.nhd28-summary{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:0 0 14px}
.nhd28-summary .card{padding:15px 17px;display:flex;flex-direction:column;gap:3px;min-width:0}
.nhd28-summary b{font-size:22px;color:#1F3864;line-height:1.05}
.nhd28-summary span{font-size:12px;color:#6f7f95}
.nhd28-filter-grid{display:grid;grid-template-columns:minmax(220px,1.7fr) repeat(6,minmax(130px,1fr));gap:8px;margin-bottom:10px}
.nhd28-filter-grid input,.nhd28-filter-grid select{width:100%;min-width:0}
.nhd28-filter-actions{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:0 0 12px}
.nhd28-filter-actions .pill{margin-left:auto}
.nhd28-labels{display:flex;flex-wrap:wrap;gap:4px;margin-top:7px}
.nhd28-label{display:inline-flex;align-items:center;border-radius:999px;padding:3px 7px;font:700 10px/1.2 "Segoe UI",sans-serif;background:#eef3f8;color:#53657c;border:1px solid #dce5ef;white-space:nowrap}
.nhd28-label.l-thieu_hinh,.nhd28-label.l-xung_dot_ma_cau,.nhd28-label.l-can_kiem_tra_noi_dung{background:#fff0ea;color:#9b3f17;border-color:#f3c7b5}
.nhd28-label.l-chua_co_dap_an,.nhd28-label.l-chua_co_loi_giai,.nhd28-label.l-chua_xac_dinh_muc_do{background:#fff8df;color:#7d6114;border-color:#eddc9b}
.nhd28-label.l-can_kiem_tra_phan_loai{background:#eef4ff;color:#315f9d;border-color:#cbdaf0}
.nhd28-label.l-gan_giong_90,.nhd28-label.l-gan_giong_95{background:#f2ecff;color:#6540a1;border-color:#d9cbef}
.nhd28-label.l-gan_giong_95{background:#eee5ff;color:#512d91;border-color:#cbb8ed}
.nhd28-stem-main{font-family:"Times New Roman",serif;font-size:15px;line-height:1.45;color:#1d2a3d;max-width:620px;white-space:normal}
.nhd28-score{display:inline-flex;min-width:54px;justify-content:center;border-radius:999px;padding:5px 8px;font-weight:800;background:#f2ecff;color:#5b3995}
.nhd28-score.high{background:#eadfff;color:#43217e}
.nhd28-pages{display:flex;align-items:center;justify-content:center;gap:7px;padding:13px;border-top:1px solid #e4eaf1}
.nhd28-pages button{border:1px solid #d6e0ea;background:#fff;border-radius:8px;padding:6px 10px;cursor:pointer;color:#38516d}
.nhd28-pages button.on{background:#1F3864;color:#fff;border-color:#1F3864}
.nhd28-pages button:disabled{opacity:.4;cursor:not-allowed}
.nhd28-compare{display:grid;gap:12px}
.nhd28-pair{display:grid;grid-template-columns:86px minmax(0,1fr) 34px minmax(0,1fr);gap:12px;align-items:stretch;padding:14px}
.nhd28-pair-score{display:grid;place-items:center;border-right:1px solid #e0e7ef}
.nhd28-pair-score b{font-size:24px;color:#5a3693}
.nhd28-pair-score small{color:#7d8ca0}
.nhd28-pair-q{min-width:0;display:flex;flex-direction:column;gap:6px}
.nhd28-pair-q p{margin:0;font-family:"Times New Roman",serif;font-size:15px;line-height:1.42;color:#233147}
.nhd28-pair-q small{color:#718096}
.nhd28-pair-arrow{display:grid;place-items:center;color:#9aa8ba;font-size:20px}
.nhd28-audit{margin:14px 0 0;display:grid;grid-template-columns:1fr 1fr;gap:12px}
.nhd28-audit>.card{padding:0;overflow:hidden}
.nhd28-audit-head{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid #e6ebf1}
.nhd28-audit-body{padding:14px 16px;display:grid;gap:9px}
.nhd28-source,.nhd28-near{border:1px solid #e2e8f0;border-radius:10px;padding:10px 11px;display:flex;gap:8px;align-items:flex-start;justify-content:space-between}
.nhd28-source small,.nhd28-near small{color:#748398}
.nhd28-source div,.nhd28-near div{display:grid;gap:3px;min-width:0}
