/* =====================================================================
   草蜢快扫 — 全局样式
   ===================================================================== */
:root{
  --green:#27ae60; --green-d:#1e8449;
  --blue:#2f6fed; --red:#e74c3c; --amber:#f39c12;
  /* 品牌标识色，取自 assets/img/logo.svg（主绿 / 点缀橙） */
  --brand:#6B8E23; --brand-orange:#F25C05;
  --ink:#243447; --gray:#6b7a8d; --line:#e3e8ef;
  --bg:#f4f6fa; --card:#ffffff;
  --radius:10px;
  --shadow:0 2px 12px rgba(36,52,71,.08);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:"Microsoft YaHei","PingFang SC",-apple-system,Segoe UI,Roboto,sans-serif;
  color:var(--ink); background:var(--bg); font-size:15px; line-height:1.6;
}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{margin:.2em 0 .6em}
code{background:#eef1f6;padding:1px 6px;border-radius:4px;font-size:.9em}

/* ---------------- 按钮 ---------------- */
.btn{
  display:inline-block; border:1px solid var(--line); background:#fff;
  color:var(--ink); padding:9px 18px; border-radius:8px; cursor:pointer;
  font-size:15px; transition:.15s; user-select:none;
}
.btn:hover{border-color:#c8d2e0;text-decoration:none}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn-sm{padding:4px 12px;font-size:13px;border-radius:6px}
.btn-block{display:block;width:100%}
.btn-primary{background:var(--blue);border-color:var(--blue);color:#fff}
.btn-primary:hover{background:#245fd0}
.btn-success{background:var(--green);border-color:var(--green);color:#fff}
.btn-success:hover{background:var(--green-d)}
.btn-danger{background:var(--red);border-color:var(--red);color:#fff}
.btn-danger:hover{background:#c93a2c}
.btn-ghost{background:transparent;border-color:transparent;color:var(--gray)}
.btn-ghost:hover{background:#eef2f8}
.btn-outline{background:#fff;border:1px solid var(--blue);color:var(--blue)}
.btn-outline:hover{background:#eef3ff}
.btn-amber{background:var(--amber);border-color:var(--amber);color:#3a2600}
.btn-amber:hover{filter:brightness(.95)}

/* ---------------- 登录页 ---------------- */
.auth-body{
  min-height:100vh; display:flex; align-items:center; justify-content:center;
  background:linear-gradient(135deg,#3a7bd5,#27ae60); padding:20px;
}
.auth-admin{background:linear-gradient(135deg,#2c3e50,#4b6584)}
.auth-card{
  background:#fff; width:100%; max-width:400px; padding:38px 34px 28px;
  border-radius:16px; box-shadow:0 18px 50px rgba(0,0,0,.25); text-align:center;
}
.auth-logo{display:block;width:84px;height:84px;margin:0 auto 6px;object-fit:contain}
.auth-card h1{font-size:24px;margin:6px 0 2px}
.auth-sub{color:var(--gray);font-size:14px;margin:0 0 22px}
.field{display:block;text-align:left;margin-bottom:16px}
.field span{display:block;font-size:13px;color:var(--gray);margin-bottom:5px}
.field input,.field select{
  width:100%; padding:11px 13px; border:1px solid var(--line); border-radius:8px;
  font-size:15px; outline:none;
}
.field input:focus{border-color:var(--blue)}
.auth-error{color:var(--red);font-size:14px;min-height:20px;margin-bottom:8px}
.auth-ok{color:#2e7d32;font-size:14px;margin-bottom:8px}
.auth-foot{margin-top:18px;font-size:13px;display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
.hint{color:var(--gray);font-size:12px;display:block;text-align:left}

