@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Source+Serif+4:ital,opsz,wght@0,8..60,400;0,8..60,600;1,8..60,400&display=swap');
:root{
  --navy:#0d1b2a; --navy-2:#132c45; --muc:#1b2733; --chu:#26323f; --nhat:#5b6b7c;
  --nen:#ffffff; --nen-2:#f4f6f9; --vien:#e2e8f0;
  --xanh:#1668dc; --xanh-dam:#0f4fa8; --xanh-nhat:#e8f1fe;
  --len:#0f9d76; --xuong:#d1495b; --vang:#b8860b;
  --bong:0 1px 2px rgba(13,27,42,.06), 0 10px 30px rgba(13,27,42,.06);
  --bong-sau:0 18px 50px rgba(13,27,42,.14);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--nen);color:var(--chu);
  font:16px/1.7 Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased}
a{color:var(--xanh);text-decoration:none}
a:hover{text-decoration:underline}
.boc{max-width:1200px;margin:0 auto;padding:0 24px}
.hep{max-width:820px;margin:0 auto;padding:0 24px}

/* Thanh dieu huong */
nav{background:var(--navy);position:sticky;top:0;z-index:30}
nav .boc{display:flex;align-items:center;gap:28px;height:64px}
nav .hieu{font-weight:700;font-size:18px;color:#fff;letter-spacing:-.3px}
nav .hieu span{color:#5aa9ff}
nav .menu{display:flex;gap:22px;margin-left:auto;align-items:center;flex-wrap:wrap}
nav .menu a{color:#c8d6e5;font-size:15px}
nav .menu a:hover{color:#fff;text-decoration:none}
nav .menu a.dang{color:#fff;font-weight:600}
nav .nut{background:var(--xanh);color:#fff;padding:9px 18px;border-radius:8px;font-size:15px;font-weight:600}
nav .nut:hover{background:#1f7aff;text-decoration:none}

/* Phan mo dau */
.dau{position:relative;overflow:hidden;color:#fff;padding:70px 0 78px;
  background:radial-gradient(900px 520px at 78% 8%,#1a3f6b 0%,rgba(26,63,107,0) 62%),
             radial-gradient(700px 480px at 10% 100%,#15355c 0%,rgba(21,53,92,0) 60%),
             linear-gradient(160deg,var(--navy) 0%,var(--navy-2) 100%)}
.dau:before{content:"";position:absolute;inset:0;opacity:.35;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:54px 54px;
  mask-image:radial-gradient(760px 420px at 70% 20%,#000 0%,transparent 75%);
  -webkit-mask-image:radial-gradient(760px 420px at 70% 20%,#000 0%,transparent 75%)}
.dau .boc{position:relative;z-index:2}
.dau h1{margin:0 0 16px;font-size:clamp(32px,4.2vw,52px);line-height:1.08;letter-spacing:-1.6px;max-width:18ch;font-weight:800}
.dau h1 em{font-style:normal;white-space:nowrap;background:linear-gradient(95deg,#5aa9ff,#8ee7ff);-webkit-background-clip:text;
  background-clip:text;color:transparent}
.dau p{margin:0;max-width:56ch;color:#c2d3e6;font-size:18px;line-height:1.65}
.dau .moc{display:inline-flex;align-items:center;gap:8px;background:rgba(90,169,255,.14);color:#8ec2ff;border-radius:999px;
  padding:7px 15px;font-size:13px;font-weight:600;margin-bottom:20px;letter-spacing:.2px;border:1px solid rgba(90,169,255,.22)}
.dau .moc:before{content:"";width:7px;height:7px;border-radius:50%;background:#37d39f;box-shadow:0 0 0 3px rgba(55,211,159,.22)}
.dau .nut-lon{display:inline-block;margin-top:26px;background:var(--xanh);color:#fff;font-weight:600;
  padding:14px 28px;border-radius:11px;font-size:16px;box-shadow:0 10px 26px rgba(22,104,220,.38)}
.dau .nut-lon:hover{background:#1f7aff;text-decoration:none;transform:translateY(-1px)}
.dau .nut-phu{display:inline-block;margin:26px 0 0 14px;color:#c2d3e6;font-weight:600;padding:14px 0;
  border-bottom:1px solid rgba(194,211,230,.35)}
.dau .nut-phu:hover{color:#fff;text-decoration:none}

