/* 教师端样式 · 由 teacher.html 内联样式拆出 */
:root{
  --bg:#f5f8fc; --card:#ffffff; --ink:#0b1220; --txt:#0f172a; --muted:#64748b;
  --line:#e2e8f0; --teal:#0e93a8; --blue:#2563eb; --amber:#f59e0b;
  --ok:#2f9e44; --bad:#ef4444; --gold:#e0a919;
  --sh:0 8px 24px rgba(15,23,42,.08); --shh:0 14px 34px rgba(15,23,42,.14);
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",sans-serif;color:var(--txt);
  background:var(--bg);
  background-image:radial-gradient(1100px 560px at 10% -12%, rgba(37,99,235,.13), transparent 60%),
                   radial-gradient(900px 520px at 96% -6%, rgba(6,182,212,.14), transparent 60%);
  min-height:100vh}
button{font-family:inherit;cursor:pointer}
.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);padding:14px 26px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.topbar .logo{font-size:20px;font-weight:700;color:var(--ink);display:flex;align-items:center;gap:9px}
.topbar .logo .badge{font-size:11px;font-weight:600;color:#fff;background:var(--blue);border-radius:999px;padding:3px 10px;letter-spacing:1px}
.topbar .spacer{flex:1}
.btn{background:#fff;border:1.5px solid var(--line);border-radius:999px;padding:8px 18px;font-size:13px;
  color:var(--muted);font-weight:600;transition:.2s}
.btn:hover{border-color:var(--teal);color:var(--teal)}
.btn.warn:hover{border-color:var(--bad);color:var(--bad)}
.wrap{max-width:1200px;margin:0 auto;padding:28px 22px 70px}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;margin-bottom:24px}
.stat{background:var(--card);border-radius:14px;box-shadow:var(--sh);padding:20px;border:1px solid rgba(226,232,240,.8)}
.stat .s-ico{font-size:22px}
.stat .s-num{font-size:30px;font-weight:800;color:var(--ink);margin-top:6px}
.stat .s-lbl{font-size:12.5px;color:var(--muted);margin-top:3px}
.panel{background:var(--card);border-radius:16px;box-shadow:var(--sh);padding:24px;margin-bottom:22px;border:1px solid rgba(226,232,240,.7)}
.panel h3{font-size:16.5px;color:var(--ink);margin-bottom:16px;display:flex;align-items:center;gap:8px}
.panel h3 .cnt{font-size:12px;color:var(--teal);background:#e6f6f8;border-radius:999px;padding:2px 11px;font-weight:700}
.tbl-wrap{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:13.5px;min-width:760px}
th{background:#f0f5fa;color:#475569;font-weight:600;text-align:left;padding:10px 12px;border-bottom:1.5px solid var(--line);white-space:nowrap}
td{padding:10px 12px;border-bottom:1px solid #eef2f7;color:var(--txt);white-space:nowrap}
tr:hover td{background:#f8fbfe}
.ok-ico{color:var(--ok);font-weight:700}
.no-ico{color:#cbd5e1}
.star-cell{color:#b45309;font-weight:700}
.tag{display:inline-block;border-radius:999px;padding:2px 10px;font-size:11.5px;font-weight:600}
.tag.ok{background:#e8f7ee;color:var(--ok)}
.tag.no{background:#f1f5f9;color:var(--muted)}
.tag.mid{background:#fdf3e0;color:#b45309}
.empty{text-align:center;color:var(--muted);padding:34px 10px;font-size:14px;line-height:2}
.rep-card{border:1.5px solid var(--line);border-radius:12px;padding:16px 18px;margin-bottom:12px;background:#fbfdff}
.rep-head{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px}
.rep-head b{font-size:15px;color:var(--ink)}
.rep-head .rp-tag{font-size:11.5px;background:#e6f6f8;color:var(--teal);border-radius:999px;padding:2px 10px;font-weight:600}