.nhd28-check-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.nhd28-result-title{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:8px 10px;border-radius:9px;background:#eef4ff;color:#385c8f}.nhd28-result-title b{font-size:11px}.nhd28-result-title span{font-size:10px}
.nhd28-muted{color:#7b899c;font-size:12px}
.nhd28-tf-wrap{display:grid;gap:12px;margin-top:8px}
.nhd28-tf-item{border:1px solid #dfe6ef;border-radius:12px;background:#fbfcfe;padding:12px}
.nhd28-tf-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.nhd28-tf-head b{display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:#1F3864;color:#fff;text-transform:lowercase}
.nhd28-tf-grid{display:grid;grid-template-columns:1.2fr 1.2fr .7fr;gap:8px;margin:8px 0}
.nhd28-tf-item textarea{width:100%;min-height:64px}
.nhd28-tf-item textarea.nhd28-tf-solution{min-height:50px}
.nhd28-tab-count{display:inline-grid;place-items:center;min-width:20px;height:20px;padding:0 5px;margin-left:4px;border-radius:999px;background:#eee7fb;color:#58358e;font-size:10px;font-weight:800}
.nhd28-alert{border:1px solid #efcc9b;background:#fff8e9;color:#70531b;padding:10px 12px;border-radius:10px;margin:0 0 12px}
@media(max-width:1280px){.nhd28-filter-grid{grid-template-columns:repeat(3,minmax(160px,1fr))}.nhd28-filter-grid input{grid-column:span 2}.nhd28-summary{grid-template-columns:repeat(2,1fr)}}
@media(max-width:820px){.nhd28-summary,.nhd28-audit{grid-template-columns:1fr}.nhd28-filter-grid{grid-template-columns:1fr}.nhd28-filter-grid input{grid-column:auto}.nhd28-pair{grid-template-columns:70px 1fr}.nhd28-pair-arrow{display:none}.nhd28-pair-q:last-child{grid-column:2}.nhd28-tf-grid{grid-template-columns:1fr}.nhd28-table-hide-mobile{display:none}}

/* Bản 28.2.1: giao diện tra cứu gọn, không dùng bảng rộng gây đè chữ. */
.nhd28-overview{display:grid;grid-template-columns:minmax(210px,1.25fr) minmax(180px,.75fr) minmax(180px,.75fr);gap:0;margin:0 0 12px;padding:0;overflow:hidden;border:1px solid #dfe6ef}
.nhd28-overview-title{padding:13px 17px;display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.nhd28-overview-title small{width:100%;font-size:9px;letter-spacing:1px;color:#8190a4}
.nhd28-overview-title b{font-size:18px;color:#1F3864}
.nhd28-overview-title span{font-size:12px;color:#718096}
.nhd28-stat{border:0;border-left:1px solid #e2e8f0;background:#f8faff;padding:11px 15px;display:grid;grid-template-columns:auto 1fr;grid-template-rows:auto auto;column-gap:9px;text-align:left;cursor:pointer;color:#38516d;transition:.15s}
.nhd28-stat:hover{background:#eef4ff}
.nhd28-stat b{grid-row:1/3;font-size:25px;line-height:1;color:#4f3a8c;align-self:center}
.nhd28-stat span{font-size:12px;font-weight:700;align-self:end}
.nhd28-stat em{font-style:normal;font-size:10px;color:#6f5ba6;align-self:start}
.nhd28-stat.high{background:#f6f1ff}.nhd28-stat.high:hover{background:#eee5ff}.nhd28-stat.high b{color:#50288f}

.nhd28-search-panel{padding:12px 14px;margin-bottom:12px}
.nhd28-search-row{display:grid;grid-template-columns:minmax(280px,1fr) auto auto auto;gap:8px;align-items:center}
.nhd28-search-row input{width:100%;min-width:0;height:40px}
.nhd28-search-row .pill{white-space:nowrap}
.nhd28-advanced{margin-top:9px;border-top:1px solid #e7ecf2;padding-top:8px}
.nhd28-advanced summary{cursor:pointer;color:#38516d;font-weight:700;font-size:12px;list-style:none;display:flex;align-items:center;gap:8px}
.nhd28-advanced summary::-webkit-details-marker{display:none}
.nhd28-advanced summary:before{content:'▸';font-size:11px;transition:.15s}.nhd28-advanced[open] summary:before{transform:rotate(90deg)}
