.app {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  z-index: var(--z-sidebar);
  transition: transform var(--transition-normal);
}

.sidebar.collapsed {
  transform: translateX(calc(-1 * var(--sidebar-width)));
  position: absolute;
  height: 100%;
}

.sidebar-header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  padding: 0 16px;
  border-bottom: 1px solid var(--border-color);
  gap: 12px;
}

.sidebar-header .app-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.sidebar-nav .nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.sidebar-nav .nav-item:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
}

.sidebar-nav .nav-item.active {
  background: var(--accent-dim);
  color: var(--accent);
}

.sidebar-nav .nav-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.sidebar-section-title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 16px 12px 6px;
}

/* Recent folders */
.recent-folders-list {
  padding: 0 0 4px;
}

.recent-folder-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.recent-folder-remove {
  opacity: 0;
  color: var(--text-muted);
  transition: opacity var(--transition-fast), color var(--transition-fast);
  padding: 2px;
  flex-shrink: 0;
}

.recent-folder-item:hover .recent-folder-remove {
  opacity: 1;
}

.recent-folder-remove:hover {
  color: var(--text-primary);
}

/* Main content */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  position: relative;
}

.main-header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  padding: 0 16px;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
  gap: 12px;
  z-index: var(--z-header);
}

.main-header .breadcrumb {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.main-header .breadcrumb span {
  color: var(--text-primary);
}

.main-content {
  flex: 1;
  overflow: auto;
  position: relative;
}

/* Toggle sidebar button */
.btn-toggle-sidebar {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.btn-toggle-sidebar:hover {
  background: var(--bg-surface-hover);
}

/* View sections */
.view {
  display: none;
  height: 100%;
}

.view.active {
  display: flex;
  flex-direction: column;
}