.rep-head .rp-time{font-size:12px;color:var(--muted);margin-left:auto}
.rep-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:8px 18px;font-size:13px}
.rep-grid .rg-item b{color:var(--muted);font-weight:600;font-size:12px;display:block}
.rk-row{display:flex;align-items:center;gap:13px;padding:11px 14px;border-bottom:1px solid #eef2f7}
.rk-row:last-child{border-bottom:none}
.rk-no{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:13.5px;flex:none}
.rk-no.n1{background:#fdf3d7;color:#b45309;border:1.5px solid #f0d9a0}
.rk-no.n2{background:#eef2f7;color:#64748b;border:1.5px solid #dbe2ea}
.rk-no.n3{background:#f7e9df;color:#b45309;border:1.5px solid #ecd5c0}
.rk-no.nn{background:#f5f8fc;color:#94a3b8}
.rk-name{flex:1;font-size:14px;color:var(--ink)}
.rk-cls{font-size:12px;color:var(--muted)}
.rk-stars{color:#b45309;font-weight:800;font-size:15px}
.qz-detail{font-size:12.5px;color:var(--muted)}
.qz-detail b.wrong{color:var(--bad)}
.qz-detail b.right{color:var(--ok)}
.legend{font-size:12px;color:var(--muted);margin-top:10px}
.refresh-note{font-size:12px;color:var(--muted);text-align:right;margin-top:-8px;margin-bottom:14px}
/* ===== 做题情况分析 ===== */
.qa-sec{margin-bottom:14px}
.qa-sec h4{font-size:13.5px;color:var(--ink);margin:4px 0 8px;display:flex;align-items:center;gap:8px}
.qa-sec h4 .cnt{font-weight:600}
.qa-row{display:flex;align-items:center;gap:12px;padding:11px 12px;border-radius:10px;cursor:pointer;transition:.15s;border:1px solid transparent}
.qa-row:hover{background:#f2f8fd;border-color:#d8e9f4}
.qa-no{width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:14px;flex:none;color:#fff}
.qa-txt{flex:1;min-width:0;font-size:13.5px;color:var(--ink);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.qa-meta{font-size:12px;color:var(--muted);flex:none;white-space:nowrap}
.qa-bar{width:140px;height:9px;background:#eef2f7;border-radius:6px;overflow:hidden;flex:none}
.qa-bar i{display:block;height:100%;border-radius:6px;transition:width .6s}
.qa-rate{width:56px;text-align:right;font-weight:800;font-size:14px;flex:none}
.qa-wrong{font-size:11.5px;color:var(--bad);background:#fdecec;border-radius:999px;padding:2px 10px;flex:none;white-space:nowrap}
.qa-none{font-size:12.5px;color:var(--muted);padding:8px 12px}
/* 讲解弹窗 */
.qmodal{position:fixed;inset:0;background:rgba(11,18,32,.6);z-index:100;display:none;align-items:center;justify-content:center;padding:22px;backdrop-filter:blur(3px)}
.qmodal.show{display:flex}
.qm-card{background:#fff;border-radius:18px;max-width:700px;width:100%;max-height:90vh;overflow-y:auto;box-shadow:0 24px 60px rgba(15,23,42,.4);animation:qmpop .25s}
@keyframes qmpop{from{transform:scale(.94);opacity:0}to{transform:scale(1);opacity:1}}
.qm-head{display:flex;align-items:center;gap:10px;padding:14px 20px;background:linear-gradient(135deg,#06b6d4,#2563eb);color:#fff;position:sticky;top:0;z-index:2}
.qm-head b{font-size:15.5px;letter-spacing:.5px}
.qm-rate{background:rgba(255,255,255,.22);border-radius:20px;padding:3px 13px;font-size:13px;font-weight:700}
.qm-close{margin-left:auto;width:30px;height:30px;border:none;border-radius:9px;background:rgba(255,255,255,.2);color:#fff;font-size:15px;cursor:pointer}
