/* ============================ 侧边栏 ============================ */
.sidebar {
    width: var(--sidebar-width);
    background: var(--color-sidebar-bg);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: width var(--duration-base) var(--ease),
        border-right-color var(--duration-base) var(--ease);
}
/* 桌面端折叠态:侧边栏宽度归零、隐藏边框,内容随之裁剪 */
body.sidebar-collapsed .sidebar {
    width: 0;
    border-right-color: transparent;
    overflow: hidden;
}
.sidebar-header {
    padding: 12px;
}

/* 侧边栏顶部图标按钮工具栏(收起 + 新建对话)。豆包式 */
.sidebar-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}
.sidebar-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1.1rem;
    transition: background var(--duration-fast) var(--ease),
        color var(--duration-fast) var(--ease);
}
.sidebar-icon-btn:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
}
.new-chat-btn {
    width: 100%;
    background: var(--color-surface);
    border: 1px solid var(--color-border-strong);
    color: var(--color-text);
    padding: 10px 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.92rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: background var(--duration-fast) var(--ease),
        border-color var(--duration-fast) var(--ease);
}
.new-chat-btn:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-text-tertiary);
}
.new-chat-btn i,
.new-chat-btn .lucide {
    font-size: 1.05rem;
}

/* B6 会话搜索框 */
.conv-search-wrap {
    margin-top: 8px;
}
.conv-search {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text);
    font-size: 0.85rem;
    outline: none;
    transition: border-color var(--duration-fast) var(--ease);
}
.conv-search:focus {
    border-color: var(--color-primary);
}
.conv-search::placeholder {
    color: var(--color-text-tertiary);
}

.conversation-list {
    flex: 1;
    overflow-y: auto;
    padding: 4px 8px 12px;
}
.conversation-item {
    position: relative;
    padding: 9px 32px 9px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    margin-bottom: 2px;
    display: flex;
    align-items: center;
    gap: 9px;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    transition: background var(--duration-fast) var(--ease),
        color var(--duration-fast) var(--ease);
}
.conversation-item > i:first-child,
.conversation-item > .lucide:first-child {
    font-size: 1rem;
    color: var(--color-text-tertiary);
}
.conversation-item:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
}
.conversation-item.active {
    background: var(--color-primary-soft);
    color: var(--color-text);
}
.conversation-item.active > i:first-child,
.conversation-item.active > .lucide:first-child {
    color: var(--color-primary);
}
.conv-title {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
/* D2 会话标签徽章 */
.conv-tag {
    flex-shrink: 0;
    max-width: 72px;
    padding: 1px 6px;
    border-radius: var(--radius-pill);
    background: var(--color-primary-soft);
    color: var(--color-primary);
    font-size: 0.68rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.conversation-item .pinned-icon {
    color: var(--color-primary);
    font-size: 0.75rem;
    display: none;
}
.conversation-item.pinned .pinned-icon {
    display: inline-flex;
}
.conversation-item .more-actions {
    position: absolute;
    right: 6px;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0;
    color: var(--color-text-tertiary);
    padding: 4px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    transition: opacity var(--duration-fast) var(--ease),
        background var(--duration-fast) var(--ease);
}
.conversation-item:hover .more-actions,
.conversation-item.active .more-actions {
    opacity: 1;
}
.conversation-item .more-actions:hover {
    background: var(--color-border-strong);
    color: var(--color-text);
}

/* 多会话并发状态指示:右侧 loading 圆环 / 未读蓝点。
   默认隐藏,由 .is-streaming / .is-unread 控制可见;
   hover 或选中态下让位给 .more-actions,避免视觉拥挤。 */
.conversation-item .conv-loading,
.conversation-item .conv-unread {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    display: none;
    pointer-events: none;
}
.conversation-item.is-streaming .conv-loading {
    display: inline-flex;
    width: 14px;
    height: 14px;
    border: 2px solid var(--color-border-strong);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: conv-spin 0.9s linear infinite;
    box-sizing: border-box;
}
/* 未读小蓝点 —— 仅当不在流式中且有未读时显示 */
.conversation-item.is-unread:not(.is-streaming) .conv-unread {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-primary);
}
/* hover / active 时优先显示更多操作按钮,状态指示让位 */
.conversation-item:hover .conv-loading,
.conversation-item:hover .conv-unread,
.conversation-item.active .conv-loading,
.conversation-item.active .conv-unread {
    display: none;
}
@keyframes conv-spin {
    to { transform: translateY(-50%) rotate(360deg); }
}
@media (prefers-reduced-motion: reduce) {
    .conversation-item.is-streaming .conv-loading {
        animation: none;
    }
}

/* ===== 站点入口固定导航区(ChatGPT 式,新建对话下方)===== */
.sidebar-nav {
    padding: 4px 8px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 4px;
}
.sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: 9px;
    padding: 9px 12px;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background var(--duration-fast) var(--ease),
        color var(--duration-fast) var(--ease);
}
.sidebar-nav-item:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
}
.sidebar-nav-item > i:first-child,
.sidebar-nav-item > .lucide:first-child {
    font-size: 1rem;
    color: var(--color-text-tertiary);
}
.sidebar-nav-item .nav-label {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.sidebar-nav-item .nav-ext-icon {
    font-size: 0.8rem;
    color: var(--color-text-tertiary);
    opacity: 0;
    transition: opacity var(--duration-fast) var(--ease);
}
.sidebar-nav-item:hover .nav-ext-icon {
    opacity: 1;
}

/* ===== 「最近」分组标题 ===== */
.conv-group-label {
    padding: 6px 16px 2px;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--color-text-tertiary);
}

/* ===== 底部用户卡片 + 向上弹出菜单 ===== */
.sidebar-footer {
    position: relative;
    padding: 8px;
    border-top: 1px solid var(--color-border);
    flex-shrink: 0;
}
.user-card {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    min-height: 44px;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    text-align: left;
    transition: background var(--duration-fast) var(--ease);
}
.user-card:hover {
    background: var(--color-surface-hover);
}
.user-avatar {
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary-soft);
    color: var(--color-primary);
    font-size: 0.82rem;
    font-weight: 600;
}
.user-name {
    flex: 1;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.9rem;
    color: var(--color-text);
}
.user-card-more {
    flex-shrink: 0;
    color: var(--color-text-tertiary);
    font-size: 1rem;
}
.user-menu {
    position: absolute;
    left: 8px;
    right: 8px;
    bottom: calc(100% - 4px);
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 6px;
    background: var(--color-surface);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    z-index: 50;
}
.user-menu[hidden] {
    display: none;
}
.user-menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 9px 10px;
    min-height: 40px;
    border: none;
    background: transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-align: left;
    text-decoration: none;
    font-size: 0.9rem;
    color: var(--color-text);
    transition: background var(--duration-fast) var(--ease);
}
.user-menu-item:hover {
    background: var(--color-surface-hover);
}
.user-menu-ico {
    display: inline-flex;
    align-items: center;
    color: var(--color-text-secondary);
    font-size: 1rem;
}