:root{--ink:#262721;--muted:#74756c;--paper:#f6f5f0;--white:#fff;--line:#e3e2d9;--red:#7d2332;--red-soft:#f6ebed;--green:#426b56;--shadow:0 8px 32px #25272005;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}body{margin:0;font-size:15px;line-height:1.7}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button,.button{display:inline-flex;justify-content:center;align-items:center;gap:8px;min-height:44px;padding:10px 22px;border:1px solid var(--red);border-radius:7px;background:var(--red);color:white;text-decoration:none;font-weight:600;cursor:pointer;transition:background .15s,box-shadow .15s}button:hover,.button:hover{background:#65202c}button:disabled{opacity:.45;cursor:not-allowed}button.secondary,.button.secondary{background:white;border-color:var(--line);color:var(--ink)}button.secondary:hover,.button.secondary:hover{background:var(--paper)}button.small{min-height:34px;padding:5px 12px;font-size:13px}a{color:var(--red);text-underline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #b77c88;outline-offset:3px}input,textarea,select{width:100%;border:1px solid #d8d8cf;border-radius:6px;background:white;color:var(--ink);padding:11px 13px}textarea{resize:vertical;min-height:112px}input[type=checkbox],input[type=radio]{width:18px;height:18px;padding:0;accent-color:var(--red);flex-shrink:0}input:disabled,textarea:disabled{background:#f0f0eb;color:var(--muted)}label.field{display:block;margin:20px 0 0;font-weight:600}label.field input,label.field textarea{display:block;margin-top:8px;font-weight:400}h1,h2,h3,p{margin:0}h1{font-size:36px;line-height:1.35;font-weight:650;letter-spacing:-1px}h2{font-size:23px;line-height:1.5;font-weight:650}h3{font-size:17px;font-weight:650}p+p{margin-top:12px}.muted{color:var(--muted)}.eyebrow{font-size:11px;letter-spacing:2px;font-weight:700;color:var(--red);margin-bottom:13px}.site-header{max-width:1200px;margin:auto;padding:28px 40px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:20px}.brand{color:var(--ink);text-decoration:none;font-weight:650;font-size:18px;line-height:1.5}.brand span{display:block;font-size:11px;font-weight:400;letter-spacing:1px;color:var(--muted);margin-top:4px}.quiet-link{font-size:13px;color:var(--muted);text-decoration:none;white-space:nowrap}.quiet-link:hover{color:var(--red)}.page{max-width:1120px;margin:0 auto;padding:54px 0 64px;min-height:calc(100vh - 200px)}.site-footer{max-width:1120px;margin:0 auto;padding:22px 0;border-top:1px solid var(--line);font-size:10px;letter-spacing:1.4px;color:#898b80;display:flex;justify-content:space-between}.site-footer span{letter-spacing:2px}.loading{text-align:center;color:var(--muted);padding:80px 0}.entry{max-width:920px;margin:35px auto 60px;display:grid;grid-template-columns:1fr 390px;gap:80px;align-items:center}.entry-copy h1{max-width:450px}.entry-copy .intro{margin-top:22px;font-size:15px;line-height:1.9;color:var(--muted)}.course-mark{font:italic 80px Georgia,serif;color:#d9d2c8;margin:0 0 24px;line-height:1}.entry-note{display:flex;gap:12px;align-items:flex-start;border-top:1px solid var(--line);padding-top:23px;margin-top:40px;color:var(--muted);font-size:13px}.entry-note span:first-child{color:var(--red)}.card{background:white;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);padding:30px}.entry-card h2{font-size:23px}.entry-card .badge{margin-bottom:16px}.entry-card button{width:100%;margin-top:26px}.entry-card .hint{font-size:12px;color:var(--muted);margin-top:16px}.badge{display:inline-flex;gap:6px;align-items:center;border-radius:99px;padding:4px 11px;font-size:12px;background:#efefea;color:var(--muted);white-space:nowrap}.badge:before{content:"";width:5px;height:5px;border-radius:50%;background:currentColor}.badge.open{background:#edf3ee;color:var(--green)}.badge.closed{background:var(--red-soft);color:var(--red)}.notice{padding:11px 