/* ===== 白天模式：白底 + 深色文字 ===== */
*{box-sizing:border-box;margin:0;padding:0;font-family:system-ui,"Microsoft YaHei",sans-serif;}
body{background:#f4f6fa;color:#20222e;padding:16px;line-height:1.6;}
.container{max-width:760px;margin:0 auto;}
.container.wide{max-width:1000px;}
h2{margin-bottom:14px;}
h3{margin-bottom:10px;font-size:16px;color:#2648b0;}
.mt{margin-top:18px;}
.panel{background:#fff;border:1px solid #e3e6f0;padding:16px;border-radius:8px;margin-bottom:12px;}
.panel.center{text-align:center;max-width:420px;margin:6vh auto;}
input{width:100%;padding:10px;margin:6px 0;background:#fff;color:#20222e;border:1px solid #ccd2e4;border-radius:4px;}
input:focus{outline:none;border-color:#3b63d9;}
/* 场控悬浮面板：按住顶部拖动（禁止选中与浏览器手势抢事件，避免拖动中断） */
#ctl-panel.float #ctl-head{cursor:move;user-select:none;-webkit-user-select:none;touch-action:none;}
#ctl-panel.float.dragging{opacity:.94;box-shadow:0 14px 34px rgba(10,15,40,.35);}
/* 登录/资料卡片里的下拉：与输入框同观感，自绘箭头 + 聚焦高亮 */
.panel.center select{width:100%;padding:12px 38px 12px 14px;margin:6px 0;
  background:#fff;color:#20222e;border:1px solid #d2d8ea;border-radius:10px;
  font-size:15px;line-height:1.4;cursor:pointer;
  -webkit-appearance:none;appearance:none;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='14' height='9'><path d='M1 1.5l6 6 6-6' fill='none' stroke='%23666f8c' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/></svg>");
  background-repeat:no-repeat;background-position:right 14px center;
  box-shadow:0 1px 2px rgba(16,24,64,.05);
  transition:border-color .15s, box-shadow .15s;}
.panel.center select:hover{border-color:#aab6dd;}
.panel.center select:focus{outline:none;border-color:#3b63d9;box-shadow:0 0 0 3px rgba(59,99,217,.16);}
/* 选项列表：尽量与整体风格协调（内容区背景 / 字号 / 间距，浏览器可定制部分有限） */
.panel.center select option{padding:8px 12px;font-size:14px;}
.row{display:flex;gap:10px;}
button{padding:9px 14px;margin:4px 4px 4px 0;background:#3b63d9;color:#fff;border:none;border-radius:4px;cursor:pointer;}
button:hover{background:#4a74ef;}
button:disabled{opacity:.45;cursor:not-allowed;}
button.gray{background:#6b6f8c;}
button.gray:hover{background:#7d81a0;}
button.danger{background:#c8402f;}
button.danger:hover{background:#dc5240;}
button.sm{padding:5px 10px;font-size:13px;}
.bar{display:flex;justify-content:space-between;align-items:center;background:#fff;border:1px solid #e3e6f0;padding:10px 16px;border-radius:8px;margin-bottom:12px;}
.bar.slim{padding:6px 16px;margin-top:-6px;}
.flex-between{display:flex;justify-content:space-between;align-items:center;}
.score{color:#a06d00;font-weight:600;}
.timer{color:#c2570a;font-weight:600;font-variant-numeric:tabular-nums;}
.muted{color:#5f637a;font-size:14px;}
.small{font-size:12px;margin-top:8px;}
.tip{margin-top:8px;font-size:15px;color:#8a6200;min-height:20px;display:inline-block;}
.tip.ok{color:#1d9e5b;}
.tip.bad{color:#d63a2a;}
.mode-btns button{font-size:15px;padding:10px 18px;}
.mode-btns button.active{background:#e0a12e;color:#fff;}
.badge{font-size:12px;padding:2px 10px;border-radius:10px;margin-right:4px;}
.badge.on{background:#1d8f57;color:#f2fff6;}
.badge.off{background:#e2e5f0;color:#565a72;}
.cols{display:flex;gap:12px;flex-wrap:wrap;}
.cols .panel{flex:1 1 340px;}
.opt-item{padding:12px;background:#f4f6fb;margin:8px 0;border-radius:6px;cursor:pointer;border:2px solid transparent;}
.opt-item:hover{background:#e9edf7;}
.opt-item.unclickable{opacity:.5;cursor:default;pointer-events:none;}
.opt-item.chosen{opacity:1;cursor:default;pointer-events:none;border-color:#3b63d9;background:#e8edfd;}
.opt-item.good{border-color:#2eaf72;background:#e3f7ec;}
.opt-item.chosen.good{background:#c9eedb;}
.opt-item.chosen.bad{background:#fbe4e0;border-color:#ff7a6b;}
/* 多选：提交前勾选态（区别于已答的 chosen，勾选态可继续点选/取消） */
.opt-item.picked{border-color:#3b63d9;background:#e8edfd;}
/* 作答提交条：单选/判断/多选统一先选中再点“提交答案” */
#submit-bar{display:none;align-items:center;gap:10px;flex-wrap:wrap;margin-top:10px;}
#submit-bar.on{display:flex;}
#submit-btn{margin:0;}
.buzz-info{margin:6px 0;color:#4a4f66;min-height:22px;}
.buzz-btn{display:none;padding:14px 46px;font-size:20px;font-weight:700;background:#e0483e;border-radius:10px;}
.buzz-btn:hover{background:#ef5a4f;}
.reveal-box{margin:10px 0;padding:10px 14px;background:#1d8f57;color:#fff;border-radius:6px;font-size:16px;}
.q-item{border-left:3px solid #d4d8e8;padding:6px 0 6px 10px;margin-bottom:10px;}
.q-item.active{border-left-color:#3b63d9;background:#eef2ff;}
.q-title{font-weight:600;}
.q-opts{font-size:13px;color:#565a72;margin:4px 0;}
.ans{color:#1d9e5b;font-size:13px;margin-left:6px;}
.rank-item{display:flex;align-items:center;gap:8px;padding:6px 0;border-bottom:1px solid #e4e7f2;}
.rank-item .no{width:24px;height:24px;line-height:24px;text-align:center;background:#e2e5f0;color:#3a3f55;border-radius:50%;font-size:13px;flex:none;}
.rank-item .nm{flex:1;word-break:break-all;}
.tag{font-size:12px;padding:1px 8px;border-radius:10px;background:#1d8f57;color:#f2fff6;flex:none;}
.tag.wait{background:#e2e5f0;color:#565a72;}
.tag.away{background:#f0a13a;color:#fff;}
.rank-item.off{opacity:.55;}
.rank-item.away{background:#fff8ec;}
.rank-ok{color:#1d8f57;}
.rank-away{color:#e08a16;}
.rank-left{color:#9aa0b5;}

