/* ============================================================
   Tren Tay — he thiet ke
   Doi mau thuong hieu: sua --primary va --accent ben duoi
   ============================================================ */
:root{
  --bg:#f3f6ff;
  --panel:#ffffff;
  --panel-2:#f2f4f9;
  --text:#191536;
  --muted:#6b6788;
  --border:#e7e4f3;
  --primary:#1d4ed8;
  --primary-dark:#142b86;
  --accent:#4338ca;
  --success:#12a150;
  --danger:#e5484d;
  --radius:14px;
  --radius-sm:9px;
  --shadow:0 1px 2px rgba(16,24,40,.05), 0 8px 24px rgba(16,24,40,.06);
  --shadow-lg:0 12px 40px rgba(16,24,40,.12);
  --maxw:1200px;
  --font:"Be Vietnam Pro", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#0e1117; --panel:#161b25; --panel-2:#1d2331; --text:#e8ecf4;
    --muted:#98a2b8; --border:#262d3d; --primary:#7ea6ff; --primary-dark:#5b8cff; --accent:#8b93ff;
    --shadow:0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
    --shadow-lg:0 12px 40px rgba(0,0,0,.5);
  }
}
:root[data-theme="dark"]{
  --bg:#0e1117; --panel:#161b25; --panel-2:#1d2331; --text:#e8ecf4;
  --muted:#98a2b8; --border:#262d3d; --primary:#7ea6ff; --primary-dark:#5b8cff; --accent:#8b93ff;
  --shadow:0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.35);
  --shadow-lg:0 12px 40px rgba(0,0,0,.5);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; font-family:var(--font); background:var(--bg); color:var(--text);
  line-height:1.65; -webkit-font-smoothing:antialiased;
}
img{max-width:100%; display:block}
a{color:var(--primary); text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.25; margin:0 0 .5em; font-weight:700; letter-spacing:-.02em}
h1{font-size:clamp(2rem,5vw,3.1rem)}
h2{font-size:clamp(1.5rem,3vw,2.1rem)}
h3{font-size:1.15rem}
p{margin:0 0 1em}
.muted{color:var(--muted)}
.wrap{max-width:var(--maxw); margin:0 auto; padding:0 20px}
.center{text-align:center}
.hidden{display:none !important}

/* ---------- Header ---------- */
.site-header{
  position:sticky; top:0; z-index:50;
  background:color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter:blur(12px); border-bottom:1px solid var(--border);
}
.header-inner{display:flex; align-items:center; gap:20px; height:66px; max-width:var(--maxw); margin:0 auto; padding:0 20px}
.brand{display:flex; align-items:center; gap:10px; font-weight:800; font-size:1.15rem; color:var(--text); text-decoration:none; letter-spacing:-.03em}
.brand:hover{text-decoration:none}
.brand-mark{
  width:32px; height:32px; border-radius:9px; display:grid; place-items:center;
  background:linear-gradient(135deg,var(--primary),var(--accent)); color:#fff; font-size:1rem; font-weight:800;
}
.main-nav{display:flex; gap:4px; margin-left:auto}
.main-nav a{
  padding:8px 13px; border-radius:var(--radius-sm); color:var(--muted);
  font-size:.94rem; font-weight:500; transition:.15s;
}
.main-nav a:hover,.main-nav a.active{background:var(--panel-2); color:var(--text); text-decoration:none}
.header-right{display:flex; align-items:center; gap:8px}
.icon-btn{
  width:38px; height:38px; border-radius:var(--radius-sm); border:1px solid var(--border);
  background:var(--panel); color:var(--text); cursor:pointer; display:grid; place-items:center; font-size:1rem;
}
.icon-btn:hover{background:var(--panel-2)}
.nav-toggle{display:none}
.user-chip{display:flex; align-items:center; gap:8px; padding:4px 12px 4px 4px; border:1px solid var(--border); border-radius:999px; font-size:.88rem; font-weight:600}
.user-chip img{width:28px; height:28px; border-radius:50%}

