:root{--blue:#0b63c7;--ink:#102033;--line:#dbe5f0;--muted:#53677c;--soft:#eef7ff;--bad:#a53520}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;background:#f5f8fb;color:var(--ink);font:16px/1.65 system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif}a{color:#074f9f;text-decoration:none}button,input,select{font:inherit}button,.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:9px 17px;border:1px solid #b7cce0;border-radius:6px;color:#174670;background:#fff;cursor:pointer;line-height:1.45}button:hover,.button:hover{border-color:var(--blue);background:#eef7ff}button:disabled{opacity:.6;cursor:wait}.primary{background:var(--blue);color:#fff;border-color:var(--blue)}.primary:hover{background:#074f9f;color:#fff}.quiet{font-size:14px}input{min-height:44px;padding:10px 12px;border:1px solid #b5c7d8;border-radius:6px;max-width:100%;width:100%;background:#fff;color:var(--ink)}input[type=checkbox]{width:20px;min-height:20px;accent-color:var(--blue)}label{display:block;font-weight:600}label>input{margin-top:6px}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #f4a51c;outline-offset:3px}.site-header{background:#fff;border-bottom:1px solid var(--line)}.bar,.shell{width:min(1120px,calc(100% - 32px));margin:auto}.bar{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:74px;flex-wrap:wrap;padding:12px 0}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:750}.brand img{width:38px;height:38px}.nav,.actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.nav{font-size:14px}.nav a{padding:6px}.shell{padding:36px 0 54px}h1{font-size:36px;line-height:1.2;margin:10px 0 18px}h2{font-size:22px;line-height:1.4;margin:0 0 14px}h3{font-size:18px;margin:20px 0 10px}p{margin:10px 0}.eyebrow{color:#0b63c7;font-size:13px;font-weight:750;letter-spacing:.08em}.muted,.hint{color:var(--muted);font-size:14px}.panel{background:#fff;border:1px solid var(--line);border-radius:8px;padding:24px;margin-top:20px}.login-layout{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:28px;align-items:start}.login-form{display:grid;gap:20px}.login-form .primary{width:100%}.login-panel{max-width:560px;margin:0}.status{min-height:28px;font-size:14px;color:#47637d}.status.error{color:var(--bad);font-weight:600}.welcome{border-left:4px solid #0b63c7}.welcome strong{font-size:22px}.entry-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:20px 0}.entry{display:block;padding:22px;border:1px solid #c7ddf0;border-radius:6px;background:#f6faff}.entry b{display:block;font-size:21px}.qr-pair{display:grid;grid-template-columns:1fr 1fr;gap:16px}.qr-box{text-align:center;padding:14px;background:#fff;border:1px solid var(--line);border-radius:6px}.qr-box img{display:block;width:min(180px,100%);height:auto;margin:10px auto}.qr-box p{font-size:14px}.head-row{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;flex-wrap:wrap}.tabs{display:flex;gap:6px;margin-top:20px;border-bottom:1px solid var(--line);padding-bottom:12px}.tabs button[aria-pressed=true]{background:var(--blue);border-color:var(--blue);color:#fff}.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:24px}.metric{background:#fff;border:1px solid var(--line);border-top:3px solid var(--blue);padding:18px 22px;border-radius:6px}.metric strong{display:block;font-size:42px;line-height:1.2;margin:10px 0;color:#0b63c7;font-variant-numeric:tabular-nums}.metric small{font-size:15px;color:var(--muted)}.check{display:flex;align-items:center;gap:8px;font-size:14px}.check input{margin:0}.question{border-bottom:1px solid var(--line);padding:18px 0}.question:last-child{border:0}.question summary{cursor:pointer;display:flex;gap:12px;align-items:flex-start;list-style:none}.q-no{font-weight:750;color:var(--blue);white-space:nowrap}.q-stem{flex:1}.q-rate{font-weight:750;white-space:nowrap}.option-row{display:grid;grid-template-columns:minmax(0,1fr) 45px;gap:10px;padding:10px 0}.option-bar{height:8px;background:#e8eff6;border-radius:3px;overflow:hidden;margin-top:6px}.option-bar i{height:100%;display:block;background:#90a9c2}.is-answer .option-bar i{background:#0b63c7}.option-row small{color:var(--muted)}.table-wrap{width:100%;overflow-x:auto}table{border-collapse:collapse;width:100%;min-width:530px;font-size:14px}th,td{text-align:left;border-bottom:1px solid var(--line);padding:12px 10px}th{background:#f5f8fb;white-space:nowrap}td button{font-size:12px;padding:6px 9px;min-height:36px}.pill{display:inline-block;padding:2px 8px;background:#eef7ff;border-radius:4px;color:#0b63c7;font-size:13px}.missing{color:#92562d;background:#fff7e9}.error-list li{margin:12px 0}.export-actions{margin:20px 