@import url("/app/sat8020/sat.css?v=20260824f");

body.ky-ap      { --acc:#B23A1E; --acc-lite:#E4633F; --acc-soft:#FDF0EB; }
body.ky-ib      { --acc:#1D6F5C; --acc-lite:#2FA184; --acc-soft:#EAF7F2; }
body.ky-alevel  { --acc:#6B2D8A; --acc-lite:#9B58BC; --acc-soft:#F6EEFA; }
body.ky-igcse   { --acc:#8A5A00; --acc-lite:#C08A1E; --acc-soft:#FBF3E3; }
body.ky-cam-pri { --acc:#4338CA; --acc-lite:#6D62E0; --acc-soft:#EFEDFC; }
body.ky-cam-low { --acc:#1B7F79; --acc-lite:#2FA9A1; --acc-soft:#E8F6F5; }
body.ky-ged     { --acc:#0E6EA0; --acc-lite:#2EA5D6; --acc-soft:#EAF6FD; }
body.ky-ssat    { --acc:#A32357; --acc-lite:#D4548A; --acc-soft:#FCEDF3; }
body.ky-tdn     { --acc:#B0186A; --acc-lite:#E0489B; --acc-soft:#FDEDF5; }

.site-logo span { max-width:280px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }

.katex-display { overflow-x:auto; overflow-y:hidden; padding:2px 0; }
.katex { font-size:1.04em; }
.q-opts .katex-display { margin:4px 0; }

.mon-luoi { display:grid; grid-template-columns:repeat(auto-fill,minmax(250px,1fr));
  gap:14px; margin-top:18px; }
.mon-o { display:block; background:var(--card); border:1px solid var(--line);
  border-radius:var(--radius); padding:16px 18px; text-decoration:none; color:inherit;
  transition:border-color .12s, transform .12s; }
.mon-o:hover { border-color:var(--acc-lite); transform:translateY(-1px); }
.mon-o b { display:block; color:var(--navy); font-size:15.5px; }
.mon-o .so { margin-top:7px; font-size:12.5px; color:var(--muted); }
.mon-o .so i { font-style:normal; color:var(--acc); font-weight:700; }
.mon-o.trong { opacity:.55; }
.mon-o.trong .so { color:var(--warn); }

.gan-day { display:flex; align-items:center; gap:10px; background:#fff;
  border:1px solid var(--line); border-radius:var(--radius); padding:9px 13px;
  font-size:13.5px; }
.gan-day > b { color:var(--acc); flex:none; }
.gan-day > span:not(.pill) { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.gan-day > .pill { margin-left:auto; flex:none; }

.tl-ds { margin-top:16px; display:flex; flex-direction:column; gap:10px; }
.tl-nhom { display:flex; align-items:baseline; gap:10px; flex-wrap:wrap;
  margin:26px 0 0; color:var(--navy); font-size:17px; }
.tl-nhom:first-child { margin-top:6px; }
.tl-nhom .tl-dem { font-size:12.5px; font-weight:700; color:var(--acc);
  background:var(--acc-soft); border-radius:999px; padding:2px 9px; }
.tl-hang { display:flex; flex-direction:row; align-items:center; gap:14px; flex-wrap:wrap;
  background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:14px 16px; transition:border-color .12s; }
.tl-hang:hover { border-color:var(--acc-lite); }
.tl-hang .tl-ic { flex:none; color:var(--acc); display:flex; }
.tl-hang .tl-nd { flex:1 1 240px; min-width:0; }
.tl-hang .tl-nd b { display:block; color:var(--navy); font-size:15px; }
.tl-hang .tl-nd p { margin-top:3px; font-size:13px; color:var(--muted); }
.tl-hang .tl-tai { flex:none; display:inline-flex; align-items:center; gap:7px; }

