/* ============================================================================
   AI-PM 文档问答助手(chat-widget.css,2026-08-24)

   扁平化胶囊入口 + 全高右侧栏面板:
   - FAB 右下角扁平胶囊(图标 + 「询问助手」引导语,z-index 60);
     面板 z-index 70
   - 桌面端(≥1220px,主题 76.25em 断点):面板 fixed 侧栏——左缘对齐三列
     网格右栏(TOC 栏)左缘(不切入正文列,JS 实测 inline left/width;
     无 TOC 页回落为 clamp(21rem,32vw,30rem) 贴右缘;↗ 加宽 min(46rem,94vw)),
     右缘贯通视口,顶边 = 吸顶导航栏(md-header/md-tabs)下缘(不盖住导航,
     随滚动跟随),底边停在 mkdocs 页脚(md-footer)上缘(不遮挡页脚,
     随滚动重算);移动端(<1220px):全屏覆盖;点击立即弹出/收起(无滑入动画)
   - 头部:spark 图标 + 「助手」+ 图标按钮(清空/加宽/关闭);
     消息区顶部常驻免责条
   - 输入区为卡片式:无边框 textarea + 底部图标行(回形针附件 / 圆形
     发送),附件 chips 内嵌卡片顶部
   - 颜色全部走 Material --md-* 变量,亮/暗主题自动适配
   - prefers-reduced-motion:禁位移动画
   ============================================================================ */

/* ----------------------------------------------------------------------------
   1. FAB 扁平胶囊(图标 + 引导语)
   ---------------------------------------------------------------------------- */
.aipm-chat__fab {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 60;
  display: inline-flex;
  align-items: center;
  gap: .38rem;
  height: 2.5rem;
  padding: 0 .95rem 0 .72rem;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
  color: var(--md-accent-bg-color);
  background: var(--md-accent-fg-color);
  box-shadow: 0 2px 10px rgba(0, 0, 0, .18);
  font-family: inherit;
  font-size: .8125rem;
  font-weight: 500;
  transition: transform .16s ease, opacity .16s ease, box-shadow .16s ease;
}
/* hover:微微放大 + 阴影加深(参考 Claude 文档站点右下角按钮) */
.aipm-chat__fab:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 16px rgba(0, 0, 0, .26);
}
.aipm-chat__fab:active {
  transform: scale(.97);
}
.aipm-chat__fab svg {
  width: 1.15rem;
  height: 1.15rem;
  flex: none;
  fill: currentColor;
}
.aipm-chat__fab-label {
  white-space: nowrap;
}
/* 面板打开时收起 FAB(面板自带关闭按钮与 Escape) */
.aipm-chat__fab.is-hidden {
  opacity: 0;
  transform: scale(.85);
  pointer-events: none;
}

/* ----------------------------------------------------------------------------
   2. 面板骨架(文档流内 sticky 右侧栏,扁平实色)
   ---------------------------------------------------------------------------- */
/* position: sticky + top calc(2.4rem + 1px):面板插在页头交界线
   (.md-header__line)之后 —— 页顶时随流贴在 tabs 下缘(flow 位置),
   滚动后吸附到页头下缘(与线同位);与页头/线同为 sticky 一族,弹性
   过滚动时浏览器对 sticky 做什么它就做什么,结构上不可能与页头脱节。
   高度/左边距由 JS(align)写入;关闭态高度 0 不占文档。 */
.aipm-chat {
  position: sticky;
  top: calc(2.4rem + 1px);
  z-index: 70;
  display: flex;
  flex-direction: column;
  width: clamp(21rem, 32vw, 30rem);
  height: 0;                    /* 关闭态不占文档高;打开后 JS 写入 */
  margin-left: auto;            /* 水平几何由 JS 写 inline margin-left */
  overflow: hidden;
  color: var(--md-default-fg-color);
  font-family: var(--md-text-font-family, var(--md-text-font, system-ui, sans-serif));
  font-size: .8125rem;
  line-height: 1.55;
  background: var(--md-default-bg-color);
  /* 与主题分栏一致的分隔方式:仅一条发丝线,不用投影(投影会像浮层) */
  border-left: 1px solid var(--md-default-fg-color--lightest);
  visibility: hidden;
}
/* 点击按钮立即弹出/收起,无滑入动画 */
.aipm-chat.is-open {
  visibility: visible;
}
/* 加宽模式(↗ 切换,JS 记忆) */
.aipm-chat--docked.aipm-chat--wide {
  width: min(46rem, 94vw);
}
/* 移动端(<1220px):全屏覆盖(fixed 覆盖,不参与流内 sticky) */
.aipm-chat:not(.aipm-chat--docked) {
  position: fixed;
  inset: 0;
  top: 0;
  height: auto !important;
  margin: 0 !important;
  width: auto;
  border-left: 0;
}

