.app-shell {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.app-body {
  display: flex;
  flex: 1;
  min-height: 0;
}

.sidebar {
  flex-shrink: 0;
  width: var(--sidebar-width);
  background: var(--color-bg-sidebar);
  border-right: 0.1rem solid var(--color-border);
  display: flex;
  flex-direction: column;
  padding: var(--spacing-md) 0;
}

.content {
  flex: 1;
  padding: var(--spacing-lg);
  overflow-y: auto;
}

.content__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(30rem, 1fr));
  gap: var(--spacing-md);
}

.content__empty {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--color-text-muted);
  font-size: var(--font-size-md);
}

@media (max-width: 900px) {
  .app-body {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 0.1rem solid var(--color-border);
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .sidebar__profile,
  .sidebar__divider,
  .sidebar__footer {
    display: none;
  }

  .sidebar__nav {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .sidebar__tags {
    width: 100%;
  }

  .content__grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .content {
    padding: var(--spacing-md);
  }
}