*{box-sizing:border-box;margin:0;padding:0}
  body{font-family:"Microsoft YaHei","PingFang SC",sans-serif;background:#f5f7fa;color:#2c3e50;line-height:1.7}
  .topbar{background:linear-gradient(135deg,#312E81,#4F46E5);color:#fff;padding:14px 24px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:20}
  .topbar .brand{font-size:17px;font-weight:800;letter-spacing:1px}
  .topbar .user{font-size:13px;opacity:.95;display:flex;align-items:center;gap:10px}
  .topbar .user button{background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.4);color:#fff;border-radius:20px;padding:4px 14px;cursor:pointer;font-size:12px}
  .wrap{max-width:1280px;margin:0 auto;padding:20px 24px 60px}
  .hero{background:linear-gradient(135deg,#1E1B4B,#312E81 40%,#6D28D9 80%,#7C3AED);color:#fff;border-radius:16px;padding:28px 26px;margin-bottom:16px;box-shadow:0 8px 24px rgba(49,46,129,.18);position:relative;overflow:hidden}
  .hero::after{content:"";position:absolute;right:-40px;top:-40px;width:180px;height:180px;border-radius:50%;background:rgba(255,255,255,.06)}
  .hero h1{font-size:22px} .hero p{color:#fff;opacity:.92;margin-top:6px;font-size:13.5px;font-weight:600}
  section{background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:20px 20px 16px;margin-bottom:14px}
  section h2{font-size:17px;color:#312E81;border-left:5px solid #4F46E5;padding-left:10px;margin-bottom:12px}
  .grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px}
  .card{border:1px solid #e2e8f0;border-radius:14px;padding:18px;background:#fff;box-shadow:0 1px 4px rgba(49,46,129,.05);transition:box-shadow .2s,transform .15s}
  .card:hover{box-shadow:0 6px 20px rgba(49,46,129,.12);transform:translateY(-2px)}
  .card h3{font-size:15px;color:#312E81;margin-bottom:6px}
  .card p{font-size:12.5px;color:#64748b;margin-bottom:10px}
  .btn{display:inline-block;background:linear-gradient(135deg,#4F46E5,#6D28D9);color:#fff;border:none;border-radius:8px;padding:7px 16px;font-size:13px;cursor:pointer;text-decoration:none;transition:opacity .15s}
  .btn:hover{opacity:.88}
  .btn:active{transform:scale(.97)}
  .btn.ghost{background:#eef2f9;color:#312E81;border:1px solid #dbe4f0}
  .btn.sm{padding:4px 10px;font-size:12px}
  .btn.danger{background:#fee2e2;color:#b91c1c;border:1px solid #fecaca}
  input,select,textarea{width:100%;padding:8px 10px;border:1px solid #d1d9e8;border-radius:8px;font-size:13px;margin:4px 0;font-family:inherit}
  .row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
  .muted{color:#94a3b8;font-size:12px}
  .login{max-width:420px;margin:80px auto;background:#fff;border:1px solid #e2e8f0;border-radius:18px;padding:36px 32px;box-shadow:0 12px 40px rgba(49,46,129,.12)}
  .login h1::before{content:"🎓 ";font-size:26px}
  .login h1{font-size:20px;color:#312E81;text-align:center;margin-bottom:6px}
  .login .sub{text-align:center;color:#94a3b8;font-size:13px;margin-bottom:20px}
  .err{color:#dc2626;font-size:12.5px;margin-top:8px}
  .chat{display:flex;flex-direction:column;height:420px;border:1px solid #e2e8f0;border-radius:12px;overflow:hidden}
  .chat .msgs{flex:1;overflow-y:auto;padding:14px;background:#f8fafc}
  .chat .msg{margin-bottom:10px;max-width:80%}
  .chat .msg.user{margin-left:auto;background:#4F46E5;color:#fff;border-radius:12px 12px 2px 12px;padding:9px 13px;font-size:13.5px}
  .chat .msg.ai{background:#fff;border:1px solid #e2e8f0;border-radius:12px 12px 12px 2px;padding:10px 14px;font-size:13.5px;line-height:1.75;word-break:break-word}
  .chat .msg.ai strong{color:#312E81;font-weight:700}
  .chat .msg.ai p{margin:4px 0}
  .chat .msg.ai hr{margin:8px 0}
  .chat .input{display:flex;gap:8px;padding:10px;background:#fff;border-top:1px solid #e2e8f0}
  .chat .input input{flex:1;margin:0}
  .material-item{display:flex;align-items:center;gap:10px;padding:9px 12px;border:1px solid #e2e8f0;border-radius:10px;margin-bottom:8px;background:#fff}
  .material-item .t{flex:1;font-size:13.5px}
  .material-item .type{font-size:11px;background:#eef2f9;color:#4F46E5;padding:2px 8px;border-radius:10px}
  table{width:100%;border-collapse:collapse;font-size:12.8px;margin:8px 0}
  th{background:#312E81;color:#fff;padding:7px 10px;text-align:left;font-weight:bold;border:1px solid #312E81}
  td{border:1px solid #e2e8f0;padding:6px 10px}
  tr:nth-child(even) td{background:#f8fafc}
  /* ===== 品牌展示页（登录前）===== */
  #loginPage{min-height:100vh;background:#f5f7fa}
  .land-hero{background:linear-gradient(135deg,#1E1B4B,#312E81 40%,#6D28D9 80%,#7C3AED);color:#fff;text-align:center;padding:64px 20px 56px;position:relative;overflow:hidden}
  .land-hero::after{content:"";position:absolute;right:-60px;top:-60px;width:260px;height:260px;border-radius:50%;background:rgba(255,255,255,.06)}
  .land-logo{font-size:15px;letter-spacing:2px;opacity:.85;margin-bottom:16px}
  .land-title{font-size:46px;font-weight:900;letter-spacing:3px;color:#fff}
  .land-sub{color:#fff;opacity:.95;margin-top:14px;font-size:17px;font-weight:600}
  .land-slogan{display:inline-block;margin-top:18px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.35);border-radius:22px;padding:7px 22px;font-size:14.5px;font-weight:700;color:#fff;letter-spacing:.5px}
  .land-kpis{max-width:1000px;margin:34px auto 0;padding:0 16px;display:flex;flex-wrap:wrap;gap:12px}
  .land-kpi{flex:1;min-width:170px;background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:16px 12px;text-align:center}
  .land-kpi .v{font-size:21px;font-weight:900;color:#4F46E5}
  .land-kpi .l{font-size:12px;color:#64748b;margin-top:4px}
  .land-desc{margin-top:8px;font-size:13.5px;opacity:.75}
  .land-login{max-width:400px;margin:-30px auto 0;position:relative;background:#fff;border-radius:18px;padding:28px 28px 24px;box-shadow:0 14px 44px rgba(49,46,129,.16);border:1px solid #e2e8f0}
  .land-login-title{font-size:16px;font-weight:800;color:#312E81;text-align:center;margin-bottom:14px}
