/* ============================================================
   AI 中心 · 居中 Hero + 模式胶囊 + 功能条 + 大圆角毛玻璃输入卡
   + 对话气泡流 + 文档流底部输入坞 + 历史/收藏侧滑面板
   默认无图片背景，跟随「设置 · 主题皮肤」的界面风格（--color-background）
   ============================================================ */

/* 页面骨架：铺满视口（修掉 app-content 自带的 64px 底部留白） */
.aic-body .app-pagehead { display: none; }
/* 视口高度链必须从 .app-frame 钉死：它只有 min-height 时子项的 flex-basis:0%
   解析失败退化成 content sizing，消息区不再内滚、整页文档滚动，内容滑进输入坞底下 */
.aic-body .app-frame { height: 100dvh; overflow: hidden; }
.aic-body .app-content {
  flex: 1; display: flex; flex-direction: column; min-height: 0;
  padding: 0;
}
.aic-body .app-main { display: flex; flex-direction: column; min-height: 0; flex: 1; }
.aic-wrap {
  flex: 1; display: flex; flex-direction: column; min-height: 0; width: 100%;
  padding: 0;
  background: var(--color-background);
}
/* 图片背景主题（设置里切换）：固定全视口 ::before 层铺满，壁纸不再被外层容器留白裁掉。
   实测（2026-10-31）：画在 .aic-wrap 盒子上会受外层 1200/1400 车道约束，左右露白边。 */
.aic-wrap[data-bg] { background: transparent; }
.aic-wrap[data-bg] #aiApp { position: relative; z-index: 1; }
.aic-wrap[data-bg="sunset-geese"]::before,
.aic-wrap[data-bg="moonlit-pines"]::before,
.aic-wrap[data-bg="red-plum"]::before,
.aic-wrap[data-bg="celestial-palace"]::before {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-size: cover; background-position: center; background-repeat: no-repeat;
}
.aic-wrap[data-bg="sunset-geese"]::before { background-image: url(/images/ai-center-backgrounds/sunset-geese.jpg?v=9b08ee7e); }
.aic-wrap[data-bg="moonlit-pines"]::before { background-image: url(/images/ai-center-backgrounds/moonlit-pines.jpg?v=00c7f1b1); }
.aic-wrap[data-bg="red-plum"]::before { background-image: url(/images/ai-center-backgrounds/red-plum.jpg?v=a3a7ca85); }
.aic-wrap[data-bg="celestial-palace"]::before { background-image: url(/images/ai-center-backgrounds/celestial-palace.jpg?v=d1955b59); }
#aiApp { flex: 1; display: flex; flex-direction: column; min-height: 0; background: transparent; }

/* ---------- 顶部操作行（原版顶栏右侧按钮组；宽度对齐全站正文 1200px） ---------- */
.aic-toprow {
  display: flex; justify-content: flex-end; gap: 8px;
  width: 100%; max-width: var(--width-content); margin: 0 auto;
  padding: 12px 28px 0; flex-shrink: 0;
}
.aic-pill {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--color-secondary); background: #fff; color: #374151;
  padding: 7px 14px; font: inherit; font-size: 13px; font-weight: 500;
  border-radius: 6px; box-shadow: 0 1px 2px rgba(15, 23, 42, 0.06); cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.aic-pill:hover { background: var(--color-error-soft); color: var(--color-primary-active); border-color: #fecaca; }
.aic-pill svg { flex-shrink: 0; }
.aic-points-bal {
  margin-right: auto;
  align-self: center;
  font-size: 13px;
  color: var(--color-text-secondary, #6b5250);
  white-space: nowrap;
}
.aic-points-bal.is-vip { color: var(--color-primary, var(--color-primary)); }
.aic-msg-cost {
  margin-top: 6px;
  font-size: 12px;
  color: var(--color-text-tertiary, #a38b86);
  line-height: 1.5;
}

/* ---------- 模式切换胶囊（AI备课 / 作业批改） ---------- */
.aic-seg {
  display: inline-flex; align-items: center; gap: 4px; padding: 4px;
  background: rgba(255, 255, 255, 0.55); border-radius: 6px;
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.08);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.aic-seg button {
  box-sizing: border-box; min-width: 6.6em; text-align: center;
  border: 0; background: transparent; font: inherit; font-size: 15px; font-weight: 600;
  color: #475569; padding: 8px 18px; border-radius: 6px; cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.aic-seg button:hover { background: rgba(255, 255, 255, 0.7); color: var(--color-primary-active); }
.aic-seg button.on {
  background: var(--color-primary, var(--color-primary));
  color: var(--color-primary-foreground, #fff);
  box-shadow: none;
}
.aic-seg button.on:hover { background: var(--color-primary-hover, var(--color-primary-hover)); color: #fff; }
.aic-seg.compact button { padding: 6px 16px; font-size: 14px; }
.aic-compact { display: flex; justify-content: center; padding: 10px 0 2px; flex-shrink: 0; }

/* ---------- 落地 Hero ---------- */
.aic-hero {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  padding: 7vh 16px 40px; overflow-y: auto; min-height: 0;
}
.aic-hero-title {
  margin: 10px 0 14px; font-size: 34px; font-weight: 700; color: var(--color-text-primary);
  letter-spacing: 0.5px; text-align: center;
}
.aic-hero-input { width: 100%; max-width: 820px; margin-top: 26px; }

/* ---------- 空会话示例问题：轻量文字按钮，点击即发送，填补 hero 留白 ---------- */
.aic-hero-samples {
  display: flex; flex-wrap: wrap; justify-content: center;
  gap: 8px; width: 100%; max-width: 820px; margin-top: 16px;
}
.aic-sample {
  border: 1px solid var(--color-border); border-radius: var(--radius-control);
  background: var(--color-surface); color: var(--color-text-secondary);
  font-size: 13px; padding: 6px 12px; cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background-color 0.15s ease;
}
.aic-sample:hover { border-color: var(--color-primary-border); color: var(--color-primary); background: var(--color-primary-soft); }

/* ---------- 功能按钮条（相连边框式，选中红字） ---------- */
.aic-feats {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: center;
  width: fit-content; max-width: 100%; margin: 0 auto 12px; overflow-x: auto;
}
.aic-feats button {
  display: inline-flex; align-items: center; gap: 6px; min-height: 32px;
  border: 1px solid rgba(226, 232, 240, 0.6); border-left-width: 0;
  background: transparent; padding: 6px 12px;
  font: inherit; font-size: 12px; font-weight: 600; color: #374151; cursor: pointer;
  transition: color 0.15s; white-space: nowrap;
}
.aic-feats button:first-child { border-left-width: 1px; }
.aic-feats button:hover { color: var(--color-primary-active); }
.aic-feats button.on { color: var(--color-primary-active); }
.aic-feats svg { flex-shrink: 0; }

/* 图谱类型小胶囊 */
.aic-chips { display: flex; justify-content: center; gap: 8px; margin-bottom: 10px; flex-wrap: wrap; }

/* 带课例模式：课例已带入小条 */
.aic-lesson { display: flex; justify-content: center; margin-bottom: 10px; }
.aic-lesson[hidden] { display: none; }
.aic-lesson-chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 4px 6px 4px 10px;
  border: 1px solid var(--border, rgba(155, 27, 46, .25));
  border-radius: 6px;
  font-size: 13px; line-height: 1.5;
  background: transparent;
}
.aic-lesson-chip b { font-weight: 600; color: var(--qb-accent, #9b1b2e); }
.aic-lesson-title { color: var(--text-secondary, #5b6472); max-width: 320px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.aic-lesson-act {
  border: 1px solid var(--border-strong, #d3d9e0); background: #fff; color: var(--text-primary, #232a33);
  border-radius: 6px; padding: 2px 8px; font-size: 12px; line-height: 1.6; cursor: pointer;
}
.aic-lesson-act:hover { border-color: var(--qb-accent, #9b1b2e); color: var(--qb-accent, #9b1b2e); }
.aic-chips button {
  border: 1px solid var(--color-secondary); background: rgba(255, 255, 255, 0.7); color: #475569;
  font: inherit; font-size: 12px; padding: 4px 12px; border-radius: 6px; cursor: pointer;
}
.aic-chips button.on { border-color: var(--color-primary); color: var(--color-primary); font-weight: 600; background: #fff; }

