.sidebar {
  position: fixed;
  top: 0;
  left: -280px;
  width: 280px;
  max-width: calc(100vw - 24px);
  height: 100dvh;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  z-index: 1000;
  transition: left 0.25s ease;
  display: flex;
  flex-direction: column;
}

.sidebar.open {
  left: 0;
}

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  z-index: 999;
}

.sidebar-backdrop.visible,
.sidebar-backdrop.show {
  opacity: 1;
  pointer-events: auto;
  display: block;
}

.sidebar-header {
  padding: 14px 12px 10px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sidebar-close {
  align-self: flex-end;
  min-height: 44px;
  min-width: 44px;
  font-size: 18px;
  color: var(--text-secondary);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 700;
  padding: 0 6px;
}

.new-chat-btn {
  width: 100%;
  min-height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 10px;
}

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

.conversation-search-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.conversation-search-wrap i {
  position: absolute;
  left: 12px;
  font-size: 13px;
  color: var(--text-secondary);
  pointer-events: none;
}

.conversation-search {
  width: 100%;
  min-height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-main);
  color: var(--text-primary);
  padding: 0 12px 0 34px;
  font: inherit;
  font-size: 14px;
}

.conversation-search::placeholder {
  color: var(--text-secondary);
}

.conversation-search:focus {
  outline: none;
  border-color: var(--claude-orange);
}

.conversation-groups {
  flex: 1;
  overflow-y: auto;
  padding: 8px 8px 10px;
}

.history-label {
  font-size: 12px;
  color: var(--text-secondary);
  margin: 12px 8px 8px;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 44px;
  padding: 2px 4px 2px 0;
  border-radius: 10px;
  color: var(--text-primary);
  width: 100%;
  border-left: 2px solid transparent;
}

.history-main-btn {
  flex: 1;
  min-width: 0;
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 8px;
  border-radius: 10px;
  text-align: left;
  color: inherit;
}

.history-icon {
  flex-shrink: 0;
  width: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: 13px;
}

.history-item .history-title {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 100%;
}

.history-item .dots {
  margin-left: auto;
  color: var(--text-secondary);
  opacity: 0;
}

.history-item:hover,
.history-item:focus-within {
  background: var(--hover-bg);
}

.history-item:hover .dots,
.history-item:hover .item-actions,
.history-item:focus-within .item-actions {
  opacity: 1;
}

.history-item.active {
  background: var(--sidebar-active);
  border-left-color: var(--claude-orange);
}

.sidebar-footer {
  border-top: 1px solid var(--border);
  padding: 8px 8px 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-user-row,
.footer-icon-row,
.theme-toggle {
  width: 100%;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px;
}

.footer-icon-row,
.theme-toggle {
  justify-content: flex-start;
  gap: 8px;
}

.footer-user-row:hover,
.footer-icon-row:hover,
.theme-toggle:hover {
  background: var(--hover-bg);
}

.sidebar-signature {
  margin-top: 8px;
  border-top: 0.5px solid var(--border);
  padding: 12px 16px;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.sidebar-signature:hover {
  color: var(--text-primary);
}

.signature-main {
  margin: 0;
  font-size: 11px;
}

.signature-sub {
  margin: 3px 0 0;
  font-size: 10px;
}

.signature-link {
  color: inherit;
  text-decoration: none;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 8px;
}

.avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--btn-primary);
  color: var(--btn-text);
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 600;
}

@media (min-width: 768px) {
  .sidebar {
    width: 300px;
  }
}

@media (min-width: 1024px) {
  .sidebar {
    position: relative;
    left: 0;
    width: 260px;
    max-width: 260px;
    transition: none;
    height: 100dvh;
  }

  .sidebar-close {
    display: none;
  }

  .sidebar-backdrop {
    display: none;
  }
}