/* ==========================================================================
   DUI 文档中心 · 常驻文档问答助手
   纯原生 CSS，无预处理器、无框架依赖。所有主题变量以 --da- 前缀暴露，
   接入方可在 :root 覆盖，避免与文档中心自身样式冲突。
   ========================================================================== */

:root {
  --da-primary: #165dff;
  --da-primary-hover: #4080ff;
  --da-primary-active: #0e42d2;
  --da-primary-weak: #f0f4ff;

  --da-text-1: #1d2129;
  --da-text-2: #4e5969;
  --da-text-3: #86909c;
  --da-text-4: #a9aeb8;

  --da-bg-page: #ffffff;
  --da-bg-panel: #ffffff;
  --da-bg-hover: #f2f3f5;
  --da-bg-bubble-assistant: #f4f5f7;
  --da-bg-code: #f6f8fa;
  --da-border: #e5e6eb;
  --da-border-light: #f0f1f3;

  --da-danger: #f53f3f;
  --da-danger-weak: #ffece8;
  --da-success: #00b42a;

  --da-radius-sm: 6px;
  --da-radius: 10px;
  --da-radius-lg: 16px;

  --da-shadow-panel: 0 12px 40px rgba(29, 33, 41, 0.14), 0 2px 8px rgba(29, 33, 41, 0.06);
  --da-shadow-launcher: 0 6px 20px rgba(22, 93, 255, 0.35);

  --da-font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --da-font-mono: "SFMono-Regular", Menlo, Consolas, "Liberation Mono", Courier,
    "Courier New", monospace;

  --da-z-index: 2147483000;
}

/* ============================ 悬浮入口 ============================ */

.da-launcher {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: var(--da-z-index);
  width: 56px;
  height: 56px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: var(--da-primary);
  box-shadow: var(--da-shadow-launcher);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.22s cubic-bezier(0.34, 1.2, 0.64, 1), box-shadow 0.22s ease,
    opacity 0.22s ease;
  -webkit-tap-highlight-color: transparent;
}

.da-launcher:hover {
  transform: translateY(-2px) scale(1.04);
  box-shadow: 0 10px 28px rgba(22, 93, 255, 0.45);
}

.da-launcher:active {
  transform: translateY(0) scale(0.96);
}

.da-launcher.is-hidden {
  opacity: 0;
  transform: scale(0.4);
  pointer-events: none;
}

.da-launcher__logo {
  width: 34px;
  height: 34px;
  display: block;
  border-radius: 50%;
  pointer-events: none;
}

/* 未读小红点 */
.da-launcher__badge {
  position: absolute;
  top: -1px;
  right: -1px;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: 9px;
  background: var(--da-danger);
  border: 2px solid var(--da-bg-page);
  color: #fff;
  font-size: 11px;
  line-height: 14px;
  font-weight: 600;
  box-sizing: border-box;
  display: none;
  align-items: center;
  justify-content: center;
}

.da-launcher.has-unread .da-launcher__badge {
  display: flex;
}

/* ============================ 主面板 ============================ */

.da-panel {
  position: fixed;
  right: 24px;
  bottom: 96px;
  z-index: var(--da-z-index);
  width: min(640px, calc(100vw - 48px));
  height: min(800px, calc(100vh - 110px));
  min-height: 460px;
  display: flex;
  flex-direction: column;
  background: var(--da-bg-panel);
  border: 1px solid var(--da-border-light);
  border-radius: var(--da-radius-lg);
  box-shadow: var(--da-shadow-panel);
  font-family: var(--da-font);
  font-size: 14px;
  line-height: 1.6;
  color: var(--da-text-1);
  transform-origin: bottom right;
  opacity: 0;
  transform: translateY(12px) scale(0.96);
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.24s cubic-bezier(0.34, 1.2, 0.64, 1);
}

/* 面板不再裁剪子元素：会话列表需要弹出面板左侧展示 */
.da-header {
  border-radius: var(--da-radius-lg) var(--da-radius-lg) 0 0;
}

