/* Trích từ tệp thi-thu-tot-nghiep.txt — CSS độc lập trang */

/* CSS chỉ tác động tới #iduExam26 và lớp popup idu-exam26- */
#iduExam26{--ie-blue:#2563eb;--ie-cyan:#06b6d4;--ie-ink:#17233b;--ie-muted:#64748b;--ie-line:#e2e8f0;color:var(--ie-ink);font-family:inherit;font-size:14px;line-height:1.55;max-width:1120px;margin:0 auto 40px}
#iduExam26 *,#iduExam26 *::before,#iduExam26 *::after{box-sizing:border-box}
#iduExam26 button,#iduExam26 input,#iduExam26 select{font:inherit}
#iduExam26 button{cursor:pointer;color:inherit}
#iduExam26 button:focus-visible,#iduExam26 a:focus-visible,#iduExam26 select:focus-visible,#iduExam26 input:focus-visible{outline:3px solid #93c5fd;outline-offset:2px}
#iduExam26 .idu-exam26-tabs{display:flex;gap:10px;padding:5px;border-radius:18px;background:#f1f5f9;border:1px solid #e2e8f0}
#iduExam26 .idu-exam26-tab{flex:1;min-height:46px;border:0;border-radius:13px;background:transparent;font-size:12px;font-weight:900;color:#64748b;transition:background .2s,color .2s,box-shadow .2s,transform .2s}
#iduExam26 .idu-exam26-tab:hover{background:#fff}
#iduExam26 .idu-exam26-tab.is-active{background:linear-gradient(115deg,#2563eb,#4f46e5);box-shadow:0 7px 18px #2563eb30;color:#fff}
#iduExam26 .idu-exam26-tab i{margin-right:6px}
#iduExam26 .idu-exam26-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:15px 0 12px;padding:15px 16px;border:1px solid #e2e8f0;border-radius:17px;background:#fff}
#iduExam26 .idu-exam26-toolbar-copy{display:flex;flex-direction:column;gap:2px;min-width:0}
#iduExam26 .idu-exam26-toolbar-copy strong{font-size:19px;font-weight:900}
#iduExam26 .idu-exam26-toolbar-copy small{color:#64748b;font-size:11px}
#iduExam26 .idu-exam26-select-wrap{position:relative;display:flex;align-items:center;gap:8px;flex:0 0 auto}
#iduExam26 .idu-exam26-select-label{font-size:11px;font-weight:800;color:#64748b}
#iduExam26 .idu-exam26-select-wrap select{min-width:150px;height:42px;appearance:none;border:1px solid #cbd5e1;border-radius:12px;padding:0 35px 0 12px;background:#fff;color:#1e293b;font-size:12px;font-weight:800;cursor:pointer}
#iduExam26 .idu-exam26-select-wrap>i{position:absolute;right:12px;color:#64748b;font-size:10px;pointer-events:none}
#iduExam26 .idu-exam26-feed-status{color:#64748b;font-size:11px;margin:0 0 7px;min-height:0}
#iduExam26 .idu-exam26-list{display:flex;flex-direction:column;gap:13px;min-height:100px}
#iduExam26 .idu-exam26-loading,#iduExam26 .idu-exam26-empty{padding:35px 18px;border:1px dashed #cbd5e1;border-radius:18px;background:#f8fafc;text-align:center;font-size:12px;font-weight:750;color:#64748b}
#iduExam26 .idu-exam26-spinner{display:block;margin:0 auto 11px;width:30px;height:30px;border:3px solid #dbeafe;border-top-color:#2563eb;border-radius:50%;animation:iduExam26Spin .85s linear infinite}
@keyframes iduExam26Spin{to{transform:rotate(360deg)}}
#iduExam26 .idu-exam26-group{border:1px solid #e2e8f0;border-radius:20px;overflow:hidden;background:#fff;box-shadow:0 8px 22px #0f172a0a;animation:iduExam26Enter .32s ease both}
@keyframes iduExam26Enter{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
#iduExam26 .idu-exam26-group-head{padding:14px 16px;display:flex;align-items:center;justify-content:space-between;gap:8px;border-bottom:1px solid #f1f5f9;background:linear-gradient(115deg,#f8fbff,#fff)}