/* ---------- Nut ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding:11px 22px; border-radius:var(--radius-sm); font-weight:600; font-size:.95rem;
  border:1px solid transparent; cursor:pointer; transition:.18s; white-space:nowrap;
  font-family:inherit;
}
.btn:hover{text-decoration:none; transform:translateY(-1px)}
.btn:disabled{opacity:.55; cursor:not-allowed; transform:none}
.btn-primary{background:var(--primary); color:#fff}
.btn-primary:hover{background:var(--primary-dark)}
.btn-ghost{background:var(--panel); color:var(--text); border-color:var(--border)}
.btn-ghost:hover{background:var(--panel-2)}
.btn-lg{padding:14px 28px; font-size:1.02rem}
.btn-block{width:100%}

/* ---------- Hero ---------- */
.hero{
  padding:80px 0 70px; text-align:center; position:relative; overflow:hidden;
  background:radial-gradient(900px 380px at 50% -10%, color-mix(in srgb,var(--primary) 14%, transparent), transparent 70%);
}
.hero .eyebrow{
  display:inline-block; padding:6px 14px; border-radius:999px; background:var(--panel);
  border:1px solid var(--border); font-size:.85rem; font-weight:600; color:var(--muted); margin-bottom:22px;
}
.hero p.lead{font-size:1.15rem; color:var(--muted); max-width:640px; margin:0 auto 32px}
.hero-cta{display:flex; gap:12px; justify-content:center; flex-wrap:wrap}
.hero-stats{display:flex; gap:40px; justify-content:center; margin-top:52px; flex-wrap:wrap}
.hero-stats div{text-align:center}
.hero-stats b{display:block; font-size:1.8rem; font-weight:800; letter-spacing:-.03em}
.hero-stats span{font-size:.88rem; color:var(--muted)}

/* ---------- Section ---------- */
.section{padding:64px 0}
.section-head{margin-bottom:34px}
.section-head.row{display:flex; align-items:end; justify-content:space-between; gap:20px; flex-wrap:wrap}
.section-head h2{margin-bottom:6px}
.section-head p{margin:0; color:var(--muted)}

/* ---------- Luoi ---------- */
.grid{display:grid; gap:22px}
.products-grid{grid-template-columns:repeat(auto-fit,minmax(290px,1fr))}
.posts-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.why-grid{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}

/* ---------- The san pham ---------- */
.card{
  background:var(--panel); border:1px solid var(--border); border-radius:var(--radius);
  overflow:hidden; box-shadow:var(--shadow); transition:.2s; display:flex; flex-direction:column;
}
.card:hover{transform:translateY(-3px); box-shadow:var(--shadow-lg); border-color:color-mix(in srgb,var(--primary) 40%, var(--border))}
.product-thumb{
  height:150px; display:grid; place-items:center; font-size:2.6rem;
  background:linear-gradient(135deg, color-mix(in srgb,var(--primary) 16%,transparent), color-mix(in srgb,var(--accent) 16%,transparent));
}
.card-body{padding:20px; display:flex; flex-direction:column; flex:1}
.product-title{font-size:1.1rem; font-weight:700; margin-bottom:6px}
.product-title a{color:var(--text)}
.product-sub{color:var(--muted); font-size:.92rem; margin-bottom:16px; flex:1}
.tag-row{display:flex; gap:6px; flex-wrap:wrap; margin-bottom:14px}
.tag{font-size:.76rem; padding:3px 9px; border-radius:999px; background:var(--panel-2); color:var(--muted); font-weight:600}
.price-row{display:flex; align-items:center; justify-content:space-between; gap:12px; padding-top:14px; border-top:1px solid var(--border)}
.price{font-weight:800; font-size:1.15rem; letter-spacing:-.02em}
.price small{display:block; font-weight:500; font-size:.78rem; color:var(--muted); text-decoration:line-through}
.badge-free{color:var(--success); font-weight:700}

/* ---------- The bai viet ---------- */
.post-thumb{height:132px; background:var(--panel-2); display:grid; place-items:center; font-size:2rem}
.post-title{font-weight:700; font-size:1.02rem; margin-bottom:6px}
.post-title a{color:var(--text)}
.post-excerpt{color:var(--muted); font-size:.9rem; margin-bottom:12px; flex:1}
.post-meta{font-size:.82rem}