/* ============ 教师端“现场动态”悬浮日志（可开关，默认左下角） ============ */
#log-fab{position:fixed;left:16px;bottom:16px;z-index:940;background:#2f3b66;color:#fff;
  border:none;border-radius:22px;padding:9px 16px;font-size:13.5px;cursor:pointer;
  box-shadow:0 4px 14px rgba(20,30,70,.28);}
#log-fab:hover{background:#3b63d9;}
#log-fab.on{background:#1d8f57;}
.log-badge{position:absolute;top:-6px;right:-8px;background:#e5484d;color:#fff;
  border-radius:10px;min-width:18px;height:18px;font-size:11px;line-height:18px;
  text-align:center;padding:0 5px;box-shadow:0 1px 4px rgba(0,0,0,.2);}
.log-panel{position:fixed;left:16px;bottom:62px;z-index:940;width:min(360px,calc(100vw - 32px));
  background:#fff;border:1px solid #d8dce8;border-radius:10px;overflow:hidden;
  box-shadow:0 10px 34px rgba(16,24,64,.20);display:flex;flex-direction:column;}
.log-head{display:flex;align-items:center;gap:8px;padding:8px 12px;
  border-bottom:1px solid #eef0f6;background:#f8f9fd;font-size:13px;}
.log-list{max-height:min(340px,60vh);overflow-y:auto;padding:6px 0;scrollbar-width:thin;}
.log-row{display:flex;align-items:flex-start;gap:7px;padding:4px 12px;font-size:13px;line-height:1.5;}
.log-row .log-dot{flex:none;width:8px;height:8px;border-radius:50%;margin-top:6px;}
.log-time{flex:none;color:#9aa0b5;font-size:11.5px;font-variant-numeric:tabular-nums;padding-top:1px;}
.log-body{color:#3d4258;word-break:break-all;}
.log-name{font-weight:600;color:#20222e;}
.log-away .log-dot{background:#f0a13a;}
.log-leave .log-dot{background:#8b90a5;}
.log-back .log-dot{background:#1d8f57;}
@media (max-width:600px){.row{flex-direction:column;gap:0;}}

