:root{--navy:#132e56;--primary:#224a7b;--secondary:#526d91;--ink:#172b49;--muted:#5e6e84;--paper:#f5f7fb;--white:#fff;--line:#dce3ee;--soft:#eaf0f8;--accent:#911e2b;--red:#911e2b;--red-soft:#fcf0f2;--shadow:0 8px 28px #132e5610;font-family:Inter,-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.48}button,a,input,select,textarea{outline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--accent)}a{color:var(--primary)}h1,h2,h3,p{margin:0}h1{font-size:32px;letter-spacing:-.7px;line-height:1.35}h2{font-size:21px;line-height:1.5}h3{font-size:16px;line-height:1.6}p{line-height:1.8}small{line-height:1.6}button{border:0}input,select,textarea{width:100%;border:1px solid var(--line);background:var(--white);border-radius:10px;padding:12px 14px;color:var(--ink)}input[type=checkbox]{width:17px;height:17px;accent-color:var(--primary)}textarea{resize:vertical;min-height:160px}label{display:block;font-size:13px;font-weight:650;line-height:1.7}label>input,label>select,label>textarea{margin-top:7px}.skip-link{position:fixed;top:-100px;left:16px;padding:12px;background:var(--navy);color:white;z-index:100}.skip-link:focus{top:12px}.boot{display:grid;place-content:center;justify-items:center;min-height:100vh;gap:20px}.brand-mark{height:44px;width:44px;display:grid;place-items:center;background:var(--navy);color:#ffffff;border-radius:13px;font:italic 700 33px Georgia,serif;padding-bottom:5px;flex:none}.brand{display:flex;gap:12px;align-items:center}.brand-name{font-size:16px;font-weight:750;letter-spacing:.1px}.brand-caption{display:block;color:var(--muted);font-size:10px;letter-spacing:2px;margin-top:4px}.app-header{height:82px;max-width:1320px;margin:0 auto;padding:0 42px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);gap:30px}.top-nav{display:flex;align-items:center;gap:6px}.nav-button{padding:10px 14px;background:none;color:var(--muted);border-radius:9px;white-space:nowrap;font-size:13px;font-weight:600}.nav-button.active{background:var(--soft);color:var(--navy)}.account-button{margin-left:14px;display:flex;gap:10px;align-items:center;padding:8px 11px;background:none;border-left:1px solid var(--line);font-size:13px;color:var(--ink)}.avatar{background:var(--soft);border-radius:50%;width:30px;height:30px;display:grid;place-content:center;font-weight:700}.page{max-width:1236px;margin:0 auto;padding:40px 42px 60px}.page-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:30px}.eyebrow{font-size:11px;font-weight:750;letter-spacing:2px;color:var(--secondary);text-transform:uppercase;display:block;margin-bottom:10px}.subtitle{color:var(--muted);font-size:14px;margin-top:12px}.badge,.tag{display:inline-flex;align-items:center;border-radius:6px;background:var(--soft);color:var(--primary);font-size:11px;padding:5px 9px;line-height:1.4;white-space:nowrap}.badge{border:1px solid var(--line);background:none;gap:8px;font-size:12px}.badge-dot{width:6px;height:6px;border-radius:50%;background:var(--secondary)}.panel{background:var(--white);border:1px solid var(--line);border-radius:17px;box-shadow:var(--shadow);padding:26px}.panel-header{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:22px}.panel-header .eyebrow{margin-bottom:5px}.section-label{font-size:12px;font-weight:700;color:var(--muted);margin:24px 0 12px;display:flex;gap:9px;align-items:center}.step{height:20px;width:20px;display:grid;place-content:center;border-radius:50%;background:var(--soft);color:var(--primary);font-size:10px}.dashboard-grid{display:grid;grid-template-columns:minmax(0,1.85fr) minmax(255px,1fr);gap:24px}.stack{display:grid;gap:20px;align-content:start}.mode-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.choice-card{background:#f9fbfe;border:1px solid var(--line);border-radius:11px;padding:17px 12px;text-align:left;position:relative;color:var(--ink);transition:.15s}.choice-card.selected{border:1.5px solid var(--primary);background:#edf3fb;padding:16.5px 11.5px}.choice-card strong{display:block;font-size:14px;margin-bottom:7px}.choice-card small{display:block;font-size:11px;color:var(--muted);line-height:1.6}.choice-card .choice-icon{font-size:17px;margin-bottom:9px;display:block;color:var(--secondary)}.choice-check{position:absolute;right:9px;top:9px;background:var(--primary);color:white;width:14px;height:14px;border-radius:50%;font-size:9px;display:grid;place-content:center}.module-grid{display:flex;gap:8px;flex-wrap:wrap}.module-choice{padding:11px 15px;border:1px solid var(--line);background:white;border-radius:9px;display:flex;gap:9px;align-items:center;font-size:13px;color:var(--muted)}.module-choice.selected{border-color:var(--primary);color:var(--primary);background:var(--soft)}.module-choice.locked{opacity:1}.field-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:16px}.field-help{font-size:11px;line-height:1.7;color:var(--muted);margin-top:8px}.check-row{display:flex;gap:10px;align-items:center;font-weight:500;font-size:13px;margin-top:20px}.start-row{display:flex;justify-content:space-between;align-items:center;gap:20px;padding-top:23px;border-top:1px solid var(--line);margin-top:25px}.session-summary{font-size:13px;color:var(--muted);line-height:1.8}.session-summary strong{font-size:18px;color:var(--ink);font-weight:700}.btn{border-radius:10px;padding:12px 19px;background:var(--navy);color:white;font-weight:650;font-size:13px;display:inline-flex;justify-content:center;align-items:center;gap:8px;min-height:43px;transition:background .15s}.btn:hover:not(:disabled){background:var(--primary)}.btn.secondary{background:white;border:1px solid var(--line);color:var(--primary)}.btn.secondary:hover:not(:disabled){background:var(--soft)}.btn.light{background:var(--soft);color:var(--primary)}.btn.danger{background:var(--red);color:white}.btn.small{padding:8px 12px;min-height:34px;font-size:12px}.btn.text{background:none;padding:8px 0;min-height:30px;color:var(--primary)}.