/* 聊天容器整体布局，保证聊天区可见并支持上下滚动 */
.chat-container {
  --chat-surface-color: var(--surface-panel);
  --chat-rail-max: 900px;
  /* 流式宽度：两侧空白固定（消息侧 ≈49px / 输入栏侧 ≈53px），窗口变窄只压缩轨宽；
     57px 的取值与旧 94% 公式在轨宽 900px 临界点处连续，移动端仍覆盖为 100% */
  --chat-rail-fluid: calc(100% - 57px);
  --chat-scrollbar-width: 8px;
  --chat-rail-width: min(var(--chat-rail-max), var(--chat-rail-fluid));
  --chat-message-rail-width: min(
    var(--chat-rail-max),
    calc(var(--chat-rail-fluid) + (var(--chat-scrollbar-width) * 0.94))
  );
  --chat-content-x: 0px;
  --composer-base-height: calc(90px + var(--app-bottom-inset));
  --composer-reserved-height: var(--composer-base-height);
  --composer-growth-height: 0px;
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--chat-surface-color);
  min-width: 0;
  height: var(--app-viewport);
  overflow: hidden;
  position: relative;
  backdrop-filter: blur(6px);
}

.conversation-ribbon {
  position: absolute;
  inset: 0 0 auto 0;
  height: 44px;
  padding: 8px 52px 8px 16px; /* 右侧为快捷窗口展开/收起悬浮按钮预留位置 */
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-primary);
  background: var(--chat-surface-color); /* 与对话区域保持一致且不透明 */
  box-shadow: none;
  pointer-events: auto;
  user-select: none;
  backdrop-filter: none;
  z-index: 40;
  gap: 12px;
}

/* 顶栏下方渐进模糊带：mask-image 与 backdrop-filter 写在同一元素上时，
   新版浏览器内核中模糊会静默失效（2026-08 实测），单元素 mask 渐隐模糊不可用；
   改用三级强度递减的条带（元素本体 + ::before + ::after）模拟渐进模糊，
   上方再由 ::after 颜色渐隐层溶掉阶梯感 */
.conversation-ribbon__blur {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px; /* 带 1（最强）：ribbon 底上 8px ~ 底上 2px */
  height: 6px;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  pointer-events: none;
}

.conversation-ribbon__blur::before,
.conversation-ribbon__blur::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  pointer-events: none;
}

/* 带 2（中等）：与带 1 重叠 1px 避免接缝 */
.conversation-ribbon__blur::before {
  top: 5px;
  height: 7px;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
}

/* 带 3（极轻）：溶掉模糊下边界 */
.conversation-ribbon__blur::after {
  top: 11px;
  height: 6px;
  backdrop-filter: blur(1.2px);
  -webkit-backdrop-filter: blur(1.2px);
}

.conversation-ribbon::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  height: 16px;
  background: var(--chat-surface-color);
  mask-image: linear-gradient(
    180deg,
    rgba(0, 0, 0, 1) 0%,
    rgba(0, 0, 0, 0.6) 55%,
    rgba(0, 0, 0, 0) 100%
  );
  -webkit-mask-image: linear-gradient(
    180deg,
    rgba(0, 0, 0, 1) 0%,
    rgba(0, 0, 0, 0.6) 55%,
    rgba(0, 0, 0, 0) 100%
  );
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  pointer-events: none;
}

.conversation-ribbon__text {
  font-weight: 700;
  font-size: 15px;
  line-height: 1.4;
  letter-spacing: 0.02em;
  font-family: 'Iowan Old Style', ui-serif, Georgia, Cambria, 'Times New Roman', Times, serif;
  max-width: 60%;
  color: var(--text-primary);
  text-shadow: 0 1px 6px var(--shadow-color);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-container.has-title-ribbon .messages-area {
  padding-top: 54px;
}

.chat-container--monitor .virtual-monitor-surface {
  flex: 1;
}

/* 核心聊天区样式，确保对话内容在主面板中可见 */
.chat-area-shell {
  flex: 1;
  min-height: 0;
  position: relative;
  display: flex;
  flex-direction: column;
}

.chat-area-shell > .messages-area {
  flex: 1;
}

/* 左侧用户输入快捷跳转导航 */
.chat-quick-nav {
  position: absolute;
  left: 0; /* left/width 由 JS 按模式（钉死/居中）驱动 */
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 10px 0;
  height: min(62vh, calc(var(--qn-count, 1) * 9px + 20px));
  z-index: 30;
}

/* 居中模式：占满空白宽度，横线水平居中，宽度变化即对称展开 */
.chat-quick-nav--center {
  align-items: center;
}

.qn-line {
  height: 2px;
  width: 8px;
  border-radius: 1px;
  background: var(--text-tertiary);
  opacity: 0.45;
  cursor: pointer;
  /* 宽度（hover 波浪）保持快速；颜色/透明度（当前位置亮灭）走 0.25s 交叉渐变，
     一根逐渐亮起、一根逐渐熄灭，肉眼可分辨但仍然很快 */
  transition: width 0.16s ease, opacity 0.25s ease, background-color 0.25s ease;
  position: relative;
  flex-shrink: 0;
}

/* 扩大每根线的上下热区，「周围」也能触发波浪 */
.qn-line::before {
  content: "";
  position: absolute;
  left: -6px;
  right: -10px;
  top: -5px;
  bottom: -5px;
}

/* 滚动位置同步：当前阅读轮次（与 hover 同色，保证醒目） */
.qn-line.is-current {
  background: var(--text-primary);
  opacity: 1;
}

/* hover 任一根线时，当前位置线让位：只有 hover 的那根亮 */
.chat-quick-nav:hover .qn-line.is-current:not(:hover) {
  background: var(--text-tertiary);
  opacity: 0.45;
}

/* hover 高亮优先于滚动定位 */
.qn-line.is-hot {
  background: var(--text-primary);
  opacity: 1;
}

/* 悬浮预览卡：上行用户原始输入，下行该轮最后一次 AI 输出（Markdown 渲染） */
.quick-nav-preview {
  position: absolute;
  width: 340px;
  height: 116px;
  display: flex;
  flex-direction: column;
  background: var(--surface-raised);
  border: 1px solid var(--border-default);
  border-radius: 12px;
  box-shadow: var(--shadow-mid);
  padding: 14px 16px;
  z-index: 40;
  pointer-events: none;
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity 0.12s ease, transform 0.12s ease;
  overflow: hidden;
}

.quick-nav-preview.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.quick-nav-preview-user {
  flex-shrink: 0;
  font-weight: 600;
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 8px;
}

.quick-nav-preview-ai {
  flex: 1;
  min-height: 0;
  overflow: hidden;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.quick-nav-preview-ai :deep(.markdown-renderer) {
  font-size: inherit;
  line-height: inherit;
  color: inherit;
}

.quick-nav-preview-ai :deep(p) {
  margin: 0 0 4px;
}

.quick-nav-preview-ai :deep(ul),
.quick-nav-preview-ai :deep(ol) {
  margin: 0 0 4px;
  padding-left: 18px;
}

.quick-nav-preview-ai :deep(li) {
  margin-bottom: 2px;
}

.quick-nav-preview-ai :deep(li:last-child),
.quick-nav-preview-ai :deep(p:last-child) {
  margin-bottom: 0;
}

.quick-nav-preview-ai :deep(strong) {
  color: var(--text-primary);
  font-weight: 600;
}

.quick-nav-preview-ai :deep(code) {
  font-size: 12px;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  background: var(--surface-muted);
  border-radius: 4px;
  padding: 0 4px;
}

.quick-nav-preview-ai :deep(pre) {
  margin: 0 0 4px;
  white-space: pre-wrap;
  word-break: break-all;
  font-size: 12px;
}

.quick-nav-preview-ai :deep(h1),
.quick-nav-preview-ai :deep(h2),
.quick-nav-preview-ai :deep(h3),
.quick-nav-preview-ai :deep(h4),
.quick-nav-preview-ai :deep(h5),
.quick-nav-preview-ai :deep(h6) {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 4px;
}

@media (max-width: 640px) {
  .chat-quick-nav {
    display: none;
  }
}

.messages-area {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  overflow-anchor: none;
  padding: 24px;
  padding-top: 30px;
  padding-bottom: 20px;
  min-height: 0;
  position: relative;
  contain: layout style;
}