14px;border-radius:6px;background:#edf3ee;color:#345c44;font-size:13px;margin-top:18px}.notice.error{background:#fff0ed;color:#9c3524}.notice[hidden]{display:none}.topline{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:28px}.topline h1{font-size:28px;letter-spacing:0}.identity{font-size:13px;margin-top:8px;color:var(--muted)}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:24px;align-items:start}.question-card{padding:34px 38px}.question-meta{display:flex;align-items:center;gap:12px;font-size:12px;color:var(--muted);margin-bottom:25px}.question-meta .kind{color:var(--red);background:var(--red-soft);border-radius:4px;padding:3px 8px}.question-stem{font-size:18px;line-height:1.9;margin-bottom:28px;overflow-wrap:break-word}.text-paragraph{display:block}.text-paragraph+.text-paragraph{margin-top:10px}.option{display:flex;gap:13px;align-items:flex-start;border:1px solid var(--line);border-radius:8px;padding:15px 17px;margin-top:12px;cursor:pointer;transition:border-color .12s,background .12s}.option:hover{border-color:#c0a3a8}.option.selected{border-color:var(--red);background:#fbf5f6}.option input{margin:5px 0 0}.option-letter{font-weight:650;color:var(--muted);width:16px;flex-shrink:0}.option.selected .option-letter{color:var(--red)}.option .rich{min-width:0}.question-actions{display:flex;justify-content:space-between;gap:16px;border-top:1px solid var(--line);margin-top:30px;padding-top:24px}.answer-panel{padding:22px;position:sticky;top:24px}.answer-panel h3{font-size:15px}.save-state{font-size:12px;color:var(--green);min-height:42px;margin:12px 0;line-height:1.5}.save-state.warning{color:#a15b24}.progress-track{height:4px;background:#edede7;border-radius:5px;margin:14px 0 20px;overflow:hidden}.progress-fill{height:100%;background:var(--red);transition:width .15s}.number-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}.number-button{padding:0;min-height:33px;font-size:12px;font-weight:400;border-color:var(--line);background:white;color:var(--muted);border-radius:5px}.number-button:hover{background:var(--paper)}.number-button.answered{background:var(--red-soft);border-color:#e3cbd0;color:var(--red)}.number-button.current{outline:2px solid var(--red);outline-offset:1px;font-weight:700}.panel-submit{width:100%;margin-top:22px}.panel-hint{font-size:11px;color:var(--muted);margin-top:12px}.receipt{max-width:580px;margin:40px auto;text-align:center;padding:44px}.receipt-symbol{display:grid;place-items:center;width:60px;height:60px;margin:0 auto 22px;border-radius:50%;background:#edf3ee;color:var(--green);font-size:28px}.receipt h1{font-size:30px;margin-bottom:12px}.receipt-details{text-align:left;padding:20px 0;margin:24px 0;border-block:1px solid var(--line);display:grid;grid-template-columns:auto 1fr;gap:10px 30px;font-size:14px}.receipt-details dt{color:var(--muted)}.receipt-details dd{margin:0;text-align:right}.score{font-size:42px;color:var(--red);line-height:1.4}.score small{font-size:16px;color:var(--muted)}dialog{width:min(560px,calc(100vw - 32px));border:1px solid var(--line);border-radius:14px;padding:32px;color:var(--ink);box-shadow:0 20px 100px #0002}dialog::backdrop{background:#1c201d66;backdrop-filter:blur(2px)}dialog h2{margin-bottom:16px}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}.actions.right{justify-content:flex-end}.login-card{max-width:420px;margin:60px auto}.login-card button{width:100%;margin-top:22px}.admin-layout{display:grid;grid-template-columns:1fr 1fr;gap:24px}.admin-card{padding:26px}.admin-card h2{font-size:19px}.help{font-size:12px;color:var(--muted);margin-top:7px}.check-field{display:flex;gap:10px;align-items:center;font-size:13px;margin-top:20px}.check-field input{margin:0}.selection-count{font-size:12px;color:var(--red);margin-top:10px;min-height:22px}.bank-toolbar{display:flex;align-items:center;gap:12px;margin-top:20px}.bank-toolbar select{font-size:13px;padding:7px 