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px 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20px;text-align:center;color:var(--muted);font-size:13px}.inline-loading{font-size:12px;color:var(--muted)}.login-layout{min-height:100vh;display:grid;grid-template-columns:1.05fr 1fr}.login-story{background:var(--navy);color:#ffffff;padding:60px 9%;display:flex;flex-direction:column;justify-content:space-between;position:relative;overflow:hidden}.login-story .brand-mark{background:#ffffff;color:var(--navy)}.login-story .brand-caption{color:#b7cae5}.login-story:after{content:"";position:absolute;width:430px;height:430px;border:1px solid #ffffff12;border-radius:50%;right:-220px;top:30%;box-shadow:0 0 0 65px #ffffff04,0 0 0 130px #ffffff03;pointer-events:none}.login-story h1{font-size:clamp(35px,4.4vw,59px);line-height:1.35;font-weight:500;letter-spacing:-1.5px;margin-bottom:25px;position:relative;z-index:1}.login-story h1 em{font:italic 500 1.12em Georgia,serif;color:#f2b9c0}.login-story p{max-width:350px;color:#c5d6ee;font-size:13px}.login-story .eyebrow{color:#eab5bc}.login-meta{font-size:10px;letter-spacing:1px;color:#a8bedc}.login-form-area{display:grid;place-content:center;padding:45px}.login-box{width:min(360px,calc(100vw - 70px))}.login-box h2{font-size:27px;margin-bottom:10px}.login-box>p{color:var(--muted);font-size:13px;margin-bottom:29px}.login-box label{margin-top:17px}.login-box .btn{width:100%;margin-top:26px}.login-note{font-size:11px;color:var(--muted);margin-top:23px;line-height:1.9;padding-top:20px;border-top:1px solid var(--line)}.exam-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:23px;gap:20px}.exam-heading h1{font-size:25px}.exam-meta{margin-top:9px;display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:12px;color:var(--muted)}.timer-box{text-align:right;min-width:145px}.timer-label{font-size:10px;color:var(--muted);letter-spacing:1px}.timer-value{font-variant-numeric:tabular-nums;font-size:30px;font-weight:650;letter-spacing:1px;color:var(--primary);margin-top:5px}.timer-value.urgent{color:var(--red)}.exam-layout{display:grid;grid-template-columns:minmax(0,1fr) 245px;gap:22px;align-items:start}.question-panel{padding:24px 27px}.question-top{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;border-bottom:1px solid var(--line);padding-bottom:18px}.question-count{font-size:12px;color:var(--muted)}.question-number{font-size:20px;font-weight:650;margin-bottom:8px}.question-image{display:block;width:100%;height:auto;margin:20px auto;background:white}.question-image-box{min-height:130px;overflow:hidden}.source-line{font-size:10px;color:var(--muted);margin:11px 0 15px;line-height:1.7}.option-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.answer-option{border:1px solid var(--line);padding:13px;background:white;border-radius:9px;color:var(--ink);font-weight:650;font-size:15px;min-height:49px}.answer-option:hover:not(:disabled){background:var(--soft)}.answer-option.selected{background:var(--navy);border-color:var(--navy);color:white}.answer-option:disabled{opacity:.65}.answer-option.selected:disabled{opacity:1}.answer-footer{display:flex;justify-content:space-between;gap:15px;font-size:11px;color:var(--muted);margin-top:13px;align-items:center}.answer-footer .btn{font-size:11px}.question-navigation{display:flex;justify-content:space-between;gap:10px;padding-top:20px;margin-top:18px;border-top:1px solid var(--line)}.answer-card{padding:20px;position:sticky;top:20px}.module-status-list{display:grid;gap:8px;margin:16px 0}.module-status{display:flex;justify-content:space-between;gap:8px;font-size:11px;background:#f5f8fc;padding:9px 10px;border-radius:7px;color:var(--muted)}.module-status.current{background:var(--soft);color:var(--primary);font-weight:650}.question-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;margin:18px 0}.question-cell{border:1px solid var(--line);background:white;color:var(--muted);border-radius:7px;min-height:31px;font-size:11px;position:relative}.question-cell.answered{background:var(--soft);color:var(--primary);border-color:#c6d7ed}.question-cell.current{border:2px solid var(--navy);color:var(--navy);font-weight:750}.question-cell.flagged:after{content:"";width:5px;height:5px;background:var(--accent);border-radius:50%;position:absolute;right:3px;top:3px}.card-legend{font-size:10px;line-height:1.8;color:var(--muted)}.exam-action{border-top:1px solid var(--line);padding-top:17px;margin-top:17px;display:grid;gap:9px}.exam-action p{font-size:10px;color:var(--muted);line-height:1.8}.flag-btn{background:none;padding:7px 9px;font-size:12px;color:var(--muted);border-radius:7px;border:1px solid var(--line)}.flag-btn.on{background:#fcf0f2;color:#911e2b;border-color:#edc6cc}.results-hero{background:var(--navy);color:white;border-radius:18px;padding:30px 34px;display:grid;grid-template-columns:1fr 1.5fr;gap:35px;align-items:center;margin-bottom:24px}.results-hero .eyebrow{color:#bdd0e9}.score{font-size:60px;letter-spacing:-3px;font-weight:500;line-height:1.2}.score small{font-size:22px;color:#bfd1e9;letter-spacing:0;margin-left:7px}.score-caption{font-size:12px;color:#d0def0;margin-top:7px}.module-scores{display:grid;gap:14px}.module-score-row{display:flex;justify-content:space-between;gap:20px;font-size:13px}.module-score-row strong{font-weight:650}.module-scores .progress-track{background:#ffffff15;margin-top:7px}.module-scores .progress-track span{background:#c1d4ed}.toolbar{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:20px}.button-group{display:flex;gap:6px;flex-wrap:wrap}.filter-button{padding:8px 13px;border-radius:8px;background:none;color:var(--muted);font-size:12px}.filter-button.active{background:var(--soft);color:var(--primary);font-weight:650}.review-list{display:grid;gap:13px}.review-card{background:white;border:1px solid var(--line);border-radius:12px;padding:19px 21px}.review-card-header{display:flex;justify-content:space-between;align-items:flex-start;gap:15px}.review-title{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-weight:650;font-size:13px}.review-card p{font-size:12px;color:var(--muted);margin-top:10px}.review-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}.review-status{font-size:11px;color:var(--red);background:var(--red-soft);border-radius:5px;padding:5px 9px;white-space:nowrap}.review-status.correct{background:var(--soft);color:var(--primary)}.review-answer{display:flex;gap:24px;flex-wrap:wrap;font-size:12px;margin-top:13px}.review-answer strong{margin-left:8px;font-size:14px}.review-answer .good{color:var(--primary)}.review-answer .bad{color:var(--red)}details>summary{cursor:pointer;color:var(--primary);font-size:12px;margin-top:13px;line-height:1.8}details .question-image{max-width:850px}.filter-row{display:grid;grid-template-columns:1fr 1.5fr 1fr auto;gap:13px;align-items:end;margin-bottom:22px}.filter-row .check-row{margin:0 0 11px;white-space:nowrap}.wrong-start{display:flex;gap:12px;align-items:center;padding:17px 21px;background:var(--soft);border-radius:11px;margin-bottom:22px}.wrong-start p{flex:1;font-size:12px;color:var(--muted)}.wrong-start input{width:85px;padding:9px 11px}.table-wrap{overflow:auto}.data-table{width:100%;border-collapse:collapse;font-size:12px}.data-table th{text-align:left;font-size:11px;color:var(--muted);font-weight:600;white-space:nowrap}.data-table th,.data-table td{padding:15px 13px;border-bottom:1px solid var(--line);line-height:1.7}.data-table td:first-child,.data-table th:first-child{padding-left:0}.data-table td:last-child,.data-table th:last-child{padding-right:0}.data-table tr:last-child td{border-bottom:0}.data-table .muted{font-size:10px}.muted{color:var(--muted)}.account-grid{display:grid;grid-template-columns:1fr 1.5fr;gap:24px}.account-details{display:grid;gap:15px;margin-top:23px;font-size:13px}.account-details