  .land-login input{width:100%;padding:11px 12px;border:1px solid #d1d9e8;border-radius:10px;font-size:14px;margin:6px 0;font-family:inherit;box-sizing:border-box}
  .land-login input:focus{outline:none;border-color:#4F46E5;box-shadow:0 0 0 3px rgba(79,70,229,.12)}
  .land-cards{max-width:1080px;margin:40px auto 0;padding:0 16px;display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
  .land-card{background:#fff;border:1px solid #e2e8f0;border-radius:14px;padding:26px 20px;text-align:center;transition:box-shadow .2s,transform .15s}
  .land-card:hover{box-shadow:0 8px 24px rgba(49,46,129,.12);transform:translateY(-3px)}
  .land-card .ico{font-size:36px}
  .land-card h3{font-size:16px;color:#312E81;margin:12px 0 6px}
  .land-card p{font-size:12.5px;color:#64748b;line-height:1.7}
  .land-footer{text-align:center;color:#94a3b8;font-size:12px;padding:44px 0 40px}
  @media(max-width:768px){
    .land-hero{padding:46px 16px 44px}
    .land-title{font-size:30px}
    .land-login{margin-top:-24px}
  }
  .hidden{display:none}
  /* 分段切换控件（2026-08-16 老板反馈单选行排版难看 → 胶囊切换） */
  .seg{display:flex;background:#eef2f9;border:1px solid #e2e8f0;border-radius:10px;padding:3px;gap:3px}
  .seg-item{flex:1;text-align:center;padding:8px 6px;font-size:13px;font-weight:600;border-radius:8px;color:#64748b;cursor:pointer;user-select:none;transition:background .15s,color .15s,box-shadow .15s;white-space:nowrap}
  .seg-item.active{background:#fff;color:#4F46E5;box-shadow:0 1px 4px rgba(49,46,129,.18)}
  /* 教材预览弹层（2026-08-16 老板需求：教材管理可点击浏览文档） */
  #cwPreviewOverlay{position:fixed;inset:0;background:rgba(15,23,42,.55);z-index:100;display:none;align-items:center;justify-content:center;padding:16px}
  #cwPreviewBox{background:#fff;border-radius:14px;box-shadow:0 20px 60px rgba(15,23,42,.35);width:min(980px,100%);max-height:92vh;display:flex;flex-direction:column;overflow:hidden}
  #cwPreviewHead{display:flex;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid #eef2f9;background:#f8fafc}
  #cwPreviewTitle{flex:1;font-size:14px;font-weight:700;color:#312E81;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  #cwPreviewBody{flex:1;min-height:0;padding:12px;background:#f1f5f9}
  #cwPreviewBody iframe{width:100%;height:100%;min-height:60vh;border:1px solid #e2e8f0;border-radius:10px;background:#fff}
  #cwPreviewBody video{width:100%;max-height:70vh;background:#000;border-radius:10px}
  #cwPreviewFoot{display:flex;gap:10px;justify-content:flex-end;padding:10px 16px;border-top:1px solid #eef2f9}
  /* 课程详情/章节页打开时：外层 section 去白卡（.detail-open 可逆，返回列表移除恢复；2026-08-16） */
  section.detail-open{padding:0 !important;background:transparent !important;border:none !important;border-radius:0 !important;margin-bottom:0 !important}
  /* ===== 手机端适配（2026-08-14）===== */
  @media (max-width: 768px){
    .wrap{padding:12px 10px 40px}
    .hero{padding:18px 16px}
    .hero h1{font-size:19px}
    .grid{grid-template-columns:1fr}
    .land-cards{grid-template-columns:repeat(2,1fr)}
    .chat{height:380px}
    .chat .msg{max-width:92%}
    .topbar{padding:10px 14px}
    .topbar .brand{font-size:15px}
    .row{flex-direction:column;align-items:stretch}
    .row .btn{width:100%;text-align:center}
    /* 老师端形象/声音单选行：内联 nowrap 在手机端改为可换行（2026-08-16 老板反馈声音配置一行溢出） */
    .row[style*="flex-wrap:nowrap"]{flex-wrap:wrap !important;white-space:normal !important}
    .login{margin:40px auto;padding:24px;border-radius:14px}
    input,select,textarea{font-size:14px}
    .material-item{flex-wrap:wrap}
    .material-item video{width:100%}
    table{font-size:11.5px}
    th,td{padding:5px 6px}
    .btn{width:auto}
    .chat .input{flex-wrap:wrap}
    .chat .input input{min-width:140px}
    /* 课程页/章节页：左右两栏手机堆叠为单栏 */
    .chapter-flex,.course-flex{flex-direction:column !important}
    .chapter-left,.course-left{width:100% !important;max-width:100% !important;position:static !important;order:1}
    .chapter-right,.course-right{width:100% !important;order:2}
    .course-title{font-size:20px !important;line-height:1.3 !important}
    /* 2026-09-06：以下三条旧规则针对历史 course-head（已不存在，仅剩学生课程 HERO），会以 !important 破坏新 HERO 移动端样式 → 注释停用
    .course-head{padding:4px 0 10px !important;margin-bottom:10px !important;border-bottom:1px solid #eef2f9 !important}
    .course-head div[style*="font-size:15px"]{font-size:13px !important;margin-top:4px !important;line-height:1.5 !important}
    .course-head div[style*="font-size:12.5px"]{font-size:12px !important;margin-top:3px !important;line-height:1.4 !important}
    */
    .course-breadcrumb{font-size:12px !important}
  }
  @media (max-width: 400px){
    .topbar .user button{padding:3px 10px;font-size:11px}
    .land-cards{grid-template-columns:1fr}
  }
  /* ===== 老师端：左侧菜单 + 右侧内容 两栏布局（2026-08-15 老板需求）=====
     课程详情页 cd-* 复用同一套样式（2026-08-15 老板需求：学生端课程页左侧导航） */
  .tea-layout{display:flex;gap:16px;align-items:flex-start}
  .tea-side,.cd-side{flex:0 0 196px;position:sticky;top:70px;background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:10px;box-shadow:0 1px 4px rgba(49,46,129,.05)}
  .tea-menu-title,.cd-menu-title{font-size:11px;color:#94a3b8;font-weight:700;letter-spacing:2px;padding:6px 10px 8px}
  .tea-menu-item,.cd-menu-item{display:flex;align-items:center;gap:8px;padding:11px 12px;border-radius:9px;cursor:pointer;font-size:13.5px;color:#475569;margin-bottom:4px;transition:background .15s,color .15s;user-select:none}
  .tea-menu-item:hover,.cd-menu-item:hover{background:#f1f5f9;color:#312E81}
  .tea-menu-item.active,.cd-menu-item.active{background:linear-gradient(135deg,#4F46E5,#6D28D9);color:#fff;font-weight:700;box-shadow:0 3px 10px rgba(79,70,229,.28)}
  .tea-main,.cd-main{flex:1;min-width:0}
  .tea-panel,.cd-panel{animation:fadeIn .2s ease}
  @keyframes fadeIn{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