#iduExam26 .idu-exam26-group-head h3{font-size:16px;line-height:1.35;margin:0;font-weight:900;color:#1e293b;min-width:0}
#iduExam26 .idu-exam26-group-head i{color:#2563eb;margin-right:6px}
#iduExam26 .idu-exam26-group-head span{flex-shrink:0;font-size:10px;color:#64748b;border-radius:99px;background:#f1f5f9;padding:5px 8px;font-weight:800}
#iduExam26 .idu-exam26-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;padding:12px}
#iduExam26 .idu-exam26-test{display:grid;grid-template-columns:40px minmax(0,1fr) 23px;align-items:center;gap:10px;min-height:82px;padding:10px 12px;text-align:left;border:1px solid #e2e8f0;border-radius:14px;background:#fff;transition:border-color .18s,transform .18s,background .18s,box-shadow .18s}
#iduExam26 .idu-exam26-test:hover{border-color:#93c5fd;background:#f8fbff;transform:translateY(-2px);box-shadow:0 8px 18px #2563eb10}
#iduExam26 .idu-exam26-test-icon{width:40px;height:40px;display:grid;place-items:center;border-radius:12px;background:#eff6ff;color:#2563eb;font-size:16px}
#iduExam26 .idu-exam26-test-name{display:block;font-size:13px;font-weight:900;color:#1e293b}
#iduExam26 .idu-exam26-test-meta{display:flex;flex-wrap:wrap;gap:5px;margin-top:6px;font-size:10px;color:#64748b}
#iduExam26 .idu-exam26-test-meta span{display:inline-flex;gap:4px;align-items:center;background:#f1f5f9;padding:4px 6px;border-radius:30px}
#iduExam26 .idu-exam26-test-arrow{color:#94a3b8}
#iduExam26 .idu-exam26-more-area{text-align:center;margin:15px 0 0}
#iduExam26 .idu-exam26-more{border:1px solid #bfdbfe;border-radius:12px;background:#eff6ff;color:#1d4ed8;font-size:12px;font-weight:900;padding:10px 16px}
#iduExam26 .idu-exam26-more[hidden]{display:none}
#iduExam26 .idu-exam26-seo{margin-top:26px;padding:18px 20px;border:1px solid #e2e8f0;border-radius:17px;background:#f8fafc}
#iduExam26 .idu-exam26-seo h2{font-size:19px;font-weight:900;margin:0 0 9px}
#iduExam26 .idu-exam26-seo h3{font-size:15px;margin:13px 0 7px}
#iduExam26 .idu-exam26-seo p{font-size:12.5px;line-height:1.8;color:#526179;margin:0 0 9px}
.idu-exam26-overlay .idu-exam26-toast{position:fixed;bottom:24px;left:50%;z-index:100003;padding:9px 14px;border-radius:50px;background:#0f172a;color:#fff;transform:translate(-50%,13px);opacity:0;pointer-events:none;transition:.2s;font-size:12px;font-weight:800}
.idu-exam26-overlay .idu-exam26-toast.is-show{opacity:1;transform:translate(-50%,0)}
/* Modal prefix là duy nhất; hoạt động cả khi chuyển popup ra body trên trình duyệt cũ */
.idu-exam26-overlay{position:fixed!important;inset:0!important;z-index:2147483647!important;max-width:none!important;max-height:none!important;width:100vw!important;height:100dvh!important;margin:0!important;padding:16px!important;border:0!important;box-sizing:border-box!important;overflow:hidden!important;background:rgba(2,6,23,.72)!important;backdrop-filter:blur(6px);display:none;align-items:center;justify-content:center}
.idu-exam26-overlay:popover-open,.idu-exam26-overlay.is-open{display:flex!important}
.idu-exam26-overlay::backdrop{background:rgba(2,6,23,.72)}
.idu-exam26-overlay *{box-sizing:border-box}
.idu-exam26-dialog{display:flex;flex-direction:column;width:min(1000px,100%);max-height:calc(100dvh - 32px);overflow:hidden;border-radius:22px;background:#f8fafc;border:1px solid #e2e8f0;box-shadow:0 25px 85px #0005;animation:iduExam26DialogIn .23s cubic-bezier(.18,.85,.2,1) both;color:#1e293b;font-family:inherit}
