:root{
  --ink:#232a3d; --paper:#f4f1e8; --accent:#f2a03d; --p1:#e2503b; --p2:#3b82e0;
  --good:#2e9e5b; --card:#ffffff; --shadow:0 10px 28px rgba(20,28,50,.12);
  --r:16px; --pad:18px;
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{min-height:100%}
body{
  font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);
  background:
    radial-gradient(900px 420px at 85% -10%, rgba(242,160,61,.28), transparent 60%),
    radial-gradient(700px 380px at -10% 110%, rgba(59,130,224,.2), transparent 55%),
    var(--paper);
  min-height:100vh;
}
button{cursor:pointer;font-family:inherit;border:none}
input,select{font-family:inherit;border:2px solid #e2ded2;border-radius:12px;padding:12px 14px;font-size:16px;background:#fff}
input:focus,select:focus{outline:none;border-color:var(--accent)}
.hidden{display:none!important}
.loading{position:fixed;inset:0;background:rgba(255,255,255,.7);z-index:999;display:flex;align-items:center;justify-content:center;font-size:20px}
.loading.hide{display:none}

/* 视图切换 */
.view{display:none;min-height:100vh;flex-direction:column}
.view.active{display:flex;animation:fadeIn .25s}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* 顶部栏 */
.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 22px;background:rgba(255,255,255,.75);backdrop-filter:blur(8px);box-shadow:0 1px 0 rgba(0,0,0,.05);gap:10px}
.me{font-weight:800;font-size:18px;display:flex;align-items:center;gap:8px}
.rank-badge{background:linear-gradient(135deg,#ffd76a,#f2a03d);color:#5c3a04;font-size:12px;font-weight:800;padding:3px 9px;border-radius:999px}
.points{font-weight:800;font-size:18px;color:var(--accent)}
.top-right{display:flex;gap:8px}
.top-right button,.ghost{background:transparent;border:1.5px solid #c9c3b1;color:var(--ink);border-radius:999px;padding:8px 16px;font-weight:700}
.top-right button:hover,.ghost:hover{background:#fff}
.topbar-title{font-weight:800;font-size:18px}

/* 登录 */
#loginView{align-items:center;justify-content:center;padding:24px}
.login-card{max-width:420px;width:100%;text-align:center}
.logo{font-size:40px;font-weight:900;letter-spacing:1px;color:var(--ink)}
.logo span{color:var(--accent)}
.tagline{color:#8a8573;margin:8px 0 22px}
.login-box{background:var(--card);border-radius:22px;padding:30px 28px;box-shadow:var(--shadow)}
.login-box h2{margin-bottom:18px}
.login-box input{width:100%;margin-bottom:14px}
.login-box button,.go{width:100%;background:linear-gradient(135deg,#ffb64a,#f28c1e);color:#5c3400;font-size:17px;font-weight:800;border-radius:14px;padding:14px}
.login-box button:active,.go:active{transform:scale(.98)}
.err{color:#d43;font-size:14px;margin-top:10px;min-height:18px}

/* 学生大厅 */
.student-wrap{flex:1;display:flex;align-items:center;justify-content:center;padding:30px}
.games-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,260px));gap:22px;width:100%;max-width:1120px}
.game-card{background:var(--card);border-radius:22px;padding:24px;box-shadow:var(--shadow);text-align:center;transition:transform .15s}
.game-card:hover{transform:translateY(-4px)}
.game-icon{font-size:52px}
.game-card h3{margin:10px 0 4px;font-size:20px}
.game-card p{color:#8a8573;font-size:13px;margin-bottom:16px;min-height:34px}
.game-card .go{width:auto;display:inline-block;padding:10px 28px;color:#fff;background:var(--ink)}

/* 游戏区 */
.game-area{flex:1;display:flex;align-items:center;justify-content:center;padding:20px}
.progbar{width:120px;height:8px;background:#e2ded2;border-radius:6px;overflow:hidden;margin-top:4px}
.progbar i{display:block;height:100%;background:var(--accent);transition:width .2s}
.game-head-center{text-align:center}
.game-score{font-weight:800;font-size:18px;color:var(--accent)}

/* 题目内容自定义样式都会在此定义 */
.puzzle{
  background:var(--card);border-radius:24px;box-shadow:var(--shadow);
  padding:34px 40px;text-align:center;max-width:760px;width:100%;
}
.puzzle .qnum{font-size:15px;color:#8a8573;font-weight:700;margin-bottom:14px}
.frac-inline{display:inline-flex;flex-direction:column;align-items:center;line-height:1;vertical-align:middle}
.frac-inline .n{font-size:.72em}.frac-inline .d{font-size:.72em}
.frac-inline .b{width:100%;height:3px;background:var(--ink);margin:2px 0}
.big{font-size:64px;font-weight:800;display:flex;align-items:center;justify-content:center;gap:22px;flex-wrap:wrap;margin:16px 0 28px}
.big .frac-inline .n,.big .frac-inline .d{font-size:.9em}
.op-sep{font-size:56px;color:var(--accent);font-weight:800}