  @media (max-width: 900px){
    .tea-layout{flex-direction:column;align-items:stretch}
    .tea-side,.cd-side{flex:none;width:100%;position:static}
    .tea-main,.cd-main{width:100%;min-width:0}
    .tea-menu,.cd-menu{display:flex;overflow-x:auto;gap:6px;padding-bottom:2px;padding-right:20px;padding-left:20px;scrollbar-width:none;-webkit-overflow-scrolling:touch}
    .tea-menu::-webkit-scrollbar,.cd-menu::-webkit-scrollbar{display:none}
    .tea-menu-item,.cd-menu-item{white-space:nowrap;margin-bottom:0}
    /* 横向菜单：左右滚动箭头提示（v2 2026-08-16 老板反馈渐变看不清 → 紫色圆箭头） */
    .tea-side,.cd-side{position:relative;top:auto}
    .tea-side::before,.tea-side::after,.cd-side::before,.cd-side::after{
      content:"";position:absolute;top:calc(var(--menu-top,46px) + 12px);width:22px;height:22px;border-radius:50%;
      display:flex;align-items:center;justify-content:center;
      background:rgba(79,70,229,.92);color:#fff;font-size:13px;font-weight:900;line-height:1;
      box-shadow:0 1px 4px rgba(49,46,129,.35);
      pointer-events:none;z-index:4;opacity:0;transition:opacity .2s
    }
    .tea-side::before,.cd-side::before{content:"❮";left:2px}
    .tea-side::after,.cd-side::after{content:"❯";right:2px}
    .tea-side.scrim-l::before,.cd-side.scrim-l::before{opacity:1}
    .tea-side.scrim-r::after,.cd-side.scrim-r::after{opacity:1}
    /* 课程详情/章节页：去掉 section+灰卡 双层嵌套，内容直接铺开（2026-08-16 手机适配） */
    .cd-main section{background:transparent;border:none;border-radius:0;padding:0 0 6px;margin-bottom:8px}
    .cd-main section h2{font-size:16px;margin-bottom:8px}
    .cd-main section > div[style*="background:#f8fafc"]{background:transparent !important;border:none !important;border-radius:0 !important;padding:2px 0 !important;box-shadow:none !important}
  }
/* ===== 学生端移动版（2026-09-05 底部3Tab试点；2026-09-06 视觉升级：SVG Tab/毛玻璃/HERO纵深/胶囊吸顶，评审 UI P0/P1）===== */
/* —— 底部 Tabbar：SVG 线性图标可着色 + 毛玻璃 + 顶部发丝线 + 安全区（评审 UI P0/P1）—— */
#stuTabbar{display:none;position:fixed;bottom:0;left:50%;transform:translateX(-50%);width:100%;max-width:480px;z-index:150;background:rgba(255,255,255,.92);-webkit-backdrop-filter:blur(16px) saturate(1.5);backdrop-filter:blur(16px) saturate(1.5);border-top:1px solid rgba(15,23,42,.07);box-shadow:0 -8px 24px rgba(15,23,42,.07);padding-bottom:env(safe-area-inset-bottom)}
#stuTabbar .tab{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-height:56px;padding:7px 0 5px;font-size:11px;color:#8a98a3;cursor:pointer;user-select:none;-webkit-tap-highlight-color:transparent;transition:color .18s}
#stuTabbar .tab .ico{display:block;line-height:1}
#stuTabbar .tab .ico svg{width:24px;height:24px;display:block;stroke:currentColor;stroke-width:1.8;fill:none;stroke-linecap:round;stroke-linejoin:round;transition:transform .15s}
#stuTabbar .tab:active .ico svg{transform:scale(.9)}
#stuTabbar .tab.active{color:#4F46E5;font-weight:700}
#stuTabbar .tab.active .ico svg{stroke-width:2.5}
/* —— 课程 HERO 纵深层次（评审 UI P0：渐变加强+装饰光斑+内容浮层；桌面同样受益）—— */
#studentPanel .course-head{position:relative;overflow:hidden;box-shadow:inset 0 1px 0 rgba(255,255,255,.92),0 20px 44px -24px rgba(79,70,229,.5)}
#studentPanel .course-head::before{content:"";position:absolute;left:-90px;top:-140px;width:320px;height:320px;border-radius:50%;background:radial-gradient(circle,rgba(129,140,248,.28),transparent 62%);pointer-events:none}
#studentPanel .course-head::after{content:"";position:absolute;right:-80px;bottom:-160px;width:300px;height:300px;border-radius:50%;background:radial-gradient(circle,rgba(196,181,253,.38),transparent 62%);pointer-events:none}
#studentPanel .course-head > div{position:relative;z-index:1}
.ch-head{width:100%}
.ch-body{display:flex;gap:22px;align-items:flex-start}
.ch-main{flex:1;min-width:0}
/* 🔊 听老师欢迎：44px 热区 + 播放态（评审 UI P0/P1） */
#teacher-welcome-btn{min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:6px}
#teacher-welcome-btn.playing .wi{display:inline-block;animation:wiSonar 1.1s ease-in-out infinite}
@keyframes wiSonar{0%,100%{transform:scale(1)}50%{transform:scale(1.3)}}
/* 「更多」控件桌面版隐藏（移动端胶囊内启用） */
#stuCourses .cd-more-btn,#stuCourses .cd-more-pop{display:none!important}
#stuCourses .cd-menu-item.cd-home-btn:hover{background:#e0e7ff!important;color:#312E81}
@media (max-width:768px){
  #studentPanel.stu-mobile{max-width:480px;margin:0 auto;padding-bottom:calc(96px + env(safe-area-inset-bottom))}
  #studentPanel.stu-mobile .tea-side{display:none!important}
  #studentPanel.stu-mobile .tea-main{width:100%!important;flex:1!important}
  /* —— 课程顶部胶囊：吸顶毛玻璃+发丝线+两端渐隐+选中高亮（评审 UI P0/P1）—— */
  #studentPanel.stu-mobile .cd-side{position:sticky;top:52px;z-index:70;flex:none;width:100%;background:transparent;border:none;box-shadow:none;border-radius:0;padding:0;margin-bottom:2px}
  #studentPanel.stu-mobile .cd-side .cd-menu-title{display:none}
  #studentPanel.stu-mobile .cd-side .cd-menu{display:flex;gap:8px;overflow-x:auto;padding:10px 26px 12px 24px;scrollbar-width:none;-webkit-overflow-scrolling:touch;-webkit-mask-image:linear-gradient(90deg,transparent 0,#000 20px,#000 calc(100% - 20px),transparent 100%);mask-image:linear-gradient(90deg,transparent 0,#000 20px,#000 calc(100% - 20px),transparent 100%)}
  #studentPanel.stu-mobile .cd-side .cd-menu::-webkit-scrollbar{display:none}
  #studentPanel.stu-mobile .cd-menu-item{flex:none;white-space:nowrap;background:#fff;border:1px solid #e2e8f0;color:#475569;font-size:13px;font-weight:600;border-radius:999px;padding:11px 16px;margin:0;min-height:40px;display:flex;align-items:center;gap:5px;box-shadow:0 1px 3px rgba(15,23,42,.07);transition:background .15s,color .15s,border-color .15s,box-shadow .15s}
  #studentPanel.stu-mobile .cd-menu-item:active{transform:scale(.97)}
  #studentPanel.stu-mobile .cd-menu-item.active{background:linear-gradient(135deg,#4F46E5,#6D28D9);color:#fff;border-color:transparent;box-shadow:0 5px 14px rgba(79,70,229,.35)}