@keyframes iduExam26DialogIn{from{opacity:0;transform:translateY(10px) scale(.985)}to{opacity:1;transform:none}}
.idu-exam26-dialog-head{flex:0 0 auto;background:#fff;border-bottom:1px solid #e2e8f0;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:13px 16px}
.idu-exam26-dialog-heading{min-width:0}
.idu-exam26-dialog-heading h2{margin:0;color:#172554;font-size:clamp(17px,3vw,23px);line-height:1.28;font-weight:900}
.idu-exam26-dialog-heading p{margin:4px 0 0;color:#64748b;font-size:11px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.idu-exam26-close{width:38px;height:38px;flex:0 0 38px;border:1px solid #e2e8f0;border-radius:11px;background:#fff;color:#475569;cursor:pointer}
.idu-exam26-dialog-scroll{flex:1 1 auto;min-height:0;overflow:auto;overscroll-behavior:contain;padding:13px 16px 18px}
.idu-exam26-question{border:1px solid #e2e8f0;border-radius:15px;overflow:hidden;background:#fff;margin:0 0 12px}
.idu-exam26-question.is-correct{border-color:#86efac}.idu-exam26-question.is-wrong{border-color:#fca5a5}.idu-exam26-question.is-ungraded{border-color:#fde68a}
.idu-exam26-question-head{display:grid;grid-template-columns:33px minmax(0,1fr) auto;gap:9px;align-items:start;border-bottom:1px solid #f1f5f9;padding:13px}
.idu-exam26-q-number{display:grid;place-items:center;width:33px;height:33px;border-radius:10px;background:#eff6ff;color:#1d4ed8;font-size:11px;font-weight:900}
.idu-exam26-q-title{font-size:13.5px;line-height:1.75;font-weight:800;overflow-wrap:anywhere}
.idu-exam26-q-type{font-size:9px;font-weight:800;color:#64748b;background:#f1f5f9;border-radius:99px;padding:5px 7px;white-space:nowrap}
.idu-exam26-q-image{display:block;max-width:100%;max-height:500px;width:auto;height:auto;margin:10px auto;border-radius:11px}
.idu-exam26-options{display:grid;gap:8px;padding:12px 13px 14px}
.idu-exam26-option{display:grid;grid-template-columns:18px 26px minmax(0,1fr);align-items:start;gap:8px;border:1px solid #e2e8f0;padding:9px;border-radius:11px;cursor:pointer}
.idu-exam26-option:hover{background:#eff6ff;border-color:#bfdbfe}
.idu-exam26-option input{margin-top:5px;accent-color:#2563eb}
.idu-exam26-option-key{width:26px;height:26px;display:grid;place-items:center;border-radius:8px;background:#f1f5f9;font-weight:900;font-size:10px}
.idu-exam26-option-text{font-size:12.5px;line-height:1.65}
.idu-exam26-short{padding:13px}
.idu-exam26-short input{width:100%;min-height:42px;border:1px solid #cbd5e1;border-radius:11px;padding:9px 12px;color:#0f172a;background:#fff;font-size:13px}
.idu-exam26-tf{padding:12px 13px;overflow:auto}.idu-exam26-tf table{width:100%;border-collapse:collapse}.idu-exam26-tf th,.idu-exam26-tf td{border-bottom:1px solid #e2e8f0;padding:9px 8px;font-size:11.5px;text-align:left;vertical-align:top;line-height:1.5}.idu-exam26-tf th{background:#f8fafc;color:#64748b;font-size:10px}.idu-exam26-tf .idu-exam26-tf-choice{text-align:center;width:60px}.idu-exam26-tf input{accent-color:#2563eb}
.idu-exam26-feedback{display:none;border-top:1px solid #e2e8f0;padding:11px 13px;background:#f8fafc;font-size:12px;line-height:1.8}.idu-exam26-feedback.is-show{display:block}.idu-exam26-feedback b{color:#0f172a}.idu-exam26-correct{color:#15803d;font-weight:900}.idu-exam26-wrong{color:#b91c1c;font-weight:900}.idu-exam26-ungraded{color:#a16207;font-weight:900}