/* ---------------- 顶栏 / 容器 ---------------- */
.topbar{
  display:flex; align-items:center; gap:24px; background:#fff;
  padding:0 22px; height:58px; box-shadow:var(--shadow); position:sticky; top:0; z-index:50;
}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:19px;color:var(--brand);white-space:nowrap}
.brand-logo{width:28px;height:28px;flex:none;display:block}
.nav{display:flex;gap:4px;flex:1;overflow-x:auto}
.nav a{padding:7px 13px;border-radius:7px;color:var(--ink);white-space:nowrap}
.nav a:hover{background:#eef2f8;text-decoration:none}
.nav a.active{background:var(--blue);color:#fff}
/* 导航分组：桌面端用竖线分隔，组名小字弱化，避免 10 项平铺找不到入口 */
.nav-group{display:flex;align-items:center;gap:2px}
.nav-group + .nav-group{border-left:1px solid var(--line);padding-left:10px;margin-left:8px}
.nav-group-label{font-size:11px;color:var(--gray);letter-spacing:.5px;padding:0 6px;white-space:nowrap;user-select:none}
.userbox{display:flex;align-items:center;gap:12px;color:var(--gray);white-space:nowrap}
.container{max-width:1180px;margin:24px auto;padding:0 20px}
.footer{text-align:center;color:var(--gray);font-size:13px;padding:26px}

.card-box{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;margin-bottom:20px}
.card-title{font-size:17px;font-weight:700;margin:0 0 16px;display:flex;justify-content:space-between;align-items:center}

/* ---------------- 表格 ---------------- */
table.data{width:100%;border-collapse:collapse;font-size:14px}
table.data th,table.data td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left}
table.data th{background:#f7f9fc;font-weight:600;color:var(--gray);white-space:nowrap}
table.data tr:hover td{background:#fafbfe}
.t-center{text-align:center}
.table-wrap{overflow-x:auto}

/* ---------------- 表单辅助 ---------------- */
.form-row{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:14px;align-items:flex-end}
.form-row .field{flex:1;min-width:140px;margin:0}
textarea{width:100%;border:1px solid var(--line);border-radius:8px;padding:11px;font-size:14px;font-family:inherit}

/* ---------------- 方案2：答案录入助手 ---------------- */
.akey-wrap{border:1px solid var(--line);border-radius:10px;overflow:hidden;margin:4px 0 14px}
.akey-tabs{display:flex;background:#eef2f7;border-bottom:1px solid var(--line)}
.akey-tab{padding:11px 20px;border:0;background:transparent;cursor:pointer;font-size:14px;
  color:var(--gray);border-right:1px solid var(--line);font-family:inherit}
.akey-tab.active{background:#fff;color:var(--blue);font-weight:700;box-shadow:inset 0 -2px 0 var(--blue)}
.akey-pane{padding:14px}
#quickText{min-height:128px;font-family:Consolas,Menlo,monospace;font-size:15px;line-height:1.7;resize:vertical}
.akey-quick-bar{display:flex;align-items:center;gap:12px;margin-top:9px;flex-wrap:wrap}
.akey-hint{margin-top:7px;font-size:12.5px}
.akey-tools{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;
  margin-bottom:10px;font-size:13px;color:var(--gray)}
.akey-tools-r{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.akey-tools-r input.mini{width:54px;padding:5px 6px}
.akey-grid{display:grid;grid-auto-flow:column;grid-template-rows:none;
  gap:6px 10px;max-height:none;overflow:auto;padding:2px 4px}
.akey-cell{display:flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:8px;
  padding:6px 8px;background:#fff;min-width:190px}
.akey-cell.group-end{border-right:3px solid #b8c4d4;margin-right:6px}
.akey-cell.unset{border-color:#e3c168;background:#fffaf0}
.akey-cell .n{font-weight:700;width:26px;text-align:right;flex:none}
.akey-cell .opts{display:flex;gap:4px;flex:1}
.opt-btn{width:30px;height:28px;border:1px solid #c3cedb;background:#f7f9fc;border-radius:6px;
  cursor:pointer;font-weight:700;color:#5a6b80;font-size:14px;font-family:inherit;padding:0}
.opt-btn:hover{border-color:var(--blue)}
.opt-btn.sel{background:var(--blue);border-color:var(--blue);color:#fff}
.opt-btn.sel2{background:#7a3eb1;border-color:#7a3eb1;color:#fff}
.akey-cell .sc{width:46px;height:28px;font-size:12px;padding:2px 4px;margin:0}