/* ---------- 大输入卡（24px 圆角 + 毛玻璃 + 聚焦红边） ---------- */
.aic-card {
  display: flex; flex-direction: column; border-radius: 8px;
  border: 2px solid var(--color-border-strong); background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.05);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.aic-card:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(254, 226, 226, 0.9), 0 4px 14px rgba(15, 23, 42, 0.06);
}
.aic-card textarea {
  display: block; width: 100%; border: 0; outline: none; resize: none;
  background: transparent; font: inherit; font-size: 15px; line-height: 1.7;
  color: #111827; padding: 14px 16px 4px; min-height: 56px; max-height: 200px;
}
.aic-card textarea::placeholder { color: var(--color-text-tertiary); }
.aic-input-foot { display: flex; align-items: center; justify-content: flex-end; gap: 12px; padding: 0 10px 10px 14px; }

/* 发送按钮：红色圆形 ↑；生成中变停止方块 */
.aic-send {
  flex-shrink: 0; width: 36px; height: 36px; border-radius: 8px; border: 0;
  background: var(--color-primary); color: #fff; cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background 0.15s, opacity 0.15s;
}
.aic-send:hover { background: var(--color-error); }
.aic-send:disabled { opacity: 0.4; cursor: not-allowed; }
.aic-send.stop { background: #111827; }
.aic-send.stop:hover { background: #1f2937; }
.aic-send.labeled { width: auto; border-radius: 6px; padding: 0 22px; font: inherit; font-size: 14px; font-weight: 600; }

/* ---------- 对话消息流 ---------- */
.aic-chat { flex: 1; display: flex; flex-direction: column; min-height: 0; }
/* 双列行：左对话 / 右教案文档；输入坞(#chatDock)在运行时移入 .aic-chat 末尾、保持全宽 */
.aic-chat-body { flex: 1; display: flex; flex-direction: row; align-items: stretch; min-width: 0; min-height: 0; }
.aic-chat-main { flex: 1; display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.aic-messages { flex: 1; overflow-y: auto; min-height: 0; padding: 12px 16px 24px; }

/* ---------- 右侧教案文档视图：左对话 / 右文档 ---------- */
.aic-doc {
  flex: 0 0 clamp(380px, 36vw, 560px);
  display: flex; flex-direction: column; min-width: 0; min-height: 0;
  border-left: 1px solid var(--color-border);
  background: var(--color-background, #faf7f0);
}
.aic-doc[hidden] { display: none; }
.aic-doc-head {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 16px; border-bottom: 1px solid var(--color-border);
  background: var(--color-surface, #fff); flex-shrink: 0;
}
.aic-doc-title { display: flex; align-items: baseline; gap: 10px; min-width: 0; }
.aic-doc-title b { font-size: 15px; color: var(--color-text-primary, #33302a); white-space: nowrap; flex-shrink: 0; }
.aic-doc-sub {
  font-size: 12px; color: var(--color-text-tertiary, #a08a5f);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0;
}
.aic-doc-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.aic-doc-actions button {
  border: 1px solid var(--color-border); background: var(--color-surface, #fff);
  color: var(--color-text-secondary, #5b6472); font-size: 13px; line-height: 1;
  padding: 6px 12px; border-radius: var(--radius-control, 6px); cursor: pointer;
}
.aic-doc-actions button:hover { color: var(--qb-accent, #9b1b2e); border-color: var(--qb-accent, #9b1b2e); }
.aic-doc-actions #docClose { font-size: 16px; padding: 4px 10px; }
.aic-doc-body { flex: 1; overflow-y: auto; min-height: 0; padding: 20px 22px 32px; }
.aic-doc-paper {
  background: var(--color-surface, #fff);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-overlay, 8px);
  box-shadow: 0 2px 10px rgba(120, 90, 30, 0.06);
  padding: 28px 30px 34px;
  max-width: 100%;
}
.aic-doc-wait { text-align: center; padding: 60px 20px; color: var(--color-text-tertiary, #a08a5f); }
.aic-doc-wait .aic-typing { justify-content: center; margin-bottom: 14px; }
.aic-doc-wait p { font-size: 14px; line-height: 1.7; }
@media (max-width: 1080px) {
  .aic-doc {
    position: fixed; top: 0; right: 0; bottom: 0; z-index: 80;
    width: min(92vw, 560px); flex: none;
    box-shadow: var(--shadow-overlay, -8px 0 30px rgba(0,0,0,.14));
  }
}
.aic-msg { display: flex; margin: 0 auto 18px; max-width: 860px; gap: 10px; }
.aic-msg.user { justify-content: flex-end; }
.aic-msg .aic-avatar {
  width: 32px; height: 32px; border-radius: 8px; overflow: hidden; flex-shrink: 0;
  border: 1.5px solid #fff; box-shadow: 0 2px 6px rgba(15, 23, 42, 0.1); margin-top: 2px;
}
.aic-msg .aic-avatar img { width: 100%; height: 100%; object-fit: cover; }
.aic-bubble { max-width: 78%; padding: 10px 16px; font-size: 15px; line-height: 1.7; overflow-wrap: anywhere; }
.aic-bubble.user {
  background: var(--color-primary);
  color: #fff; border: 1px solid rgba(150, 37, 48, 0.4);
  border-radius: 8px 8px 4px 8px;
  box-shadow: 0 1px 3px rgba(199, 53, 64, 0.15);
  white-space: pre-wrap;
}
.aic-bubble.ai {
  background: rgba(255, 252, 251, 0.95); color: #3d2c2c;
  border: 1px solid #edccc6; border-radius: 4px 8px 8px 8px;
  box-shadow: 0 1px 2px rgba(199, 53, 64, 0.05);
}
.aic-msg-actions { display: flex; gap: 4px; margin-top: 8px; padding-top: 6px; border-top: 1px dashed #f0dcd7; }
.aic-msg-actions button {
  border: 0; background: transparent; font: inherit; font-size: 12px; color: #a38b86;
  padding: 2px 8px; border-radius: 6px; cursor: pointer;
}
.aic-msg-actions button:hover { color: var(--color-primary); background: var(--color-error-soft); }

/* 生成中：三点跳动 */
.aic-typing { display: inline-flex; align-items: center; gap: 5px; padding: 4px 0; }
.aic-typing i {
  width: 6px; height: 6px; border-radius: 8px; background: var(--color-primary); opacity: 0.35;
  animation: aic-blink 1.2s infinite;
}
.aic-typing i:nth-child(2) { animation-delay: 0.2s; }
.aic-typing i:nth-child(3) { animation-delay: 0.4s; }
@keyframes aic-blink { 0%, 80%, 100% { opacity: 0.25; } 40% { opacity: 1; } }
.aic-typing .aic-typing-text { font-size: 13px; color: #a38b86; margin-left: 4px; }

/* ---------- 气泡内 Markdown ---------- */
.aic-md { font-size: 15px; line-height: 1.75; }
.aic-md h2, .aic-md h3, .aic-md h4, .aic-md h5 { font-weight: 600; margin: 16px 0 8px; line-height: 1.4; }
.aic-md h2 { font-size: 18px; } .aic-md h3 { font-size: 16px; }
.aic-md h4 { font-size: 15px; } .aic-md h5 { font-size: 14px; }
.aic-md p { margin: 0 0 10px; } .aic-md p:last-child { margin-bottom: 0; }
.aic-md ul, .aic-md ol { margin: 0 0 12px; padding-left: 22px; }
.aic-md li { margin: 0 0 4px; }
.aic-md code { padding: 1px 5px; border-radius: 4px; background: #f7f1ef; font-size: 13px; }
.aic-md pre { background: #f7f1ef; padding: 12px; border-radius: 8px; overflow-x: auto; margin: 0 0 12px; }
.aic-md pre code { background: transparent; padding: 0; }
.aic-md table { border-collapse: collapse; width: 100%; margin-bottom: 12px; display: block; overflow-x: auto; }
.aic-md th, .aic-md td { border: 1px solid #edccc6; padding: 6px 10px; text-align: left; font-size: 14px; }

/* ---------- 底部输入坞（对话视图文档流内的真实底栏：不悬浮、不遮内容） ---------- */
.aic-dock { flex-shrink: 0; padding: 6px 16px 14px; }
.aic-dock-inner { max-width: 860px; margin: 0 auto; }
.aic-dock .aic-feats { margin-bottom: 10px; }
.aic-dock .aic-feats button { background: rgba(255, 255, 255, 0.72); }
.aic-dock .aic-feats button:first-child { background: rgba(255, 255, 255, 0.72); }