/* ---------- Vi sao chon ---------- */
.why{
  background:var(--panel); border:1px solid var(--border); border-radius:var(--radius);
  padding:24px; text-align:center;
}
.why .ico{font-size:1.9rem; margin-bottom:10px}
.why h3{font-size:1rem; margin-bottom:6px}
.why p{font-size:.9rem; color:var(--muted); margin:0}

/* ---------- Dai CTA ---------- */
.cta-band{
  background:linear-gradient(135deg,var(--primary),var(--accent)); color:#fff;
  border-radius:var(--radius); padding:48px 30px; text-align:center; margin:20px 0;
}
.cta-band h2{color:#fff}
.cta-band p{color:rgba(255,255,255,.9); max-width:560px; margin:0 auto 24px}
.cta-band .btn-ghost{background:#fff; color:var(--primary-dark); border-color:#fff}

/* ---------- Trang noi dung ---------- */
.page-head{padding:52px 0 26px; border-bottom:1px solid var(--border); margin-bottom:40px}
.page-head h1{margin-bottom:8px}
.page-head p{color:var(--muted); margin:0; max-width:680px}
.article{max-width:760px; margin:0 auto}
.article h2{margin-top:1.8em}
.article ul,.article ol{padding-left:22px}
.article li{margin-bottom:.4em}
.article code{background:var(--panel-2); padding:2px 6px; border-radius:5px; font-size:.9em}
.article blockquote{border-left:3px solid var(--primary); margin:1.4em 0; padding:2px 0 2px 18px; color:var(--muted)}
.callout{background:var(--panel); border:1px solid var(--border); border-left:3px solid var(--primary); border-radius:var(--radius-sm); padding:16px 20px; margin:1.6em 0}
.callout p:last-child{margin:0}
table{width:100%; border-collapse:collapse; margin:1.4em 0; font-size:.94rem}
th,td{padding:11px 13px; border-bottom:1px solid var(--border); text-align:left}
th{font-weight:700; background:var(--panel-2)}
.table-wrap{overflow-x:auto}
.crumb{font-size:.88rem; color:var(--muted); margin-bottom:14px}

/* ---------- Chi tiet san pham ---------- */
.product-hero{display:grid; grid-template-columns:1.15fr .85fr; gap:44px; align-items:start; padding:48px 0}
.buy-box{background:var(--panel); border:1px solid var(--border); border-radius:var(--radius); padding:24px; box-shadow:var(--shadow); position:sticky; top:90px}
.buy-box .price{font-size:2rem; margin-bottom:4px}
.spec-list{list-style:none; padding:0; margin:0 0 20px}
.spec-list li{padding:9px 0; border-bottom:1px solid var(--border); font-size:.92rem; display:flex; justify-content:space-between; gap:14px}
.spec-list li:last-child{border-bottom:0}
.spec-list b{font-weight:600}
.feat-list{list-style:none; padding:0; margin:0}
.feat-list li{padding-left:28px; position:relative; margin-bottom:11px}
.feat-list li::before{content:"\2713"; position:absolute; left:0; top:0; color:var(--success); font-weight:800}

/* ---------- Hop thoai thu lead ---------- */
.modal-backdrop{
  position:fixed; inset:0; background:rgba(9,12,20,.62); backdrop-filter:blur(4px);
  display:grid; place-items:center; padding:20px; z-index:100;
}
.modal{
  background:var(--panel); border:1px solid var(--border); border-radius:var(--radius);
  box-shadow:var(--shadow-lg); width:100%; max-width:420px; padding:28px; position:relative;
  max-height:90vh; overflow-y:auto;
}
.modal h3{margin-bottom:6px; font-size:1.3rem}
.modal .sub{color:var(--muted); font-size:.92rem; margin-bottom:22px}
.modal-close{position:absolute; top:14px; right:14px; background:none; border:0; font-size:1.4rem; color:var(--muted); cursor:pointer; line-height:1; padding:4px}
.step{display:flex; align-items:center; gap:8px; margin-bottom:20px; font-size:.82rem; color:var(--muted)}
.step i{width:26px; height:26px; border-radius:50%; background:var(--panel-2); display:grid; place-items:center; font-style:normal; font-weight:700; font-size:.8rem}
.step i.on{background:var(--primary); color:#fff}
.step hr{flex:1; border:0; border-top:1px solid var(--border); margin:0}
.field{margin-bottom:16px}
.field label{display:block; font-size:.88rem; font-weight:600; margin-bottom:6px}
.field input{
  width:100%; padding:11px 14px; border:1px solid var(--border); border-radius:var(--radius-sm);
  background:var(--bg); color:var(--text); font-size:.98rem; font-family:inherit;
}
.field input:focus{outline:2px solid color-mix(in srgb,var(--primary) 45%, transparent); outline-offset:1px; border-color:var(--primary)}
.field .err{color:var(--danger); font-size:.83rem; margin-top:5px; display:none}
.field.invalid .err{display:block}
.field.invalid input{border-color:var(--danger)}
.consent{display:flex; gap:9px; align-items:flex-start; font-size:.83rem; color:var(--muted); margin-bottom:18px}
.consent input{margin-top:3px; flex-shrink:0}
.gbtn-wrap{display:grid; place-items:center; margin-bottom:18px; min-height:44px}
.divider{display:flex; align-items:center; gap:12px; color:var(--muted); font-size:.82rem; margin:18px 0}
.divider::before,.divider::after{content:""; flex:1; border-top:1px solid var(--border)}
.ok-icon{font-size:2.6rem; text-align:center; margin-bottom:10px}