.options{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:14px;max-width:600px;margin:0 auto}
.opt{background:#fff;border:2.5px solid #e6e1d2;border-radius:16px;padding:18px 10px;font-size:30px;font-weight:800;color:var(--ink);transition:.12s}
.opt:not(:disabled):hover{border-color:var(--accent);background:#fff}
.opt:not(:disabled):active{transform:scale(.96)}
.opt.correct{background:var(--good)!important;color:#fff!important;border-color:var(--good)}
.opt.wrong{background:#d9455c!important;color:#fff!important;border-color:#d9455c}
.opt:disabled{opacity:1;cursor:default}

/* 消消乐排序 */
.sort-panel{display:flex;flex-direction:column;gap:10px;align-items:center}
.sort-btn-block{display:flex;align-items:center;gap:16px;font-size:40px;font-weight:800}
.clickable-box{border:2.5px dashed var(--p2);border-radius:16px;padding:14px 22px;cursor:pointer;font-size:40px;font-weight:800;min-width:70px;background:#fff;color:var(--p2)}
.clickable-box:not(:disabled):hover{background:#ecf3ff}
.clickable-box.correct{background:var(--good)!important;color:#fff;border-style:solid}
.clickable-box.wrong{background:#d9455c!important;color:#fff;border-style:solid}
.dot{color:#c9c3b1}

/* 计算顺序：可点击运算符 */
.order-line{display:flex;align-items:center;gap:10px;font-size:34px;font-weight:800;flex-wrap:wrap;justify-content:center;background:#fff;border-radius:18px;border:2.5px solid #e6e1d2;padding:20px}
.onum{font-size:38px;font-weight:800;min-width:44px;text-align:center}
.symbox{display:inline-flex;align-items:center;justify-content:center;min-width:54px;height:54px;border:2.5px solid var(--p2);border-radius:12px;font-size:30px;font-weight:800;cursor:pointer;color:var(--p2);background:#fff}
.symbox:not(:disabled):hover{background:#ecf3ff}
.symbox.done{background:var(--accent);border-color:var(--accent);color:#5c3400}
.symbox.active{background:var(--p2);color:#fff;border-color:var(--p2)}
.paren{color:var(--accent);font-size:44px;font-weight:800}
.step-hint{font-size:16px;color:#8a8573;margin-top:16px;min-height:22px}
.pointer-arrow{display:inline-block;font-size:22px;color:var(--accent)}

/* 游戏结果 */
.game-result{position:fixed;inset:0;background:rgba(16,20,34,.78);backdrop-filter:blur(4px);z-index:60;display:flex;align-items:center;justify-content:center}
.game-result.hidden{display:none}
.res-card{background:#fff;border-radius:26px;padding:38px 46px;text-align:center;box-shadow:0 20px 60px rgba(0,0,0,.4);max-width:420px;width:90%}
#resEmoji{font-size:70px}
.res-card h2{margin:8px 0}
#resStats{color:#6b6556;margin-bottom:6px;font-size:16px}
#resPoints{font-size:26px;font-weight:900;color:var(--accent);margin:10px 0 20px}
.res-card button{display:block;width:100%;margin-bottom:10px}
.res-card .ghost{width:100%;padding:13px}

/* 排行榜 */
.board-list{max-width:700px;margin:24px auto;padding:0 20px;list-style:none}
.board-list li{background:#fff;border-radius:14px;box-shadow:var(--shadow);display:flex;align-items:center;gap:14px;padding:14px 18px;margin-bottom:10px}
.board-list .rk{font-size:22px;font-weight:900;width:44px;text-align:center}
.board-list .name{flex:1;font-weight:700}
.board-list .pts{font-weight:800;color:var(--accent)}
.board-list .cls{color:#a09a88;font-size:13px}

/* 教师后台 */
.teach-tabs{display:flex;gap:8px;padding:18px 22px 0}
.tab{background:#fff;border-radius:12px 12px 0 0;padding:12px 22px;font-weight:800;border:1.5px solid transparent;color:#8a8573}
.tab.active{color:var(--ink);border-color:#e6e1d2;border-bottom-color:#fff;position:relative}
.teach-panel{padding:20px 22px;max-width:1000px;margin:0 auto;width:100%}
.teach-panel h3{margin-bottom:14px}
.row-inline{display:flex;gap:10px;margin-bottom:14px;flex-wrap:wrap}
.row-inline input,.row-inline select{flex:1;min-width:150px}
.row-inline .go{width:auto;padding:12px 18px;color:#5c3400}
#classSelect{min-width:180px}
.stu-table{width:100%;border-collapse:collapse;background:#fff;border-radius:14px;overflow:hidden;box-shadow:var(--shadow)}
.stu-table th,.stu-table td{padding:12px 14px;text-align:center;border-bottom:1px solid #ece8dc}
.stu-table th{background:#faf7ee;font-weight:800}
.award-inline{display:flex;gap:6px;align-items:center;justify-content:center}
.award-inline input{width:64px;padding:6px 8px;text-align:center}
.award-inline button{padding:8px 12px;border-radius:9px;background:#e6e1d2;font-weight:800;color:var(--ink)}
.award-inline button:active{transform:scale(.95)}