/* ---------------- Alert / 徽章 ---------------- */
.alert{padding:11px 16px;border-radius:8px;margin-bottom:16px;font-size:14px}
.alert-success{background:#e7f7ef;color:var(--green-d)}
.alert-danger{background:#fdecea;color:#c0392b}
.alert-info{background:#eaf2fe;color:#245fd0}
/* nowrap：徽章文字（如「高一(2)班」）不许内部折行，多个徽章间换行 */
.badge{display:inline-block;padding:2px 9px;border-radius:20px;font-size:12px;white-space:nowrap}
.badge-green{background:#e7f7ef;color:var(--green-d)}
.badge-gray{background:#eef1f6;color:var(--gray)}
.badge-red{background:#fdecea;color:#c0392b}
.badge-amber{background:#fff4e0;color:#a9620a}

.muted{color:var(--gray)}
.right{text-align:right}
.mt{margin-top:16px}.mb{margin-bottom:16px}
.flex{display:flex;gap:12px;align-items:center}

/* =====================================================================
   扫描页（新结构）
   ===================================================================== */
.scan-body{background:#0e1116;min-height:100vh}
/* 桌面/一体机：scan-app 三段竖排 flex（顶栏 + 主区 + 底栏）；
   手机端 media query 覆盖为顶部信息栏隐藏，主区里 video-wrap 撑满 */
.scan-app{display:flex;flex-direction:column;height:100vh;min-height:0;position:relative}

/* ---- 电脑端/一体机：顶部信息栏（flex 第 1 段，固定高 56px） ---- */
.top-bar-desktop{
  flex:none;height:56px;position:relative;z-index:20;
  display:flex;align-items:center;gap:14px;padding:0 18px;
  background:#12161d;border-bottom:1px solid #232a34;color:#e8edf4;
}
.top-bar-desktop .hw-pick{display:flex;align-items:center;gap:6px;margin-left:4px}
.top-bar-desktop .hw-pick select{padding:6px 10px;border-radius:7px;border:1px solid #2c3543;background:#1d242e;color:#fff;font-size:14px;max-width:240px}
.top-bar-desktop .class-pick{color:#c4ccd8;font-size:14px}
.top-bar-desktop .class-pick strong{color:var(--green)}
.top-bar-desktop .btn-ghost{color:#c4ccd8;margin-left:auto}
.top-bar-desktop .busy-flag{color:#8b97a7;font-size:13px}
.top-bar-desktop .switch{margin-left:4px}

/* ---- 电脑端：主区容器（flex 第 2 段，内部 flex 横排：视频 + 右面板） ---- */
.desktop-main{
  flex:1 1 auto;min-height:0;display:flex;position:relative;background:#000;
}

/* ---- 电脑端摄像头 ---- */
.video-wrap{
  flex:1;min-width:0;min-height:0;position:relative;background:#000;
  display:flex;align-items:center;justify-content:center;border-right:1px solid #232a34;
}
#video{width:100%;height:100%;object-fit:contain}

/* ---- 电脑端右侧面板（420px 固定宽，大屏上比例更合理） ---- */
.scan-right{
  flex:0 0 420px;width:420px;background:#151a21;display:flex;flex-direction:column;
  border-left:1px solid #232a34;min-height:0;overflow:hidden;
}

/* ---- 电脑端：底部操作栏（flex 第 3 段，固定高 64px，按钮做大） ---- */
.action-bar-desktop{
  flex:none;height:64px;position:relative;z-index:20;
  display:flex;align-items:center;gap:14px;padding:0 18px;
  background:#12161d;border-top:1px solid #232a34;
}
.action-bar-desktop .btn-lg{font-size:18px;padding:14px 28px;font-weight:700}
.action-bar-desktop .zoom-pick select{padding:6px 10px;border-radius:7px;border:1px solid #2c3543;background:#1d242e;color:#fff;font-size:14px}
.action-bar-desktop .switch{color:#c4ccd8;font-size:14px}
.action-bar-desktop .btn{padding:10px 18px;font-size:15px}
.action-bar-desktop .btn-success{background:#1f8f4f;border-color:#1f8f4f}
.action-bar-desktop .btn-success:disabled{background:#3a4a44;border-color:#3a4a44;opacity:.6}

