.sidebar {
  flex: 0 0 260px;
  width: 260px;
  height: 100svh;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border);
  background: var(--bg);
  box-sizing: border-box;
  padding: 16px 12px;
  gap: 16px;
  overflow: hidden;
  transition: flex-basis 0.25s ease, width 0.25s ease, padding 0.25s ease;
}

.collapsed {
  flex-basis: 64px;
  width: 64px;
  padding: 16px 8px;
}

.top {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.toggle {
  align-self: flex-end;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text-h);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s;

  &:hover {
    background: var(--accent-bg);
  }
}

.collapsed .toggle {
  align-self: center;
}

.chevron {
  display: inline-block;
  transition: transform 0.25s ease;
}

.chevronRight {
  transform: rotate(180deg);
}

.newChat {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #111;
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity 0.2s, transform 0.1s;

  &:hover:not(:disabled) {
    opacity: 0.85;
  }

  &:active:not(:disabled) {
    transform: scale(0.98);
  }

  &:disabled {
    opacity: 0.5;
    cursor: not-allowed;
  }
}

.collapsed .newChat {
  justify-content: center;
  padding: 10px 0;
  width: 100%;
}

.newChatIcon {
  font-size: 18px;
  line-height: 1;
}

.newChatLabel {
  overflow: hidden;
  max-width: 120px;
  opacity: 1;
  transition: max-width 0.25s ease, opacity 0.2s ease;
}

.collapsed .newChatLabel {
  max-width: 0;
  opacity: 0;
}

.threadList {
  flex: 1 1 auto;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.empty {
  color: var(--text);
  font-size: 13px;
  text-align: center;
  margin-top: 24px;
}

.threadItem {
  display: flex;
  align-items: center;
  border-radius: 10px;
  background: transparent;
  color: var(--text-h);
  font-size: 14px;
  white-space: nowrap;
  transition: background 0.2s;

  &:hover {
    background: var(--accent-bg);
  }
}

.threadButton {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border: none;
  border-radius: 10px;
  background: transparent;
  color: inherit;
  font-size: inherit;
  text-align: left;
  cursor: pointer;
  white-space: nowrap;
  min-width: 0;

  &:disabled {
    opacity: 0.5;
    cursor: not-allowed;
  }
}

.collapsed .threadButton {
  justify-content: center;
  padding: 10px 0;
}

.deleteThread {
  flex: 0 0 auto;
  margin-right: 6px;
  padding: 4px 6px;
  border: none;
  border-radius: 6px;
  background: transparent;
  font-size: 13px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.2s, background 0.2s;

  .threadItem:hover &,
  &:focus-visible {
    opacity: 1;
  }

  &:hover:not(:disabled) {
    background: rgba(255, 60, 60, 0.15);
  }

  &:disabled {
    cursor: not-allowed;
  }
}

.active {
  background: var(--accent-bg);
  font-weight: 600;
}

.threadIcon {
  flex: 0 0 auto;
  font-size: 14px;
}

.threadLabel {
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 180px;
  opacity: 1;
  transition: max-width 0.25s ease, opacity 0.2s ease;
}

.collapsed .threadLabel {
  max-width: 0;
  opacity: 0;
}