/* ---------- Footer ---------- */
.site-footer{background:var(--panel); border-top:1px solid var(--border); margin-top:70px; padding:52px 0 26px}
.footer-grid{display:grid; grid-template-columns:1.6fr repeat(3,1fr); gap:34px; margin-bottom:34px}
.footer-grid h4{font-size:.88rem; text-transform:uppercase; letter-spacing:.06em; color:var(--muted); margin-bottom:14px}
.footer-grid ul{list-style:none; padding:0; margin:0}
.footer-grid li{margin-bottom:9px}
.footer-grid a{color:var(--text); font-size:.93rem}
.footer-brand p{font-size:.92rem; color:var(--muted); max-width:300px}
.footer-bottom{border-top:1px solid var(--border); padding-top:22px; display:flex; justify-content:space-between; gap:16px; flex-wrap:wrap; font-size:.88rem; color:var(--muted)}

/* ---------- Di dong ---------- */
@media (max-width:880px){
  .product-hero{grid-template-columns:1fr; gap:28px}
  .buy-box{position:static}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  .nav-toggle{display:grid}
  .main-nav{
    position:fixed; inset:66px 0 auto 0; flex-direction:column; gap:0; background:var(--panel);
    border-bottom:1px solid var(--border); padding:10px 16px 18px; display:none; box-shadow:var(--shadow-lg);
  }
  .main-nav.open{display:flex}
  .main-nav a{padding:12px 10px; font-size:1rem}
  .hero{padding:56px 0 48px}
  .hero-stats{gap:26px}
  .section{padding:46px 0}
}
@media (max-width:480px){
  .footer-grid{grid-template-columns:1fr}
  .hero-cta .btn{width:100%}
}

/* ============================================================
   LOP GIAO DIEN MOI — hoc theo bo cuc sonautotool.com
   Header hai tang · hero co anh · dai so lieu · the san pham
   co anh bia · khoi blog noi bat · dai CTA
   ============================================================ */

/* ---------- Header ---------- */
/* Cac lop .topbar* ben duoi hien KHONG duoc trang nao dung.
   Giu lai phong khi muon bat lai thanh tien ich mau tim o tren cung. */
.site-header{background:none; backdrop-filter:none; border-bottom:none; transition:box-shadow .2s ease}
.site-header.scrolled{box-shadow:0 6px 22px rgba(23,20,58,.11)}