.tl-hang .tl-bia { flex:none; width:172px; height:104px; padding:0; cursor:zoom-in;
  border:1px solid var(--line-2); border-radius:6px; overflow:hidden; background:#fff;
  display:block; transition:border-color .12s, transform .12s; }
.tl-hang .tl-bia img { width:100%; height:100%; object-fit:cover; object-position:center;
  display:block; }
.tl-hang .tl-bia:hover { border-color:var(--acc); transform:translateY(-1px); }
.tl-hang .tl-xem-nhac { display:inline-block; margin-top:5px; font-size:12.5px;
  font-weight:700; color:var(--acc); cursor:zoom-in; }
.tl-hang .tl-xem-nhac:hover { text-decoration:underline; }

.tl-lop-xem { position:fixed; inset:0; z-index:9996; background:rgba(16,24,40,.72);
  display:flex; align-items:center; justify-content:center; padding:20px; }
.tl-lop-xem .tl-khung { background:var(--card); border-radius:var(--radius);
  max-width:900px; width:100%; max-height:100%; display:flex; flex-direction:column;
  overflow:hidden; box-shadow:0 24px 60px rgba(16,24,40,.35); }
.tl-lop-xem .tl-khung-dau, .tl-lop-xem .tl-khung-chan {
  display:flex; align-items:center; gap:12px; padding:12px 16px; flex:none; }
.tl-lop-xem .tl-khung-dau { border-bottom:1px solid var(--line); }
.tl-lop-xem .tl-khung-dau b { color:var(--navy); font-size:15px; flex:1; min-width:0; }
.tl-lop-xem .tl-dong { flex:none; border:0; background:transparent; cursor:pointer;
  font-size:17px; line-height:1; color:var(--muted); padding:4px 6px; }
.tl-lop-xem .tl-dong:hover { color:var(--navy); }
.tl-lop-xem .tl-khung img { flex:1; min-height:0; width:100%; object-fit:contain;
  overflow:auto; background:#fff; }
.tl-lop-xem .tl-khung-chan { border-top:1px solid var(--line); justify-content:space-between; }
.tl-lop-xem .tl-khung-chan .muted { font-size:13px; }

@media (max-width:560px) {
  .tl-hang { align-items:flex-start; }
  .tl-hang .tl-bia { order:-1; width:100%; height:auto; aspect-ratio:172/104; }
  .tl-hang .tl-tai { width:100%; justify-content:center; }
  .tl-lop-xem { padding:12px; }
  .tl-lop-xem .tl-khung-chan { flex-direction:column; align-items:stretch; gap:8px; }
}


.goi-luoi { display:grid; grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  gap:14px; margin-top:18px; }
.goi-luoi > .goi { position:relative; background:var(--card); border:1px solid var(--line);
  border-radius:var(--radius); padding:20px 18px; text-align:center; display:block; }
.goi-luoi > .goi.hay { border-color:var(--acc); border-width:2px; background:var(--card); }
.goi-luoi > .goi .tem { position:absolute; top:-10px; left:50%; transform:translateX(-50%);
  background:var(--acc); color:#fff; font-size:11px; font-weight:800;
  letter-spacing:.4px; padding:3px 10px; border-radius:3px; white-space:nowrap; }
.goi-luoi > .goi h3 { color:var(--navy); font-size:16px; }
.goi-luoi > .goi .gia { font-size:26px; font-weight:800; color:var(--acc); margin:8px 0 4px;
  display:block; font-variant-numeric:tabular-nums; }
.goi-luoi > .goi .mo { font-size:13px; color:var(--muted); min-height:38px; margin-bottom:12px; }
.goi-luoi > .goi .btn { width:100%; }

.goi-grid { justify-content:start; }
.goi-grid > .goi { min-width:0; }
.goi-grid:has(> .goi:only-child) { grid-template-columns:minmax(260px,340px); }

.pro-tin { display:flex; flex-wrap:wrap; gap:8px 18px; margin-top:16px;
  font-size:13px; color:var(--muted); }
.pro-tin span { display:inline-flex; align-items:center; gap:6px; }
.pro-tin b { color:var(--text); font-weight:700; }

.pro-mo { display:grid; grid-template-columns:repeat(auto-fit,minmax(210px,1fr));
  gap:10px; margin-top:14px; }
.pro-mo div { background:var(--acc-soft); border-radius:var(--radius);
  padding:11px 13px; font-size:13.5px; color:var(--text); line-height:1.5; }
.pro-mo b { color:var(--navy); }