/* ============ 升级版公共组件（账号体系 / 记录 / 测验 / 管理） ============ */
.topnav{display:flex;align-items:center;gap:14px;background:#fff;border:1px solid #e3e6f0;padding:9px 16px;border-radius:8px;margin-bottom:14px;flex-wrap:wrap;}
.topnav-title{font-weight:700;font-size:17px;color:#141720;margin-right:auto;}
.topnav-links{display:flex;gap:6px;flex-wrap:wrap;}
.tn-btn{display:inline-block;padding:6px 13px;border-radius:6px;background:#eef1f8;color:#33449c;text-decoration:none;font-size:14px;cursor:pointer;border:none;font-family:inherit;}
.tn-btn:hover{background:#dfe6fb;color:#23348c;}
.tn-btn.tn-active{background:#3b63d9;color:#fff;}
.topnav-user{display:flex;align-items:center;gap:8px;margin-left:auto;flex-wrap:wrap;}
.tn-me{color:#8a5f00;font-weight:600;font-size:14px;}
@media (max-width:760px){.topnav-title{margin-right:0;width:100%;}.topnav-user{margin-left:0;}}

.seg{display:flex;gap:6px;margin-bottom:14px;flex-wrap:wrap;}
.seg button{padding:7px 14px;}
.seg button.active{background:#e0a12e;color:#fff;}

.f-label{display:block;margin:10px 0 2px;font-size:13px;color:#565a72;}
.f-hint{font-size:12px;color:#73778f;margin-top:2px;line-height:1.5;}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:0 14px;}
@media (max-width:600px){.grid2{grid-template-columns:1fr;}}

.card{padding:18px;border-radius:8px;}
.ok-tip{color:#1d9e5b;font-size:13px;margin-top:6px;}
.err-tip{color:#d63a2a;font-size:13px;margin-top:6px;white-space:pre-line;}

.tbl{width:100%;border-collapse:collapse;font-size:14px;}
.tbl th,.tbl td{text-align:left;padding:8px 10px;border-bottom:1px solid #e4e7f2;vertical-align:top;}
.tbl th{color:#2648b0;font-weight:600;white-space:nowrap;}
.tbl tr:hover td{background:#f3f5fc;}
.tbl .num{font-variant-numeric:tabular-nums;}
.center-txt{text-align:center !important;}
.nowrap{white-space:nowrap;}

.pill{display:inline-block;font-size:12px;padding:2px 10px;border-radius:10px;line-height:1.7;}
.pill.normal{background:#1d8f57;color:#f2fff6;}
.pill.unclaimed{background:#f2e4bc;color:#6b4c00;}
.pill.disabled{background:#f6d9d5;color:#8c2418;}
.pill.green{background:#1d8f57;color:#f2fff6;}
.pill.gray{background:#e2e5f0;color:#565a72;}
.pill.orange{background:#f6e3bc;color:#7a4a00;}
.pill.blue{background:#dbe7ff;color:#1b3f9e;}
.pill.red{background:#f8dcd8;color:#8c2418;}
.pill.yellow{background:#f5efc9;color:#6b5b00;}
.ok-txt{color:#1d9e5b;}
.blue-txt{color:#23348c;}

.pager{display:flex;align-items:center;gap:10px;margin-top:12px;font-size:14px;}
.pager .muted{margin:0 auto;}

.detail-item{border:1px solid #e2e5f0;border-left:4px solid #3b63d9;border-radius:6px;padding:12px 14px;margin:12px 0;}
.detail-item .stem{font-weight:600;margin-bottom:8px;}
.detail-item .ok-mark{color:#1d9e5b;font-weight:700;}
.detail-item .bad-mark{color:#d63a2a;font-weight:700;}
.detail-item .right-ans{color:#1d9e5b;}
.detail-item .analysis{margin-top:8px;background:#f1f3fa;border:1px solid #e6e9f4;border-radius:6px;padding:10px 12px;font-size:14px;color:#3b4157;white-space:pre-wrap;}
.detail-item .no-ana{color:#73778f;font-size:12px;margin-top:6px;}