/* ----------------------------------------------------------------------------
   3. 头部(spark 图标 + 标题 + 图标按钮)
   ---------------------------------------------------------------------------- */
.aipm-chat__head {
  flex: none;
  display: flex;
  align-items: center;
  gap: .35rem;
  padding: .8rem .6rem .8rem 1rem;
}
.aipm-chat__head-icon {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--md-accent-fg-color);
}
.aipm-chat__head-icon svg {
  width: 1.15rem;
  height: 1.15rem;
  fill: currentColor;
}
.aipm-chat__title {
  flex: 1;
  min-width: 0;
  font-size: .9375rem;
  font-weight: 700;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.aipm-chat__iconbtn {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.9rem;
  height: 1.9rem;
  padding: 0;
  border: 0;
  border-radius: .45rem;
  color: var(--md-default-fg-color--light);
  background: transparent;
  cursor: pointer;
  transition: color .12s ease, background-color .12s ease;
}
.aipm-chat__iconbtn:hover {
  color: var(--md-default-fg-color);
  background: var(--md-default-fg-color--lightest);
}
.aipm-chat__iconbtn svg {
  width: 1.05rem;
  height: 1.05rem;
  fill: currentColor;
}

/* ----------------------------------------------------------------------------
   4. 消息区(常驻免责条 / 空态 / 气泡 / 操作行)
   ---------------------------------------------------------------------------- */
.aipm-chat__msgs {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  padding: .25rem 1rem 1rem;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--md-default-fg-color--lighter) transparent;
}
.aipm-chat__msgs::-webkit-scrollbar {
  width: .3rem;
}
.aipm-chat__msgs::-webkit-scrollbar-thumb {
  background: var(--md-default-fg-color--lightest);
  border-radius: .3rem;
}

/* 常驻顶部免责条 */
.aipm-chat__disclaimer {
  margin: 0;
  padding: .35rem 0 .2rem;
  text-align: center;
  font-size: .6875rem;
  color: var(--md-default-fg-color--lighter);
}

/* 空态:欢迎语 + 建议问题 */
.aipm-chat__empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .8rem;
  margin: auto 0;
  padding: .5rem .25rem;
  text-align: center;
}
.aipm-chat__empty-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  color: var(--md-accent-bg-color);
  background: var(--md-accent-fg-color);
}
.aipm-chat__empty-icon svg {
  width: 1.6rem;
  height: 1.6rem;
  fill: currentColor;
}
.aipm-chat__empty-text {
  margin: 0;
  color: var(--md-default-fg-color--light);
}
.aipm-chat__suggest {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  width: 100%;
}
.aipm-chat__suggest-btn {
  width: 100%;
  padding: .5rem .7rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: .6rem;
  background: transparent;
  color: var(--md-default-fg-color);
  font-family: inherit;
  font-size: .75rem;
  text-align: left;
  cursor: pointer;
  transition: border-color .12s ease, background-color .12s ease;
}
.aipm-chat__suggest-btn:hover {
  border-color: var(--md-accent-fg-color);
  background: var(--md-accent-fg-color--transparent);
}

.aipm-chat__msg {
  display: flex;
}
.aipm-chat__msg--user {
  justify-content: flex-end;
}
.aipm-chat__msg--ai {
  justify-content: flex-start;
  flex-direction: column;
  align-items: flex-start;
}
.aipm-chat__bubble {
  max-width: 94%;
  padding: .5rem .75rem;
  border-radius: .9rem;
  word-break: break-word;
  overflow-wrap: anywhere;
}
.aipm-chat__msg--user .aipm-chat__bubble {
  background: var(--md-accent-fg-color--transparent);
  border: 1px solid var(--md-accent-fg-color--transparent);
  border-bottom-right-radius: .25rem;
}
.aipm-chat__msg--ai .aipm-chat__bubble {
  background: var(--md-default-bg-color--lighter);
  border: 1px solid var(--md-default-fg-color--lightest);
  border-bottom-left-radius: .25rem;
}
.aipm-chat__bubble.is-error {
  background: rgba(229, 72, 77, .1);
  border-color: rgba(229, 72, 77, .45);
  color: #e5484d;
}