.pro-dk { margin-top:16px; font-size:13px; color:var(--muted); }
.pro-dk summary { cursor:pointer; font-weight:700; color:var(--navy); }
.pro-dk p { margin:8px 0 0; }

.dang-khoi { margin-top:26px; }
.dang-khoi > h3 { color:var(--navy); font-size:16.5px; display:flex; align-items:baseline; gap:10px; }
.dang-khoi > h3 span { font-size:12.5px; color:var(--muted); font-weight:400; }

.bang-de { width:100%; border-collapse:collapse; background:var(--card);
  border:1px solid var(--line); margin-top:10px; font-size:14px; }
.bang-de th { text-align:left; font-size:11px; letter-spacing:.6px; text-transform:uppercase;
  color:var(--muted); font-weight:700; padding:9px 14px;
  border-bottom:1px solid var(--line-2); background:#F8FAFC; white-space:nowrap; }
.bang-de td { padding:11px 14px; border-bottom:1px solid var(--line); vertical-align:middle; }
.bang-de tr:last-child td { border-bottom:0; }
.bang-de tbody tr:hover { background:var(--acc-soft); }
.bang-de .so { text-align:right; white-space:nowrap; color:var(--muted);
  font-variant-numeric:tabular-nums; font-size:13px; }
.bang-de thead th:not(:first-child) { text-align:right; }
.bang-de thead th:last-child { width:1%; }
.bang-de .ten { font-weight:600; color:var(--navy); }
.bang-de .ten a { color:inherit; text-decoration:none; }
.bang-de .ten a:hover { text-decoration:underline; }
.bang-de .ten .mo { display:block; font-weight:400; font-size:12.5px;
  color:var(--muted); margin-top:2px; max-width:46em; }
@media (max-width:620px){
  body.ky-khac .bang-de th:nth-child(2), body.ky-khac .bang-de td:nth-child(2),
  body.ky-khac .bang-de th:nth-child(3), body.ky-khac .bang-de td:nth-child(3),
  body.ky-khac .bang-de th:nth-child(4), body.ky-khac .bang-de td:nth-child(4){ display:none }
  body.ky-khac .bang-de .di{ vertical-align:top; padding-top:13px }
}
.bang-de .di { text-align:right; white-space:nowrap; width:1%; }
.bang-de .di a { color:var(--acc); font-weight:700; text-decoration:none; font-size:13px; }
.bang-de .di a:hover { text-decoration:underline; }
.bang-de tr.xong td { background:#F7FBF8; }
.bang-de tr.xong .ten { color:#065F46; }

.bang-de tr.nhom td { background:#EEF2F7; padding:9px 14px; border-bottom:1px solid var(--line-2);
  scroll-margin-top:120px; }
.bang-de tr.nhom:hover td { background:#EEF2F7; }
.bang-de tr.nhom b { color:var(--navy); font-size:14px; }
.bang-de tr.nhom span { color:var(--muted); font-size:12.5px; margin-left:10px; }

.bang-cuon { overflow-x:auto; }

.thi-mo { background:linear-gradient(135deg,var(--acc-soft),#F7FAFD 60%,#fff);
  border:1px solid var(--line-2); border-radius:var(--radius); padding:22px 24px; margin-top:18px; }
.thi-mo h2 { color:var(--navy); font-size:20px; }
.thi-mo .luat-thi { margin:12px 0 16px; font-size:13.5px; color:var(--muted); }
.thi-mo .luat-thi li { margin:3px 0; }

.it-de { background:var(--warnbg); border:1px solid #F5D9AE; border-radius:var(--radius);
  padding:12px 15px; font-size:13.5px; color:var(--warn); margin-top:16px; }