.mini-stat{display:inline-block;margin:0 16px 6px 0;font-size:14px;}
.mini-stat b{font-size:20px;margin-right:4px;color:#a06d00;}
.chart-box{background:#f6f7fc;border:1px solid #e6e9f4;border-radius:8px;padding:14px;margin:8px 0;overflow-x:auto;}
.chart-cap{font-size:13px;color:#5f637a;margin-bottom:6px;}
.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:12px;color:#565a72;margin:4px 0;}
.legend i{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:4px;vertical-align:-1px;}

.step-num{display:inline-flex;width:22px;height:22px;border-radius:50%;background:#3b63d9;color:#fff;align-items:center;justify-content:center;font-size:13px;margin-right:6px;flex:none;}
.locked-note{background:#fbe9e4;border:1px solid #dfa293;border-radius:6px;padding:10px 14px;margin:10px 0;font-size:14px;color:#6f2a1d;}

@media print{.topnav,.pager,button,.no-print{display:none !important;}body{background:#fff;color:#000;} .panel{background:#fff;border:1px solid #ccc;} .tbl th{color:#333;}}

/* ============ 顶栏头像 · 用户菜单 ============ */
.uc{position:relative;display:inline-flex;}
.uc-head{display:flex;align-items:center;gap:8px;padding:4px 8px;border-radius:9px;cursor:pointer;user-select:none;}
.uc-head:hover{background:#eef1f8;}
.uc-ava{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,#3b63d9,#8b5cf6);color:#fff;font-size:15px;font-weight:700;display:flex;align-items:center;justify-content:center;flex:none;overflow:hidden;}
.uc-name{color:#20222e;max-width:160px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.uc-caret{color:#8589a0;font-size:10px;transition:transform .15s;}
.uc.open .uc-caret{transform:rotate(180deg);}
.uc-menu{position:absolute;top:calc(100% + 8px);right:0;min-width:172px;background:#fff;border:1px solid #d9ddee;border-radius:11px;padding:6px;z-index:1300;box-shadow:0 10px 30px rgba(30,35,80,.16);}
.uc-item{display:flex;align-items:center;gap:8px;width:100%;margin:0;padding:9px 12px;border-radius:7px;background:none;border:none;color:#333849;font-size:14px;text-align:left;cursor:pointer;font-family:inherit;text-decoration:none;}
.uc-item:hover{background:#eef1f8;color:#141720;}
.uc-item.danger{background:none;color:#d64537;}   /* 红字、白底：覆盖全局 button.danger 的红底 */
.uc-item.danger:hover{background:#fdeae7;color:#b3372b;}
.uc-sep{height:1px;background:#e8eaf4;margin:5px 4px;}

/* ============ 自助弹窗（uc.js 动态生成）与轻提示 ============ */
.ucm-mask{position:fixed;inset:0;background:rgba(18,22,44,.45);z-index:1400;display:flex;align-items:center;justify-content:center;padding:16px;}
.ucm-box{width:min(430px,100%);max-height:92vh;overflow:auto;background:#fff;border:1px solid #d9ddee;border-radius:12px;padding:20px 22px;color:#20222e;box-shadow:0 14px 44px rgba(30,35,80,.2);}
.ucm-title{font-size:16px;font-weight:700;margin-bottom:2px;}
.ucm-sub{color:#6a6e84;font-size:13px;margin-bottom:6px;}
.ucm-tip{min-height:20px;font-size:14px;margin:6px 0 0;color:#8a6200;text-align:left;}
.ucm-tip.ok{color:#1d9e5b;}
.ucm-tip.bad{color:#d63a2a;}
.ucm-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:14px;}
.ucm-actions button{margin:0;}
.uc-toast{position:fixed;top:18px;left:50%;transform:translateX(-50%);z-index:1600;background:#1d8f57;color:#fff;padding:10px 22px;border-radius:9px;font-size:14px;box-shadow:0 8px 24px rgba(0,0,0,.2);}
.uc-toast.bad{background:#c8402f;}

/* ============ 静态页面弹层（.mask > .modal：账号管理 / 统计报告页面使用；各弹窗宽度由元素内联 max-width 覆盖） ============ */
.mask{position:fixed;inset:0;background:rgba(18,22,44,.45);z-index:1400;display:flex;align-items:center;justify-content:center;padding:16px;}
.modal{width:100%;max-width:430px;max-height:92vh;overflow:auto;background:#fff;border:1px solid #d9ddee;border-radius:12px;padding:20px 22px;color:#20222e;box-shadow:0 14px 44px rgba(30,35,80,.2);}
.modal h3{margin:0 0 6px;font-size:17px;}