/* 用户消息内的附件 chips(不可交互,仅展示) */
.aipm-chat__files {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin-top: .45rem;
}
.aipm-chat__file-chip {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  max-width: 100%;
  padding: .18rem .5rem;
  border-radius: .35rem;
  font-size: .75rem;
  background: var(--md-default-bg-color);
  border: 1px solid var(--md-default-fg-color--lightest);
  white-space: nowrap;
  overflow: hidden;
}
.aipm-chat__file-chip svg {
  width: .85rem;
  height: .85rem;
  flex: none;
  fill: var(--md-default-fg-color--light);
}
.aipm-chat__file-chip span {
  overflow: hidden;
  text-overflow: ellipsis;
}

/* 消息内 markdown-lite 排版(不引库) */
.aipm-chat__md p {
  margin: 0 0 .4em;
}
.aipm-chat__md p:last-child {
  margin-bottom: 0;
}
.aipm-chat__md ul,
.aipm-chat__md ol {
  margin: .2em 0 .4em;
  padding-left: 1.2em;
}
.aipm-chat__md li {
  margin: .15em 0;
}
.aipm-chat__md code {
  font-family: var(--md-code-font-family, var(--md-code-font, ui-monospace, monospace));
  font-size: .82em;
  padding: .05em .35em;
  border-radius: .2rem;
  background: var(--md-code-bg-color);
}
.aipm-chat__md a {
  color: var(--md-typeset-a-color);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.aipm-chat__md strong {
  font-weight: 700;
}

/* 「思考中…」占位 */
.aipm-chat__thinking {
  color: var(--md-default-fg-color--light);
  font-style: italic;
}
.aipm-chat__thinking .aipm-chat__dots::after {
  content: "…";
  animation: aipm-chat-blink 1.1s ease-in-out infinite;
}
@keyframes aipm-chat-blink {
  0%, 100% { opacity: .25; }
  50%      { opacity: 1; }
}

/* 来源链接 chips(气泡下方) */
.aipm-chat__sources {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin-top: .5rem;
}
.aipm-chat__chip {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  padding: .18rem .55rem;
  font-size: .75rem;
  border-radius: 999px;
  color: var(--md-typeset-a-color);
  background: var(--md-accent-fg-color--transparent);
  border: 1px solid var(--md-accent-fg-color--transparent);
  text-decoration: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: border-color .12s ease;
}
.aipm-chat__chip:hover {
  border-color: var(--md-accent-fg-color);
}

/* done 一行的用量 */
.aipm-chat__meta {
  margin-top: .4rem;
  font-size: .6875rem;
  color: var(--md-default-fg-color--lighter);
}

/* AI 回答气泡下方常驻操作行:复制 / 重新生成(不随 hover 显隐) */
.aipm-chat__actions {
  display: flex;
  align-items: center;
  gap: .15rem;
  margin-top: .35rem;
}
.aipm-chat__actions[hidden] {
  display: none;
}
.aipm-chat__act {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  padding: 0;
  border: 0;
  border-radius: .3rem;
  color: var(--md-default-fg-color--lighter);
  background: transparent;
  cursor: pointer;
  transition: color .12s ease, background-color .12s ease;
}
.aipm-chat__act:hover {
  color: var(--md-default-fg-color);
  background: var(--md-default-fg-color--lightest);
}
.aipm-chat__act svg {
  width: .95rem;
  height: .95rem;
  fill: currentColor;
}
/* 复制成功:勾替换剪贴板并短暂变 accent */
.aipm-chat__act .aipm-chat__icon-check {
  display: none;
}
.aipm-chat__act.is-copied .aipm-chat__icon-copy {
  display: none;
}
.aipm-chat__act.is-copied .aipm-chat__icon-check {
  display: block;
}
.aipm-chat__act.is-copied {
  color: var(--md-accent-fg-color);
}

/* ----------------------------------------------------------------------------
   5. 输入区(卡片式:附件 chips + 无边框 textarea + 底部图标行)
   ---------------------------------------------------------------------------- */
.aipm-chat__composer {
  flex: none;
  display: flex;
  flex-direction: column;
  margin: .5rem .75rem .8rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: .9rem;
  background: transparent;
  transition: border-color .12s ease, box-shadow .12s ease,
              background-color .12s ease;
}
.aipm-chat__composer:focus-within {
  border-color: var(--md-accent-fg-color);
  box-shadow: 0 0 0 2px var(--md-accent-fg-color--transparent);
}
.aipm-chat__composer.is-dragover {
  border-style: dashed;
  border-color: var(--md-accent-fg-color);
  background: var(--md-accent-fg-color--transparent);
}