.messages-area.messages-area--stick {
  overflow-anchor: none;
}

.messages-area.messages-area--render-pending .messages-flow,
.messages-area.messages-area--render-pending .messages-bottom-spacer {
  visibility: hidden;
}

.messages-flow {
  position: relative;
  left: calc(var(--chat-scrollbar-width) / 2);
  width: var(--chat-message-rail-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  contain: layout style;
}

/* 窗口化后 message-block 外层有 virtua 列表项包装，不再是 messages-flow 直接子元素，改用后代选择器 */
.messages-flow .message-block--last {
  margin-bottom: 0;
}

.messages-bottom-spacer {
  width: 1px;
  height: var(--composer-growth-height, 0px);
  min-height: var(--composer-growth-height, 0px);
  pointer-events: none;
  user-select: none;
}

.chat-container .input-area {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 32px;
}

.messages-area::-webkit-scrollbar,
.sidebar::-webkit-scrollbar,
.conversation-list::-webkit-scrollbar {
  width: 8px;
}

.messages-area::-webkit-scrollbar-track,
.sidebar::-webkit-scrollbar-track,
.conversation-list::-webkit-scrollbar-track {
  background: transparent;
}

.messages-area::-webkit-scrollbar-thumb,
.sidebar::-webkit-scrollbar-thumb,
.conversation-list::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 8px;
}

.scroll-lock-toggle {
  position: fixed;
  right: 8px;
  bottom: 100px;
  z-index: 25;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.scroll-to-bottom-fade-enter-active,
.scroll-to-bottom-fade-leave-active {
  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
}

.scroll-to-bottom-fade-enter-from,
.scroll-to-bottom-fade-leave-to {
  opacity: 0;
  transform: translateY(8px);
}

.chat-container--immersive .scroll-lock-toggle {
  right: 8px;
}

.chat-container--mobile {
  --chat-rail-fluid: 100%;
  /* 顶部留白必须放在滚动容器 .messages-area 上（见下），不能放父容器：
     父容器 overflow:hidden + padding-top 会把滚动区整体下推，fixed 顶栏
     （.mobile-panel-trigger）的 backdrop-filter 条带背后只剩纯色背景、
     无消息内容可模糊，移动端模糊因此失效只剩颜色渐隐层（2026-08-30 实测） */
}

/* 顶栏占位 44px + 原消息区间距 8px；滚动容器自身的 padding-top 允许消息
   滚动时进入 fixed 顶栏背后区域（与桌面端 .has-title-ribbon 同理），
   三级渐进模糊条带才有内容可模糊 */
.chat-container--mobile .messages-area {
  padding-top: 52px;
}

/* monitor 面板是 flex 文档流子项、无滚动区，保留容器级留白避开 fixed 顶栏 */
.chat-container--mobile.chat-container--monitor {
  padding-top: 44px;
}

.chat-container--mobile.chat-container--app-shell {
  --chat-scrollbar-width: 0px !important;
  --chat-message-rail-width: var(--chat-rail-width) !important;
}

@media (max-width: 768px) {
  .chat-container {
    --chat-rail-fluid: 100%;
    --composer-base-height: calc(90px + var(--app-bottom-inset));
    --composer-reserved-height: var(--composer-base-height);
  }

  /* .chat-container--mobile 不再设 padding-top：留白已统一挪到滚动容器
     .messages-area（见上方注释），保证顶栏模糊条带背后有可模糊的消息内容 */

  .messages-area {
    padding-top: 8px;
    padding-left: 12px !important;
    padding-right: 12px !important;
  }

  /* 窗口化后每个 message-block 都是包装项的首子，:first-child 会匹配所有块，改用显式 class */
  .message-block--first {
    margin-top: 0;
  }

  .user-message .message-text {
    max-width: 80% !important;
  }

  .assistant-message .message-text {
    padding: 16px 8px !important;
  }
}

/* 额外的手机端样式，不依赖 mobile 类 */
@media (max-width: 768px) {
  .messages-flow {
    left: 0;
    padding-left: 0;
    padding-right: 0;
  }
}

.conversation-ribbon__selector {
  pointer-events: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0;
  border-radius: 0;
  border: none;
  background: transparent;
  box-shadow: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 15px;
  line-height: 1.35;
  font-family: 'Iowan Old Style', ui-serif, Georgia, Cambria, 'Times New Roman', Times, serif;
  cursor: pointer;
  transition: color 0.15s ease;
}

.conversation-ribbon__selector:hover {
  color: var(--text-primary);
}

.conversation-ribbon__selector:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.conversation-ribbon__selector.open {
  color: var(--text-primary);
}

.selector-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.selector-model {
  font-weight: 700;
}

.selector-sep {
  opacity: 0.6;
}

.selector-mode {
  font-weight: 500;
  color: var(--text-secondary);
}

.selector-caret {
  width: 14px;
  height: 14px;
  stroke: currentColor;
}

.model-mode-dropdown {
  position: absolute;
  top: 48px;
  left: 16px;
  display: grid;
  grid-template-columns: minmax(0, 300px) minmax(220px, 1fr);
  gap: 12px;
  padding: 12px;
  border-radius: 14px;
  background: var(--surface-soft);
  box-shadow: none;
  pointer-events: auto;
  width: min(720px, calc(100vw - 32px));
  max-width: calc(100vw - 32px);
  z-index: 50;
}

.model-mode-dropdown--mobile {
  position: fixed;
  top: 52px;
  left: 12px;
  right: auto;
  width: min(480px, calc(100vw - 24px));
  min-width: 0;
  max-width: min(480px, calc(100vw - 24px));
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  z-index: 1600;
}

.model-mode-dropdown--mobile .dropdown-item {
  grid-template-columns: 1fr auto;
}

.model-mode-dropdown--mobile .item-desc {
  display: none;
}

.dropdown-column {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* 运行模式列内的推理强度滑块：与上方选项用分隔线区分 */
.dropdown-effort {
  margin-top: 8px;
  padding: 10px 4px 2px;
  border-top: 1px solid var(--border-default);
}

.dropdown-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.dropdown-list--models {
  max-height: 320px; /* 最多显示约 5 个模型 */
  overflow-y: auto;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.dropdown-list--models::-webkit-scrollbar {
  width: 0;
  height: 0;
}

.model-mode-dropdown--mobile .dropdown-list--models {
  max-height: 260px;
}

.dropdown-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-secondary);
  padding: 2px 12px;
}

.dropdown-item {
  text-align: left;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 10px 12px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px;
  cursor: pointer;
  transition: all 0.18s ease;
  color: var(--text-primary);
}

.dropdown-item:hover:not(.disabled) {
  background: var(--hover-bg);
}

.dropdown-item.disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.item-label {
  font-weight: 700;
  font-size: 14px;
}

.item-desc {
  grid-column: 1 / 2;
  font-size: 12px;
  color: var(--text-secondary);
}

.item-check {
  align-self: center;
  font-weight: 800;
  color: var(--text-primary);
}

.header-menu-enter-active,
.header-menu-leave-active {
  transition:
    all 0.16s ease,
    opacity 0.16s ease;
  transform-origin: top left;
}

.header-menu-enter-from,
.header-menu-leave-to {
  opacity: 0;
  transform: translateY(-6px) scale(0.98);
}

.scroll-lock-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border-default);
  background: var(--surface-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: none;
}

.scroll-lock-btn:hover {
  transform: translateY(-2px);
  box-shadow: none;
}

.scroll-lock-toggle.locked .scroll-lock-btn {
  border-color: var(--accent);
  box-shadow: none;
}

.scroll-lock-btn svg {
  width: 18px;
  height: 18px;
  stroke: var(--text-primary);
  stroke-width: 1.8;
  fill: none;
  transition: stroke 0.2s ease;
}

.scroll-lock-toggle.locked .scroll-lock-btn svg {
  stroke: var(--accent);
}

.message-block {
  margin-bottom: 24px;
  min-width: 0;
}

.message-block.message-block--sub-agent-notice {
  margin-bottom: 8px;
}

.message-block.message-block--before-sub-agent-notice {
  margin-bottom: 8px;
}

.message-block.message-block--before-sub-agent-notice .minimal-blocks-container {
  margin-bottom: 8px;
}

.message-block.message-block--before-sub-agent-notice .minimal-blocks-container > :last-child {
  margin-bottom: 0;
}

.message-block.message-block--sub-agent-notice .minimal-blocks-container {
  margin: 0;
}