.bank-edit{margin-top:6px;border-top:1px solid #ece8dc;padding-top:12px}
.bank-edit .q-row{display:flex;gap:6px;align-items:center;margin-bottom:6px}
.bank-edit .q-row input{flex:1;padding:8px 10px}
.bank-edit .q-row .qlabel{width:70px;color:#8a8573;font-size:13px}

/* 弹窗 */
.modal{position:fixed;inset:0;background:rgba(16,20,34,.6);z-index:70;display:flex;align-items:center;justify-content:center}
.modal.hidden{display:none}
.modal-card{background:#fff;border-radius:20px;padding:26px 28px;max-width:520px;width:92%;max-height:86vh;overflow:auto}
.modal-card h3{margin-bottom:16px}
.modal-actions{display:flex;gap:10px;margin-top:18px}
.modal-actions .go{width:auto;flex:1;right:0;background:var(--ink);color:#fff}
.modal-actions .ghost{flex:1}
.stu-add-row{display:flex;gap:6px;margin-bottom:8px;align-items:center}
.stu-add-row input{flex:1;padding:9px 10px}
.stu-add-row .del{background:#f3d9d9;color:#b23;border-radius:8px;padding:8px 12px;font-weight:800}

/* 关卡闯关地图 */
.level-wrap{flex:1;padding:24px;overflow:auto}
.level-map{max-width:1000px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:16px}
.level-node{background:var(--card);border-radius:18px;box-shadow:var(--shadow);padding:20px 14px;text-align:center;cursor:pointer;transition:transform .15s;border:2.5px solid transparent}
.level-node:not(.locked):hover{transform:translateY(-4px);border-color:var(--accent)}
.level-node .ln-num{width:56px;height:56px;margin:0 auto 10px;border-radius:50%;background:linear-gradient(135deg,#ffb64a,#f28c1e);color:#5c3400;font-size:24px;font-weight:900;display:flex;align-items:center;justify-content:center}
.level-node .ln-name{font-weight:800;font-size:15px;margin-bottom:4px}
.level-node .ln-desc{color:#8a8573;font-size:12px;margin-bottom:8px}
.level-node .ln-stars{color:var(--accent);font-size:16px;letter-spacing:2px;min-height:20px}
.level-node.locked{opacity:.55;cursor:not-allowed;background:#efede3}
.level-node.locked .ln-num{background:#cfcabb;color:#fff;font-size:18px}
.level-node.done{border-color:#cfe7d4}
.level-node.done .ln-num{background:linear-gradient(135deg,#4cbb7a,#2e9e5b);color:#fff}

/* 段位与星星徽章 */
.rank-badge{display:inline-block;padding:2px 10px;border-radius:20px;background:linear-gradient(135deg,#fff7df,#ffe08a);color:#7a5b00;font-weight:800;font-size:13px}
.stars-badge{display:inline-block;padding:2px 9px;border-radius:14px;background:#fff8e6;color:#b8860b;font-weight:800;font-size:13px}
.stu-name{font-weight:700}

/* 教师操作区 */
.award-inline{display:flex;gap:5px;flex-wrap:wrap;align-items:center}
.award-inline input{width:64px;padding:5px;border:1px solid var(--line);border-radius:8px}
.award-inline button,.award-ops button{background:var(--btn2);border:none;color:#5b4770;border-radius:8px;padding:6px 10px;font-weight:700;cursor:pointer;font-size:13px}
.award-ops{display:flex;gap:5px;margin-top:6px;flex-wrap:wrap}
.award-ops button.mini{background:#f3edff;color:#5b4770;padding:4px 8px}
.award-ops button:hover{background:#e6dcff}
.stu-table th,.stu-table td{color:#3a3542}
.stu-table th{background:#f6f2ff;color:#5b4770}

/* 名单导出 */
.pts{font-weight:800;color:var(--accent)}

@media(max-width:640px){
  .games-grid{grid-template-columns:1fr 1fr;gap:12px}
  .game-card{padding:16px 10px}
  .game-icon{font-size:38px}
  .big{font-size:44px;gap:12px}
  .options{grid-template-columns:1fr 1fr}
  .puzzle{padding:22px 16px}
}

/* =====================================================================
   数学大闯关 · 新增样式
===================================================================== */

/* ---------- 学生大厅 ---------- */
.hall{flex:1;max-width:900px;width:100%;margin:0 auto;padding:26px 22px 60px;display:flex;flex-direction:column;gap:22px}
.rank-card{display:flex;align-items:center;gap:20px;background:linear-gradient(135deg,#fff8e8,#fff);border-radius:22px;padding:22px 26px;box-shadow:var(--shadow)}
.rc-icon{font-size:52px;line-height:1}
.rc-body{flex:1}
.rc-tier{font-size:26px;font-weight:900;margin-bottom:10px}
.rc-bar{height:12px;background:#ece8dc;border-radius:8px;overflow:hidden}
.rc-bar i{display:block;height:100%;background:linear-gradient(90deg,#ffb64a,#f28c1e);transition:width .4s}
.rc-hint{font-size:13px;color:#8a8573;margin-top:8px}
.rc-stars{text-align:center;padding-left:20px;border-left:1px solid #ece8dc}
.rc-stars-num{font-size:34px;font-weight:900;color:var(--accent)}
.rc-stars-cap{font-size:12px;color:#8a8573}