/* 待发送附件 chips(可移除,内嵌卡片顶部) */
.aipm-chat__attachbar {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  padding: .55rem .7rem 0;
}
.aipm-chat__attachbar[hidden] {
  display: none;
}
.aipm-chat__attach-chip {
  display: inline-flex;
  align-items: center;
  gap: .3rem;
  max-width: 100%;
  padding: .22rem .3rem .22rem .5rem;
  border-radius: .4rem;
  font-size: .75rem;
  border: 1px solid var(--md-default-fg-color--lightest);
  background: var(--md-default-bg-color--lighter);
  white-space: nowrap;
}
.aipm-chat__attach-chip svg {
  width: .85rem;
  height: .85rem;
  flex: none;
  fill: var(--md-default-fg-color--light);
}
.aipm-chat__attach-name {
  overflow: hidden;
  text-overflow: ellipsis;
}
.aipm-chat__attach-x {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.05rem;
  height: 1.05rem;
  padding: 0;
  border: 0;
  border-radius: 50%;
  color: var(--md-default-fg-color--light);
  background: transparent;
  font-size: .8rem;
  line-height: 1;
  cursor: pointer;
  transition: color .12s ease, background-color .12s ease;
}
.aipm-chat__attach-x:hover {
  color: #e5484d;
  background: rgba(229, 72, 77, .12);
}

.aipm-chat__input {
  width: 100%;
  min-height: 3rem;
  max-height: 10rem;
  padding: .7rem .75rem .25rem;
  border: 0;
  background: transparent;
  color: var(--md-default-fg-color);
  font-family: inherit;
  font-size: inherit;
  line-height: 1.5;
  resize: none;
  outline: none;
  overflow-y: auto;
}
.aipm-chat__input::placeholder {
  color: var(--md-default-fg-color--lighter);
}

/* 卡片底部图标行:左回形针、右圆形发送 */
.aipm-chat__inputrow {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .25rem .5rem .55rem;
}
.aipm-chat__attach {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.9rem;
  height: 1.9rem;
  padding: 0;
  border: 0;
  border-radius: 50%;
  color: var(--md-default-fg-color--light);
  background: transparent;
  cursor: pointer;
  transition: color .12s ease, background-color .12s ease;
}
.aipm-chat__attach:hover,
.aipm-chat__attach.is-active {
  color: var(--md-accent-fg-color);
  background: var(--md-accent-fg-color--transparent);
}
.aipm-chat__attach svg {
  width: 1.1rem;
  height: 1.1rem;
  fill: currentColor;
}
.aipm-chat__send {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.9rem;
  height: 1.9rem;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 50%;
  color: var(--md-accent-bg-color);
  background: var(--md-accent-fg-color);
  cursor: pointer;
  transition: opacity .12s ease, transform .12s ease,
              color .12s ease, background-color .12s ease,
              border-color .12s ease;
}
.aipm-chat__send:hover {
  transform: scale(1.08);
}
/* 空内容:描边圆形弱化态 */
.aipm-chat__send:disabled {
  color: var(--md-default-fg-color--lighter);
  background: transparent;
  border-color: var(--md-default-fg-color--lightest);
  cursor: default;
  transform: none;
}
/* 发送中:按钮变「停止」 */
.aipm-chat__send.is-stop {
  color: #fff;
  background: #e5484d;
}
.aipm-chat__send svg {
  width: 1rem;
  height: 1rem;
  fill: currentColor;
}

/* ----------------------------------------------------------------------------
   6. Netlify 预览站提示条(预览站不挂载 widget,仅显示一行说明)
   ---------------------------------------------------------------------------- */
.aipm-chat--netlify-note {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  z-index: 80;
  padding: .4rem .7rem;
  font-size: .75rem;
  border-radius: .5rem;
  color: var(--md-default-fg-color--light);
  background: var(--md-default-bg-color--lighter);
  border: 1px solid var(--md-default-fg-color--lightest);
}

/* ----------------------------------------------------------------------------
   7. prefers-reduced-motion:禁用位移动画
   ---------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .aipm-chat__fab,
  .aipm-chat {
    transition: none;
  }
  .aipm-chat__fab:hover,
  .aipm-chat__fab:active,
  .aipm-chat__send:hover {
    transform: none;
  }
  .aipm-chat__thinking .aipm-chat__dots::after {
    animation: none;
  }
}