/* Mo dau hai cot cho trang chu: chu ben trai, o nhap nhanh ben phai */
.dau-doi .boc{display:grid;grid-template-columns:minmax(0,1.15fr) 380px;gap:56px;align-items:center}
.dau .tin-cay{display:flex;flex-wrap:wrap;gap:8px 22px;margin-top:26px;color:#93aec9;font-size:14px}
.dau .tin-cay span{display:flex;align-items:center;gap:7px}
.dau .tin-cay span:before{content:"";width:5px;height:5px;border-radius:50%;background:#5aa9ff}
.o-nhanh{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.14);border-radius:20px;padding:26px;
  backdrop-filter:blur(8px);box-shadow:0 24px 60px rgba(4,12,24,.4)}
.o-nhanh strong{display:block;font-size:19px;line-height:1.3;color:#fff;margin-bottom:6px}
.o-nhanh p{font-size:14.5px;color:#a9c0d8;margin:0 0 18px;max-width:none}
.o-nhanh label{display:block;font-size:12.5px;font-weight:600;color:#93aec9;margin:0 0 6px}
.o-nhanh select,.o-nhanh input{width:100%;border:1px solid rgba(255,255,255,.18);border-radius:11px;padding:12px 13px;
  font:inherit;font-size:15px;background:rgba(9,22,38,.6);color:#fff;margin-bottom:14px}
.o-nhanh select option{color:#12212f}
.o-nhanh button{width:100%;background:var(--xanh);color:#fff;border:0;border-radius:11px;padding:14px;
  font:600 16px Inter,sans-serif;cursor:pointer}
.o-nhanh button:hover{background:#1f7aff}
.o-nhanh .duoi-o{margin:14px 0 0;font-size:13px;color:#8ba4bd;text-align:center}

/* O so lieu */
.so{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin:-38px 0 0;position:relative;z-index:5}
.o{background:var(--nen);border:1px solid var(--vien);border-radius:14px;padding:18px 20px;box-shadow:var(--bong)}
.o .n{font-size:30px;font-weight:700;letter-spacing:-.8px;color:var(--muc)}
.o .t{color:var(--nhat);font-size:13px;margin-top:4px}
.o .phu{font-size:13px;color:var(--len);margin-top:8px;font-weight:600}

section{padding:52px 0}
section.xam{background:var(--nen-2);border-top:1px solid var(--vien);border-bottom:1px solid var(--vien)}
.nhan-muc{font-size:12.5px;font-weight:700;letter-spacing:1.4px;text-transform:uppercase;color:var(--xanh);margin-bottom:10px}
section h2{font-size:28px;margin:0 0 10px;letter-spacing:-.6px;color:var(--muc);font-weight:700}
section .mo{color:var(--nhat);margin:0 0 26px;font-size:16.5px;max-width:760px}
.xem-them{display:inline-block;margin-top:18px;font-weight:600}

/* The */
.the-luoi{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:20px}
.the{background:var(--nen);border:1px solid var(--vien);border-radius:14px;padding:22px;box-shadow:var(--bong);
  display:flex;flex-direction:column;transition:box-shadow .18s,transform .18s}
.the:hover{box-shadow:var(--bong-sau);transform:translateY(-2px)}
.the h3{margin:0 0 10px;font-size:18px;color:var(--muc);line-height:1.35}
.the .so-lon{font-size:34px;font-weight:700;letter-spacing:-1px;margin:4px 0 6px;color:var(--muc)}
.the .dien{color:var(--nhat);font-size:15px;margin:0}
.the .duoi{margin-top:auto;padding-top:16px;font-weight:600;font-size:15px}
.nhan{display:inline-block;font-size:11.5px;font-weight:700;letter-spacing:.6px;text-transform:uppercase;
  padding:4px 10px;border-radius:6px;background:var(--xanh-nhat);color:var(--xanh-dam);margin-bottom:12px}
.nhan.mat{background:#e6f7f1;color:#0b7a5c}
.nhan.canh{background:#fdeef0;color:#a8344a}
.nhan.cho{background:#fff6e5;color:#96690a}