div{display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);padding-bottom:14px}.password-form{max-width:410px}.password-form label{margin:14px 0}.password-form .btn{margin-top:10px}.admin-grid{display:grid;grid-template-columns:1fr 1.4fr;gap:23px;align-items:start}.admin-copy{margin:20px 0 13px;font-size:12px;color:var(--muted)}.admin-copy strong{color:var(--ink)}.credential-panel{margin-top:22px;background:#f1f5fb;border:1px solid #d5e0ef;border-radius:12px;padding:19px}.credential-panel h3{font-size:14px}.credential-panel p{font-size:11px;color:var(--muted);margin:9px 0 14px}.credential-panel .button-group{margin-bottom:11px}.admin-errors{font-size:12px;color:var(--red);line-height:1.9;white-space:pre-wrap;margin-top:15px}.banner{background:#eef3fa;border:1px solid #d9e3f0;padding:14px 18px;border-radius:11px;font-size:12px;color:var(--muted);line-height:1.8;margin-bottom:23px}.pill{border-radius:20px;font-size:10px;padding:4px 9px;background:var(--soft);color:var(--primary)}.pill.inactive{background:var(--red-soft);color:var(--red)}.no-script{text-align:center;margin:20px}
@media(min-width:1450px){.page{padding-top:50px}.login-story{padding:70px 12%}}
@media(max-width:1000px){.app-header{padding:0 24px;gap:12px}.page{padding:32px 24px 45px}.app-footer{margin:0 24px}.nav-button{padding:9px 10px}.brand-caption{letter-spacing:1px}.dashboard-grid{grid-template-columns:minmax(0,1.65fr) minmax(235px,1fr);gap:18px}.panel{padding:21px}.mode-grid{gap:7px}.choice-card{padding:14px 10px}.choice-card.selected{padding:13.5px 9.5px}.mode-grid strong{font-size:13px}.exam-layout{grid-template-columns:minmax(0,1fr) 215px}.question-panel{padding:21px}.account-button{margin-left:4px}.admin-grid{grid-template-columns:1fr}.login-story{padding:45px 9%}.filter-row{grid-template-columns:1fr 1fr 1fr}.filter-row .check-row{grid-column:1/-1;margin:0}}
@media(max-width:760px){.app-header{height:auto;min-height:73px;flex-wrap:wrap;padding:17px 19px 10px;gap:12px}.brand{gap:9px}.brand-mark{height:37px;width:37px;font-size:29px;border-radius:11px}.brand-name{font-size:14px}.brand-caption{font-size:9px}.top-nav{width:100%;overflow:auto;order:2;padding-bottom:5px;gap:2px}.account-button{margin-left:auto;padding:6px 8px;border-left:0}.account-button .account-name{display:none}.nav-button{font-size:12px;padding:9px 12px}.page{padding:26px 18px 35px}.page-heading{margin-bottom:23px;align-items:flex-start}h1{font-size:26px}.subtitle{font-size:12px;margin-top:10px}.page-heading .badge{display:none}.dashboard-grid{grid-template-columns:1fr}.dashboard-grid>.stack{grid-template-columns:1fr 1fr}.dashboard-grid>.stack .continuation{grid-column:1/-1}.stats-grid{gap:18px 12px}.stat-value{font-size:24px}.note-card{padding:18px}.note-card p{font-size:11px}.app-footer{margin:0 18px;flex-direction:column;gap:5px}.login-layout{grid-template-columns:1fr}.login-story{min-height:250px;padding:27px 28px}.login-story h1{font-size:34px;margin:25px 0 13px}.login-story h1 br{display:none}.login-story p{font-size:11px}.login-meta{display:none}.login-form-area{padding:30px 28px 45px}.login-box{width:min(420px,calc(100vw - 56px))}.login-box h2{font-size:24px}.login-box>p{margin-bottom:20px}.exam-layout{grid-template-columns:1fr}.answer-card{position:static;padding:20px}.question-grid{grid-template-columns:repeat(9,1fr)}.module-status-list{grid-template-columns:repeat(3,1fr)}.module-status{flex-direction:column;gap:4px}.exam-heading h1{font-size:21px}.timer-box{min-width:108px}.timer-value{font-size:26px}.exam-meta{font-size:10px;gap:6px}.exam-meta .tag{font-size:10px}.results-hero{grid-template-columns:1fr;gap:25px;padding:25px}.score{font-size:51px}.module-scores{gap:12px}.toolbar{flex-wrap:wrap;gap:13px}.filter-row{grid-template-columns:1fr 1fr}.filter-row>label:nth-child(3){grid-column:1/-1}.filter-row .check-row{grid-column:1/-1}.wrong-start{flex-wrap:wrap;gap:10px}.wrong-start p{flex:1 0 100%;font-size:11px}.wrong-start .btn{flex:1}.account-grid{grid-template-columns:1fr}.review-card{padding:17px}.review-card-header{gap:12px}.data-table th,.data-table td{padding:12px 10px}.question-top{gap:10px}.question-number{font-size:18px}.flag-btn{font-size:11px;white-space:nowrap}.question-image{margin:17px auto}.banner{font-size:11px}}
@media(max-width:420px){.panel{padding:18px}.dashboard-grid>.stack{grid-template-columns:1fr}.mode-grid{gap:6px}.choice-card strong{font-size:12px}.choice-card small{font-size:10px}.choice-icon{display:none!important}.choice-card{padding:18px 8px 11px}.choice-card.selected{padding:17.5px 7.5px 10.5px}.module-choice{padding:9px 12px;font-size:12px}.field-grid{grid-template-columns:1fr}.start-row{gap:12px}.start-row .btn{padding:12px 14px}.question-panel{padding:17px}.question-grid{grid-template-columns:repeat(7,1fr)}.option-grid{gap:8px}.answer-option{padding:11px}.module-status-list{grid-template-columns:1fr}.module-status{flex-direction:row}.review-answer{gap:15px}.review-title{font-size:12px}.tag{font-size:10px}}
.pale{color:#c6d7ee}.mt7{margin-top:7px}.mt9{margin-top:9px}.mt15{margin-top:15px}.mt18{margin-top:18px}.mt23{margin-top:23px}.text11{font-size:11px}.text12{font-size:12px}.module-percentage{color:#bfd1e9;font-size:11px;margin-left:9px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}

/* 科桥红蓝：取自主站校徽的代表色，保持页面层次与状态对比。 */
:root{--brand-red:#911e2b;--brand-blue:#132e56}
.brand-mark{background:var(--brand-red);color:var(--white)}
.app-header{border-top:3px solid var(--brand-red)}
.eyebrow{color:var(--brand-red)}
.btn:not(.secondary):not(.light):not(.text){background:var(--brand-red)}
.btn:not(.secondary):not(.light):not(.text):hover:not(:disabled){background:#761923}
.btn.secondary,.btn.light,.btn.text{color:var(--brand-blue)}
.login-story{background:var(--brand-blue);border-top:6px solid var(--brand-red)}
.login-story .brand-mark{background:var(--brand-red);color:var(--white)}
.login-story h1 em{color:#ffd2d7}
.login-story .eyebrow{color:#f1b9c0}
.results-hero{background:var(--brand-blue);border-top:4px solid var(--brand-red)}
.continuation{background:var(--brand-blue);border-top:3px solid var(--brand-red)}
.choice-check,.progress-track span{background:var(--brand-blue)}
.question-cell.flagged:after{background:var(--brand-red)}

/* 暂停题用中性状态，避免显示成答错。 */
.review-status.excluded{background:var(--soft);color:var(--muted)}
.score.no-score{font-size:24px;line-height:1.5}

/* 交卷后与错题库中的已复核解析，沿用科桥红蓝。 */
.answer-explanation{border-top:1px solid var(--line);margin-top:16px;padding-top:2px}
.answer-explanation>summary{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:8px 0;min-height:36px;font-size:13px;font-weight:650;list-style:none}
.answer-explanation>summary::-webkit-details-marker{display:none}
.answer-explanation>summary:before{content:"＋";font-size:17px;font-weight:500;color:var(--brand-blue)}