.da-composer {
  border-radius: 0 0 var(--da-radius-lg) var(--da-radius-lg);
}

.da-panel.is-open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.da-panel *,
.da-panel *::before,
.da-panel *::after {
  box-sizing: border-box;
}

/* ---------- 顶部栏 ---------- */

.da-header {
  flex: none;
  height: 56px;
  padding: 0 8px 0 16px;
  display: flex;
  align-items: center;
  gap: 4px;
  border-bottom: 1px solid var(--da-border-light);
  background: var(--da-bg-panel);
}

.da-header__brand {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  flex: 1;
}

.da-header__mark {
  flex: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  overflow: hidden;
}

.da-header__mark img,
.da-header__mark svg {
  width: 100%;
  height: 100%;
  display: block;
}

.da-header__title {
  font-size: 15px;
  font-weight: 600;
  color: var(--da-text-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.da-header__sub {
  margin-left: 6px;
  flex: none;
  font-size: 12px;
  color: var(--da-text-3);
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--da-bg-hover);
}

.da-iconbtn {
  flex: none;
  width: 32px;
  height: 32px;
  padding: 0;
  border: none;
  border-radius: var(--da-radius-sm);
  background: transparent;
  color: var(--da-text-2);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, color 0.15s ease;
  -webkit-tap-highlight-color: transparent;
}

.da-iconbtn:hover {
  background: var(--da-bg-hover);
  color: var(--da-text-1);
}

.da-iconbtn:active {
  background: #e5e6eb;
}

.da-iconbtn.is-active {
  background: var(--da-primary-weak);
  color: var(--da-primary);
}

.da-iconbtn[disabled] {
  opacity: 0.4;
  cursor: not-allowed;
}

.da-iconbtn svg {
  width: 18px;
  height: 18px;
  display: block;
}

/* ---------- 面板主体（消息区 + 历史层叠放） ---------- */

.da-body {
  position: relative;
  flex: 1;
  min-height: 0;
  /* 不裁剪：左侧会话列表浮层需要溢出到面板外部展示；右侧历史滑层由 .da-chat 裁剪 */
  overflow: visible;
}

/* ---------- 消息列表 ---------- */

/* 左侧会话列表浮层：弹出在面板左侧外部的空白区域，不挤压聊天区 */
.da-chat {
  position: absolute;
  inset: 0;
  /* 裁剪右侧滑出的历史层，避免其在关闭状态露出面板外 */
  overflow: hidden;
}

.da-side {
  position: absolute;
  /* 与面板外边缘对齐（面板有 1px 边框，故向外多让 1px），右边缘紧贴面板左外缘 */
  left: -201px;
  top: -1px;
  bottom: -1px;
  width: 200px;
  z-index: 4;
  display: flex;
  flex-direction: column;
  background: #f7f8fa;
  border: 1px solid var(--da-border-light);
  /* 右侧与面板贴合：不要右边框、右侧直角，左侧保留与面板一致的外圆角 */
  border-right: none;
  border-radius: var(--da-radius-lg) 0 0 var(--da-radius-lg);
  /* 阴影只投向外侧（左/下），不投到面板上，避免贴合处出现重叠竖条 */
  box-shadow: -8px 12px 32px rgba(29, 33, 41, 0.12), -2px 0 8px rgba(29, 33, 41, 0.05);
  overflow: hidden;
}

.da-side__head {
  flex: none;
  height: 48px;
  padding: 0 8px 0 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--da-border-light);
}

.da-side__title {
  font-size: 13px;
  font-weight: 600;
  color: var(--da-text-2);
}

.da-side__list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 8px;
}

.da-side__list::-webkit-scrollbar {
  width: 6px;
}

.da-side__list::-webkit-scrollbar-thumb {
  background: rgba(134, 144, 156, 0.28);
  border-radius: 3px;
}

.da-side__item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: var(--da-radius-sm);
  cursor: pointer;
  color: var(--da-text-1);
  transition: background 0.15s ease;
}

.da-side__item:hover {
  background: var(--da-bg-hover);
}

.da-side__item.is-active {
  background: var(--da-primary-weak);
  color: var(--da-primary);
}

