/* ============================================================
   说理小讲师 · 全站样式（V3.6 三端差异化响应式）
   手机：单栏 + 底部标签栏
   平板：顶部胶囊导航 + 双栏卡片
   PC  ：左侧固定侧边栏 + 多栏内容网格
   ============================================================ */
:root{
  --primary:#FF8C42; --secondary:#4FC3F7; --green:#66BB6A; --yellow:#FFD54F;
  --pink:#F48FB1; --purple:#7E57C2; --teal:#26A69A; --indigo:#5C6BC0;
  --bg:#FFF8EF; --card:#fff; --text:#4A3B32; --gray:#B0A79E;
  --radius:20px; --shadow:0 6px 18px rgba(255,140,66,.15);
}
*{margin:0;padding:0;box-sizing:border-box;font-family:"PingFang SC","Microsoft YaHei",sans-serif}
body{background:var(--bg);color:var(--text);min-height:100vh;-webkit-text-size-adjust:100%}
a{text-decoration:none;color:inherit}
button{font-family:inherit}
img,svg,video{max-width:100%}

/* ---------- 头部渐变 ---------- */
.head{color:#fff;padding:18px 20px;position:relative}
.head .t{font-size:20px;font-weight:bold}
.head .s{font-size:13px;opacity:.9;margin-top:4px}
.g1{background:linear-gradient(135deg,var(--primary),var(--pink))}
.g2{background:linear-gradient(135deg,var(--green),var(--secondary))}
.g3{background:linear-gradient(135deg,var(--yellow),var(--primary))}
.g4{background:linear-gradient(135deg,var(--indigo),var(--purple))}
.g5{background:linear-gradient(135deg,var(--teal),var(--secondary))}
.g6{background:linear-gradient(135deg,#FF7043,var(--pink))}

/* ---------- 应用外壳（手机默认单栏） ---------- */
.app{background:var(--bg);min-height:100vh;padding-bottom:78px}
.app.shell{padding-bottom:0}
.app-main{min-width:0}
.nav-brand{display:none}

/* ---------- 卡片 / 按钮 ---------- */
.body{padding:16px}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:16px;margin-bottom:14px}
.card-t{font-weight:bold;font-size:16px;margin-bottom:12px;display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:space-between}
.btn{display:inline-block;border:none;border-radius:999px;padding:12px;font-size:16px;font-weight:bold;color:#fff;cursor:pointer;text-align:center;transition:transform .1s}
.btn:active{transform:scale(.96)}
.btn-main{background:linear-gradient(135deg,var(--primary),#FF6B9C);box-shadow:0 6px 14px rgba(255,107,156,.4)}
.btn-block{display:block;width:100%}
.btn-sub{background:#fff;color:var(--primary);border:2px solid var(--primary);padding:8px 16px;font-size:13px}
.btn-sm{padding:6px 14px;font-size:12px}
.btn-danger{background:#fff;color:#E53935;border:2px solid #E53935;padding:8px 16px;font-size:13px}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;padding:14px 0 4px}

/* ---------- 统计块 ---------- */
.stat-row{display:flex;gap:10px}
.stat{flex:1;background:var(--bg);border-radius:14px;text-align:center;padding:12px 4px}
.stat b{font-size:22px;color:var(--primary)}
.stat span{display:block;font-size:12px;color:var(--gray);margin-top:2px}

/* ---------- 日历 ---------- */
.cal{display:grid;grid-template-columns:repeat(7,1fr);gap:6px}
.cal .wd{text-align:center;font-size:12px;color:var(--gray);padding:4px 0}
.day{aspect-ratio:1;border-radius:10px;background:#f3ece5;display:flex;align-items:center;justify-content:center;font-size:13px;color:var(--gray)}
.day.done{background:linear-gradient(135deg,var(--green),#8BC34A);color:#fff;font-weight:bold;box-shadow:0 3px 8px rgba(102,187,106,.4)}
.day.today{border:2px dashed var(--primary);color:var(--primary);background:#fff}

/* ---------- 底部标签栏（手机） ---------- */
.tabs{position:fixed;bottom:0;left:0;right:0;z-index:60;display:flex;
  background:#fff;border-top:1px solid #f0e6dc;padding:8px 0 10px;
  box-shadow:0 -4px 16px rgba(0,0,0,.05)}
.tabs > div:not(.nav-brand){flex:1;display:flex;flex-direction:column;align-items:center;gap:2px;
  font-size:12px;color:var(--gray);cursor:pointer;padding:2px 0;transition:color .15s}
.tabs .ico{font-size:22px;line-height:1}
.tabs > div.on{color:var(--primary);font-weight:bold}