/* ---- 共享样式 ---- */
.stats-bar{display:flex;flex-wrap:wrap;gap:8px;padding:14px}
.stat{flex:1;background:#1d242e;border-radius:10px;text-align:center;padding:10px 4px}
.stat-n{display:block;font-size:24px;font-weight:800;color:var(--green)}
.stat-warn{color:var(--amber)}
.stat-l{font-size:12px;color:#8b97a7}
.scan-progress{flex-basis:100%;height:8px;border-radius:5px;background:#0f141c;overflow:hidden}
.scan-progress i{display:block;height:100%;width:0;background:var(--green);border-radius:5px;font-size:0;transition:width .3s}
.stats-bar .auto-switch{flex-basis:100%;justify-content:flex-end;margin-top:6px;font-size:12px}
.switch{display:flex;align-items:center;gap:6px;color:#c4ccd8;font-size:13px;cursor:pointer}

.record-list{flex:1;overflow-y:auto;padding:4px 14px}
.rec-item{background:#1d242e;border-radius:10px;padding:10px 13px;margin-bottom:9px}
.rec-head{display:flex;align-items:center;gap:8px;color:#e8edf4}
.rec-no{color:#8b97a7}
.rec-who{flex:1;font-weight:600}
.rec-score{color:var(--green);font-weight:800}
.rec-warn{color:#f0b24a;font-size:13px;margin-top:4px}

.unsub-wrap{padding:12px 14px;border-top:1px solid #232a34}
.unsub-wrap .btn-outline{background:transparent;color:#9fd0ff;border-color:#34507a}
.unsub-panel{margin-top:10px;max-height:180px;overflow-y:auto;background:#11161d;border-radius:8px;padding:6px 10px}
.unsub-item{color:#d7dee9;padding:5px 2px;border-bottom:1px solid #1c232c;font-size:14px}
.unsub-item small{color:#8b97a7}
.unsub-empty{color:var(--green);text-align:center;padding:12px}

.scan-guide{position:absolute;color:#8b97a7;font-size:16px;text-align:center;padding:20px}
.scan-guide .guide-emoji{font-size:48px;margin-bottom:12px}
.scan-guide .guide-sub{font-size:13px;margin-top:6px;color:#5a6474}

.result-overlay{
  position:absolute;left:50%;bottom:22px;transform:translateX(-50%);
  background:rgba(20,26,33,.88);backdrop-filter:blur(4px);
  color:#fff;padding:14px 26px;border-radius:12px;text-align:center;min-width:230px;
  border:1px solid #2c3543;z-index:30;
}
.result-overlay.good{border-color:var(--green)}
.result-overlay.bad{border-color:var(--red)}
.ro-id{font-size:17px;font-weight:700}
.ro-score{font-size:32px;color:var(--green);font-weight:800;line-height:1.2}
.bad .ro-score{color:var(--red);font-size:18px}
.ro-msg{color:#f0b24a;font-size:13px;margin-top:3px;
  max-width:78vw;word-break:break-word;white-space:normal;
  max-height:42vh;overflow-y:auto;-webkit-overflow-scrolling:touch}
.busy-flag{color:#8b97a7;font-size:13px}

/* =====================================================================
   手机端 (<1024px)：全屏摄像头 + 悬浮控件 + 底部面板
   ===================================================================== */
/* 手机端首屏之下的统计/记录区（桌面端隐藏） */
.mobile-more{display:none}

@media (max-width:1023px){
  /* 手机端：首屏 = 摄像头 + 悬浮作业栏 + 底部"立即扫描"按钮条（正好一屏）；
     已交/未交/记录等在 .mobile-more（首屏之下），整页下滑可见 */
  .scan-body{
    height:auto;min-height:100vh;min-height:100dvh;overflow:visible;
    padding:0;box-sizing:border-box;
  }
  .scan-app{flex-direction:column;height:100vh;height:100dvh;min-height:0;overflow:hidden}

  /* 电脑端元素隐藏 */
  .top-bar-desktop{display:none}
  .action-bar-desktop{display:none}
  .scan-right{display:none}

  /* 电脑端 .desktop-main 在手机端改竖排：只装 video-wrap，撑满 scan-app 中间段 */
  .desktop-main{flex:1 1 auto;min-height:0;min-width:0;display:flex;flex-direction:column;background:#000}

