/* Trang giới thiệu kỳ thi /gioi-thieu/<kỳ-thi>/ — do tools/gioithieu.py sinh HTML.
   Màu nhấn của từng kỳ thi đi qua biến --gtc đặt trên .gt. */
.gt{--gtc:var(--pink)}
.gt > .wrap{padding-bottom:10px}
/* ===== ĐẦU TRANG (6/10/2026 đợt 2): nền navy tràn ngang, trái là lời giới thiệu,
   phải là FORM TƯ VẤN — thứ đầu tiên khách thấy mà không phải cuộn. ===== */
.gt-dau{background:linear-gradient(135deg,#13264a 0%,#1c355f 55%,color-mix(in srgb,var(--gtc) 55%,#1c355f) 130%);color:#fff}
.gt-dau-in{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(320px,.8fr);gap:34px;align-items:center;
  padding-top:34px;padding-bottom:38px}
.gt-hero .crumb{padding:0 0 10px;color:#c9d4ea}
.gt-hero .crumb a{color:#c9d4ea}
.gt-hero h1{color:#fff;font-size:34px;line-height:1.22;margin:0 0 12px;letter-spacing:-.2px}
.gt-lead{font-size:16.5px;line-height:1.7;color:#dde5f5;max-width:640px;margin:0}
.gt-facts{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 0;padding:0;list-style:none}
.gt-facts li{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);border-radius:999px;
  padding:6px 14px;font-size:14px;font-weight:650;color:#fff}
.gt-cta{display:flex;flex-wrap:wrap;gap:10px;margin:20px 0 4px}
.gt-cta .btn{padding:11px 20px;font-size:15px}
.gt-dau .gt-cta .btn.ghost{background:transparent;border-color:rgba(255,255,255,.55);color:#fff}
.gt-dau .gt-cta .btn.ghost:hover{background:rgba(255,255,255,.12);border-color:#fff;color:#fff}
.gt-cta .btn.ghost{border-color:var(--navy);color:var(--navy);background:#fff}
.gt-cta .btn.ghost:hover{border-color:var(--pink);color:var(--pink)}
.gt-tin{margin:16px 0 0;font-size:13.5px;line-height:1.6;color:#c9d4ea;max-width:620px}
.gt-tin b{color:#fff}
/* Form tư vấn */
#tu-van{scroll-margin-top:80px}
.gt-form{background:#fff;color:var(--txt);border-radius:18px;padding:22px 22px 18px;box-shadow:0 18px 50px rgba(8,20,48,.35)}
.gt-form-td{font-size:19px;font-weight:800;color:var(--navy);line-height:1.3}
.gt-form-mo{margin:6px 0 12px;font-size:14px;color:var(--muted);line-height:1.55}
.gt-form label{display:block;font-size:13px;font-weight:700;color:var(--navy);margin:10px 0 0}
.gt-form input,.gt-form select{display:block;width:100%;box-sizing:border-box;margin:5px 0 0;padding:11px 12px;
  border:1px solid #d5dbe8;border-radius:10px;font:inherit;font-size:15px;font-weight:500;background:#fff;color:var(--txt)}
.gt-form input:focus,.gt-form select:focus{outline:2px solid color-mix(in srgb,var(--gtc) 45%,#fff);border-color:var(--gtc)}
.gt-form-2{display:grid;grid-template-columns:1.4fr 1fr;gap:10px}
.gt-form .btn{width:100%;margin-top:16px;padding:13px 16px;font-size:16px;justify-content:center;text-align:center}
.gt-form-loi{margin:10px 0 0;font-size:13.5px;font-weight:650;color:#b91c1c}
.gt-form-nho{margin:10px 0 0;font-size:12.5px;color:var(--muted);line-height:1.5;text-align:center}
.gt-form-ok{text-align:center;padding:26px 6px}
.gt-form-ok b{display:block;font-size:20px;color:var(--navy);margin:8px 0 6px}
.gt-form-ok p{margin:0 0 14px;font-size:14.5px;color:var(--muted);line-height:1.6}
/* Mục lục dính */
.gt-muc{position:sticky;top:53px;z-index:60;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 1px 0 rgba(20,40,80,.04)}
.gt-muc .wrap{display:flex;gap:6px;overflow-x:auto;padding-top:8px;padding-bottom:8px;scrollbar-width:none;align-items:center}
.gt-muc a{flex:0 0 auto;padding:6px 13px;border-radius:999px;font-size:14px;font-weight:600;color:var(--navy);
  text-decoration:none;background:#f4f6fb}
.gt-muc a:hover{background:var(--gtc);color:#fff}