/* ============ 场控抽题面板（题库/组卷 → 实时） ============ */
.qb-cand{max-height:330px;overflow:auto;border:1px solid #e2e5f0;border-radius:8px;margin:8px 0 2px;background:#fff;}
.qb-row{display:flex;align-items:flex-start;gap:8px;padding:8px 10px;border-bottom:1px dashed #e6e9f4;font-size:13px;cursor:pointer;}
.qb-row:last-child{border-bottom:none;}
.qb-row:hover{background:#f3f5fc;}
.qb-row input{width:auto;margin:3px 0 0;flex:none;accent-color:#3b63d9;cursor:pointer;}
.qb-row .qb-main{flex:1;min-width:0;word-break:break-all;}
.qb-row .qb-opts{color:#565a72;font-size:12px;margin-top:2px;word-break:break-all;}
.qb-row .qb-why{color:#d64537;font-size:12px;margin-top:2px;}
.qb-row.off{opacity:.55;cursor:not-allowed;}
.qb-row.off input{cursor:not-allowed;}

/* ============ 通用弹窗（后台抽题等） ============ */
[hidden]{display:none !important;}
.dlg-mask{position:fixed;inset:0;background:rgba(18,22,44,.45);z-index:1200;display:flex;align-items:flex-start;justify-content:center;padding:4vh 16px 20px;}
.dlg{width:min(900px,100%);max-height:92vh;background:#fff;border:1px solid #d9ddee;border-radius:12px;display:flex;flex-direction:column;box-shadow:0 18px 60px rgba(30,35,80,.2);}
.dlg-head{display:flex;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid #e6e9f4;font-size:16px;font-weight:700;flex:none;}
.dlg-x{margin-left:auto;background:none;border:none;color:#d64537;font-size:24px;line-height:1;cursor:pointer;padding:0 6px;}
.dlg-x:hover{background:none;color:#b3372b;}
.dlg-body{padding:12px 16px;overflow:auto;}
.dlg-foot{display:flex;align-items:center;gap:8px;padding:10px 16px;border-top:1px solid #e6e9f4;flex-wrap:wrap;flex:none;}
.dlg-foot button{margin:0;}
.dlg-tip{font-size:14px;color:#8a6200;min-height:20px;text-align:left;}
.dlg-tip.ok{color:#1d9e5b;}
.dlg-tip.bad{color:#d63a2a;}

/* ============ 主持人控制台（整合面板内分组） ============ */
.ctl-badges{display:flex;align-items:center;flex-wrap:wrap;}
.ctl-sec{padding:14px 2px 2px;}
.ctl-sec + .ctl-sec{border-top:1px solid #edf0f8;margin-top:14px;}
.ctl-bar{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:8px;}
.ctl-name{font-size:14px;font-weight:700;color:#2648b0;flex:none;}
.ctl-hint{font-size:12px;line-height:1.6;}
.ctl-btns{display:flex;flex-wrap:wrap;align-items:center;gap:8px;}
.ctl-btns button{margin:0;}
.ctl-btns input{width:200px;flex:none;margin:0;padding:9px 10px;}
@media (max-width:600px){.ctl-btns input{width:100%;}}