  /* 摄像头区占满顶部到底部面板之间（顶栏悬浮覆盖在画面上方，不占高度） */
  .video-wrap{
    flex:1 1 auto;min-height:0;width:100%;
    margin:0;border:none;border-radius:0;
  }
  .scan-app{
    padding:0;
    /* 安全区变量：默认取 env()，iOS 下另有保底（见下方 @supports） */
    --sat:env(safe-area-inset-top,0px);
    --sab:env(safe-area-inset-bottom,0px);
  }
  /* iOS WebKit 专属：个别环境（WebView/异常缓存）env() 返回 0 会让作业栏
     钻进时间栏，顶部保底 28px（状态栏高度），底部保底 12px 防按钮贴边 */
  @supports (-webkit-touch-callout:none){
    .scan-app{
      --sat:max(env(safe-area-inset-top,0px),28px);
      --sab:max(env(safe-area-inset-bottom,0px),12px);
    }
  }

  /* 手机端顶部栏：绝对悬浮在视频顶部，渐变压暗背景保证可读 */
  .top-bar{
    position:absolute;top:0;left:0;right:0;z-index:20;
    display:flex;align-items:center;gap:10px;
    padding:calc(6px + var(--sat)) 12px 10px 12px;
    background:linear-gradient(to bottom,rgba(10,13,18,.92) 0%,rgba(10,13,18,.62) 62%,rgba(10,13,18,0) 100%);
    border-bottom:none;
  }
  .top-bar .hw-pick{display:flex;align-items:center;gap:6px}
  .top-bar .hw-pick label{font-size:13px;color:#c4ccd8}
  .top-bar .hw-pick select{
    padding:5px 10px;border-radius:6px;border:1px solid #2c3543;
    background:#1d242e;color:#fff;font-size:14px;max-width:200px;
  }
  .top-bar .btn-ghost{margin-left:auto;color:#c4ccd8;font-size:13px}

  /* 检测状态浮层：贴视频区底部，文字加描边可读，不占布局高度 */
  .video-status{
    position:absolute;left:0;right:0;bottom:0;z-index:18;
    padding:26px 12px 8px 12px;text-align:center;
    background:linear-gradient(to top,rgba(10,13,18,.88) 0%,rgba(10,13,18,.45) 60%,rgba(10,13,18,0) 100%);
    pointer-events:none;
    text-shadow:0 1px 3px rgba(0,0,0,.85);
  }
  .video-status > div{max-height:2.9em;overflow:hidden}

  /* 悬浮控件（让开顶部作业栏） */
  .floating-bar{
    position:absolute;top:calc(58px + var(--sat));left:12px;right:12px;z-index:25;
    display:flex;justify-content:space-between;align-items:flex-start;
    pointer-events:none;
  }
  .floating-bar > *{pointer-events:auto}
  .progress-box{
    background:rgba(20,26,33,.85);backdrop-filter:blur(6px);
    border-radius:10px;padding:8px 14px;border:1px solid #2c3543;min-width:160px;
  }
  .progress-text{color:#e8edf4;font-size:13px;font-weight:600;display:block;margin-bottom:6px}

  /* 结果浮层更大 */
  .result-overlay{min-width:260px;font-size:16px;padding:16px 28px}

  /* 手机端底部按钮条：只放"立即扫描"+变焦，首屏常驻、尽量矮，
     底边用安全区/保底值避开浏览器工具栏 */
  .bottom-panel{
    flex:none;background:#151a21;border-top:1px solid #232a34;
    padding:8px 12px calc(8px + var(--sab));
  }
  .scan-action-row{display:flex;gap:8px;align-items:center}

  /* 首屏之下的统计区：随页面滚动，不限高 */
  .mobile-more{
    display:block;background:#151a21;
    padding:12px 12px calc(20px + var(--sab));
    border-top:1px solid #232a34;
  }
  .stats-row{display:flex;gap:8px;align-items:stretch}
  .stats-row .stat{flex:1}
  .stats-row .stat-n{font-size:19px}
  .stats-row .auto-switch{margin-left:auto;align-self:center}
  .mobile-more .btn-block{margin-top:10px;width:100%}
  .mobile-more .record-list{overflow:visible;max-height:none;padding:8px 0 0 0}
  .mobile-more .unsub-panel{margin-top:10px;max-height:220px;overflow-y:auto}
  .btn-outline{background:transparent !important;color:#9fd0ff;border-color:#34507a}
}