.nhd28-advanced summary span{margin-left:auto;color:#7b899c;font-size:10px;font-weight:500}
.nhd28-advanced .nhd28-filter-grid{display:grid;grid-template-columns:repeat(4,minmax(150px,1fr));gap:8px;margin:10px 0 2px}
.nhd28-filter-grid label{display:grid;gap:4px;font-size:9px;text-transform:uppercase;letter-spacing:.6px;color:#7b899c;font-weight:700}
.nhd28-filter-grid select{width:100%;min-width:0;height:38px;text-transform:none;letter-spacing:0;color:#263a56;font-size:12px;font-weight:500}
.nhd28-search-tools{display:flex;align-items:center;gap:8px;margin-top:9px}
.nhd28-search-tools span{margin-left:auto;font-size:11px;color:#748398}

.nhd28-question-list{display:grid;gap:8px}
.nhd28-qcard{display:grid;grid-template-columns:minmax(160px,190px) minmax(0,1fr) minmax(145px,175px);gap:14px;align-items:center;padding:12px 14px;overflow:hidden}
.nhd28-qcode{min-width:0;display:grid;gap:6px;align-self:start}
.nhd28-qcode .ma{display:block;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nhd28-qcode small{font-size:10px;color:#78879b}
.nhd28-qmain{min-width:0;border-left:1px solid #e4eaf1;padding-left:14px}
.nhd28-qpath{margin-top:5px;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#708198;font-size:10.5px}
.nhd28-qmeta{display:grid;grid-template-columns:1fr auto;gap:7px;align-items:center;min-width:0}
.nhd28-qmeta>span{font-size:10.5px;color:#6f7e92;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nhd28-qmeta>b{font-size:10px;border-radius:7px;background:#eef4fb;color:#315a87;padding:4px 6px}
.nhd28-qmeta .nhd28-score,.nhd28-qmeta .nhd-sm,.nhd28-qmeta>small{grid-column:1/3;width:100%}
.nhd28-qmeta>small{font-size:10px;color:#8995a6;text-align:center}
.nhd28-qmeta .nhd28-score{border:0;cursor:pointer;font-size:10.5px}
.nhd28-pages{margin-top:10px;background:#fff;border:1px solid #e1e7ee;border-radius:12px}

.nhd28-compare-toolbar{display:flex;align-items:center;gap:16px;justify-content:space-between;padding:12px 14px;margin-bottom:10px}
.nhd28-compare-toolbar>div:first-child{display:grid;gap:3px}.nhd28-compare-toolbar b{color:#1F3864}.nhd28-compare-toolbar span{font-size:11px;color:#748398}
.nhd28-threshold{display:flex;gap:7px;white-space:nowrap}
.nhd28-active-filter{display:flex;align-items:center;gap:6px;padding:8px 12px;margin-bottom:10px;border-radius:10px;background:#eef4ff;color:#385c8f;font-size:11px}
.nhd28-active-filter button{margin-left:auto;border:0;background:transparent;color:#375f97;cursor:pointer;font-weight:700}
.nhd28-pair{display:block;padding:0;overflow:hidden}
.nhd28-pair-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 12px;border-bottom:1px solid #e4e9f0;background:#fafbfe}
.nhd28-pair-head>div{display:flex;align-items:center;gap:8px}.nhd28-pair-head small{color:#718096;font-size:10px}
.nhd28-pair-body{display:grid;grid-template-columns:minmax(0,1fr) 32px minmax(0,1fr);gap:10px;padding:12px}
.nhd28-pair-q small{display:block;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.nhd28-compare-modal{z-index:130;padding:12px}
.nhd28-compare-modal .nhd-modal-box{width:min(1180px,98vw);max-height:96vh;display:flex;flex-direction:column;overflow:hidden}
.nhd28-compare-modal .nhd-modal-head>div{display:grid;gap:2px}.nhd28-compare-modal .nhd-modal-head small{font-size:9px;letter-spacing:1px;color:#7d8ca0}.nhd28-compare-modal .nhd-modal-head h3{font-size:17px}
.nhd28-compare-modal-body{display:grid;grid-template-columns:1fr 1fr;min-height:0;overflow:auto;background:#f3f6fa}