.answer-explanation[open]>summary:before{content:"−"}
.official-solution-body{display:grid;gap:16px;margin:12px 0 6px;min-width:0}
.official-solution-page{margin:0;min-width:0}
.official-solution-page>button{margin-bottom:10px}
.official-solution-page>img{display:block;width:auto;max-width:100%;height:auto;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:6px}
.official-solution-source{justify-self:start;font-size:13px;font-weight:600;line-height:1.6}
.paper-source-row{margin-bottom:14px}
.check-row[hidden]{display:none}
.answer-explanation>summary:focus-visible{outline:3px solid var(--brand-red);outline-offset:3px;border-radius:5px}
.explanation-badge{font-size:10px;font-weight:500;line-height:1.7;color:var(--muted);background:var(--soft);border-radius:5px;padding:3px 7px}
.explanation-body{display:grid;gap:18px;margin:12px 0 5px;font-size:13px;line-height:1.9;color:var(--ink);overflow-wrap:anywhere}
.explanation-body h4{font-size:12px;font-weight:700;color:var(--brand-blue);margin:0 0 7px}
.explanation-body ul,.explanation-body ol{margin:0;padding-left:23px}
.explanation-body li{padding-left:4px;margin:5px 0;white-space:pre-wrap}
.explanation-steps li{margin:8px 0;padding-left:5px}
.explanation-steps li::marker{color:var(--brand-blue);font-weight:650}
.explanation-pitfalls{border-left:3px solid var(--brand-red);padding:11px 14px;background:#fcf5f6;border-radius:0 7px 7px 0}
.review-card .explanation-pitfalls p{margin:0;font-size:13px;line-height:1.9;color:var(--ink);white-space:pre-wrap}
.review-card .explanation-pending{margin:15px 0 2px;padding-top:12px;border-top:1px solid var(--line);font-size:11px;color:var(--muted)}
.explanation-body .katex{font:inherit;line-height:inherit}
.explanation-body math{font-size:1.07em;max-width:100%}
.explanation-body math[display="block"]{display:block;overflow-x:auto;margin:10px 0;padding:5px 0;text-align:left}
.explanation-body .katex-display{margin:10px 0;overflow-x:auto;overflow-y:hidden;max-width:100%;padding:4px 0}
.explanation-body .katex-error{white-space:pre-wrap;color:var(--brand-blue)!important}
@media(max-width:760px){.explanation-body,.review-card .explanation-pitfalls p{font-size:12px}.explanation-badge{font-size:9px}.answer-explanation>summary{gap:7px}.explanation-pitfalls{padding:10px 12px}}

/* 做题优先：整图预览不裁切，长题可切换宽度阅读或打开大图。 */
.exam-header{height:47px;padding:0 22px;gap:12px}
.exam-header .brand-caption{display:none}
.exam-header .brand-mark{width:29px;height:29px;border-radius:8px;font-size:24px}
.exam-header .brand-name{font-size:13px}
.exam-menu{position:relative;margin-left:auto}
.exam-menu>summary{margin:0;padding:9px 3px;font-size:11px;max-width:210px;overflow-wrap:anywhere}
.exam-menu .top-nav{position:absolute;right:0;top:100%;z-index:8;background:white;border:1px solid var(--line);border-radius:10px;box-shadow:0 8px 25px #132e561a;padding:9px;display:grid;width:190px;gap:3px;overflow:visible}
.exam-menu .nav-button{text-align:left;font-size:12px;padding:10px}
.exam-menu .account-button{margin:0;padding:9px;border:0;justify-content:flex-start}
.exam-menu .account-name{display:inline}
.exam-page{max-width:1440px;padding:12px 22px 28px}
.exam-heading{gap:12px;margin-bottom:10px}
.exam-heading h1{font-size:18px;line-height:1.4}
.exam-heading h1>span{font-weight:500;font-size:11px;color:var(--muted);margin-left:7px}
.exam-meta{gap:12px;margin-top:3px;font-size:11px}
.exam-meta strong{font-weight:650;color:var(--brand-blue)}
.exam-page .timer-box{min-width:105px}
.exam-page .timer-value{font-size:24px;line-height:1.3;margin-top:0}
.exam-page .timer-label{font-size:10px;letter-spacing:0}
.exam-page .timer-box .field-help{font-size:10px;margin-top:2px}
.exam-layout{grid-template-columns:minmax(0,1fr) 215px;gap:14px}
.exam-page .question-panel{padding:14px 18px;min-width:0}
.exam-page .question-top{padding:0 0 9px;border:0;align-items:center;gap:10px}
.exam-page .question-number{font-size:17px;margin:0}
.question-image-box{height:clamp(180px,calc(100vh - 300px),700px);height:clamp(180px,calc(100dvh - 300px),700px);min-height:0;max-height:none;overflow:visible;display:flex;align-items:center;justify-content:center;border:0;scrollbar-gutter:auto;background:white}
.question-image-box .question-image{width:100%;height:100%;object-fit:contain;max-width:100%;max-height:100%;margin:0}
.question-image-box.fit-width{height:auto}
.question-image-box.fit-width .question-image{height:auto;max-height:none}
.question-image-tools{display:flex;align-items:center;gap:15px;margin:7px 0 10px;min-height:34px;flex-wrap:wrap}
.question-image-tools .btn{font-size:11px}
.question-info{position:relative;margin-left:auto}
.question-info>summary{font-size:11px;margin:0;padding:7px 0;white-space:nowrap}
.question-info>div{position:absolute;z-index:5;right:0;top:100%;width:min(320px,calc(100vw - 60px));padding:15px;background:white;border:1px solid var(--line);box-shadow:0 7px 22px #132e561a;border-radius:9px;color:var(--muted);font-size:11px;line-height:1.8}
.question-info p{margin-top:8px}
.exam-page .answer-option{min-height:42px;padding:9px;font-size:14px}
.exam-page .answer-footer{margin-top:5px;min-height:29px}
.exam-page .question-navigation{padding-top:10px;margin-top:8px}
.exam-page .answer-card{padding:15px;top:12px}
.answer-card-details>summary{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:12px;padding:4px 0;margin:0;list-style:none}
.answer-card-details>summary::-webkit-details-marker{display:none}
.answer-card-details>summary:after{content:"＋";font-size:16px;line-height:1;color:var(--brand-blue)}
.answer-card-details[open]>summary:after{content:"−"}
.answer-card-details>summary>span{font-size:10px;color:var(--muted);margin-left:auto}
.answer-card-body{padding-top:8px}
.answer-card-help>summary{font-size:10px;margin-top:8px}
.answer-card-help .card-legend{margin-top:7px}
.exam-page .question-grid{margin:12px 0}
.exam-page .exam-action{padding-top:12px;margin-top:12px}
.review-image-reader{margin-top:9px}
.question-reader-open{overflow:hidden}
.question-reader{position:fixed;inset:0;max-width:none;max-height:none;width:100%;height:100%;height:100dvh;margin:0;padding:14px 18px;border:0;background:#f4f7fb;color:var(--ink);z-index:200;box-sizing:border-box}
.question-reader[open]{display:grid;grid-template-rows:auto auto minmax(0,1fr);gap:10px}
.question-reader::backdrop{background:#132e56b3}
.reader-heading{display:flex;align-items:center;justify-content:space-between;gap:15px}
.reader-heading h2{font-size:16px;color:var(--brand-blue);margin:0}
.reader-tools{display:flex;gap:9px;align-items:center;flex-wrap:wrap}
.reader-tools .btn{min-width:35px}
.reader-tools p{font-size:11px;color:var(--muted);margin-left:6px}
.reader-zoom{font-size:11px;min-width:40px;text-align:center;font-variant-numeric:tabular-nums}