0}details.panel>summary{font-weight:650;cursor:pointer}.private-tools{margin-top:24px}.private-tools>summary{font-size:17px}.password-form{display:grid;grid-template-columns:1fr 1fr auto;gap:14px;align-items:end;margin-top:20px}.password-form input{min-width:0}dialog{width:min(460px,calc(100% - 28px));max-height:90vh;overflow:auto;padding:26px;border:1px solid var(--line);border-radius:8px;color:var(--ink)}dialog::backdrop{background:#10203388}.credential{text-align:center}.credential svg{display:block;width:210px;height:210px;margin:12px auto}.credential b{letter-spacing:.04em}.footer{border-top:1px solid var(--line);padding:22px 0;font-size:13px;color:var(--muted)}.loading{padding:28px;text-align:center}.spaced{margin-top:24px}@media(max-width:720px){.login-layout{grid-template-columns:1fr}.shell{padding-top:24px}h1{font-size:30px}.bar{gap:8px}.brand{font-size:14px}.brand img{width:30px;height:30px}.panel{padding:18px}.metrics{gap:8px}.metric{padding:12px}.metric strong{font-size:31px}.metric small{font-size:12px}.password-form{grid-template-columns:1fr}.entry{padding:16px}.entry b{font-size:19px}.q-rate{font-size:14px}.q-stem{font-size:15px}.qr-pair{gap:10px}.qr-box{padding:8px}.nav{font-size:12px}.tabs button{padding:8px 15px}}@media print{.site-header,.tabs,.export-actions,.private-tools,.footer,#refresh,#logout,#projection-control,#status{display:none!important}.shell{width:100%;padding:0}.panel,.metric{break-inside:avoid}.metrics{grid-template-columns:repeat(3,1fr)}body{background:#fff}}

/* 教师课堂展示：题干题图常显；刷新只替换统计，不重建视频。 */
.question{padding:28px 0}.question-head{display:flex;gap:12px;align-items:center;justify-content:space-between}.knowledge-chip{font-size:13px;background:#eef7ff;color:#0b63c7;padding:4px 9px;border-radius:4px}.question-stem{font-size:19px;line-height:1.65;font-weight:650;margin:14px 0}.question-body{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(240px,1fr);gap:24px;align-items:center}.question-options{padding:0;list-style:none;margin:0}.question-options li{padding:9px 0;line-height:1.7}.question-options b{color:#0b63c7}.question-figure{margin:0;background:#f8fafc;border:1px solid #e4ebf2;border-radius:6px;padding:8px}.question-figure img{width:100%;height:auto;display:block}.question-analysis{margin-top:18px;background:#f8fbff;border:1px solid #d8e5f1;border-radius:6px;padding:0 18px}.question-analysis summary{display:flex;justify-content:space-between;align-items:center;padding:14px 0;gap:12px;font-size:15px;color:#315071}.question-analysis summary b{color:#0b63c7;font-size:23px;margin-left:8px}.question-analysis[open] summary{border-bottom:1px solid #d8e5f1}.choice-stat{display:grid;grid-template-columns:110px minmax(80px,1fr) 130px;gap:14px;align-items:center;padding:10px 0}.choice-stat small{font-weight:400;color:#0b63c7}.choice-stat .option-bar{margin:0;height:12px}.student-codes{display:block;grid-column:1/-1;font-size:13px;color:#64748b;overflow-wrap:anywhere}.student-codes[hidden]{display:none}.answer-explain{background:#fff;border-left:3px solid #0b63c7;padding:10px 18px;margin:18px 0;line-height:1.8}.teaching-media{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(200px,1fr);gap:20px;align-items:center;margin:20px 0}.teaching-media video{width:100%;display:block;aspect-ratio:16/9;background:#102033;border-radius:4px}.simulation-link{display:inline-block;border:1px solid #b8d4f2;border-radius:5px;padding:10px 14px;background:#fff}.overview-top{display:flex;flex-wrap:wrap;gap:12px 35px}.overview-top b{font-size:26px;color:#0b63c7;margin:0 6px}.score-distribution{display:flex;gap:20px;align-items:flex-end;max-width:700px;margin:20px auto}.score-distribution>div{flex:1;text-align:center;font-size:14px}.score-column{height:110px;display:flex;align-items:flex-end;justify-content:center;margin:8px 0;border-bottom:1px solid #cad8e7}.score-column i{display:block;background:#60a0df;width:65%;max-width:55px;min-height:0;border-radius:3px 3px 0 0}.score-distribution span{white-space:nowrap}
@media(max-width:720px){.question-body,.teaching-media{grid-template-columns:1fr;gap:14px}.question-head{align-items:flex-start;flex-direction:column;gap:4px}.question-stem{font-size:17px}.question-analysis{padding:0 10px}.question-analysis summary{font-size:13px}.choice-stat{grid-template-columns:70px minmax(30px,1fr) 95px;gap:8px;font-size:13px}.choice-stat small{display:block;font-size:11px}.overview-top{gap:0 16px}.overview-top p{margin:7px 0}.overview-top b{font-size:21px}.score-distribution{gap:8px;font-size:12px}.score-distribution>div{font-size:12px}.score-column{height:85px}}
@media print{.teaching-media{display:none}.question{break-inside:avoid}.question-analysis{background:#fff}}
