:root{
  --xanh:#1B6CA8;
  --xanh-dam:#114E7E;
  --xanh-nhat:#EAF3FB;
  --xanh-vien:#C7E0F2;
  --navy:#143A5A;
  --den:#15212E;
  --xam:#566373;
  --xam-nhat:#F4F7FA;
  --trang:#FFFFFF;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Be Vietnam Pro',system-ui,sans-serif;color:var(--den);background:var(--trang);line-height:1.6}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
.khung{max-width:1120px;margin:0 auto;padding:0 20px}
.bai{max-width:740px;margin:0 auto;padding:0 20px}
.nhan{display:inline-block;background:var(--xanh-nhat);color:var(--xanh-dam);font-size:13px;font-weight:600;padding:6px 16px;border-radius:999px;margin-bottom:14px}
.nut{display:inline-block;padding:13px 28px;border-radius:10px;font-weight:600;font-size:15px;cursor:pointer;border:none;transition:.2s;text-align:center}
.nut-xanh{background:var(--xanh);color:#fff}
.nut-xanh:hover{background:var(--xanh-dam)}
.nut-vien{background:#fff;color:var(--xanh-dam);border:1.5px solid var(--xanh)}
.nut-vien:hover{background:var(--xanh-nhat)}

/* NAV */
nav{position:sticky;top:0;background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid #eee;z-index:50}
.nav-trong{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center}
.logo img{height:52px;width:auto;display:block}
.nav-links{display:flex;gap:24px;font-size:14px;font-weight:500;color:var(--xam)}
.nav-links a:hover,.nav-links a.dang-hoat{color:var(--xanh-dam)}
@media(max-width:820px){.nav-links{display:none}}

/* BREADCRUMB */
.duong-dan{font-size:13px;color:var(--xam);padding:18px 0}
.duong-dan a{color:var(--xanh-dam)}
.duong-dan a:hover{text-decoration:underline}

/* HERO BLOG LIST */
.blog-hero{background:linear-gradient(180deg,#EFF6FC 0%,#DCEBF7 60%,#fff 100%);text-align:center;padding:56px 0 48px}
.blog-hero h1{font-size:clamp(28px,5vw,42px);font-weight:800;line-height:1.25}
.blog-hero p{max-width:620px;margin:16px auto 0;color:var(--xam);font-size:16px}

/* GRID BÀI VIẾT */
.blog-luoi{display:grid;grid-template-columns:repeat(2,1fr);gap:26px;padding:56px 0 80px}
@media(max-width:720px){.blog-luoi{grid-template-columns:1fr}}
.blog-the{border:1px solid #E7EDF3;border-radius:16px;padding:26px;transition:.2s;background:#fff}
.blog-the:hover{border-color:var(--xanh-vien);box-shadow:0 14px 30px rgba(27,108,168,.10);transform:translateY(-2px)}
.blog-the .nhan{margin-bottom:12px}
.blog-the h2{font-size:20px;font-weight:800;line-height:1.35;margin-bottom:10px}
.blog-the p{color:var(--xam);font-size:14.5px;margin-bottom:16px}
.blog-the .doc-them{color:var(--xanh-dam);font-weight:600;font-size:14px}
.blog-the .doc-them:after{content:" →"}

/* BÀI VIẾT CHI TIẾT */
.bai-header{background:linear-gradient(180deg,#EFF6FC 0%,#fff 100%);padding:8px 0 44px}
.bai-header h1{font-size:clamp(26px,4.2vw,38px);font-weight:800;line-height:1.3;margin:14px 0 16px}
.bai-meta{font-size:13.5px;color:var(--xam)}
.bai-noidung{padding:8px 0 64px;font-size:16.5px;color:var(--den)}
.bai-noidung h2{font-size:24px;font-weight:800;margin:40px 0 16px;line-height:1.35}
.bai-noidung h3{font-size:19px;font-weight:700;margin:28px 0 12px}
.bai-noidung p{margin-bottom:16px;color:#2B3947}
.bai-noidung ul,.bai-noidung ol{margin:0 0 18px 22px;color:#2B3947}
.bai-noidung li{margin-bottom:8px}
.bai-noidung strong{color:var(--den)}
.bai-noidung table{width:100%;border-collapse:collapse;margin:8px 0 22px;font-size:14.5px}
.bai-noidung th,.bai-noidung td{border:1px solid #E7EDF3;padding:10px 12px;text-align:left}
.bai-noidung th{background:var(--xam-nhat);font-weight:700}
.tra-loi-nhanh{background:#fff;border-left:4px solid var(--xanh);padding:16px 22px;margin:24px 0 8px;border-radius:0 12px 12px 0;font-size:15.5px;color:#2B3947;box-shadow:0 8px 20px rgba(27,108,168,.08)}
.tra-loi-nhanh strong{color:var(--xanh-dam)}
.mini-faq{margin-top:36px}
.mini-faq h2{font-size:24px;font-weight:800;margin-bottom:8px}
.mini-faq-muc{border-bottom:1px solid #E7EDF3;padding:18px 0}
.mini-faq-muc:last-child{border-bottom:none}
.mini-faq-muc h3{font-size:16.5px;font-weight:700;margin-bottom:8px;color:var(--den)}
.mini-faq-muc p{color:#2B3947;margin-bottom:0;font-size:15px}
.bai-cta{background:var(--xanh-nhat);border:1px solid var(--xanh-vien);border-radius:16px;padding:28px;margin:36px 0;text-align:center}
.bai-cta h3{margin-top:0;font-size:20px}
.bai-cta p{color:var(--xam);margin-bottom:18px}
.bai-cta .nut-hang{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.lien-quan{background:var(--xam-nhat);padding:56px 0 64px}
.lien-quan h2{font-size:22px;font-weight:800;margin-bottom:24px;text-align:center}

/* FOOTER */
footer{background:#11202E;color:#9FB0C0;padding:54px 0 26px;margin-top:0}
.ft-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px}
@media(max-width:760px){.ft-grid{grid-template-columns:1fr 1fr}}
footer .logo{color:#fff;font-size:22px;font-weight:800}
footer .logo .xanh{color:#4FA8DC}
footer h5{color:#fff;font-size:14px;margin-bottom:14px}
footer a{display:block;font-size:14px;margin-bottom:9px;color:#A9BAC9}
footer a:hover{color:#4FA8DC}
.ft-duoi{border-top:1px solid #233340;margin-top:38px;padding-top:20px;font-size:12.5px;text-align:center;color:#6E7E8C}

@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}