#sidebar {
  width: 190px;
  background-color: var(--sidebar-bg);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
  flex-shrink: 0;
  padding: 0.5rem;
}

#sidebar.collapsed {
  display: none;
}

.new-chat-btn {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  width: 100%;
  padding: 0.5rem;
  background-color: transparent;
  border: none;
  border-radius: 0.5rem;
  color: var(--text-color);
  cursor: pointer;
  transition: background-color 0.2s;
  font-size: 0.8rem;
}

.new-chat-btn:hover {
  background-color: var(--hover-color);
}

#chat-history {
  flex-grow: 1;
  overflow-y: auto;
  padding-top: 1rem;
}

.history-item {
  padding: 0.5rem;
  border-radius: 0.5rem;
  cursor: pointer;
  color: var(--muted-text-color);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background-color 0.2s;
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.history-item:hover {
  background-color: var(--hover-color);
  color: var(--text-color);
}

.history-item.active {
  background-color: var(--hover-color);
  color: var(--text-color);
}

.user-menu-btn {
  position: relative;
  margin-top: auto;
  padding: 0.75rem;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-color);
  width: 100%;
  transition: background-color 0.2s;
}

.user-menu-btn:hover {
  background-color: var(--hover-color);
}

.avatar-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
  min-width: 0;
}

.avatar-circle {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--primary-color);
  color: black;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  flex-shrink: 0;
}

.user-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
  flex: 1;
}

.user-name {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-color);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  height: 0.9rem;
  line-height: 0.9rem;
}

.user-email {
  font-size: 0.75rem;
  color: var(--muted-text-color);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  height: 0.75rem;
  line-height: 0.75rem;
}

@keyframes skeleton-loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

.user-info.loading .user-name {
  background: linear-gradient(90deg, var(--border-color) 25%, var(--hover-color) 50%, var(--border-color) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: 4px;
  color: transparent;
  margin-bottom: 0.35rem;
  max-width: 85%;
}

.user-info.loading .user-email {
  background: linear-gradient(90deg, var(--border-color) 25%, var(--hover-color) 50%, var(--border-color) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: 4px;
  color: transparent;
  max-width: 70%;
}

.user-menu {
  position: absolute;
  bottom: 64px;
  left: 8px;
  background-color: var(--sidebar-bg);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  margin-bottom: 0.5rem;
  z-index: 100;
  overflow: hidden;
  width: 200px;
}

.user-menu.hidden {
  display: none;
}

.menu-item {
  width: 100%;
  padding: 0.25rem 0.5rem;
  background: transparent;
  border: none;
  color: var(--text-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.8rem;
  transition: background-color 0.2s;
  border-radius: 4px;
}

.menu-item:hover {
  background-color: var(--hover-color);
}

.menu-item svg {
  flex-shrink: 0;
}