.da-side__item.is-active .da-side__text {
  font-weight: 500;
}

.da-side__dot {
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--da-text-4);
}

.da-side__item.is-active .da-side__dot {
  background: var(--da-primary);
}

.da-side__text {
  flex: 1;
  min-width: 0;
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.da-side__btn {
  flex: none;
  display: none;
  border: none;
  background: transparent;
  padding: 2px;
  color: var(--da-text-4);
  cursor: pointer;
  line-height: 0;
}

.da-side__item:hover .da-side__btn {
  display: block;
}

.da-side__btn:hover {
  color: var(--da-primary);
}

.da-side__btn[data-da-del]:hover {
  color: var(--da-danger);
}

.da-side__edit {
  flex: 1;
  min-width: 0;
  height: 26px;
  padding: 0 6px;
  border: 1px solid var(--da-primary);
  border-radius: 4px;
  background: var(--da-bg-panel);
  color: var(--da-text-1);
  font-size: 13px;
  font-family: var(--da-font);
  outline: none;
}

.da-side__empty {
  padding: 24px 10px;
  text-align: center;
  font-size: 12px;
  line-height: 1.8;
  color: var(--da-text-4);
}

@media (max-width: 768px) {
  .da-side {
    display: none;
  }
}

/* 顶部按钮收起左侧会话列表（列表为浮层，收起仅隐藏自身，聊天区宽度不变） */
.da-panel.is-side-collapsed .da-side {
  display: none;
}

/* 屏幕较窄、面板左侧放不下浮层时，退回面板内侧展示（面板恢复裁剪，列表不戳出圆角） */
@media (max-width: 960px) {
  .da-panel {
    overflow: hidden;
  }
  .da-side {
    left: 0;
    top: 0;
    bottom: 0;
    border: none;
    border-right: 1px solid var(--da-border-light);
    border-radius: 0;
    box-shadow: 8px 0 24px rgba(29, 33, 41, 0.06);
  }
}

/* 宽屏且会话列表展开时：面板左侧两角变直角，与外侧会话列表拼成一个完整圆角矩形，贴合处无缝、不重叠 */
@media (min-width: 961px) {
  .da-panel:not(.is-side-collapsed) {
    border-radius: 0 var(--da-radius-lg) var(--da-radius-lg) 0;
  }
  .da-panel:not(.is-side-collapsed) .da-header {
    border-radius: 0 var(--da-radius-lg) 0 0;
  }
  .da-panel:not(.is-side-collapsed) .da-composer {
    border-radius: 0 0 var(--da-radius-lg) 0;
  }
}

.da-messages {
  position: absolute;
  inset: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 16px 16px 8px;
  scroll-behavior: smooth;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

.da-messages::-webkit-scrollbar {
  width: 6px;
}

.da-messages::-webkit-scrollbar-thumb {
  background: rgba(134, 144, 156, 0.28);
  border-radius: 3px;
}

.da-messages::-webkit-scrollbar-thumb:hover {
  background: rgba(134, 144, 156, 0.5);
}

.da-messages::-webkit-scrollbar-track {
  background: transparent;
}

/* 时间分割线 */
.da-divider {
  margin: 4px 0 16px;
  text-align: center;
  font-size: 12px;
  color: var(--da-text-4);
}

.da-divider span {
  padding: 2px 10px;
  border-radius: 10px;
  background: var(--da-bg-hover);
}

/* 消息行 */
.da-msg {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  animation: da-fade-up 0.24s ease both;
}

@keyframes da-fade-up {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.da-msg--user {
  flex-direction: row-reverse;
}

.da-msg__avatar {
  flex: none;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--da-primary-weak);
  display: flex;
  align-items: center;
  justify-content: center;
}

.da-msg__avatar img,
.da-msg__avatar svg {
  width: 100%;
  height: 100%;
  display: block;
}

.da-msg--user .da-msg__avatar {
  background: var(--da-primary);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
}

