/* AirContent Update Repository — application shell (top bar, sidebar, content) */

.shell { display: grid; grid-template-rows: var(--ac-topbar-height) 1fr; min-height: 100vh; }

.topbar {
  display: flex; align-items: center; gap: 12px; padding: 0 16px;
  background: var(--ac-topbar-bg); color: var(--ac-topbar-fg);
  position: sticky; top: 0; z-index: 50;
}
.topbar .brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 15px; color: inherit; text-decoration: none; }
.topbar .brand img { width: 28px; height: 28px; }
.topbar .brand small { font-weight: 400; opacity: 0.85; font-size: 12px; margin-left: 4px; }
.topbar .spacer { flex: 1 1 auto; }
.topbar .topbar-btn { display: inline-flex; align-items: center; gap: 6px; height: 32px; padding: 0 10px; border: 0; border-radius: 3px; background: transparent; color: inherit; }
.topbar .topbar-btn > span { max-width: 220px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.topbar .topbar-btn:hover { background: var(--ac-topbar-hover); }
.topbar .topbar-btn.open { background: var(--ac-topbar-open); }
.topbar .menu-toggle { display: none; }
.topbar .user-chip { font-size: var(--ac-font-size-sm); opacity: 0.9; }

.shell-body { display: grid; grid-template-columns: var(--ac-sidebar-width) 1fr; min-height: 0; }

.sidebar {
  background: var(--ac-sidebar-bg); border-right: 1px solid var(--ac-brush-minor);
  padding: 14px 10px; display: flex; flex-direction: column; gap: 2px;
  position: sticky; top: var(--ac-topbar-height); height: calc(100vh - var(--ac-topbar-height)); overflow: auto;
}
.sidebar .nav-section { color: var(--ac-brush-light); font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; padding: 10px 10px 4px; }
.sidebar a.nav-item { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 4px; color: var(--ac-sidebar-fg); text-decoration: none; }
.sidebar a.nav-item:hover { background: var(--ac-sidebar-hover); }
.sidebar a.nav-item.active { background: var(--ac-sidebar-active-bg); color: var(--ac-sidebar-active-fg); }
.sidebar a.nav-item .ac-icon { width: 18px; height: 18px; opacity: 0.9; }
.sidebar .sidebar-footer { margin-top: auto; padding: 10px; color: var(--ac-brush-light); font-size: 11px; }

.content { padding: 22px 24px 40px; min-width: 0; }
.content-inner { max-width: var(--ac-content-max); margin: 0 auto; }
.page-header { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.page-header h1 { margin: 0; }
.page-header > div { min-width: 0; }
.page-header .page-sub { color: var(--ac-brush-light); margin-top: 2px; overflow-wrap: anywhere; }
.page-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.section { margin-bottom: 24px; }
.section > h2 { margin-bottom: 10px; }

.user-menu { position: absolute; right: 16px; top: calc(var(--ac-topbar-height) + 4px); background: var(--ac-menu-bg); color: var(--ac-brush); border: 1px solid var(--ac-brush-minor); border-radius: 4px; box-shadow: var(--ac-menu-shadow); min-width: 220px; padding: 6px 0; z-index: 60; }
.user-menu .um-head { padding: 8px 14px 10px; border-bottom: 1px solid var(--ac-brush-minor); }
.user-menu .um-head strong { display: block; }
.user-menu .um-head span { color: var(--ac-brush-light); font-size: var(--ac-font-size-sm); }
.user-menu button { display: flex; width: 100%; align-items: center; gap: 10px; padding: 8px 14px; border: 0; background: transparent; color: inherit; text-align: left; }
.user-menu button:hover { background: var(--ac-menu-hover); }
.user-menu .um-sep { border-top: 1px solid var(--ac-brush-minor); margin: 4px 0; }

@media (max-width: 900px) {
  .shell-body { grid-template-columns: 1fr; }
  .sidebar { position: fixed; left: 0; top: var(--ac-topbar-height); width: min(280px, 85vw); height: calc(100vh - var(--ac-topbar-height)); transform: translateX(-100%); transition: transform 160ms ease-out; z-index: 55; box-shadow: var(--ac-menu-shadow); }
  .sidebar.open { transform: none; }
  .sidebar-backdrop { position: fixed; inset: var(--ac-topbar-height) 0 0 0; background: var(--ac-overlay); z-index: 54; }
  .topbar .menu-toggle { display: inline-flex; }
  .topbar .user-chip { display: none; }
  .content { padding: 16px 16px 40px; }
}
@media (max-width: 600px) {
  .topbar { padding: 0 8px; gap: 6px; }
  .topbar .brand small { display: none; }
  .topbar .topbar-btn > span { display: none; }
}