/* Bang */
.khung-bang{border:1px solid var(--vien);border-radius:14px;overflow:hidden;box-shadow:var(--bong);background:#fff}
.cuon{max-height:68vh;overflow:auto}
table{width:100%;border-collapse:collapse;font-size:15px;background:#fff}
th,td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--vien);white-space:nowrap}
th{background:var(--nen-2);font-weight:600;font-size:13.5px;color:var(--nhat);position:sticky;top:0;
  cursor:pointer;user-select:none;letter-spacing:.2px}
th:hover{background:#eceff4}
tbody tr:nth-child(even){background:#fbfcfe}
tbody tr:hover{background:var(--xanh-nhat)}
td.p,th.p{text-align:right;font-variant-numeric:tabular-nums}
tbody tr:last-child td{border-bottom:0}
.thanh-nen{display:inline-block;width:70px;height:8px;background:#e6ebf2;border-radius:5px;margin-right:9px;
  vertical-align:middle;overflow:hidden}
.thanh{display:block;height:100%;background:var(--len);border-radius:5px}
.thanh.cham{background:var(--vang)}
.thanh.rat-cham{background:var(--xuong)}
.re{color:var(--len);font-weight:600}
.dat{color:var(--xuong)}

/* Bo loc va tab */
.loc{background:#fff;border:1px solid var(--vien);border-radius:14px;padding:18px 20px;margin-bottom:18px;
  display:flex;gap:18px;flex-wrap:wrap;align-items:end;box-shadow:var(--bong)}
.loc label{display:block;font-size:12.5px;color:var(--nhat);margin-bottom:6px;font-weight:600}
.loc input,.loc select{border:1px solid var(--vien);border-radius:9px;padding:10px 12px;font:inherit;
  background:#fff;min-width:130px;color:var(--chu)}
.loc input:focus,.loc select:focus{outline:2px solid var(--xanh-nhat);border-color:var(--xanh)}
.tab{display:flex;gap:8px;margin:0 0 18px;flex-wrap:wrap}
.tab button{background:#fff;border:1px solid var(--vien);border-radius:10px;padding:10px 18px;cursor:pointer;
  font:inherit;font-size:15px;color:var(--chu)}
.tab button:hover{border-color:var(--xanh)}
.tab button.chon{background:var(--navy);color:#fff;border-color:var(--navy)}
.ghi{color:var(--nhat);font-size:14px;margin:14px 0 0}

/* Bai viet */
.bai{background:#fff;border:1px solid var(--vien);border-radius:14px;overflow:hidden;box-shadow:var(--bong);
  display:flex;flex-direction:column;transition:box-shadow .18s,transform .18s}
.bai:hover{box-shadow:var(--bong-sau);transform:translateY(-2px)}
.bai .anh{height:8px;background:linear-gradient(90deg,var(--xanh),#5aa9ff)}
.bai .trong{padding:22px}
.bai .ngay{color:var(--nhat);font-size:13px;margin-bottom:9px}
.bai h3{margin:0 0 10px;font-size:18.5px;line-height:1.35;color:var(--muc)}
.bai p{margin:0;color:var(--nhat);font-size:15px}
.bai .doc{margin-top:16px;font-weight:600;font-size:15px}

.viet{padding:44px 0 20px}
.viet h1{font-size:36px;line-height:1.2;margin:0 0 12px;letter-spacing:-.9px;color:var(--muc)}
.viet .gt{color:var(--nhat);font-size:15px;margin-bottom:30px}
.viet h2{font-size:24px;margin:38px 0 12px;color:var(--muc);letter-spacing:-.4px}
.viet h3{font-size:19px;margin:28px 0 10px;color:var(--muc)}
.viet p,.viet li{font-size:17px;line-height:1.8}
.viet table{margin:22px 0;border:1px solid var(--vien);border-radius:12px;overflow:hidden;display:block;overflow-x:auto}
.viet th{position:static}
.viet blockquote{margin:26px 0;padding:18px 24px;border-left:4px solid var(--xanh);background:var(--xanh-nhat);
  border-radius:0 12px 12px 0}
.viet blockquote p{margin:0;font-size:17px}
.chot{background:var(--navy);color:#fff;border-radius:14px;padding:26px 28px;margin:32px 0}
.chot h3{color:#fff;margin:0 0 10px;font-size:20px}
.chot p{color:#c8d6e5;margin:0 0 8px;font-size:16.5px}
.chot strong{color:#fff}

/* Form lien he */
.hop-lien-he{background:#fff;border:1px solid var(--vien);border-radius:16px;padding:30px;
  box-shadow:var(--bong);display:grid;grid-template-columns:1.05fr 1fr;gap:32px}
.hop-lien-he form{display:grid;gap:13px}
.hop-lien-he input,.hop-lien-he select,.hop-lien-he textarea{border:1px solid var(--vien);border-radius:10px;
  padding:12px 13px;font:inherit;background:#fff;width:100%;color:var(--chu)}
.hop-lien-he button{background:var(--xanh);color:#fff;border:0;border-radius:10px;padding:14px 20px;font:inherit;
  font-weight:600;cursor:pointer;font-size:16px}
.hop-lien-he button:hover{background:#1f7aff}
.ket-qua{font-size:14.5px;margin-top:4px}

footer{background:var(--navy);color:#8fa4b8;padding:38px 0;margin-top:56px;font-size:14.5px}
footer .boc{display:flex;gap:24px;flex-wrap:wrap;justify-content:space-between}
footer a{color:#c8d6e5}

