:root{--xanh-dam:#0E3A5F;--xanh-nut:#1F6FB2;--xanh:#2A8BD6;--xanh-nhat:#8CC8F0;--nen:#E6F3FC;--trang:#FFFFFF;--vien:#cfe3f3;--chu-phu:#3b5f80}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Be Vietnam Pro',Arial,sans-serif;background:var(--nen);color:var(--xanh-dam);line-height:1.65;font-size:16px;-webkit-text-size-adjust:100%}
a{color:var(--xanh-nut)}
.yn{width:var(--d,40px);height:var(--d,40px);border-radius:50%;background:var(--xanh-dam);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:calc(var(--d,40px)*.4);letter-spacing:1px;flex:none;box-shadow:0 0 0 calc(var(--d,40px)*.06) var(--xanh-nhat)}
.thanh{background:#fff;border-bottom:1px solid var(--vien);position:sticky;top:0;z-index:5}
.thanh .trong{max-width:960px;margin:0 auto;padding:10px 16px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.thuonghieu{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--xanh-dam);font-weight:800;font-size:18px}
.thanh nav{display:flex;gap:4px 14px;flex-wrap:wrap}
.thanh nav a{text-decoration:none;color:var(--xanh-dam);font-weight:600;font-size:14px;padding:6px 2px}
.thanh nav a:hover,.thanh nav a[aria-current]{color:var(--xanh-nut);text-decoration:underline}
.hero{background:var(--xanh-dam);color:#fff;padding:48px 16px 56px}
.hero .trong{max-width:960px;margin:0 auto}
.hero h1{font-size:clamp(28px,6.5vw,46px);font-weight:800;line-height:1.2;max-width:18ch}
.hero p{margin-top:16px;font-size:clamp(16px,3.6vw,19px);color:var(--xanh-nhat);max-width:56ch}
.hero .nhan{display:inline-block;background:var(--xanh);color:#fff;border-radius:6px;padding:2px 10px;font-size:14px;font-weight:600;margin-bottom:14px}
.nut{display:inline-block;background:var(--xanh-nut);color:#fff;padding:12px 22px;border-radius:8px;font-weight:600;text-decoration:none;border:2px solid var(--xanh-nut);font-family:inherit;font-size:16px;cursor:pointer}
.nut:hover{background:#18598f;border-color:#18598f}
.nut2{display:inline-block;background:transparent;color:var(--xanh-nut);padding:10px 20px;border-radius:8px;font-weight:600;text-decoration:none;border:2px solid var(--xanh-nut)}
.hero .nut2{color:#fff;border-color:var(--xanh-nhat)}
.hero .nut{background:var(--xanh);border-color:var(--xanh)}
.hang{margin-top:24px;display:flex;gap:12px;flex-wrap:wrap}
main{max-width:960px;margin:0 auto;padding:8px 16px 40px}
section{background:#fff;border:1px solid var(--vien);border-radius:12px;padding:24px 20px;margin:16px 0}
h2{font-size:clamp(22px,5vw,28px);font-weight:800;line-height:1.3;margin-bottom:8px}
h3{font-size:18px;font-weight:800;line-height:1.35}
.dan{color:var(--chu-phu);margin-bottom:16px}
p+p{margin-top:12px}
ul.ds,ol.ds{margin:10px 0 0 22px}
ul.ds li,ol.ds li{margin:6px 0}
.luoi{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px;margin-top:14px}
.the{border:1px solid var(--vien);border-radius:10px;padding:16px;background:#fff;display:flex;flex-direction:column;gap:6px}
.the p{font-size:15px;color:var(--chu-phu);margin:0}
.the .gia{font-weight:800;color:var(--xanh-dam);font-size:16px}
.the .nhom{font-size:13px;font-weight:600;color:var(--xanh-nut)}
.the .nut,.the .nut2{margin-top:auto;text-align:center}
.nhac{background:var(--nen);border-left:5px solid var(--xanh);padding:12px 16px;border-radius:0;margin-top:14px;font-size:15px}
.canh{background:#fff8e6;border-left:5px solid #c58a00;padding:12px 16px;border-radius:0;margin-top:14px;font-size:15px;color:#4d3800}
.buoc{counter-reset:b;list-style:none;margin:12px 0 0;padding:0}
.buoc li{counter-increment:b;display:flex;gap:12px;margin:10px 0}
.buoc li::before{content:counter(b);flex:none;width:28px;height:28px;border-radius:50%;background:var(--xanh-nut);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:14px}
form{display:grid;gap:14px;margin-top:12px}
label{font-weight:600;font-size:15px;display:block;margin-bottom:4px}
input,select,textarea{width:100%;font-family:inherit;font-size:16px;padding:11px 12px;border:1.5px solid #a9c8e2;border-radius:8px;color:var(--xanh-dam);background:#fff}
input:focus,select:focus,textarea:focus{outline:3px solid var(--xanh-nhat);border-color:var(--xanh-nut)}
textarea{min-height:120px;resize:vertical}
.bay{position:absolute;left:-9999px;height:0;overflow:hidden}
.nhanh{font-size:14px;color:var(--chu-phu)}
#ketqua{font-weight:600;padding:12px 14px;border-radius:8px;display:none}
#ketqua.ok{display:block;background:#e9f7ee;color:#14532d}
#ketqua.loi{display:block;background:#fdf1ef;color:#7a1f14}
footer{background:var(--xanh-dam);color:#cfe6f7;padding:28px 16px;font-size:14px}
footer .trong{max-width:960px;margin:0 auto}
footer a{color:var(--xanh-nhat)}
footer p+p{margin-top:8px}
@media (min-width:700px){section{padding:32px 32px}.hero{padding:72px 16px 80px}}
.luoi-gio{display:flex;flex-wrap:wrap;gap:8px}
.luoi-gio button{font-family:inherit;font-size:16px;font-weight:600;padding:10px 16px;border-radius:8px;border:2px solid var(--xanh-nut);background:#fff;color:var(--xanh-nut);cursor:pointer;min-width:84px}
.luoi-gio button[aria-checked="true"]{background:var(--xanh-nut);color:#fff}
.luoi-gio button:focus-visible{outline:3px solid var(--xanh-nhat)}
.qr-khung{display:flex;justify-content:center;margin:12px 0;padding:12px;background:#fff;border:1px solid var(--vien);border-radius:12px}
.qr-khung img{max-width:100%;height:auto}
[hidden]{display:none !important}
.thongbao{background:var(--xanh);color:#fff;text-align:center;padding:10px 16px;font-weight:600;font-size:15px}