/* ---------- 老师端/管理端导航（手机：顶部胶囊） ---------- */
.adm-nav{display:flex;gap:8px;padding:12px 16px;background:#fff;
  border-bottom:2px solid #ffe9d6;flex-wrap:wrap;z-index:60}
.adm-nav a{padding:8px 16px;border-radius:999px;font-size:14px;color:var(--gray);
  text-decoration:none;font-weight:bold;background:#FFF3E9;cursor:pointer;border:none;white-space:nowrap}
.adm-nav a.on{background:var(--primary);color:#fff}

/* ---------- 表格 ---------- */
.tbl{width:100%;border-collapse:collapse;font-size:14px}
.tbl th{background:#FFF3E9;color:var(--primary);padding:10px;text-align:center;white-space:nowrap}
.tbl td{padding:10px;text-align:center;border-bottom:1px solid #f4ede6;white-space:nowrap}
.tbl-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}

/* ---------- 开关 ---------- */
.switch{display:inline-block;width:42px;height:22px;border-radius:999px;background:#ccc;position:relative;flex-shrink:0;cursor:pointer;transition:background .2s}
.switch::after{content:"";position:absolute;width:18px;height:18px;border-radius:50%;background:#fff;top:2px;left:2px;transition:left .2s}
.switch.on{background:var(--green)}
.switch.on::after{left:22px}

/* ---------- 设置行 / 胶囊 ---------- */
.set-row{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:14px 0;border-bottom:1px dashed #eee;font-size:15px}
.pill{font-size:13px;background:var(--bg);border-radius:10px;padding:4px 11px;color:var(--gray);display:inline-block;white-space:nowrap}
.pill.on{background:var(--primary);color:#fff;font-weight:bold}

/* ---------- 表单 ---------- */
.field{margin-bottom:14px}
.field label{font-size:13px;font-weight:bold;display:block;margin-bottom:6px}
.inp,select.inp,textarea.inp{width:100%;border:2px solid #f0e2d5;border-radius:14px;padding:12px 14px;
  font-size:15px;background:#FFFDF9;color:var(--text);outline:none;font-family:inherit}
.inp:focus{border-color:var(--primary)}
textarea.inp{resize:vertical}
.bubble{background:#FFF3E9;border-radius:12px;padding:8px 12px;font-size:13px;color:#a05a1e;margin-top:6px;line-height:1.6}

/* ---------- 视频列表 ---------- */
.video-item{display:flex;gap:12px;align-items:center;margin-bottom:12px}
.thumb{width:86px;height:60px;border-radius:12px;background:linear-gradient(135deg,var(--secondary),var(--purple));
  flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:24px;color:#fff;cursor:pointer}
.v-info{flex:1;min-width:0}
.v-info b{font-size:14px;display:block;word-break:break-all}
.v-info p{font-size:12px;color:var(--gray);margin-top:4px;line-height:1.6}
.tag{display:inline-block;font-size:12.5px;border-radius:9px;padding:2px 9px;margin-top:4px}
.tag.pub{background:#E3F2FD;color:#1976D2}
.tag.pri{background:#FBE9E7;color:#D84315}
.tag.fav{background:#FFF8E1;color:#F9A825}

/* ---------- 排行榜 ---------- */
.rank-row{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px dashed #eee}
.medal{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:15px;flex-shrink:0}
.m1{background:#FFD54F}.m2{background:#E0E0E0}.m3{background:#FFAB91}.mn{background:#f3ece5}
.rank-row b{flex:1;font-size:14px}
.cnt{font-weight:bold;color:var(--primary)}

