/* ============================================================================
   问答对话 v2 —— 会话化重设计
   覆盖 style.css / theme-wmu.css 里旧的聊天气泡样式；只增不改其他板块。
   设计目标：像「一次真正的对话」——头像与气泡、每条回答可复制/重生成、
   教材证据默认折叠不打断阅读、追问衔接上文、长回答滚动不拽人、贴图上灯箱。
   仅使用两套主题都存在的令牌（--primary/--bg-inset/…），明暗色都成立。
   ============================================================================ */

/* ---------- 外壳：会话工具条 + 相对定位锚（回到底部浮钮） ---------- */
#panel-ask .chat-wrap { position: relative; }

.chat-bar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 10px 16px; border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, color-mix(in srgb, var(--primary) 5%, var(--bg-card)), var(--bg-card));
}
.chat-bar-id { display: flex; align-items: center; gap: 10px; min-width: 0; }
.chat-bar-name { display: flex; flex-direction: column; line-height: 1.3; min-width: 0; }
.chat-bar-name b { font-size: 14.5px; color: var(--text); }
.chat-bar-name small { font-size: 11.8px; color: var(--text-muted); }
.chat-bar-tools { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.chat-book {
  max-width: 220px; padding: 7px 10px; font-size: 13px;
  border: 1px solid var(--border-strong); border-radius: 10px;
  background: var(--bg-card); color: var(--text-soft);
}
.chat-tool {
  border: 1px solid var(--border-strong); background: var(--bg-card); color: var(--text-soft);
  font-size: 12.8px; padding: 7px 12px; border-radius: 10px; cursor: pointer;
  transition: all var(--tr); white-space: nowrap;
}
.chat-tool:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }

/* ---------- 头像 ---------- */
.chat-avatar {
  width: 30px; height: 30px; border-radius: 10px; flex: none;
  display: grid; place-items: center; font-size: 13.5px; font-weight: 700; color: #fff;
  background: linear-gradient(140deg, var(--primary), var(--primary-dark));
  box-shadow: 0 4px 10px -4px color-mix(in srgb, var(--primary) 65%, transparent);
}
.chat-avatar--ai { border-radius: 50%; }
.chat-avatar--me { background: linear-gradient(140deg, var(--accent), var(--primary-dark)); border-radius: 50%; }

/* ---------- 空状态：欢迎卡 + 示例问题 ---------- */
.chat-welcome {
  margin: auto; max-width: 560px; text-align: center;
  display: flex; flex-direction: column; gap: 10px; align-items: center;
  padding: 26px 18px; animation: cv2-in .3s ease;
}
.chat-welcome-ic {
  width: 58px; height: 58px; border-radius: 20px; display: grid; place-items: center;
  font-size: 26px; background: var(--primary-soft);
  border: 1px solid var(--primary-line);
  box-shadow: 0 12px 28px -16px color-mix(in srgb, var(--primary) 55%, transparent);
}
.chat-welcome h3 { font-size: 18px; color: var(--text); }
.chat-welcome p { font-size: 13.2px; color: var(--text-muted); line-height: 1.75; }
.chat-samples { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 6px; }
.chat-sample {
  border: 1px solid var(--border-strong); background: var(--bg-card); color: var(--text-soft);
  font-size: 12.8px; padding: 7px 13px; border-radius: 999px; cursor: pointer;
  transition: all var(--tr);
}
.chat-sample:hover {
  border-color: var(--primary); color: var(--primary); background: var(--primary-soft);
  transform: translateY(-1px);
}

/* ---------- 消息行：头像 + 主体（气泡 + 操作栏） ---------- */
/* 旧主题把背景画在 .msg-user/.msg-assistant「整行」上；v2 的行是
   「头像 + 主体」的 flex 容器，气泡背景必须下沉到 .msg-body，
   所以在这里把行级装饰清空（选择器带 #panel-ask 前缀，稳定压过 theme-wmu）。 */
#panel-ask .msg.msg-user,
#panel-ask .msg.msg-assistant {
  background: none; border: none; color: inherit; box-shadow: none;
  border-radius: 0; padding: 0;
}
#panel-ask .chat-log { gap: 18px; scroll-behavior: smooth; }
#panel-ask .msg {
  display: flex; align-items: flex-start; gap: 10px;
  max-width: min(92%, 760px); flex-direction: row;
  animation: cv2-in .24s ease;
}
@keyframes cv2-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
#panel-ask .msg-user { align-self: flex-end; flex-direction: row-reverse; }
#panel-ask .msg-assistant { align-self: flex-start; }
.msg-main { display: flex; flex-direction: column; gap: 5px; min-width: 0; }
#panel-ask .msg-user .msg-main { align-items: flex-end; }

