/* ===== 大学生一体化学习工作台 · 样式（浅色主题） ===== */
:root{
  --bg:#f4f6fb; --card:#fff; --line:#e6e9f2; --text:#1c2333; --muted:#6b7590;
  --pri:#1f57c9; --pri-soft:#eaf1ff; --ok:#16a34a; --warn:#e0850b; --danger:#dc2626;
  --shadow:0 1px 2px rgba(20,30,60,.05),0 8px 24px rgba(20,30,60,.06);
  --r:14px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  font-size:14px;line-height:1.6}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3{margin:0;font-weight:650}
a{color:var(--pri)}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-thumb{background:#cfd6e6;border-radius:8px}

/* ---------- 顶栏 ---------- */
.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:14px 22px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:60}
.brand{display:flex;align-items:center;gap:12px}
.logo{width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,#2f6fed,#1f57c9);
  color:#fff;display:grid;place-items:center;font-weight:700;font-size:18px}
.topbar h1{font-size:16px}
.sub{margin:0;font-size:12px;color:var(--muted)}
.top-actions{display:flex;align-items:center;gap:10px}

.pill{display:inline-flex;align-items:center;gap:7px;padding:6px 12px;border-radius:999px;
  font-size:12.5px;background:#f1f3f9;color:var(--muted)}
.pill i{width:8px;height:8px;border-radius:50%;background:#b9c0d4;display:block}
.pill.on{background:#e8f7ee;color:#14803c}.pill.on i{background:#16a34a;box-shadow:0 0 0 3px #16a34a22}
.pill.off i{background:#b9c0d4}

/* ---------- 按钮 ---------- */
.btn{border:1px solid var(--line);background:#fff;border-radius:10px;padding:8px 14px;cursor:pointer;
  transition:.15s;font-size:13px;white-space:nowrap}
.btn:hover{background:#f7f9ff;border-color:#cfd9f2}
.btn.primary{background:var(--pri);border-color:var(--pri);color:#fff}
.btn.primary:hover{background:#1a4bb0}
.btn.ghost{background:transparent;border-color:transparent;color:var(--muted)}
.btn.ghost:hover{background:#f1f3f9;color:var(--text)}
.btn.sm{padding:6px 11px;font-size:12.5px;border-radius:9px}
.btn.danger{color:var(--danger);border-color:#f3d5d5}
.btn:disabled{opacity:.55;cursor:not-allowed}

/* ---------- 布局 ---------- */
.layout{display:flex;align-items:flex-start;gap:18px;padding:18px 22px 40px;max-width:1560px;margin:0 auto}
.side{position:sticky;top:88px;width:172px;flex:0 0 172px;display:flex;flex-direction:column;gap:4px;
  background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:8px;box-shadow:var(--shadow)}
.nav-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border:0;background:transparent;
  border-radius:10px;cursor:pointer;text-align:left;color:var(--muted);transition:.15s}
.nav-item span{font-size:15px}
.nav-item:hover{background:#f4f7ff;color:var(--text)}
.nav-item.active{background:var(--pri-soft);color:var(--pri);font-weight:600}
.main{flex:1;min-width:0;display:flex;flex-direction:column;gap:16px}
.view{display:none;flex-direction:column;gap:16px}
.view.active{display:flex}

/* ---------- 卡片 ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;box-shadow:var(--shadow)}
.card h2{font-size:14.5px;display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding-bottom:11px;margin-bottom:12px;border-bottom:1px solid var(--line)}
.head-actions{display:flex;gap:8px;flex-wrap:wrap}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:1080px){.grid-2{grid-template-columns:1fr}.layout{flex-direction:column}.side{position:static;width:100%;flex-direction:row;flex-wrap:wrap}}
.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
@media(max-width:1080px){.stat-row{grid-template-columns:repeat(2,1fr)}}
.stat{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;box-shadow:var(--shadow)}
.stat label{display:block;font-size:12.5px;color:var(--muted)}
.stat b{display:block;font-size:23px;margin:3px 0 1px;font-weight:700}
.stat small{color:var(--muted);font-size:12px}