.user-message {
  display: flex;
  flex-direction: column;
  align-items: flex-end; /* 靠右对齐 */
}

/* 多智能体消息：左侧对话气泡，内部渲染 Markdown */
.user-message.user-message--multi-agent {
  align-items: flex-start;
}

.message-block.message-block--multi-agent {
  margin-bottom: 12px;
}

.user-message.user-message--multi-agent .message-header {
  align-self: flex-start;
}

.user-message.user-message--multi-agent .message-header.message-header--hidden {
  display: none;
}

.user-message.user-message--multi-agent .message-text {
  align-self: flex-start;
}

.user-message.user-message--multi-agent .message-text.user-bubble-text .bubble-text {
  white-space: normal;
  word-break: normal;
}

/* 首尾元素贴合气泡内边距，避免 XML 内容换行导致的空段落撑开间距 */
.user-message.user-message--multi-agent .bubble-text .markdown-text-segment > *:first-child {
  margin-top: 0;
}

.user-message.user-message--multi-agent .bubble-text .markdown-text-segment > *:last-child {
  margin-bottom: 0;
}

.user-message.user-message--multi-agent .bubble-text p:empty {
  display: none;
}

.user-message.user-message--multi-agent .bubble-text h1,
.user-message.user-message--multi-agent .bubble-text h2,
.user-message.user-message--multi-agent .bubble-text h3,
.user-message.user-message--multi-agent .bubble-text h4,
.user-message.user-message--multi-agent .bubble-text h5,
.user-message.user-message--multi-agent .bubble-text h6 {
  margin: 14px 0 6px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
}

.user-message.user-message--multi-agent .bubble-text h1 {
  font-size: 1.5em;
}

.user-message.user-message--multi-agent .bubble-text h2 {
  font-size: 1.3em;
}

.user-message.user-message--multi-agent .bubble-text h3 {
  font-size: 1.15em;
}

.user-message.user-message--multi-agent .bubble-text h4,
.user-message.user-message--multi-agent .bubble-text h5,
.user-message.user-message--multi-agent .bubble-text h6 {
  font-size: 1em;
}

.user-message.user-message--multi-agent .bubble-text p {
  margin: 6px 0;
}

.user-message.user-message--multi-agent .bubble-text strong,
.user-message.user-message--multi-agent .bubble-text b {
  font-weight: 700;
}

.user-message.user-message--multi-agent .bubble-text em,
.user-message.user-message--multi-agent .bubble-text i {
  font-style: italic;
}

.user-message.user-message--multi-agent .bubble-text ul,
.user-message.user-message--multi-agent .bubble-text ol {
  margin: 6px 0;
  padding-left: 1.4em;
}

.user-message.user-message--multi-agent .bubble-text li {
  margin: 3px 0;
}

.user-message.user-message--multi-agent .bubble-text blockquote {
  margin: 10px 0;
  padding: 4px 12px;
  border-left: 3px solid var(--border-default);
  color: var(--text-secondary);
}

.user-message.user-message--multi-agent .bubble-text hr {
  margin: 14px 0;
  border: none;
  border-top: 1px solid var(--border-default);
}

/* 代码/表格底色基于气泡色 chip-bg 派生，避免与气泡背景融为一体 */
.user-message.user-message--multi-agent .bubble-text code {
  font-family: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Consolas', 'Menlo', 'Monaco', 'Courier New', monospace;
  background: color-mix(in srgb, var(--text-primary) 7%, var(--chip-bg));
  padding: 2px 5px;
  border-radius: 4px;
  font-size: 0.9em;
}

.user-message.user-message--multi-agent .bubble-text pre {
  background: color-mix(in srgb, var(--text-primary) 5%, var(--chip-bg));
  padding: 10px 12px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 10px 0;
}

.user-message.user-message--multi-agent .bubble-text pre code {
  background: transparent;
  padding: 0;
}

.user-message.user-message--multi-agent .bubble-text table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0;
  background: transparent;
}

/* 与正文表格同一横线风格：无外框/无竖线/无底色块；
   布局模式（换行/横向滚动）由 utils/tableLayout.ts 判定 */
.user-message.user-message--multi-agent .bubble-text .md-table-scroll,
.user-message.user-message--multi-agent .bubble-text [data-md-table-scroll='1'] {
  display: block;
  width: auto;
  max-width: none;
  margin: 10px 0;
  overflow: hidden;
}

.user-message.user-message--multi-agent .bubble-text .md-table-scroll[data-md-table-mode='scroll'],
.user-message.user-message--multi-agent .bubble-text [data-md-table-scroll='1'][data-md-table-mode='scroll'] {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
}

.user-message.user-message--multi-agent .bubble-text .md-table-scroll > table,
.user-message.user-message--multi-agent .bubble-text [data-md-table-scroll='1'] > table {
  margin: 0;
}

.user-message.user-message--multi-agent .bubble-text [data-md-table-mode='scroll'] > table {
  width: max-content;
  min-width: 100%;
}

.user-message.user-message--multi-agent .bubble-text [data-md-table-mode='scroll'] > table td {
  white-space: nowrap;
}

.user-message.user-message--multi-agent .bubble-text th,
.user-message.user-message--multi-agent .bubble-text td {
  border: none;
  padding: 8px 14px 8px 0;
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}

.user-message.user-message--multi-agent .bubble-text th:last-child,
.user-message.user-message--multi-agent .bubble-text td:last-child {
  padding-right: 0;
}

.user-message.user-message--multi-agent .bubble-text thead th {
  font-weight: 600;
  white-space: nowrap;
  border-bottom: 1.5px solid var(--border-strong);
}

.user-message.user-message--multi-agent .bubble-text tbody td {
  border-bottom: 1px solid var(--border-default);
  overflow-wrap: break-word;
}

.message-block--last
  .user-message:not(.user-message--compact):not(.user-message--brief):not(
    .user-message--multi-agent
  ) {
  position: relative;
}

.message-block--last
  .user-message:not(.user-message--compact):not(.user-message--brief):not(
    .user-message--multi-agent
  )
  .user-bubble-actions {
  position: absolute;
  right: 0;
  top: 100%;
  margin-top: 4px;
  z-index: 1;
}

/* 透明桥接热区：按钮被绝对定位在容器外，与气泡之间有 4px 间隙，
   鼠标从气泡滑向按钮会经过间隙导致 :hover 中断、按钮收回；
   用伪元素覆盖间隙，让 hover 从气泡平滑转移到按钮（仅命中区域，无视觉变化） */
.message-block--last
  .user-message:not(.user-message--compact):not(.user-message--brief):not(
    .user-message--multi-agent
  )
  .user-bubble-actions::before {
  content: '';
  position: absolute;
  left: -12px;
  right: -12px;
  top: -4px;
  height: 4px;
}

.message-block--last .assistant-message .text-output {
  margin-top: 0;
  margin-bottom: 0;
}

.message-block--last .assistant-message .text-content > :last-child,
.message-block--last .assistant-message .markdown-renderer > :last-child,
.message-block--last .assistant-message .markdown-text-segment > :last-child,
.message-block--last .assistant-message .md-table-scroll:last-child,
.message-block--last .assistant-message [data-md-table-scroll='1']:last-child,
.message-block--last .assistant-message .chat-inline-card:last-child,
.message-block--last .assistant-message .chat-inline-card--image:last-child,
.message-block--last .assistant-message .show-file-card:last-child,
.message-block--last .assistant-message .show-file-card-root:last-child {
  margin-bottom: 0 !important;
}

.user-message.user-message--compact {
  align-items: center;
}

.user-message .message-header,
.assistant-message .message-header {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: 0.02em;
}

.assistant-work-status {
  margin-left: 8px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
}

.assistant-generating-placeholder {
  display: inline-flex;
  align-items: center;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.05em;
}

.assistant-generating-letter {
  display: inline-block;
  opacity: 0.42;
  transform: translateY(0);
  animation: assistant-generating-letter-wave 1.6s ease-in-out infinite;
}

@keyframes assistant-generating-letter-wave {
  0%,
  100% {
    opacity: 0.42;
    transform: translateY(0);
  }
  20% {
    opacity: 1;
    transform: translateY(-3px);
  }
  42% {
    opacity: 0.68;
    transform: translateY(0);
  }
}

.user-message .message-text,
.assistant-message .message-text {
  padding: 16px 20px;
  border-radius: 18px;
  font-size: 15px;
  line-height: 1.6;
  box-shadow: none;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-all;
  overflow-wrap: normal;
}