/* ---------- 弹层 / Toast / 进度条 ---------- */
.modal-mask{position:fixed;inset:0;background:rgba(0,0,0,.4);display:none;align-items:center;justify-content:center;z-index:100;padding:16px}
.modal-mask.show{display:flex}
/* 弹层统一尺寸：宽度固定，默认高度 = 宽度 × 2/3（宽:高 = 3:2）；
   内容超过该高度时自动长高（最多 88vh），避免按钮被裁切 */
.modal{background:#fff;border-radius:24px;width:min(560px,92vw);max-width:560px;
  min-height:calc(min(560px,92vw) * 2 / 3);height:auto;max-height:88vh;
  box-sizing:border-box;overflow-y:auto;padding:20px}
/* 视频预览弹层：宽度不变，高度 = 宽度 × 2.2/3，视频区域自适应剩余空间且不变形 */
.modal.wide{width:min(880px,94vw);max-width:880px;
  height:calc(min(880px,94vw) * 2.2 / 3);min-height:0;
  display:flex;flex-direction:column;overflow:hidden}
.modal.wide>h3,.modal.wide>div{flex-shrink:0}
.modal.wide #vm-video{flex:1 1 auto;min-height:0;width:100%;height:auto;
  object-fit:contain;background:#000}
.modal.auto{min-height:0}
/* 上传 / 编辑弹层：加宽并放宽字段间距，避免拥挤 */
.modal.roomy{width:min(680px,94vw);max-width:680px;min-height:0;padding:26px 28px}
.modal.roomy h3{font-size:19px;margin-bottom:18px}
.modal.roomy .field{margin-bottom:16px}
.modal.roomy .field label{font-size:13px;margin-bottom:7px}
.modal.roomy .inp{padding:12px 14px;font-size:14px}
.modal.roomy .modal-footer{margin-top:18px;gap:14px}
.modal.roomy .modal-footer .btn{padding:14px 18px;font-size:15px}
.modal h3{font-size:17px;margin-bottom:14px}
@media (max-width:767px){
  .modal{width:92vw;max-width:92vw;height:auto;max-height:88vh}
  .modal.wide{width:92vw;max-width:92vw;
    height:calc(92vw * 2.2 / 3);min-height:min(300px,86vh);max-height:92vh}
}
#toast{position:fixed;top:20px;left:50%;transform:translateX(-50%);background:rgba(74,59,50,.92);
  color:#fff;padding:10px 20px;border-radius:999px;font-size:14px;z-index:200;display:none;max-width:86vw;text-align:center}
.progress{height:10px;background:#f3ece5;border-radius:999px;overflow:hidden;margin-top:8px;display:none}
.progress .bar{height:100%;width:0;background:linear-gradient(90deg,var(--primary),#FF6B9C);transition:width .2s}

/* ---------- 图表 ---------- */
.chart{width:100%}
.chart text{font-size:13px}
.legend{display:flex;gap:20px;justify-content:center;font-size:12px;color:var(--gray);margin-top:6px}

/* ============================================================
   登录页
   ============================================================ */
.login-shell{padding:0 0 40px}
.login-hero{display:none}
.login-panel{padding:16px}
.login-panel .frame{max-width:440px;margin:8px auto 0;background:var(--card);border-radius:32px;
  box-shadow:0 10px 40px rgba(0,0,0,.12);overflow:hidden;border:6px solid #ffe3cc}
.login-panel .role-row{max-width:440px;margin:16px auto 0}
.login-tip{max-width:440px;margin:14px auto 0;font-size:12px;color:var(--gray);text-align:center;line-height:1.7}
.login-hero-badge{display:inline-block;background:rgba(255,255,255,.22);border-radius:999px;
  padding:4px 12px;font-size:12px;margin-bottom:10px}

/* 登录身份选择 */
.role-row{display:flex;gap:10px;margin-top:16px}
.role{flex:1;background:var(--bg);border-radius:16px;padding:14px 6px;text-align:center;
  font-size:13px;font-weight:bold;cursor:pointer;border:2px solid transparent;transition:all .15s}
.role.on{border-color:var(--primary);background:#fff;box-shadow:var(--shadow)}
.role .ico{font-size:26px;display:block;margin-bottom:4px}
.role .ico svg{display:inline-block;max-width:none}

/* ============================================================
   平板：768px – 1199px
   顶部胶囊导航 + 双栏卡片
   ============================================================ */
@media (min-width:768px){
  body{padding:0}
  .app{max-width:1000px;margin:0 auto;background:var(--bg);padding-bottom:0;
    box-shadow:0 12px 40px rgba(0,0,0,.06);min-height:100vh}