.topbar{background:linear-gradient(90deg,var(--primary-dark) 0%,var(--primary) 55%,var(--accent) 100%); color:#fff}
.topbar-inner{max-width:var(--maxw); margin:0 auto; padding:8px 20px; display:flex; align-items:center; gap:14px}
.topbar-support{
  display:inline-flex; align-items:center; gap:7px; background:#f59e0b; color:#3a2500;
  font-weight:700; font-size:.83rem; padding:7px 15px; border-radius:8px;
  box-shadow:0 4px 12px rgba(245,158,11,.35);
}
.topbar-support:hover{background:#fbbf24; color:#3a2500; text-decoration:none}
.topbar-right{margin-left:auto; display:flex; align-items:center; gap:10px}
.topbar-search{display:flex}
.topbar-search input{
  border:none; outline:none; font:inherit; font-size:.85rem; padding:8px 13px;
  border-radius:8px 0 0 8px; width:220px; background:#fff; color:#191536;
}
.topbar-search input::placeholder{color:#9a97ad}
.topbar-search button{
  border:none; background:#f59e0b; color:#fff; padding:0 14px;
  border-radius:0 8px 8px 0; cursor:pointer; font-size:.9rem;
}
.topbar-search button:hover{background:#fbbf24}
.topbar #authBox{display:flex; gap:8px; align-items:center}
.topbar .btn{border-radius:8px; font-weight:700}
.topbar .btn:hover{transform:none}
.topbar .btn-ghost{background:rgba(255,255,255,.16); border:1px solid rgba(255,255,255,.42); color:#fff}
.topbar .btn-ghost:hover{background:rgba(255,255,255,.28)}
.topbar .btn-primary{background:#f59e0b; border:1px solid #f59e0b; color:#3a2500; box-shadow:0 4px 12px rgba(245,158,11,.4)}
.topbar .btn-primary:hover{background:#fbbf24}
.topbar .btn-sm{padding:6px 13px; font-size:.82rem}
.topbar .icon-btn{
  width:34px; height:34px; background:rgba(255,255,255,.16);
  border:1px solid rgba(255,255,255,.42); color:#fff; border-radius:8px;
}
.topbar .icon-btn:hover{background:rgba(255,255,255,.28)}
.topbar .user-chip{color:#fff; border-color:rgba(255,255,255,.5); background:rgba(255,255,255,.16)}
.topbar .user-chip:hover{text-decoration:none; background:rgba(255,255,255,.28)}
.topbar .user-chip .avatar{
  width:26px; height:26px; border-radius:50%; display:grid; place-items:center;
  background:#fff; color:var(--primary-dark); font-weight:800; font-size:.78rem;
}

.mainbar{background:var(--panel); border-bottom:1px solid var(--border); position:relative}
.mainbar .header-inner{height:auto; padding:10px 20px; gap:24px}
.mainbar .main-nav{margin-left:0}
.mainbar .main-nav a{font-weight:700; font-size:.9rem; padding:9px 13px; color:var(--text)}
.mainbar .main-nav a:hover,
.mainbar .main-nav a.active{background:color-mix(in srgb,var(--primary) 12%,transparent); color:var(--primary-dark)}
.mainbar .nav-toggle{margin-left:auto}
.brand-logo{
  width:36px; height:36px; border-radius:11px; display:grid; place-items:center;
  background:linear-gradient(135deg,var(--primary),var(--accent)); color:#fff;
  font-weight:800; font-size:1.15rem; box-shadow:0 6px 15px rgba(29,78,216,.42);
}

/* ---------- Hero co anh minh hoa ---------- */
.hero2{
  color:#fff; overflow:hidden;
  background:
    radial-gradient(1100px 480px at 12% -12%, rgba(99,140,255,.62), transparent 58%),
    radial-gradient(900px 500px at 100% 0%, rgba(34,211,238,.34), transparent 56%),
    linear-gradient(130deg,#0b1f6b 0%,#1b3fc4 48%,#3730a3 100%);
}
.hero2-inner{
  max-width:var(--maxw); margin:0 auto; padding:58px 20px 62px;
  display:grid; grid-template-columns:1.05fr .95fr; gap:44px; align-items:center;
}
.hero2 .eyebrow{
  display:inline-block; background:rgba(255,255,255,.14); border:1px solid rgba(255,255,255,.28);
  color:#fff; font-size:.76rem; font-weight:700; letter-spacing:.5px;
  padding:5px 13px; border-radius:30px; text-transform:uppercase;
}
.hero2-copy h1{font-size:clamp(1.9rem,4vw,2.7rem); line-height:1.12; margin:16px 0 14px; font-weight:800; text-wrap:balance}
.hero2-copy h1 .hl{color:#fde047}
.hero2-copy p{font-size:1.06rem; line-height:1.62; opacity:.93; max-width:520px; margin:0}
.hero2-cta{display:flex; gap:12px; margin:24px 0 20px; flex-wrap:wrap}
.hero2-cta .btn-light{background:#fff; color:var(--primary-dark); border-color:#fff}
.hero2-cta .btn-outline{background:transparent; border:1.5px solid rgba(255,255,255,.7); color:#fff}
.hero2-cta .btn-outline:hover{background:rgba(255,255,255,.14)}
.hero2-trust{display:flex; gap:20px; flex-wrap:wrap; font-size:.85rem; opacity:.93; font-weight:600}
.hero2-art{display:flex; justify-content:center}
.hero2-art svg{width:100%; max-width:500px; height:auto; display:block}

