.sidebar {
  background: var(--bg-sidebar);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  height: 100%;
}

.sidebar__header {
  padding: 12px 16px;
  padding-left: 78px; /* space for macOS traffic light buttons */
  border-bottom: 1px solid var(--border-primary);
  flex-shrink: 0;
  -webkit-app-region: drag;
  app-region: drag;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar__header h2 {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-heading);
  letter-spacing: -0.01em;
}

.sidebar__header button {
  -webkit-app-region: no-drag;
  app-region: no-drag;
}

.sidebar__theme-toggle {
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: 16px;
  padding: 4px 6px;
  border-radius: 6px;
  line-height: 1;
  transition: all 0.15s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sidebar__theme-toggle:hover {
  background: var(--bg-hover);
  color: var(--text-heading);
}

.sidebar__nav {
  padding: 8px 0;
  flex: 1;
  overflow-y: auto;
}

/* Filters */
.sidebar__filters {
  padding: 4px 0;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--border-primary);
}

.sidebar__filter-item {
  padding: 6px 16px;
  cursor: pointer;
  font-size: 13px;
  border-radius: 6px;
  margin: 1px 6px;
  transition: all 0.12s;
  color: var(--text-secondary);
}

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

.sidebar__filter-item--active {
  background: var(--accent-blue-bg);
  color: var(--accent-blue);
  font-weight: 500;
}

.sidebar__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  margin-left: 6px;
  border-radius: 9px;
  background: var(--accent-orange, #ff9800);
  color: #fff;
  font-size: 10px;
  font-weight: 600;
  line-height: 1;
}

/* Section Groups */
.sidebar__section {
  margin-bottom: 4px;
}

.sidebar__section-header {
  display: flex;
  align-items: center;
  padding: 6px 8px;
  margin: 0 4px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  user-select: none;
}

.sidebar__section-header:hover {
  background: var(--bg-button);
  color: var(--text-secondary);
}

.sidebar__section-header--active {
  background: var(--bg-button);
  color: var(--text-heading);
}

.sidebar__collapse-btn {
  background: none;
  border: none;
  color: inherit;
  font-size: 10px;
  cursor: pointer;
  padding: 0 4px 0 0;
  line-height: 1;
  width: 16px;
  flex-shrink: 0;
}

.sidebar__section-label {
  flex: 1;
}

.sidebar__section-count {
  font-size: 10px;
  color: var(--text-muted);
  margin-right: 4px;
}

.sidebar__add-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 14px;
  cursor: pointer;
  padding: 0 2px;
  line-height: 1;
  border-radius: 3px;
  opacity: 0;
  transition: opacity 0.15s;
}

.sidebar__section-header:hover .sidebar__add-btn {
  opacity: 1;
}

.sidebar__add-btn:hover {
  color: var(--text-heading);
  background: var(--bg-hover);
}

/* Section items (entity list) */
.sidebar__section-items {
  padding: 2px 0;
}

.sidebar__item {
  padding: 5px 16px 5px 28px;
  cursor: pointer;
  font-size: 13px;
  border-radius: 6px;
  margin: 1px 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-secondary);
  transition: all 0.12s;
}

.sidebar__item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.sidebar__item--active {
  background: var(--accent-blue-bg);
  color: var(--accent-blue);
  font-weight: 500;
}

/* Topics */
.sidebar__topics {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--border-primary);
}

.sidebar__topics-header {
  padding: 6px 16px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  user-select: none;
}

.sidebar__topic-item {
  padding: 5px 16px 5px 28px;
  cursor: pointer;
  font-size: 13px;
  border-radius: 6px;
  margin: 1px 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text-secondary);
  transition: all 0.12s;
}

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

.sidebar__topic-item--active {
  background: var(--accent-blue-bg);
  color: var(--accent-blue);
  font-weight: 500;
}

/* Commit button */
.sidebar__commit {
  padding: 10px 12px;
  border-top: 1px solid var(--border-primary);
  flex-shrink: 0;
}

.sidebar__commit-btn {
  width: 100%;
  padding: 7px 12px;
  font-size: 12px;
  font-weight: 500;
  border: none;
  border-radius: 6px;
  background: var(--accent-blue, #2196f3);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: opacity 0.15s;
}

.sidebar__commit-btn:hover {
  opacity: 0.9;
}

.sidebar__commit-btn .sidebar__badge {
  background: rgba(255, 255, 255, 0.25);
  color: #fff;
}