.da-msg__main {
  min-width: 0;
  max-width: calc(100% - 40px);
}

.da-msg--user .da-msg__main {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.da-bubble {
  padding: 10px 14px;
  border-radius: 4px 12px 12px 12px;
  background: var(--da-bg-bubble-assistant);
  color: var(--da-text-1);
  word-break: break-word;
  overflow-wrap: anywhere;
}

.da-msg--user .da-bubble {
  background: var(--da-primary);
  color: #fff;
  border-radius: 12px 4px 12px 12px;
}

.da-bubble.is-error {
  background: var(--da-danger-weak);
  color: #a1151b;
}

/* 消息正文排版 */
.da-md > *:first-child {
  margin-top: 0;
}
.da-md > *:last-child {
  margin-bottom: 0;
}
.da-md p {
  margin: 0 0 8px;
  white-space: pre-wrap;
}
.da-md ul,
.da-md ol {
  margin: 0 0 8px;
  padding-left: 20px;
}
.da-md li {
  margin-bottom: 4px;
}
.da-md a {
  color: var(--da-primary);
  text-decoration: none;
}
.da-md a:hover {
  text-decoration: underline;
}
.da-msg--user .da-md a {
  color: #fff;
  text-decoration: underline;
}
.da-md strong {
  font-weight: 600;
}
.da-md h3,
.da-md h4 {
  margin: 12px 0 6px;
  font-size: 14px;
  font-weight: 600;
}
.da-md code {
  padding: 1px 5px;
  border-radius: 4px;
  background: rgba(29, 33, 41, 0.07);
  font-family: var(--da-font-mono);
  font-size: 12.5px;
}
.da-msg--user .da-md code {
  background: rgba(255, 255, 255, 0.2);
}
.da-md table {
  width: 100%;
  margin: 0 0 8px;
  border-collapse: collapse;
  font-size: 13px;
}

/* 表格外层允许横向滚动，窄面板/移动端不撑破气泡 */
.da-table-wrap {
  max-width: 100%;
  overflow-x: auto;
  margin: 8px 0;
  border-radius: var(--da-radius);
  border: 1px solid var(--da-border-light);
}

.da-table-wrap table {
  margin: 0;
  min-width: 100%;
}

.da-md th,
.da-md td {
  padding: 7px 10px;
  border-bottom: 1px solid var(--da-border-light);
  text-align: left;
  white-space: nowrap;
}

.da-md th {
  background: var(--da-bg-hover);
  font-weight: 600;
}

.da-md tr:last-child td {
  border-bottom: none;
}

/* 代码块：父级给 max-width，内部独立横向滚动，避免撑破气泡 */
.da-code {
  position: relative;
  margin: 8px 0;
  border-radius: var(--da-radius);
  background: var(--da-bg-code);
  border: 1px solid var(--da-border-light);
  overflow: hidden;
}

.da-code__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 6px 4px 12px;
  border-bottom: 1px solid var(--da-border-light);
  background: rgba(29, 33, 41, 0.02);
}

.da-code__lang {
  font-size: 11px;
  color: var(--da-text-3);
  letter-spacing: 0.4px;
  text-transform: uppercase;
}

.da-code__copy {
  border: none;
  background: transparent;
  color: var(--da-text-3);
  font-size: 12px;
  padding: 3px 8px;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--da-font);
  transition: background 0.15s ease, color 0.15s ease;
}

.da-code__copy:hover {
  background: var(--da-bg-hover);
  color: var(--da-text-1);
}

.da-code__copy.is-done {
  color: var(--da-success);
}

.da-code pre {
  margin: 0;
  padding: 12px;
  overflow-x: auto;
  max-width: 100%;
}

.da-code pre code {
  padding: 0;
  background: none;
  font-family: var(--da-font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: #1d2129;
  white-space: pre;
}

/* 参考文档来源 */
.da-refs {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed var(--da-border);
}

.da-refs__label {
  font-size: 12px;
  color: var(--da-text-3);
  margin-bottom: 4px;
}

.da-refs__item {
  display: block;
  font-size: 13px;
  color: var(--da-primary);
  text-decoration: none;
  padding: 2px 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.da-refs__item:hover {
  text-decoration: underline;
}