@media(max-width:980px){
  .dau-doi .boc{grid-template-columns:1fr;gap:32px}
}
@media(max-width:820px){
  .dau{padding:40px 0 36px}
  .dau h1{letter-spacing:-.9px;max-width:none}
  .dau .nut-lon,.dau .nut-phu{display:block;text-align:center;margin-left:0}
  .dau .nut-phu{border-bottom:0}
  .so{margin-top:20px}
  .hop-lien-he{grid-template-columns:1fr;padding:22px}
  section{padding:38px 0}
  section h2{font-size:23px}
  .viet h1{font-size:27px}
  nav .boc{height:auto;padding-top:12px;padding-bottom:12px;flex-wrap:wrap;gap:14px}
}

/* Anh du an */
.the-anh{height:170px;background:#dfe6ee center/cover no-repeat;border-radius:14px 14px 0 0;margin:-22px -22px 16px}
.the .the-anh+.nhan{margin-top:0}
.dau.co-anh{position:relative;overflow:hidden;min-height:340px}
.dau.co-anh .anh-nen{position:absolute;inset:0;background:center/cover no-repeat;opacity:.28}
.dau.co-anh .boc{position:relative}
.anh-nguoi{width:150px;height:150px;border-radius:50%;object-fit:cover;background:var(--navy);
  box-shadow:0 6px 20px rgba(13,27,42,.18)}
.hop-lien-he.toi{grid-template-columns:150px 1fr;align-items:start}
.loi-toi{margin:0 0 12px;font-size:16.5px}
.phu-lh{margin:0 0 14px;color:#5b6b7c}
.cong-thuc.ngoai{margin:0 0 18px;border-style:solid;border-color:#f0c36d;background:#fffaf0;color:var(--chu)}

/* Doi ngon ngu */
.doi-tieng{display:flex;gap:2px;border:1px solid #2c4661;border-radius:8px;padding:2px}
nav .menu .doi-tieng a{color:#8fa4b8;font-size:13px;font-weight:600;padding:4px 8px;border-radius:6px}
nav .menu .doi-tieng a.dang{background:#fff;color:var(--navy)}
.doi-tieng a:hover{text-decoration:none;color:#fff}
nav .menu .doi-tieng a.dang:hover{color:var(--navy)}

/* Kenh lien he */
.kenh{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:16px}
.kenh .ten{width:100%;font-size:14px;color:var(--nhat);font-weight:600}
.kenh a{display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border-radius:999px;font-size:14.5px;
  font-weight:600;color:#fff;text-decoration:none}
.kenh a:hover{text-decoration:none;filter:brightness(1.08)}
.k-tele{background:#229ed9}.k-zalo{background:#0068ff}.k-goi{background:#0f9d76}
.noi{position:fixed;right:16px;bottom:16px;z-index:40;display:flex;flex-direction:column;gap:8px}
.noi a{width:52px;height:52px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;
  font-size:12px;font-weight:700;box-shadow:0 6px 18px rgba(0,0,0,.22);text-decoration:none}
.noi a:hover{text-decoration:none}
.noi svg{width:24px;height:24px;fill:#fff}
@media(max-width:820px){
  .hop-lien-he.toi{grid-template-columns:1fr}
  .noi{right:12px;bottom:12px}
  .noi a{width:46px;height:46px}
}
.cong-thuc{background:#fff;border:1px dashed var(--vien);border-radius:12px;padding:14px 18px;color:var(--nhat);font-size:14.5px;margin-top:18px}
.bai .anh{height:150px;background:#dfe6ee center/cover no-repeat}