.user-message .message-text {
  background: var(--chip-bg);
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 60%; /* 最大宽度 60% */
  width: fit-content; /* 根据内容自适应宽度 */
  align-self: flex-end; /* 确保靠右 */
}

.user-message.user-message--compact .message-text {
  max-width: min(760px, 88%);
  align-self: center;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 13px;
  color: var(--text-secondary);
  background: var(--theme-surface-card);
  border: 1px solid var(--theme-control-border);
}

/* 简略信息：以横跨显示区域的横线包裹一行概要文字（类似 markdown 的 --- 分隔线）。 */
.user-message.user-message--brief {
  align-items: stretch;
  width: 100%;
}

.user-message.user-message--brief .compact-brief-line {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  margin: 2px auto;
  color: var(--text-secondary);
  user-select: none;
}

.user-message.user-message--brief .compact-brief-line::before,
.user-message.user-message--brief .compact-brief-line::after {
  content: '';
  flex: 1 1 auto;
  height: 0;
  border-top: 1px solid var(--theme-control-border);
}

.user-message.user-message--brief .compact-brief-text {
  flex: 0 0 auto;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  white-space: nowrap;
  opacity: 0.9;
}

.user-message .message-text .user-skill-link,
.user-message .message-text .user-file-link {
  color: var(--state-info);
  font-weight: 600;
  display: inline-block;
  margin: 0 0.25em;
}

/* 用户输入气泡：超长折叠、展开动画与悬停操作按钮 */
.user-message .message-text.user-bubble-text .bubble-text {
  overflow: hidden;
  transition: max-height 300ms cubic-bezier(0.4, 0, 0.2, 1);
  max-height: var(--bubble-full-height, 9999px);
  white-space: pre-wrap;
  word-break: break-all;
  position: relative;
}

.user-message .message-text.user-bubble-text.is-history-loading .bubble-text {
  transition: none !important;
}

/* 可折叠气泡容器 */
.user-message .message-text.user-bubble-text.is-expandable {
  position: relative;
}

/* 可折叠气泡：多显示一行，底部竖直渐变淡出 */
.user-message .message-text.user-bubble-text.is-expandable .bubble-text:not(.is-expanded) {
  max-height: calc(var(--bubble-fold-height, 240px) + 1.6em);
}

.user-message .message-text.user-bubble-text.is-expandable .bubble-text::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1.6em;
  background: linear-gradient(to bottom, transparent, var(--chip-bg));
  pointer-events: none;
  opacity: 1;
  transition: opacity 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

.user-message .message-text.user-bubble-text.is-expandable .bubble-text.is-expanded::after {
  opacity: 0;
}

/* 展开/收起按钮：
   - 折叠时：向上浮到 bubble-text 底部，与最后一行文字同处一行，带水平渐变
   - 展开时：margin-top 恢复为 0，单独一行在内容下方 */
.user-bubble-expand-row {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  margin-top: 0;
  margin-bottom: 0;
  opacity: 1;
  transform: none;
  pointer-events: auto;
  align-self: flex-end;
  width: 100%;
  min-height: 22px;
  transition: margin-top 300ms cubic-bezier(0.4, 0, 0.2, 1), background 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

.user-message .message-text.user-bubble-text.is-expandable .bubble-text:not(.is-expanded) ~ .user-bubble-expand-row {
  margin-top: -1.6em;
  min-height: 1.6em;
  align-items: flex-end;
  background: linear-gradient(to right, transparent 0%, transparent 50%, var(--chip-bg) 100%);
  border-bottom-right-radius: 18px;
}

.user-message .message-text.user-bubble-text.is-expandable .bubble-text.is-expanded ~ .user-bubble-expand-row {
  margin-top: 0;
  background: transparent;
  border-bottom-right-radius: 0;
}

.user-bubble-expand-row .user-bubble-expand-btn {
  width: 22px;
  height: 22px;
  margin: 0;
  padding: 0;
  opacity: 1;
  transform: none;
  pointer-events: auto;
  background: transparent;
  color: var(--text-tertiary);
  border-radius: 4px;
  transition: color 140ms ease;
}

.user-bubble-expand-row .user-bubble-expand-btn:hover {
  background: transparent;
  color: var(--text-primary);
}

.user-bubble-actions {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 4px;
  margin-top: 6px;
  opacity: 0;
  transform: translateY(4px);
  pointer-events: none;
  transition:
    opacity 180ms ease,
    transform 180ms ease;
  white-space: normal;
  align-self: flex-end;
}

.user-bubble-time {
  font-size: 12px;
  color: var(--text-secondary);
  margin-left: auto;
  padding-left: 8px;
  line-height: 20px;
  user-select: none;
}

.user-message:not(.user-message--compact):not(.user-message--brief):hover .user-bubble-actions,
.user-message:not(.user-message--compact):not(.user-message--brief):focus-within .user-bubble-actions {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.user-bubble-action-btn {
  width: 20px;
  height: 20px;
  border: none;
  border-radius: 6px;
  padding: 0;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition:
    background-color 140ms ease,
    color 140ms ease;
  flex-shrink: 0;
}

.user-bubble-action-btn:hover {
  background-color: var(--theme-tab-active);
  color: var(--text-primary);
}

.user-bubble-action-btn::before {
  content: '';
  width: 14px;
  height: 14px;
  display: block;
  background: currentColor;
  mask: center / contain no-repeat;
  -webkit-mask: center / contain no-repeat;
}

.user-bubble-action-btn.copy::before {
  mask-image: url('/static/icons/copy.svg');
  -webkit-mask-image: url('/static/icons/copy.svg');
}

.user-bubble-action-btn.copy.copied::before {
  mask-image: url('/static/icons/check.svg');
  -webkit-mask-image: url('/static/icons/check.svg');
}

.user-bubble-action-btn.branch::before {
  mask-image: url('/static/icons/git-fork.svg');
  -webkit-mask-image: url('/static/icons/git-fork.svg');
}

.user-bubble-action-btn.user-bubble-expand-btn::before {
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  transition: transform 260ms cubic-bezier(0.4, 0, 0.2, 1);
}

.user-bubble-action-btn.user-bubble-expand-btn.expanded::before {
  transform: rotate(180deg);
}

.assistant-message .message-text {
  background: var(--highlight);
  border-left: 4px solid var(--accent);
}

.user-message .message-text.user-bubble-text .image-inline-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  line-height: 1.4;
  padding-bottom: 2px;
}

.user-message .message-text.user-bubble-text .image-thumbnail-wrapper {
  position: relative;
  width: 60px;
  height: 60px;
  border-radius: 6px;
  overflow: hidden;
  cursor: pointer;
  border: 1px solid var(--border-default);
}

.user-message .message-text.user-bubble-text .image-thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.assistant-generating-block {
  width: 100%;
}

.text-content.assistant-generating-placeholder {
  display: flex;
  width: 100%;
  align-items: center;
  gap: 0.08em;
  padding: 8px 0 16px;
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: 0.08em;
  background: transparent;
  border: none;
  box-shadow: none;
}

.assistant-generating-letter {
  display: inline-block;
  opacity: 0.35;
  transform: translateY(0);
  animation: assistant-generating-wave 1.6s ease-in-out infinite;
}

@keyframes assistant-generating-wave {
  0%,
  100% {
    opacity: 0.35;
    transform: translateY(0);
  }
  20% {
    opacity: 1;
    transform: translateY(-3px) scale(1.05);
  }
  40% {
    opacity: 0.65;
    transform: translateY(0);
  }
}

.thinking-content {
  white-space: pre-wrap;
  word-wrap: break-word;
  font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
  scrollbar-width: none;
}

.thinking-content::-webkit-scrollbar {
  display: none;
}

.collapsible-block {
  background: transparent;
  border-radius: 12px;
  margin-bottom: 12px;
  overflow: hidden;
  border: 1px solid var(--border-default);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: none;
}

.collapsible-header {
  padding: 9px 13px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  user-select: none;
  background: transparent;
  transition: background-color 0.2s ease;
  position: relative;
  min-height: 36px;
  max-height: 36px;
  overflow: hidden;
}

.collapsible-header:hover {
  background: var(--highlight);
}

/* 深色模式下块 hover 对齐对话列表 hover 颜色 */
body[data-theme='dark'] .collapsible-header:hover {
  background: var(--hover-bg) !important;
}