.idu-exam26-dialog-footer{flex:0 0 auto;display:flex;align-items:center;gap:10px;justify-content:space-between;flex-wrap:wrap;padding:11px 15px;border-top:1px solid #e2e8f0;background:#fff}
.idu-exam26-result{font-size:11px;line-height:1.5;color:#1d4ed8;font-weight:800;min-width:0}.idu-exam26-result:not(:empty){padding:9px 11px;background:#eff6ff;border-radius:10px;border:1px solid #dbeafe}
.idu-exam26-dialog-actions{display:flex;flex-wrap:wrap;gap:7px;margin-left:auto}
.idu-exam26-btn{min-height:40px;border:0;border-radius:10px;padding:8px 12px;font-size:11px;font-weight:850;display:inline-flex;align-items:center;justify-content:center;gap:6px;text-decoration:none;cursor:pointer}
.idu-exam26-btn-answer{background:#eff6ff;color:#1d4ed8;border:1px solid #bfdbfe}.idu-exam26-btn-reset{background:#f1f5f9;color:#475569}.idu-exam26-btn-submit{background:linear-gradient(120deg,#2563eb,#4f46e5);color:#fff!important}.idu-exam26-btn[hidden]{display:none!important}
@media(max-width:720px){#iduExam26 .idu-exam26-toolbar{padding:12px;flex-wrap:wrap}#iduExam26 .idu-exam26-select-wrap{width:100%;justify-content:space-between}#iduExam26 .idu-exam26-select-wrap select{flex:1}#iduExam26 .idu-exam26-grid{grid-template-columns:1fr}#iduExam26 .idu-exam26-group-head h3{font-size:14px}.idu-exam26-overlay{padding:0!important;align-items:stretch}.idu-exam26-dialog{width:100%;height:100dvh;max-height:100dvh;border:0;border-radius:0}.idu-exam26-dialog-scroll{padding:10px}.idu-exam26-dialog-head{padding:10px 12px}.idu-exam26-dialog-footer{padding:9px 11px}.idu-exam26-dialog-actions{width:100%}.idu-exam26-dialog-actions .idu-exam26-btn{flex:1}.idu-exam26-q-type{grid-column:2;justify-self:start}.idu-exam26-question-head{grid-template-columns:32px minmax(0,1fr)}}
@media(prefers-reduced-motion:reduce){#iduExam26 *,#iduExam26 *::before,#iduExam26 *::after,.idu-exam26-dialog{animation-duration:.01ms!important;transition-duration:.01ms!important}}

/* V3: Bố cục câu hỏi rõ ràng, cô lập khỏi CSS bài viết gốc của Blogger. */
.idu-exam26-overlay .idu-exam26-dialog{min-width:0;isolation:isolate}
.idu-exam26-overlay .idu-exam26-dialog-scroll{min-width:0;overflow-x:hidden}
.idu-exam26-overlay .idu-exam26-question{width:100%;min-width:0;margin:0 0 14px;border-radius:18px}
.idu-exam26-overlay .idu-exam26-question-head{display:grid;grid-template-columns:40px minmax(0,1fr) max-content;align-items:start;column-gap:13px;row-gap:5px;padding:15px 17px;background:linear-gradient(125deg,#f9fbff,#fff);min-width:0}
.idu-exam26-overlay .idu-exam26-q-number{width:40px;height:40px;border-radius:12px;font-size:12px;align-self:start}
.idu-exam26-overlay .idu-exam26-q-title{width:100%;min-width:0;max-width:none;margin:0;padding:3px 0;font-size:15px;line-height:1.75;font-weight:800;word-break:normal;overflow-wrap:break-word;white-space:normal;text-align:left}
.idu-exam26-overlay .idu-exam26-q-title mjx-container{max-width:100%;vertical-align:middle}
.idu-exam26-overlay .idu-exam26-q-title mjx-container[display="true"]{display:block;width:100%;max-width:100%;overflow-x:auto;overflow-y:hidden;text-align:left!important}
.idu-exam26-overlay .idu-exam26-q-type{grid-column:3;grid-row:1;justify-self:end;align-self:start;font-size:10px;line-height:1.3;padding:6px 10px;border-radius:999px}