@media (max-width:640px) {
  .mon-luoi, .bo-luoi { grid-template-columns:1fr; }

  .site-header .top-row { gap:10px; }
  .site-logo { min-width:0; flex:1 1 auto; overflow:hidden; }
  .site-logo span { min-width:0; max-width:100%; font-size:13.5px; }
  .site-logo img { height:28px; width:57px; flex:none; object-fit:contain; }
  .header-cta { flex:none; }
  .header-cta .btn, .cta-stack .btn { max-width:none; font-size:12px; padding:6px 10px; }

  body.ky-tdn .site-logo span { display:none; }

  .ls-table { display:block; overflow-x:auto; }

  .lt-hero > div[style*="flex:none"] { flex:0 1 auto !important; min-width:0; max-width:100%; }
  .lt-hero .btn { white-space:normal; overflow-wrap:anywhere; }
  .bang-de th, .bang-de td { padding:8px 9px; font-size:12.5px; overflow-wrap:anywhere; }
  .site-header .top-row { min-width:0; }
  .header-cta { min-width:0; flex:0 1 auto; }
  #khungPinyin { font-size:11.5px; padding:5px 8px; flex:0 1 auto; min-width:0; }
}

.nav-item.nav-tailieu { border-right:0; border-left:1px solid #DCE3ED; }
.main-nav .nav-item.nav-tailieu > a {
  background:var(--acc); color:#fff; border-bottom-color:var(--acc); }
.main-nav .nav-item.nav-tailieu > a:hover { background:var(--acc-lite); color:#fff; }
.main-nav .nav-item.nav-tailieu > a.active {
  background:#fff; color:var(--acc); border-bottom-color:var(--acc); }
.main-nav .nav-item.nav-tailieu > a.active:hover { background:#fff; }
.main-nav .nav-item.nav-tailieu > a svg { flex:none; }

@media (max-width:760px) {
  .nav-item.nav-tailieu { position:sticky; right:0; z-index:5;
    box-shadow:-8px 0 12px -6px rgba(16,24,40,.25); }
  .site-header .top-row { height:auto; min-height:58px; padding:6px 0; }
  .nav-tailieu .tl-dai { display:none; }
}

.mock-bang { width:100%; border-collapse:collapse; margin:10px 0 4px; font-size:13.5px; }
.mock-bang th { text-align:left; font-size:11px; letter-spacing:.5px; text-transform:uppercase;
  color:var(--muted); padding:7px 10px; border-bottom:2px solid var(--line-2); }
.mock-bang td { padding:8px 10px; border-bottom:1px solid var(--line); }
.mock-lan { display:flex; gap:14px; align-items:center; justify-content:space-between;
  background:#fff; border:1px solid var(--line); border-radius:8px; padding:9px 13px;
  margin-top:8px; font-size:13.5px; }
.mock-lan a { color:var(--acc); font-weight:700; text-decoration:none; }
.mock-frq { width:100%; font:inherit; font-size:14.5px; line-height:1.55; padding:12px;
  border:1px solid var(--line-2); border-radius:8px; margin-top:14px; resize:vertical; }
.mock-frq:focus { outline:2px solid var(--acc-lite); border-color:transparent; }
.mock-kq .mock-diem { display:flex; align-items:baseline; gap:12px; margin:10px 0 18px; }
.mock-kq .mock-diem .to { font-size:52px; font-weight:800; color:var(--acc); line-height:1; }
.mock-kq .mock-diem .thang { color:var(--muted); font-size:14px; }
.mock-sec { padding:9px 0; border-bottom:1px solid var(--line); }
.mock-sec-top { display:flex; align-items:center; justify-content:space-between; font-size:14px; }
.mock-sec-top span { color:var(--muted); font-weight:700; font-size:13px; }
.mock-sec-bar { height:6px; border-radius:3px; background:#EEF1F5; overflow:hidden; margin-top:6px; }
.mock-sec-bar span { display:block; height:100%; background:var(--acc); border-radius:3px; }
.mock-frq-kq { background:#fff; border:1px solid var(--line); border-radius:8px;
  padding:12px 14px; margin-top:12px; font-size:13.5px; }
.mock-frq-kq .mock-sec-bar { margin-top:8px; margin-bottom:2px; }
.mock-frq-kq .tc { margin-top:6px; color:var(--muted); }
.mock-frq-kq .tc span { color:var(--navy); font-weight:600; }
.mock-frq-kq .nx { margin-top:8px; padding-top:8px; border-top:1px dashed var(--line); }