.arrow {
  width: 16px;
  min-width: 16px;
  height: 16px;
  flex: 0 0 16px;
  background-color: currentColor;
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 32 32'%3E%3Cpath d='M13.5 10L19 16L13.5 22' stroke='%23000' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 32 32'%3E%3Cpath d='M13.5 10L19 16L13.5 22' stroke='%23000' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  mask-size: contain;
  -webkit-mask-size: contain;
  mask-repeat: no-repeat;
  -webkit-mask-repeat: no-repeat;
  mask-position: center;
  -webkit-mask-position: center;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  color: var(--text-secondary);
}

/* 移除旧的 ::before 箭头 */
.arrow::before {
  content: none;
}

.collapsible-block.expanded .arrow {
  transform: rotate(90deg);
}

.status-icon {
  width: 20px;
  min-width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 20px;
}

.captured-status {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--text-primary);
}

.collapsible-content {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  /* content-visibility 也进过渡列表：收起动画播完才跳过子树渲染，
     展开时立即恢复渲染（离散属性的方向性插值），收起动画得以完整呈现 */
  transition:
    max-height 260ms cubic-bezier(0.4, 0, 0.2, 1),
    opacity 220ms cubic-bezier(0.4, 0, 0.2, 1),
    content-visibility 260ms;
  /* 让离散属性可过渡；不支持的引擎忽略此属性，退化为收起时立即跳过渲染，
     max-height/opacity 动画本体不受影响 */
  transition-behavior: allow-discrete;
  /* 始终隐藏滚动条，避免堆叠模式展开时闪现 */
  scrollbar-width: none;
  -ms-overflow-style: none;
  will-change: max-height, opacity;
}

.collapsible-content::-webkit-scrollbar {
  display: none;
}

/* 折叠态跳过整个子树渲染：max-height:0 只裁视觉，DOM 仍全量参与布局，
   大步骤组/长思维链会在窗口拖拽时逐帧重排导致卡顿。
   隐藏翻转由上方过渡延迟到收起动画结束后生效；展开时立即恢复渲染，
   由 rAF 测量强制同步布局取真实高度，不受影响。 */
.collapsible-block:not(.expanded) .collapsible-content {
  content-visibility: hidden;
  contain-intrinsic-size: 0;
}

.collapsible-block.expanded .collapsible-content {
  max-height: var(--collapse-max, 600px);
  overflow-y: auto;
  opacity: 1;
}

.content-inner {
  padding: 13px 13px 13px 37px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
  scrollbar-width: none;
}

.content-inner::-webkit-scrollbar {
  display: none;
}

.action-item {
  animation: slideInFade 0.6s cubic-bezier(0.4, 0, 0.2, 1) both;
}

.action-item.no-entry-animation {
  animation: none !important;
}

.action-item.streaming-content,
.action-item.immediate-show {
  animation: quickFadeIn 0.2s ease-out both;
}

.action-item.completed-tool {
  animation: slideInFade 0.4s cubic-bezier(0.4, 0, 0.2, 1) both;
  animation-delay: 100ms;
}

.action-item.thinking-finished {
  animation: none;
}

.stacked-blocks-wrapper {
  margin: 12px 0 8px;
}

.stacked-shell {
  position: relative;
  border: 1px solid var(--border-default);
  border-radius: 16px;
  /* 背景保持透明（沿用 token 清理前的实际视觉）：深色下 --surface-card 比聊天区底色更黑，
     实色底会让半透明 hairline 边框的亮度差被放大，看起来像边框变浅 */
  background: transparent;
  box-shadow: none;
  overflow: hidden;
  min-height: 0;
}

.stacked-inner {
  position: relative;
  width: 100%;
}

.stacked-viewport {
  overflow: hidden;
  position: relative;
  width: 100%;
}

.stacked-item {
  border-bottom: 1px solid var(--border-default);
}

.stacked-item:last-child {
  border-bottom: none;
}

/* 隐藏边线模式 */
.stacked-shell--no-borders .stacked-item {
  border-bottom: none;
}

.stacked-block {
  margin: 0;
  border: none;
  border-radius: 0;
  box-shadow: none;
  background: transparent;
}

.stacked-more-block {
  position: absolute;
  inset: 0 0 auto 0;
  /* 与 shell 一致保持透明，避免深色下顶部出现一条更黑的色带 */
  background: transparent;
  border-bottom: 0 solid var(--border-default);
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 22px;
  height: 0;
  opacity: 0;
  overflow: hidden;
  cursor: pointer;
  z-index: 2;
  transition:
    height 280ms cubic-bezier(0.25, 0.9, 0.3, 1),
    padding 280ms cubic-bezier(0.25, 0.9, 0.3, 1),
    border-bottom-width 280ms cubic-bezier(0.25, 0.9, 0.3, 1),
    opacity 160ms ease;
}

.stacked-more-block.visible {
  opacity: 1;
  padding: 14px 22px;
  border-bottom-width: 1px;
}

.more-icon {
  width: 18px;
  height: 18px;
  display: inline-block;
  object-fit: contain;
}

body[data-theme='dark'] .more-icon {
  filter: brightness(0) invert(1);
}

.more-copy {
  display: flex;
  flex-direction: column;
  gap: 2px;
  user-select: none;
  -webkit-user-select: none;
}

.more-title {
  font-weight: 700;
  color: var(--text-primary);
}

.more-desc {
  color: var(--text-secondary);
  font-size: 12px;
}

.stacked-enter-from {
  opacity: 0;
  transform: translateY(14px);
}

.stacked-enter-active,
.stacked-appear-active {
  transition: all 220ms cubic-bezier(0.4, 0, 0.2, 1);
  transition-delay: 120ms;
}

.stacked-leave-active {
  position: absolute;
  width: 100%;
  transition: all 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.stacked-leave-to {
  opacity: 0;
  transform: translateY(-12px);
}

.stacked-appear-from {
  opacity: 0;
  transform: translateY(14px);
}

.stacked-move {
  transition: transform 220ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* 堆叠块收起/展开不做淡出：内容保持不透明，由收缩的容器自然裁切（与极简模式一致）。
   注意：不要再给 .stacked-block .collapsible-content 重声明 transition——
   它会以更高特异性覆盖 .collapsible-content 基础规则（含 content-visibility 过渡），
   曾因漏写 content-visibility 导致收起时内容瞬间消失、块高瞬间坍塌。 */
.stacked-block .collapsible-content {
  opacity: 1;
}

.progress-indicator {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  background: var(--accent);
  animation: progress-bar 2s ease-in-out infinite;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.collapsible-block.processing .progress-indicator {
  opacity: 1;
}

@keyframes progress-bar {
  0% {
    width: 0%;
    left: 0%;
  }
  50% {
    width: 40%;
    left: 30%;
  }
  100% {
    width: 0%;
    left: 100%;
  }
}

.status-text {
  font-size: 14px;
  color: var(--text-primary);
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
}

.collapsible-block.processing .status-text {
  color: var(--text-secondary);
}

.tool-desc {
  color: var(--text-secondary);
  font-size: 12px;
  margin-left: 8px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  min-width: 0;
}

@keyframes slideInFade {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes quickFadeIn {
  from {
    opacity: 0;
    transform: translateY(5px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.text-output {
  margin: 16px 0;
  color: var(--text-primary);
  font-size: 15px;
  line-height: 1.7;
}

.chat-inline-card {
  display: block;
  max-width: 100%;
  margin: 14px auto;
  border: 1px solid var(--border-default);
  border-radius: 12px;
  overflow: hidden;
  background: transparent;
  box-shadow: none;
}

.chat-inline-card__body {
  display: block;
  width: 100%;
  overflow: hidden;
  border: 0;
  background: transparent;
}

.chat-inline-card--pending {
  display: flex;
  align-items: center;
  justify-content: center;
}

.chat-inline-card__pending-tip {
  font-size: 13px;
  color: var(--text-secondary);
}

.chat-inline-card__error {
  font-size: 12px;
  color: var(--text-secondary);
  text-align: center;
}

.chat-inline-card__caption {
  font-size: 12px;
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.4;
  padding: 0 8px;
}

.chat-inline-card--image {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  margin: 14px 0;
  border: 0;
  box-shadow: none;
}

.chat-inline-card--image img {
  display: block;
  width: auto;
  min-width: 160px;
  max-width: 80%;
  max-height: 720px;
  object-fit: contain;
  border-radius: 12px;
  border: 1px solid var(--border-default);
  box-shadow: none;
  background: var(--surface-card);
}