/* ---------- 作业批改 ---------- */
.aic-grading { flex: 1; overflow-y: auto; min-height: 0; padding: 7vh 16px 40px; }
.aic-grading-inner { max-width: 860px; margin: 0 auto; }
#gradeHome { display: flex; flex-direction: column; align-items: center; }
.aic-grade-input { width: 100%; margin-top: 18px; }
.aic-grade-card {
  border-radius: 8px; border: 1px solid rgba(237, 204, 198, 0.9);
  background: rgba(255, 252, 251, 0.9); box-shadow: 0 4px 18px rgba(199, 53, 64, 0.06);
  padding: 22px 24px; margin-top: 12px;
  display: flex; flex-direction: column; gap: 14px;
}
.aic-field { display: flex; flex-direction: column; gap: 6px; font-size: 13px; font-weight: 600; color: #7a5c58; }
.aic-field textarea {
  font: inherit; font-weight: 400; font-size: 14px; line-height: 1.65; color: #3d2c2c;
  border: 1px solid #e7d5d0; border-radius: 8px; background: #fff;
  padding: 10px 12px; resize: vertical; min-height: 60px; outline: none;
}
.aic-field textarea:focus { border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(254, 226, 226, 0.8); }
.aic-grade-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.aic-num { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 600; color: #7a5c58; }
.aic-num input {
  width: 90px; height: 34px; border: 1px solid #e7d5d0; border-radius: 8px;
  background: #fff; font: inherit; font-size: 14px; padding: 0 10px; color: #3d2c2c; outline: none;
}
.aic-num input:focus { border-color: var(--color-primary); }
.aic-status { font-size: 13px; color: #a38b86; min-height: 18px; }
.aic-status:empty { display: none; }
.aic-grade-result { margin-top: 20px; }
.aic-grade-result:empty { display: none; }

/* 批改结果头部 */
.aic-grade-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 12px; }
.aic-score { font-size: 34px; font-weight: 700; color: var(--color-primary); line-height: 1; }
.aic-score i { font-size: 15px; font-style: normal; font-weight: 400; color: #a38b86; }
.aic-level {
  padding: 3px 12px; border: 1px solid #edccc6; border-radius: 6px;
  font-size: 13px; color: var(--color-primary-active); background: var(--color-error-soft);
}
.aic-points, .aic-missing { list-style: none; padding: 0; margin: 0 0 16px; }
.aic-points li { display: flex; align-items: baseline; gap: 8px; padding: 6px 0; border-bottom: 1px solid #f5e4e0; font-size: 14px; }
.aic-points li b { flex-shrink: 0; font-weight: 600; }
.aic-points li.hit { color: #3d2c2c; } .aic-points li.miss { color: #8c7370; }
.aic-missing li { padding: 4px 0; font-size: 14px; color: #8c7370; }
.aic-missing li::before { content: "· "; color: var(--color-primary); }

/* ---------- 历史 / 收藏 侧滑面板 ---------- */
.aic-overlay {
  position: fixed; inset: 0; background: rgba(15, 18, 25, 0.42);
  z-index: 900; display: flex; justify-content: flex-end;
}
.aic-panel {
  width: min(430px, 100vw); height: 100%; background: #fffdfb;
  box-shadow: -12px 0 40px rgba(15, 23, 42, 0.18);
  display: flex; flex-direction: column;
  animation: aic-slide-in 0.22s ease-out;
}
@keyframes aic-slide-in { from { transform: translateX(40px); opacity: 0.4; } to { transform: none; opacity: 1; } }
.aic-panel-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px 0; flex-shrink: 0;
}
.aic-panel-tabs { display: flex; gap: 20px; }
.aic-panel-tabs button {
  border: 0; background: none; font: inherit; font-size: 15px; color: #8c7370;
  padding: 6px 2px 10px; cursor: pointer; border-bottom: 2px solid transparent;
}
.aic-panel-tabs button.on { color: var(--color-primary); border-bottom-color: var(--color-primary); font-weight: 600; }
.aic-x { border: 0; background: transparent; font-size: 22px; color: #a38b86; cursor: pointer; line-height: 1; padding: 4px 8px; }
.aic-x:hover { color: var(--color-primary); }
.aic-panel-body { flex: 1; overflow-y: auto; padding: 12px 20px 24px; min-height: 0; }

.aic-session-list { display: flex; flex-direction: column; gap: 2px; }
.aic-session {
  display: flex; flex-direction: column; gap: 2px; text-align: left; position: relative;
  border: 0; background: none; font: inherit; padding: 10px 12px; border-radius: 8px; cursor: pointer;
}
.aic-session:hover { background: var(--color-error-soft); }
.aic-session.on { background: var(--color-error-soft); box-shadow: inset 2px 0 0 var(--color-primary); }
.aic-session b { font-size: 13px; font-weight: 500; color: #3d2c2c; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; padding-right: 20px; }
.aic-session span { font-size: 12px; color: #a38b86; }
.aic-session-del {
  position: absolute; top: 8px; right: 8px; font-style: normal; color: #c4a9a4;
  font-size: 14px; line-height: 1; padding: 2px 5px; border-radius: 6px; cursor: pointer;
}
.aic-session-del:hover { background: #f5ddd7; color: var(--color-primary); }
.aic-empty { font-size: 13px; color: #a38b86; padding: 16px 8px; text-align: center; }

.aic-fav-list { display: flex; flex-direction: column; gap: 14px; }
.aic-fav { border-bottom: 1px solid #f5e4e0; padding-bottom: 12px; }
.aic-fav-head { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.aic-fav-head b { font-size: 14px; color: #3d2c2c; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.aic-fav-head span { font-size: 12px; color: #a38b86; flex-shrink: 0; }
.aic-fav-head i { margin-left: auto; font-style: normal; cursor: pointer; color: #c4a9a4; padding: 2px 6px; border-radius: 6px; flex-shrink: 0; }
.aic-fav-head i:hover { background: #f5ddd7; color: var(--color-primary); }
.aic-fav-body { font-size: 14px; line-height: 1.7; max-height: 220px; overflow: auto; color: #3d2c2c; }

/* ---------- 作业批改：入口卡片（一键批改 / 分阶段批改） ---------- */
.aic-entry-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 14px; }
.aic-entry {
  text-align: left; border: 1px solid rgba(237, 204, 198, 0.9); border-radius: 8px;
  background: rgba(255, 252, 251, 0.92); box-shadow: 0 4px 18px rgba(199, 53, 64, 0.06);
  padding: 22px 22px 20px; cursor: pointer; font: inherit; color: #3d2c2c;
  display: flex; flex-direction: column; gap: 8px;
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}
.aic-entry:hover { transform: translateY(-2px); border-color: var(--color-primary); box-shadow: 0 10px 28px rgba(199, 53, 64, 0.14); }
.aic-entry-icon {
  width: 44px; height: 44px; border-radius: 8px; background: var(--color-error-soft); color: var(--color-primary);
  display: inline-flex; align-items: center; justify-content: center; margin-bottom: 4px;
}
.aic-entry b { font-size: 17px; font-weight: 700; color: var(--color-primary-active); }
.aic-entry p { margin: 0; font-size: 13px; line-height: 1.7; color: #8c7370; }

.aic-back-row { display: flex; align-items: center; gap: 10px; margin: 14px 0 4px; }
.aic-back-row b { font-size: 16px; color: var(--color-primary-active); }
.aic-backlink { border: 0; background: none; font: inherit; font-size: 14px; color: #8c7370; cursor: pointer; padding: 4px 8px; border-radius: 8px; }
.aic-backlink:hover { color: var(--color-primary); background: var(--color-error-soft); }
.aic-row2 { display: flex; gap: 14px; align-items: stretch; }
.aic-row2 .oc-full input { width: 100%; margin-top: 6px; }

/* 进度条 */
.aic-progresswrap { margin: 16px 0 8px; }
.aic-progressbar { height: 10px; border-radius: 6px; background: #f5e4e0; overflow: hidden; }
.aic-progressbar i { display: block; height: 100%; width: 0; border-radius: 6px; background: var(--color-primary); transition: width 0.3s; }
.aic-progresstext { display: block; font-size: 13px; color: #8c7370; margin-top: 8px; }

/* 批改进度条（后台保留细节，界面只展示三个阶段） */
.aic-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; margin: 14px 0 16px; }
.aic-step {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 10px 4px; border-radius: 8px; border: 1px solid transparent;
  font-size: 12px; color: #a38b86; text-align: center;
}
.aic-step i {
  font-style: normal; width: 22px; height: 22px; border-radius: 8px; line-height: 22px;
  background: #f5e4e0; color: #a38b86; font-size: 12px; font-weight: 700; text-align: center;
}
.aic-step.current { color: var(--color-primary); font-weight: 600; border-color: #edccc6; background: #fdf5f3; }
.aic-step.current i { background: var(--color-primary); color: #fff; }
.aic-step.done { color: var(--color-primary-active); }
.aic-step.done i { background: var(--color-primary-active); color: #fff; }
.aic-step-nav { display: flex; justify-content: space-between; gap: 10px; margin: 18px 0 8px; }
.aic-pill.primary { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.aic-pill.primary:hover { background: #a82a34; border-color: #a82a34; color: #fff; }
.aic-pill:disabled { opacity: 0.45; cursor: not-allowed; }

