw, 32px); line-height: 1.35;
}
.courseos-app .platform-parent-guide .platform-guide-hero p { color: #506877; font-size: 15px; }
.courseos-app .platform-parent-guide .platform-guide-meta { display: flex; flex-wrap: wrap; gap: 10px 16px; margin-top: 20px; align-items: center; }
.courseos-app .platform-parent-guide .platform-guide-meta span { font-size: 13px; color: #2c5360; }
.courseos-app .platform-parent-guide .platform-guide-meta small { color: #687e8c; font-size: 12px; }
.courseos-app .platform-parent-guide .platform-learning-actions {
  display: flex; flex-direction: column; align-items: center; flex-shrink: 0; gap: 10px;
  margin: 0; padding: 0; border: 0; background: none;
}
.courseos-app .platform-parent-guide .platform-learning-actions button {
  min-height: 44px; padding: 11px 24px; border: 1px solid #087e78;
  border-radius: 8px; background: #087e78; color: white; font-size: 14px; font-weight: 700; cursor: pointer;
}
.courseos-app .platform-parent-guide .platform-learning-actions button:disabled {
  opacity: 1; background: #edf2f5; color: #7d8f9f; border-color: #d1dce4; cursor: not-allowed;
}
.courseos-app .platform-parent-guide .platform-learning-actions > span { color: #667e8c; font-size: 12px; text-align: center; max-width: 230px; }
.courseos-app .platform-parent-guide .platform-guide-columns { display: grid; grid-template-columns: minmax(0, 2fr) minmax(280px, 1fr); gap: 20px; align-items: start; }
.courseos-app .platform-parent-guide .platform-guide-main,
.courseos-app .platform-parent-guide .platform-guide-aside { display: grid; gap: 18px; min-width: 0; }
.courseos-app .platform-parent-guide section.platform-guide-card {
  padding: 20px; border: 1px solid #e0e8ee; border-radius: 12px; background: #fff; margin: 0; min-width: 0;
}
.courseos-app .platform-parent-guide .platform-guide-card h3 {
  display: flex; gap: 12px; align-items: center; margin: 0 0 14px;
  color: #193548; font-size: 17px; line-height: 1.45;
}
.courseos-app .platform-parent-guide .platform-guide-card h3 i {
  display: inline-flex; justify-content: center; align-items: center; flex: 0 0 34px;
  width: 34px; height: 34px; background: #e5f5f2; color: #087e78; border-radius: 50%; font-style: normal; font-size: 20px;
}
.courseos-app .platform-parent-guide p.platform-guide-placeholder {
  margin: 0; padding: 16px 18px; color: #758795; font-size: 13px; line-height: 1.8;
  background: #f3f6f8; border-radius: 8px;
}
.courseos-app .platform-parent-guide p.platform-guide-content { margin: 0; color: #405767; font-size: 14px; line-height: 1.9; white-space: normal; }
.courseos-app .platform-parent-guide .platform-learning-pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.courseos-app .platform-parent-guide section.platform-learning-homework { background: #fffcf6; border-color: #f2e7d2; }
.courseos-app .platform-parent-guide .platform-learning-homework h3 i { background: #fff0cf; color: #a57528; }
.courseos-app .platform-parent-guide .platform-guide-note { display: block; margin-top: 12px; color: #7c8894; line-height: 1.7; font-size: 12px; }
.courseos-app .platform-parent-guide .platform-guide-context { margin: 18px 0; padding: 18px 20px; border: 1px solid #e0e8ee; border-radius: 12px; background: #fff; }
.courseos-app .platform-parent-guide .platform-guide-context > h3 { margin: 0 0 12px; color: #506877; font-size: 14px; }
.courseos-app .platform-parent-guide .platform-learning-intro { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; margin: 0; padding: 0; border: 0; }
.courseos-app .platform-parent-guide .platform-learning-intro > div { padding: 0; border: 0; }
.courseos-app .platform-parent-guide .platform-learning-intro small { color: #788b96; font-size: 12px; }
.courseos-app .platform-parent-guide .platform-learning-intro h3 { font-size: 14px; color: #2d5361; margin: 5px 0; }
.courseos-app .platform-parent-guide .platform-learning-intro p { font-size: 13px; }
.courseos-app .platform-parent-guide .platform-learning-attachments-head { align-items: start; margin-bottom: 16px; }
.courseos-app .platform-parent-guide .platform-learning-attachments-head h3 { margin-bottom: 4px; }
.courseos-app .platform-parent-guide .platform-learning-attachments-head h3 small { font-size: 12px; font-weight: 400; color: #7d8d99; }
.courseos-app .platform-parent-guide .platform-learning-attachments-head p { font-size: 12px; color: #7d8d99; }
.courseos-app .platform-parent-guide .platform-learning-empty { display: grid; place-items: center; gap: 6px; padding: 22px 12px; border: 0; background: #f8fafb; border-radius: 8px; }
.courseos-app .platform-parent-guide .platform-learning-empty > span { font-size: 28px; color: #98a8b3; }
.courseos-app .platform-parent-guide .platform-learning-empty p { color: #7d8d99; font-size: 13px; }
.courseos-app .platform-parent-guide .platform-learning-featured > div { display: flex; flex-wrap: wrap; gap: 12px; }
.courseos-app .platform-parent-guide .platform-learning-featured img { width: min(100%, 200px); height: 150px; object-fit: contain; border-radius: 8px; background: #f8fafb; }
.courseos-app .platform-parent-guide button:focus-visible { outline: 3px solid #28a49a; outline-offset: 3px; }
@media (max-width: 900px) {
  .courseos-app .platform-parent-guide .platform-guide-columns { grid-template-columns: minmax(0, 1fr); }
  .courseos-app .platform-parent-guide .platform-guide-aside { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .courseos-app .platform-parent-guide .platform-guide-hero { padding: 24px; }
}
@media (max-width: 600px) {
  .courseos-app .platform-parent-guide .platform-guide-hero { flex-direction: column; align-items: stretch; gap: 20px; padding: 20px; }
  .courseos-app .platform-parent-guide .platform-learning-actions { align-items: stretch; }
  .courseos-app .platform-parent-guide .platform-learning-actions > span { max-width: none; }
  .courseos-app .platform-parent-guide .platform-learning-pair,
  .courseos-app .platform-parent-guide .platform-guide-aside,
  .courseos-app .platform-parent-guide .platform-learning-intro { grid-template-columns: minmax(0, 1fr); }
  .courseos-app .platform-parent-guide section.platform-guide-card { padding: 18px; }
  .courseos-app .platform-parent-guide .platform-guide-meta { gap: 8px 12px; }
}
.courseos-app .platform-parent-guide section.platform-learning-homework { padding: 20px !important; border-bottom: 1px solid #f2e7d2 !important; }