.big-enter{display:flex;flex-direction:column;align-items:center;gap:6px;background:linear-gradient(135deg,#ffb64a,#f28c1e);color:#5c3400;border-radius:22px;padding:26px;box-shadow:var(--shadow);transition:transform .15s}
.big-enter:hover{transform:translateY(-3px)}
.big-enter:active{transform:scale(.99)}
.be-icon{font-size:40px}
.be-text{font-size:26px;font-weight:900}
.be-sub{font-size:13px;opacity:.75}

.practice-block{background:#fff;border-radius:22px;padding:20px 22px;box-shadow:var(--shadow)}
.pb-title{font-weight:800;font-size:17px;margin-bottom:14px}
.pb-title span{font-weight:500;font-size:13px;color:#8a8573;margin-left:8px}
.practice-block .games-grid{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;max-width:none}
.practice-block .game-card{padding:16px 10px;cursor:pointer}
.practice-block .game-icon{font-size:34px}
.practice-block .game-card h3{font-size:16px;margin:6px 0 2px}
.practice-block .game-card p{font-size:12px;margin:0;min-height:0}

/* ---------- 关卡地图（分章） ---------- */
.act-sec{max-width:1000px;margin:0 auto 30px;width:100%}
.act-head{display:flex;align-items:center;gap:12px;margin-bottom:14px;padding:0 4px}
.act-icon{font-size:26px}
.act-name{font-weight:900;font-size:19px}
.act-range{font-size:12px;color:#8a8573;background:#fff;border-radius:999px;padding:3px 10px}
.level-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(155px,1fr));gap:14px}
.level-node .ln-mech{font-size:11px;color:var(--accent);font-weight:700;margin-bottom:8px}
.level-node .ln-stars{letter-spacing:1px}

/* ---------- 题目 token ---------- */
.tk-num{font-weight:900}
.tk-op{color:var(--accent);font-weight:900;padding:0 2px}
.tk-slot{display:inline-flex;align-items:center;justify-content:center;min-width:52px;height:56px;border:2.5px dashed #c9c3b1;border-radius:12px;color:#b8b2a1;font-size:34px;vertical-align:middle}
.tk-slot--live{border-style:solid;border-color:var(--accent);color:var(--ink);background:#fff8e8}
.q-hint{font-size:14px;color:#8a8573;margin:-10px 0 18px}

/* ---------- 九宫格键盘 ---------- */
.pad{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;max-width:330px;margin:8px auto 0}
.key{background:#fff;border:2px solid #e6e1d2;border-radius:14px;padding:16px 0;font-size:24px;font-weight:800;color:var(--ink);transition:.1s}
.key:active{transform:scale(.95);background:#fff8e8}
.key--fn{font-size:16px;color:#8a8573}
.pad-actions{display:flex;gap:12px;justify-content:center;margin-top:16px;flex-wrap:wrap}
.pad-actions .go{width:auto;padding:13px 34px}
.pad-actions .ghost{padding:13px 22px}

/* ---------- 分数输入 ---------- */
.frac-input{display:inline-flex;flex-direction:column;align-items:center;line-height:1;vertical-align:middle;margin-left:8px}
.frac-input .b{width:100%;min-width:56px;height:3px;background:var(--ink);margin:3px 0}
.fi-part{padding:4px 12px;border-radius:10px;border:2.5px dashed #c9c3b1;cursor:pointer}
.fi-part.on{border-style:solid;border-color:var(--accent);background:#fff8e8}
.fi-val{font-size:38px;font-weight:900;min-width:34px;display:inline-block;text-align:center}

/* ---------- 逐格揭示（因数） ---------- */
.fx-bar{font-size:15px;color:#8a8573;margin-bottom:12px}
.fx-bar b{color:var(--accent);font-size:18px}
.fx-slots{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:16px}
.fx-slot{width:58px;height:58px;border:2.5px dashed #c9c3b1;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:900;color:var(--good)}
.fx-slot:not(:empty){border-style:solid;border-color:var(--good);background:#eefaf1}
.fx-found{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-bottom:14px;min-height:34px}
.fx-chip{background:#eefaf1;color:var(--good);border:1.5px solid #bfe3ca;border-radius:999px;padding:5px 14px;font-weight:800}
.fx-feedback{font-size:15px;color:#8a8573;min-height:24px;margin-bottom:10px}
.fx-feedback.ok{color:var(--good);font-weight:700}
.fx-feedback.no{color:#d9455c;font-weight:700}
.fx-current{font-size:15px;color:#8a8573;margin-bottom:6px}
.fx-current b{font-size:22px;color:var(--ink)}

