/* Báo Tech Mô Hình — giao diện "showroom tối giản":
   nền xám ấm rất nhạt, thẻ trắng không viền, chữ đen đậm, xanh thương hiệu chỉ làm điểm nhấn, giá đỏ */
:root{
  --bg:#f6f6f4; --bg-2:#efefec; --surface:#ffffff; --surface-2:#ececE8; --line:#e4e4df; --line-2:#d6d6d0;
  --fg:#111213; --muted:#6a6c6f; --gold:#178a43; --gold-2:#11703a; --gold-soft:rgba(23,138,67,.08);
  --green:#178a43; --red:#d13a2f; --price:#d13a2f; --ink:#111213; --ink-2:#2a2c2e;
  --shadow:0 1px 2px rgba(17,18,19,.04),0 10px 30px rgba(17,18,19,.07);
  --shadow-sm:0 1px 2px rgba(17,18,19,.05),0 2px 8px rgba(17,18,19,.04);
  --f-display:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-body:"Be Vietnam Pro",system-ui,-apple-system,"Segoe UI",sans-serif;
  --radius:14px; --radius-sm:10px; --wrap:1240px;
  color-scheme:light;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--f-body);font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--gold);outline-offset:2px}
h1,h2,h3,h4{font-family:var(--f-display);margin:0;line-height:1.2;text-wrap:balance;letter-spacing:-.02em}
.wrap{max-width:var(--wrap);margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:600}
.muted{color:var(--muted)}
.price{font-variant-numeric:tabular-nums;font-weight:700;color:var(--price)}
.old{color:var(--muted);text-decoration:line-through;font-weight:400;font-size:.88em;margin-left:6px}

/* Buttons: nút chính màu đen, rê chuột chuyển xanh thương hiệu */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border-radius:var(--radius-sm);border:1px solid transparent;font-weight:600;cursor:pointer;transition:background .2s,border-color .2s,color .2s,transform .1s;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn-gold{background:var(--ink);color:#fff}
.btn-gold:hover{background:var(--gold)}
.btn-ghost{border-color:var(--line-2);background:var(--surface)}
.btn-ghost:hover{border-color:var(--ink)}
.btn-block{width:100%}
.btn[disabled]{opacity:.5;cursor:not-allowed}

/* Topbar + header */
.topbar{background:var(--ink);font-size:12.5px;color:#a9adb2}
.topbar .wrap{display:flex;justify-content:space-between;gap:12px;padding-block:6px;flex-wrap:wrap}
.topbar b{color:#fff;font-weight:600}
.site-header{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;gap:24px;height:68px}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand img{width:44px;height:44px;border-radius:50%;background:#fff;object-fit:cover;box-shadow:0 0 0 1px var(--line)}
.brand b{display:block;font-size:17px;letter-spacing:.04em;font-weight:800}
.brand small{display:block;font-size:10.5px;color:var(--gold);letter-spacing:.16em;text-transform:uppercase;font-weight:600}
.nav{display:flex;gap:2px;margin-left:8px}
.nav a{padding:8px 14px;border-radius:8px;color:var(--muted);font-weight:500;font-size:14.5px}
.nav a:hover{color:var(--fg)}
.nav a.active{color:var(--fg);font-weight:700;box-shadow:inset 0 -2px 0 var(--ink);border-radius:0}
.header-tools{margin-left:auto;display:flex;align-items:center;gap:10px}
.search{display:flex;align-items:center;background:var(--bg);border:1px solid var(--line);border-radius:var(--radius-sm);padding:0 6px 0 14px;height:42px}
.search:focus-within{border-color:var(--ink);background:#fff}
.search input{background:none;border:0;outline:0;width:200px}
.search button{background:none;border:0;color:var(--muted);cursor:pointer;padding:6px;display:grid;place-items:center}
.icon-btn{position:relative;width:42px;height:42px;border-radius:var(--radius-sm);display:grid;place-items:center;background:#fff;border:1px solid var(--line);cursor:pointer}
.icon-btn:hover{border-color:var(--ink)}
.cart-count[hidden]{display:none}
.cart-count{position:absolute;top:-6px;right:-6px;min-width:20px;height:20px;padding:0 5px;border-radius:999px;background:var(--price);color:#fff;font-size:11px;font-weight:700;display:grid;place-items:center}
.menu-btn{display:none}
.mobile-nav{display:none}