  /* 顶部横向胶囊导航 */
  .tabs{position:sticky;top:0;bottom:auto;left:auto;right:auto;max-width:none;margin:0;
    justify-content:center;gap:8px;padding:10px 16px;border-top:none;
    border-bottom:1px solid #f2e8de;border-radius:0;
    box-shadow:0 4px 14px rgba(0,0,0,.05)}
  .tabs > div:not(.nav-brand){flex:0 0 auto;flex-direction:row;gap:6px;
    font-size:14px;padding:9px 18px;border-radius:999px;background:#FFF3E9}
  .tabs .ico{font-size:16px}
  .tabs > div.on{background:var(--primary);color:#fff;box-shadow:0 6px 14px rgba(255,140,66,.3)}

  .adm-nav{position:sticky;top:0;justify-content:center;padding:12px 16px;border-radius:0}

  .head{padding:22px 26px}
  .head .t{font-size:22px}
  .body{padding:18px}

  /* 双栏卡片网格 */
  .card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;align-items:start}
  .card-grid > .card{margin-bottom:0}
  .card-grid > .span-2,
  .card-grid > .span-all{grid-column:1/-1}
  .card-grid + .card{margin-top:14px}

  .card{padding:18px}
  .login-shell{max-width:560px;margin:24px auto 40px;border-radius:32px;overflow:hidden;
    background:#fff;box-shadow:0 16px 50px rgba(0,0,0,.10)}
  .login-hero{display:block;background:linear-gradient(135deg,var(--primary),var(--pink));
    color:#fff;padding:26px 30px}
  .login-hero h1{font-size:24px;margin-bottom:8px}
  .login-hero p{font-size:13px;opacity:.95;line-height:1.7}
  .login-panel{padding:8px 20px 24px}
  .login-panel .frame{border:6px solid #ffe3cc;margin-top:0}
}

/* ============================================================
   PC 桌面：≥ 1200px
   左侧固定侧边栏 + 多栏内容
   ============================================================ */
@media (min-width:1200px){
  body{background:#F3ECE4}

  .app{display:grid;grid-template-columns:252px minmax(0,1fr);
    max-width:1380px;margin:26px auto;min-height:calc(100vh - 52px);
    border-radius:28px;background:var(--bg);padding-bottom:0;
    box-shadow:0 20px 55px rgba(120,80,50,.14)}
  .app-main{background:var(--bg)}
  .app > .app-nav{grid-column:1;grid-row:1/span 2}
  .app > .app-main{grid-column:2;grid-row:1/span 2}
  /* 老师端 / 管理端：头部 + 侧边栏 + 内容 */
  .app.shell{grid-template-rows:auto 1fr}
  .app.shell > .head{grid-column:2;grid-row:1;border-radius:0 28px 0 0}
  .app.shell > .app-nav{grid-column:1;grid-row:1/span 2;border-radius:28px 0 0 28px}
  .app.shell > .app-main{grid-column:2;grid-row:2;border-radius:0 0 28px 0}

  /* 侧边栏 */
  .tabs,.adm-nav{position:sticky;top:26px;left:auto;right:auto;bottom:auto;align-self:start;
    min-height:calc(100vh - 52px);
    display:flex;flex-direction:column;align-items:stretch;justify-content:flex-start;
    gap:4px;padding:22px 14px;margin:0;background:#fff;
    border:none;border-right:1px solid #f4ebe2;border-radius:28px 0 0 28px;
    box-shadow:none;z-index:30}
  .nav-brand{display:flex;align-items:center;gap:10px;padding:4px 10px 18px;
    margin-bottom:8px;border-bottom:1px dashed #f0e2d5}
  .nav-brand .logo{font-size:28px;line-height:1}
  .nav-brand .nb-text{font-size:15px;font-weight:bold;line-height:1.3}
  .nav-brand .nb-text small{display:block;font-size:11px;font-weight:normal;color:var(--gray);margin-top:2px}

  .tabs > div:not(.nav-brand),
  .adm-nav a{flex:0 0 auto;flex-direction:row;justify-content:flex-start;gap:10px;
    width:100%;padding:12px 14px;border-radius:14px;background:transparent;
    font-size:15px;color:#6B5B50;box-shadow:none;white-space:normal}
  .tabs > div:not(.nav-brand):hover,
  .adm-nav a:hover{background:#FFF3E9;color:var(--primary)}
  .tabs .ico{font-size:18px}
  .tabs > div.on,
  .adm-nav a.on{background:linear-gradient(135deg,var(--primary),#FF6B9C);color:#fff;
    box-shadow:0 8px 18px rgba(255,107,156,.30)}