.qm-close:hover{background:rgba(255,255,255,.35)}
.qm-body{padding:20px 24px 26px}
.qm-q{font-size:17px;font-weight:700;color:var(--ink);line-height:1.75;margin-bottom:16px}
.qm-opt{display:flex;align-items:center;gap:11px;border:1.5px solid var(--line);border-radius:11px;padding:11px 14px;margin-bottom:9px;font-size:14.5px;color:var(--txt);position:relative}
.qm-opt.right{border-color:var(--ok);background:#e8f7ee}
.qm-opt .qm-letter{width:27px;height:27px;border-radius:8px;background:#eef2f7;color:var(--muted);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:13px;flex:none}
.qm-opt.right .qm-letter{background:var(--ok);color:#fff}
.qm-opt .qm-mark{margin-left:auto;font-weight:800;color:var(--ok);flex:none}
.qm-opt .qm-n{margin-left:auto;font-size:12px;color:var(--muted);flex:none;white-space:nowrap}
.qm-stu{display:flex;flex-wrap:wrap;gap:7px;margin:14px 0;align-items:center}
.qm-stu .lbl{font-size:12.5px;color:var(--muted);font-weight:700}
.qm-stu .stu{font-size:12.5px;background:#fdecec;color:var(--bad);border-radius:999px;padding:3px 12px;font-weight:600}
.qm-exp{background:linear-gradient(135deg,#f0f9ff,#eef7f4);border-left:4px solid #06b6d4;border-radius:0 12px 12px 0;padding:15px 18px;margin-top:16px}
.qm-exp .qm-exp-t{font-size:13px;font-weight:800;color:#2563eb;margin-bottom:7px;display:flex;align-items:center;gap:7px}
.qm-exp .qm-exp-p{font-size:15px;line-height:2;color:var(--txt)}
.qm-tip{font-size:12px;color:var(--muted);margin-top:12px;text-align:center}
/* ===== 实验诊断 ===== */
.lab-sum{display:flex;flex-direction:column;gap:10px;margin-bottom:18px}
.lab-sum .ls-row{display:flex;align-items:flex-start;gap:10px;font-size:13px;line-height:1.7}
.lab-sum .ls-k{flex:none;width:158px;font-weight:700;color:var(--ink);display:flex;align-items:center;gap:6px}
.lab-sum .ls-k.bad{color:var(--bad)}
.lab-sum .ls-k.warn{color:#b45309}
.lab-sum .ls-k.ok{color:var(--ok)}
.lab-sum .ls-g{display:flex;flex-wrap:wrap;gap:6px}
.lab-sum .ls-g .g-chip{background:#fdecec;color:var(--bad);border-radius:999px;padding:2px 12px;font-weight:600;font-size:12.5px}
.lab-sum .ls-g .g-chip.warn{background:#fdf3e0;color:#b45309}
.lab-sum .ls-g .g-chip.ok{background:#e8f7ee;color:var(--ok)}
.lab-sum .ls-g .g-chip.info{background:#eef2f7;color:var(--muted)}
.lab-sum .ls-all{font-size:12.5px;color:var(--muted)}
.rep-status{font-size:11.5px;font-weight:700;border-radius:999px;padding:3px 12px;flex:none}
.rep-status.ok{background:#e8f7ee;color:var(--ok)}
.rep-status.warn{background:#fdf3e0;color:#b45309}
.rep-status.bad{background:#fdecec;color:var(--bad)}
.issue-list{margin-top:12px;border-top:1px dashed var(--line);padding-top:12px;display:flex;flex-direction:column;gap:8px}
.issue-item{display:flex;gap:10px;align-items:flex-start;border-radius:10px;padding:10px 13px;font-size:13px;line-height:1.65}
.issue-item.bad{background:#fef2f2;border:1px solid #fecaca}
.issue-item.warn{background:#fffbeb;border:1px solid #fde68a}
.issue-item.info{background:#f8fafc;border:1px solid var(--line)}
.issue-item .i-ico{flex:none;font-size:15px}
.issue-item .i-body b{color:var(--ink)}
.issue-item .i-tip{display:block;font-size:12px;color:var(--muted);margin-top:3px}