/* Thanh danh mục ngang dưới header */
.catbar{border-top:1px solid var(--line);background:#fff}
.catbar .wrap{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none;height:46px;align-items:center}
.catbar .wrap::-webkit-scrollbar{display:none}
.catbar a{flex-shrink:0;padding:6px 12px;border-radius:999px;font-size:13.5px;color:var(--muted);font-weight:500;white-space:nowrap}
.catbar a:hover{color:var(--fg);background:var(--bg)}
.catbar a.on{color:#fff;background:var(--ink)}

/* Hero */
.hero{position:relative;overflow:hidden;background:var(--surface)}
.hero .wrap{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center;padding-block:56px}
.hero h1{font-size:clamp(32px,5vw,58px);font-weight:800;letter-spacing:-.035em;line-height:1.08}
.hero h1 em{font-style:normal;color:var(--gold)}
.hero p{color:var(--muted);max-width:50ch;font-size:16.5px;margin:20px 0 30px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.hero-stats{display:grid;grid-template-columns:repeat(3,auto);justify-content:start;margin-top:40px;border-top:1px solid var(--line);padding-top:22px}
.hero-stats>div{padding:0 clamp(14px,3vw,32px);border-left:1px solid var(--line)}
.hero-stats>div:first-child{padding-left:0;border-left:0}
.hero-stats b{display:block;font-size:24px;color:var(--fg);font-weight:800;letter-spacing:-.02em}
.hero-stats span{font-size:13px;color:var(--muted)}
.hero-stage{position:relative;aspect-ratio:1/1;max-width:540px;width:100%;justify-self:center}
.hero-stage .plinth{display:none}
.hero-stage svg{position:relative;width:100%;height:100%;animation:float 6s ease-in-out infinite}
.hero-stage img{position:relative;width:100%;height:100%;object-fit:cover}
@keyframes float{50%{transform:translateY(-10px)}}
@media (prefers-reduced-motion:reduce){.hero-stage svg{animation:none}html{scroll-behavior:auto}}

/* Sections */
.section{padding-block:64px}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:26px;flex-wrap:wrap}
.section-head h2{font-size:clamp(24px,3vw,34px);font-weight:800;margin-top:6px}
.section-head a{color:var(--fg);font-weight:600;font-size:14px;border-bottom:1.5px solid var(--ink);padding-bottom:2px}
.section-head a:hover{color:var(--gold);border-color:var(--gold)}

/* Category tiles */
.cats{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:16px}
.cat{background:var(--surface);border-radius:var(--radius);padding:10px 10px 14px;display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center;transition:transform .2s,box-shadow .2s;min-width:0;box-shadow:var(--shadow-sm)}
.cat:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
/* khung ảnh vuông cố định: ảnh dọc/ngang đều cắt vừa, các ô cao bằng nhau */
.cat .art{display:block;width:100%;aspect-ratio:1/1;border-radius:var(--radius-sm);overflow:hidden;background:var(--surface-2);margin-bottom:4px}
.cat .art img,.cat .art svg{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.cat:hover .art img{transform:scale(1.05)}
.cat b{font-size:14px;font-weight:700}
.cat span{font-size:12px;color:var(--muted);line-height:1.4}

/* Product grid: thẻ trắng không viền, ảnh vuông, đổ bóng khi rê chuột */
.grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.card{background:var(--surface);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:transform .2s,box-shadow .2s;min-width:0;box-shadow:var(--shadow-sm)}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.card .thumb{position:relative;display:block;aspect-ratio:1/1;background:var(--surface-2);overflow:hidden}
.card .thumb svg,.card .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .45s}
.card:hover .thumb img{transform:scale(1.04)}
.badges{position:absolute;top:10px;left:10px;display:flex;gap:6px;flex-wrap:wrap}
.badge{font-size:10.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;padding:4px 8px;border-radius:6px;background:rgba(255,255,255,.95);color:var(--fg)}
.badge.pre{background:var(--ink);color:#fff}
.badge.new{background:var(--gold);color:#fff}
.badge.sale{color:#fff;background:var(--price)}
.card .body{padding:14px 16px 16px;display:flex;flex-direction:column;gap:4px;flex:1}
.card .meta{font-size:11.5px;color:var(--muted);letter-spacing:.06em;text-transform:uppercase;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.card h3{font-size:14.5px;font-weight:600;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:2.8em}
.card .row{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:auto;padding-top:10px}
.card .price{font-size:16px}
.add-mini{width:36px;height:36px;border-radius:var(--radius-sm);border:1px solid var(--line);background:var(--surface);display:grid;place-items:center;cursor:pointer;flex-shrink:0;transition:background .2s,color .2s,border-color .2s}
.add-mini:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
.more{display:flex;flex-direction:column;align-items:center;gap:10px;margin-top:32px}
.more .muted{font-size:13px}

