:root{--ss-snap:#f97316;--ss-snap-600:#ea580c;--ss-sort:#2563eb;--ss-sort-600:#1d4ed8;--ss-bg:#f7f8fa;--ss-surface:#fff;--ss-ink:#1f2937;--ss-ink-soft:#4b5563;--ss-muted:#6b7280;--ss-line:#e5e7eb;--ss-line-strong:#d1d5db;--ss-ok:#16a34a;--ss-ok-bg:#ecfdf5;--ss-bad:#dc2626;--ss-bad-bg:#fef2f2;--ss-warn:#d97706;--ss-warn-bg:#fffbeb;--ss-dunno:#7c3aed;--ss-dunno-bg:#f5f3ff;--ss-radius:14px;--ss-radius-sm:10px;--ss-shadow:0 1px 2px #1018280f, 0 4px 16px #1018280f;--ss-shadow-lg:0 8px 30px #1018281f;--sp-1:4px;--sp-2:8px;--sp-3:12px;--sp-4:16px;--sp-5:20px;--sp-6:24px;--sp-8:32px;--fs-sm:clamp(.82rem, .78rem + .2vw, .92rem);--fs-base:clamp(.95rem, .9rem + .3vw, 1.05rem);--fs-lg:clamp(1.1rem, 1rem + .6vw, 1.3rem);--fs-xl:clamp(1.35rem, 1.1rem + 1.2vw, 1.8rem);--fs-2xl:clamp(1.7rem, 1.3rem + 2vw, 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var(--sp-4);color:var(--ss-muted);font-weight:600;font-size:var(--fs-base);white-space:nowrap;border-bottom:2.5px solid #0000;flex:none;margin-bottom:-1px;text-decoration:none}.tch-tab:hover{color:var(--ss-ink)}.tch-tab.active{color:var(--ss-snap);border-bottom-color:var(--ss-snap)}.tch-head{justify-content:space-between;align-items:flex-end;gap:var(--sp-3);margin-bottom:var(--sp-4);display:flex}.tch-head h2{font-size:var(--fs-xl)}.tch-head p{font-size:var(--fs-sm);margin-top:2px}.tch-subhead{margin:var(--sp-5) 0 var(--sp-3);font-size:var(--fs-lg)}.tch-back{font-size:var(--fs-sm);color:var(--ss-muted);font-weight:600;text-decoration:none;display:inline-block}.tch-back:hover{color:var(--ss-sort)}.tch-filters{gap:var(--sp-3);margin-bottom:var(--sp-4);flex-wrap:wrap;display:flex}.tch-filter{flex-direction:column;gap:4px;display:flex}.tch-filter-grow{flex:200px}.tch-filter-lbl{font-size:var(--fs-sm);color:var(--ss-muted);font-weight:600}.tch-select{min-height:40px;padding:0 var(--sp-3);border:1px solid var(--ss-line-strong);border-radius:var(--ss-radius-sm);color:var(--ss-ink);font:inherit;font-size:var(--fs-sm);background:#fff}.tch-select:focus{border-color:var(--ss-sort);outline:none;box-shadow:0 0 0 3px #2563eb26}.tch-search{min-height:40px}.tch-legend{gap:var(--sp-4);margin-bottom:var(--sp-3);font-size:var(--fs-sm);color:var(--ss-muted);flex-wrap:wrap;display:flex}.tch-legend-item{align-items:center;gap:6px;display:inline-flex}.tch-dot{border-radius:3px;width:10px;height:10px;display:inline-block}.tch-dot.wrong{background:var(--ss-bad)}.tch-dot.dunno{background:var(--ss-dunno)}.tch-dot.timeout{background:var(--ss-warn)}.tch-table-wrap{-webkit-overflow-scrolling:touch;border:1px solid var(--ss-line);border-radius:var(--ss-radius);background:var(--ss-surface);box-shadow:var(--ss-shadow);overflow-x:auto}.tch-table{border-collapse:collapse;width:100%;font-size:var(--fs-sm)}.tch-table thead th{text-align:left;color:var(--ss-ink-soft);padding:var(--sp-3) var(--sp-3);border-bottom:1px solid var(--ss-line);white-space:nowrap;background:#f9fafb;font-weight:700;position:sticky;top:0}.tch-table td{padding:var(--sp-3) var(--sp-3);border-bottom:1px solid var(--ss-line);vertical-align:middle}.tch-table tbody tr:last-child td{border-bottom:none}.tch-row.clickable{cursor:pointer}.tch-row.clickable:hover{background:#f7faff}.tch-row.disabled{opacity:.55}.tch-num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}.tch-cell-name{min-width:180px}.tch-table-wrap.tch-list{width:fit-content;max-width:100%}.tch-table-wrap.tch-list .tch-table{width:auto}.tch-table-wrap.tch-list .tch-cell-name{min-width:0}.tch-topic-name,.tch-student-name{color:var(--ss-ink);font-weight:600}.tch-topic-chap,.tch-qtype,.tch-student-meta{margin-top:2px;font-size:.78rem}.tch-chev{color:var(--ss-line-strong);text-align:center;width:1.5em;font-size:1.3em}.tch-time{white-space:nowrap;font-size:.8rem}.tch-stem{color:var(--ss-ink);display:block}.tch-stem.clamp{-webkit-line-clamp:2;-webkit-box-orient:vertical;display:-webkit-box;overflow:hidden}.tch-report-ctx{margin:var(--sp-2) 0;padding:var(--sp-2) var(--sp-3);border-radius:var(--ss-radius);border:1px solid var(--ss-line);background:#f7f8fa}.tch-report-attempt{font-size:var(--fs-base);line-height:1.7}.tch-report-attempt .ra-lbl{color:var(--ss-muted);font-size:var(--fs-sm);margin-right:4px}.tch-report-attempt .ra-val{font-weight:600}.tch-report-attempt .ra-sep{color:var(--ss-line-strong);margin:0 4px}.tch-report-attempt .ra-mark{font-weight:700;font-size:var(--fs-sm)}.tch-report-attempt .ra-mark.ok{color:var(--ss-ok)}.tch-report-attempt .ra-mark.bad{color:var(--ss-bad)}.tch-report-stat{font-size:var(--fs-sm);margin-top:2px}.tch-report-hint{margin-top:var(--sp-2);font-size:var(--fs-sm);border-radius:8px;padding:6px 10px;font-weight:600}.tch-report-hint.bug{background:var(--ss-bad-bg);color:var(--ss-bad);border:1px solid var(--ss-bad)}.tch-report-hint.device{background:var(--ss-warn-bg);color:var(--ss-warn)}.tch-report-hint.ok{background:var(--ss-ok-bg);color:var(--ss-ok)}.tch-reply-toggle{border:1px dashed var(--ss-line-strong);color:var(--ss-ink-soft);font:inherit;font-size:var(--fs-sm);cursor:pointer;background:0 0;border-radius:8px;padding:7px 12px}.tch-reply-toggle:hover{border-color:var(--ss-sort);color:var(--ss-sort)}.tch-reply-box{margin:var(--sp-2) 0}.tch-reply-box[hidden]{display:none}.tch-reply-hint{font-size:var(--fs-sm);margin-bottom:4px}.tch-reply-area{border:1.5px solid 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