/* ---------- Dai so lieu ---------- */
.statsband{background:var(--panel); border-bottom:1px solid var(--border)}
.stats-inner{max-width:var(--maxw); margin:0 auto; padding:24px 20px; display:grid; grid-template-columns:repeat(4,1fr); gap:20px}
.stat{text-align:center}
.stat b{display:block; font-size:1.7rem; font-weight:800; color:var(--primary-dark); line-height:1.1}
.stat span{color:var(--muted); font-size:.85rem}

/* ---------- Dau muc ---------- */
.section-head .section-sub{color:var(--muted); font-size:.92rem; margin:5px 0 0}
.seeall{font-weight:700; white-space:nowrap}

/* ---------- The san pham co anh bia ---------- */
.product-card{display:flex; flex-direction:column; padding:0; overflow:hidden; transition:transform .12s, box-shadow .12s}
.product-card:hover{transform:translateY(-3px); box-shadow:var(--shadow-lg)}
.pcard-hero{aspect-ratio:400/190; background:var(--panel-2)}
.pcard-hero svg,.pcard-hero img{display:block; width:100%; height:100%}
.product-card .card-body{padding:15px 17px 17px; display:flex; flex-direction:column; flex:1}
.product-card .price-row{margin-top:auto}

/* ---------- Khoi "Vi sao chon" ---------- */
.feature-card{
  background:var(--panel); border:1px solid var(--border); border-radius:var(--radius);
  box-shadow:var(--shadow); padding:22px 20px; transition:transform .14s, box-shadow .14s;
}
.feature-card:hover{transform:translateY(-3px); box-shadow:var(--shadow-lg)}
.feature-ic{
  display:inline-flex; align-items:center; justify-content:center; width:46px; height:46px;
  border-radius:13px; font-size:1.4rem; margin-bottom:13px; box-shadow:0 7px 16px rgba(20,43,134,.3);
}
.feature-card h3{font-size:1rem; margin:0 0 6px}
.feature-card p{color:var(--muted); font-size:.88rem; margin:0; line-height:1.55}

/* ---------- Khoi blog: bai noi bat + cot ben ---------- */
.blog2-grid{display:grid; grid-template-columns:1.4fr 1fr; gap:24px; align-items:start}
.blog2-feature{
  display:flex; flex-direction:column; background:var(--panel); border:1px solid var(--border);
  border-radius:var(--radius); overflow:hidden; box-shadow:var(--shadow); color:var(--text);
  transition:transform .14s, box-shadow .14s;
}
.blog2-feature:hover{transform:translateY(-3px); box-shadow:var(--shadow-lg); text-decoration:none}
.bf-thumb{
  height:232px; background:linear-gradient(135deg,#dbeafe,#e0f2fe);
  display:flex; align-items:center; justify-content:center; font-size:3.2rem; overflow:hidden;
}
.bf-thumb img,.bf-thumb svg{width:100%; height:100%; object-fit:cover}
.bf-body{padding:18px 20px 20px; display:flex; flex-direction:column; gap:9px}
.bf-title{font-size:1.3rem; font-weight:800; line-height:1.28}
.bf-excerpt{color:var(--muted); font-size:.92rem; line-height:1.55}
.badge-violet{
  display:inline-block; align-self:flex-start; border-radius:20px; padding:3px 11px;
  font-size:.72rem; font-weight:700;
  background:color-mix(in srgb,var(--primary) 15%,transparent); color:var(--primary-dark);
}
.blog2-side{display:flex; flex-direction:column; gap:18px}
.side-block{background:var(--panel); border:1px solid var(--border); border-radius:var(--radius); box-shadow:var(--shadow); padding:15px 18px 16px}
.side-block h4{margin:0 0 12px; font-size:.76rem; text-transform:uppercase; letter-spacing:.6px; color:var(--muted)}
.blogrow{display:flex; gap:12px; align-items:center; padding:9px 0; border-top:1px solid var(--border); color:var(--text)}
.blogrow:hover{text-decoration:none}
.blogrow:hover .blogrow-title{color:var(--primary)}
.side-block .blogrow:first-of-type{border-top:none; padding-top:0}
.blogrow-thumb{
  flex:0 0 54px; width:54px; height:54px; border-radius:10px;
  background:linear-gradient(135deg,#dbeafe,#e0f2fe); display:flex; align-items:center;
  justify-content:center; font-size:1.35rem; overflow:hidden;
}
.blogrow-txt{display:flex; flex-direction:column; gap:3px; min-width:0}
.blogrow-title{font-weight:700; font-size:.9rem; line-height:1.35}
.blogrow-meta{font-size:.78rem}
.side-popular ol{margin:0; padding:0; list-style:none; counter-reset:pop}
.side-popular li{counter-increment:pop; padding:8px 0; border-top:1px solid var(--border); display:flex; gap:10px; align-items:baseline}
.side-popular li:first-child{border-top:none; padding-top:0}
.side-popular li::before{content:counter(pop); font-weight:800; color:var(--primary)}
.side-popular a{color:var(--text); font-size:.87rem; font-weight:600; line-height:1.4}
.side-popular a:hover{color:var(--primary)}