  .app-main{border-radius:0 28px 28px 0;overflow:hidden}

  .head{padding:30px 34px}
  .head .t{font-size:25px}
  .head .s{font-size:14px;margin-top:6px}
  .head h2{font-size:26px!important}

  .body{padding:24px 28px 30px}

  /* 多栏网格 */
  .card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));
    gap:18px;align-items:start}
  .card-grid > .card{margin-bottom:0}
  .card-grid > .span-2{grid-column:span 2}
  .card-grid > .span-lg{grid-column:span 2}
  .card-grid > .span-all{grid-column:1/-1}
  .card-grid + .card{margin-top:18px}

  .card{padding:20px;margin-bottom:0}
  .card:hover{box-shadow:0 10px 26px rgba(255,140,66,.20)}
  .card-t{font-size:17px}
  .card-grid > .card{margin-bottom:0}

  .stat b{font-size:26px}
  .thumb{width:104px;height:70px}
  .bubble{font-size:13px}

  /* 图表并排 */
  #tp-analyze.card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  #tp-videos #tv-list.card-grid{grid-template-columns:repeat(auto-fit,minmax(330px,1fr))}

  /* 表格更宽松 */
  .tbl{font-size:14.5px}
  .tbl th{padding:12px}
  .tbl td{padding:12px}

  /* 设置页三栏 */
  #ap-settings.card-grid{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}

  /* 登录页：左侧品牌面板 + 右侧表单 */
  .login-shell{display:grid;grid-template-columns:1.05fr .95fr;
    max-width:1040px;margin:56px auto;border-radius:32px;overflow:hidden;
    background:#fff;box-shadow:0 24px 70px rgba(120,80,50,.20)}
  .login-hero{display:flex;flex-direction:column;justify-content:center;
    background:linear-gradient(150deg,#FF8C42 0%,#FF6B9C 55%,#F48FB1 100%);
    color:#fff;padding:56px 48px;position:relative;overflow:hidden}
  .login-hero::after{content:"";position:absolute;width:320px;height:320px;border-radius:50%;
    background:rgba(255,255,255,.10);right:-120px;bottom:-120px}
  .login-hero h1{font-size:34px;line-height:1.35;margin-bottom:14px}
  .login-hero p{font-size:14px;opacity:.95;line-height:1.9}
  .login-hero ul{list-style:none;margin-top:26px;display:grid;gap:12px}
  .login-hero li{font-size:14px;display:flex;align-items:center;gap:10px;
    background:rgba(255,255,255,.16);border-radius:14px;padding:10px 14px}
  .login-panel{display:flex;flex-direction:column;justify-content:center;
    padding:40px 44px;background:#fff}
  .login-panel .frame{max-width:none;margin:0;box-shadow:none;border:none;border-radius:0}
  .login-panel .frame .head{display:none}
  .login-panel .frame::before{content:"欢迎回来 · 选择身份登录";display:block;
    font-size:19px;font-weight:bold;margin:0 0 18px;color:var(--text)}
  .login-panel .role-row{max-width:none;margin:18px 0 0}
  .login-tip{max-width:none;margin:16px 0 0}
}

/* 超宽屏 */
@media (min-width:1600px){
  .app{max-width:1500px}
  .card-grid{grid-template-columns:repeat(auto-fit,minmax(340px,1fr))}
}

/* 触屏优化 / 打印 */
@media (hover:none){
  .card:hover{box-shadow:var(--shadow)}
}

/* ============================================================
   V3.6 新增组件
   ============================================================ */

/* ---------- 头部：标题区 + 右上角文字操作 ---------- */
.app .head{display:flex;flex-wrap:wrap;align-items:flex-start;justify-content:space-between;gap:10px}
.head-main{min-width:0;flex:1 1 190px}
.head-actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center;justify-content:flex-end}
.head-btn{background:rgba(255,255,255,.22);border:1px solid rgba(255,255,255,.6);color:#fff;
  border-radius:999px;padding:6px 14px;font-size:13px;font-weight:bold;cursor:pointer;
  white-space:nowrap;transition:background .15s;line-height:1.3}
.head-btn:hover{background:rgba(255,255,255,.4)}
.head-sel{background:rgba(255,255,255,.22);border:1px solid rgba(255,255,255,.6);color:#fff;
  border-radius:999px;padding:6px 12px;font-size:13px;font-weight:bold;outline:none;
  max-width:190px;cursor:pointer}
.head-sel option{color:var(--text);font-weight:normal}