.gt-muc a.gt-muc-cta{margin-left:auto;background:var(--pink);color:#fff}
.gt-khoi{margin:38px 0 0;scroll-margin-top:120px}
.gt-khoi h2{color:var(--navy);font-size:22px;margin:0 0 6px;padding-left:12px;border-left:4px solid var(--gtc)}
.gt-h3{color:var(--navy);font-size:16px;margin:20px 0 8px}
.gt-chu{color:var(--muted);font-size:14.5px;line-height:1.65;margin:0 0 12px;max-width:860px}
.gt-them{margin:12px 0 0;font-size:14.5px}
/* Bảng "cần biết gì" */
.gt-dl{margin:10px 0 0;border:1px solid var(--line);border-radius:14px;background:#fff;overflow:hidden}
.gt-dl > div{display:grid;grid-template-columns:150px 1fr;gap:14px;padding:12px 16px;border-top:1px solid var(--line)}
.gt-dl > div:first-child{border-top:0}
.gt-dl dt{font-weight:750;color:var(--navy);font-size:14.5px}
.gt-dl dd{margin:0;font-size:14.5px;line-height:1.65;color:var(--txt)}
/* Giáo viên */
.gt-gvl{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.gt-gv{display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 15px;min-width:0}
.gt-gv img{flex:0 0 72px;width:72px;height:72px;border-radius:50%;object-fit:cover;object-position:top;border:2px solid #eef2f8;background:#f5f7fb}
.gt-gv-ten{font-weight:800;color:var(--navy);font-size:16px;line-height:1.2}
.gt-gv-vai{font-size:13.5px;font-weight:700;color:var(--gtc);margin:3px 0 5px;line-height:1.35}
.gt-gv-day{display:inline-block;margin:0 0 6px;font-size:12.5px;font-weight:700;color:var(--navy);
  background:#f4f6fb;border-radius:999px;padding:2px 10px}
.gt-gv p{margin:0;font-size:13.5px;color:var(--muted);line-height:1.55}
.gt-gvn{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.gt-gvn1{display:flex;gap:10px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 12px;min-width:0}
.gt-gvn1 img{flex:0 0 40px;width:40px;height:40px;border-radius:50%;object-fit:cover;object-position:top}
.gt-gvn1 b{display:block;color:var(--navy);font-size:14.5px}
.gt-gvn1 span{display:inline-block;margin-top:3px;font-size:12.5px;font-weight:700;color:var(--gtc);
  background:color-mix(in srgb,var(--gtc) 10%,#fff);border-radius:999px;padding:2px 9px}
.gt-gvn1 p{margin:4px 0 0;font-size:12.5px;color:var(--muted);line-height:1.45}
/* Level học */
.gt-ht{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:10px;margin:0 0 14px}
.gt-ht > div{background:color-mix(in srgb,var(--gtc) 6%,#fff);border:1px solid color-mix(in srgb,var(--gtc) 22%,#fff);
  border-radius:12px;padding:11px 14px}
.gt-ht b{display:block;color:var(--navy);font-size:14.5px}
.gt-ht span{display:block;margin-top:3px;font-size:13px;color:var(--muted);line-height:1.5}
.gt-lvl{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:12px;align-items:start}
.gt-lv{background:#fff;border:1px solid var(--line);border-radius:14px;padding:4px 16px 8px}
.gt-lv h3{font-size:12.5px;letter-spacing:.7px;text-transform:uppercase;color:var(--muted);margin:12px 0 2px}
.gt-lv ul{list-style:none;margin:0;padding:0}
.gt-lv li{padding:10px 0;border-top:1px solid var(--line);font-size:14px;line-height:1.5}
.gt-lv li:first-child{border-top:0}
.gt-lv li b{display:block;color:var(--navy);font-size:15px}
.gt-lv li span{display:block;color:var(--txt)}
.gt-lv li i{display:inline-block;margin-top:4px;font-style:normal;font-size:12px;font-weight:650;color:var(--muted);
  background:#f4f6fb;border-radius:999px;padding:1px 9px}
.gt-lv li a{display:inline-block;margin-top:3px;font-size:13px;font-weight:650}
/* Kèm 1-1 */
.gt-buoc{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:8px}