.reader-viewport{min-height:0;min-width:0;overflow:auto;overscroll-behavior:contain;background:white;border:1px solid var(--line);border-radius:8px;touch-action:pan-x pan-y pinch-zoom}
.reader-viewport:focus-visible{outline:3px solid var(--brand-red);outline-offset:2px}
.reader-stage{display:grid;place-items:center;min-width:100%;min-height:100%;width:max-content;box-sizing:border-box;padding:16px}
.reader-image{display:block;max-width:none;max-height:none;width:auto;height:auto;margin:0;background:white}
@media(max-width:1000px){
 .exam-layout{grid-template-columns:1fr;gap:10px}
 .exam-page{padding:10px 16px 20px}
 .exam-page .question-panel{padding:12px 16px}
 .exam-page .answer-card{position:static;padding:11px 15px}
 .answer-card-details>summary{min-height:27px}
 .exam-page .exam-action{display:flex;gap:8px;padding-top:9px;margin-top:7px}
 .exam-action .btn{flex:1;min-height:38px;font-size:12px}
 .exam-page .question-grid{grid-template-columns:repeat(9,1fr)}
 .question-image-box{height:clamp(180px,calc(100vh - 340px),680px);height:clamp(180px,calc(100dvh - 340px),680px)}
 .question-image-box.fit-width{height:auto}
}
@media(max-width:760px){
 .exam-header{height:44px;min-height:44px;padding:0 12px;flex-wrap:nowrap}
 .exam-header .brand{gap:7px}
 .exam-header .brand-name{font-size:12px}
 .exam-header .brand-mark{width:25px;height:25px;font-size:21px}
 .exam-menu>summary{font-size:10px;max-width:140px}
 .exam-menu .top-nav{width:180px;order:initial}
 .exam-page{padding:8px 10px 15px}
 .exam-heading{margin-bottom:8px;gap:7px}
 .exam-heading h1{font-size:16px}
 .exam-heading h1>span{font-size:10px;margin-left:4px}
 .exam-meta{font-size:10px;gap:8px}
 .exam-page .timer-box{min-width:92px}
 .exam-page .timer-value{font-size:22px}
 .exam-page .timer-label{font-size:9px}
 .exam-page .question-panel{padding:10px 12px}
 .exam-page .question-number{font-size:16px}
 .exam-page .flag-btn{font-size:10px;padding:6px 7px}
 .question-image-tools{gap:10px;margin:6px 0 9px}
 .question-image-tools .btn{font-size:10px}
 .question-image-tools .btn.secondary{padding:7px 9px;min-height:32px}
 .question-info>summary{font-size:10px}
 .exam-page .option-grid{gap:7px}
 .exam-page .answer-option{min-height:40px;padding:8px}
 .exam-page .answer-footer{font-size:10px;gap:8px}
 .exam-page .question-navigation{padding-top:9px;margin-top:5px}
 .exam-page .question-navigation .btn{min-height:34px;padding:7px 10px}
 .exam-page .question-grid{grid-template-columns:repeat(7,1fr)}
 .question-reader{padding:10px;gap:8px}
 .reader-heading h2{font-size:14px}
 .reader-tools{gap:7px}
 .reader-tools .btn{font-size:11px;padding:7px 10px}
 .reader-tools p{flex-basis:100%;margin:0;font-size:10px}
}
@media(max-width:360px){.exam-heading h1>span{display:block;margin-left:0}.question-image-tools{gap:7px}.question-info>summary{font-size:9px}}
.reader-timer{font-size:11px;color:var(--muted);margin-left:auto;font-variant-numeric:tabular-nums}
.reader-timer strong{font-size:17px;color:var(--brand-blue)}
.reader-timer strong.urgent{color:var(--brand-red)}
@media(max-width:420px){.reader-timer{font-size:10px}.reader-timer strong{font-size:14px}.reader-heading{gap:8px}}

/* User tools stay separate from the scrollable practice navigation. */
.app-header>.top-nav{margin-left:auto}
.profile-menu{position:relative;flex:none}
.profile-menu .account-button{margin:0;border-left:1px solid var(--line);border-radius:8px;white-space:nowrap;gap:8px}
.profile-menu .account-button[aria-expanded=true]{background:var(--soft);color:var(--brand-blue)}
.profile-chevron{font-size:15px;color:var(--muted)}
.profile-actions{position:absolute;right:0;top:calc(100% + 9px);z-index:30;width:min(224px,calc(100vw - 36px));padding:8px;border:1px solid var(--line);border-radius:12px;background:white;box-shadow:0 12px 30px #132e5624}
.profile-identity{padding:9px 11px 12px;border-bottom:1px solid var(--line);margin-bottom:5px;overflow-wrap:anywhere}
.profile-identity strong{display:block;font-size:13px;color:var(--brand-blue)}
.profile-identity span{display:block;margin-top:3px;font-size:11px;color:var(--muted)}
.profile-actions [role=menuitem]{display:block;width:100%;text-align:left;border-radius:7px;background:white;color:var(--ink);padding:11px 12px;font-size:13px;min-height:42px}
.profile-actions [role=menuitem]:hover,.profile-actions [role=menuitem]:focus-visible{background:var(--soft);color:var(--brand-blue)}
.profile-actions [data-action=logout]{color:var(--brand-red)}
.account-panel,.password-panel{max-width:580px}
.account-details{margin-bottom:0}
.account-details dt{color:var(--muted);flex:none}
.account-details dd{margin:0;overflow-wrap:anywhere;text-align:right}
.password-panel h1{font-size:26px}
.password-panel .password-form{max-width:none}
.password-panel .subtitle{margin-bottom:25px;line-height:1.8;overflow-wrap:anywhere}
.password-gate{min-height:calc(100dvh - 82px);max-width:660px;margin:0 auto;padding:50px 40px}
.password-gate-header .btn{margin-left:auto}
.exam-header{gap:14px}
.exam-header .profile-menu .account-button{padding:5px 7px;font-size:11px;border:0;gap:5px}
.exam-header .profile-menu .avatar{width:24px;height:24px;font-size:10px}
.exam-menu{margin-left:auto}
@media(max-width:760px){
 .app-header:not(.exam-header):not(.password-gate-header){display:grid;grid-template-columns:minmax(0,1fr) auto;column-gap:8px;row-gap:10px}
 .app-header>.top-nav{grid-column:1/-1;grid-row:2;width:100%;margin:0}
 .app-header>.profile-menu{grid-column:2;grid-row:1}
 .profile-menu .account-button{border:0;padding:5px 0 5px 7px;font-size:12px;gap:6px}
 .profile-menu .avatar{width:27px;height:27px;font-size:11px}
 .profile-actions{top:calc(100% + 8px)}
 .password-gate{padding:28px 18px;min-height:calc(100dvh - 80px)}
 .password-panel h1{font-size:23px}
 .exam-header{gap:8px}
 .exam-header .brand-name .muted{display:none}
 .exam-menu>summary{white-space:nowrap;max-width:none;padding:9px 0}
 .exam-header .profile-menu .account-button{font-size:10px;padding:5px 0 5px 3px}
 .exam-header .profile-menu .avatar{display:none}
 .exam-header .profile-chevron{font-size:12px}
 .exam-header .profile-actions{width:210px}
}
@media(max-width:360px){.app-header:not(.exam-header) .brand-caption{letter-spacing:.3px}.profile-menu .avatar{display:none}.profile-menu .account-button{gap:4px}.exam-header .brand-name{font-size:11px}.password-panel h1{font-size:21px}}

/* 紧凑练习入口：保留可读字号和操作尺寸，做题视图保持原有整图布局。 */
.app-header:not(.exam-header){height:64px;padding:0 28px;gap:20px}
.app-header:not(.exam-header) .brand{gap:10px;min-width:0}
.app-header:not(.exam-header) .brand-mark{width:35px;height:35px;border-radius:10px;font-size:28px}
.app-header:not(.exam-header) .brand-name{font-size:15px;white-space:nowrap}
.app-header:not(.exam-header) .nav-button{min-height:40px;padding:8px 12px}