/* Why */
.why{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.why div{padding:24px;border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-sm)}
.why b{display:block;margin:12px 0 4px;font-size:15.5px}
.why p{margin:0;color:var(--muted);font-size:14px}
.why svg{color:var(--gold)}

/* Reviews */
.reviews{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.review{padding:22px;border-radius:var(--radius);background:var(--surface);display:flex;flex-direction:column;gap:12px;box-shadow:var(--shadow-sm)}
.review p{margin:0}
.review .stars{color:var(--gold);letter-spacing:2px}
.review small{color:var(--muted)}

/* CTA band: khối đen nổi bật */
.band{border-radius:20px;background:var(--ink);color:#fff;padding:44px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.band h2{font-size:clamp(22px,2.6vw,30px);font-weight:800}
.band p{margin:8px 0 0;color:#b4b8bc}
.band .btn-gold{background:var(--gold)}
.band .btn-gold:hover{background:#1fa152}
.band .btn-ghost{background:transparent;color:#fff;border-color:#4a4d50}
.band .btn-ghost:hover{border-color:#fff}

/* Page header */
.page-head{background:var(--surface);border-bottom:1px solid var(--line)}
.page-head .wrap{padding-block:30px}
.crumbs{font-size:13px;color:var(--muted);margin-bottom:8px}
.crumbs a:hover{color:var(--fg)}
.page-head h1{font-size:clamp(26px,3.5vw,38px);font-weight:800}

/* Shop layout */
.shop{display:grid;grid-template-columns:230px minmax(0,1fr);gap:32px;padding-block:32px}
.filters{display:flex;flex-direction:column;gap:22px;align-self:start;position:sticky;top:132px}
.filters h4{font-size:12px;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);margin-bottom:10px}
.filters label{display:flex;align-items:center;gap:10px;padding:4px 0;cursor:pointer;font-size:14px}
.filters input[type=radio],.filters input[type=checkbox]{accent-color:var(--ink)}
.toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px;flex-wrap:wrap}
select,.input,textarea{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:10px 12px;outline:0}
select:focus,.input:focus,textarea:focus{border-color:var(--ink)}
.empty{padding:48px;text-align:center;border:1px dashed var(--line-2);border-radius:var(--radius);color:var(--muted);background:var(--surface)}
.filter-toggle{display:none}
.shop-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
@media (max-width:1180px){.shop-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (max-width:860px){.shop-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (max-width:600px){.shop-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}}

/* Product detail */
.pd{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;padding-block:36px}
.gallery{display:flex;flex-direction:column;gap:12px;min-width:0}
.gallery .main{aspect-ratio:1/1;border-radius:var(--radius);overflow:hidden;background:var(--surface-2)}
.gallery .main svg,.gallery .main img{width:100%;height:100%;object-fit:cover}
.thumbs{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.thumbs button{aspect-ratio:1/1;border-radius:var(--radius-sm);overflow:hidden;border:2px solid transparent;padding:0;background:var(--surface-2);cursor:pointer;opacity:.75;transition:opacity .2s,border-color .2s}
.thumbs button:hover{opacity:1}
.thumbs button.on{border-color:var(--ink);opacity:1}
.thumbs svg,.thumbs img{width:100%;height:100%;object-fit:cover}
.pd-info{display:flex;flex-direction:column;gap:16px;min-width:0}
.pd-info h1{font-size:clamp(24px,3vw,34px);font-weight:800}
.pd-price{font-size:30px;letter-spacing:-.02em}
.status{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600}
.status i{width:8px;height:8px;border-radius:50%;background:var(--green)}
.status.pre i{background:#1d4ed8}
.specs{display:grid;grid-template-columns:auto 1fr;gap:10px 24px;padding:18px 20px;border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-sm);font-size:14px;margin:0}
.specs dt{color:var(--muted)}.specs dd{margin:0;font-weight:500}
.qty{display:inline-flex;align-items:center;border:1px solid var(--line-2);border-radius:var(--radius-sm);overflow:hidden;background:#fff}
.qty button{width:40px;height:44px;background:none;border:0;cursor:pointer;font-size:18px}
.qty button:hover{color:var(--gold)}
.qty input{width:46px;text-align:center;background:none;border:0;outline:0;font-variant-numeric:tabular-nums;-moz-appearance:textfield}
.qty input::-webkit-inner-spin-button{-webkit-appearance:none}
.buy-row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.buy-row .btn{padding-block:13px}
.perks{display:grid;gap:8px;font-size:14px;color:var(--muted);padding:0;margin:0;list-style:none}
.perks li::before{content:"✓";color:var(--gold);margin-right:8px;font-weight:700}
.tabs-body{padding:22px 0;border-top:1px solid var(--line);max-width:75ch;color:#2b2d30}