/* ---------- 配对（公因数） ---------- */
.pair-bar{font-size:15px;color:#8a8573;margin-bottom:14px}
.pair-wrap{display:flex;gap:18px;justify-content:center;margin-bottom:14px;flex-wrap:wrap}
.pair-col{flex:1;min-width:180px;background:#faf7ee;border-radius:16px;padding:14px}
.pair-col-t{font-weight:800;margin-bottom:10px;font-size:15px}
.pair-num{display:inline-block;margin:4px;min-width:52px;padding:10px 6px;border-radius:12px;background:#fff;border:2px solid #e6e1d2;font-size:19px;font-weight:800}
.pair-num:not(:disabled):active{transform:scale(.95)}
.pair-num.hit{background:#eefaf1;border-color:var(--good);color:var(--good)}

/* ---------- 面积模型 ---------- */
.am{margin-bottom:18px}
.am-top{font-size:15px;color:#8a8573;margin-bottom:12px}
.am-head{display:flex;justify-content:center;gap:6px;margin-bottom:6px}
.am-col,.am-row{background:#fff;border:2px solid #e6e1d2;border-radius:10px;font-weight:800;color:var(--p2);font-size:15px}
.am-col{width:52px;padding:6px 0}
.am-row{width:38px;padding:6px 0}
.am-col.on,.am-row.on{background:var(--p2);color:#fff;border-color:var(--p2)}
.am-body{display:flex;justify-content:center;gap:6px}
.am-rows{display:flex;flex-direction:column;gap:4px}
.am-grid{display:grid;gap:4px}
.am-cell{width:52px;height:44px;background:#fff;border:2px solid #e6e1d2;border-radius:8px}
.am-cell.c{background:#cfe0ff;border-color:#9fbcff}
.am-cell.r{background:#ffe0b8;border-color:#ffc270}
.am-cell.x{background:#ffb1a3;border-color:#e2503b}
.am-readout{font-size:15px;color:#8a8573;margin-top:12px}
.am-readout b{color:var(--ink);font-size:18px}

/* ---------- 反馈 ---------- */
.feedback{margin-top:18px;border-radius:14px;padding:14px 18px;text-align:left;max-width:640px}
.feedback--ok{background:#eefaf1;border:1.5px solid #bfe3ca}
.feedback--no{background:#fdeef1;border:1.5px solid #f0c2cc}
.fb-title{font-weight:900;margin-bottom:4px}
.fb-ans{font-size:17px}
.fb-hint{font-size:13px;color:#8a8573;margin-top:4px}
.flash{position:fixed;left:50%;bottom:40px;transform:translateX(-50%);background:rgba(35,42,61,.9);color:#fff;padding:10px 22px;border-radius:999px;font-weight:700;opacity:0;transition:.2s;pointer-events:none}
.flash.on{opacity:1}

/* ---------- 结算 ---------- */
.res-stars{font-size:40px;color:var(--accent);letter-spacing:6px;margin:4px 0 10px}
.res-hint{font-size:14px;color:#8a8573;margin-bottom:16px}
.options--comp{grid-template-columns:repeat(3,1fr);max-width:460px}
.options--comp .opt{font-size:40px;padding:14px 0}

/* ---------- 教师后台补充 ---------- */
.muted{font-size:13px;color:#8a8573;font-weight:500}
.stu-table td.up{color:var(--good);font-weight:800}
.stu-table td.down{color:#d9455c;font-weight:800}
.stu-table td.note{color:#8a8573;font-size:13px}
#rosterText{width:100%;font-family:ui-monospace,Consolas,monospace;font-size:13px;box-sizing:border-box;border:2px solid #e2ded2;border-radius:12px;padding:10px}

/* =====================================================================
   课堂双人 PK（希沃大屏）
===================================================================== */
.pk-body{overflow:hidden;height:100vh}
.pk-setup{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;padding:24px;overflow:auto}
.pk-setup-card{background:#fff;border-radius:24px;box-shadow:var(--shadow);padding:32px 36px;max-width:520px;width:100%}
.pk-setup-card h1{font-size:28px;margin-bottom:6px}
.pk-setup-sub{color:#8a8573;font-size:14px;margin-bottom:22px}
.pk-setup-row{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.pk-setup-row label{width:88px;font-weight:800;flex-shrink:0}
.pk-setup-row select{flex:1}
.pk-setup-note{font-size:13px;color:#8a8573;background:#faf7ee;border-radius:12px;padding:12px 14px;margin:6px 0 18px;line-height:1.7}
.pk-setup-card .go{width:100%}