/* Tim can theo so tien, trang ngan sach */
.tc-loc{align-items:end}
.tc-loc .nut-tim{background:var(--xanh);color:#fff;border:0;border-radius:8px;padding:11px 18px;font-weight:600;font-size:15px;cursor:pointer;width:100%}
.tc-loc .nut-tim:hover{background:#1f7aff}
.tc-tom{font-size:18px;font-weight:600;color:var(--muc);margin:18px 0 6px}
#tc-ket .the-luoi{margin-top:14px}
#tc-ket .cong-thuc{margin-top:20px}
.chip-luoi{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.chip{display:inline-block;padding:7px 13px;border:1px solid var(--vien);border-radius:999px;background:#fff;font-size:14px;color:var(--chu)}
.chip:hover{border-color:var(--xanh);color:var(--xanh);text-decoration:none}
.ns-hang{margin:0 0 16px}
.ns-hang strong{font-size:15px;color:var(--muc)}
.the .nhan+.nhan{margin-left:4px}
.tc-loc>div{min-width:0;max-width:100%}
.tc-loc select,.tc-loc input{width:100%;max-width:100%;min-width:0}

/* ================= Trang bai viet kieu tap chi ================= */
.tien-do{position:fixed;top:0;left:0;height:3px;background:var(--xanh);z-index:60;width:0;transition:width .1s}
.bv-khung{max-width:1080px;margin:0 auto;padding:0 24px}
.bv-dau{background:#fff;padding:52px 0 30px}
.bv-muc{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:1.3px;text-transform:uppercase;color:var(--xanh);margin-bottom:16px}
.bv-dau h1{font-size:46px;line-height:1.12;letter-spacing:-1.4px;font-weight:800;color:var(--navy);margin:0 0 18px;max-width:900px}
.bv-dan{font-family:"Source Serif 4",Georgia,serif;font-size:22px;line-height:1.5;color:#44536a;margin:0 0 26px;max-width:780px}
.bv-tac-gia{display:flex;align-items:center;gap:12px;padding-top:20px;border-top:1px solid var(--vien);max-width:780px}
.bv-tac-gia img{width:44px;height:44px;border-radius:50%;object-fit:cover}
.bv-tac-gia strong{display:block;font-size:15px;color:var(--navy)}
.bv-tac-gia span{font-size:14px;color:var(--nhat)}
.bv-anh{max-width:1080px;margin:0 auto 8px;padding:0 24px}
.bv-anh div{aspect-ratio:21/9;border-radius:18px;background:#dfe6ee center/cover no-repeat}

.bv-than{max-width:1080px;margin:0 auto;padding:36px 24px 64px;display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:64px}
.bv-bai{min-width:0;font-family:"Source Serif 4",Georgia,serif;font-size:19.5px;line-height:1.75;color:#1f2937}
.bv-bai p{margin:0 0 1.15em}
.bv-bai h2{font-family:Inter,sans-serif;font-size:27px;line-height:1.25;letter-spacing:-.6px;color:var(--navy);margin:2.1em 0 .7em;font-weight:800;scroll-margin-top:90px}
.bv-bai h3{font-family:Inter,sans-serif;font-size:21px;color:var(--navy);margin:1.6em 0 .5em}
.bv-bai strong{color:var(--navy);font-weight:600}
.bv-bai a{color:var(--xanh);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.bv-bai ul,.bv-bai ol{margin:0 0 1.3em;padding-left:0;list-style:none}
.bv-bai li{position:relative;padding-left:34px;margin:0 0 .75em}
.bv-bai ul li:before{content:"";position:absolute;left:10px;top:.72em;width:8px;height:8px;border-radius:50%;background:var(--xanh)}
.bv-bai ol{counter-reset:so}
.bv-bai ol li{counter-increment:so}
.bv-bai ol li:before{content:counter(so);position:absolute;left:0;top:.2em;width:24px;height:24px;border-radius:50%;background:var(--xanh-nhat);
  color:var(--xanh);font:700 13px/24px Inter,sans-serif;text-align:center}
.bv-bai blockquote{margin:1.6em 0;padding:4px 0 4px 24px;border-left:4px solid var(--xanh);font-size:23px;line-height:1.5;color:var(--navy);font-style:italic}
.bv-bai blockquote p{margin:0}
.bv-bang{margin:1.4em 0 1.8em;border:1px solid var(--vien);border-radius:14px;overflow-x:auto;background:#fff;box-shadow:0 1px 2px rgba(13,27,42,.04)}
.bv-bai table{font-family:Inter,sans-serif;font-size:16px;width:100%;border-collapse:collapse;margin:0}
.bv-bai th{background:var(--navy);color:#dfe8f3;font-size:13px;font-weight:600;letter-spacing:.3px;text-transform:uppercase;text-align:left;padding:13px 18px;position:static}
.bv-bai td{padding:14px 18px;border-top:1px solid var(--vien);color:var(--chu)}
.bv-bai tr:nth-child(even) td{background:#f8fafc}
.bv-bai td.p,.bv-bai th.p{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.bv-bai td strong{color:var(--xanh)}
.bv-tom{font-family:Inter,sans-serif;background:var(--xanh-nhat);border-radius:16px;padding:24px 28px;margin:0 0 2em}
.bv-tom h2{font-size:14px;letter-spacing:1.2px;text-transform:uppercase;color:var(--xanh);margin:0 0 12px}
.bv-tom ul{margin:0}
.bv-tom li{font-size:16.5px;line-height:1.6;margin:0 0 .6em;color:var(--navy)}
.bv-tom li:last-child{margin-bottom:0}