  #studentPanel.stu-mobile .cd-menu-item[data-more]{display:none!important} /* 低频项收入「更多」 */
  #studentPanel.stu-mobile .cd-menu-item.cd-more-btn{margin-left:auto;background:#f8fafc;border-style:dashed;border-color:#cbd5e1;color:#64748b}
  #studentPanel.stu-mobile .cd-side::before,#studentPanel.stu-mobile .cd-side::after{display:none!important} /* 隐藏旧版圆箭头 */
  #studentPanel.stu-mobile .cd-side.cd-stuck{background:rgba(255,255,255,.88);-webkit-backdrop-filter:blur(16px) saturate(1.4);backdrop-filter:blur(16px) saturate(1.4);border-bottom:1px solid rgba(15,23,42,.07);box-shadow:0 8px 18px -10px rgba(15,23,42,.16);padding:2px 0 0;border-radius:0 0 18px 18px}
  /* 「⋯ 更多」弹出层（讨论区/帮助 等低频可达入口） */
  #studentPanel.stu-mobile .cd-more-btn{display:flex!important}
  #studentPanel.stu-mobile .cd-more-pop{display:none!important;position:absolute;top:calc(100% - 6px);right:10px;min-width:168px;background:#fff;border:1px solid #e2e8f0;border-radius:14px;box-shadow:0 16px 40px rgba(15,23,42,.18);z-index:95;padding:6px;animation:fadeIn .15s ease}
  #studentPanel.stu-mobile .cd-more-pop.show{display:block!important}
  #studentPanel.stu-mobile .cd-more-pop > div{padding:12px 14px;border-radius:9px;font-size:13.5px;color:#334155;cursor:pointer;display:flex;align-items:center;gap:8px;font-weight:600}
  #studentPanel.stu-mobile .cd-more-pop > div:active{background:#eef2ff}
  /* —— 首页 hero 移动端收紧 —— */
  #studentPanel.stu-mobile #stuHero{padding:16px 15px;border-radius:16px}
  #studentPanel.stu-mobile #stuHero h1{font-size:18px}
  #studentPanel.stu-mobile #stuHero p{font-size:11.5px;margin-top:3px}
  /* —— HERO 纵深：移动单列叠压、立像入卡同底、课名负字距（评审 UI P0/P1；inline 样式高优先级 → 统一 !important）—— */
  #studentPanel.stu-mobile .course-head{flex-direction:column!important;align-items:stretch!important;text-align:left!important;padding:16px 14px 14px!important;gap:12px!important;border-radius:20px!important;border-color:rgba(124,58,237,.14)!important}
  #studentPanel.stu-mobile .course-head > div:first-child{width:100%!important;flex:none!important;min-width:0!important;align-items:flex-start!important}
  #studentPanel.stu-mobile .ch-body{gap:12px!important}
  #studentPanel.stu-mobile .course-head .course-title{font-size:22px!important;width:100%!important;letter-spacing:-.02em!important;line-height:1.3!important;white-space:normal!important;word-break:break-word!important;overflow-wrap:anywhere!important}
  #studentPanel.stu-mobile .course-head > div:first-child > div[style*="font-size:14px"]{font-size:12.5px!important;margin-top:6px!important;line-height:1.55!important;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
  #studentPanel.stu-mobile .course-head [style*="font-size:12px;color:#7c86a1"]{font-size:11px!important;margin-top:8px!important;gap:8px 12px!important}
  #studentPanel.stu-mobile .course-head [style*="margin-top:16px"]{margin-top:10px!important;gap:8px!important}
  #studentPanel.stu-mobile #course-teacher-intro{font-size:11px!important;margin-top:4px!important}
  #studentPanel.stu-mobile #hero-teacher-pic span{width:34px!important;height:34px!important;font-size:15px!important;right:6px!important;bottom:6px!important}
  #studentPanel.stu-mobile #teacher-welcome-btn{min-height:44px!important;padding:0 15px!important;border-radius:22px!important}
  #studentPanel.stu-mobile .course-breadcrumb{font-size:11.5px!important;margin-bottom:10px!important}
  /* —— 首页今日任务台（2026-09-06 评审 PM/教育 P0）—— */
  #studentPanel.stu-mobile #stuHero{display:none}
  #studentPanel.stu-mobile #stu-dash-courses{display:flex;overflow-x:auto;gap:12px;padding:2px 2px 10px;scrollbar-width:none}
  #studentPanel.stu-mobile #stu-dash-courses::-webkit-scrollbar{display:none}
  #studentPanel.stu-mobile #stu-dash-courses .card{flex:0 0 248px}
}
/* —— 今日任务台通用样式（桌面+移动）—— */
.taskdash{display:flex;flex-direction:column;gap:14px}
#stu-dash-courses{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.td-sec{background:#fff;border:1px solid #e2e8f0;border-radius:16px;padding:14px}
.td-row{display:flex;align-items:center;gap:11px;background:#fff;border:1px solid #eef2f9;border-radius:13px;padding:12px 13px;margin-bottom:8px;cursor:pointer;transition:box-shadow .15s,transform .12s;box-shadow:0 1px 3px rgba(15,23,42,.04)}
.td-row:active{transform:scale(.99)}
.td-row:hover{box-shadow:0 4px 14px rgba(15,23,42,.09)}
.td-row .td-ic{font-size:19px;line-height:1}
.td-row .td-bd{flex:1;min-width:0}
.td-row .td-bd b{font-size:13px;color:#334155;display:block}
.td-row .td-meta{font-size:11.5px;color:#94a3b8;margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.td-row .td-go{flex:none;font-size:12px;color:#4F46E5;font-weight:800;background:#eef2ff;border-radius:20px;padding:6px 12px}
.td-row.td-urgent{background:#fef2f2;border-color:#fecaca}
.td-row.td-urgent .td-bd b{color:#b91c1c}
.td-row.td-urgent .td-go{background:#fee2e2;color:#b91c1c}
.td-row.td-due{background:#fffbeb;border-color:#fde68a}
.td-row.td-due .td-bd b{color:#92400e}
.td-row.td-due .td-go{background:#fef3c7;color:#92400e}
.td-row.td-ok{background:#f0fdf4;border-color:#bbf7d0}
.td-row.td-ok .td-bd b{color:#166534}
.td-row.td-ok .td-go{background:#dcfce7;color:#166534}
.td-row.td-wait{opacity:.92}
.ckcd{font-variant-numeric:tabular-nums;letter-spacing:.5px}
/* —— 全站签到横幅 + 红点（2026-09-06 评审教育/PM P0：移动端横幅倒计时+角标）—— */
#stuCkBanner{display:none}
.ckdot{position:absolute;top:4px;right:5px;width:9px;height:9px;border-radius:50%;background:#ef4444;box-shadow:0 0 0 2px rgba(255,255,255,.95);display:none;pointer-events:none}
.ckdot.on{display:block}
#stuTabbar .tab{position:relative}
/* 轻提示 toast */
#appToast{position:fixed;top:76px;left:50%;transform:translateX(-50%);z-index:220;background:rgba(17,24,39,.92);color:#fff;font-size:13px;font-weight:700;border-radius:22px;padding:10px 20px;box-shadow:0 10px 26px rgba(0,0,0,.25);display:none;max-width:88vw;text-align:center}