#panel-ask .msg-body {
  padding: 11px 15px; border-radius: 16px;
  font-size: 14.8px; line-height: 1.8; white-space: pre-wrap; word-break: break-word;
}
#panel-ask .msg-assistant .msg-body {
  background: var(--bg-card); border: 1px solid var(--border);
  border-top-left-radius: 6px; box-shadow: var(--shadow-sm);
  color: var(--text);
}
#panel-ask .msg-user .msg-body {
  background: linear-gradient(140deg, var(--primary), var(--primary-dark)); color: #fff;
  border-top-right-radius: 6px;
  box-shadow: 0 8px 18px -12px color-mix(in srgb, var(--primary) 80%, transparent);
}
#panel-ask .msg-time { font-size: 11px; color: var(--text-muted); padding: 0 4px; }
#panel-ask .msg-user .msg-time { text-align: right; }

/* 操作栏：默认隐藏悬停出现；触屏（无 hover）常驻，避免功能不可发现 */
.msg-actions { display: flex; gap: 4px; opacity: 0; transition: opacity var(--tr); }
#panel-ask .msg:hover .msg-actions,
#panel-ask .msg:focus-within .msg-actions { opacity: 1; }
@media (hover: none) { .msg-actions { opacity: 1; } }
.msg-act {
  border: 1px solid transparent; background: transparent; color: var(--text-muted);
  font-size: 11.8px; padding: 3px 9px; border-radius: 999px; cursor: pointer;
  transition: all var(--tr); white-space: nowrap;
}
.msg-act:hover { color: var(--primary); border-color: var(--primary-line); background: var(--primary-soft); }
.msg-act.is-done { color: var(--ok); }

/* 配图（用户气泡内） */
#panel-ask .msg-images { margin-top: 8px; }
#panel-ask .msg-images img { cursor: zoom-in; transition: transform var(--tr); }
#panel-ask .msg-images img:hover { transform: scale(1.02); }

/* 等待态：阶段文案 + 计时点 */
#panel-ask .msg.thinking { opacity: .95; }
#panel-ask .thinking-line { display: flex; align-items: center; gap: 9px; color: var(--text-muted); font-size: 13.5px; }
#panel-ask .thinking-bar {
  width: 92px; height: 4px; border-radius: 999px; overflow: hidden;
  background: color-mix(in srgb, var(--primary) 14%, transparent);
}
#panel-ask .thinking-bar::after {
  content: ""; display: block; width: 40%; height: 100%; border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  animation: cv2-run 1.15s ease-in-out infinite alternate;
}
@keyframes cv2-run { from { transform: translateX(0); } to { transform: translateX(150%); } }
#panel-ask .thinking-stage::after {
  content: ""; display: inline-block; width: 1.1em; text-align: left;
  animation: dots 1.4s steps(4, end) infinite;
}

/* ---------- 证据折叠：不打断阅读，想看再展开 ---------- */
.evidence-fold { margin-top: 10px; white-space: normal; }
.evidence-fold > summary {
  cursor: pointer; list-style: none; user-select: none;
  display: flex; align-items: center; gap: 8px;
  font-size: 12.6px; font-weight: 600; color: var(--text-muted);
  border: 1px dashed var(--border-strong); border-radius: 10px;
  padding: 7px 11px; background: var(--bg-inset); transition: all var(--tr);
}
.evidence-fold > summary:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-soft); }
.evidence-fold > summary::-webkit-details-marker { display: none; }
.evidence-fold > summary::before { content: "▸"; transition: transform var(--tr); font-size: 11px; }
.evidence-fold[open] > summary::before { transform: rotate(90deg); }
.evidence-fold[open] > summary { border-style: solid; }
.evidence-count { margin-left: auto; font-weight: 400; opacity: .85; }
#panel-ask .evidence-block, .evidence-fold .evidence-block {
  margin-top: 8px; padding: 4px 12px 8px;
  background: var(--bg-inset); border: 1px solid var(--border); border-radius: 12px;
}
.evidence-fold .evidence-item {
  padding: 10px 2px; border-top: 1px solid var(--border); font-size: 13.2px;
  line-height: 1.7; color: var(--text-soft);
}
.evidence-fold .evidence-item:first-child { border-top: none; }
.ev-ref {
  display: inline-flex; align-items: center; gap: 6px; flex-wrap: wrap;
  font-size: 12.2px; margin-bottom: 3px;
}
.ev-ref b { color: var(--primary); background: var(--primary-soft); border: 1px solid var(--primary-line);
  border-radius: 7px; padding: 1px 8px; font-weight: 600; }
.ev-ref .ev-page { color: var(--text-muted); }
.ev-ref .ev-section { color: var(--text-muted); border-left: 1px solid var(--border-strong); padding-left: 8px; }