/* ---------- 列表 ---------- */
.list{display:flex;flex-direction:column;gap:9px;max-height:460px;overflow:auto}
.item{display:flex;align-items:center;gap:12px;padding:11px 13px;border:1px solid var(--line);
  border-radius:11px;background:#fcfdff;transition:.15s}
.item:hover{border-color:#cfd9f2;background:#f8faff}
.item .grow{flex:1;min-width:0}
.item .t{font-weight:600;font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.item .s{font-size:12px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.empty{padding:26px 14px;text-align:center;color:var(--muted);font-size:13px;
  border:1px dashed var(--line);border-radius:11px;background:#fbfcff}
.badge{font-size:11.5px;padding:3px 9px;border-radius:999px;background:#f1f3f9;color:var(--muted);white-space:nowrap}
.badge.red{background:#fdeaea;color:#c02626}
.badge.orange{background:#fdf2e2;color:#b26a04}
.badge.green{background:#e8f7ee;color:#14803c}
.badge.blue{background:var(--pri-soft);color:var(--pri)}
.badge.gray{background:#f1f3f9;color:#6b7590}
.dot{width:8px;height:8px;border-radius:50%;background:var(--pri);flex:0 0 8px}
.dot.red{background:#dc2626}.dot.orange{background:#e0850b}.dot.green{background:#16a34a}.dot.gray{background:#c3cad9}
.mini{font-size:12px;color:var(--muted)}

/* ---------- 学习通 ---------- */
.cx-conn{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.cx-user{display:flex;align-items:center;gap:12px}
.cx-user img{width:46px;height:46px;border-radius:50%;background:#eef2fa;object-fit:cover}
.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:12px;max-height:460px;overflow:auto}
.course-card{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff;transition:.18s}
.course-card:hover{transform:translateY(-2px);box-shadow:0 10px 22px rgba(20,30,60,.09);border-color:#cfd9f2}
.course-card .cover{height:82px;background:linear-gradient(135deg,#e8eeff,#dfe8ff);display:grid;place-items:center;color:#8195c9;font-size:20px}
.course-card .cover img{width:100%;height:100%;object-fit:cover}
.course-card .meta{padding:9px 11px}
.course-card .meta b{display:block;font-size:13px;line-height:1.35;margin-bottom:3px}
.course-card .meta span{font-size:12px;color:var(--muted)}
.form-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:12px}
.field{display:flex;flex-direction:column;gap:5px}
.field label{font-size:12px;color:var(--muted)}
input[type=text],input[type=password],input[type=number],input[type=date],select,textarea{
  border:1px solid var(--line);border-radius:10px;padding:9px 12px;background:#fff;outline:none;transition:.15s;width:100%}
input:focus,select:focus,textarea:focus{border-color:var(--pri);box-shadow:0 0 0 3px rgba(31,87,201,.12)}
.captcha-row{display:flex;gap:10px;align-items:center;margin-top:10px}
.captcha-row img{height:44px;border:1px solid var(--line);border-radius:9px;cursor:pointer;background:#fff}

/* ---------- 课表 ---------- */
.timetable{overflow:auto}
.timetable table{border-collapse:separate;border-spacing:4px;width:100%;min-width:720px}
.timetable th{font-size:12px;color:var(--muted);font-weight:600;padding:6px}
.timetable td{vertical-align:top;padding:0}
.tt-slot{background:#f7f9ff;border:1px solid var(--line);border-radius:9px;min-height:44px;padding:6px 7px;font-size:11.5px}
.tt-slot.has{background:linear-gradient(135deg,#eaf1ff,#e2ebff);border-color:#c9d8f8;color:#1b3f8f}
.tt-slot b{display:block;font-size:12px;line-height:1.3}