.bv-du-an{font-family:Inter,sans-serif;margin:2.4em 0 0}
.bv-du-an h2{margin-top:0}
.bv-du-an .luoi{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.bv-du-an a.the-da{display:block;border:1px solid var(--vien);border-radius:14px;overflow:hidden;background:#fff;text-decoration:none;color:inherit;transition:box-shadow .15s}
.bv-du-an a.the-da:hover{box-shadow:0 8px 24px rgba(13,27,42,.1)}
.bv-du-an .anh{height:130px;background:#dfe6ee center/cover no-repeat}
.bv-du-an .chu{padding:14px 16px}
.bv-du-an strong{display:block;font-size:15.5px;color:var(--navy);line-height:1.3;margin-bottom:4px}
.bv-du-an span{font-size:14px;color:var(--nhat)}

.bv-chot{font-family:Inter,sans-serif;margin-top:3em;background:var(--navy);color:#dfe8f3;border-radius:20px;padding:32px}
.bv-chot h2{color:#fff;margin:0 0 8px;font-size:25px}
.bv-chot p{font-size:16px;line-height:1.6;color:#b9cbdd;margin:0 0 20px}
.bv-chot form{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.bv-chot input{border:0;border-radius:10px;padding:13px 14px;font:inherit;font-size:15px}
.bv-chot input[name=nhu_cau]{grid-column:1/-1}
.bv-chot button{grid-column:1/-1;background:var(--xanh);color:#fff;border:0;border-radius:10px;padding:14px;font:600 16px Inter,sans-serif;cursor:pointer}
.bv-chot button:hover{background:#1f7aff}
.bv-chot .ket-qua{grid-column:1/-1;color:#fff}
.bv-chot .kenh .ten{color:#b9cbdd}

.bv-ben{font-family:Inter,sans-serif}
.bv-dinh{position:sticky;top:88px}
.bv-muc-luc{border-left:2px solid var(--vien);padding:2px 0 2px 18px;margin-bottom:28px}
.bv-muc-luc strong{display:block;font-size:12.5px;letter-spacing:1.2px;text-transform:uppercase;color:var(--nhat);margin-bottom:12px}
.bv-muc-luc a{display:block;font-size:14.5px;line-height:1.4;color:var(--chu);padding:6px 0}
.bv-muc-luc a:hover{color:var(--xanh);text-decoration:none}
.bv-the-cta{background:var(--nen-2);border-radius:16px;padding:22px}
.bv-the-cta strong{display:block;font-size:17px;color:var(--navy);line-height:1.35;margin-bottom:8px}
.bv-the-cta p{font-size:14.5px;color:var(--nhat);margin:0 0 16px;line-height:1.55}
.nut-cta{display:block;text-align:center;background:var(--xanh);color:#fff;font-weight:600;font-size:15px;padding:11px;border-radius:10px;margin-bottom:8px}
.nut-cta:hover{background:#1f7aff;text-decoration:none}
.nut-cta.phu{background:#fff;color:var(--xanh);border:1px solid var(--vien)}
.bv-lien-quan{padding:48px 0 12px}

@media(max-width:960px){
  .bv-than{grid-template-columns:1fr;gap:0}
  .bv-ben{display:none}
}
@media(max-width:640px){
  .bv-dau{padding:32px 0 20px}
  .bv-dau h1{font-size:31px;letter-spacing:-.8px}
  .bv-dan{font-size:18.5px}
  .bv-anh{padding:0}
  .bv-anh div{border-radius:0;aspect-ratio:16/10}
  .bv-than{padding:26px 20px 48px}
  .bv-bai{font-size:18px}
  .bv-bai h2{font-size:23px}
  .bv-bai th,.bv-bai td{padding:11px 12px}
  .bv-tom{padding:20px}
  .bv-chot{padding:24px 20px;border-radius:16px}
  .bv-chot form{grid-template-columns:1fr}
}