.chat-inline-card--error {
  border: 1px dashed var(--accent);
  padding: 6px 10px;
  border-radius: 12px;
  background: var(--highlight);
}

.chat-inline-card--html {
  display: block;
  position: relative;
  width: 100%;
  height: 100%;
  /* 外层 show_html 元素已携带 margin 与 aspect-ratio 尺寸，wrapper 必须撑满父容器；
     若叠加基类 margin 会超出父高度，被 overflow:hidden 裁掉底部边框与圆角 */
  margin: 0;
}

.chat-inline-html__host {
  height: 100%;
}

.chat-inline-card__toolbar {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 6px;
  pointer-events: none;
}

/* ⋯ 菜单按钮：纯文字风格，无边框无背景，hover 仅变色；保留 26px 点击热区 */
.chat-inline-card__menu-btn {
  pointer-events: auto;
  width: 26px;
  height: 26px;
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  line-height: 1;
  /* ⋯ 字形视觉重心偏下，上抬补偵使其看起来居中 */
  padding-bottom: 5px;
  cursor: pointer;
  transition: color 0.18s ease;
}

.chat-inline-card__menu-btn:hover {
  color: var(--text-primary);
}

.chat-inline-card__menu-btn.is-refreshing {
  animation: chat-inline-menu-pulse 0.6s ease 1;
}

@keyframes chat-inline-menu-pulse {
  0% {
    opacity: 1;
  }
  40% {
    opacity: 0.35;
  }
  100% {
    opacity: 1;
  }
}

.chat-inline-html__host--pending {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100%;
  padding: 12px 14px;
}

.chat-inline-html__pending-tip {
  font-size: 13px;
  color: var(--text-secondary);
}

.chat-inline-html__iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: transparent;
}

/* ---------------- show_html 卡片 ⋯ 菜单（全局 fixed 单例） ---------------- */

.show-html-card-menu {
  position: fixed;
  z-index: 3050;
  min-width: 112px;
  padding: 4px;
  background: var(--surface-raised);
  border: 1px solid var(--border-default);
  border-radius: 8px;
  box-shadow: var(--shadow-card);
  animation: show-html-card-menu-in 0.16s ease-out;
}

@keyframes show-html-card-menu-in {
  from {
    opacity: 0;
    transform: translateY(-3px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.show-html-card-menu__item {
  display: flex;
  align-items: center;
  width: 100%;
  height: 32px;
  padding: 0 12px;
  background: none;
  border: none;
  border-radius: 5px;
  font-size: 13px;
  text-align: left;
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.12s ease;
}

.show-html-card-menu__item:hover {
  background: var(--surface-soft);
}

/* ---------------- show_html 全屏预览 overlay ---------------- */

/* 打开期间锁定底层页面滚动（聊天区滚动容器在 body 下） */
html.show-html-fullscreen-open,
html.show-html-fullscreen-open body {
  overflow: hidden;
}

.show-html-fullscreen {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  /* 与聊天区同一套视口高度变量，规避移动端 100vh 地址栏问题 */
  height: var(--app-viewport, 100vh);
  z-index: 3000;
  background: var(--surface-base);
  flex-direction: column;
}

.show-html-fullscreen.is-open {
  display: flex;
}

.show-html-fullscreen__bar {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  /* 手机刘海/状态栏安全区；移动端无法 Esc，关闭按钮必须永远可见可达 */
  padding: calc(8px + env(safe-area-inset-top, 0px))
    calc(10px + env(safe-area-inset-right, 0px)) 8px
    calc(16px + env(safe-area-inset-left, 0px));
  border-bottom: 1px solid var(--border-default);
}

/* 标题 + 提示小字容器：标题优先收缩省略，提示文字更弱一级 */
.show-html-fullscreen__heading {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.show-html-fullscreen__title {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.show-html-fullscreen__notice {
  flex: 0 1 auto;
  font-size: 12px;
  color: var(--text-tertiary);
  line-height: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.show-html-fullscreen__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

/* 全屏预览顶栏按钮：与全站统一关闭按钮（common/CloseButton.vue boxed 变体）同一形态——
   圆角方透明底，hover/active 出现 --hover-bg 底色块（动态 DOM 无法复用组件，样式在此对齐） */
.show-html-fullscreen__btn {
  width: 28px;
  height: 28px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  transition: background 140ms ease, color 140ms ease;
}

@media (hover: hover) {
  .show-html-fullscreen__btn:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
  }
}

.show-html-fullscreen__btn:active {
  background: var(--hover-bg);
  color: var(--text-primary);
}

.show-html-fullscreen__body {
  flex: 1 1 auto;
  min-height: 0;
  position: relative;
}

.show-html-fullscreen__iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: transparent;
}

/* 移动端加大热区，保证触屏可可靠点中关闭按钮 */
@media (max-width: 768px) {
  .show-html-fullscreen__btn {
    width: 36px;
    height: 36px;
    font-size: 16px;
  }
}

/* 兼容旧类名（可逐步移除） */
.chat-inline-image__error {
  @extend .chat-inline-card__error;
}
.chat-inline-image figcaption {
  @extend .chat-inline-card__caption;
}

/* 可点击预览的内容图片统一给放大镜光标提示
   （show_image 卡片 / Markdown 正文图 / 工具结果图，点击由 bootstrap.ts 事件委托承接） */
.chat-inline-image img,
.text-content img,
.tool-result-image img {
  cursor: zoom-in;
}

/* show_html 在 streaming 重建期间会短暂回到原始标签，需提供稳定占位避免 scrollHeight 抖动 */
show_html:not([data-rendered='1']),
show-html:not([data-rendered='1']) {
  display: block;
  width: 100%;
  max-width: 100%;
  min-height: 220px;
  margin: 14px auto;
  box-sizing: border-box;
  overflow: hidden;
  border: 1px solid var(--border-default);
  border-radius: 12px;
  background: transparent;
  box-shadow: none;
}

show_html:not([data-rendered='1'])[ratio='1:1'],
show-html:not([data-rendered='1'])[ratio='1:1'] {
  aspect-ratio: 1 / 1;
}
show_html:not([data-rendered='1'])[ratio='16:9'],
show-html:not([data-rendered='1'])[ratio='16:9'] {
  aspect-ratio: 16 / 9;
}
show_html:not([data-rendered='1'])[ratio='9:16'],
show-html:not([data-rendered='1'])[ratio='9:16'] {
  aspect-ratio: 9 / 16;
}
show_html:not([data-rendered='1'])[ratio='4:3'],
show-html:not([data-rendered='1'])[ratio='4:3'] {
  aspect-ratio: 4 / 3;
}
show_html:not([data-rendered='1'])[ratio='3:4'],
show-html:not([data-rendered='1'])[ratio='3:4'] {
  aspect-ratio: 3 / 4;
}

/* 已渲染（enhance 后）的 show_html 卡片：尺寸完全由 CSS 计算，替代原 JS 内联像素方案。
   宽度基准 620px，同时受容器宽度与高度上限（900px / 90dvh）按比例折算约束；
   比例由 enhance 写入的 --show-html-ar 变量参与计算，窗口/容器变化时浏览器自动重算。 */
show_html[data-rendered='1'],
show-html[data-rendered='1'] {
  display: block;
  box-sizing: border-box;
  overflow: hidden;
  margin: 14px auto;
  max-width: 100%;
  --show-html-ar: 1;
  width: min(620px, calc(100% - 8px), calc(min(90vh, 900px) * var(--show-html-ar)));
  width: min(620px, calc(100% - 8px), calc(min(90dvh, 900px) * var(--show-html-ar)));
  aspect-ratio: var(--show-html-ar);
}

.text-output .text-content {
  padding: 0 var(--chat-content-x);
  max-width: 100%;
  min-width: 0;
  overflow-x: hidden;
}

/* Markdown 行内代码与加粗：在对话区域背景下给出明确对比 */
.text-output .text-content :not(pre) > code {
  font-family:
    'JetBrains Mono', 'SF Mono', 'Fira Code', 'Consolas', 'Menlo', 'Monaco', 'Courier New',
    monospace;
  background: var(--surface-muted);
  color: var(--text-primary);
  padding: 2px 5px;
  border-radius: 4px;
  font-size: 0.9em;
}

.text-output .text-content strong,
.text-output .text-content b {
  font-weight: 700;
  color: var(--text-primary);
}