.cb-the { max-width:340px; margin:22px auto 8px; background:#fff; border:1px solid #E2E6EB;
  border-radius:10px; overflow:hidden; text-align:center;
  box-shadow:0 12px 30px rgba(15,40,70,.13); }
.cb-the-dau { position:relative; height:84px; background:#3D7FA6; display:flex;
  align-items:center; justify-content:center; }
.cb-the-dau > svg { position:absolute; top:0; left:0; width:100%; height:100%; }
.cb-the-dau b { position:relative; color:#fff; font-size:16.5px; font-weight:600;
  letter-spacing:.2px; }
.cb-the-than { padding:24px 24px 22px; }
.cb-the-vong { width:186px; max-width:100%; margin:0 auto; display:block; }
.cb-the-nha { width:232px; max-width:100%; margin:10px auto 0; display:block; }
.cb-the-loi { margin:14px auto 0; max-width:252px; color:#1E1E1E; font-size:14.5px;
  line-height:1.45; }
.cb-the-nut { display:inline-block; margin-top:16px; padding:9px 24px; background:#fff;
  border:1.6px solid #1E1E1E; border-radius:999px; color:#1E1E1E; font-weight:700;
  font-size:14px; text-decoration:none; }
.cb-the-nut:hover { background:#F3F6F8; }
.cb-the-ve { display:block; margin-top:13px; color:#1E1E1E; font-size:13.5px;
  text-decoration:underline; }
.cb-the-chuthich { max-width:360px; margin:10px auto 20px; text-align:center;
  font-size:12.5px; color:var(--muted); }

.bh-dau { background:linear-gradient(135deg,var(--acc-soft),#F7FAFD 60%,#fff);
  border:1px solid var(--line-2); border-radius:var(--radius); padding:20px 22px; margin-top:16px; }
.bh-dau h1 { color:var(--navy); font-size:22px; line-height:1.3; }
.bh-dau .vi { color:var(--acc); font-size:15px; font-weight:600; margin-top:4px; }
.bh-dau .tom { margin-top:10px; font-size:14px; color:var(--muted); line-height:1.7; }
.bh-dau .meta { margin-top:12px; display:flex; flex-wrap:wrap; gap:8px; }
.bh-dau .meta span { background:#fff; border:1px solid var(--line); border-radius:20px;
  padding:4px 12px; font-size:12.5px; color:var(--navy); }
.bh-dau .meta span i { font-style:normal; color:var(--acc); font-weight:700; }

.bh-thanh { position:sticky; top:0; z-index:20; background:#fff;
  border-bottom:1px solid var(--line); margin:18px 0 0; padding:9px 0;
  display:flex; gap:10px; align-items:center; flex-wrap:wrap; }
.bh-nut { display:inline-flex; border:1px solid var(--line-2); border-radius:8px; overflow:hidden; }
.bh-nut button { border:0; background:#fff; padding:6px 12px; font:inherit; font-size:12.5px;
  cursor:pointer; color:var(--muted); }
.bh-nut button + button { border-left:1px solid var(--line-2); }
.bh-nut button.on { background:var(--acc); color:#fff; font-weight:700; }
.bh-thanh .muc { margin-left:auto; font-size:12.5px; color:var(--muted); }

.bh-bai { margin-top:26px; }
.bh-bai > h2 { color:var(--navy); font-size:18.5px; line-height:1.35;
  padding-bottom:8px; border-bottom:2px solid var(--acc); display:inline-block; }
.bh-bai > h2 small { display:block; font-size:13.5px; color:var(--acc);
  font-weight:600; margin-top:3px; }