@media (max-width:768px){
  #stuCkBanner.show{display:flex;position:fixed;bottom:calc(62px + env(safe-area-inset-bottom));left:50%;transform:translateX(-50%);width:calc(100% - 20px);max-width:460px;z-index:160;align-items:center;gap:10px;flex-wrap:wrap;background:linear-gradient(135deg,#312E81,#4F46E5);color:#fff;border-radius:16px;padding:10px 14px;box-shadow:0 14px 34px rgba(49,46,129,.4);animation:fadeIn .2s ease}
  #stuCkBanner.show .ckb-t{flex:1;min-width:150px;font-size:12.5px;font-weight:700;line-height:1.45}
  #stuCkBanner.show .ckb-btn{flex:none;background:#fff;color:#312E81;border:none;border-radius:20px;min-height:40px;padding:0 18px;font-weight:900;font-size:13px;cursor:pointer}
  #stuCkBanner.show .ckb-x{flex:none;width:26px;height:26px;border-radius:50%;background:rgba(255,255,255,.16);color:#fff;border:none;font-size:12px;line-height:1;cursor:pointer}
}
/* ===== 沉浸式在线答疑（2026-09-20 老板需求：老师形象放大至整屏 + 对话漂浮下半屏 + 磨砂玻璃自 55% 往下逐步清晰）===== */
.qa-launch{display:flex;gap:14px;align-items:center;background:linear-gradient(135deg,#eef2ff,#faf5ff);border:1px solid #e0e7ff;border-radius:12px;padding:12px 14px}
.qa-launch .qa-lk-btn{flex:none;background:linear-gradient(135deg,#4F46E5,#7c3aed);color:#fff;border:none;border-radius:20px;min-height:38px;padding:0 16px;font-size:13px;font-weight:700;cursor:pointer}
.qa-launch .qa-lk-btn:active{transform:scale(.96)}
#qaImmersive{position:fixed;inset:0;z-index:320;display:none;background:#0b1020}
#qaImmersive.on{display:block}
#qaImmersive .qa-inner{position:relative;width:100%;height:100dvh;height:100vh;margin:0 auto;overflow:hidden;background:#0b1020;color:#0f172a}
#qaImmersive .qa-photo{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:50% 24%;user-select:none;-webkit-user-drag:none;transition:transform .45s cubic-bezier(.2,.7,.2,1)}
#qaImmersive.zoom .qa-photo{transform:scale(1.06)}
#qaImmersive .qa-ph{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:120px;background:linear-gradient(160deg,#312E81,#4F46E5 55%,#0f172a)}
#qaImmersive .qa-frostwrap{position:absolute;inset:0;pointer-events:none;display:none;
  -webkit-mask-image:linear-gradient(to bottom,rgba(0,0,0,1) 53%,rgba(0,0,0,.88) 62%,rgba(0,0,0,.46) 74%,rgba(0,0,0,.14) 86%,rgba(0,0,0,0) 96%);
          mask-image:linear-gradient(to bottom,rgba(0,0,0,1) 53%,rgba(0,0,0,.88) 62%,rgba(0,0,0,.46) 74%,rgba(0,0,0,.14) 86%,rgba(0,0,0,0) 96%)}
#qaImmersive .qa-frostwrap img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:50% 24%;filter:blur(20px) saturate(1.1);transform:scale(1.1)}
#qaImmersive .qa-glass{position:absolute;left:0;right:0;top:55%;bottom:0;pointer-events:none}
#qaImmersive .qa-glass>i{position:absolute;inset:0;display:block}
#qaImmersive .qa-glass .qg1{backdrop-filter:blur(26px) saturate(1.12);-webkit-backdrop-filter:blur(26px) saturate(1.12);
  -webkit-mask-image:linear-gradient(to bottom,rgba(0,0,0,1) 0%,rgba(0,0,0,1) 14%,rgba(0,0,0,0) 36%);mask-image:linear-gradient(to bottom,rgba(0,0,0,1) 0%,rgba(0,0,0,1) 14%,rgba(0,0,0,0) 36%)}
#qaImmersive .qa-glass .qg2{backdrop-filter:blur(13px) saturate(1.08);-webkit-backdrop-filter:blur(13px) saturate(1.08);
  -webkit-mask-image:linear-gradient(to bottom,rgba(0,0,0,0) 12%,rgba(0,0,0,1) 30%,rgba(0,0,0,1) 48%,rgba(0,0,0,0) 66%);mask-image:linear-gradient(to bottom,rgba(0,0,0,0) 12%,rgba(0,0,0,1) 30%,rgba(0,0,0,1) 48%,rgba(0,0,0,0) 66%)}
#qaImmersive .qa-glass .qg3{backdrop-filter:blur(5px) saturate(1.05);-webkit-backdrop-filter:blur(5px) saturate(1.05);
  -webkit-mask-image:linear-gradient(to bottom,rgba(0,0,0,0) 46%,rgba(0,0,0,1) 64%,rgba(0,0,0,1) 82%,rgba(0,0,0,0) 95%);mask-image:linear-gradient(to bottom,rgba(0,0,0,0) 46%,rgba(0,0,0,1) 64%,rgba(0,0,0,1) 82%,rgba(0,0,0,0) 95%)}
@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){#qaImmersive .qa-frostwrap{display:block}#qaImmersive .qa-glass{display:none}}
#qaImmersive .qa-veil{position:absolute;left:0;right:0;top:55%;bottom:0;pointer-events:none;background:linear-gradient(to bottom,rgba(255,255,255,.20) 0%,rgba(255,255,255,.42) 22%,rgba(255,255,255,.62) 46%,rgba(255,255,255,.80) 70%,rgba(255,255,255,.92) 88%,rgba(255,255,255,.97) 100%)}
#qaImmersive .qa-hairline{position:absolute;left:0;right:0;top:55%;height:1px;pointer-events:none;background:linear-gradient(to right,rgba(255,255,255,0),rgba(255,255,255,.75),rgba(255,255,255,0))}
#qaImmersive .qa-top{position:absolute;top:0;left:0;right:0;z-index:6;padding:calc(env(safe-area-inset-top) + 12px) 14px 12px;display:flex;align-items:center;gap:10px;background:linear-gradient(to bottom,rgba(9,14,32,.55),rgba(9,14,32,0));color:#fff}
#qaImmersive .qa-back{width:32px;height:32px;border-radius:10px;display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,.18);font-size:17px;cursor:pointer;flex:none}
#qaImmersive .qa-who{flex:1;min-width:0}
#qaImmersive .qa-who b{display:block;font-size:14.5px;font-weight:700;text-shadow:0 1px 6px rgba(0,0,0,.45);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#qaImmersive .qa-who span{display:block;font-size:11.5px;opacity:.9;margin-top:2px;text-shadow:0 1px 6px rgba(0,0,0,.45)}
#qaImmersive .qa-live{font-size:11px;font-weight:700;background:rgba(52,211,153,.9);color:#062e22;border-radius:20px;padding:4px 9px;flex:none}
#qaImmersive .qa-panel{position:absolute;left:0;right:0;top:55%;bottom:calc(74px + env(safe-area-inset-bottom));z-index:5;display:flex;flex-direction:column;justify-content:flex-end;transition:top .34s cubic-bezier(.2,.7,.2,1)}
#qaImmersive.zoom .qa-panel{top:76%}
#qaImmersive .qa-msgs{overflow-y:auto;padding:10px 14px 12px;-webkit-overflow-scrolling:touch;display:flex;flex-direction:column;gap:10px}
#qaImmersive .qa-msgs .msg{margin:0;max-width:86%}