/* ---------------- 模态框 ---------------- */
.modal-mask{
  position:fixed;inset:0;background:rgba(8,11,15,.66);display:flex;
  align-items:center;justify-content:center;z-index:100;
  -webkit-transform:translateZ(0);transform:translateZ(0);
  overflow-y:auto;-webkit-overflow-scrolling:touch;
  padding:max(env(safe-area-inset-top,0px),12px) 12px
          max(env(safe-area-inset-bottom,0px),12px);
}
.modal-mask[hidden]{display:none}
.modal{background:#fff;border-radius:14px;width:min(440px,92vw);padding:24px;box-shadow:0 20px 60px rgba(0,0,0,.4)}
.modal h3{margin-top:0}
.modal-body{color:var(--ink);font-size:15px;margin-bottom:18px}
.modal-body small{color:var(--gray)}
.modal-actions{display:flex;gap:10px;justify-content:flex-end}
/* 作业编辑弹窗：宽版 + 内部滚动，表单不再跳到页顶 */
.modal.modal-lg,.modal.modal-md{max-height:88vh;display:flex;flex-direction:column;padding:0;overflow:hidden}
.modal.modal-lg{width:min(920px,94vw)}
.modal.modal-md{width:min(640px,94vw)}
.modal-head{display:flex;justify-content:space-between;align-items:center;gap:12px;
  padding:16px 22px;border-bottom:1px solid var(--line)}
.modal-head h3{margin:0;font-size:18px}
.modal-scroll{overflow-y:auto;padding:20px 22px 22px;-webkit-overflow-scrolling:touch}
.modal-close{background:transparent;border:0;font-size:22px;line-height:1;color:var(--gray);cursor:pointer;padding:0 4px}
.cand-list{display:flex;flex-direction:column;gap:8px;margin-top:10px}
.cand-btn{text-align:left}

/* =====================================================================
   管理后台（深色侧栏可选，这里用浅色沿用 topbar）
   ===================================================================== */
.admin-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.kpi{background:#fff;border-radius:12px;box-shadow:var(--shadow);padding:18px}
.kpi .v{font-size:28px;font-weight:800;color:var(--blue)}
.kpi .l{color:var(--gray);font-size:13px}
.pagination{display:flex;gap:6px;margin-top:14px;justify-content:center}
.pagination a,.pagination span{padding:5px 11px;border:1px solid var(--line);border-radius:6px}
.pagination .current{background:var(--blue);color:#fff;border-color:var(--blue)}

.chart-box{width:100%;height:340px}
.inline-form{display:inline}

/* ---------------- 移动端导航（汉堡菜单） ---------------- */
.nav-toggle{display:none}
@media (max-width:900px){
  .topbar{height:54px;gap:12px;padding:0 14px}
  .nav-toggle{
    display:inline-flex;align-items:center;justify-content:center;
    width:38px;height:38px;font-size:20px;line-height:1;
    background:#f1f4f9;border:0;border-radius:9px;color:var(--ink);cursor:pointer;
  }
  .brand{font-size:17px}
  .nav{
    display:none;position:absolute;top:54px;left:0;right:0;
    flex-direction:column;background:#fff;box-shadow:0 12px 26px rgba(20,30,50,.16);
    padding:8px 14px;max-height:calc(100vh - 54px);overflow-y:auto;
  }
  .nav.open{display:flex}
  .nav a{padding:13px 12px;font-size:16px;border-radius:9px}
  .nav-group{flex-direction:column;align-items:stretch}
  .nav-group + .nav-group{border-left:0;border-top:1px solid var(--line);
    padding-left:0;margin-left:0;padding-top:6px;margin-top:6px}
  .nav-group-label{display:block;padding:8px 12px 2px;font-size:12px;letter-spacing:1px}
  .userbox .who{display:none}
  .container{margin:16px auto;padding:0 14px}
}

/* ---------------- 新手引导 / 低频功能折叠 ---------------- */
.onboard{display:flex;align-items:center;gap:8px;flex-wrap:wrap;
  background:#f0f7ff;border:1px solid #cfe3fb;border-radius:10px;
  padding:12px 16px;margin-bottom:20px;font-size:14px}
.onboard .os{padding:5px 12px;border-radius:20px;background:#fff;color:var(--gray)}
.onboard .os.now{background:var(--blue);color:#fff;font-weight:600}
.onboard .os.done{color:var(--green-d)}
.onboard .arrow{color:var(--gray)}
.onboard .tip{color:var(--gray);font-size:13px}
.hw-advanced{margin-top:12px;font-size:13px}
.hw-advanced summary{cursor:pointer;color:var(--blue);padding:4px 0}
.hw-advanced > div{padding:10px 0 2px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}