.app-header:not(.exam-header) .account-button{min-height:40px;padding:5px 10px}
.page:not(.exam-page){max-width:1240px;padding:22px 28px 34px}
.page:not(.exam-page) .page-heading{gap:16px;align-items:center;margin-bottom:16px}
.page:not(.exam-page) .page-heading h1{font-size:25px;letter-spacing:-.4px;line-height:1.35}
.page:not(.exam-page) .subtitle{font-size:13px;line-height:1.6;margin-top:7px}
.page:not(.exam-page) .panel{padding:20px;border-radius:13px}
.page:not(.exam-page) h2{font-size:19px}
.page:not(.exam-page) .btn{min-height:40px;padding:9px 15px;font-size:13px}
.page:not(.exam-page) .btn.small{padding:8px 12px}
.page:not(.exam-page) .btn.text{padding:8px 0}
.page:not(.exam-page) .flag-btn,.page:not(.exam-page) .filter-button{min-height:40px;font-size:13px}
.page:not(.exam-page) input,.page:not(.exam-page) select{min-height:40px;padding:9px 12px;border-radius:8px;font-size:14px}
.page:not(.exam-page) input[type=checkbox]{min-height:0;width:18px;height:18px;padding:0;flex:none}
.page:not(.exam-page) label>input,.page:not(.exam-page) label>select{margin-top:5px}
.page:not(.exam-page) .panel-header{margin-bottom:15px;gap:12px}
.page:not(.exam-page) .toolbar{margin-bottom:14px;gap:12px}
.page:not(.exam-page) .filter-row{margin-bottom:14px;gap:12px}
.page:not(.exam-page) .wrong-start{padding:12px 15px;margin-bottom:15px;gap:10px}
.page:not(.exam-page) .wrong-start p{font-size:13px}
.page:not(.exam-page) .wrong-start input{width:75px;min-width:0;flex:none}
.page:not(.exam-page) .review-card{padding:16px 18px}
.page:not(.exam-page) .results-hero{padding:22px 26px;border-radius:13px;margin-bottom:18px;gap:26px}
.page:not(.exam-page) .score{font-size:52px}
.page:not(.exam-page) .score-caption{font-size:13px}
.page:not(.exam-page) .banner{margin-bottom:16px;padding:11px 15px;font-size:13px}
.page:not(.exam-page) .account-details{margin-top:16px;gap:12px}
.page:not(.exam-page) .account-details div{padding-bottom:11px}
.page:not(.exam-page) .admin-copy{margin-top:12px;font-size:13px}
.page:not(.exam-page) .password-form label{margin:12px 0}
.dashboard-page.page{padding-top:18px}
.dashboard-page.page .page-heading{margin-bottom:14px}
.dashboard-page .page-heading .tag{font-size:12px}
.dashboard-page .dashboard-grid{grid-template-columns:minmax(0,2fr) minmax(275px,1fr);gap:18px;align-items:start}
.dashboard-page .practice-settings{min-width:0}
.dashboard-page .section-label{font-size:13px;line-height:1.5;gap:8px;margin:12px 0 8px;flex-wrap:wrap}
.dashboard-page .practice-settings>.section-label:first-child{margin-top:0}
.dashboard-page .step{width:20px;height:20px;font-size:11px;flex:none}
.dashboard-page .mode-grid{gap:8px}
.dashboard-page .choice-card,.dashboard-page .choice-card.selected{border-width:1px;padding:11px 12px;min-height:66px}
.dashboard-page .choice-card strong{font-size:14px;line-height:1.5;margin-bottom:3px;padding-right:9px}
.dashboard-page .choice-card small{font-size:13px;line-height:1.5}
.dashboard-page .choice-check{right:7px;top:7px;width:13px;height:13px}
.dashboard-page .module-grid{gap:8px}
.dashboard-page .module-choice{min-height:40px;padding:8px 12px;font-size:13px;gap:7px}
.dashboard-page .module-rule,.dashboard-page .quantity-range{font-size:13px;color:var(--muted);font-weight:500}
.dashboard-page .field-grid{grid-template-columns:minmax(0,1.7fr) minmax(120px,1fr);gap:12px}
.dashboard-page .check-row{margin-top:6px;min-height:36px;font-size:13px;gap:9px}
.dashboard-page .check-row input{margin-top:0!important}
.dashboard-page .start-row{margin-top:12px;padding-top:12px;gap:15px}
.dashboard-page .start-row .btn{flex:none;min-height:42px}
.dashboard-page .session-summary{font-size:13px;line-height:1.6}
.dashboard-page .session-summary strong{font-size:17px}
.dashboard-page .session-rule{display:block;font-size:13px;margin-top:3px}
.dashboard-page .dashboard-aside{gap:16px;grid-template-columns:1fr}
.dashboard-page .continuation h3{font-size:16px;margin-bottom:12px}
.continuation .btn:not(.secondary):not(.light):not(.text){color:white}
.dashboard-page .stats-grid{margin-top:16px;gap:18px 14px}
.dashboard-page .stat-value{font-size:26px;line-height:1.3}
.dashboard-page .stat-label{font-size:13px;line-height:1.5;margin-top:4px}
.dashboard-page .stat-unit{font-size:13px}
.dashboard-page .progress-track{margin-top:16px}
.dashboard-page .progress-panel>.btn{margin-top:8px}
.login-story{padding:40px 9%;justify-content:center;gap:55px}
.login-story .brand-name,.login-story .brand-name .muted{color:white}
.login-story h1{font-size:clamp(32px,4vw,48px);line-height:1.5;margin:0;font-weight:600;letter-spacing:-.7px}
.login-form-area{padding:32px}
.login-box h2{font-size:25px;margin-bottom:8px}
.login-box label{margin-top:14px}
.login-box .btn{margin-top:20px}
.login-note{padding:0;border:0;margin-top:17px;font-size:13px}
.password-gate{padding:30px 28px;min-height:calc(100dvh - 64px)}
.password-gate .panel{padding:24px}
.password-gate .subtitle{margin:10px 0 18px;font-size:13px}
@media(max-width:1000px){
 .app-header:not(.exam-header){padding:0 20px;gap:12px}
 .page:not(.exam-page){padding:20px 20px 28px}
 .dashboard-page .dashboard-grid{grid-template-columns:minmax(0,1.8fr) minmax(235px,1fr);gap:14px}
 .dashboard-page .choice-card,.dashboard-page .choice-card.selected{padding:10px 9px}
 .dashboard-page .module-choice{padding:8px 10px}
 .dashboard-page .field-grid{grid-template-columns:minmax(0,1fr) 110px}
 .dashboard-page .start-row{gap:10px}
}
@media(max-width:760px){
 .app-header:not(.exam-header):not(.password-gate-header){height:auto;min-height:0;padding:10px 14px 6px;column-gap:8px;row-gap:4px}
 .app-header:not(.exam-header) .brand-mark{width:31px;height:31px;font-size:25px;border-radius:9px}
 .app-header:not(.exam-header) .brand-name{font-size:13px}
 .app-header:not(.exam-header) .top-nav{padding-bottom:0;gap:2px}
 .app-header:not(.exam-header) .nav-button{font-size:13px;padding:8px 11px;min-height:40px}
 .app-header:not(.exam-header) .profile-menu .account-button{padding:5px 0 5px 7px;min-height:40px;font-size:12px}
 .app-header:not(.exam-header) .profile-menu .avatar{width:25px;height:25px}
 .page:not(.exam-page){padding:16px 12px 24px}
 .page:not(.exam-page) .page-heading{margin-bottom:13px;gap:10px;flex-wrap:wrap}
 .page:not(.exam-page) .page-heading h1{font-size:23px}
 .page:not(.exam-page) .panel{padding:16px}
 .page:not(.exam-page) .results-hero{padding:20px;gap:20px}
 .page:not(.exam-page) .review-card{padding:15px}
 .page:not(.exam-page) .score{font-size:46px}
 .dashboard-page .dashboard-grid{grid-template-columns:1fr;gap:14px}
 .dashboard-page .dashboard-aside{grid-template-columns:1fr;gap:14px}
 .dashboard-page .mode-grid{gap:6px}
 .dashboard-page .choice-card,.dashboard-page .choice-card.selected{padding:10px 8px;min-height:72px}