#qaImmersive .qa-msgs .msg.ai{align-self:flex-start;background:rgba(255,255,255,.94);border:1px solid rgba(226,232,240,.9);border-radius:14px 14px 14px 4px;padding:10px 13px;font-size:13.5px;line-height:1.72;color:#1e293b;box-shadow:0 6px 18px rgba(15,23,42,.14)}
#qaImmersive .qa-msgs .msg.user{align-self:flex-end;background:linear-gradient(135deg,#4F46E5,#7c3aed);color:#fff;border-radius:14px 14px 4px 14px;padding:9px 13px;font-size:13.5px;box-shadow:0 6px 18px rgba(79,70,229,.28)}
#qaImmersive .qa-msgs .msg.ai strong{color:#312E81}
#qaImmersive .qa-msgs .msg.ai p{margin:4px 0}
#qaImmersive .qa-composer{position:absolute;left:0;right:0;bottom:0;z-index:7;padding:8px 12px calc(8px + env(safe-area-inset-bottom));background:linear-gradient(to bottom,rgba(255,255,255,.72),rgba(255,255,255,.96));backdrop-filter:blur(14px) saturate(1.1);-webkit-backdrop-filter:blur(14px) saturate(1.1);border-top:1px solid rgba(226,232,240,.8)}
#qaImmersive .qa-row{display:flex;gap:6px;align-items:center}
#qaImmersive .qa-row input{flex:1;min-width:0;min-height:42px;padding:10px 12px;border:1.5px solid #dfe6ea;border-radius:12px;font-size:16px;background:#f7f9fc;color:#0f172a;outline:none;font-family:inherit;box-sizing:border-box}
#qaImmersive .qa-row input:focus{border-color:#4F46E5;background:#fff}
#qaImmersive .qa-row button{flex:none;height:42px;border-radius:13px;border:none;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;font-family:inherit;font-weight:600;font-size:14.5px}
#qaImmersive .qa-mic{width:44px;padding:0;background:#f2f5f7;color:#4F46E5;border:1px solid #e3e9ee}
#qaImmersive .qa-mic.rec{background:linear-gradient(135deg,#d3453a,#b0332a);color:#fff;border-color:#b0332a;animation:pulse 1s infinite}
#qaImmersive .qa-send{padding:0 16px;background:linear-gradient(135deg,#4F46E5,#7c3aed);color:#fff;box-shadow:0 2px 8px rgba(79,70,229,.3)}
#qaImmersive .qa-row button:active{transform:scale(.95)}
#qaImmersive .qa-hint{font-size:10.5px;color:#64748b;text-align:center;margin-top:6px}
@media (min-width:820px){
  #qaImmersive{align-items:center;justify-content:center;background:rgba(15,23,42,.62);backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px)}
  #qaImmersive.on{display:flex}
  #qaImmersive .qa-inner{width:400px;height:min(844px,92vh);border-radius:28px;box-shadow:0 30px 90px rgba(0,0,0,.55);border:1px solid rgba(255,255,255,.16)}
}
/* ===== 学生端移动版 v2（2026-09-23 老板：站在用户角度重排）=====
   目标：单列、统一节奏、去“卡片套卡片”、主操作突出、触控≥44px */
.td-hero{background:linear-gradient(135deg,#312E81,#4F46E5 58%,#6D28D9);border-radius:18px;padding:16px 18px;color:#fff;box-shadow:0 12px 28px -14px rgba(79,70,229,.55)}
.td-hero-tag{font-size:11px;letter-spacing:1px;opacity:.82;font-weight:700}
.td-hero-name{font-size:17px;font-weight:900;margin:4px 0 8px;line-height:1.35}
.td-hero-bar{background:rgba(255,255,255,.22);border-radius:6px;height:6px;overflow:hidden;max-width:360px}
.td-hero-bar i{display:block;height:100%;background:#fff;border-radius:6px}
.td-hero-meta{font-size:11.5px;opacity:.85;margin-top:6px}
.td-hero-btn{margin-top:13px;min-height:46px;padding:0 22px;border:none;border-radius:23px;background:#fff;color:#312E81;font-weight:900;font-size:14.5px;cursor:pointer;font-family:inherit}
.td-h{display:flex;align-items:center;gap:8px;margin:0 0 10px}
.td-h > b{font-size:15px;font-weight:800;color:#312E81;flex:1}
.td-h > span{font-size:11px;color:#94a3b8}
.td-stats{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.td-stats .st{display:flex;align-items:baseline;gap:6px}
.td-stats .st b{font-size:15px;font-weight:900;color:#312E81}
.td-stats .st span{font-size:12px;color:#64748b}
/* —— 「我的」入口页（资料头 + 列表）—— */
.cd-nav-m{display:none}
.stu-me{display:flex;flex-direction:column;gap:12px}
.stu-me-card{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid #e9edf7;border-radius:16px;padding:14px}
.stu-me-avatar{flex:none;width:52px;height:52px;border-radius:50%;background:linear-gradient(135deg,#4F46E5,#6D28D9);color:#fff;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:800}
.stu-me-name{font-size:16px;font-weight:800;color:#1E1B4B}
.stu-me-sub{font-size:12px;color:#94a3b8;margin-top:3px}
.stu-me-list{background:#fff;border:1px solid #e9edf7;border-radius:16px;overflow:hidden}
.stu-me-row{display:flex;align-items:center;gap:12px;padding:14px;font-size:14px;color:#334155;cursor:pointer;border-bottom:1px solid #f1f5f9;background:#fff;transition:background .15s;min-height:52px}
.stu-me-row:last-child{border-bottom:none}
.stu-me-row:active{background:#f8fafc}
.stu-me-row .ico{font-size:19px;width:24px;text-align:center}
.stu-me-row .t{flex:1;font-weight:700}
.stu-me-row .v{font-size:12px;color:#94a3b8}
.stu-me-row .ar{color:#cbd5e1;font-size:17px;font-weight:700}
.stu-pg-back{display:none;align-items:center;gap:6px;font-size:13.5px;color:#4F46E5;font-weight:700;padding:2px 0 10px;cursor:pointer;user-select:none}
.stu-me-sect{font-size:12.5px;color:#94a3b8;font-weight:600;margin:14px 4px 8px}
/* HERO（我的页顶部）2026-09-23 */
.stu-hero{position:relative;overflow:hidden;display:flex;align-items:center;gap:14px;background:linear-gradient(135deg,#4338CA,#6D28D9 58%,#8B5CF6);border-radius:0 0 24px 24px;padding:22px 18px 20px;color:#fff;box-shadow:0 14px 30px -18px rgba(79,70,229,.85)}
.stu-hero::before{content:'';position:absolute;width:220px;height:220px;border-radius:50%;background:radial-gradient(circle,rgba(255,255,255,.20),rgba(255,255,255,0) 70%);top:-96px;right:-56px}
.stu-hero::after{content:'';position:absolute;width:170px;height:170px;border-radius:50%;background:radial-gradient(circle,rgba(201,162,39,.30),rgba(201,162,39,0) 70%);bottom:-78px;left:-46px}
.stu-hero > *{position:relative;z-index:1}
.stu-hero-bell{flex:none;padding:0 2px;font-size:21px;line-height:1;cursor:pointer;position:relative;text-shadow:0 1px 4px rgba(0,0,0,.22)}
.stu-hero-bell:active{opacity:.75}
