:root{
  --navy:#277714; --navy2:#2f8a1c; --gold:#28a54a; --gold-d:#1f8a3c; --gold-l:#e6f4e9; --dark:#1a520d;
  --ink:#1c2a1f; --muted:#56665a; --line:#dfe8e1; --bg:#f7faf7; --card:#fff;
  --ok:#1f7a4d; --err:#b3261e; --r:16px; --shadow:0 8px 28px rgba(20,60,20,.08);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Be Vietnam Pro",system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;font-size:16px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
.wrap{width:min(1180px,100% - 32px);margin-inline:auto}
h1,h2,h3{line-height:1.2;color:var(--navy)}
h2{font-size:clamp(26px,3.4vw,36px);font-weight:800;letter-spacing:-.01em}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:13px;font-weight:700;letter-spacing:.2em;text-transform:uppercase;color:var(--gold-d)}
.eyebrow::before{content:"";width:32px;height:2px;background:var(--gold)}
.muted{color:var(--muted)}
.section{padding:72px 0}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;flex-wrap:wrap;margin-bottom:32px}
.section-head p{max-width:560px;margin-top:8px}

/* nút */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 26px;border-radius:999px;font-weight:700;border:0;cursor:pointer;transition:.2s;white-space:nowrap}
.btn-gold{background:var(--gold);color:#fff} .btn-gold:hover{background:#23913f}
.btn-navy{background:var(--navy);color:#fff} .btn-navy:hover{background:var(--navy2)}
.btn-ghost{background:transparent;border:1.5px solid currentColor}
.btn-sm{padding:9px 16px;font-size:14px}
.btn:disabled{opacity:.5;cursor:not-allowed}

/* header */
.topbar{background:var(--navy);color:#d6ecd8;font-size:13px}
.topbar .wrap{display:flex;justify-content:center;gap:28px;padding:8px 0;flex-wrap:wrap}
.topbar b{color:var(--gold-l);font-weight:600}
@media (max-width:640px){.topbar span:not(:first-child){display:none}}
header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
header.site .wrap{display:flex;align-items:center;gap:24px;height:70px}
.logo{display:flex;flex-direction:column;line-height:1}
.logo b{font-size:21px;font-weight:800;color:var(--navy);letter-spacing:.02em}
.logo small{font-size:11px;color:var(--gold-d);letter-spacing:.18em;font-weight:600;margin-top:4px}
nav.main{display:flex;gap:4px;margin-left:auto}
nav.main a{padding:8px 14px;border-radius:999px;font-weight:600;font-size:15px;color:var(--ink)}
nav.main a:hover,nav.main a.on{background:var(--gold-l);color:var(--navy)}
.cart-btn{position:relative;display:grid;place-items:center;width:44px;height:44px;border-radius:50%;background:var(--navy);color:#fff}
.cart-btn span{position:absolute;top:-4px;right:-4px;min-width:20px;height:20px;padding:0 5px;border-radius:10px;background:var(--gold);color:#fff;font-size:12px;font-weight:800;display:grid;place-items:center}
.menu-btn{display:none;background:none;border:0;width:44px;height:44px;cursor:pointer}
@media (max-width:900px){
  nav.main{position:fixed;inset:70px 0 auto 0;flex-direction:column;background:var(--bg);padding:12px 16px 20px;border-bottom:1px solid var(--line);display:none;margin:0}
  nav.main.open{display:flex}
  nav.main a{padding:12px 14px}
  .menu-btn{display:grid;place-items:center;margin-left:auto}
  header.site .wrap{gap:8px}
}

/* hero */
.hero{position:relative;overflow:hidden;background:linear-gradient(135deg,#f4fbf5 0%,#dcefe0 100%)}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;padding:72px 0 80px}
.hero h1{font-size:clamp(34px,4.6vw,56px);font-weight:800;letter-spacing:-.02em;margin:14px 0 18px}
.hero h1 em{font-style:italic;color:var(--gold-d)}
.hero p.lead{font-size:18px;color:var(--muted);max-width:520px}
.hero .cta{display:flex;gap:12px;margin-top:28px;flex-wrap:wrap}
.hero-art{position:relative}
.hero-art .chip{position:absolute;background:#fff;border-radius:14px;padding:12px 16px;box-shadow:var(--shadow);font-weight:700;font-size:14px;color:var(--navy)}
.hero-art .chip small{display:block;font-weight:500;color:var(--muted);font-size:12px}
@media (max-width:900px){.hero .wrap{grid-template-columns:1fr;padding:44px 0 56px}.hero-art{order:-1}}

/* cam kết */
.promise{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:-40px;position:relative;z-index:2}
.promise div{background:var(--card);border-radius:var(--r);padding:22px;box-shadow:var(--shadow);display:flex;gap:14px;align-items:center}
.promise .ic{flex:0 0 48px;height:48px;border-radius:50%;background:var(--gold-l);display:grid;place-items:center;color:var(--gold-d)}
.promise b{display:block;color:var(--navy)}
.promise small{color:var(--muted);font-size:13px}
@media (max-width:900px){.promise{grid-template-columns:1fr 1fr;margin-top:-28px}}
@media (max-width:520px){.promise{grid-template-columns:1fr}}