 .dashboard-page .choice-card strong{font-size:13px;padding-right:0}
 .dashboard-page .choice-card small{font-size:13px;line-height:1.4}
 .dashboard-page .choice-check{width:11px;height:11px;font-size:8px;top:4px;right:4px}
 .dashboard-page .field-grid{grid-template-columns:minmax(0,1fr) 105px;gap:10px}
 .dashboard-page .start-row{gap:12px;align-items:center}
 .dashboard-page .start-row .btn{padding:9px 13px}
 .dashboard-page .module-rule{flex-basis:100%;margin-left:28px}
 .dashboard-page .stats-grid{gap:16px}
 .login-story{padding:24px;min-height:170px;gap:22px}
 .login-story h1{font-size:26px;margin:0;line-height:1.4}
 .login-story h1 br{display:none}
 .login-form-area{padding:26px 24px 36px}
 .login-box{width:min(420px,calc(100vw - 48px))}
 .password-gate-header{height:64px!important;padding:0 14px!important}
 .password-gate{padding:20px 12px;min-height:calc(100dvh - 64px)}
 .password-gate .panel{padding:18px}
 .password-gate .btn{min-height:40px}
}
@media(max-width:360px){
 .app-header:not(.exam-header) .brand-name{font-size:12px}
 .app-header:not(.exam-header) .profile-menu .avatar{display:none}
 .dashboard-page .field-grid{grid-template-columns:minmax(0,1fr) 95px}
 .dashboard-page .choice-card strong{font-size:12px}
 .dashboard-page .start-row{gap:8px}
}

/* 考试界面：原题占据主体，题目导航按需打开。 */
.exam-header{max-width:none;margin:0;height:46px;min-height:46px;padding:0 24px;border-bottom:0;background:white}
.exam-page{max-width:none;padding:0 0 94px;background:white;min-height:calc(100dvh - 46px)}
.exam-heading{margin:0;padding:12px 26px;background:var(--brand-blue);color:white;gap:16px;min-height:66px}
.exam-heading h1{font-size:21px;letter-spacing:0;line-height:1.3}
.exam-heading h1>span{font-size:12px;color:#d8e4f5;margin-left:10px}
.exam-title{display:flex;gap:18px;align-items:center;min-width:0}
.exam-module-stage{font-size:12px;color:#d8e4f5;white-space:nowrap}
.exam-heading-status{display:flex;gap:24px;align-items:center;flex:none}
.exam-page .timer-box{display:flex;align-items:center;gap:8px;min-width:0}
.exam-page .timer-label{font-size:12px;color:#d8e4f5;letter-spacing:0}
.exam-page .timer-value{font-size:24px;line-height:1.2;letter-spacing:.4px;color:white;margin:0;font-weight:650}
.exam-page .timer-value.urgent{color:#ffd0d5}
.exam-page .question-number{font-size:17px;margin:0;white-space:nowrap;font-variant-numeric:tabular-nums}
.exam-page .question-count{font-size:14px;color:#d8e4f5}
.exam-toolbar{min-height:44px;padding:4px 24px;display:flex;justify-content:space-between;align-items:center;gap:16px;background:#eef3fa;border-bottom:1px solid var(--line)}
.exam-page .flag-btn{border:0;background:transparent;color:var(--brand-blue);font-size:12px;min-height:34px;padding:7px 8px;white-space:nowrap}
.exam-page .flag-btn.on{background:var(--red-soft);color:var(--brand-red)}
.exam-page .question-image-tools{margin:0;min-height:34px;gap:18px;flex-wrap:nowrap}
.exam-page .question-image-tools .btn{padding:7px 0;font-size:12px;min-height:32px;white-space:nowrap}
.exam-page .question-info{margin-left:0}
.exam-page .question-info>summary{font-size:12px;padding:7px 0}
.exam-page .question-panel{padding:14px 28px 18px;background:white;border:0;border-radius:0;box-shadow:none;max-width:none}
.exam-page .question-image-box{height:clamp(180px,calc(100vh - 330px),780px);height:clamp(180px,calc(100dvh - 330px),780px);justify-content:flex-start;max-width:1360px;margin:0 auto}
.exam-page .question-image-box .question-image{object-position:left center}
.exam-page .question-image-box.fit-width{height:auto}
.exam-page .question-image-box.fit-width .question-image{height:auto;max-height:none}
.exam-page .answer-area{max-width:1360px;margin:10px auto 0}
.exam-page .option-grid{display:flex;flex-wrap:wrap;gap:9px;max-width:900px}
.exam-page .answer-option{display:inline-flex;align-items:center;justify-content:flex-start;gap:10px;border:1px solid transparent;border-radius:7px;background:white;color:var(--ink);min-height:42px;min-width:71px;padding:8px 13px;font-size:15px;font-weight:550}
.exam-page .answer-option:hover:not(:disabled){background:var(--soft)}
.exam-page .answer-option.selected{background:var(--soft);border-color:var(--brand-blue);color:var(--brand-blue)}
.answer-radio{display:block;width:17px;height:17px;border:1.5px solid #8a96a8;border-radius:50%;background:white;flex:none}
.answer-option.selected .answer-radio{border-color:var(--brand-blue);box-shadow:inset 0 0 0 3px white;background:var(--brand-blue)}
.exam-page .answer-footer{justify-content:flex-start;gap:18px;min-height:30px;margin-top:1px;font-size:11px}
.exam-page .answer-footer .btn{font-size:11px;padding:5px 0;min-height:28px}
.exam-footer{position:fixed;bottom:0;left:0;right:0;z-index:20;display:flex;justify-content:space-between;align-items:center;gap:16px;min-height:58px;padding:8px 24px calc(8px + env(safe-area-inset-bottom));background:var(--brand-blue);border-top:3px solid var(--brand-red);box-shadow:0 -3px 14px #132e5617}
.exam-end-actions,.exam-footer-movement{display:flex;align-items:center;gap:9px}
.exam-footer .btn{min-height:37px;padding:7px 13px;white-space:nowrap;color:white;border-radius:5px;font-size:13px;border:1px solid #ffffff54;background:transparent!important}
.exam-footer .btn:hover:not(:disabled){background:#ffffff1a!important}
.exam-footer .exam-end{border-color:#d5a4ac}
.exam-footer .next-module{background:var(--brand-red)!important;border-color:var(--brand-red)}
.exam-footer .exam-navigator-toggle{border-color:#d3e0f4}
.exam-footer .btn:focus-visible{outline-color:white;outline-offset:2px}
.exam-navigator-open{overflow:hidden}
.exam-navigator{position:fixed;inset:0;margin:auto;width:min(800px,calc(100vw - 36px));max-width:none;height:auto;max-height:min(680px,calc(100vh - 56px));max-height:min(680px,calc(100dvh - 56px));padding:0;border:1px solid var(--brand-blue);border-top:4px solid var(--brand-red);border-radius:9px;background:white;color:var(--ink);box-shadow:0 18px 80px #132e564a;z-index:200;overflow:hidden}
.exam-navigator[open]{display:flex;flex-direction:column}
.exam-navigator::backdrop{background:#132e5670}
.navigator-heading{display:flex;align-items:center;gap:14px;padding:15px 18px;background:var(--brand-blue);color:white;flex:none}
.navigator-heading h2{font-size:19px;line-height:1.4;letter-spacing:0}
.navigator-heading h2 span{font-size:12px;font-weight:500;margin-left:8px;color:#d3e0f4}
.navigator-heading p{font-size:11px;line-height:1.5;margin-top:3px;color:#d3e0f4}
.navigator-close{margin-left:auto;background:transparent;color:white;font-size:26px;width:34px;height:34px;line-height:1;border-radius:5px;padding:0;flex:none}
.navigator-close:hover{background:#ffffff1a}
.navigator-close:focus-visible{outline-color:white;outline-offset:0}
.navigator-timer{margin-left:auto;font-size:11px;white-space:nowrap;color:#d3e0f4;font-variant-numeric:tabular-nums}