.stu-hero-bell .dot{position:absolute;top:-4px;right:-4px;min-width:17px;height:17px;line-height:17px;padding:0 4px;border-radius:9px;background:#dc2626;color:#fff;font-size:10px;font-style:normal;font-weight:700;text-align:center;border:1px solid rgba(255,255,255,.7)}
.stu-me-top{margin-top:0}
.stu-hero-av{border-color:rgba(255,255,255,.8);box-shadow:0 10px 22px -10px rgba(0,0,0,.5)}
.stu-hero-av{position:relative;flex:none;width:64px;height:64px;border-radius:50%;overflow:hidden;background:rgba(255,255,255,.22);display:flex;align-items:center;justify-content:center;cursor:pointer;border:2px solid rgba(255,255,255,.8)}
.stu-hero-av img{width:100%;height:100%;object-fit:cover;display:block}
.stu-hero-av .ph{font-size:24px;font-weight:800;color:#fff;display:flex;align-items:center;justify-content:center}
.stu-hero-av .cam{position:absolute;right:0;bottom:0;width:22px;height:22px;border-radius:7px;background:#C9A227;color:#fff;font-size:11px;display:flex;align-items:center;justify-content:center;border:2px solid rgba(255,255,255,.85);box-shadow:0 2px 6px rgba(0,0,0,.25)}
.stu-hero-nm{font-size:18px;font-weight:800;line-height:1.3}
.stu-hero-sub{font-size:12.5px;opacity:.9;margin-top:3px}
.stu-me-logout{background:#fff;border:1px solid #f0c9cd;color:#b91c1c;border-radius:14px;padding:14px;text-align:center;font-size:14.5px;font-weight:700;cursor:pointer;margin-top:8px}
.stu-me-logout:active{background:#fef2f2}
.stu-nc-h{font-size:13px;font-weight:800;color:#312E81;margin:14px 0 8px}
.stu-nc{border-radius:14px;padding:12px 14px;font-size:13px;margin-bottom:8px}
.stu-nc.ck-open{background:linear-gradient(135deg,#fff7ed,#ffedd5);border:1px solid #fdba74}
.stu-nc.ck-open .h{font-weight:800;color:#9a3412;font-size:13.5px}
.stu-nc.ck-open .d{color:#c2410c;font-size:12.5px;margin:3px 0 9px}
.stu-nc.ck-ok{background:#f0fdf4;border:1px solid #bbf7d0;color:#166534;font-weight:700}
.stu-nc.ck-none{background:#f8fafc;border:1px dashed #dbe4f0;color:#64748b}
.stu-ann{background:#fffbeb;border:1px solid #fde68a;border-radius:12px;padding:11px 13px;margin-bottom:8px}
.stu-ann .h{font-size:13px;font-weight:700;color:#92400e;display:flex;align-items:baseline;gap:8px}
.stu-ann .h span{font-size:11px;color:#b45309;font-weight:400;margin-left:auto}
.stu-ann .b{font-size:12.5px;color:#78350f;margin-top:4px;white-space:pre-wrap;line-height:1.65}
#studentPanel.stu-mobile .stu-pg-back{display:flex}
@media (max-width:768px){
  .topbar{padding:8px 12px}
  .topbar .brand{font-size:14.5px;letter-spacing:.5px}
  .wrap{padding:10px 12px calc(92px + env(safe-area-inset-bottom))}
  #studentPanel.stu-mobile{max-width:480px;margin:0 auto}
  #studentPanel.stu-mobile .taskdash{gap:12px}
  #studentPanel.stu-mobile .td-plain{background:transparent!important;border:none!important;padding:0!important;box-shadow:none!important;border-radius:0!important}
  #studentPanel.stu-mobile .td-sec{border-color:#e9edf7!important;border-radius:16px!important;padding:14px!important}
  #studentPanel.stu-mobile .td-row{border-color:transparent!important;box-shadow:none!important;padding:11px 12px!important;margin-bottom:8px!important}
  #studentPanel.stu-mobile .td-row:last-child{margin-bottom:0!important}
  #studentPanel.stu-mobile #stu-dash-courses{display:flex!important;flex-direction:column!important;gap:10px!important;overflow:visible!important;padding:0!important}
  #studentPanel.stu-mobile #stu-dash-courses .card{flex:1 1 auto!important;width:100%!important;padding:14px!important;border-radius:14px!important;box-shadow:none!important}
  #studentPanel.stu-mobile #stu-dash-courses .card:hover{transform:none!important;box-shadow:none!important}
  #studentPanel.stu-mobile #stu-dash-courses .card h3{font-size:15px!important}
  #studentPanel.stu-mobile #stu-dash-courses .card .row{margin-top:8px}
  #studentPanel.stu-mobile #stu-dash-courses .card .row .btn{width:100%!important;min-height:44px;display:flex;align-items:center;justify-content:center}
  #studentPanel.stu-mobile .td-hero-btn{width:100%!important;font-size:15px}
  #studentPanel.stu-mobile .td-stats{display:grid!important;grid-template-columns:repeat(4,1fr);gap:0;padding:14px 6px!important;align-items:center}
  #studentPanel.stu-mobile .td-stats .st{display:flex;flex-direction:column;align-items:center;gap:2px;text-align:center;padding:2px 0;min-width:0}
  #studentPanel.stu-mobile .td-stats .st b{display:block;font-size:17px;font-weight:900;color:#312E81;line-height:1.25}
  #studentPanel.stu-mobile .td-stats .st span{font-size:11px;color:#94a3b8}
  #studentPanel.stu-mobile .td-stats .st + .st{border-left:1px solid #eef2f9}
  #studentPanel.stu-mobile .course-breadcrumb{gap:6px!important;margin-bottom:10px!important;font-size:12px!important}
  #studentPanel.stu-mobile .course-breadcrumb select{max-width:none!important;width:100%!important;min-height:40px;margin-top:6px}
  #studentPanel.stu-mobile .course-head .course-title{font-size:22px!important}
  /* 课程 HERO：给文字更多宽度、立像收小、描述最多 2 行 */
  #studentPanel.stu-mobile .course-head{gap:12px!important;padding:16px 14px!important;border-radius:18px!important}
  #studentPanel.stu-mobile .course-head > div:first-child > div[style*="font-size:14px"]{-webkit-line-clamp:2!important;font-size:12.5px!important;margin-top:8px!important}
  #studentPanel.stu-mobile #hero-teacher-pic{flex:0 0 104px!important;width:104px!important;height:184px!important;border-radius:14px!important}
  #studentPanel.stu-mobile #hero-teacher-pic span{width:26px!important;height:26px!important;font-size:11px!important;right:5px!important;bottom:5px!important}
  #studentPanel.stu-mobile #course-teacher-intro{font-size:11px!important;-webkit-line-clamp:2;display:-webkit-box;-webkit-box-orient:vertical;overflow:hidden}
  /* —— 「我的」页：去标题/去外框，HERO 通栏到两侧（2026-09-23 老板）—— */
  #studentPanel.stu-mobile #stu-me > section{padding:0!important;background:transparent!important;border:none!important;border-radius:0!important;box-shadow:none!important;margin:0!important}