.idu-exam26-overlay .idu-exam26-q-figure{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:0;max-width:100%;margin:12px 16px 4px;padding:8px;overflow:hidden;border:1px solid #e5eaf3;border-radius:13px;background:#fafcff}
.idu-exam26-overlay .idu-exam26-q-image{display:block;width:auto;max-width:100%!important;height:auto;max-height:min(540px,65vh);object-fit:contain;margin:0 auto!important;padding:0;border:0;border-radius:9px;box-shadow:none!important}
.idu-exam26-overlay .idu-exam26-q-figure.is-broken{min-height:48px;margin-top:9px;padding:10px 12px;border-style:dashed;background:#f8fafc}
.idu-exam26-overlay .idu-exam26-q-figure.is-broken .idu-exam26-q-image{display:none!important}
.idu-exam26-overlay .idu-exam26-q-image-fallback{display:none;align-items:center;justify-content:center;gap:8px;color:#64748b;font-size:11px;text-align:center;font-weight:700}
.idu-exam26-overlay .idu-exam26-q-figure.is-broken .idu-exam26-q-image-fallback{display:flex}
.idu-exam26-overlay .idu-exam26-options{padding:13px 16px 16px;gap:9px;min-width:0}
.idu-exam26-overlay .idu-exam26-option{display:grid;grid-template-columns:18px 29px minmax(0,1fr);align-items:center;gap:10px;min-width:0;width:100%;padding:11px 12px;border-radius:13px;line-height:1.5}
.idu-exam26-overlay .idu-exam26-option input{width:15px;height:15px;margin:0;align-self:center}
.idu-exam26-overlay .idu-exam26-option-key{width:29px;height:29px;border-radius:9px;font-size:11px}
.idu-exam26-overlay .idu-exam26-option-text{display:block;min-width:0;max-width:100%;font-size:13px;line-height:1.65;overflow-wrap:break-word;word-break:normal}
.idu-exam26-overlay .idu-exam26-option-text mjx-container{max-width:100%}
.idu-exam26-overlay .idu-exam26-short{padding:13px 16px 16px}
.idu-exam26-overlay .idu-exam26-short input{min-height:46px}
.idu-exam26-overlay .idu-exam26-tf{padding:13px 16px 16px}
.idu-exam26-overlay .idu-exam26-tf table{min-width:360px}
.idu-exam26-overlay .idu-exam26-tf-choice input{width:16px;height:16px}
.idu-exam26-overlay .idu-exam26-feedback{padding:13px 16px}
@media(max-width:640px){
 .idu-exam26-overlay .idu-exam26-question-head{grid-template-columns:36px minmax(0,1fr);column-gap:10px;row-gap:4px;padding:12px}
 .idu-exam26-overlay .idu-exam26-q-number{width:36px;height:36px}
 .idu-exam26-overlay .idu-exam26-q-title{font-size:13.5px;line-height:1.68;padding:2px 0}
 .idu-exam26-overlay .idu-exam26-q-type{grid-column:2;grid-row:2;justify-self:start;font-size:9px;padding:4px 7px}
 .idu-exam26-overlay .idu-exam26-q-figure{margin:10px 11px 2px}
 .idu-exam26-overlay .idu-exam26-options{padding:11px 10px 12px;gap:8px}
 .idu-exam26-overlay .idu-exam26-option{grid-template-columns:17px 27px minmax(0,1fr);padding:10px 9px;gap:8px}
 .idu-exam26-overlay .idu-exam26-option-key{width:27px;height:27px}
 .idu-exam26-overlay .idu-exam26-option-text{font-size:12.5px}
 .idu-exam26-overlay .idu-exam26-short,.idu-exam26-overlay .idu-exam26-tf{padding:11px}
}

/* V4: Chieu ngang va cong thuc latex inline trong tieu de cau hoi */
.idu-exam26-overlay .idu-exam26-q-title mjx-container:not([display="true"]){
  display:inline-block!important;width:auto!important;max-width:none!important;
  margin:0 .08em!important;vertical-align:-.15em;white-space:nowrap;
}
.idu-exam26-overlay .idu-exam26-q-title .MathJax,
.idu-exam26-overlay .idu-exam26-q-title .MathJax_SVG{
  display:inline-block!important;width:auto!important;vertical-align:middle!important;
}