.app-shell {
  display: grid;
  grid-template-columns: 250px 1fr;
  min-height: 100vh;
}

.sidebar {
  border-right: 1px solid var(--border);
  background: var(--surface);
  padding: var(--space-6) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.sidebar__group {
  display: grid;
  gap: var(--space-2);
}

.sidebar__link {
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  color: var(--muted);
  font-weight: 500;
  transition: background 180ms ease, color 180ms ease;
}

.sidebar__link:hover,
.sidebar__link.is-active {
  background: var(--primary-soft);
  color: var(--primary);
}

.sidebar__link.is-disabled {
  opacity: 0.5;
  pointer-events: none;
}

.menu-toggle {
  display: none;
}

.overlay {
  display: none;
}

.main-content {
  min-width: 0;
}

@media (max-width: 1024px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    left: -280px;
    top: 0;
    bottom: 0;
    width: 260px;
    z-index: 60;
    transition: left 220ms ease;
  }

  .sidebar.is-open { left: 0; }

  .menu-toggle {
    display: inline-flex;
    border: 1px solid var(--border);
    padding: 8px;
    background: var(--surface);
    border-radius: var(--radius-sm);
    cursor: pointer;
  }

  .overlay {
    position: fixed;
    inset: 0;
    background: rgba(12, 19, 31, 0.45);
    z-index: 55;
  }

  .overlay.is-visible { display: block; }
}