/* 成绩表 */
.aic-score-table { width: 100%; border-collapse: collapse; margin-top: 14px; background: rgba(255, 252, 251, 0.92); border-radius: 8px; overflow: hidden; box-shadow: 0 2px 10px rgba(199, 53, 64, 0.06); }
.aic-score-table th, .aic-score-table td { padding: 9px 12px; border-bottom: 1px solid #f5e4e0; font-size: 13px; text-align: left; color: #3d2c2c; }
.aic-score-table th { background: var(--color-error-soft); font-weight: 600; color: var(--color-primary-active); white-space: nowrap; }
.aic-score-table tr:last-child td { border-bottom: 0; }
.aic-band { display: inline-block; min-width: 52px; text-align: center; padding: 2px 8px; border-radius: 6px; font-size: 12px; font-weight: 600; }
.aic-band.good { background: #e8f5ee; color: #1d7a4f; }
.aic-band.mid { background: #e8f1fa; color: #2563eb; }
.aic-band.low { background: var(--color-error-soft); color: var(--color-error); }
.aic-band.skip { background: #f1f1f1; color: #999; }
.aic-comment-cell { max-width: 380px; }
.aic-score-input { width: 64px; height: 28px; border: 1px solid #e7d5d0; border-radius: 8px; font: inherit; font-size: 13px; padding: 0 8px; color: #3d2c2c; }
.aic-score-input:focus { border-color: var(--color-primary); outline: none; }

/* 匹配学生步骤 */
.aic-match-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.aic-match-item { display: inline-flex; align-items: center; gap: 6px; border: 1px solid #e7d5d0; background: #fff; border-radius: 6px; padding: 5px 12px; font-size: 13px; color: #3d2c2c; }
.aic-match-item input { accent-color: var(--color-primary); }

/* 导出步骤 */
.aic-export-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.aic-stat-row { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 12px; }
.aic-stat { background: rgba(255, 252, 251, 0.92); border: 1px solid #f5e4e0; border-radius: 8px; padding: 12px 18px; }
.aic-stat b { display: block; font-size: 22px; color: var(--color-primary); font-weight: 700; }
.aic-stat span { font-size: 12px; color: #8c7370; }

/* ---------- 设置面板（聊天背景） ---------- */
.aic-panel.slim { width: min(400px, 100vw); }
.aic-set-title { font-size: 15px; font-weight: 600; color: #3d2c2c; margin: 4px 0 12px; }
.aic-model-pick { display: flex; flex-direction: column; gap: 8px; margin: 0 0 16px; font-size: 13px; color: #3d2c2c; }
.aic-model-pick select { height: 36px; border: 1px solid #e7d5d0; border-radius: 6px; padding: 0 10px; font: inherit; font-size: 14px; background: #fff; color: #1c252d; }
.aic-bg-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.aic-bg-item { border: 2px solid transparent; border-radius: 8px; overflow: hidden; cursor: pointer; padding: 0; background: none; font: inherit; }
.aic-bg-item .swatch { height: 74px; width: 100%; display: block; background-size: cover; background-position: center; box-shadow: inset 0 0 0 1px var(--color-border); }
.aic-bg-item span { display: block; padding: 7px 10px; font-size: 13px; color: #3d2c2c; text-align: left; background: #fffdfb; }
.aic-bg-item.on { border-color: var(--color-primary); }
.aic-bg-item.on span { color: var(--color-primary); font-weight: 600; }
.aic-set-note { font-size: 12px; color: #a38b86; line-height: 1.7; margin-top: 14px; }

/* ---------- 窄屏 ---------- */
@media (max-width: 720px) {
  .aic-toprow { padding: 10px 28px 0; flex-wrap: wrap; }
  .aic-hero, .aic-grading { padding-top: 4vh; }
  .aic-hero-title { font-size: 26px; }
  .aic-hero-input { max-width: 100%; }
  .aic-feats button { padding: 6px 10px; }
  .aic-bubble { max-width: 88%; }
  .aic-grade-card { padding: 16px; }
  .aic-entry-grid { grid-template-columns: 1fr; }
  .aic-row2 { flex-direction: column; }
  .aic-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .aic-score-table { display: block; overflow-x: auto; }
}

/* ==================== 作业批改 v4（对齐原版交互） ==================== */
.aic-grading-sub { font-size: 14px; color: #8c7370; margin: 4px 0 18px; text-align: center; line-height: 1.7; max-width: 520px; }
.aic-hero-title.small { font-size: 26px; }
.aic-newtask {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid #edccc6; background: #fffdfb; color: var(--color-primary-active);
  border-radius: 6px; padding: 10px 22px; font-size: 15px; font-weight: 600;
  box-shadow: 0 4px 16px rgba(199, 53, 64, 0.1); cursor: pointer; transition: all .18s;
}
.aic-newtask:hover { background: var(--color-primary); border-color: var(--color-primary); color: #fff; transform: translateY(-1px); }

/* 玻璃弹窗（对齐原版 AICenterGlassModal） */
.aic-modal-overlay {
  position: fixed; inset: 0; z-index: 80; display: flex; align-items: center; justify-content: center;
  background: rgba(15, 23, 42, 0.25); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); padding: 16px;
}
.aic-modal-panel {
  display: flex; flex-direction: column; width: 100%; overflow: hidden;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(28px) saturate(180%); -webkit-backdrop-filter: blur(28px) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.72); border-radius: 8px; color: #111827;
  box-shadow: 0 28px 80px rgba(15, 23, 42, 0.16), inset 0 1px 0 rgba(255, 255, 255, 0.85);
  max-height: min(calc(100dvh - 3rem), 860px);
}
.aic-modal-md { max-width: 620px; }
.aic-modal-lg { max-width: 1080px; }
.aic-modal-head {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 12px;
  padding: 16px 20px 14px; border-bottom: 1px solid rgba(199, 53, 64, 0.12); flex-shrink: 0;
}
.aic-modal-head h2 { font-size: 18px; font-weight: 600; color: #3d2c2c; margin: 0; }
.aic-modal-head p { font-size: 12px; color: #8c7370; margin: 2px 0 0; }
.aic-modal-body { min-height: 0; flex: 1; overflow-y: auto; padding: 16px 20px; }
.aic-modal-foot {
  display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap;
  padding: 12px 20px; border-top: 1px solid rgba(199, 53, 64, 0.12); flex-shrink: 0;
}
.aic-foot-left, .aic-foot-right { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

/* 入口卡片（原版两卡） */
.aic-entry-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 6px; }
.aic-entry {
  position: relative; display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: 168px; padding: 22px 16px; border: 2px solid #e7d5d0; border-radius: 8px;
  background: #fffdfb; cursor: pointer; text-align: center; transition: all .18s; font: inherit;
}
.aic-entry:hover { transform: translateY(-2px); border-color: var(--color-primary); background: #fff; box-shadow: 0 8px 22px rgba(199, 53, 64, 0.12); }
.aic-entry:active { transform: translateY(0) scale(.98); }
.aic-entry b { display: block; font-size: 17px; font-weight: 600; color: #3d2c2c; margin-top: 2px; }
.aic-entry > span { display: block; font-size: 12px; color: #8c7370; margin-top: 8px; line-height: 1.6; }
.aic-entry > i { display: block; font-style: normal; font-size: 11px; color: #b09a95; margin-top: 10px; opacity: 0; transition: opacity .18s; }
.aic-entry:hover > i { opacity: 1; }
.aic-badge {
  position: absolute; right: 10px; top: 10px; background: var(--color-error-soft); color: var(--color-error);
  border-radius: 6px; padding: 2px 8px; font-size: 11px; font-weight: 500;
}
.aic-center-note { text-align: center; font-size: 12px; color: #8c7370; margin-top: 12px; }
.aic-row-inline { display: flex; gap: 8px; align-items: center; margin-top: 6px; }
.aic-row-inline input { flex: 1; }