/* ---------- AI 会话 ---------- */
.ai-drawer{position:fixed;top:0;right:0;height:100vh;width:392px;background:#fff;border-left:1px solid var(--line);
  box-shadow:-14px 0 40px rgba(20,30,60,.1);transform:translateX(102%);transition:transform .28s cubic-bezier(.4,0,.2,1);
  display:flex;flex-direction:column;z-index:80}
.ai-drawer.open{transform:none}
.ai-head{display:flex;align-items:center;gap:10px;padding:13px 15px;border-bottom:1px solid var(--line)}
.ai-head b{flex:0 0 auto}.ai-head .tag{margin-right:auto}
.tag{font-size:11px;background:var(--pri-soft);color:var(--pri);border-radius:999px;padding:2px 9px}
.chat-thread{flex:1;overflow:auto;padding:15px;display:flex;flex-direction:column;gap:12px;background:#fafbff}
.ai-page-card .chat-thread{height:calc(100vh - 340px);min-height:340px;border:1px solid var(--line);border-radius:12px}
.msg{max-width:88%;padding:10px 13px;border-radius:13px;font-size:13.5px;white-space:pre-wrap;word-break:break-word}
.msg.user{align-self:flex-end;background:var(--pri);color:#fff;border-bottom-right-radius:4px}
.msg.bot{align-self:flex-start;background:#fff;border:1px solid var(--line);border-bottom-left-radius:4px;box-shadow:var(--shadow)}
.msg.bot .acts{margin-top:9px;padding-top:8px;border-top:1px dashed var(--line);display:flex;flex-direction:column;gap:5px}
.msg.bot .act{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:6px}
.msg.bot .act b{color:var(--pri);font-weight:600}
.typing{display:inline-flex;gap:4px;align-items:center}
.typing i{width:6px;height:6px;border-radius:50%;background:#b9c4dd;animation:blink 1.2s infinite}
.typing i:nth-child(2){animation-delay:.18s}.typing i:nth-child(3){animation-delay:.36s}
@keyframes blink{0%,60%,100%{opacity:.35;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}
.chat-input{display:flex;gap:9px;padding:12px 15px;border-top:1px solid var(--line);align-items:flex-end}
.chat-input textarea{resize:none;max-height:110px;border-radius:11px}
.chip-row{display:flex;gap:7px;flex-wrap:wrap;padding:0 15px 10px}
.chip{border:1px solid var(--line);background:#fff;border-radius:999px;padding:5px 11px;font-size:12px;cursor:pointer;color:var(--muted)}
.chip:hover{border-color:#c9d8f8;color:var(--pri);background:var(--pri-soft)}

/* ---------- 智能体：模拟鼠标 / 高亮 / 输入 ---------- */
.ai-cursor{position:fixed;left:-999px;top:-999px;width:22px;height:22px;pointer-events:none;z-index:9999;
  filter:drop-shadow(0 3px 6px rgba(20,30,60,.35))}
.ai-cursor-glyph{display:block;width:22px;height:22px;transition:transform .18s}
.ai-cursor.clicking .ai-cursor-glyph{animation:cursorClick .32s ease}
@keyframes cursorClick{0%{transform:scale(1)}45%{transform:scale(.76)}100%{transform:scale(1)}}
/* 滚轮形态：轻微呼吸 + 下方拖尾，表示"正在滚动页面" */
.ai-cursor[data-mode="scroll"] .ai-cursor-glyph{transform:scale(1.18);animation:scrollBreath .9s ease-in-out infinite}
.ai-cursor.scrolling .ai-cursor-glyph{animation:scrollBreath .5s ease-in-out infinite}
@keyframes scrollBreath{0%,100%{transform:scale(1.14)}50%{transform:scale(1.26)}}
.wheel-particle{position:fixed;font-size:15px;line-height:1;color:var(--pri);pointer-events:none;z-index:9997;
  font-weight:700;animation:wheelUp .7s ease-out forwards}
@keyframes wheelUp{0%{opacity:.95;transform:translate(0,0) scale(.7)}
  100%{opacity:0;transform:translate(0,-26px) scale(1.25)}}
.click-ripple{position:fixed;width:16px;height:16px;border-radius:50%;border:2px solid var(--pri);
  pointer-events:none;z-index:9998;transform:translate(-50%,-50%);animation:ripple .55s ease-out forwards}
@keyframes ripple{0%{opacity:.9;transform:translate(-50%,-50%) scale(.4)}
  100%{opacity:0;transform:translate(-50%,-50%) scale(3.4)}}

/* AI 高亮：脉冲光环，不改变原布局 */
.ai-highlight{position:relative;z-index:40;animation:hlPulse 1.1s ease-in-out 3}
@keyframes hlPulse{0%,100%{box-shadow:0 0 0 0 rgba(31,87,201,0)}
  45%{box-shadow:0 0 0 4px rgba(31,87,201,.35),0 0 0 12px rgba(31,87,201,.12)}}
.ai-hl-tip{position:absolute;z-index:9997;background:#12203f;color:#fff;font-size:12px;padding:6px 11px;
  border-radius:8px;pointer-events:none;white-space:nowrap;box-shadow:0 8px 20px rgba(10,20,50,.28);
  transform:translate(-50%,-140%)}
.ai-hl-tip:after{content:'';position:absolute;left:50%;bottom:-5px;margin-left:-5px;border:5px solid transparent;border-top-color:#12203f}