.issue-ok{margin-top:12px;border-top:1px dashed var(--line);padding-top:12px;font-size:12.5px;color:var(--ok);font-weight:600;display:flex;align-items:center;gap:7px}

/* ===== 教师登录门禁 ===== */
.gate{position:fixed;inset:0;z-index:200;display:none;align-items:center;justify-content:center;
  background:var(--bg);
  background-image:radial-gradient(900px 480px at 20% -10%, rgba(37,99,235,.16), transparent 60%),
                   radial-gradient(760px 420px at 90% 0%, rgba(6,182,212,.16), transparent 60%);
  padding:24px}
.gate.show{display:flex}
.gate-card{width:100%;max-width:420px;background:#fff;border:1px solid var(--line);border-radius:20px;
  box-shadow:var(--shh);padding:32px 30px}
.gate-head{font-size:19px;font-weight:700;color:var(--ink);display:flex;align-items:center;gap:9px;margin-bottom:10px}
.gate-badge{font-size:11px;font-weight:600;color:#fff;background:var(--blue);border-radius:999px;padding:3px 10px;letter-spacing:1px}
.gate-tip{font-size:13px;color:var(--muted);line-height:1.7;margin-bottom:20px}
.gate-tip code{background:#f1f5f9;border:1px solid var(--line);border-radius:5px;padding:1px 6px;font-size:12px}
.gate-row{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.gate-row span{width:38px;font-size:13px;color:var(--muted)}
.gate-row input{flex:1;border:1.5px solid var(--line);border-radius:10px;padding:11px 13px;font-size:14px;
  font-family:inherit;color:var(--txt);outline:none;background:#fff;transition:border-color .15s}
.gate-row input:focus{border-color:var(--blue)}
.gate-err{min-height:20px;font-size:12.5px;color:var(--bad);margin:-4px 0 8px}
.gate-btn{width:100%;border:0;border-radius:12px;padding:13px;font-size:15px;font-weight:600;color:#fff;
  background:linear-gradient(135deg,var(--blue),var(--teal));cursor:pointer}
.gate-btn:disabled{opacity:.65;cursor:default}
.gate-foot{font-size:12px;color:var(--muted);text-align:center;margin-top:16px;line-height:1.6}

/* ===== 个人码列与单人操作 ===== */
.code-cell{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;font-weight:600;
  color:var(--blue);letter-spacing:1px;text-align:center}
.act-cell{white-space:nowrap;text-align:right}
.act-cell .mini{border:1px solid var(--line);background:#fff;border-radius:8px;padding:4px 9px;
  font-size:12px;color:var(--muted);cursor:pointer;margin-left:6px}
.act-cell .mini:hover{border-color:var(--blue);color:var(--blue)}

/* ===== 二维码实验收集 ===== */
.qr-note{padding:9px 14px;border-radius:9px;font-size:13px;margin-bottom:12px;line-height:1.6}
.qr-note.warn{background:#fffbeb;border:1px solid #fde68a;color:#92400e}
.qr-note.ok{background:#f0fdf4;border:1px solid #bbf7d0;color:#166534}
.qr-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px}
.qr-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px;display:flex;gap:12px;align-items:center}
.qr-item img{width:92px;height:92px;border:1px solid var(--line);border-radius:8px;flex:none}
.qr-info{display:flex;flex-direction:column;gap:4px;min-width:0}
.qr-info b{font-size:13.5px;color:var(--ink)}
.qr-info span{font-size:12.5px;color:var(--muted);line-height:1.5;word-break:break-all;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.qr-info i{font-size:11.5px;color:#94a3b8;font-style:normal}