/* lưới sản phẩm */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:22px}
.card{background:var(--card);border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;transition:.25s}
.card:hover{transform:translateY(-4px);box-shadow:0 14px 36px rgba(20,60,20,.14)}
.card .pic{aspect-ratio:4/3;background:#eef5ef;position:relative}
.card .pic img,.card .pic svg{width:100%;height:100%;object-fit:cover}
.card .tag{position:absolute;top:12px;left:12px;background:var(--navy);color:#fff;font-size:12px;font-weight:700;padding:5px 12px;border-radius:999px}
.card .tag.foam{background:#fff;color:var(--navy)}
.card .body{padding:18px 20px 20px;display:flex;flex-direction:column;gap:8px;flex:1}
.card h3{font-size:18px}
.card p{font-size:14px;color:var(--muted);flex:1}
.card .price{font-weight:800;color:var(--gold-d);font-size:19px}
.card .pol{font-size:12.5px;color:var(--navy2);background:#eaf6ec;border-radius:8px;padding:6px 10px}

/* tabs */
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}
.tabs a{padding:9px 18px;border-radius:999px;border:1.5px solid var(--line);font-weight:600;font-size:15px;background:#fff}
.tabs a.on{background:var(--navy);border-color:var(--navy);color:#fff}

/* trang sản phẩm */
.pd{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;padding:40px 0 72px;align-items:start}
.pd .gallery{border-radius:20px;overflow:hidden;background:#eef5ef;box-shadow:var(--shadow);aspect-ratio:4/3;position:sticky;top:90px}
.pd .gallery img,.pd .gallery svg{width:100%;height:100%;object-fit:cover}
.pd h1{font-size:clamp(28px,3.6vw,40px);font-weight:800;margin:10px 0}
.pd .price{font-size:28px;font-weight:800;color:var(--gold-d);margin:6px 0 4px}
.opt{margin-top:22px}
.opt label{display:block;font-weight:700;font-size:14px;margin-bottom:8px;color:var(--navy)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips button{padding:9px 14px;border-radius:10px;border:1.5px solid var(--line);background:#fff;cursor:pointer;font-weight:600;font-size:14px}
.chips button.on{border-color:var(--navy);background:var(--navy);color:#fff}
.qty{display:inline-flex;align-items:center;border:1.5px solid var(--line);border-radius:999px;background:#fff}
.qty button{width:40px;height:42px;border:0;background:none;font-size:20px;cursor:pointer}
.qty input{width:44px;text-align:center;border:0;font-weight:700;background:none}
.buy{display:flex;gap:12px;align-items:center;margin-top:26px;flex-wrap:wrap}
.policy-box{margin-top:26px;border-radius:14px;background:#fff;border:1px solid var(--line);padding:18px 20px;display:grid;gap:10px}
.policy-box div{display:flex;gap:10px;align-items:flex-start;font-size:15px}
.policy-box svg{flex:0 0 22px;color:var(--gold-d);margin-top:2px}
.features{margin-top:22px;display:grid;gap:8px}
.features li{list-style:none;padding-left:26px;position:relative}
.features li::before{content:"";position:absolute;left:4px;top:9px;width:9px;height:9px;border-radius:50%;background:var(--gold)}
.note{font-size:13.5px;color:var(--muted);margin-top:10px}
@media (max-width:900px){.pd{grid-template-columns:1fr;gap:28px}.pd .gallery{position:static}}

/* giỏ hàng */
.cart{display:grid;grid-template-columns:1.3fr 1fr;gap:32px;padding:40px 0 72px;align-items:start}
.panel{background:#fff;border-radius:var(--r);box-shadow:var(--shadow);padding:24px}
.cart-item{display:grid;grid-template-columns:84px 1fr auto;gap:16px;padding:16px 0;border-bottom:1px solid var(--line);align-items:center}
.cart-item:last-child{border-bottom:0}
.cart-item .thumb{width:84px;height:64px;border-radius:10px;overflow:hidden;background:#eef5ef}
.cart-item .thumb svg,.cart-item .thumb img{width:100%;height:100%;object-fit:cover}
.cart-item h4{font-size:16px;color:var(--navy)}
.cart-item .meta{font-size:13px;color:var(--muted)}
.cart-item .right{text-align:right;display:grid;gap:8px;justify-items:end}
.link-del{background:none;border:0;color:var(--err);font-size:13px;cursor:pointer;text-decoration:underline}
.sum{display:flex;justify-content:space-between;padding:10px 0;font-size:15px}
.sum.total{font-size:20px;font-weight:800;color:var(--navy);border-top:1px solid var(--line);margin-top:6px;padding-top:16px}
form .row{display:grid;gap:6px;margin-bottom:14px}
form .row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
form label{font-weight:600;font-size:14px}
form input,form select,form textarea{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;background:#fff}
form input:focus,form select:focus,form textarea:focus{outline:none;border-color:var(--gold)}
.radio{display:flex;gap:10px;align-items:center;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;cursor:pointer;font-weight:600}
.radio input{width:auto}
.hp{position:absolute;left:-9999px}
.msg{padding:14px 16px;border-radius:12px;font-weight:600;margin-top:12px}
.msg.ok{background:#e5f4ec;color:var(--ok)} .msg.err{background:#fbeaea;color:var(--err)}
.empty{text-align:center;padding:56px 20px}
@media (max-width:900px){.cart{grid-template-columns:1fr}form .row2{grid-template-columns:1fr}}