.nhd28-compare-question{padding:17px 19px;background:#fff;min-width:0}
.nhd28-compare-question+section{border-left:1px solid #dce4ed}
.nhd28-compare-qhead{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:7px}
.nhd28-compare-qhead>b{color:#1F3864}.nhd28-compare-qhead .ma{max-width:75%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.nhd28-compare-path{font-size:10.5px;color:#718096;margin-bottom:13px;white-space:normal;overflow-wrap:anywhere}
.nhd28-compare-stem{font:16px/1.55 "Times New Roman",serif;color:#15243a;margin-bottom:12px}
.nhd28-compare-options{display:grid;gap:7px;margin-bottom:10px}
.nhd28-compare-options>div{display:grid;grid-template-columns:25px minmax(0,1fr);gap:7px;padding:7px 8px;border-radius:8px;background:#f7f9fc;font:14px/1.4 "Times New Roman",serif}
.nhd28-compare-options>div>b{font-family:"Segoe UI",sans-serif;color:#2E74B5}
.nhd28-compare-source{display:flex;flex-wrap:wrap;gap:5px;margin:10px 0}.nhd28-compare-source span{font-size:9px;padding:3px 6px;border-radius:6px;background:#eef3f8;color:#62738a}
.nhd28-compare-actions{padding:11px 15px;border-top:1px solid #dfe6ee;align-items:center}.nhd28-compare-actions span{margin-right:auto;font-size:10.5px;color:#7b899c}

@media(max-width:1100px){.nhd28-advanced .nhd28-filter-grid{grid-template-columns:repeat(3,minmax(140px,1fr))}.nhd28-qcard{grid-template-columns:150px minmax(0,1fr)}.nhd28-qmeta{grid-column:1/3;display:flex;border-top:1px solid #e7ecf2;padding-top:8px}.nhd28-qmeta .nhd28-score,.nhd28-qmeta .nhd-sm,.nhd28-qmeta>small{grid-column:auto;width:auto;margin-left:auto}}
@media(max-width:760px){.nhd28-overview{grid-template-columns:1fr}.nhd28-stat{border-left:0;border-top:1px solid #e2e8f0}.nhd28-search-row{grid-template-columns:1fr 1fr}.nhd28-search-row input{grid-column:1/3}.nhd28-search-row .pill{justify-self:end}.nhd28-advanced .nhd28-filter-grid{grid-template-columns:1fr 1fr}.nhd28-qcard{grid-template-columns:1fr}.nhd28-qmain{border-left:0;border-top:1px solid #e5ebf2;padding:10px 0 0}.nhd28-qmeta{grid-column:1;flex-wrap:wrap}.nhd28-pair-body{grid-template-columns:1fr}.nhd28-pair-arrow{display:none}.nhd28-compare-toolbar{align-items:flex-start;flex-direction:column}.nhd28-compare-modal-body{grid-template-columns:1fr}.nhd28-compare-question+section{border-left:0;border-top:1px solid #dce4ed}}
@media(max-width:480px){.nhd28-advanced .nhd28-filter-grid{grid-template-columns:1fr}.nhd28-search-row{display:flex;flex-wrap:wrap}.nhd28-search-row input{flex:1 0 100%}.nhd28-compare-actions span{display:none}}

/* Link cố định từng câu */
.nhd28-link-actions{grid-column:1/3;display:grid;grid-template-columns:1fr auto auto;gap:5px}
.nhd28-link-actions .nhd-sm{width:100%}
.nhd28-direct-link{display:flex;justify-content:space-between;gap:14px;align-items:center;padding:12px 14px;margin-bottom:12px;border-style:dashed}
.nhd28-direct-link>div:first-child{display:grid;gap:3px;min-width:0}
.nhd28-direct-link small{font-size:10px;color:#718096;font-weight:800;letter-spacing:.06em}
.nhd28-direct-link b{font-size:12px}
.nhd28-direct-link span{font-size:10.5px;color:#5e6e82;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:680px}
.nhd28-direct-link>div:last-child{display:flex;gap:6px;flex:none}
.nhd28-near-actions{display:flex;gap:5px;align-items:center}
@media(max-width:760px){.nhd28-link-actions{grid-column:auto;grid-template-columns:1fr auto auto;width:100%}.nhd28-direct-link{align-items:flex-start;flex-direction:column}.nhd28-direct-link>div:last-child{width:100%;flex-wrap:wrap}}