.bh-ly { display:grid; grid-template-columns:1fr 1fr; gap:0; margin-top:16px;
  background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  overflow:hidden; }
.bh-ly > div { padding:15px 18px; font-size:14.5px; line-height:1.75; }
.bh-ly .en { color:var(--navy); }
.bh-ly .vi { background:var(--acc-soft); border-left:1px solid var(--line);
  color:#334155; font-size:14px; }
.bh-ly h3 { font-size:14.5px; color:var(--navy); margin:0 0 6px; }
.bh-ly p + p { margin-top:9px; }
.bh-ly ul, .bh-ly ol { margin:8px 0 0 20px; }
.bh-ly li { margin:4px 0; }
.bh-ly b { color:var(--navy); }
.bh-ly .nhan { display:block; font-size:10.5px; letter-spacing:.7px; text-transform:uppercase;
  color:var(--muted); font-weight:700; margin-bottom:7px; }
body.bh-en .bh-ly { grid-template-columns:1fr; }
body.bh-en .bh-ly .vi { display:none; }
body.bh-vi .bh-ly { grid-template-columns:1fr; }
body.bh-vi .bh-ly .en { display:none; }
body.bh-vi .bh-ly .vi { border-left:0; }

.bh-vd { background:#fff; border:1px solid var(--line-2); border-left:4px solid var(--acc);
  border-radius:8px; padding:14px 17px; margin-top:14px; font-size:14.5px; line-height:1.7; }
.bh-vd .nhan { font-size:10.5px; letter-spacing:.7px; text-transform:uppercase;
  color:var(--acc); font-weight:700; }
.bh-vd .giai { margin-top:9px; padding-top:9px; border-top:1px dashed var(--line); }
.bh-vd .giai b:first-child { color:var(--acc); }

.bh-bay { background:var(--warnbg); border:1px solid #F5D9AE; border-radius:8px;
  padding:12px 16px; margin-top:14px; font-size:14px; line-height:1.7; color:#7C4A03; }
.bh-bay .nhan { font-weight:700; color:var(--warn); }

.bh-chot { background:#F0FDF4; border:1px solid #BBF7D0; border-radius:8px;
  padding:12px 16px; margin-top:14px; font-size:14px; line-height:1.7; color:#14532D; }
.bh-chot .nhan { font-weight:700; color:#15803D; }

.bh-hinh { margin-top:16px; text-align:center; background:var(--card);
  border:1px solid var(--line); border-radius:var(--radius); padding:16px; }
.bh-hinh svg { max-width:100%; height:auto; }
.bh-hinh .chu { margin-top:9px; font-size:13px; color:var(--muted); line-height:1.6;
  text-align:left; }
.bh-hinh .chu b { color:var(--navy); }

.bh-luyen { margin-top:34px; padding-top:22px; border-top:2px solid var(--line-2); }
.bh-cau { background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:16px 18px; margin-top:14px; }
.bh-cau .so { font-size:11.5px; letter-spacing:.5px; text-transform:uppercase;
  color:var(--muted); font-weight:700; }
.bh-cau .tang { display:inline-block; margin-left:8px; border-radius:20px; padding:1px 9px;
  font-size:11px; font-weight:700; letter-spacing:.3px; }
.bh-cau .tang.K  { background:#FEF3C7; color:#92400E; }
.bh-cau .tang.RK { background:#FEE2E2; color:#991B1B; }
.bh-cau .de { margin-top:8px; font-size:15px; line-height:1.75; color:var(--navy); }
.bh-cau .pa { margin-top:12px; display:grid; gap:7px; }
.bh-cau .pa button { text-align:left; background:#fff; border:1px solid var(--line-2);
  border-radius:8px; padding:10px 13px; font:inherit; font-size:14.5px; cursor:pointer;
  display:flex; gap:10px; align-items:flex-start; line-height:1.6; }
.bh-cau .pa button:hover:not(:disabled) { border-color:var(--acc-lite); background:var(--acc-soft); }
.bh-cau .pa button:disabled { cursor:default; }
.bh-cau .pa button .k { flex:none; width:23px; height:23px; border-radius:50%;
  border:1px solid var(--line-2); display:flex; align-items:center; justify-content:center;
  font-size:12.5px; font-weight:700; color:var(--muted); }
.bh-cau .pa button.dung { border-color:#15803D; background:#F0FDF4; }
.bh-cau .pa button.dung .k { background:#15803D; border-color:#15803D; color:#fff; }
.bh-cau .pa button.sai { border-color:#B91C1C; background:#FEF2F2; }
.bh-cau .pa button.sai .k { background:#B91C1C; border-color:#B91C1C; color:#fff; }
.bh-cau .giai { margin-top:13px; padding-top:12px; border-top:1px dashed var(--line);
  font-size:14px; line-height:1.75; color:#334155; }
.bh-cau .giai .nhan { font-weight:700; color:var(--acc); }