/* 分组表单 */
.aic-fieldset { border: 1px solid #f0dedb; border-radius: 8px; padding: 14px 16px; margin-bottom: 14px; background: rgba(255, 253, 251, 0.8); }
.aic-fieldset h3 { font-size: 13px; font-weight: 600; color: var(--color-primary-active); margin: 2px 0 12px; letter-spacing: .02em; }
.aic-field input, .aic-field textarea, .aic-row-inline input {
  width: 100%; margin-top: 6px; border: 1px solid #e7d5d0; border-radius: 8px; padding: 8px 10px;
  font: inherit; font-size: 13px; color: #3d2c2c; background: #fff; outline: none;
}
.aic-field input:focus, .aic-field textarea:focus, .aic-row-inline input:focus { border-color: var(--color-primary); }

/* 拖拽上传 */
.aic-drop {
  display: flex; flex-direction: column; align-items: center; gap: 6px; cursor: pointer;
  border: 1.5px dashed #d8c3be; border-radius: 8px; padding: 22px 16px; background: #fffdfb;
  color: #8c7370; text-align: center; transition: all .18s;
}
.aic-drop:hover, .aic-drop.over { border-color: var(--color-primary); background: #fff8f6; color: var(--color-primary-active); }
.aic-drop b { font-size: 13px; color: #3d2c2c; font-weight: 600; }
.aic-drop span { font-size: 12px; }
.aic-thumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.aic-thumb {
  position: relative; width: 84px; border: 1px solid #f0dedb; border-radius: 8px; overflow: hidden; background: #fff;
}
.aic-thumb img { width: 100%; height: 58px; object-fit: cover; display: block; }
.aic-thumb span { display: block; font-size: 11px; color: #6b5250; padding: 3px 5px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.aic-thumb i { position: absolute; right: 2px; top: 0; font-style: normal; color: #fff; background: rgba(0,0,0,.45); border-radius: 0 0 6px 6px; padding: 0 4px; cursor: pointer; font-size: 12px; }

/* 预检清单 */
.aic-checklist { display: flex; flex-direction: column; gap: 10px; }
.aic-check-group { border: 1px solid #f0dedb; border-radius: 8px; padding: 10px 12px; background: #fff; }
.aic-check-group h4 { font-size: 12px; font-weight: 600; color: #6b5250; margin: 0 0 6px; }
.aic-check-group ul { list-style: none; margin: 0; padding: 0; }
.aic-check-group li { display: flex; align-items: baseline; gap: 8px; font-size: 12px; padding: 3px 0; color: #3d2c2c; }
.aic-check-group li .dot { width: 16px; text-align: center; font-weight: 700; flex-shrink: 0; }
.aic-check-group li.ok .dot { color: #1d7a4f; }
.aic-check-group li.miss .dot { color: var(--color-error); }
.aic-check-group li.warn .dot { color: var(--color-warning); }
.aic-check-group li .ms { color: #a38b86; font-size: 12px; }
.aic-alert.danger { margin-top: 10px; border: 1px solid #f5c6c3; background: var(--color-error-soft); color: var(--color-error); border-radius: 8px; padding: 8px 12px; font-size: 12px; }

/* 托管模式 */
.aic-mode-row { display: flex; gap: 8px; flex-wrap: wrap; }
.aic-radio {
  display: inline-flex; align-items: center; gap: 6px; cursor: pointer; font-size: 13px;
  border: 1px solid #e7d5d0; background: #fff; border-radius: 6px; padding: 7px 16px; color: #3d2c2c; transition: all .16s;
}
.aic-radio input { accent-color: var(--color-primary); }
.aic-radio.on { background: var(--color-primary-active); border-color: var(--color-primary-active); color: #fff; }
.aic-check { display: flex; align-items: flex-start; gap: 8px; font-size: 12px; color: #6b5250; margin-top: 10px; cursor: pointer; }
.aic-check input { accent-color: var(--color-primary); margin-top: 2px; }

/* 流水线 / 进度 */
.aic-pipeline { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-bottom: 18px; }
.aic-pipe-step { display: flex; flex-direction: column; align-items: center; gap: 4px; font-size: 12px; color: #b09a95; text-align: center; }
.aic-pipe-step i { font-style: normal; width: 22px; height: 22px; border-radius: 8px; line-height: 22px; background: #f5e4e0; color: #a38b86; font-size: 12px; font-weight: 700; }
.aic-pipe-step.current { color: var(--color-primary-active); font-weight: 600; }
.aic-pipe-step.current i { background: var(--color-primary-active); color: #fff; }
.aic-pipe-step.done { color: #1d7a4f; }
.aic-pipe-step.done i { background: #1d7a4f; color: #fff; }
.aic-live { margin-top: 12px; }
.aic-pause {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  border: 1px solid #f0dedb; background: #fffdfb; border-radius: 8px; padding: 10px 14px;
}
.aic-pause b { font-size: 13px; color: #3d2c2c; }
.aic-pause span { font-size: 12px; color: #8c7370; }

/* 验收卡 */
.aic-matchstats { display: flex; gap: 12px; flex-wrap: wrap; }
.aic-mstat { flex: 1; min-width: 96px; border: 1px solid #f0dedb; border-radius: 8px; padding: 10px 14px; background: #fff; }
.aic-mstat p { font-size: 12px; color: #8c7370; margin: 0; }
.aic-mstat b { display: block; font-size: 22px; color: var(--color-primary-active); font-weight: 700; }
.aic-score-table .rate { color: var(--color-error); font-weight: 600; }
.aic-samples { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.aic-sample { border: 1px solid #f0dedb; border-radius: 8px; padding: 10px 12px; background: #fff; }
.aic-sample b { font-size: 12px; color: #3d2c2c; }
.aic-sample p { font-size: 12px; color: #8c7370; margin: 4px 0 0; line-height: 1.6; }
.aic-sample.good { border-left: 3px solid #1d7a4f; }
.aic-sample.low { border-left: 3px solid var(--color-error); }

/* 三级批改流程 */
.aic-steps3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin-bottom: 14px; }
.aic-wstep {
  position: relative; display: flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 52px; padding: 6px 8px; border-radius: 8px; border: 1px solid transparent;
  background: rgba(255, 255, 255, 0.75); color: #6b5250; cursor: pointer; font: inherit; transition: all .16s;
}
.aic-wstep .num { width: 22px; height: 22px; border-radius: 8px; line-height: 22px; background: #f0dedb; color: #6b5250; font-size: 12px; font-weight: 700; flex-shrink: 0; }
.aic-wstep .txt { display: flex; flex-direction: column; align-items: flex-start; min-width: 0; }
.aic-wstep .txt b { font-size: 13px; font-weight: 600; white-space: nowrap; }
.aic-wstep .txt i { font-style: normal; font-size: 11px; color: #a38b86; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }
.aic-wstep.current { background: var(--color-primary-active); color: #fff; }
.aic-wstep.current .num { background: rgba(255, 255, 255, 0.22); color: #fff; }
.aic-wstep.current .txt i { color: rgba(255, 255, 255, 0.75); }
.aic-wstep.done { background: #e8f5ee; color: #1d7a4f; border-color: #bfe3cf; }
.aic-wstep.done .num { background: #1d7a4f; color: #fff; }
.aic-wstep.done .txt i { color: #4b8f6d; }
.aic-wstep .pdot { position: absolute; right: 6px; top: 6px; width: 7px; height: 7px; border-radius: 8px; background: #f59e0b; }
.aic-step-body { min-height: 0; }
.aic-draftchip { font-size: 12px; border-radius: 6px; padding: 4px 12px; }
.aic-draftchip.ok { background: #e8f5ee; color: #1d7a4f; }
.aic-draftchip.err { background: var(--color-error-soft); color: var(--color-error); }

@media (max-width: 900px) {
  .aic-modal-lg { max-width: 100%; }
  .aic-steps3, .aic-pipeline { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .aic-samples { grid-template-columns: 1fr; }
  .aic-entry-grid { grid-template-columns: 1fr; }
}