.navigator-timer strong{font-size:18px;color:white}
.navigator-timer strong.urgent{color:#ffd0d5}
.navigator-timer+.navigator-close{margin-left:0}
.navigator-filters{display:flex;gap:5px;padding:9px 16px;background:#f6f8fc;border-bottom:1px solid var(--line);flex:none}
.navigator-filters button{background:transparent;color:var(--muted);border-radius:5px;padding:7px 12px;font-size:12px;min-height:32px}
.navigator-filters button.active{background:var(--soft);color:var(--brand-blue);font-weight:650}
.navigator-table-wrap{overflow:auto;min-height:0;max-height:440px;overscroll-behavior:contain;flex:1;background:white}
.navigator-table{border-collapse:separate;border-spacing:0;width:100%;table-layout:fixed;font-size:13px}
.navigator-table th{position:sticky;top:0;z-index:1;text-align:left;background:#e8eef7;color:var(--brand-blue);font-weight:650;padding:11px 20px;border-bottom:1px solid #c8d4e5}
.navigator-table th:first-child{width:32%}
.navigator-table th:nth-child(2){width:30%}
.navigator-table td{height:43px;padding:0 20px;border-bottom:1px solid var(--line)}
.navigator-table tr:nth-child(even){background:#f8fafd}
.navigator-table tr:hover{background:var(--soft);cursor:pointer}
.navigator-table tr.current{background:#f9e7e9}
.navigator-table td:first-child{padding:0}
.navigator-table [data-nav-index]{display:block;width:100%;text-align:left;padding:11px 20px;background:transparent;color:var(--ink);font-size:13px;min-height:43px;border-radius:0}
.navigator-table [data-nav-index][aria-current]{font-weight:700;color:var(--brand-red)}
.navigator-table [data-nav-index]:focus-visible{outline-offset:-3px}
.navigator-status.answered{color:var(--brand-blue)}
.navigator-status.incomplete{color:var(--brand-red)}
.navigator-status.paused{color:var(--muted)}
.navigator-table [data-nav-flag]{color:var(--brand-red);white-space:nowrap}
.navigator-footer{display:flex;justify-content:space-between;align-items:center;gap:14px;padding:12px 17px;border-top:1px solid var(--line);background:#f6f8fc;flex:none}
.navigator-footer>div{display:flex;gap:18px;flex-wrap:wrap;color:var(--muted);font-size:12px}
.navigator-empty{text-align:center;padding:28px;color:var(--muted);font-size:13px}
@media(max-width:760px){
 .exam-header{padding:0 14px;flex-wrap:nowrap}
 .exam-page{padding:0 0 90px}
 .exam-heading{padding:10px 16px;min-height:61px;gap:10px}
 .exam-heading h1{font-size:18px}
 .exam-heading h1>span{font-size:11px;margin-left:7px}
 .exam-title{display:block}
 .exam-module-stage{font-size:10px;margin-top:3px}
 .exam-heading-status{gap:17px}
 .exam-page .timer-label{font-size:10px}
 .exam-page .timer-value{font-size:22px}
 .exam-toolbar{padding:4px 12px;gap:8px}
 .exam-page .question-image-tools{gap:12px}
 .exam-page .question-panel{padding:12px 16px 18px}
 .exam-footer{padding:8px 14px calc(8px + env(safe-area-inset-bottom));gap:8px}
 .exam-end-actions,.exam-footer-movement{gap:6px}
 .exam-footer .btn{padding:7px 10px;font-size:12px}
}
@media(max-width:600px){
 .exam-heading{min-height:60px;padding:9px 12px;align-items:center}
 .exam-heading h1{font-size:16px}
 .exam-heading h1>span{display:block;margin:2px 0 0;font-size:10px}
 .exam-heading-status{display:block;text-align:right}
 .exam-page .timer-box{gap:5px;justify-content:flex-end}
 .exam-page .timer-value{font-size:19px}
 .exam-page .question-number{font-size:13px;margin-top:2px}
 .exam-page .question-count{font-size:11px}
 .exam-page .flag-btn{font-size:11px;padding:7px 3px}
 .exam-page .question-image-tools{gap:10px}
 .exam-page .question-image-tools .btn,.exam-page .question-info>summary{font-size:10px}
 .exam-page .question-panel{padding:11px 12px 16px}
 .exam-page .question-image-box{height:clamp(180px,calc(100vh - 332px),720px);height:clamp(180px,calc(100dvh - 332px),720px)}
 .exam-page .question-image-box.fit-width{height:auto}
 .exam-page .option-grid{gap:4px}
 .exam-page .answer-option{min-width:64px;min-height:39px;padding:7px 11px;gap:8px;font-size:14px}
 .exam-footer{padding:7px 8px calc(7px + env(safe-area-inset-bottom));min-height:55px;gap:7px}
 .exam-footer .btn{padding:7px 8px;font-size:11px;min-height:35px}
 .exam-end-actions,.exam-footer-movement{gap:4px}
 .exam-footer.mock-intermediate{flex-direction:column-reverse;align-items:stretch;gap:7px;min-height:97px}
 .exam-footer.mock-intermediate .exam-end-actions{justify-content:space-between}
 .exam-footer.mock-intermediate .exam-footer-movement{justify-content:space-between}
 .exam-page:has(.exam-footer.mock-intermediate){padding-bottom:140px}
 .exam-page:has(.exam-footer.mock-intermediate) .question-image-box:not(.fit-width){height:clamp(160px,calc(100vh - 380px),720px);height:clamp(160px,calc(100dvh - 380px),720px)}
 .exam-navigator{width:calc(100vw - 20px);max-height:calc(100vh - 32px);max-height:calc(100dvh - 32px);border-radius:7px}
 .navigator-heading{padding:12px;gap:8px}
 .navigator-heading h2{font-size:17px}
 .navigator-heading h2 span{display:block;margin:1px 0 0;font-size:10px}
 .navigator-heading p{font-size:10px}
 .navigator-timer{font-size:10px}
 .navigator-timer strong{font-size:15px}
 .navigator-filters{padding:7px 10px}
 .navigator-table th{padding:10px 11px;font-size:12px}
 .navigator-table td{padding:0 11px;font-size:12px}
 .navigator-table [data-nav-index]{padding:11px;font-size:12px}
 .navigator-table-wrap{max-height:calc(100dvh - 228px)}
 .navigator-footer{padding:10px 12px}
 .navigator-footer>div{font-size:11px;gap:8px}
}

/* Plain exam name badge; 科桥 red and blue remain the interface colours. */
:root{--exam-accent:#20a86a;--exam-soft:#edf7f1;--exam-ink:#146344}
.brand-mark.exam-wordmark{position:relative;width:50px;height:35px;padding:0 0 3px;border:1px solid #20a86a33;border-radius:7px;background:var(--exam-soft);color:var(--exam-ink);font:800 12px/1 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;letter-spacing:.35px;flex:none}
.brand-mark.exam-wordmark::after{content:"";position:absolute;bottom:4px;left:50%;width:16px;height:2px;transform:translateX(-50%);border-radius:2px;background:var(--exam-accent)}
.app-header:not(.exam-header) .brand-mark.exam-wordmark{width:50px;height:35px;border-radius:7px;font-size:12px}
.exam-header .brand-mark.exam-wordmark{width:44px;height:26px;border-radius:5px;font-size:10px;padding-bottom:3px}
.exam-header .brand-mark.exam-wordmark::after{width:13px;height:2px;bottom:3px}
.login-story .brand-mark.exam-wordmark{width:80px;height:48px;border-color:#c9e6d5;background:var(--exam-soft);color:var(--exam-ink);border-radius:8px;font-size:17px;padding-bottom:4px}
.login-story .brand-mark.exam-wordmark::after{width:24px;bottom:6px}
@media(max-width:360px){.app-header:not(.exam-header) .brand{gap:7px}.app-header:not(.exam-header) .brand-mark.exam-wordmark{width:46px;font-size:11px}}