10px;max-width:170px}.bank-list{height:300px;overflow-y:auto;border-block:1px solid var(--line);margin-top:13px}.bank-row{display:flex;gap:10px;align-items:center;padding:10px 0;border-bottom:1px solid #f1f1eb;font-size:13px}.bank-row label{display:flex;gap:10px;align-items:center;flex:1;min-width:0;cursor:pointer}.bank-row input{margin:0;width:16px;height:16px}.bank-row .bank-title{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.bank-row .bank-id{color:var(--muted);font-size:12px}.bank-row button{background:transparent;color:var(--red);border:0;font-weight:400;padding:2px 4px;min-height:30px;font-size:12px}.results{margin-top:28px}.results-heading{display:flex;justify-content:space-between;align-items:center;gap:12px}.results-heading h2{font-size:21px}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:22px 0}.stat{padding:19px 22px;border:1px solid var(--line);background:white;border-radius:9px}.stat span{display:block;font-size:12px;color:var(--muted)}.stat strong{display:block;font-size:29px;font-weight:550;line-height:1.5;margin-top:3px;font-variant-numeric:tabular-nums}.results-tools{display:flex;gap:12px;align-items:center;margin:18px 0;font-size:12px;color:var(--muted)}.results-tools select{max-width:460px;font-size:13px;padding:8px 12px}.table-wrap{overflow-x:auto;background:white;border:1px solid var(--line);border-radius:9px}table{border-collapse:collapse;width:100%;text-align:left;white-space:nowrap;font-size:13px}th{padding:12px 18px;background:#fafaf7;font-weight:500;color:var(--muted);border-bottom:1px solid var(--line)}td{padding:13px 18px;border-bottom:1px solid #efefe9}tr:last-child td{border-bottom:0}.empty-cell{text-align:center;padding:45px;color:var(--muted)}.dialog-close{float:right;margin-bottom:18px}#preview-content{clear:both}#preview-content .rich{margin:14px 0}.preview-answer{padding:18px;background:var(--paper);border-radius:6px;margin-top:22px}.katex{font-size:1.08em}.katex-display{overflow-x:auto;overflow-y:hidden;padding:5px 0}
@media(max-width:1200px){.page{margin:0 32px}.site-footer{margin:0 32px}.entry{gap:45px}}
@media(max-width:800px){.site-header{padding:22px 24px}.page{margin:0 24px;padding:36px 0 45px}.site-footer{margin:0 24px}.entry{grid-template-columns:1fr;gap:30px;margin:0 auto;max-width:440px}.course-mark{display:none}.entry-copy h1{font-size:30px}.entry-copy .intro{margin-top:14px}.entry-note{display:none}.entry-card{padding:26px}.workspace{grid-template-columns:1fr}.answer-panel{position:static;order:-1;padding:18px 22px}.answer-panel .number-grid{grid-template-columns:repeat(10,1fr)}.answer-panel .panel-submit{width:auto;margin-top:16px}.answer-panel .save-state{min-height:0;margin:8px 0}.answer-panel .progress-track{margin:10px 0 15px}.answer-panel .panel-hint{display:none}.question-card{padding:26px}.topline{align-items:flex-start}.topline h1{font-size:24px}.admin-layout{grid-template-columns:1fr}.stats{gap:10px}.stat{padding:14px}.stat strong{font-size:25px}.site-footer{font-size:8px;letter-spacing:1px}.results-tools{flex-wrap:wrap}}
@media(max-width:480px){.site-header{padding:19px 18px}.brand{font-size:16px}.brand span{font-size:10px}.quiet-link{font-size:12px}.page{margin:0 16px;padding-top:28px}.entry-copy h1{font-size:28px}.entry-copy .eyebrow{margin-bottom:8px}.entry-card{padding:23px}.entry-card h2{font-size:21px}.question-card{padding:23px 20px}.question-stem{font-size:16px}.option{padding:13px 11px;gap:9px}.answer-panel .number-grid{grid-template-columns:repeat(8,1fr)}.topline{gap:10px}.topline h1{font-size:21px}.topline .badge{font-size:10px;padding:4px 8px}.question-actions button{padding:9px 16px}.receipt{margin:12px auto;padding:28px 22px}.receipt-details{gap:10px 12px}.site-footer span{display:none}.admin-card{padding:21px}.stats{grid-template-columns:repeat(2,1fr)}.results-heading{align-items:flex-start}.results-heading .button{font-size:12px;padding:8px 12px}.actions button{padding:9px 16px}dialog{padding:25px}}