/* 消息操作条（复制 / 重新生成） */
.da-msg__actions {
  margin-top: 6px;
  display: flex;
  gap: 2px;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.da-msg:hover .da-msg__actions {
  opacity: 1;
}

.da-msg__actions button {
  border: none;
  background: transparent;
  color: var(--da-text-4);
  font-size: 12px;
  font-family: var(--da-font);
  padding: 2px 8px;
  border-radius: 4px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.da-msg__actions button:hover {
  background: var(--da-bg-hover);
  color: var(--da-text-2);
}

/* 思考中 / 光标 */
.da-typing {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 22px;
}

.da-typing i {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--da-text-4);
  animation: da-blink 1.2s infinite ease-in-out;
}

.da-typing i:nth-child(2) {
  animation-delay: 0.18s;
}
.da-typing i:nth-child(3) {
  animation-delay: 0.36s;
}

@keyframes da-blink {
  0%,
  60%,
  100% {
    opacity: 0.25;
    transform: translateY(0);
  }
  30% {
    opacity: 1;
    transform: translateY(-3px);
  }
}

.da-caret {
  display: inline-block;
  width: 2px;
  height: 15px;
  margin-left: 2px;
  vertical-align: -2px;
  background: var(--da-primary);
  animation: da-caret 1s step-end infinite;
}

@keyframes da-caret {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0;
  }
}

/* ---------- 欢迎态 ---------- */

.da-welcome {
  padding: 24px 4px 8px;
}

.da-welcome__title {
  font-size: 17px;
  font-weight: 600;
  color: var(--da-text-1);
  margin: 0;
  line-height: 1.45;
}

/* 未登录提示条：内嵌“去登录”链接 */
.da-guest {
  margin-top: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: var(--da-radius);
  background: var(--da-primary-weak);
  border: 1px solid rgba(22, 93, 255, 0.18);
  color: var(--da-text-2);
  font-size: 13px;
  line-height: 1.6;
}

.da-guest__icon {
  flex: none;
  width: 18px;
  height: 18px;
  color: var(--da-primary);
}

.da-guest__text {
  flex: 1;
  min-width: 0;
}

.da-guest__link {
  color: var(--da-primary);
  font-weight: 500;
  text-decoration: none;
  margin-left: 2px;
  cursor: pointer;
}

.da-guest__link:hover {
  color: var(--da-primary-hover);
  text-decoration: underline;
}

/* ---------- 历史会话层 ---------- */

.da-history {
  position: absolute;
  inset: 0;
  z-index: 3;
  display: flex;
  flex-direction: column;
  background: var(--da-bg-panel);
  transform: translateX(100%);
  transition: transform 0.24s cubic-bezier(0.34, 1.2, 0.64, 1);
}

.da-history.is-open {
  transform: translateX(0);
}

.da-history__head {
  flex: none;
  height: 48px;
  padding: 0 8px 0 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid var(--da-border-light);
}

.da-history__head h4 {
  margin: 0;
  flex: 1;
  font-size: 14px;
  font-weight: 600;
  color: var(--da-text-1);
}

.da-history__list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 8px;
}

.da-history__list::-webkit-scrollbar {
  width: 6px;
}

.da-history__list::-webkit-scrollbar-thumb {
  background: rgba(134, 144, 156, 0.28);
  border-radius: 3px;
}

.da-hgroup {
  padding: 12px 8px 6px;
  font-size: 12px;
  color: var(--da-text-4);
}

.da-hitem {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 10px;
  border-radius: var(--da-radius-sm);
  cursor: pointer;
  transition: background 0.15s ease;
}

.da-hitem:hover {
  background: var(--da-bg-hover);
}

.da-hitem.is-current {
  background: var(--da-primary-weak);
}

.da-hitem__icon {
  flex: none;
  width: 16px;
  height: 16px;
  color: var(--da-text-3);
}