/* =====================================================================
   手机端后台协调性（2026-11-03）
   白底后台（PHP 页 + 静态 HTML 共用）与扫描页是两套独立界面：扫描页
   body.scan-body 有自己的 1023px 断点，本节规则全部用 :not(.scan-body)
   排除它，不碰识别链路。
   ===================================================================== */
/* 桌面端账号入口留在顶栏，菜单里那份隐藏 */
body:not(.scan-body) .nav-user{display:none}

@media (max-width:900px){
  /* 汉堡按钮按习惯放右侧：DOM 里它也是顶栏最后一项（brand → nav → userbox → ☰）。
     .nav 手机端是 absolute 覆盖层、.userbox 隐藏，margin-left:auto 即可把它推到最右 */
  body:not(.scan-body) .nav-toggle{margin-left:auto;order:3}

  /* 顶栏只留品牌 + ☰：原来 ☰ 在最左，后面还挤着「修改密码」「退出」，320px 会溢出。
     账号入口改放进展开菜单的 .nav-user */
  body:not(.scan-body) .userbox{display:none}
  body:not(.scan-body) .nav-user{display:flex;flex-direction:column;align-items:stretch;
    border-left:0;border-top:1px solid var(--line);padding:8px 0 2px;margin-top:8px}
  body:not(.scan-body) .nav-user a{font-size:15px;color:var(--gray)}
  body:not(.scan-body) .nav-user a:last-child{color:var(--red)}
  body:not(.scan-body) .brand{font-size:16px}
  body:not(.scan-body) .brand-logo{width:26px;height:26px}

  /* 触摸目标：原 .btn-sm 仅约 27px 高，手指点不准 */
  body:not(.scan-body) .btn-sm{padding:7px 12px;min-height:36px;
    display:inline-flex;align-items:center;justify-content:center}

  body:not(.scan-body) .card-box{padding:16px 14px;margin-bottom:14px}
  body:not(.scan-body) .card-title{flex-wrap:wrap;gap:8px;margin-bottom:12px}
  body:not(.scan-body) .container{margin:14px auto}
  body:not(.scan-body) .footer{padding:18px 12px}

  /* 表格横向滑动：收紧内边距 + 惯性滚动，操作按钮允许换行 */
  body:not(.scan-body) .table-wrap{-webkit-overflow-scrolling:touch}
  body:not(.scan-body) table.data th,
  body:not(.scan-body) table.data td{padding:9px 9px}
  body:not(.scan-body) table.data td .btn{margin:2px 3px 2px 0;padding:6px 10px;
    min-height:34px;font-size:12.5px;white-space:nowrap}
  /* 操作列按钮横排，不再竖着堆高行；放不下时由 .table-wrap 兜底横滚 */
  body:not(.scan-body) table.data td.t-center{white-space:nowrap}

  /* 三步引导：换行后箭头会孤零零挂在行尾，手机端改纯步骤块 */
  body:not(.scan-body) .onboard{gap:6px;padding:10px 12px}
  body:not(.scan-body) .onboard .arrow{display:none}
  body:not(.scan-body) .onboard .os{flex:1 1 auto;text-align:center}
  body:not(.scan-body) .onboard .tip{flex-basis:100%;text-align:center}

  /* 答案录入：桌面左右两列每格 min-width:190px，手机 350px 放不下会横向溢出；
     改单列竖排 + 区域内部滚动，避免 60 题把弹窗撑得过长 */
  body:not(.scan-body) .akey-tab{flex:1;padding:10px 8px;font-size:13px;
    text-align:center;white-space:normal;line-height:1.35}
  body:not(.scan-body) .akey-grid{grid-auto-flow:row !important;
    grid-template-rows:none !important;max-height:52vh;overflow-y:auto;
    -webkit-overflow-scrolling:touch}
  body:not(.scan-body) .akey-cell{min-width:0}
  body:not(.scan-body) .opt-btn{width:28px;height:32px}
  body:not(.scan-body) .akey-cell .sc{width:42px;height:32px}