.pk-match{display:flex;flex-direction:column;height:100vh}
.pk-topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:rgba(255,255,255,.85);box-shadow:0 1px 0 rgba(0,0,0,.06)}
.pk-round{font-weight:900;font-size:20px}
.pk-timer{font-weight:900;font-size:22px;color:var(--accent)}
.pk-wins{font-weight:900;font-size:20px;color:#8a8573}
.pk-body-wrap{flex:1;display:flex;min-height:0}
.pk-side{flex:1;display:flex;flex-direction:column;padding:18px 24px;min-width:0}
.pk-side--a{background:linear-gradient(180deg,rgba(226,80,59,.06),transparent 40%)}
.pk-side--b{background:linear-gradient(180deg,rgba(59,130,224,.06),transparent 40%)}
.pk-divider{width:3px;background:#e6e1d2;margin:18px 0}
.pk-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.pk-avatar{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:900;color:#fff;font-size:17px}
.pk-side--a .pk-avatar{background:var(--p1)}
.pk-side--b .pk-avatar{background:var(--p2)}
.pk-pname{font-weight:900;font-size:22px;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.pk-score{font-size:40px;font-weight:900;color:var(--accent)}
.pk-disp{font-size:46px;font-weight:800;display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap;min-height:110px;background:#fff;border-radius:20px;box-shadow:var(--shadow);padding:14px}
.pk-disp .frac-inline .n,.pk-disp .frac-inline .d{font-size:.72em}
.pk-opts{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}
.pk-opt{background:#fff;border:3px solid #e6e1d2;border-radius:18px;padding:22px 10px;font-size:32px;font-weight:900;color:var(--ink);transition:.1s;touch-action:manipulation}
.pk-opt .frac-inline .n,.pk-opt .frac-inline .d{font-size:.72em}
.pk-opt:active{transform:scale(.97)}
.pk-opt.ok{background:var(--good);border-color:var(--good);color:#fff}
.pk-opt.ok .tk-op,.pk-opt.ok .tk-num{color:#fff}
.pk-opt.no{background:#d9455c;border-color:#d9455c;color:#fff}
.pk-side-state{text-align:center;font-weight:800;font-size:17px;color:#8a8573;margin-top:14px;min-height:26px}
.pk-teacher{display:flex;align-items:center;gap:10px;padding:12px 24px;background:rgba(255,255,255,.9);box-shadow:0 -1px 0 rgba(0,0,0,.06);flex-wrap:wrap}
.pk-teacher-label{font-weight:800;font-size:13px;color:#8a8573;margin-right:4px}
.pk-btn{background:#fff;border:2px solid #d9d3c2;border-radius:12px;padding:11px 20px;font-weight:800;font-size:15px;color:var(--ink)}
.pk-btn:active{transform:scale(.97)}
.pk-btn--primary{background:linear-gradient(135deg,#ffb64a,#f28c1e);border-color:transparent;color:#5c3400}
.pk-btn--next{background:var(--ink);color:#fff;border-color:transparent}
@media(max-width:900px){
  .pk-disp{font-size:32px;min-height:80px}
  .pk-opt{font-size:24px;padding:16px 8px}
  .pk-pname{font-size:17px}
  .pk-score{font-size:30px}
}

/* ---------- 导入学生名单 ---------- */
.imp-tip{font-size:13px;color:#8a8573;line-height:1.7;background:#faf7ee;border-radius:12px;padding:10px 12px;margin-bottom:12px}
.imp-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:12px 0}
.imp-grid label{display:flex;flex-direction:column;gap:5px;font-size:13px;font-weight:700;color:#8a8573}
.imp-grid input{padding:9px 10px;font-size:15px}
.imp-file{margin-bottom:12px}
.imp-filebtn{display:inline-block;font-size:13px;font-weight:800;color:#5b4770;background:#f3edff;border-radius:10px;padding:9px 14px;cursor:pointer}
.imp-filebtn:active{transform:scale(.97)}
.imp-preview{font-size:13px;color:#8a8573;line-height:1.9;background:#f7f9ff;border-radius:12px;padding:10px 12px}
.imp-preview b{color:var(--ink)}
.imp-warn{margin-top:6px;color:#b26a00;background:#fff4e0;border-radius:8px;padding:6px 9px}
.imp-names{display:flex;flex-wrap:wrap;gap:5px;margin-top:9px}
.imp-chip{background:#fff;border:1px solid #e2ded2;border-radius:999px;padding:2px 9px;font-size:12px;color:var(--ink)}
#impNames,#impResult{width:100%;font-family:inherit;font-size:15px;line-height:1.7;color:var(--ink);background:#fff;border:2px solid #e2ded2;border-radius:12px;padding:12px 14px;resize:vertical}
#impNames:focus,#impResult:focus{outline:none;border-color:var(--accent)}
@media(max-width:560px){.imp-grid{grid-template-columns:1fr}}

/* =====================================================================
   练习场 / 闯关 · 双模式
===================================================================== */