.da-hitem.is-current .da-hitem__icon {
  color: var(--da-primary);
}

.da-hitem__text {
  flex: 1;
  min-width: 0;
}

.da-hitem__title {
  font-size: 13px;
  color: var(--da-text-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.da-hitem__meta {
  font-size: 11px;
  color: var(--da-text-4);
  margin-top: 1px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.da-hitem__del {
  flex: none;
  width: 24px;
  height: 24px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--da-text-4);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
}

.da-hitem:hover .da-hitem__del {
  display: flex;
}

.da-hitem__del:hover {
  background: var(--da-danger-weak);
  color: var(--da-danger);
}

.da-hitem__del svg {
  width: 14px;
  height: 14px;
}

.da-empty {
  padding: 56px 16px;
  text-align: center;
  color: var(--da-text-4);
  font-size: 13px;
}

.da-empty svg {
  width: 40px;
  height: 40px;
  opacity: 0.5;
  margin-bottom: 10px;
}

.da-history__foot {
  flex: none;
  padding: 8px 16px;
  border-top: 1px solid var(--da-border-light);
  font-size: 12px;
  color: var(--da-text-4);
}

/* ---------- 输入区 ---------- */

.da-composer {
  flex: none;
  padding: 10px 12px 12px;
  border-top: 1px solid var(--da-border-light);
  background: var(--da-bg-panel);
}

.da-composer__box {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 8px 8px 8px 12px;
  border: 1px solid var(--da-border);
  border-radius: var(--da-radius);
  background: var(--da-bg-page);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.da-composer__box:focus-within {
  border-color: var(--da-primary);
  box-shadow: 0 0 0 3px rgba(22, 93, 255, 0.1);
}

.da-composer textarea {
  flex: 1;
  min-width: 0;
  max-height: 120px;
  min-height: 24px;
  padding: 0;
  border: none;
  outline: none;
  resize: none;
  background: transparent;
  color: var(--da-text-1);
  font-family: var(--da-font);
  font-size: 14px;
  line-height: 24px;
  overflow-y: auto;
}

.da-composer textarea::placeholder {
  color: var(--da-text-4);
}

.da-send {
  flex: none;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: var(--da-radius-sm);
  background: var(--da-primary);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, opacity 0.15s ease;
}

.da-send:hover {
  background: var(--da-primary-hover);
}

.da-send:active {
  background: var(--da-primary-active);
}

.da-send[disabled] {
  background: var(--da-bg-hover);
  color: var(--da-text-4);
  cursor: not-allowed;
}

.da-send svg {
  width: 16px;
  height: 16px;
}

.da-composer__hint {
  margin-top: 6px;
  font-size: 11px;
  color: var(--da-text-4);
  text-align: center;
}

.da-composer__hint b {
  font-weight: 500;
}

/* ---------- Toast ---------- */

.da-toast {
  position: absolute;
  left: 50%;
  bottom: 76px;
  transform: translateX(-50%) translateY(8px);
  z-index: 9;
  max-width: 80%;
  padding: 7px 14px;
  border-radius: 16px;
  background: rgba(29, 33, 41, 0.9);
  color: #fff;
  font-size: 12.5px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.da-toast.is-show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ============================ 移动端 ============================ */

@media (max-width: 640px) {
  .da-launcher {
    right: 16px;
    bottom: 16px;
  }

  .da-panel {
    right: 0;
    bottom: 0;
    width: 100vw;
    height: 100vh;
    min-height: 0;
    max-height: none;
    border: none;
    border-radius: 0;
    transform: translateY(24px);
  }

  .da-panel.is-open {
    transform: translateY(0);
  }

  .da-composer {
    padding-bottom: calc(12px + env(safe-area-inset-bottom));
  }
}

/* ============================ 无障碍 / 降级 ============================ */

@media (prefers-reduced-motion: reduce) {
  .da-panel,
  .da-launcher,
  .da-history,
  .da-msg,
  .da-toast {
    animation: none !important;
    transition: none !important;
  }
}

.da-launcher:focus-visible,
.da-iconbtn:focus-visible,
.da-send:focus-visible,
.da-suggest__item:focus-visible {
  outline: 2px solid var(--da-primary);
  outline-offset: 2px;
}