/* ---------- Dai CTA cuoi trang ---------- */
.ctaband{background:linear-gradient(120deg,var(--primary-dark),var(--primary) 55%,var(--accent)); color:#fff; margin-top:36px}
.ctaband-inner{max-width:var(--maxw); margin:0 auto; padding:42px 20px; display:flex; align-items:center; justify-content:space-between; gap:24px; flex-wrap:wrap}
.ctaband h2{margin:0 0 6px; font-size:1.5rem; color:#fff}
.ctaband p{margin:0; opacity:.92; max-width:620px}
.ctaband .btn-light{background:#fff; color:var(--primary-dark); border-color:#fff}

/* ---------- Dai tieu de trang trong ---------- */
.page-head{
  background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 9%,var(--panel)),color-mix(in srgb,var(--primary) 9%,var(--panel)));
  padding:34px 0 30px; margin-bottom:34px;
}

/* ---------- Chan trang ---------- */
.site-footer{margin-top:0; padding:34px 0 0}
.footer-bottom{justify-content:center; text-align:center}

/* ---------- Di dong ---------- */
@media (max-width:900px){
  .hero2-inner{grid-template-columns:1fr; gap:30px; padding:44px 20px 48px}
  .hero2-art{order:2; max-width:440px; margin:0 auto}
  .blog2-grid{grid-template-columns:1fr}
  .stats-inner{grid-template-columns:repeat(2,1fr); row-gap:22px}
  .ctaband-inner{flex-direction:column; align-items:flex-start}
}
@media (max-width:760px){
  .mainbar .main-nav{position:absolute; inset:auto 0 auto 0; top:100%}
  .topbar-search{display:none}
  .topbar-support .support-text{display:none}
  .topbar-support{padding:7px 11px}
  .topbar-inner{padding:7px 16px}
  .mainbar .header-inner{padding:8px 16px}
}

/* Don vi chu ky trong o gia — khong gach ngang nhu gia so sanh */
.price small.ky{text-decoration:none}
.btn-sm{padding:7px 14px; font-size:.88rem}

/* Luoi san pham: du 4 cot tren man hinh rong nhu trang mau */
.products-grid{grid-template-columns:repeat(auto-fill,minmax(265px,1fr))}
@media (max-width:1160px){.products-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}}

/* Ket qua tim kiem it bai: giu the dung ben trai, khong keo gian het hang */
.posts-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}

/* Nen tim o che do toi nhat hon nen chu phai dam mau */
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]) .btn-primary{color:#1b1035}
  :root:not([data-theme="light"]) .topbar .btn-primary{color:#3a2500}
}
:root[data-theme="dark"] .btn-primary{color:#1b1035}
:root[data-theme="dark"] .topbar .btn-primary{color:#3a2500}