/* ---------- 分段切换（Tab） ---------- */
.seg{display:inline-flex;background:#FFF3E9;border-radius:999px;padding:4px;gap:4px;flex-wrap:wrap}
.seg button{border:none;background:transparent;border-radius:999px;padding:7px 16px;font-size:13px;
  font-weight:bold;color:#9C8B7E;cursor:pointer;white-space:nowrap;transition:all .15s}
.seg button.on{background:#fff;color:var(--primary);box-shadow:0 3px 10px rgba(255,140,66,.25)}

/* ---------- 工具条 / 搜索框 ---------- */
.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-bottom:12px}
.toolbar .grow{flex:1}
.search{position:relative;flex:1 1 200px;min-width:170px;max-width:420px}
.search::before{content:"🔍";position:absolute;left:12px;top:50%;transform:translateY(-50%);
  font-size:13px;opacity:.55;pointer-events:none}
.search .inp{padding-left:34px;background:#fff}
.empty-tip{text-align:center;color:var(--gray);font-size:13px;padding:18px 0}

/* ---------- 用户端首页：上传块 + 统计块并排 ---------- */
.home-top{display:block}
@media (min-width:768px){
  .home-top{display:grid;grid-template-columns:1.25fr 1fr;gap:14px;align-items:stretch}
  .home-top>.card{margin-bottom:0;display:flex;flex-direction:column;justify-content:center}
}

/* ---------- 老师端视频卡片（定高 + 评语省略 + 悬停看全） ---------- */
.vcard{display:flex;flex-direction:column;position:relative}
.vcard:hover{z-index:20;box-shadow:0 12px 30px rgba(255,140,66,.22)}
.vcard-t{display:block;margin-bottom:8px;text-align:left}
.vcard-t b{display:block;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.vcard-t i{display:block;font-style:normal;font-size:11px;color:var(--gray);margin-top:3px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.vcard-thumb{width:100%;height:104px;border-radius:14px;flex-shrink:0;cursor:pointer;
  background:linear-gradient(135deg,var(--secondary),var(--purple));
  display:flex;align-items:center;justify-content:center;font-size:30px;color:#fff}
.vcard-meta{font-size:11px;color:var(--gray);margin:8px 0 6px;display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.tipwrap{position:relative}
.tipwrap:hover{z-index:36}
.clamp{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;
  font-size:12px;line-height:1.55;background:#FFF3E9;color:#A05A1E;border-radius:10px;padding:6px 9px}
.tipbox{display:none;position:absolute;left:0;right:0;top:0;z-index:30;background:#fff;
  border:1px solid #FFE3CC;border-radius:12px;box-shadow:0 12px 30px rgba(0,0,0,.16);
  padding:10px;font-size:12.5px;line-height:1.7;color:var(--text);white-space:pre-wrap;
  max-height:190px;overflow:auto;text-align:left}
.tipwrap:hover .tipbox{display:block}
/* 卡片标签行右侧的"修改评语"小入口 */
.cmt-edit{font-size:12.5px;line-height:1;color:var(--primary);background:#fff;
  border:1.5px solid #FFD7BC;border-radius:9px;padding:5px 10px;cursor:pointer;
  white-space:nowrap;flex-shrink:0;transition:background .15s;font-family:inherit}
.cmt-edit:hover{background:#FFF3E9}

/* 上传弹窗的格式 / 大小 / 时长说明 */
.up-tip{background:#FFF8F1;border:1px solid #FFE3CC;border-radius:12px;
  padding:10px 12px;margin:-2px 0 8px;font-size:12.5px;line-height:1.85;
  color:#8A6A4F;display:flex;gap:6px;flex-wrap:wrap}
.up-tip b{color:#A05A1E;white-space:nowrap}

