/* Shared application shell. Content templates keep their own layouts. */
body:has(.app-nav) { --nav-width: 224px; padding-left: var(--nav-width); }
html[data-nav-compact] body:has(.app-nav), body.live-editor-page:has(.app-nav) { --nav-width: 72px; }
html[data-nav-expanded] body.live-editor-page:has(.app-nav) { --nav-width: 224px; }
.app-nav { position: fixed; inset: 0 auto 0 0; z-index: 60; width: var(--nav-width); padding: 12px; display: flex; flex-direction: column; background: var(--paper); border-right: 1px solid var(--line); }
.app-nav svg, .app-nav-toggle svg { width: 20px; height: 20px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.app-nav__brand { display: flex; align-items: center; justify-content: space-between; min-height: 64px; padding-left: 12px; }
.app-nav-toggle { display: inline-grid; place-items: center; width: 44px; height: 44px; flex: 0 0 44px; border: 0; border-radius: 7px; background: transparent; color: var(--muted); cursor: pointer; }
.app-nav__links { display: grid; gap: 4px; margin-top: 26px; overflow-y: auto; min-height: 0; }
.app-nav__link, .app-nav .theme-toggle { position: relative; display: flex; align-items: center; gap: 12px; width: 100%; min-height: 44px; height: auto; padding: 10px 12px; border: 0; border-radius: 6px; background: transparent; color: var(--muted); text-decoration: none; text-align: left; font-size: 14px; font-weight: 400; white-space: nowrap; cursor: pointer; }
.app-nav__link:hover, .app-nav .theme-toggle:hover, .app-nav-toggle:hover { background: var(--surface-soft); color: var(--ink); }
.app-nav__link[aria-current] { background: var(--surface); color: var(--ink); font-weight: 600; }
.app-nav__link[aria-current]::before { content: ''; position: absolute; left: 0; top: 13px; bottom: 13px; width: 2px; border-radius: 2px; background: var(--attempt-accepted, var(--green)); }
.app-nav__bottom { margin-top: auto; padding-top: 24px; }
.app-nav__user { display: flex; align-items: center; gap: 12px; border-top: 1px solid var(--line); padding: 20px 12px 13px; color: var(--muted); overflow: hidden; }
.app-nav__user strong, .app-nav__user small { display: block; }
.app-nav__user strong { color: var(--ink); font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.app-nav__user small { font-size: 11px; margin-top: 2px; }
.app-nav__bottom form { margin: 0; }
.live-rooms__list[data-live-room-directory]:not(:has([data-room-id]))::after { content: 'Активных учеников пока нет.'; color: var(--muted); }
.live-room-link.is-online [data-room-status] { color: var(--attempt-accepted, var(--green)); }
.theme-toggle__label { display: none; }
.app-nav .theme-toggle__label { display: inline; }
.app-mobile-bar, .app-nav-backdrop { display: none; }
.app-nav-toggle__chevron { transform-origin: 15px 12px; }
html[data-nav-compact] .app-nav__label, .live-editor-page .app-nav__label { display: none; }
html[data-nav-expanded] .live-editor-page .app-nav__label { display: inline; }
/* Keep identity geometry stable while the outer rail changes width. */
.app-nav .app-nav__user .app-nav__label,
html[data-nav-compact] .app-nav .app-nav__user .app-nav__label,
html[data-nav-expanded] .app-nav .app-nav__user .app-nav__label { display: block; flex: 0 0 144px; width: 144px; white-space: nowrap; }
@media (min-width: 761px) {
  html[data-nav-compact] .app-nav__user .app-nav__label,
  .live-editor-page .app-nav__user .app-nav__label { opacity: 0; visibility: hidden; }
  html[data-nav-expanded] .app-nav__user .app-nav__label { opacity: 1; visibility: visible; }
}
html[data-nav-compact] .app-nav__brand, .live-editor-page .app-nav__brand { padding-left: 0; justify-content: center; }
html[data-nav-expanded] .live-editor-page .app-nav__brand { padding-left: 12px; justify-content: space-between; }
html[data-nav-compact] .app-nav-toggle__chevron, .live-editor-page .app-nav-toggle__chevron { transform: rotate(180deg); }
html[data-nav-expanded] .live-editor-page .app-nav-toggle__chevron { transform: none; }
body.live-editor-page:has(.app-nav) { display: block; }
.live-editor-page:has(.app-nav) .live-shell { height: 100dvh; }
.live-editor-page:has(.app-nav) .live-toolbar { grid-template-columns: minmax(0,1fr) auto; }
@media (max-width: 760px) {
  body:has(.app-nav), html[data-nav-compact] body:has(.app-nav) { padding-left: 0; }
  .app-nav { position: static; width: 100%; border-right: 0; border-bottom: 1px solid var(--line); }
  html[data-nav-ready] .app-nav { position: fixed; inset: 0 auto 0 0; width: 224px; border-right: 1px solid var(--line); transform: translateX(-100%); visibility: hidden; }
  html[data-nav-open] .app-nav { transform: none; visibility: visible; }
  html[data-nav-ready] .app-mobile-bar { display: flex; align-items: center; gap: 12px; height: 56px; padding: 0 12px; border-bottom: 1px solid var(--line); }
  html[data-nav-ready] .app-nav-backdrop { display: block; position: fixed; inset: 0; z-index: 59; background: #0007; border: 0; opacity: 0; visibility: hidden; }
  html[data-nav-open] .app-nav-backdrop { opacity: 1; visibility: visible; }
  html[data-nav-open] body { overflow: hidden; }
  html[data-nav-compact] .app-nav__label, .live-editor-page .app-nav__label { display: inline; }
  html[data-nav-compact] .app-nav__brand, .live-editor-page .app-nav__brand { padding-left: 12px; justify-content: space-between; }
  .app-nav-toggle__chevron { transform: none !important; }
  html[data-nav-open] .app-nav-toggle__chevron { transform: rotate(180deg) !important; }
  .live-editor-page:has(.app-nav) .live-shell { height: calc(100dvh - 56px); }
}
@media (prefers-reduced-motion: no-preference) {
  /* Match the dashboard entrance once per document, not on live updates.
     No forwards fill: fixed dialogs must stay relative to the viewport. */
  .wiki-page, .admin-submissions-page, .live-shell {
    animation: reveal 360ms ease-out backwards;
  }
  /* Width is intentional here: the editor must reflow, never scale its text. */
  @media (min-width: 761px) {
    .app-nav__user .app-nav__label { transition: opacity 120ms ease; }
    html[data-nav-animate] .app-nav { transition: width 220ms cubic-bezier(.32,.72,0,1); }
    html[data-nav-animate] body:has(.app-nav) { transition: padding-left 220ms cubic-bezier(.32,.72,0,1); }
  }
  .app-nav-toggle__chevron { transition: transform 160ms ease; }
  .app-nav-toggle:active { transform: scale(.96); }
  @media (max-width: 760px) {
    html[data-nav-ready] .app-nav { transition: transform 220ms cubic-bezier(.32,.72,0,1), visibility 220ms; }
    html[data-nav-ready] .app-nav-backdrop { transition: opacity 180ms ease, visibility 220ms; }
  }
  ::view-transition-old(root) { animation: theme-fade-out 180ms ease both; }
  ::view-transition-new(root) { animation: theme-fade-in 180ms ease both; }
  @keyframes theme-fade-out { to { opacity: 0; } }
  @keyframes theme-fade-in { from { opacity: 0; } }
}
@media (prefers-reduced-motion: reduce) {
  ::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*) { animation: none !important; }
}