/* ---------- Header mot tang: logo + menu + nut tai khoan ---------- */
.site-header{background:var(--panel)}
.mainbar .header-right{margin-left:auto; gap:8px}
.mainbar .nav-toggle{margin-left:0}
.mainbar .header-inner{padding:12px 20px}
.mainbar .header-right .btn-sm{padding:7px 15px}
.user-chip .avatar{
  width:28px; height:28px; border-radius:50%; display:grid; place-items:center;
  background:linear-gradient(135deg,var(--primary),var(--accent)); color:#fff;
  font-weight:800; font-size:.8rem;
}
@media (max-width:760px){
  .mainbar .header-inner{padding:10px 16px}
}

/* ============================================================
   HE THONG KHOA HOC — the khoa, trang hoc, tien do
   ============================================================ */

/* Thanh tien do tren the khoa va o cot ben */
.tien-do{height:6px; border-radius:999px; background:var(--panel-2); overflow:hidden; margin:2px 0 6px}
.tien-do-thanh{height:100%; width:0; border-radius:999px; background:linear-gradient(90deg,var(--primary),var(--accent))}

/* Bo cuc trang hoc: cot bai ben trai, khung xem ben phai */
.hoc-layout{display:grid; grid-template-columns:320px 1fr; gap:24px; align-items:start; padding-bottom:60px}
.hoc-side{position:sticky; top:88px}
.hoc-side .side-block{padding:18px 18px 20px}

/* Danh sach bai */
.bai-list{list-style:none; margin:0; padding:0; max-height:60vh; overflow:auto}
.bai-item{
  display:flex; gap:11px; align-items:flex-start; padding:10px 10px; border-radius:10px;
  cursor:pointer; transition:background .14s;
}
.bai-item:hover{background:var(--panel-2)}
.bai-item.dang-hoc{background:color-mix(in srgb,var(--primary) 12%,transparent)}
.bai-item.dang-hoc .bai-ten{color:var(--primary-dark)}
.bai-dau{
  flex:0 0 26px; width:26px; height:26px; border-radius:50%; display:grid; place-items:center;
  background:var(--panel-2); color:var(--muted); font-size:.8rem; font-weight:700;
}
.bai-item.da-xong .bai-dau{background:var(--success); color:#fff}
.bai-item.dang-hoc .bai-dau{background:var(--primary); color:#fff}
.bai-txt{display:flex; flex-direction:column; gap:2px; min-width:0}
.bai-ten{font-weight:600; font-size:.92rem; line-height:1.35}
.bai-item.da-xong .bai-ten{color:var(--muted)}

/* Khung video */
.video-khung{aspect-ratio:16/9; background:#0b1020}
.video-khung iframe{width:100%; height:100%; border:0; display:block}
.video-cho{
  height:100%; display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:8px; text-align:center; background:var(--panel-2); padding:20px;
}
.video-cho p{margin:0; font-size:.92rem}
.video-cho code{background:var(--panel); padding:2px 6px; border-radius:6px; font-size:.85rem}

@media (max-width:900px){
  .hoc-layout{grid-template-columns:1fr}
  .hoc-side{position:static; order:2}
  .bai-list{max-height:none}
}

/* ---------- Thong tin phap ly chu so huu (Nghi dinh TMDT) ---------- */
.footer-legal{flex-basis:100%; font-size:.82rem; line-height:1.7; color:var(--muted); opacity:.92}
.footer-legal a{color:inherit; text-decoration:underline}
.legal-strip{max-width:820px; margin:36px auto 0; padding:22px 20px 30px; border-top:1px solid var(--border);
  font-size:.82rem; line-height:1.7; color:var(--muted); text-align:center}
.legal-strip a{color:inherit; text-decoration:underline}

/* Nut "Cong dong" tren thanh tim — dan sang nhom Facebook */
.topbar-community{
  display:inline-flex; align-items:center; gap:7px;
  background:rgba(255,255,255,.16); border:1px solid rgba(255,255,255,.42); color:#fff;
  font-weight:700; font-size:.83rem; padding:6px 14px; border-radius:8px;
}
.topbar-community:hover{background:rgba(255,255,255,.3); color:#fff; text-decoration:none}
@media (max-width:760px){
  .topbar-community{padding:6px 10px}
}