.bh-frq { background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:18px 20px; margin-top:16px; }
.bh-frq h3 { color:var(--navy); font-size:16px; }
.bh-frq h3 .diem { float:right; font-size:12.5px; color:var(--muted); font-weight:400; }
.bh-frq .de { margin-top:10px; font-size:14.5px; line-height:1.8; color:var(--navy); }
.bh-frq textarea { width:100%; font:inherit; font-size:14.5px; line-height:1.6; padding:12px;
  border:1px solid var(--line-2); border-radius:8px; margin-top:12px; resize:vertical;
  min-height:190px; }
.bh-frq textarea:focus { outline:2px solid var(--acc-lite); border-color:transparent; }
.bh-frq .chan { margin-top:11px; display:flex; gap:12px; align-items:center; flex-wrap:wrap; }
.bh-frq .chan .muted { font-size:12.5px; }
.bh-frq .kq { margin-top:14px; padding-top:13px; border-top:1px dashed var(--line); font-size:14px; }
.bh-frq .kq .diem-to { font-size:30px; font-weight:800; color:var(--acc); line-height:1; }
.bh-frq .kq .tc { margin-top:10px; }
.bh-frq .kq .tc > div { padding:7px 0; border-bottom:1px solid var(--line); }
.bh-frq .kq .tc b { color:var(--navy); }
.bh-frq .kq .tc p { color:var(--muted); font-size:13.5px; margin-top:3px; line-height:1.65; }
.bh-frq .mau { margin-top:14px; background:#F0FDF4; border:1px solid #BBF7D0;
  border-radius:8px; padding:13px 16px; font-size:14px; line-height:1.75; color:#14532D; }
.bh-frq .mau .nhan { font-weight:700; color:#15803D; display:block; margin-bottom:6px; }


#bhMuc .kh-chuong { margin-top:26px; padding-top:20px; border-top:1px solid var(--line); }
#bhMuc .kh-chuong:first-child { border-top:0; padding-top:0; }
#bhMuc .kh-ds { margin-top:12px; }

@media (max-width:820px) {
  .bh-ly { grid-template-columns:1fr; }
  .bh-ly .vi { border-left:0; border-top:1px solid var(--line); }
  .bh-thanh { position:static; }
  .bh-dau h1 { font-size:19px; }
}

.mock-chon-de { display:flex; gap:10px; flex-wrap:wrap; margin:14px 0 4px; }
.mock-chon-de button { flex:1 1 190px; text-align:left; background:#fff;
  border:1px solid var(--line-2); border-radius:10px; padding:11px 14px; font:inherit;
  cursor:pointer; }
.mock-chon-de button b { display:block; color:var(--navy); font-size:14.5px; }
.mock-chon-de button span { display:block; margin-top:3px; font-size:12.5px; color:var(--muted); }
.mock-chon-de button:hover { border-color:var(--acc-lite); }
.mock-chon-de button.on { border-color:var(--acc); border-width:2px; background:var(--acc-soft); }
.mock-chon-de button.on b { color:var(--acc); }
.mock-chon-de button.khoa { background:#FAFBFC; }
.mock-chon-de button.khoa b { color:var(--muted); }
.mock-chon-de button.khoa span { color:var(--acc); font-weight:600; }

.mock-khoa {
  border:1px solid var(--line-2); border-left:3px solid var(--acc); border-radius:10px;
  background:var(--acc-soft); padding:16px 18px; margin:16px 0;
  display:flex; flex-direction:column; gap:9px; align-items:flex-start;
}
.mock-khoa b { color:var(--navy); font-size:15.5px; }
.mock-khoa p { margin:0; font-size:14px; color:var(--txt); max-width:62ch; }
.mock-khoa .btn { margin-top:2px; }