/* ============ 实时控场：模式/公布下拉、竖向滚动条、作答分布 ============ */
.ctl-sel{padding:7px 10px;background:#fff;color:#20222e;border:1px solid #ccd2e4;border-radius:6px;font-size:14px;}
.ctl-sel:disabled{background:#eef0f6;color:#8a90a6;cursor:not-allowed;}
/* 控制面板：固定 / 悬浮两模式（悬浮默认右下角，按住顶部可拖动，位置记忆） */
.ctl-head-right{display:inline-flex;align-items:center;gap:6px;}
.dock-btn{padding:4px 10px;margin:0;font-size:12px;line-height:1.4;border:1px solid #ccd2e4;background:#fff;color:#5a6078;border-radius:6px;cursor:pointer;}
.dock-btn.on{background:#3b63d9;border-color:#3b63d9;color:#fff;}
#ctl-fold{display:none;}
#ctl-panel.float{position:fixed;right:18px;bottom:18px;width:360px;max-width:calc(100vw - 36px);max-height:calc(100vh - 36px);overflow:auto;z-index:1000;box-shadow:0 12px 32px rgba(16,24,64,.22);}
#ctl-panel.float #ctl-head{cursor:grab;}
#ctl-panel.float #ctl-fold{display:inline-block;}
#ctl-panel.float.collapsed{width:250px;}
#ctl-panel.float.collapsed #ctl-head{cursor:grab;}
#ctl-panel.float.collapsed .ctl-sec{display:none;}
.scroll-area{max-height:calc(100vh - 330px);min-height:140px;overflow-y:auto;padding-right:4px;scrollbar-width:thin;}
@media (max-width:820px){.scroll-area{max-height:38vh;}}
.dlg-sm{max-width:340px;}
.dist-panel{margin-bottom:10px;padding:10px 12px;background:#f5f7fc;border:1px solid #e3e6f2;border-radius:8px;}
.dist-row{display:flex;align-items:center;gap:10px;padding:5px 8px;margin:3px 0;border-radius:6px;cursor:pointer;background:#fff;border:1px solid transparent;}
.dist-row:hover{border-color:#3b63d9;background:#eef2ff;}
.dist-key{min-width:22px;height:22px;flex:none;border-radius:50%;background:#20222e;color:#fff;font-weight:700;font-size:13px;display:flex;align-items:center;justify-content:center;padding:0 6px;}
.dist-key.wide{border-radius:11px;font-size:12px;letter-spacing:.5px;}
.dist-track{flex:1;height:12px;background:#e3e6f2;border-radius:6px;overflow:hidden;}
.dist-fill{display:block;height:100%;background:linear-gradient(90deg,#3b63d9,#6b8aff);border-radius:6px;}
.dist-n{flex:none;font-size:12px;color:#5a6078;min-width:86px;text-align:right;}
/* 分布行悬浮名单：鼠标移到选项条即时显示（不响应鼠标事件，避免遮挡闪烁） */
#dist-tip{position:fixed;z-index:1300;width:250px;max-height:320px;overflow:auto;background:#fff;border:1px solid #ccd2e4;border-radius:8px;box-shadow:0 10px 28px rgba(16,24,64,.18);padding:10px 12px;font-size:13px;pointer-events:none;}
.dist-tip-title{font-weight:700;color:#2648b0;margin-bottom:6px;}
.dist-tip-name{padding:3px 0;border-bottom:1px dashed #eef0f8;}
.dist-tip-name:last-child{border-bottom:none;}
#dist-tip .muted{padding:4px 0;}
.name-line{padding:7px 4px;border-bottom:1px dashed #e3e6f2;color:#20222e;}
.name-line:last-child{border-bottom:none;}

/* ============ 学生端：随机刷题反馈卡 ============ */
.rnd-ok{font-size:20px;font-weight:700;color:#1d8f57;}
.rnd-no{font-size:20px;font-weight:700;color:#d63a2a;}
.rnd-ana-box{margin-top:12px;padding:10px 12px;background:#f4f6fb;border:1px solid #e3e6f2;border-radius:6px;color:#20222e;}

/* ============ 账号管理：表头排序 + 逐列筛选行 ============ */
.tbl thead th.sortable{cursor:pointer;user-select:none;}
.tbl thead th.sortable:hover{color:#1a73e8;}
.tbl thead th.sortable .ar{display:inline-block;min-width:12px;margin-left:3px;color:#1a73e8;font-size:11px;}
.tbl tr.f-row td{background:#f4f6fb;padding:5px 4px;border-bottom:1px solid #dde1f0;vertical-align:middle;}
.tbl tr.f-row:hover td{background:#f4f6fb;}
.tbl .f-row input,.tbl .f-row select{width:100%;box-sizing:border-box;padding:4px 6px;font-size:12px;color:#20222e;background:#fff;border:1px solid #ccd2e4;border-radius:4px;min-width:0;}
.tbl .f-row select{cursor:pointer;}
.tbl .f-row input:focus,.tbl .f-row select:focus{outline:none;border-color:#3b63d9;}

/* ============ 账号管理：账号归属列 ============ */
.tbl td.td-owner{min-width:118px;}
.own-sch{display:block;font-size:13px;color:#20222e;white-space:nowrap;}
body:not(.show-school) .own-sch,body:not(.show-school) .f-sch{display:none;}   /* 归属学校仅平台超管可见 */
.own-by{display:block;font-size:12px;color:#7a7f96;margin-top:2px;white-space:nowrap;}