/* ---------- 模式切换 ---------- */
.mode-switch{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.mode-btn{display:flex;flex-direction:column;align-items:center;gap:3px;background:#fff;border:2.5px solid #e6e1d2;border-radius:20px;padding:16px 12px;box-shadow:var(--shadow);transition:transform .15s,border-color .15s}
.mode-btn:hover{transform:translateY(-2px)}
.mode-btn.active{border-color:var(--accent);background:linear-gradient(135deg,#fff8e8,#fff)}
.mode-btn--challenge.active{border-color:var(--p2);background:linear-gradient(135deg,#eef4ff,#fff)}
.mb-icon{font-size:28px;line-height:1}
.mb-title{font-weight:900;font-size:19px}
.mb-sub{font-size:12px;color:#8a8573}
.mode-tip{font-size:13px;color:#8a8573;background:#fff;border-radius:14px;padding:12px 16px;box-shadow:var(--shadow);line-height:1.7}
.level-sum{display:flex;align-items:center;justify-content:space-between;font-weight:900;font-size:16px;padding:0 4px;color:var(--accent)}
.level-sum .ls-label{color:#8a8573;font-weight:700;font-size:14px}

/* 关卡地图：按章竖向堆叠（覆盖早期的扁平网格）
   必须显式给宽度：.level-map 是 .hall（纵向 flex）的子项，带 auto 外边距时会收缩到内容宽度，
   导致 .level-grid 只剩 2 列。width:100% 让它铺满大厅，卡片才排得开。 */
.level-map{display:block;width:100%;max-width:1000px;margin:0}

/* ---------- 关卡卡片上的练习进度 ---------- */
.level-node .ln-practice{margin-top:9px}
.ln-practice .lp-bar{height:7px;background:#ece8dc;border-radius:6px;overflow:hidden}
.ln-practice .lp-bar i{display:block;height:100%;background:linear-gradient(90deg,#7fd3a0,#2e9e5b);transition:width .3s}
.ln-practice .lp-text{font-size:11px;color:#8a8573;margin-top:5px;font-weight:800}
.ln-practice.full .lp-text{color:var(--good)}

/* ---------- 闯关倒计时条 ---------- */
.challenge-bar{display:flex;align-items:center;gap:20px;padding:10px 22px;background:rgba(255,255,255,.85);box-shadow:0 1px 0 rgba(0,0,0,.05)}
.ring{position:relative;width:48px;height:48px;flex-shrink:0}
.ring svg{transform:rotate(-90deg);display:block}
.ring-bg{fill:none;stroke:#e6e1d2;stroke-width:3}
.ring-fg{fill:none;stroke:#12B886;stroke-width:3;stroke-linecap:round;stroke-dasharray:94.25;stroke-dashoffset:0;transition:stroke-dashoffset .2s linear,stroke .2s}
.ring-time{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:900;color:var(--ink)}
.challenge-bar.warn .ring-time{color:#FF7A45}
.challenge-bar.danger .ring-time{color:#FF4D4F}
.qdots{display:flex;gap:7px;flex-wrap:wrap}
.qdot{width:15px;height:15px;border-radius:50%;background:#e6e1d2;display:inline-block}
.qdot--ok{background:var(--good)}
.qdot--no{background:#d9455c}
.qdot--cur{background:var(--accent);box-shadow:0 0 0 3px rgba(242,160,61,.28)}

.symbox.wrong{background:#fdeef1;border-color:#d9455c;color:#d9455c}

@media(max-width:560px){
  .mode-switch{grid-template-columns:1fr}
  .challenge-bar{gap:12px;padding:8px 14px}
}

/* =====================================================================
   希沃课堂大屏 · 全班闯关排行榜
   三栏：左选班级/关卡 · 中看名次 · 右看完成情况；底部是老师控制条
===================================================================== */
.screen-body{height:100vh;overflow:hidden;display:flex;flex-direction:column;background:radial-gradient(1200px 600px at 80% -10%,#26314b,transparent 60%),#161d2c;color:#eef2fb}
.screen-gate{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;padding:30px;text-align:center;font-size:20px;line-height:1.8;color:#c7d2e6}
.screen-gate .gate-card{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);border-radius:22px;padding:34px 40px;max-width:620px}
.screen-gate a{color:#ffc86b;font-weight:800}

.screen-top{display:flex;align-items:center;gap:18px;padding:16px 30px;background:rgba(255,255,255,.06);border-bottom:1px solid rgba(255,255,255,.1);flex-wrap:wrap}
.st-title{font-size:26px;font-weight:900;letter-spacing:.5px}
.st-live{margin-left:auto;display:flex;align-items:center;gap:9px;font-size:14px;color:#9fb0cc;font-weight:700}
.live-dot{width:10px;height:10px;border-radius:50%;background:#2e9e5b;animation:pulse 1.8s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(46,158,91,.6)}70%{box-shadow:0 0 0 10px rgba(46,158,91,0)}100%{box-shadow:0 0 0 0 rgba(46,158,91,0)}}

.screen-main{flex:1;display:grid;grid-template-columns:320px 1fr 340px;gap:20px;padding:20px 30px;min-height:0}
.sc-col{display:flex;flex-direction:column;gap:20px;min-height:0}
.sc-panel{background:rgba(255,255,255,.055);border:1px solid rgba(255,255,255,.1);border-radius:20px;padding:20px 22px;min-height:0;display:flex;flex-direction:column}
.sc-panel h3{font-size:16px;font-weight:900;color:#9fb0cc;margin-bottom:16px}
.sc-panel h3 span{color:#ffc86b}
.sc-panel--rank{flex:1}