.vcard-actions{display:flex;gap:8px;align-items:center;margin-top:auto;padding-top:10px;flex-wrap:nowrap}
.vcard-actions .btn{white-space:nowrap}
.icon-btn{position:relative;width:34px;height:34px;border-radius:11px;border:2px solid var(--primary);
  background:#fff;color:var(--primary);font-size:15px;display:inline-flex;align-items:center;
  justify-content:center;cursor:pointer;padding:0;line-height:1;flex-shrink:0;transition:background .15s}
.icon-btn:hover{background:#FFF3E9}
.icon-btn.on{background:var(--primary);color:#fff}
.icon-btn[data-tip]:hover::after{content:attr(data-tip);position:absolute;bottom:calc(100% + 6px);left:50%;
  transform:translateX(-50%);background:rgba(74,59,50,.94);color:#fff;font-size:11px;
  padding:3px 8px;border-radius:6px;white-space:nowrap;z-index:40}
@media (min-width:768px){
  .vcard{height:340px}
  .vcard-t{height:52px;overflow:hidden}
}

/* ---------- 名单维护：老师/学生分栏 ---------- */
.member-body{padding-top:14px}

/* ============================================================
   V3.7：视频首帧缩略图 / 弹层内容紧凑 / 上传项操作
   ============================================================ */

/* 缩略图（首帧截图） */
.thumb{position:relative;overflow:hidden;padding:0}
.vcard-thumb{position:relative;overflow:hidden}
.thumb-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;
  opacity:0;transition:opacity .25s;z-index:1;display:block}
.thumb-img.on{opacity:1}
.thumb-play{position:relative;z-index:2;font-size:22px;color:#fff;
  text-shadow:0 2px 8px rgba(0,0,0,.45);pointer-events:none}
.vcard-thumb .thumb-play{font-size:30px}
.thumb.has-img .thumb-play,.vcard-thumb.has-img .thumb-play{
  background:rgba(0,0,0,.28);width:38px;height:38px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-size:16px}
.vcard-thumb.has-img .thumb-play{width:46px;height:46px;font-size:18px}

/* 弹层内部更紧凑（配合 3:2 固定高度） */
.modal .field{margin-bottom:8px}
.modal .field label{font-size:12px;margin-bottom:4px}
.modal h3{font-size:16px;margin-bottom:8px}
.modal .inp{padding:8px 11px;font-size:13px}
.modal-footer{display:flex;gap:10px;margin-top:8px}
#up-info:empty{display:none}
#up-info{font-size:12px;color:var(--gray);margin:0 0 6px}
.modal::-webkit-scrollbar{width:6px}
.modal::-webkit-scrollbar-thumb{background:#f0e0d0;border-radius:6px}


/* 我的历史上传：可见性标签 + 评论/编辑/删除入口，统一一行 */
.v-ops{display:flex;gap:7px;flex-wrap:wrap;align-items:center;margin-top:7px}
.v-ops .btn{padding:4px 11px;font-size:12px}
.v-ops .tag{margin-top:0}

/* ============================================================
   V3.10：页签底色 / 简洁头像图标 / 通用分页 / 上传历史
   ============================================================ */

/* 可点击页签：未选中也有明显底色，选中为渐变高亮 */
.pill{background:#FFF3E9;color:#9A887A;border:1px solid #F6E1CE}
.pill.on{background:linear-gradient(135deg,var(--primary),#FF6B9C);color:#fff;
  border-color:transparent;box-shadow:0 4px 10px rgba(255,140,66,.25)}
.vf-tabs{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.vf-tabs .pill{padding:6px 14px;font-weight:bold;cursor:pointer;transition:all .15s}
.vf-tabs .pill:hover{border-color:#FFC79B;color:var(--primary)}

/* 简洁头像图标（替代 👩‍🏫） */
.ico-avatar{display:inline-block;width:1.12em;height:1.12em;border-radius:50%;position:relative;
  vertical-align:-.18em;overflow:hidden;flex-shrink:0;
  background:linear-gradient(135deg,#4FC3F7,#26A69A)}
.ico-avatar::before{content:"";position:absolute;left:50%;top:19%;width:36%;height:36%;
  border-radius:50%;background:#fff;transform:translateX(-50%)}
.ico-avatar::after{content:"";position:absolute;left:50%;bottom:7%;width:62%;height:34%;
  border-radius:60% 60% 40% 40%;background:#fff;transform:translateX(-50%)}
.ico-avatar.light{background:rgba(255,255,255,.94)}
.ico-avatar.light::before,.ico-avatar.light::after{background:#26A69A}
.nav-brand .logo .ico-avatar,.nav-brand .ico-avatar{width:28px;height:28px;vertical-align:middle}