.gt-buoc li{display:flex;gap:9px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:12px;
  padding:10px 12px;font-size:14px;font-weight:600;color:var(--navy);line-height:1.35}
.gt-buoc li i{flex:0 0 26px;height:26px;border-radius:50%;background:var(--gtc);color:#fff;font-style:normal;
  font-weight:800;font-size:13px;display:flex;align-items:center;justify-content:center}
/* Kết quả học viên */
.gt-anh{display:flex;gap:12px;overflow-x:auto;padding:4px 0 10px;scroll-snap-type:x proximity}
.gt-a1{flex:0 0 190px;scroll-snap-align:start;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff;
  text-decoration:none;display:flex;flex-direction:column}
.gt-a1.rong{flex-basis:320px}
.gt-a1 img{width:100%;height:230px;object-fit:cover;object-position:top;display:block;background:#f5f7fb}
.gt-a1 span{padding:7px 10px;font-size:13px;font-weight:750;color:var(--navy);text-align:center}
.gt-diem{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin-top:8px}
.gt-diem > div{background:#fff;border:1px solid var(--line);border-radius:12px;padding:12px;text-align:center}
.gt-diem b{display:block;font-size:26px;color:var(--gtc);line-height:1.1}
.gt-diem span{display:block;font-weight:700;color:var(--navy);font-size:14px;margin-top:4px}
.gt-diem i{font-style:normal;font-size:12.5px;color:var(--muted)}
.gt-loi{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:10px;margin-top:10px}
.gt-loi blockquote{margin:0;background:#fff;border:1px solid var(--line);border-left:4px solid var(--gtc);border-radius:12px;padding:12px 14px}
.gt-loi p{margin:0 0 6px;font-size:14.5px;line-height:1.55;color:var(--txt)}
.gt-loi footer{font-size:13px;color:var(--muted)}
.gt-loi footer b{color:var(--navy)}
.gt-vid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px;margin-top:12px}
.gt-vid a{border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff;text-decoration:none}
.gt-vid img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block}
.gt-vid span{display:block;padding:8px 12px;font-size:14px;font-weight:650;color:var(--navy)}
/* Bài viết */
.gt-bl{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:12px}
.gt-bai{display:block;background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 15px;text-decoration:none}
.gt-bai:hover{border-color:var(--gtc)}
.gt-bai span{font-size:11.5px;font-weight:800;letter-spacing:.6px;text-transform:uppercase;color:var(--gtc)}
.gt-bai b{display:block;margin:4px 0 6px;color:var(--navy);font-size:15.5px;line-height:1.35}
.gt-bai p{margin:0;font-size:13.5px;color:var(--muted);line-height:1.55;display:-webkit-box;-webkit-line-clamp:3;
  -webkit-box-orient:vertical;overflow:hidden}
.gt-cuoi{background:linear-gradient(135deg,#13264a,#1c355f);color:#fff;border-radius:18px;padding:24px 26px;
  display:flex;flex-wrap:wrap;gap:16px 28px;align-items:center;justify-content:space-between}
.gt-cuoi h2{color:#fff;border:0;padding:0;margin:0 0 6px}
.gt-cuoi p{margin:0;color:#dde5f5;font-size:15px;line-height:1.6;max-width:560px}
.gt-cuoi .gt-cta{margin:0}
.gt-cuoi .gt-cta .btn.ghost{background:transparent;border-color:rgba(255,255,255,.55);color:#fff}
/* ===== MÔN HỌC · SYLLABUS · RUBRIC ===== */
.gt-h3 small{font-weight:600;color:var(--muted);font-size:13px;margin-left:6px}
.gt-mon{background:#fff;border:1px solid var(--line);border-radius:12px;margin:8px 0 0;overflow:hidden}
.gt-mon[open]{border-color:var(--gtc);box-shadow:0 6px 22px rgba(20,40,80,.08)}
.gt-mon summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:10px;padding:13px 16px;flex-wrap:wrap}
.gt-mon summary::-webkit-details-marker{display:none}
