.app-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
}
.sidebar {
  background: var(--color-forest);
  color: var(--color-on-forest);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
.sidebar__brand {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-5);
  color: inherit;
  text-decoration: none;
}
.sidebar__logo { width: 2.2rem; height: 2.2rem; }
.sidebar__title { font-size: 1.15rem; }
.sidebar__subtitle { font-size: var(--text-xs); color: var(--color-on-forest-muted); }
.sidebar__nav { flex: 1; padding: var(--space-2) var(--space-2) var(--space-4); overflow: auto; display: flex; flex-direction: column; gap: 0.15rem; }
.sidebar__foot { padding: var(--space-4); font-size: var(--text-xs); color: var(--color-on-forest-muted); }
.nav-group { border: 0; }
.nav-group__summary {
  list-style: none;
  cursor: pointer;
  padding: 0.55rem 0.75rem 0.3rem;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-on-forest-muted);
  user-select: none;
}
.nav-group__summary::-webkit-details-marker { display: none; }
.nav-group__summary::before {
  content: '';
  display: inline-block;
  width: 0.35rem;
  height: 0.35rem;
  margin-right: 0.45rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(-45deg);
  vertical-align: 0.1rem;
}
.nav-group[open] > .nav-group__summary::before { transform: rotate(45deg); }
.nav-group__items { display: flex; flex-direction: column; padding: 0 0 0.35rem 0.35rem; }
.nav-link {
  display: block;
  color: inherit;
  text-decoration: none;
  padding: 0.4rem 0.75rem 0.4rem 1.15rem;
  border-radius: var(--radius);
  font-size: var(--text-sm);
}
.nav-link--home { padding-left: 0.75rem; margin-bottom: 0.25rem; font-weight: 600; }
.nav-link.is-active, .nav-link:hover { background: rgba(255,255,255,0.08); }
.main { display: flex; flex-direction: column; min-width: 0; }
.topbar {
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-4);
  border-bottom: 1px solid var(--color-line);
  background: var(--color-elev);
  position: sticky;
  top: 0;
  z-index: 5;
}
.topbar__title { flex: 1; font-size: var(--text-lg); margin: 0; }
.topbar__actions { display: flex; gap: var(--space-2); align-items: center; }
.content { flex: 1; }
.bottom-nav { display: none; }
#btn-menu { display: none; }

@media (max-width: 860px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(18rem, 86vw);
    transform: translateX(-105%);
    z-index: var(--z-sidebar);
    transition: transform 180ms ease;
  }
  .app-shell.nav-open .sidebar { transform: none; }
  #btn-menu { display: inline-flex; }
  .bottom-nav {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    position: fixed;
    left: 0; right: 0; bottom: 0;
    background: var(--color-elev);
    border-top: 1px solid var(--color-line);
    height: var(--bottom-nav);
    z-index: 15;
    align-items: center;
    text-align: center;
  }
  .bottom-nav a { color: var(--color-text); text-decoration: none; font-size: var(--text-xs); padding: var(--space-2); }
  .bottom-nav a.is-active { color: var(--color-teal); font-weight: 600; }
  .bottom-nav__add {
    width: 2.75rem; height: 2.75rem; margin: 0 auto;
    border-radius: 50%; background: var(--color-teal); color: #fff !important;
    font-size: 1.5rem; line-height: 2.75rem; padding: 0 !important;
  }
  .picoscan-fab { bottom: calc(var(--bottom-nav) + 1rem) !important; }
  .hide-sm { display: none; }
  .show-sm { display: inline; }
  .page-head { flex-wrap: wrap; align-items: flex-start; }
}