/* AI 逐字输入时给真实输入框加的视觉反馈 */
.ai-typing-field{position:relative}
.ai-typing-field:after{content:'';position:absolute;right:10px;top:50%;width:2px;height:16px;margin-top:-8px;
  background:var(--pri);animation:caret .8s steps(1) infinite}
@keyframes caret{0%,100%{opacity:1}50%{opacity:0}}

/* ---------- 弹层 / 提示 ---------- */
.modal{position:fixed;inset:0;background:rgba(18,26,48,.42);display:none;place-items:center;z-index:200;padding:20px}
.modal.open{display:grid}
.modal-box{background:#fff;border-radius:16px;padding:20px;max-width:640px;width:100%;max-height:86vh;overflow:auto;
  box-shadow:0 24px 60px rgba(10,20,50,.28)}
.toast-wrap{position:fixed;left:50%;bottom:26px;transform:translateX(-50%);display:flex;flex-direction:column;
  gap:8px;z-index:9000;align-items:center}
.toast{background:#12203f;color:#fff;padding:10px 17px;border-radius:11px;font-size:13px;
  box-shadow:0 10px 26px rgba(10,20,50,.3);animation:toastIn .25s ease}
.toast.err{background:#b4232a}
@keyframes toastIn{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}

/* ---------- 动作清单的执行结果 ---------- */
.msg.bot .act.ok b{color:#14803c}
.msg.bot .act.fail b{color:#b4232a}
.msg.bot .act .mark{font-size:11.5px;margin-left:2px;opacity:.9}
.msg.bot .act.fail .mark{color:#b4232a}

/* ================= 深度解析（自托管专属能力） ================= */
.deep-hint{
  font-size:12px;line-height:1.5;border-radius:8px;padding:8px 10px;margin:2px 0 10px;
  border:1px dashed var(--line);color:var(--muted);background:#f8f9fd;
}
.deep-hint.on{border-color:#bfe0c9;background:#f2fbf5;color:#1c7a45}
.deep-hint.off{border-color:#f0d9b6;background:#fffaf1;color:#9a6412}

/* 浏览器读取中的状态条（跟着模拟光标走） */
.deep-scan{
  position:fixed;left:50%;top:18px;transform:translateX(-50%);z-index:200;
  display:flex;align-items:center;gap:9px;padding:10px 16px;border-radius:12px;
  background:#12203a;color:#fff;font-size:13px;box-shadow:0 12px 34px rgba(12,28,56,.32);
  border:1px solid rgba(255,255,255,.16);overflow:hidden;max-width:92vw;
}
.deep-scan .append-hint,.deep-scan .mini{font-size:11.5px;opacity:.75;white-space:nowrap;
  overflow:hidden;text-overflow:ellipsis;max-width:46vw}
.deep-scan.ok{background:#0f5c33}
.deep-scan.err{background:#8c1f24}
.deep-scan .spinner{
  width:13px;height:13px;border-radius:50%;flex:0 0 auto;
  border:2px solid rgba(255,255,255,.32);border-top-color:#fff;animation:spin .7s linear infinite;
}
.deep-scan.ok .spinner{border:none;background:#fff;animation:none;
  clip-path:polygon(14% 46%,0 60%,40% 100%,100% 22%,86% 8%,38% 72%)}
.deep-scan.err .spinner{border:none;background:#fff;animation:none;
  clip-path:polygon(20% 0,50% 32%,80% 0,100% 20%,70% 50%,100% 80%,80% 100%,50% 68%,20% 100%,0 80%,30% 50%,0 20%)}
@keyframes spin{to{transform:rotate(360deg)}}
.deep-scan .scan-line{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:linear-gradient(90deg,transparent,#6ea8ff,transparent);
  animation:scanmove 1.15s linear infinite;
}
@keyframes scanmove{from{transform:translateX(-100%)}to{transform:translateX(100%)}}