.de-bang-o { overflow-x:auto; margin:14px 0; }
.de-bang { border-collapse:collapse; font-size:.94em; min-width:min(100%,340px); }
.de-bang th, .de-bang td {
  border:1px solid var(--line); padding:6px 12px; text-align:center; white-space:nowrap;
}
.de-bang th {
  text-align:left; background:#F4F7FA; font-weight:600; white-space:normal; min-width:130px;
}


.de-ma {
  overflow-x:auto; -webkit-overflow-scrolling:touch;
  background:#F4F7FA; border:1px solid var(--line); border-radius:8px;
  padding:11px 13px; margin:10px 0;
  font-family:ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size:13.5px; line-height:1.65; color:var(--navy);
}
.q-stem .de-ma, .bh-cau .de .de-ma, .q-giai .de-ma, .bh-cau .giai .de-ma { margin:9px 0; }

.q-stem svg, .q-opt svg, .q-giai svg,
.bh-cau .de svg, .bh-cau .giai svg, .bh-cau .pa svg, .bh-frq .de svg {
  max-width:100%; height:auto;
}

.q-opt code, .bh-cau .pa code, .q-stem code,
.q-giai code, .bh-cau .giai code, .bh-cau .de code { white-space:pre-wrap; }

.mock-xemlai { margin-top:18px; }
.mock-xl-sec { margin-top:16px; }
.mock-xl-cau { background:var(--card); border:1px solid var(--line); border-radius:var(--radius);
  padding:13px 15px; margin-top:10px; }
.mock-xl-cau .so { font-size:12px; letter-spacing:.4px; text-transform:uppercase;
  color:var(--muted); font-weight:600; }
.mock-xl-cau .de { margin-top:6px; font-size:15px; line-height:1.7; color:var(--navy); }
.mock-xl-cau .de svg { max-width:100%; height:auto; }
.mock-xl-pa { list-style:none; margin:11px 0 0; padding:0; display:grid; gap:6px; }
.mock-xl-pa li { display:flex; gap:9px; align-items:flex-start; font-size:14.5px;
  line-height:1.6; padding:7px 10px; border:1px solid var(--line-2); border-radius:8px; }
.mock-xl-pa li .k { flex:none; width:21px; height:21px; border-radius:50%; font-size:12px;
  display:flex; align-items:center; justify-content:center; border:1px solid var(--line-2);
  font-weight:700; }
.mock-xl-pa li.dung { border-color:#15803D; background:#F0FDF4; }
.mock-xl-pa li.dung .k { background:#15803D; border-color:#15803D; color:#fff; }
.mock-xl-pa li.sai { border-color:#B91C1C; background:#FEF2F2; }
.mock-xl-pa li.sai .k { background:#B91C1C; border-color:#B91C1C; color:#fff; }
.mock-xl-pa .nhan { font-size:11.5px; text-transform:uppercase; letter-spacing:.4px;
  margin-left:5px; }

.th-dai{max-width:1120px;margin:56px auto 28px;padding:18px 20px 20px;
  border-top:1px solid #e5e7eb;color:#6b7280;font-size:13.5px;line-height:1.65}
.th-dai p{margin:0}
.th-dai p + p{margin-top:7px}
.th-dai b{color:#111827}
.th-dai a{color:inherit;text-decoration:underline;text-underline-offset:2px}
.th-dai a:hover{color:#2563eb}
.th-ds{word-spacing:.02em}

.bac-thang{display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  margin:18px 0 6px;padding:10px 12px;border:1px solid #e5e7eb;border-radius:10px;
  background:#f9fafb}
.bac-nhan{font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:#6b7280;margin-right:4px}
.bac-thang .bac-di,.bac-thang .bac-o{display:flex;flex-direction:column;line-height:1.25;
  padding:6px 12px;border-radius:8px;font-size:14px;text-decoration:none}
.bac-thang .bac-di{color:#1f2937;border:1px solid #e5e7eb;background:#fff}
.bac-thang .bac-di:hover{border-color:#2563eb;color:#2563eb}
.bac-thang .bac-o{background:#111827;color:#fff;border:1px solid #111827}
.bac-thang small{font-size:11.5px;opacity:.7;font-weight:400}