/* 非折叠场景（名词解释/历史弹窗）沿用旧结构：保证样式一致 */
#termResults .evidence-block { margin: 16px auto 0; max-width: 900px; white-space: normal;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 13px 15px; }
#termResults .evidence-item { border-top: 1px solid var(--border); padding: 9px 0; font-size: 13.2px; color: var(--text-soft); line-height: 1.7; }
#termResults .evidence-item:first-of-type { border-top: none; }
#termResults .evidence-item b { color: var(--primary); }

/* 回答内的提示条（跨教材补充 / 截断说明 / 限定说明） */
#panel-ask .msg-note {
  margin-top: 10px; font-size: 12.2px; padding: 6px 11px;
  background: var(--primary-soft); border-left: 3px solid var(--primary-line);
  border-radius: 0 10px 10px 0; color: var(--text-muted); white-space: normal;
}

/* ---------- 回到底部浮钮 ---------- */
.chat-tobottom {
  position: absolute; left: 50%; transform: translateX(-50%);
  bottom: calc(100% - 46px); z-index: 5;
  border: 1px solid var(--border-strong); background: var(--bg-card); color: var(--text-soft);
  font-size: 12.5px; padding: 6px 14px; border-radius: 999px; cursor: pointer;
  box-shadow: var(--shadow); transition: all var(--tr); animation: cv2-in .2s ease;
}
.chat-tobottom:hover { color: var(--primary); border-color: var(--primary); }

/* ---------- 输入区（composer） ---------- */
#panel-ask .ask-box {
  border-top: 1px solid var(--border); background: var(--bg-card);
  padding: 10px 14px 12px; display: block;
}
.ask-row { display: flex; align-items: flex-end; gap: 9px; }
#panel-ask .ask-box textarea {
  flex: 1; resize: none; border: 1px solid var(--border-strong); background: var(--bg-inset);
  color: var(--text); border-radius: 14px; padding: 10px 14px; font-size: 14.5px;
  line-height: 1.6; max-height: 168px; transition: all var(--tr);
}
#panel-ask .ask-box textarea:focus { border-color: var(--primary); background: var(--bg-card); box-shadow: var(--ring); }
.ask-attach { align-self: flex-end; }
.ask-send { display: inline-flex; align-items: center; gap: 6px; white-space: nowrap; border-radius: 14px; padding: 10px 18px; }
.ask-send-kbd { opacity: .8; font-weight: 400; }
.ask-hint { margin: 6px 2px 0; font-size: 11.6px; color: var(--text-muted); }
#askImages { border-top: none; padding: 10px 14px 0; }

/* ---------- 图片灯箱 ---------- */
.lightbox {
  position: fixed; inset: 0; z-index: 300; display: grid; place-items: center;
  background: rgba(10, 6, 8, .78); backdrop-filter: blur(3px);
  animation: cv2-in .18s ease;
}
.lightbox[hidden] { display: none; }
.lightbox img {
  max-width: min(92vw, 1100px); max-height: 88vh; border-radius: 12px;
  box-shadow: 0 30px 80px -20px rgba(0, 0, 0, .6); background: #fff; cursor: zoom-out;
}
.lightbox-close {
  position: absolute; top: 18px; right: 22px; width: 38px; height: 38px;
  border-radius: 50%; border: 1px solid rgba(255, 255, 255, .4);
  background: rgba(20, 10, 14, .5); color: #fff; font-size: 16px; cursor: pointer;
}

/* ---------- 移动端收紧 ---------- */
@media (max-width: 720px) {
  .chat-bar { padding: 8px 12px; gap: 8px; }
  .chat-bar-name small { display: none; }
  .chat-book { max-width: 132px; }
  #panel-ask .msg { max-width: 94%; }
  .chat-avatar { width: 26px; height: 26px; font-size: 12px; }
  #panel-ask .msg-body { padding: 10px 13px; font-size: 14.5px; }
  .ask-hint { display: none; }
  .chat-welcome { padding: 14px 6px; }
  .chat-welcome-ic { width: 48px; height: 48px; font-size: 22px; }
}

/* ---------- 深色模式微调（暖红主题下气泡对比已够，这里只压阴影） ---------- */
@media (prefers-color-scheme: dark) {
  .chat-bar { background: linear-gradient(180deg, color-mix(in srgb, var(--primary) 9%, var(--bg-card)), var(--bg-card)); }
  #panel-ask .msg-assistant .msg-body { box-shadow: none; }
  .chat-avatar { color: #241318; background: linear-gradient(140deg, var(--primary), var(--primary-dark)); }
}

/* ---------- 打印：只留正文与证据 ---------- */
@media print {
  .chat-bar, .chat-tobottom, .msg-actions, .ask-box, .ask-images, .lightbox { display: none !important; }
}