/* 深读结果面板 */
#modalBox .deep-meta{display:flex;gap:6px;flex-wrap:wrap;margin:4px 0 8px}
#modalBox .deep-src{font-size:11.5px;color:var(--muted);word-break:break-all;margin-bottom:10px}
#modalBox h4{margin:14px 0 6px;font-size:13.5px}
#modalBox .deep-text{
  max-height:44vh;overflow:auto;white-space:pre-wrap;word-break:break-word;
  background:#f8f9fd;border:1px solid var(--line);border-radius:10px;
  padding:12px;font-size:12.5px;line-height:1.75;margin:0;
  font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--text);
}
#modalBox .deep-links{display:flex;flex-direction:column;gap:6px;max-height:150px;overflow:auto}
#modalBox .deep-links a{font-size:12.5px;color:#1f57c9;text-decoration:none;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
#modalBox .deep-links a:hover{text-decoration:underline}

/* 「展开全部」行：跟列表里的 item 区分开，不要看起来像一条记录 */
.more-row{width:100%;justify-content:center;border:1px dashed var(--line);
  background:#fbfcff;color:var(--muted);font-size:12.5px;padding:9px}
.more-row:hover{border-color:#cfd9f2;color:var(--pri);background:#f4f7ff}

/* ================= 手机端适配 ================= */
@media (max-width: 900px){
  html,body{font-size:13.5px}
  .topbar{padding:10px 12px;gap:8px;flex-wrap:wrap}
  .topbar h1{font-size:14px}
  .topbar .sub{display:none}
  .logo{width:32px;height:32px;font-size:15px;border-radius:9px}
  .top-actions{gap:6px;flex:1 1 auto;min-width:0;flex-wrap:wrap;justify-content:flex-end}
  .top-actions .pill{padding:5px 9px;font-size:11.5px;max-width:44vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .btn{padding:9px 12px}
  .btn.sm{padding:7px 10px}

  /* 左侧导航变成底部标签栏 */
  /* align-items 必须改成 stretch：.layout 在桌面是 align-items:flex-start，
     改成 column 之后，"交叉轴"变成了水平方向，flex-start 会让 .main 收缩成
     内容宽度（在 768 的平板上只有 483px，右边一大片空白）。 */
  .layout{padding:12px 12px calc(74px + env(safe-area-inset-bottom));flex-direction:column;align-items:stretch;gap:12px}
  .side{position:fixed;left:0;right:0;bottom:0;top:auto;width:100%;flex:0 0 auto;
    flex-direction:row;flex-wrap:nowrap;gap:2px;border-radius:0;border:0;border-top:1px solid var(--line);
    padding:6px 6px calc(6px + env(safe-area-inset-bottom));overflow-x:auto;overflow-y:hidden;z-index:70;
    box-shadow:0 -4px 18px rgba(20,30,60,.07);-webkit-overflow-scrolling:touch}
  .nav-item{flex:1 1 0;min-width:52px;flex-direction:column;gap:3px;padding:6px 2px;
    font-size:10.5px;text-align:center;justify-content:center;border-radius:9px;white-space:nowrap}
  .nav-item span{font-size:17px;line-height:1}

  /* 卡片 / 栅格 */
  .card{padding:13px 13px;border-radius:12px}
  .card h2{font-size:13.5px;flex-wrap:wrap;gap:8px}
  /* 按钮改成「右对齐 + 按内容宽度」，不再铺满整行 ——
     只有一两个按钮的卡片（例如课表只有「同步课表」）铺满会显得很空。 */
  .head-actions{width:100%;justify-content:flex-end}
  .head-actions .btn{flex:0 1 auto;text-align:center}
  .stat-row{grid-template-columns:repeat(2,1fr);gap:10px}
  .stat{padding:11px 12px}
  .stat b{font-size:19px}
  .grid-2{grid-template-columns:1fr;gap:12px}
  .course-grid{grid-template-columns:repeat(2,1fr);gap:9px}
  .course-card .cover{height:64px}
  .list{max-height:none}
  .course-grid{max-height:none}
  .item{padding:10px 11px;gap:9px;flex-wrap:wrap}
  .item .t{white-space:normal;line-height:1.4}
  .item .s{white-space:normal}

