/* App shell: topbar + collapsible desktop sidebar + mobile bottom nav.
   Depends on tokens.css. */

.app-topbar {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  height: var(--topbar-h);
  padding: 0 var(--space-4);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.app-topbar .brand {
  font-weight: 700;
  font-size: var(--fs-lg);
  color: var(--text);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.app-topbar .topbar-search { flex: 1; max-width: 420px; display: none; }
.app-topbar .topbar-spacer { flex: 1; }
.app-topbar .topbar-actions { display: flex; align-items: center; gap: var(--space-2); flex-shrink: 0; }

.sidebar-toggle-btn { display: none; }

.account-menu { position: relative; }
.account-menu-panel {
  position: absolute;
  inset-inline-end: 0;
  top: calc(100% + 0.4rem);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  min-width: 200px;
  padding: var(--space-2);
  z-index: var(--z-drawer);
}
.account-menu-panel[hidden] { display: none; }
.account-menu-panel .menu-item {
  display: block; width: 100%; text-align: start; background: none; border: none;
  padding: 0.55rem 0.7rem; border-radius: var(--radius-sm); font-size: var(--fs-sm);
  color: var(--text); cursor: pointer; min-height: var(--tap-min);
}
.account-menu-panel .menu-item:hover { background: var(--surface-2); }
.account-menu-panel .menu-item.danger { color: var(--danger); }
.account-menu-panel form { margin: 0; }
.account-menu-panel .locale-row { padding: 0.4rem 0.5rem; }
.account-menu-panel select { width: 100%; }

.app-shell-v2 { display: flex; min-height: calc(100vh - var(--topbar-h)); }

.app-sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  padding: var(--space-4) var(--space-2);
  border-inline-end: 1px solid var(--border);
  display: none; /* shown from 1024px up */
  flex-direction: column;
  gap: 0.15rem;
  position: sticky;
  top: var(--topbar-h);
  align-self: flex-start;
  height: calc(100vh - var(--topbar-h));
  overflow-y: auto;
  background: var(--surface);
  transition: width 0.15s ease;
}
.app-sidebar a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: var(--fs-sm);
  min-height: var(--tap-min);
  white-space: nowrap;
  overflow: hidden;
}
.app-sidebar a .icon { width: 20px; text-align: center; flex-shrink: 0; }
.app-sidebar a:hover, .app-sidebar a[aria-current="page"] { background: var(--surface-2); text-decoration: none; }
.app-sidebar a[aria-current="page"] { color: var(--accent); font-weight: 600; }
.app-sidebar .sidebar-collapse-row { margin-top: auto; padding-top: var(--space-3); border-top: 1px solid var(--border); }

.app-sidebar.collapsed { width: var(--sidebar-w-collapsed); }
.app-sidebar.collapsed a .label { display: none; }
.app-sidebar.collapsed a { justify-content: center; }

main.content {
  flex: 1;
  min-width: 0;
  padding: var(--space-5) var(--space-4) calc(var(--space-6) + var(--bottom-nav-h));
  max-width: var(--content-max);
  margin: 0 auto;
  width: 100%;
}

/* ---------- Mobile bottom nav ---------- */
.bottom-nav {
  position: fixed;
  inset-inline: 0;
  bottom: 0;
  z-index: var(--z-sticky);
  display: flex;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
.bottom-nav a, .bottom-nav button {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
  min-height: var(--bottom-nav-h);
  color: var(--text-muted);
  font-size: var(--fs-xs);
  background: none;
  border: none;
  font-family: inherit;
  cursor: pointer;
}
.bottom-nav .icon { font-size: 1.25rem; line-height: 1; }
.bottom-nav a[aria-current="page"], .bottom-nav a:hover, .bottom-nav button:hover { color: var(--accent); text-decoration: none; }

@media (min-width: 768px) {
  .app-topbar .topbar-search { display: block; }
  .app-sidebar { display: flex; }
}

/* Tablet: sidebar is icon-only regardless of the collapse toggle (which is
   a desktop-only affordance, per plan section 4's simpler tablet layout). */
@media (min-width: 768px) and (max-width: 1023px) {
  .app-sidebar { width: var(--sidebar-w-collapsed); }
  .app-sidebar a { justify-content: center; }
  .app-sidebar a .label { display: none; }
}

@media (min-width: 1024px) {
  main.content { padding-inline: var(--space-6); }
  .sidebar-toggle-btn { display: inline-flex; }
}

@media (max-width: 767px) {
  main.content { padding-bottom: calc(var(--bottom-nav-h) + env(safe-area-inset-bottom, 0px) + var(--space-5)); }
}

@media (min-width: 768px) {
  .bottom-nav { display: none; }
}