.gt-mon summary::after{content:"";margin-left:auto;width:8px;height:8px;border-right:2px solid var(--navy);
  border-bottom:2px solid var(--navy);transform:rotate(45deg);opacity:.55;transition:transform .15s;flex:0 0 auto}
.gt-mon[open] summary::after{transform:rotate(-135deg)}
.gt-mon summary b{color:var(--navy);font-size:15.5px}
.gt-mon summary span{color:var(--muted);font-size:13.5px}
.gt-nhan{font-style:normal;font-size:11.5px;font-weight:800;color:#fff;background:var(--gtc);border-radius:999px;padding:2px 9px}
.gt-mon-than{padding:2px 16px 16px;border-top:1px solid var(--line)}
.gt-mon-than h4,.gt-tc h4{font-size:12.5px;letter-spacing:.7px;text-transform:uppercase;color:var(--muted);margin:16px 0 6px}
.gt-tb{width:100%;border-collapse:collapse;font-size:14px;line-height:1.55}
.gt-tb th{text-align:left;vertical-align:top;width:34%;padding:8px 12px 8px 0;color:var(--navy);font-weight:700;border-top:1px solid var(--line)}
.gt-tb th small{display:block;font-weight:600;color:var(--gtc);font-size:12.5px;margin-top:2px}
.gt-tb td{vertical-align:top;padding:8px 0;border-top:1px solid var(--line);color:var(--txt)}
.gt-tb tr:first-child th,.gt-tb tr:first-child td{border-top:0}
.gt-tb-lon{background:#fff;border:1px solid var(--line);border-radius:14px;border-collapse:separate;border-spacing:0;overflow:hidden}
.gt-tb-lon th{padding-left:16px}.gt-tb-lon td{padding-right:16px}
.gt-unit{margin:0;padding:0;list-style:none;counter-reset:u;display:grid;grid-template-columns:1fr 1fr;gap:4px 18px}
.gt-unit li{counter-increment:u;display:flex;gap:8px;align-items:baseline;font-size:14px;line-height:1.45;padding:4px 0;border-bottom:1px dashed var(--line)}
.gt-unit li::before{content:counter(u);flex:0 0 20px;font-weight:800;color:var(--gtc);font-size:12.5px}
.gt-unit li b{margin-left:auto;flex:0 0 auto;font-size:12.5px;color:var(--navy);background:#f4f6fb;border-radius:999px;padding:1px 8px}
.gt-rb{margin:0;padding-left:18px;font-size:14px;line-height:1.6;color:var(--txt)}
.gt-rb li{margin:3px 0}
.gt-nho{font-size:13px;color:var(--muted);margin:8px 0 0;line-height:1.5}
.gt-nguon{font-size:12.5px;color:var(--muted);margin:12px 0 0;font-style:italic}
.gt-mon-nut{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.gt-mon-nut .btn{padding:8px 14px;font-size:13.5px}
.gt-mon-nut .btn.ghost{border-color:var(--navy);color:var(--navy);background:#fff}
.gt-tcl{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:12px;margin-top:12px}
.gt-tc{background:#fff;border:1px solid var(--line);border-radius:14px;padding:2px 16px 14px}
/* Nút nổi trên điện thoại */
.gt-noi{display:none}
@media(max-width:900px){
  .gt-dau-in{grid-template-columns:1fr;gap:22px;padding-top:22px;padding-bottom:26px}
  .gt-muc{top:0}
  .gt-muc a.gt-muc-cta{display:none}
  .gt-noi{display:block;position:fixed;left:12px;right:12px;bottom:12px;z-index:80;text-align:center;background:var(--pink);
    color:#fff;font-weight:800;font-size:15.5px;padding:13px;border-radius:14px;text-decoration:none;box-shadow:0 10px 30px rgba(20,40,80,.3)}
  .gt-noi.an{display:none}
  .site-foot{padding-bottom:80px}
}
@media(max-width:720px){
  .gt-hero h1{font-size:25px}
  .gt-unit{grid-template-columns:1fr}
  .gt-tb th{width:40%}
  .gt-form-2{grid-template-columns:1fr}
  .gt-cuoi{padding:20px 18px}
  .gt-gvl,.gt-gvn{grid-template-columns:1fr}
  .gt-dl > div{grid-template-columns:1fr;gap:3px}
  .gt-lvl{grid-template-columns:1fr}
  .gt-a1{flex-basis:160px}.gt-a1.rong{flex-basis:260px}.gt-a1 img{height:200px}
}