.seat-directions{background:var(--paper);border:1px solid var(--line);padding:18px 22px;border-radius:8px;text-align:center;font-size:14px}.seat-directions strong{display:block;background:#e5e0d7;max-width:240px;margin:0 auto 12px;border-radius:4px;padding:5px}.seat-directions p+p{margin-top:4px}.info-fields{display:grid;grid-template-columns:1fr 1fr;gap:0 20px}.info-fields input[readonly]{background:#f4f4ef;color:var(--muted)}.entry-note span:first-child{white-space:nowrap;flex-shrink:0}@media(max-width:600px){.info-fields{grid-template-columns:1fr}.seat-directions{padding:15px;font-size:13px}}
#attempt-details{width:min(1120px,calc(100vw - 32px));max-height:90vh}#attempt-details-content{clear:both}.attempt-score-summary{margin-top:16px;font-weight:600}.attempt-question-table{min-width:800px;white-space:normal}.attempt-question-table th,.attempt-question-table td{padding:12px;vertical-align:top}.attempt-question-table td:first-child,.attempt-question-table td:last-child{white-space:nowrap}.attempt-question-table td:nth-child(2){min-width:160px}.attempt-question-table td:nth-child(3){max-width:240px;overflow-wrap:anywhere}.question-detail-link{display:inline;background:transparent;border:0;border-radius:0;padding:0;min-height:0;color:var(--red);font-size:13px;text-align:left;font-weight:500;text-decoration:underline;text-underline-offset:3px}.question-detail-link:hover{background:transparent;color:#4c1520}.answer-result{font-weight:600;white-space:nowrap}.answer-result.correct,.answer-result.complete{color:var(--green)}.answer-result.incorrect,.answer-result.incomplete{color:#a73525}.answer-result.partial,.answer-result.unanswered{color:#94601e}.answer-result.pending{color:var(--muted)}
/* Personal records and private teacher attendance */
.section-title { margin-top: 2rem; }
.history-card, .review-question { padding: 1.5rem; margin: 1rem 0; }
.history-card h3 { margin-top: 0; }
.history-card .score { margin: .7rem 0; font-size: 2.4rem; }
.review-question .rich { margin: .7rem 0; }
.grading-note { color: var(--accent, #7d2332); font-weight: 600; }
.private-avatar, .avatar-placeholder { width: 48px; height: 48px; border-radius: 50%; object-fit: cover; flex-shrink: 0; }
.avatar-placeholder { display: inline-grid; place-items: center; background: #eee4df; color: #71303b; font-weight: 600; }
.avatar-button { background: transparent; color: inherit; display: flex; gap: .7rem; align-items: center; padding: 0; white-space: nowrap; }
.attendance-table th { white-space: pre-line; min-width: 110px; }
.attendance-table td { vertical-align: middle; }
.attendance-status { padding: .45rem .65rem; font-size: .82rem; white-space: nowrap; }
.attendance-status.present, .attendance-status.excused { background: #e3eee5; color: #245438; }
.attendance-status.absent { background: #f6e5e7; color: #7d2332; }
.attendance-status.pending { background: #f8edce; color: #755711; }
.student-dialog { max-width: 620px; width: calc(100% - 2rem); }
.student-dialog textarea { min-height: 90px; }
.student-dialog .private-avatar, .student-dialog .avatar-placeholder { width: 96px; height: 96px; }
.grade-edit { padding: 1rem; background: #f7f3ee; margin: 1rem 0; }
.results-tools input[type=search] { min-width: 200px; flex: 1; }
@media (max-width: 700px) { .results-tools { flex-wrap: wrap; } .results-tools select { max-width: 100%; } .history-card, .review-question { padding: 1rem; } }
.avatar-button { border: 0; min-width: max-content; justify-content: flex-start; }
.avatar-button:hover { background: #f5f1ec; color: var(--ink); }

.teacher-login-banner{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.paper-source{margin:16px 0;padding:16px}.paper-source summary{cursor:pointer;font-weight:600}.paper-source img{margin-top:16px}