.text-output .text-content .code-block-wrapper {
  margin-right: calc(var(--chat-content-x) * -1);
  margin-left: calc(var(--chat-content-x) * -1);
}

.text-output pre {
  font-family:
    'JetBrains Mono', 'SF Mono', 'Fira Code', 'Consolas', 'Menlo', 'Monaco', 'Courier New',
    monospace !important;
  font-variant-ligatures: none;
  font-feature-settings:
    'liga' 0,
    'calt' 0;
  line-height: 1.55;
  overflow-x: auto;
  max-width: 100%;
  scrollbar-gutter: stable;
  box-sizing: border-box;
}

.text-output pre code {
  font-family:
    'JetBrains Mono', 'SF Mono', 'Fira Code', 'Consolas', 'Menlo', 'Monaco', 'Courier New',
    monospace !important;
  font-variant-ligatures: none;
  font-feature-settings:
    'liga' 0,
    'calt' 0;
  line-height: 1.55;
  text-shadow: none;
  animation: none !important; /* 防止外部动画样式影响代码块，导致视觉抖动 */
}

/* 表格：清爽横线风格（无外框/无竖线/无底色块）。
   布局模式由 utils/tableLayout.ts 按内容自然宽度判定：
   默认换行模式（表格占满内容区、单元格折行）；
   自然宽度超过阈值时容器打 data-md-table-mode='scroll'，退化为整表横向滚动。 */
.text-output .text-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 0;
}

.text-output .text-content .md-table-scroll,
.text-output .text-content [data-md-table-scroll='1'] {
  display: block;
  width: auto;
  max-width: none;
  margin: 12px calc(var(--chat-content-x) * -1);
  padding: 0 var(--chat-content-x);
  overflow: hidden;
}

.text-output .text-content .md-table-scroll[data-md-table-mode='scroll'],
.text-output .text-content [data-md-table-scroll='1'][data-md-table-mode='scroll'] {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
}

.text-output .text-content .md-table-scroll > table,
.text-output .text-content [data-md-table-scroll='1'] > table {
  margin: 0;
}

.text-output .text-content [data-md-table-mode='scroll'] > table {
  width: max-content;
  min-width: 100%;
}

.text-output .text-content [data-md-table-mode='scroll'] > table td {
  white-space: nowrap;
}

/* 细滚动条仅在滚动模式出现 */
.text-output .text-content .md-table-scroll[data-md-table-mode='scroll']::-webkit-scrollbar,
.text-output .text-content [data-md-table-scroll='1'][data-md-table-mode='scroll']::-webkit-scrollbar {
  height: 8px;
}

.text-output .text-content .md-table-scroll[data-md-table-mode='scroll']::-webkit-scrollbar-track,
.text-output .text-content [data-md-table-scroll='1'][data-md-table-mode='scroll']::-webkit-scrollbar-track {
  background: transparent;
}

.text-output .text-content .md-table-scroll[data-md-table-mode='scroll']::-webkit-scrollbar-thumb,
.text-output .text-content [data-md-table-scroll='1'][data-md-table-mode='scroll']::-webkit-scrollbar-thumb {
  background: color-mix(in srgb, var(--text-secondary) 45%, transparent);
  border-radius: 999px;
}

.text-output .text-content .md-table-scroll[data-md-table-mode='scroll'],
.text-output .text-content [data-md-table-scroll='1'][data-md-table-mode='scroll'] {
  scrollbar-color: color-mix(in srgb, var(--text-secondary) 45%, transparent) transparent;
  scrollbar-width: thin;
}

.text-output .text-content th,
.text-output .text-content td {
  border: none;
  padding: 11px 18px 11px 0;
  text-align: left;
  vertical-align: top;
  font-size: 14px;
}

.text-output .text-content th:last-child,
.text-output .text-content td:last-child {
  padding-right: 0;
}

.text-output .text-content thead th {
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  border-bottom: 1.5px solid var(--border-strong);
}

.text-output .text-content tbody td {
  border-bottom: 1px solid var(--border-default);
  overflow-wrap: break-word;
}

.text-output .text-content hr {
  margin: 32px calc(var(--chat-content-x) * -1);
  border: none;
  border-top: 1px solid var(--border-default);
}

.system-action {
  margin: 12px 0;
  padding: 10px 14px;
  border-radius: 8px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--state-info) 8%, transparent), color-mix(in srgb, var(--state-info) 8%, transparent));
  border-left: 4px solid var(--state-info);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.5;
}

.system-action-content {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.sub-agent-system-summary-line {
  padding: 0 20px 0 15px;
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
}

.append-block,
.append-placeholder {
  margin: 12px 0;
  padding: 12px 16px;
  border-radius: 10px;
  background: var(--theme-surface-soft);
  border-left: 4px solid var(--accent);
  box-shadow: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--text-primary);
}

.append-block.append-error,
.append-placeholder.append-error {
  background: color-mix(in srgb, var(--state-danger) 8%, var(--surface-soft));
  border-left-color: color-mix(in srgb, var(--state-danger) 40%, transparent);
}

.append-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
}

.code-block-wrapper {
  border: 1px solid var(--border-default);
  border-radius: 20px;
  overflow: hidden;
  margin: 16px 0;
  background: var(--theme-surface-strong);
  min-height: 80px;
  box-shadow: none;
}

.code-block-wrapper[data-streaming='1'] {
  min-height: 92px;
}

.code-block-header {
  min-height: 44px;
  background: var(--theme-surface-strong);
  padding: 0 12px 0 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-default);
}

.code-language {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1;
  letter-spacing: -0.01em;
  font-family: inherit;
  font-weight: 500;
}

.copy-code-btn {
  width: 32px;
  height: 32px;
  border: none;
  padding: 0;
  border-radius: 10px;
  background-color: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  opacity: 0.9;
  transition:
    background-color 140ms ease,
    color 140ms ease;
  position: relative;
}

.copy-code-btn::before {
  content: '';
  width: 18px;
  height: 18px;
  display: block;
  margin: auto;
  background: currentColor;
  mask: url('/static/icons/copy.svg') center / contain no-repeat;
  -webkit-mask: url('/static/icons/copy.svg') center / contain no-repeat;
}

.copy-code-btn:hover {
  background-color: var(--theme-tab-active);
  color: var(--text-primary);
}

.copy-code-btn.copied::before {
  mask-image: url('/static/icons/check.svg');
  -webkit-mask-image: url('/static/icons/check.svg');
}

.code-block-wrapper pre {
  background: var(--theme-surface-strong) !important;
  padding: 18px 20px 22px !important;
  margin: 0 !important;
  border-radius: 0 !important;
  border: none !important;
  font-family:
    'JetBrains Mono', 'SF Mono', 'Fira Code', 'Consolas', 'Menlo', 'Monaco', 'Courier New',
    monospace !important;
  font-variant-ligatures: none;
  font-feature-settings:
    'liga' 0,
    'calt' 0;
  font-size: 15px;
  line-height: 1.64;
  overflow-x: auto;
  max-width: 100%;
  scrollbar-gutter: stable;
  box-sizing: border-box;
}

.code-block-wrapper[data-streaming='1'] pre {
  min-height: 40px;
}

.code-block-wrapper pre code {
  background: transparent !important;
  padding: 0 !important;
  border: 0 !important;
  box-shadow: none !important;
  color: var(--text-primary);
  font-family:
    'JetBrains Mono', 'SF Mono', 'Fira Code', 'Consolas', 'Menlo', 'Monaco', 'Courier New',
    monospace !important;
  font-variant-ligatures: none;
  font-feature-settings:
    'liga' 0,
    'calt' 0;
  line-height: 1.64;
  text-shadow: none;
  animation: none !important; /* 避免被其他动画样式污染导致行距抖动 */
}

:root[data-theme='dark'] .code-block-wrapper pre,
:root[data-theme='dark'] .code-block-wrapper pre code,
:root[data-theme='dark'] .code-block-wrapper pre code span {
  background: transparent !important;
  border: 0 !important;
  box-shadow: none !important;
  outline: 0 !important;
  text-shadow: none !important;
}

:root[data-theme='dark'] .code-block-wrapper pre {
  background: var(--theme-surface-strong) !important;
}

.streaming-text {
  display: block;
}

.cursor-blink {
  animation: blink 1s steps(1) infinite;
  color: var(--accent);
}