  /* 表单：两列各 140px 在手机上过窄，改单列 */
  body:not(.scan-body) .form-row{gap:0}
  body:not(.scan-body) .form-row>.field{min-width:100%;flex:none;margin-bottom:12px}

  /* 批量录入等折叠卡片有内联 padding:14px 22px，!important 覆盖为卡片标准内边距，
     和下方学生名单卡片左右对齐 */
  body:not(.scan-body) .hw-advanced{padding:12px 14px !important}
}

@media (max-width:600px){
  /* 大弹窗改全屏页（像原生页面），不再挤在屏幕中间的小框 */
  body:not(.scan-body) .modal-mask{padding:0}
  body:not(.scan-body) .modal.modal-lg,
  body:not(.scan-body) .modal.modal-md{width:100vw;max-width:100vw;
    height:100vh;height:100dvh;max-height:100dvh;border-radius:0}
  body:not(.scan-body) .modal:not(.modal-lg):not(.modal-md){
    width:calc(100vw - 32px);max-width:440px;margin:16px}
  body:not(.scan-body) .modal-head{padding:14px;
    padding-top:calc(14px + env(safe-area-inset-top,0px))}
  body:not(.scan-body) .modal-scroll{padding:16px 14px calc(24px + env(safe-area-inset-bottom,0px))}
  body:not(.scan-body) .modal-actions{flex-wrap:wrap}

  body:not(.scan-body) #addClassForm{flex-wrap:wrap}
  body:not(.scan-body) #addClassForm .field{flex:1 1 100%;margin:0 0 10px}
  body:not(.scan-body) #addClassBtn{width:100%}

  /* 表格可横滑的提示：默认隐藏，JS 检测到真正溢出（.is-scrollable）才显示，
     避免学生名单这种 4 列小表也挂着误导性提示；sticky 让它不随表格滚走 */
  body:not(.scan-body) .table-wrap::before{
    content:'← 表格较宽，左右滑动查看 →';display:none;
    position:sticky;left:0;width:100%;text-align:center;
    color:var(--gray);font-size:12px;padding:0 0 8px}
  body:not(.scan-body) .table-wrap.is-scrollable::before{display:block}
  body:not(.scan-body) table.data{font-size:13px}
}

/* ===== 逐题答案核对（与扫描页确认浮层视觉一致；首扫=蓝 / 订正=绿） ===== */
.cf-hint{font-size:13px;color:var(--gray,#777);line-height:1.5;margin-bottom:8px}
.cf-list{max-height:62vh;overflow:auto;border:1px solid #dfe6ec;border-radius:8px;
         padding:4px 8px;margin-bottom:8px;background:#fff}
.cf-row{display:flex;align-items:center;gap:8px;padding:6px 2px;border-bottom:1px solid #eef2f5}
.cf-row:last-child{border-bottom:none}
.cf-q{width:30px;font-weight:700;color:#2b6cb0;flex:none;text-align:center}
.cf-lbl{width:22px;flex:none;font-size:12px;font-weight:700;color:#888;text-align:center}
.cf-lbl.first{color:#2e6bd0}
.cf-lbl.corr{color:#2e9e5b}
.cf-opts{display:flex;gap:6px;flex:1}
.cf-opt{min-width:42px;height:36px;border:1.5px solid #b9c6d1;border-radius:7px;
        background:#fff;color:#445;font-size:15px;font-weight:700;
        -webkit-tap-highlight-color:transparent;display:flex;align-items:center;justify-content:center}
.cf-opt.on{background:#2e9e5b;border-color:#1f7a45;color:#fff}
.cf-opt.on.first{background:#2e6bd0;border-color:#2356a8}   /* 首扫所选 */
.cf-opt.on.corr{background:#2e9e5b;border-color:#1f7a45}    /* 订正所选 */
.cf-tag{font-size:11px;color:#d08a00;white-space:nowrap;min-width:56px;text-align:right}
.cf-tag.ok{color:#2e9e5b}
.cf-tag.bad{color:#e11d48}
.cf-tag.blank{color:#e11d48}