/* 通用分页条 */
.pager{display:flex;justify-content:space-between;align-items:center;gap:10px;
  flex-wrap:wrap;margin-top:14px}
.pg-info{font-size:12px;color:var(--gray)}
.pg-controls{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.pg-btn{border:1px solid #F0DFCE;background:#fff;color:#8D7B6D;border-radius:9px;
  padding:5px 11px;font-size:12px;font-weight:bold;cursor:pointer;transition:all .15s}
.pg-btn:hover{background:#FFF3E9;color:var(--primary);border-color:#FFD9BC}
.pg-btn.on{background:var(--primary);border-color:var(--primary);color:#fff}
.pg-btn[disabled]{opacity:.42;cursor:not-allowed}
.pg-sel{border:1px solid #F0DFCE;background:#fff;color:#8D7B6D;border-radius:9px;
  padding:5px 8px;font-size:12px;cursor:pointer;outline:none}

/* 统计周期：页签 / 日期区间 / 保存按钮始终同一行，选中"自定义"后向右延伸 */
.period-bar{display:flex;align-items:center;gap:8px;flex-wrap:nowrap;
  justify-content:flex-end;min-width:0;flex:0 1 auto}
.period-custom{display:flex;align-items:center;gap:6px;flex-wrap:nowrap}
.period-custom .inp{width:auto;padding:5px 9px;font-size:12px;border-radius:10px}
.period-custom .btn{padding:5px 12px;font-size:12px;white-space:nowrap}
@media (max-width:820px){
  .period-bar,.period-custom{flex-wrap:wrap;justify-content:flex-start}
}

/* 上传历史表格 */
.tbl td .mini{display:block;font-size:11px;color:var(--gray);margin-top:2px}
.tbl tr.row-del td{background:#FCFAF8;color:#B5A9A0}
.tag.del{background:#F1ECE7;color:#9E9188}
.hist-ops{display:flex;gap:6px;justify-content:center;flex-wrap:wrap}
.hist-ops .btn{padding:4px 10px;font-size:12px}
.cmt-body{background:#FFF3E9;border-radius:12px;padding:12px 14px;font-size:13px;
  line-height:1.8;color:#8A4F1B;white-space:pre-wrap;max-height:44vh;overflow:auto}

/* 存储分析 */
.sto-item{flex:1;min-width:120px;background:#FFF8EF;border-radius:16px;padding:14px 16px;
  text-align:center}
.sto-item b{display:block;font-size:22px;color:var(--primary)}
.sto-item span{font-size:12px;color:var(--gray)}
.sto-item.teal b{color:var(--teal)}
.ck-lb{display:flex;gap:5px;align-items:center;font-size:13px;cursor:pointer;
  background:#FFF3E9;border:1px solid #F6E1CE;border-radius:10px;padding:6px 10px;user-select:none}

/* 存储分析：4 项分析内容 2×2 排列 */
.sto-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
.sto-grid > .card{align-self:stretch}
@media (max-width:900px){
  .sto-grid{grid-template-columns:minmax(0,1fr)}
}

/* 学生名单行内操作 */
.stu-ops{display:flex;gap:6px;justify-content:center;flex-wrap:nowrap}
.stu-ops .btn{white-space:nowrap}

/* 已过期视频（管理员清理文件后）缩略图占位 */
.expired-thumb{display:flex;align-items:center;justify-content:center;background:#F3EEE9;
  color:#B5A9A0;font-size:12px;border-radius:14px;letter-spacing:1px}

/* 学生容量排行（HTML 列表） */
.rk-row{display:flex;align-items:center;gap:8px;padding:5px 0;font-size:13px}
.rk-no{flex:0 0 20px;height:20px;line-height:20px;text-align:center;border-radius:6px;
  background:#F6EFE7;color:#8D7B6D;font-size:11px;font-weight:bold}
.rk-no.top{background:linear-gradient(135deg,#FF8C42,#FFA726);color:#fff}
.rk-name{flex:1 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.rk-name i{font-style:normal;color:#B0A79E;font-size:11px;margin-left:5px}
.rk-bar{flex:0 0 26%;height:8px;background:#F6EFE7;border-radius:5px;overflow:hidden}
.rk-bar i{display:block;height:100%;border-radius:5px;
  background:linear-gradient(90deg,#FF8C42,#FFA726)}
.rk-val{flex:0 0 62px;text-align:right;font-weight:bold;color:#4A3B32;font-size:12px}