/* ===================== 夜间模式适配 ===================== */
/* 壁纸夜间压暗遮罩：固定层 + 内容抬到遮罩之上，保证气泡可读 */
[data-skin="night"] .aic-wrap[data-bg]::after {
  content: ""; position: fixed; inset: 0; z-index: 1; pointer-events: none;
  background: rgba(10, 12, 16, 0.62);
}
[data-skin="night"] #aiApp { position: relative; z-index: 2; }
/* 顶部 pill */
[data-skin="night"] .aic-pill {
  background: var(--color-surface); color: var(--color-text-primary);
  border-color: var(--color-border); box-shadow: none;
}
[data-skin="night"] .aic-pill:hover { background: var(--color-surface-hover); color: var(--color-primary); border-color: var(--color-primary-border); }
/* 功能行 / chips */
[data-skin="night"] .aic-feats button { background: var(--color-surface); color: var(--color-text-secondary); border-color: var(--color-border); }
[data-skin="night"] .aic-dock .aic-feats button,
[data-skin="night"] .aic-dock .aic-feats button:first-child { background: var(--color-surface); }
[data-skin="night"] .aic-feats button.on,
[data-skin="night"] .aic-feats button:hover { color: var(--color-primary); }
[data-skin="night"] .aic-chips button { background: var(--color-surface); color: var(--color-text-secondary); border-color: var(--color-border); }
[data-skin="night"] .aic-chips button.on { background: var(--color-surface); color: var(--color-primary); border-color: var(--color-primary); }
/* 输入卡片 */
[data-skin="night"] .aic-card { background: rgba(26, 29, 36, 0.92); border-color: var(--color-border-strong); }
[data-skin="night"] .aic-card:focus-within { border-color: var(--color-primary); box-shadow: none; }
[data-skin="night"] .aic-card textarea { color: var(--color-text-primary); }
/* AI 气泡与消息操作 */
[data-skin="night"] .aic-bubble.ai { background: var(--color-surface); color: var(--color-text-primary); border-color: var(--color-border); }
[data-skin="night"] .aic-msg-actions { border-color: var(--color-border); }
[data-skin="night"] .aic-msg-actions button { color: var(--color-text-tertiary); }
[data-skin="night"] .aic-msg-actions button:hover { color: var(--color-primary); background: var(--color-primary-soft); }
/* 作业批改卡片 / 字段输入 */
[data-skin="night"] .aic-grade-card { background: var(--color-surface); border-color: var(--color-border); box-shadow: none; }
[data-skin="night"] .aic-field,
[data-skin="night"] .aic-num { color: var(--color-text-secondary); }
[data-skin="night"] .aic-field textarea,
[data-skin="night"] .aic-num input { background: var(--color-surface); color: var(--color-text-primary); border-color: var(--color-border); box-shadow: none; }
[data-skin="night"] .aic-field textarea:focus,
[data-skin="night"] .aic-num input:focus { border-color: var(--color-primary); }
[data-skin="night"] .aic-status,
[data-skin="night"] .aic-score i,
[data-skin="night"] .aic-typing-text { color: var(--color-text-tertiary); }
/* 草稿芯片状态 */
[data-skin="night"] .aic-draftchip.ok { background: var(--color-success-soft); color: var(--color-success); }
[data-skin="night"] .aic-draftchip.err { background: var(--color-warning-soft); color: var(--color-warning); }

/* ================= AI 学术中心 ================= */
/* 默认单条滚动路径（.aic-grading 负责滚动）；仅当开启文献阅读时切成双列内滚。 */
.aic-grading .sch-wrap { width: 100%; max-width: var(--width-content); margin: 0 auto; display: flex; flex-direction: column; gap: var(--space-3); }
/* 问候语 + 模式胶囊：与落地 Hero 用同一个 h1（同字号同外边距），
   两个视图的胶囊自然落在同一垂直位置，切换 AI备课/AI学术 时不上下跳。 */
.sch-top { display: flex; flex-direction: column; align-items: center; }
.sch-seg-row { display: flex; justify-content: center; }
/* 任务模式条：整条居中，窄屏整组换行（学科切换在输入框内） */
.sch-tools { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; row-gap: var(--space-3); }
/* 学科切换：输入框底部的小椭圆开关（在两个学科间循环切换；属 AGENTS.md 允许的「开关」圆形语义控件） */
.sch-disc-switch { display: inline-flex; align-items: center; gap: var(--space-1); height: 28px; max-width: 100%; padding: 0 var(--space-2); border: 1px solid var(--color-border-strong); border-radius: 999px; background: var(--color-surface); color: var(--color-text-secondary); font: inherit; font-size: 12px; font-weight: 600; white-space: nowrap; cursor: pointer; }
.sch-disc-switch[hidden] { display: none; }
.sch-disc-switch:hover { border-color: var(--color-primary-border); color: var(--color-primary); }
.sch-disc-switch svg { flex-shrink: 0; }
.sch-disc-switch-name { overflow: hidden; text-overflow: ellipsis; }
/* 结果列 + 右侧文献阅读面板同排；结果列限宽 820px，与 Hero 输入卡对齐且适合读长文 */
.sch-body { display: flex; justify-content: center; align-items: stretch; gap: var(--space-4); }
/* 面板与左侧输入卡同规格：同一种表面色 + 同一种边框 + 同一个圆角，读作一对同层级容器 */
.sch-read { flex: 0 0 clamp(340px, 32vw, 480px); display: flex; flex-direction: column; min-width: 0; min-height: 0; border: 1px solid var(--color-border-strong); border-radius: var(--radius-overlay); background: var(--color-surface); overflow: hidden; }
.sch-read[hidden] { display: none; }
.sch-read-head { display: flex; align-items: center; gap: var(--space-2); flex-shrink: 0; padding: var(--space-2) var(--space-3); border-bottom: 1px solid var(--color-border); }
.sch-read-head b { font-size: 14px; color: var(--color-text-primary); }
.sch-read-close { margin-left: auto; width: 26px; height: 26px; display: inline-flex; align-items: center; justify-content: center; border: 0; border-radius: var(--radius-control); background: none; color: var(--color-text-tertiary); font: inherit; font-size: 16px; line-height: 1; cursor: pointer; }
.sch-read-close:hover { background: var(--color-background); color: var(--color-text-primary); }
.sch-read-body { flex: 1; overflow-y: auto; min-height: 0; padding: var(--space-3); }
/* 打开文献阅读后：改为左右双列各自内滚（同对话视图），页面不再整体滚动 */
.aic-grading.read-on { display: flex; flex-direction: column; overflow: hidden; }
.aic-grading.read-on .sch-wrap { flex: 1; min-height: 0; }
.aic-grading.read-on .sch-body { flex: 1; min-height: 0; }
.aic-grading.read-on .sch-main { min-height: 0; }
/* 结果流按内容高度占位、超出才内滚：结果少时输入框仍紧跟在下方，不会掉到屏幕底端 */
.aic-grading.read-on .sch-feed { flex: 0 1 auto; overflow-y: auto; min-height: 0; }
.aic-grading.read-on .sch-input { flex-shrink: 0; }
.sch-btn { height: 32px; padding: 0 var(--space-3); border: 1px solid var(--color-border-strong); border-radius: var(--radius-control); background: var(--color-surface); color: var(--color-text-secondary); font: inherit; font-size: 13px; white-space: nowrap; cursor: pointer; }
.sch-btn:hover { border-color: var(--color-primary-border); color: var(--color-primary); }
.sch-btn-primary { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-primary-foreground); }
.sch-btn-primary:hover { background: var(--color-primary-hover); color: var(--color-primary-foreground); }
.sch-btn-danger { color: var(--color-error); }
.sch-btn-danger:hover { border-color: var(--color-error); color: var(--color-error); }

/* 任务模式：相连边框式按钮条（同 AI 备课功能条），选中红字 + 线性图标；窄屏整组换行 */
.sch-modes { display: flex; flex-wrap: wrap; width: fit-content; max-width: 100%; overflow-x: auto; }
.sch-modes button { display: inline-flex; align-items: center; gap: 6px; min-height: 32px; padding: 6px var(--space-3); border: 1px solid var(--color-border); border-left-width: 0; background: transparent; font: inherit; font-size: 13px; font-weight: 600; color: var(--color-text-secondary); white-space: nowrap; cursor: pointer; transition: color 0.15s, background 0.15s; }
.sch-modes button:first-child { border-left-width: 1px; }
.sch-modes button:hover { color: var(--color-primary); }
.sch-modes button.on { color: var(--color-primary); background: var(--color-primary-soft); }
.sch-modes svg { flex-shrink: 0; }

.sch-main { flex: 1 1 auto; min-width: 0; max-width: 820px; display: flex; flex-direction: column; gap: var(--space-3); }
.sch-feed { display: flex; flex-direction: column; }
/* 尚无结果时结果流不占位：输入卡顶边与右侧文献阅读面板顶边对齐（不会平白低 12px） */
.sch-feed:empty { display: none; }
.sch-side-tabs { display: flex; gap: var(--space-6); border-bottom: 1px solid var(--color-border); }
.sch-side-tabs button { background: none; border: none; padding: var(--space-1) 0; font: inherit; font-size: 14px; color: var(--color-text-secondary); border-bottom: 2px solid transparent; cursor: pointer; }
.sch-side-tabs button.on { color: var(--color-text-primary); border-bottom-color: var(--color-primary); font-weight: 600; }
.sch-side-body { padding-top: var(--space-3); }
/* 设置 · AI 学术分区：研究项目选择行（.sch-side-tabs / .sch-side-body 在此复用） */
.sch-set-proj { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); margin-bottom: var(--space-2); }
.sch-set-proj select { width: auto; height: 32px; min-width: 220px; max-width: 100%; border: 1px solid var(--color-border-strong); border-radius: var(--radius-control); background: var(--color-surface); color: var(--color-text-primary); font: inherit; font-size: 13px; padding: 0 var(--space-2); }