@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
}

// ===== show_file 预览卡片外层容器 =====
// 实际样式由 ShowFileCard.vue 的 scoped style 控制，
// 这里只保留对 .show-file-card-root 的最小兜底
.show-file-card-root {
  max-width: 100%;
}

// ===== 文件下载链接样式（download:// 与工作区相对路径链接统一） =====
// 版式对齐 ChatGPT：文件图标 + 链接文字 + 虚线下划线；颜色全部走三主题语义 token
a.md-download-link {
  color: var(--text-primary);
  text-decoration: underline dotted;
  text-decoration-color: var(--text-tertiary);
  text-underline-offset: 3px;
  /* 行高 2.5（正文 1.6）：撑高所在行盒，与上下两行拉开明显间距 */
  line-height: 2.5;
  cursor: pointer;
  transition:
    color 0.15s,
    text-decoration-color 0.15s;

  // 文件图标：mask 上色，跟随正文色（深色模式近白、浅色近黑）
  &::before {
    content: '';
    display: inline-block;
    /* 图标大于字高：顶部略过帽高线，底部下移到虚线下划线处（基线下 3px） */
    width: 16px;
    height: 16px;
    margin-right: 4px;
    vertical-align: -3px;
    background-color: var(--text-primary);
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='black' stroke-width='1.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9.5 1.5h-5a1 1 0 0 0-1 1v11a1 1 0 0 0 1 1h7a1 1 0 0 0 1-1V4.5L9.5 1.5z'/%3E%3Cpath d='M9.5 1.5v3h3'/%3E%3Cpath d='M6 8h4M6 10.5h4'/%3E%3C/svg%3E");
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='black' stroke-width='1.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9.5 1.5h-5a1 1 0 0 0-1 1v11a1 1 0 0 0 1 1h7a1 1 0 0 0 1-1V4.5L9.5 1.5z'/%3E%3Cpath d='M9.5 1.5v3h3'/%3E%3Cpath d='M6 8h4M6 10.5h4'/%3E%3C/svg%3E");
    -webkit-mask-size: contain;
    mask-size: contain;
    -webkit-mask-repeat: no-repeat;
    mask-repeat: no-repeat;
    -webkit-mask-position: center;
    mask-position: center;
  }

  &:hover {
    color: var(--accent);
    text-decoration-color: var(--accent);
  }
}

// ===== 行内引用胶囊（citation chip） =====
// 交互约定：hover / 展开态只变色，不动边框；弹层交互见 CitationPopover.vue
.md-citation-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 20px;
  padding: 0 7px;
  margin: 0 2px;
  border-radius: 999px;
  font-size: 12px;
  line-height: 1;
  white-space: nowrap;
  vertical-align: middle; // 几何中心对齐「基线 + x字高/2」——与文字完全上下居中，且 20px 盒仍在 25.5px 行框内不撑行
  background: var(--surface-muted);
  border: 1px solid var(--border-default);
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
  transition: background 0.15s, color 0.15s;

  &:hover,
  &.is-open {
    background: var(--hover-bg);
    color: var(--text-primary);
  }

  &.is-pending {
    cursor: default;
  }

  .chip-icons {
    display: inline-flex;
    align-items: center;
    flex: none;
  }

  .chip-favicon {
    width: 12px;
    height: 12px;
    border-radius: 3px;
    flex: none;
  }

  // 双图标叠放：favicon 与字母兜底的任意相邻组合保持一致视觉
  .chip-favicon + .chip-favicon,
  .chip-letter + .chip-letter,
  .chip-favicon + .chip-letter,
  .chip-letter + .chip-favicon {
    margin-left: -5px;
    border: 1px solid var(--surface-muted);
  }

  .chip-file-icon {
    width: 12px;
    height: 12px;
    flex: none;
    color: var(--text-tertiary);
  }

  .chip-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 12px;
    height: 12px;
    border-radius: 3px;
    flex: none;
    font-size: 8px;
    font-weight: 700;
    color: var(--on-accent);
    background: var(--accent);
  }

  .chip-label {
    max-width: 140px;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 500;
    // 行高 1 会把 j/g/y 等字母的下沉笔画裁掉；放大行高让 descender 落入盒内
    // （chip 总高 20px 由自身 height 锁定，行高放大不撑高）
    line-height: 1.4;
  }

  .chip-count {
    color: var(--text-tertiary);
    font-weight: 500;
    line-height: 1.4;
  }

  &:hover .chip-count,
  &.is-open .chip-count {
    color: var(--text-secondary);
  }

  .chip-pending-dot {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--text-tertiary);
    margin: 0 4px;
  }
}

// ===== 数学公式样式 =====
.math-block {
  display: block;
  margin: 16px 0;
  overflow-x: auto;
  overflow-y: hidden;
  text-align: center;
  scrollbar-width: thin;
  scrollbar-color: color-mix(in srgb, var(--text-secondary) 55%, transparent) transparent;

  &::-webkit-scrollbar {
    height: 6px;
  }

  &::-webkit-scrollbar-track {
    background: transparent;
  }

  &::-webkit-scrollbar-thumb {
    background: color-mix(in srgb, var(--text-secondary) 55%, transparent);
    border-radius: 999px;
  }

  .katex-display {
    display: inline-block;
    margin: 0;
    text-align: initial;
  }
}

.math-inline {
  display: inline-block;
  vertical-align: middle;
  line-height: 1;
}

/* ========== 深色主题变体（对话区组件） ========== */
body[data-theme='dark'] {
  /* 用户消息块 - 使用浅灰色 */
  .user-message .message-text {
    background: var(--badge-bg);
    box-shadow: none;
  }

  /* AI 消息块 - 使用浅灰色 */
  .assistant-message .message-text {
    background: var(--badge-bg);
    border-left-color: var(--border-strong);
  }

  /* 思考块和工具块 - 使用更深的颜色（类似选中状态） */
  .thinking-block,
  .tool-block,
  .collapsible-block {
    background: var(--surface-panel);
  }

  .collapsible-header {
    background: var(--surface-panel);
  }

  /* 代码块 - 代码区域纯黑底+白字 */
  .code-block-wrapper {
    background: var(--badge-bg);
    border-color: var(--border-card-strong);
  }

  .text-output pre {
    background: var(--surface-base) !important;
    color: var(--text-primary);
  }

  .text-output pre code {
    background: transparent !important;
    color: var(--text-primary);
  }

  /* 表格为无底色横线风格，三主题通用，无需覆盖 */

  /* 滚动锁定按钮 */
  .scroll-lock-btn {
    background: var(--badge-bg);
    border-color: var(--border-card-strong);
    box-shadow: none;
  }

  .scroll-lock-btn:hover {
    background: var(--surface-muted);
    box-shadow: none;
  }

  .scroll-lock-toggle.locked .scroll-lock-btn {
    border-color: color-mix(in srgb, var(--on-accent) 20%, transparent);
    box-shadow: none;
  }

  .scroll-lock-toggle.locked .scroll-lock-btn img {
    filter: brightness(0) invert(1);
  }

  .scroll-lock-toggle.locked .scroll-lock-btn svg {
    stroke: var(--text-primary);
  }

  /* 顶部栏 - 黑色背景，白色字体 */
  .conversation-ribbon {
    background: var(--surface-panel) !important;
  }

  .conversation-ribbon::after {
    background: var(--surface-panel) !important;
  }

  /* 模型选择下拉菜单 - 和输入栏一样的底色 */
  .model-mode-dropdown {
    background: var(--badge-bg) !important;
    box-shadow: none !important;
  }

  /* hover 与输入栏按钮一致（--hover-bg），与菜单底色拉开对比 */
  .dropdown-item:hover:not(.disabled) {
    background: var(--hover-bg) !important;
  }
}


/* ========== 明亮主题变体（对话区组件） ========== */
/* 背景：浅色主题表面 token 阶梯近乎纯平（base/card/raised 全为 #ffffff），
   基础样式中代码块白底落白底不可见；
   参照上方深色覆盖块的做法，按用户确认的方向做组件级补偿：
   代码块仅头部着色、代码区与对话底保持同色。
   表格为无底色横线风格，三主题通用，无需补偿。 */
body[data-theme='light'] {
  /* 代码块 - 头部浅灰、代码区与对话底同为白色，外框加强到可见 */
  .code-block-wrapper {
    border-color: var(--border-strong);
  }

  .code-block-header {
    background: var(--surface-muted);
    border-bottom-color: var(--border-strong);
  }
}