/* bảng / nội dung */
.prose{max-width:820px}
.prose h2{margin:40px 0 14px;font-size:26px}
.prose h3{margin:24px 0 8px;font-size:19px}
.prose p,.prose li{margin-bottom:10px}
.prose ul{padding-left:22px}
table.t{width:100%;border-collapse:collapse;background:#fff;border-radius:12px;overflow:hidden;box-shadow:var(--shadow);margin:12px 0 20px;font-size:15px}
table.t th,table.t td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
table.t th{background:var(--navy);color:#fff;font-weight:700}
.tbl-scroll{overflow-x:auto}
.callout{background:var(--gold-l);border-left:4px solid var(--gold);padding:14px 18px;border-radius:10px;margin:16px 0}

/* khối 2 cột */
.split{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
@media (max-width:900px){.split{grid-template-columns:1fr}}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.compare div{background:#fff;border-radius:14px;padding:20px;box-shadow:var(--shadow)}
.compare div.good{border-top:4px solid var(--gold)}
.compare div.bad{border-top:4px solid #c8cdd3}
.compare h4{color:var(--navy);margin-bottom:8px}
.compare li{list-style:none;font-size:14.5px;margin-bottom:6px}
@media (max-width:520px){.compare{grid-template-columns:1fr}}

.band{background:var(--navy);color:#fff;border-radius:24px;padding:48px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.band h2{color:#fff}
.band p{color:#d6ecd8}

/* footer */
footer.site{background:var(--dark);color:#d6ecd8;padding:56px 0 24px;margin-top:40px;font-size:14.5px}
footer.site .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:32px}
footer.site h4{color:#fff;margin-bottom:12px;font-size:16px}
footer.site a:hover{color:var(--gold-l)}
footer.site li{list-style:none;margin-bottom:8px}
footer.site .legal{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding-top:18px;font-size:13px;color:#a9cdae}
@media (max-width:760px){footer.site .cols{grid-template-columns:1fr}}

/* nút chat nổi */
.float{position:fixed;right:16px;bottom:16px;display:grid;gap:10px;z-index:60}
.float a{width:52px;height:52px;border-radius:50%;display:grid;place-items:center;color:#fff;box-shadow:0 6px 18px rgba(0,0,0,.2);font-weight:800;font-size:13px}
.float .zalo{background:#0068ff} .float .mess{background:#0084ff} .float .call{background:var(--gold);color:#fff}

.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%) translateY(120%);background:var(--navy);color:#fff;padding:14px 22px;border-radius:999px;font-weight:600;transition:.3s;z-index:70;box-shadow:var(--shadow)}
.toast.show{transform:translateX(-50%) translateY(0)}
.crumb{font-size:14px;color:var(--muted);padding-top:24px}
.crumb a:hover{color:var(--navy)}
.page-head{padding:40px 0 8px}
.page-head h1{font-size:clamp(30px,4vw,44px);font-weight:800;margin-top:8px}

/* ===== nhận diện thương hiệu Nệm Việt Nhật ===== */
h1,h2,h3,.logo b,.price,.pd .price,.card .price,.promise b{font-family:"Montserrat","Be Vietnam Pro",sans-serif}
h1,h2{font-weight:800}
.logo{flex-direction:row;align-items:center;gap:10px}
.logo img{width:44px;height:44px}
.logo span{display:flex;flex-direction:column;line-height:1}
.logo b{font-weight:900;font-size:21px;color:var(--navy);letter-spacing:.01em}
.logo small{font-family:"Saira Condensed",sans-serif;font-size:15px;letter-spacing:.06em;font-weight:500;color:var(--gold);margin-top:3px;text-transform:none}
footer.site .logo b{color:#fff} footer.site .logo small{color:#9fdcae}
.eyebrow{color:var(--gold-d)} .eyebrow::before{background:var(--gold)}
.hero h1 em{color:var(--gold)}
.slogan{font-family:"Saira Condensed",sans-serif;font-weight:500;letter-spacing:.06em}
.chips button.off{opacity:.4;text-decoration:line-through}
.card .pic,.pd .gallery{aspect-ratio:1/1}
.cart-item .thumb{width:84px;height:84px}