.sch-empty-sub { font-size: 13px; color: var(--color-text-tertiary); }
.sch-empty-side { font-size: 14px; color: var(--color-text-secondary); }
.sch-empty-side p { margin: 0 0 var(--space-2); line-height: 1.8; }
.sch-none { font-size: 13px; color: var(--color-text-tertiary); padding: var(--space-2) 0; }

.sch-turn { padding: var(--space-4) 0; border-bottom: 1px solid var(--color-border); }
.sch-turn-head { display: flex; align-items: baseline; gap: var(--space-2); margin-bottom: var(--space-2); flex-wrap: wrap; }
.sch-turn-mode { font-size: 12px; color: var(--color-primary); border: 1px solid var(--color-primary-border); border-radius: var(--radius-control); padding: 1px var(--space-2); white-space: nowrap; }
.sch-turn-q { font-size: 14px; font-weight: 600; color: var(--color-text-secondary); }
.sch-answer { font-size: 16px; line-height: 1.85; color: var(--color-text-primary); }
.sch-loading { font-size: 14px; color: var(--color-text-tertiary); }
.sch-error { font-size: 14px; color: var(--color-error); }
.sch-warn { border-left: 3px solid var(--color-warning); background: var(--color-warning-soft); padding: var(--space-2) var(--space-3); margin: var(--space-3) 0; }
.sch-warn b { display: block; font-size: 13px; color: var(--color-warning); margin-bottom: var(--space-1); }
.sch-warn ul { margin: 0; padding-left: var(--space-6); font-size: 13px; line-height: 1.7; color: var(--color-warning); }
.sch-evidence { margin-top: var(--space-4); }
.sch-evidence h4 { margin: 0 0 var(--space-2); font-size: 14px; font-weight: 600; color: var(--color-text-secondary); }
.sch-cites { list-style: none; margin: 0; padding: 0; }
.sch-cite { display: flex; gap: var(--space-2); padding: var(--space-2) 0; border-top: 1px solid var(--color-border); }
.sch-cite-no { flex-shrink: 0; font-size: 13px; color: var(--color-text-tertiary); font-variant-numeric: tabular-nums; }
.sch-cite-body { min-width: 0; }
.sch-cite-title { font-size: 14px; color: var(--color-text-primary); line-height: 1.55; }
.sch-cite-meta { margin-top: 2px; font-size: 12px; color: var(--color-text-tertiary); line-height: 1.5; }
.sch-cite-tags { margin-top: var(--space-1); }
.sch-tag { display: inline-block; margin-right: var(--space-1); padding: 1px var(--space-2); font-size: 11px; line-height: 1.5; color: var(--color-text-secondary); border: 1px solid var(--color-border); border-radius: var(--radius-control); white-space: nowrap; }
.sch-tag-fulltext { color: var(--color-success); background: var(--color-success-soft); border-color: var(--color-success); }
.sch-tag-abstract { color: var(--color-warning); background: var(--color-warning-soft); border-color: var(--color-warning); }
.sch-tag-metadata { color: var(--color-text-tertiary); }
.sch-tag-warn { color: var(--color-warning); border-color: var(--color-warning); }
.sch-tag-scope { color: var(--color-text-tertiary); }
.sch-scope { margin: var(--space-3) 0 0; font-size: 12px; line-height: 1.7; color: var(--color-text-tertiary); }
.sch-turn-acts { display: flex; gap: var(--space-3); margin-top: var(--space-3); flex-wrap: wrap; }
.sch-turn-acts button { border: 1px solid var(--color-border-strong); border-radius: var(--radius-control); background: var(--color-surface); color: var(--color-text-secondary); font: inherit; font-size: 13px; padding: var(--space-1) var(--space-3); cursor: pointer; }
.sch-turn-acts button:hover { border-color: var(--color-primary-border); color: var(--color-primary); }
.sch-act-note { font-size: 12px; color: var(--color-text-tertiary); }

.sch-input { display: flex; flex-direction: column; gap: var(--space-2); padding: var(--space-3); border: 1px solid var(--color-border-strong); border-radius: var(--radius-overlay); background: var(--color-surface); }
.sch-input:focus-within { border-color: var(--color-primary-border); }
.sch-input textarea { border: none; outline: none; resize: none; width: 100%; background: transparent; color: var(--color-text-primary); font: inherit; font-size: 15px; line-height: 1.65; min-height: 52px; max-height: 220px; }
.sch-input textarea::placeholder { color: var(--color-text-tertiary); }
.sch-input-foot { display: flex; align-items: center; gap: var(--space-3); }
.sch-hint { margin-right: auto; font-size: 12px; color: var(--color-text-tertiary); min-width: 0; }

.sch-docs-bar { display: flex; gap: var(--space-2); }
.sch-docs-bar input[type="search"] { flex: 1; min-width: 0; height: 32px; padding: 0 var(--space-2); border: 1px solid var(--color-border-strong); border-radius: var(--radius-control); background: var(--color-surface); color: var(--color-text-primary); font: inherit; font-size: 13px; }
.sch-docs-count { margin: var(--space-2) 0; font-size: 12px; color: var(--color-text-tertiary); }
.sch-doc-list { list-style: none; margin: 0; padding: 0; }
.sch-doc-row { padding: var(--space-2) 0; border-bottom: 1px solid var(--color-border); cursor: pointer; }
.sch-doc-row:hover .sch-doc-title { color: var(--color-primary); }
/* 边读边问：当前选中文献的行——左侧 2px 主题色边线 + 标题着色，不用底色胶囊 */
.sch-doc-row.on { padding-left: var(--space-2); border-left: 2px solid var(--color-primary); }
.sch-doc-row.on .sch-doc-title { color: var(--color-primary); }
.sch-tag-picked { color: var(--color-primary); border-color: var(--color-primary); }
.sch-doc-title { font-size: 14px; line-height: 1.5; color: var(--color-text-primary); }
.sch-doc-meta { margin-top: 2px; font-size: 12px; color: var(--color-text-tertiary); line-height: 1.5; }
.sch-doc-tags { margin-top: var(--space-1); }
.sch-doc-detail-title { margin: var(--space-2) 0 var(--space-1); font-size: 16px; color: var(--color-text-primary); line-height: 1.5; }
.sch-doc-detail-meta { font-size: 12px; color: var(--color-text-tertiary); line-height: 1.6; }
.sch-doc-facts { display: flex; flex-wrap: wrap; gap: var(--space-3); margin: var(--space-2) 0; font-size: 12px; color: var(--color-text-tertiary); }
.sch-doc-detail h4 { margin: var(--space-3) 0 var(--space-1); font-size: 14px; color: var(--color-text-secondary); }
.sch-abstract { font-size: 13px; line-height: 1.8; color: var(--color-text-secondary); }
.sch-doc-preview { font-size: 14px; line-height: 1.75; color: var(--color-text-secondary); }
.sch-back, .sch-mini { background: none; border: none; padding: 0; color: var(--color-primary); font: inherit; font-size: 13px; cursor: pointer; }

.sch-proj-form { display: flex; flex-direction: column; gap: var(--space-2); }
.sch-proj-form label { display: flex; flex-direction: column; gap: var(--space-1); font-size: 13px; color: var(--color-text-secondary); }
.sch-proj-form input, .sch-proj-form textarea { width: 100%; box-sizing: border-box; padding: 6px var(--space-2); border: 1px solid var(--color-border-strong); border-radius: var(--radius-control); background: var(--color-surface); color: var(--color-text-primary); font: inherit; font-size: 14px; resize: vertical; }
.sch-proj-acts { display: flex; gap: var(--space-2); margin-top: var(--space-2); flex-wrap: wrap; }
.sch-side-sec { margin-top: var(--space-4); padding-top: var(--space-3); border-top: 1px solid var(--color-border); }
.sch-side-sec h4 { display: flex; align-items: center; justify-content: space-between; margin: 0 0 var(--space-2); font-size: 14px; color: var(--color-text-primary); }
.sch-notes, .sch-mats { list-style: none; margin: 0; padding: 0; }
.sch-note { display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--space-1); padding: var(--space-2) 0; border-bottom: 1px solid var(--color-border); font-size: 13px; }
.sch-note-kind { font-size: 11px; color: var(--color-text-tertiary); }
.sch-note-text { flex: 1; min-width: 0; color: var(--color-text-primary); line-height: 1.6; }
.sch-note-acts { margin-left: auto; display: flex; gap: var(--space-2); }
.sch-note-acts button { background: none; border: none; padding: 0; color: var(--color-primary); font: inherit; font-size: 12px; cursor: pointer; }
.sch-mat { display: flex; align-items: center; gap: var(--space-2); padding: var(--space-2) 0; border-bottom: 1px solid var(--color-border); font-size: 13px; }
.sch-mat-title { flex: 1; min-width: 0; color: var(--color-text-primary); }
.sch-mat button { background: none; border: none; padding: 0; color: var(--color-primary); font: inherit; font-size: 12px; cursor: pointer; }