/* 左栏：班级 / 关卡 */
.sc-field{display:flex;flex-direction:column;gap:8px;margin-bottom:14px}
.sc-field>span{font-size:13px;font-weight:800;color:#9fb0cc}
.screen-body select{width:100%;background:rgba(255,255,255,.1);border:1.5px solid rgba(255,255,255,.2);color:#eef2fb;border-radius:12px;padding:12px 14px;font-size:17px;font-weight:700}
.screen-body select option{color:#1b2233}
.sc-cls-meta{font-size:15px;color:#9fb0cc;font-weight:700;margin:-4px 0 16px}
.lv-list{display:flex;flex-direction:column;gap:8px;overflow:auto;min-height:0}
.lv-row{display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:12px;background:rgba(255,255,255,.05);cursor:pointer;border:1.5px solid transparent;font-size:16px;font-weight:800;transition:background .15s}
.lv-row:hover{background:rgba(255,255,255,.12)}
.lv-row.on{background:rgba(242,160,61,.18);border-color:rgba(242,160,61,.6)}
.lv-row .lv-no{color:#ffc86b;min-width:56px}
.lv-row .lv-nm{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lv-row .lv-live{font-size:12px;font-weight:800;color:#4ad991;white-space:nowrap}

/* 右栏：本关完成情况 */
.metric{background:rgba(255,255,255,.06);border-radius:14px;padding:16px 18px;margin-bottom:12px}
.metric:last-child{margin-bottom:0}
.metric__label{font-size:13px;color:#9fb0cc;font-weight:800;margin-bottom:4px}
.metric__value{font-size:34px;font-weight:900;color:#ffc86b;line-height:1.15}
.metric--live .metric__value{color:#4ad991}
.metric--live.on{background:rgba(74,217,145,.16);box-shadow:0 0 0 1.5px rgba(74,217,145,.5) inset}

/* 排行榜 */
.rank-list{list-style:none;overflow:auto;flex:1;min-height:0;display:flex;flex-direction:column;gap:10px;padding-right:4px}
.rank-list li{display:flex;align-items:center;gap:16px;background:rgba(255,255,255,.06);border-radius:16px;padding:14px 20px;border:1.5px solid transparent}
.rank-list li.top1{background:linear-gradient(90deg,rgba(255,200,107,.28),rgba(255,200,107,.06));border-color:rgba(255,200,107,.5)}
.rank-list li.top2{background:linear-gradient(90deg,rgba(199,210,230,.22),rgba(199,210,230,.05));border-color:rgba(199,210,230,.4)}
.rank-list li.top3{background:linear-gradient(90deg,rgba(226,160,92,.22),rgba(226,160,92,.05));border-color:rgba(226,160,92,.42)}
.rank-list li.is-active{border-color:rgba(74,217,145,.75);box-shadow:0 0 0 2px rgba(74,217,145,.28)}
.rl-rank{width:56px;font-size:26px;font-weight:900;text-align:center;color:#ffc86b;flex-shrink:0}
.rl-name{flex:1;font-size:24px;font-weight:900;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.rl-stars{font-size:20px;letter-spacing:2px;color:#ffc86b;min-width:78px;text-align:right}
.rl-pts{font-size:17px;font-weight:800;color:#9fb0cc;min-width:92px;text-align:right}
.rl-badge{font-size:12px;font-weight:800;background:linear-gradient(135deg,#ffd76a,#f2a03d);color:#5c3a04;border-radius:999px;padding:4px 10px;min-width:96px;text-align:center}
.rl-active{display:flex;align-items:center;gap:6px;font-size:12px;font-weight:800;color:#4ad991;min-width:74px;justify-content:flex-end}
.rl-active i{width:9px;height:9px;border-radius:50%;background:#4ad991;animation:pulse 1.4s infinite}
.rank-empty{color:#9fb0cc;font-size:16px;text-align:center;padding:30px 0}

.screen-err{color:#ff9aa6;font-size:13px;padding:0 30px 8px}

/* 底部老师控制条 */
.screen-bar{display:flex;align-items:center;gap:12px;padding:14px 30px;background:rgba(255,255,255,.06);border-top:1px solid rgba(255,255,255,.1)}
.screen-bar .spacer{flex:1}
.screen-bar button{background:rgba(255,255,255,.1);border:1.5px solid rgba(255,255,255,.22);color:#eef2fb;border-radius:14px;padding:14px 26px;font-weight:900;font-size:17px}
.screen-bar button:hover{background:rgba(255,255,255,.2)}
.screen-bar button.primary{background:linear-gradient(135deg,#ffb64a,#f28c1e);border-color:transparent;color:#5c3400}

@media(max-width:1200px){
  .screen-main{grid-template-columns:1fr;overflow:auto}
  .sc-panel--rank{min-height:420px}
}