  #studentPanel.stu-mobile #stu-me > section > h2{display:none!important}
  #studentPanel.stu-mobile #stuMeBox{padding:0 12px}
  #studentPanel.stu-mobile #stuMeBox .stu-hero{margin:-10px -24px 14px;width:calc(100% + 48px);max-width:none;border-radius:0 0 26px 26px;box-shadow:0 12px 26px -18px rgba(79,70,229,.8);padding:20px 18px 22px}
  /* —— 顶部栏（仅首页；两行品牌；去右侧）—— */
  .topbar{padding:13px 12px!important}
  .topbar .user #meInfo{display:none!important}
  body.stu-mobile .topbar .user > button{display:none!important}
  .topbar .brand{display:flex;align-items:center;gap:8px;font-size:15.5px;letter-spacing:0;line-height:1.35}
  .topbar .brand .b-ico{font-size:16px;line-height:1.25}
  .topbar .brand .b-txt{display:flex;flex-direction:column;min-width:0}
  .topbar .brand #brandName{white-space:normal;overflow:visible;text-overflow:clip}
  .topbar .brand #brandVer{background:none!important;border:none!important;padding:0!important;margin:0!important;font-size:12px!important;opacity:.9;font-weight:600;letter-spacing:.3px}
  /* —— 课程页：保留课程卡片（HERO），只去面包屑与横幅 —— */
  #studentPanel.stu-mobile #stuCourses > .course-breadcrumb{display:none!important}
  #studentPanel.stu-mobile #stuCourses > div[id^="stu-banner-"]{display:none!important}
  /* —— 课程页胶囊：不滑动、去「更多」（条目全部展开）—— */
  #studentPanel.stu-mobile .cd-side .cd-menu{flex-wrap:wrap!important;overflow:visible!important;gap:8px!important;padding:10px 12px!important;-webkit-mask-image:none!important;mask-image:none!important}
  #studentPanel.stu-mobile .cd-menu-item[data-more]{display:flex!important}
  #studentPanel.stu-mobile .cd-menu-item.cd-more-btn{display:none!important}
  #studentPanel.stu-mobile .cd-more-pop{display:none!important}
  #studentPanel.stu-mobile .cd-menu-item[data-tab="announce"],
  #studentPanel.stu-mobile .cd-menu-item[data-tab="chat"],
  #studentPanel.stu-mobile .cd-menu-item.cd-home-btn{display:none!important}
  /* —— 答疑：保留底部菜单；去输入框下提醒 —— */
  #stuTabbar{z-index:360}
  #qaImmersive{z-index:320}
  #qaImmersive .qa-inner{height:calc(100vh - 58px)!important}
  #qaImmersive .qa-hint{display:none!important}
  #qaImmersive #chatInput{font-size:15px}
  #qaImmersive #chatInput::placeholder{font-size:12.5px;opacity:.8}
  /* —— 底部菜单稳定（不抖动/不偏移）—— */
  #stuTabbar{left:0!important;right:0!important;margin:0 auto!important;transform:translateZ(0)!important;backface-visibility:hidden}
  #stuTabbar .tab .ico svg{transition:none!important}
  #stuTabbar .tab:active .ico svg{transform:none!important}
  /* —— 课程卡：删掉简介与老师名之间的信息行 —— */
  #studentPanel.stu-mobile .course-head div[style*="font-size:12px;color:#7c86a1"][style*="display:flex"]{display:none!important}
  /* —— 课程导航：删「帮助」「学习进度」—— */
  #studentPanel.stu-mobile .cd-menu-item[data-tab="help"]{display:none!important}
  #studentPanel.stu-mobile #stu-chap-seg .seg-item[data-v="progress"]{display:none!important}
  /* —— 课程导航：宫格（替掉胶囊，去 seg）—— */
  #studentPanel.stu-mobile .cd-side{position:static!important;top:auto!important;padding:0!important;border:none!important;background:transparent!important;box-shadow:none!important;margin-bottom:10px!important}
  #studentPanel.stu-mobile .cd-side .cd-menu{display:none!important}
  #studentPanel.stu-mobile #stu-chap-seg{display:none!important}
  #studentPanel.stu-mobile .cd-nav-m{display:flex;flex-wrap:nowrap;gap:2px;background:#fff;border:1px solid #eef1f8;border-radius:16px;padding:8px 6px;box-shadow:0 2px 12px -8px rgba(15,23,42,.18)}
  #studentPanel.stu-mobile .cd-nav-item{flex:1 1 0;min-width:0;white-space:nowrap;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;padding:2px 0;border-radius:12px;color:#5b6478;font-size:11px;font-weight:600;cursor:pointer;user-select:none;transition:background .18s,color .18s,transform .12s}
  #studentPanel.stu-mobile .cd-nav-item .i{width:27px;height:27px;border-radius:9px;display:flex;align-items:center;justify-content:center;font-size:15px;line-height:1;background:#F3F5FB;transition:background .18s,box-shadow .18s}
  #studentPanel.stu-mobile .cd-nav-item:active{transform:scale(.95)}
  #studentPanel.stu-mobile .cd-nav-item[data-tab="chapters"] .i{background:#EEF2FF}
  #studentPanel.stu-mobile .cd-nav-item[data-tab="chapmat"] .i{background:#ECFDF5}
  #studentPanel.stu-mobile .cd-nav-item[data-tab="chapvid"] .i{background:#FEF3C7}
  #studentPanel.stu-mobile .cd-nav-item[data-tab="discuss"] .i{background:#F5F3FF}
  #studentPanel.stu-mobile .cd-nav-item[data-tab="tasks"] .i{background:#EFF6FF}
  #studentPanel.stu-mobile .cd-nav-item[data-tab="quizrec"] .i{background:#FDF2F8}
  #studentPanel.stu-mobile .cd-nav-item[data-tab="quiz"] .i{background:#FFF7ED}
  #studentPanel.stu-mobile .cd-nav-item.active{color:#fff;font-weight:800;background:linear-gradient(135deg,#4F46E5,#6D28D9);box-shadow:0 8px 16px -8px rgba(79,70,229,.75)}
  #studentPanel.stu-mobile .cd-nav-item.active .i{background:rgba(255,255,255,.22);box-shadow:none}
  /* —— 讨论区：输入框与发布按钮加高（2026-09-23 老板）—— */
  #studentPanel.stu-mobile #disc-new-title{height:44px!important;font-size:14px!important;padding:0 12px!important;border-radius:10px!important}
  #studentPanel.stu-mobile #disc-new-content{min-height:104px!important;font-size:14px!important;padding:10px 12px!important;line-height:1.6!important;border-radius:10px!important}
  #studentPanel.stu-mobile #cd-discuss .btn.sm{min-height:44px!important;padding:0 18px!important;font-size:14px!important;border-radius:10px!important}
  #studentPanel.stu-mobile #cd-discuss .row{gap:8px}
  /* —— 数字卡片更整齐 —— */
  #studentPanel.stu-mobile .td-stats{padding:16px 4px!important}
  #studentPanel.stu-mobile .td-stats .st b{font-size:18px}
  #studentPanel.stu-mobile .td-stats .st span{display:block;margin-top:3px;white-space:nowrap}
  /* 顶部栏隐藏后，课程胶囊吸顶归 0 */
  #studentPanel.stu-mobile .cd-side{top:0!important}
}