@media (max-width: 640px) {
  /* 很窄时改为上下堆叠：两列各分一半高度、各自内滚；不允许居中溢出到工具栏上 */
  .aic-grading.read-on .sch-body { flex-direction: column; justify-content: flex-start; }
  .aic-grading.read-on .sch-main { flex: 1 1 0; }
  .aic-grading.read-on .sch-read { flex: 1 1 0; max-height: none; }
}

/* ---------- 游客体验态 ----------
   原则：只在未登录时出现；横条常驻但不遮挡输入；额度讲清楚但不用夸张样式。 */
.aic-guestbar {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  width: 100%; max-width: 1120px; margin: 8px auto 0;
  padding: 8px 16px; box-sizing: border-box;
  border: 1px solid var(--color-primary-border, #f3d3d0);
  border-radius: var(--radius-overlay, 8px);
  background: var(--color-primary-soft, #fdf6f5);
  font-size: 13px; line-height: 1.5;
  color: var(--color-text-secondary, #6b5250);
}
.aic-guestbar[hidden] { display: none; }
.agb-tag {
  flex-shrink: 0; padding: 0 6px;
  border: 1px solid var(--color-primary, var(--color-primary));
  border-radius: 4px; color: var(--color-primary, var(--color-primary));
  font-size: 11px; line-height: 18px;
}
.agb-text { flex: 1; min-width: 0; }
.agb-quota { flex-shrink: 0; color: var(--color-text-tertiary, #a38b86); font-variant-numeric: tabular-nums; }
.aic-guestbar.is-empty { border-color: var(--color-border-strong, #e7d9d6); background: var(--color-surface, #fff); }
.aic-guestbar.is-empty .agb-quota { color: var(--color-primary, var(--color-primary)); }
.agb-btn {
  flex-shrink: 0; height: 28px; padding: 0 12px;
  border: 1px solid var(--color-primary, var(--color-primary)); border-radius: var(--radius-control, 6px);
  background: var(--color-primary, var(--color-primary)); color: #fff;
  font: inherit; font-size: 13px; cursor: pointer;
}
.agb-btn:hover { background: var(--color-primary-hover, var(--color-primary-hover)); border-color: var(--color-primary-hover, var(--color-primary-hover)); }
.aic-points-bal.is-guest { color: var(--color-primary, var(--color-primary)); font-variant-numeric: tabular-nums; }

/* 注册引导：贴在内容区里的轻量条，可关闭 */
.aic-signup {
  width: 100%; max-width: 1120px; margin: 8px auto 0; box-sizing: border-box;
}
.aic-signup[hidden] { display: none; }
.aic-signup .as-body {
  position: relative;
  display: flex; flex-direction: column; gap: 4px;
  padding: 12px 16px;
  border: 1px solid var(--color-primary-border, #f3d3d0);
  border-radius: var(--radius-overlay, 8px);
  background: var(--color-surface, #fff);
}
.aic-signup .as-title { margin: 0; font-size: 14px; font-weight: 600; color: var(--color-text-primary, #2b2b2b); }
.aic-signup .as-note { margin: 0; font-size: 12px; line-height: 1.6; color: var(--color-text-tertiary, #a38b86); }
.aic-signup .as-acts { display: flex; align-items: center; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
.aic-signup button { font: inherit; font-size: 13px; cursor: pointer; }
.as-primary {
  height: 30px; padding: 0 14px; border-radius: var(--radius-control, 6px);
  border: 1px solid var(--color-primary, var(--color-primary)); background: var(--color-primary, var(--color-primary)); color: #fff;
}
.as-primary:hover { background: var(--color-primary-hover, var(--color-primary-hover)); border-color: var(--color-primary-hover, var(--color-primary-hover)); }
.as-ghost {
  height: 30px; padding: 0 14px; border-radius: var(--radius-control, 6px);
  border: 1px solid var(--color-border-strong, #e7d9d6); background: var(--color-surface, #fff); color: var(--color-text-secondary, #6b5250);
}
.as-ghost:hover { border-color: var(--color-primary-border, #f3d3d0); color: var(--color-primary, var(--color-primary)); }
.as-close {
  position: absolute; top: 6px; right: 8px;
  width: 24px; height: 24px; padding: 0; border: 0; border-radius: var(--radius-control, 6px);
  background: none; color: var(--color-text-tertiary, #a38b86); font-size: 16px; line-height: 1;
}
.as-close:hover { background: var(--color-surface-hover, #f6f6f6); color: var(--color-text-primary, #2b2b2b); }

/* 游客成果动作条：保存 / 继续编辑 / 再次生成 / 导出 */
.aic-guest-acts { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px; }
.aic-guest-acts button {
  height: 28px; padding: 0 12px;
  border: 1px solid var(--color-border-strong, #e7d9d6); border-radius: var(--radius-control, 6px);
  background: var(--color-surface, #fff); color: var(--color-text-secondary, #6b5250);
  font: inherit; font-size: 12px; cursor: pointer;
}
.aic-guest-acts button:hover { border-color: var(--color-primary-border, #f3d3d0); color: var(--color-primary, var(--color-primary)); }
.aic-guest-acts button[data-gact="save"] {
  border-color: var(--color-primary, var(--color-primary)); color: var(--color-primary, var(--color-primary));
}
.aic-guest-acts button[data-gact="save"]:hover { background: var(--color-primary-soft, #fdf6f5); }

/* 额度用完的引导卡（出现在对话流里，可关闭） */
.aic-limit {
  display: flex; flex-direction: column; gap: 8px;
  padding: 12px; border: 1px solid var(--color-primary-border, #f3d3d0);
  border-radius: var(--radius-overlay, 8px); background: var(--color-primary-soft, #fdf6f5);
}
.aic-limit-text { margin: 0; font-size: 14px; line-height: 1.7; color: var(--color-text-primary, #2b2b2b); }
.aic-limit-acts { display: flex; gap: 8px; flex-wrap: wrap; }
.aic-limit-acts button { font: inherit; font-size: 13px; cursor: pointer; }
.aic-limit-primary {
  height: 30px; padding: 0 14px; border-radius: var(--radius-control, 6px);
  border: 1px solid var(--color-primary, var(--color-primary)); background: var(--color-primary, var(--color-primary)); color: #fff;
}
.aic-limit-primary:hover { background: var(--color-primary-hover, var(--color-primary-hover)); border-color: var(--color-primary-hover, var(--color-primary-hover)); }
.aic-limit-ghost {
  height: 30px; padding: 0 14px; border-radius: var(--radius-control, 6px);
  border: 1px solid var(--color-border-strong, #e7d9d6); background: transparent; color: var(--color-text-secondary, #6b5250);
}

/* 功能条上的剩余次数角标 */
.aic-feat-badge {
  margin-left: 4px; padding: 0 4px;
  border-radius: 4px; background: rgba(180, 0, 0, 0.08);
  color: var(--color-primary, var(--color-primary));
  font-size: 11px; font-style: normal; line-height: 16px; font-variant-numeric: tabular-nums;
}
.aic-feats button.is-empty .aic-feat-badge,
.aic-feat-badge.off { background: rgba(120, 113, 108, 0.12); color: var(--color-text-tertiary, #a38b86); }

[data-skin="night"] .aic-guestbar {
  border-color: var(--color-border-strong); background: var(--color-surface-hover); color: var(--color-text-secondary);
}
[data-skin="night"] .aic-guestbar.is-empty { background: var(--color-surface); }
[data-skin="night"] .aic-signup .as-body,
[data-skin="night"] .aic-guest-acts button { border-color: var(--color-border-strong); background: var(--color-surface); }
[data-skin="night"] .aic-limit { border-color: var(--color-border-strong); background: var(--color-surface-hover); }
[data-skin="night"] .aic-feat-badge { background: rgba(255, 255, 255, 0.1); color: var(--color-primary); }