.app-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  background: var(--bg-sidebar);
  color: var(--text-inverse);
  padding: var(--space-6);
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: var(--space-6);
  border-right: 1px solid rgba(255,255,255,0.08);
}

.sidebar-brand {
  display: flex;
  gap: var(--space-4);
  align-items: center;
}

.sidebar-logo {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--brand), #38bdf8);
  display: grid;
  place-items: center;
  font-weight: 800;
  color: white;
}

.sidebar-nav,
.sidebar-footer {
  display: grid;
  gap: var(--space-2);
}

.main-shell {
  display: grid;
  grid-template-rows: auto 1fr;
  min-width: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--border-color);
  background: color-mix(in srgb, var(--bg-app) 84%, transparent);
  backdrop-filter: blur(18px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.topbar-left,
.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.page-body {
  padding: var(--space-6);
  display: grid;
  gap: var(--space-6);
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.page-grid {
  display: grid;
  gap: var(--space-6);
}

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

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (max-width: 1180px) {
  .app-shell { grid-template-columns: 96px minmax(0, 1fr); }
  .sidebar-brand-text,
  .nav-text,
  .sidebar-footer .btn-text { display: none; }
}

@media (max-width: 920px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { position: sticky; top: 0; z-index: 30; grid-template-rows: auto auto auto; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}