  /* AI 抽屉在手机上占满整屏 */
  .ai-drawer{width:100vw;border-left:0}
  .ai-head{padding:11px 13px}
  .chat-thread{padding:12px}
  .msg{max-width:94%}
  .ai-page-card .chat-thread{height:calc(100dvh - 300px);min-height:280px}
  .chip-row{padding:0 12px 9px;overflow-x:auto;flex-wrap:nowrap;
    -webkit-overflow-scrolling:touch}
  .chip{flex:0 0 auto}

  /* 表单：16px 可以避免 iOS 聚焦时自动放大 */
  input[type=text],input[type=password],input[type=number],input[type=date],select,textarea{font-size:16px;padding:10px 12px}
  .form-row{gap:8px}
  .field{min-width:100%}
  .modal{padding:0;align-items:flex-end}
  .modal-box{max-width:none;width:100%;max-height:88vh;border-radius:16px 16px 0 0;padding:18px}
  .modal-box h2{font-size:15px}
  .captcha-row img{height:40px}

  .timetable{margin:0 -6px}
  .toast-wrap{bottom:calc(78px + env(safe-area-inset-bottom));width:92%}
  .ai-hl-tip{max-width:80vw;white-space:normal;text-align:center}
}

/* ================= 导航新增：两个独立页面的链接项 ================= */
/* 「画面」「日志」是 <a> 而不是 <button>，要清掉链接默认下划线并沿用同一套配色 */
a.nav-item{text-decoration:none;color:var(--muted);cursor:pointer}
a.nav-item:visited{color:var(--muted)}

/* ================= 课表：支持同一时段排多门课 ================= */
.tt-cell{display:flex;flex-direction:column;gap:4px}
.tt-slot .tt-meta{display:block;font-size:10.5px;opacity:.78;margin-top:2px;font-weight:400;line-height:1.35}
.tt-slot .tt-note{display:block;font-size:10px;opacity:.62;margin-top:1px;line-height:1.3}
.tt-slot.tt-tight{min-height:0;padding:5px 6px}

/* 课表在窄屏必然要横向滚动（格子太窄的话课程名会被挤压换行成一坨），
   所以把「节次」那一列钉在左边，滑动时不会失去行参照。 */
.timetable th:first-child{position:sticky;left:0;z-index:2;background:var(--card);box-shadow:1px 0 0 var(--line)}
.timetable td:first-child{position:sticky;left:0;z-index:1;background:var(--card)}

/* ================= 学习通扩展卡片 ================= */
#cxExamList .t,#cxGradeList .t,#cxSignList .t{font-weight:600}
#cxExamList .badge,#cxGradeList .badge{font-variant-numeric:tabular-nums}

/* 触屏设备不显示"模拟鼠标"的缩放动效，避免误以为卡顿；但保留移动轨迹 */
@media (pointer: coarse){
  .ai-cursor{filter:drop-shadow(0 2px 5px rgba(20,30,60,.4));transform:scale(1.15)}
}

@media (max-width: 900px){
  /* 底部标签栏从 6 项涨到 8 项：必须允许每一项收缩到内容宽度以下，
     否则 390px 宽的屏会被撑出横向滚动（.side 虽然有 overflow-x:auto，
     但那意味着用户得左右划才能看到「日志」）。 */
  .nav-item{min-width:0;flex:1 1 0;font-size:10px;padding:6px 1px;gap:2px}
  .nav-item span{font-size:16px}
}

@media (max-width: 380px){
  /* 320px（iPhone SE 一代 / 老安卓）上 6 个标签 + 顶栏按钮最容易挤爆，
     这里把字号和最小宽度再收紧一档，保证不出现横向滚动 */
  .nav-item{min-width:46px;font-size:9.5px;padding:6px 1px}
  .nav-item span{font-size:15px}
  .stat b{font-size:17px}
  .topbar{padding:9px 10px}
  .top-actions{gap:5px}
  .top-actions .pill{max-width:38vw;font-size:11px;padding:5px 8px}
  .top-actions .btn{padding:8px 9px;font-size:12px}
  .logo{width:28px;height:28px;font-size:13px}
  .topbar h1{font-size:13px}
  .card{padding:11px 11px}
  .course-grid{grid-template-columns:1fr}
}