/* ============ 账号管理：行内操作（常用 2 个 + “更多”下拉） ============ */
.tbl td.td-act{white-space:nowrap;}
.act{position:relative;display:inline-flex;gap:6px;align-items:center;}
.act>button.sm{padding:5px 9px;}
.act>.act-more{padding:5px 7px;}
.act-menu{position:absolute;right:0;top:calc(100% + 6px);min-width:132px;background:#fff;
  border:1px solid #e3e6f0;border-radius:10px;box-shadow:0 10px 26px rgba(16,22,52,.16);
  padding:6px;display:flex;flex-direction:column;gap:2px;z-index:60;}
.act-menu.up{top:auto;bottom:calc(100% + 6px);}
.act-menu[hidden]{display:none;}
.act-menu button{width:100%;margin:0;text-align:left;background:none;color:#232638;
  font-size:13.5px;padding:8px 11px;border-radius:7px;}
.act-menu button:hover{background:#f1f3fa;}
.act-menu button.danger-item{color:#b3362a;}
.act-menu button.danger-item:hover{background:#fdeeec;}
.act-sep{height:1px;background:#eceef7;margin:4px 2px;}

/* ============ 学生端：切走标签页的回归提示横幅 ============ */
.away-warn{position:fixed;bottom:0;left:0;right:0;z-index:600;background:#fff7e6;color:#8a4b00;
  border-top:2px solid #f5c26b;padding:10px 16px;text-align:center;font-size:14.5px;
  box-shadow:0 -3px 12px rgba(60,40,0,.12);line-height:1.6;}
.away-warn b{color:#c2410c;}

/* ============ 学生端：材料大题（材料正文 + 逐小题作答卡） ============ */
.mat-text{background:#fffdf2;border:1px solid #f0e3bb;border-left:4px solid #e0a12e;
  border-radius:8px;padding:14px 16px;margin:4px 0 14px;color:#3d3320;
  white-space:pre-wrap;line-height:1.9;font-size:15px;max-height:34vh;overflow:auto;}
.mat-tip{margin:2px 0 10px;font-size:13px;}
.mat-card{border:1px solid #dfe3f1;border-radius:10px;padding:12px 14px;margin:12px 0;
  background:#fff;box-shadow:0 2px 8px rgba(20,30,80,.04);}
.mat-card.done{background:#fbfcfd;}
.mat-qhead{display:flex;align-items:flex-start;gap:8px;margin-bottom:4px;flex-wrap:wrap;}
.mat-no{flex:none;font-size:12px;font-weight:700;color:#fff;background:#3b63d9;
  border-radius:5px;padding:1px 8px;line-height:1.8;margin-top:1px;}
.mat-tag{flex:none;font-size:12px;color:#7a5c00;background:#f7edcf;border-radius:5px;
  padding:1px 8px;line-height:1.8;margin-top:1px;}
.mat-qtext{flex:1;min-width:200px;font-size:15px;color:#20222e;font-weight:600;word-break:break-all;}
.mat-opts{margin:2px 0 6px;}
.mat-card .opt-item{margin:6px 0;}
.mat-card .opt-item.unclickable{opacity:.6;}
.mat-ans{margin-top:4px;padding:8px 12px;background:#e9f7ef;border:1px solid #bfe5d1;
  border-radius:6px;color:#14623a;font-size:14px;}
.mat-ans .muted{color:#3f7a58;}
.mat-ana{margin-top:6px;padding-top:6px;border-top:1px dashed #bfe5d1;color:#4a5a50;
  white-space:pre-wrap;line-height:1.7;}
.mat-foot{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:8px;min-height:30px;}
.mat-foot .m-sub{margin:0;padding:8px 16px;background:#1d8f57;border-radius:6px;}
.mat-foot .m-sub:hover{background:#21a565;}
.mat-state{margin-left:auto;font-size:13.5px;color:#5f637a;}
.mat-card.done .mat-state{color:#a06d00;font-weight:600;}

/* ============ 教师端：材料大题作答分布（逐小题分组） ============ */
.mat-dist{border-top:1px dashed #dfe3f1;padding:8px 2px 2px;}
.mat-dist:first-of-type{border-top:none;padding-top:2px;}
.mat-dist-t{font-size:13px;color:#2648b0;font-weight:600;margin-bottom:2px;word-break:break-all;}