/* Cart drawer */
.drawer-bg{position:fixed;inset:0;background:rgba(17,18,19,.4);z-index:80;opacity:0;pointer-events:none;transition:opacity .25s}
.drawer{position:fixed;top:0;right:0;bottom:0;width:min(420px,100%);background:#fff;box-shadow:-12px 0 40px rgba(17,18,19,.14);z-index:90;transform:translateX(100%);transition:transform .3s ease;display:flex;flex-direction:column;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px);padding-right:env(safe-area-inset-right,0px)}
body.cart-open .drawer{transform:none}
body.cart-open .drawer-bg{opacity:1;pointer-events:auto}
.drawer header{display:flex;justify-content:space-between;align-items:center;padding:18px 20px;border-bottom:1px solid var(--line)}
.drawer .items{flex:1;overflow:auto;padding:8px 20px}
.drawer footer{padding:18px 20px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:10px}
.line{display:grid;grid-template-columns:64px minmax(0,1fr) auto;gap:12px;padding:14px 0;border-bottom:1px solid var(--line);align-items:center}
.line .pic{display:block;width:64px;height:64px;border-radius:var(--radius-sm);overflow:hidden;background:var(--surface-2)}
.line .pic svg,.line .pic img{width:100%;height:100%;object-fit:cover}
.line b{font-size:14px;font-weight:600;display:block}
.line .qty button{width:30px;height:32px;font-size:15px}.line .qty input{width:32px;font-size:14px}
.remove{background:none;border:0;color:var(--muted);cursor:pointer;font-size:12px;padding:4px 0}
.remove:hover{color:var(--red)}
.sumrow{display:flex;justify-content:space-between;font-size:14px}
.sumrow.total{font-size:17px;font-weight:700}

/* Cart page / checkout */
.two-col{display:grid;grid-template-columns:minmax(0,1fr) 380px;gap:32px;padding-block:32px;align-items:start}
.panel{background:var(--surface);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm)}
.panel h3{font-size:17px;margin-bottom:14px}
.cart-table .line{grid-template-columns:84px minmax(0,1fr) auto auto;gap:16px}
.cart-table .line .pic{width:84px;height:84px}
.summary{position:sticky;top:132px;display:flex;flex-direction:column;gap:12px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.field{display:flex;flex-direction:column;gap:6px;min-width:0}
.field.full{grid-column:1/-1}
.field label{font-size:13px;color:var(--muted);font-weight:500}
.field .err{font-size:12px;color:var(--red);min-height:0}
.field.bad .input,.field.bad select{border-color:var(--red)}
.pay-opts{display:grid;gap:10px}
.pay-opt{display:flex;gap:12px;align-items:flex-start;padding:14px;border:1px solid var(--line);border-radius:var(--radius-sm);cursor:pointer;background:#fff}
.pay-opt:has(input:checked){border-color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink)}
.pay-opt input{accent-color:var(--ink);margin-top:4px}
.pay-opt b{display:block}
.pay-opt span{font-size:13px;color:var(--muted)}
.steps{display:flex;gap:8px;margin-bottom:20px;font-size:13px;color:var(--muted);flex-wrap:wrap}
.steps span{padding:6px 12px;border-radius:999px;border:1px solid var(--line);background:#fff}
.steps span.on{color:#fff;background:var(--ink);border-color:var(--ink);font-weight:600}
.review-box dl{display:grid;grid-template-columns:auto 1fr;gap:6px 18px;margin:0;font-size:14px}
.review-box dt{color:var(--muted)}.review-box dd{margin:0;overflow-wrap:anywhere}
.notice{padding:12px 14px;border-radius:var(--radius-sm);background:var(--gold-soft);border:1px solid rgba(23,138,67,.25);font-size:14px}
.notice.err{background:rgba(209,58,47,.07);border-color:rgba(209,58,47,.35);color:#9f2a22}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}

/* Success */
.success{max-width:640px;margin:0 auto;text-align:center;padding-block:56px;display:flex;flex-direction:column;gap:18px;align-items:center}
.success .tick{width:72px;height:72px;border-radius:50%;display:grid;place-items:center;background:var(--gold-soft);color:var(--gold);border:1px solid var(--gold)}
.code{font-size:24px;font-weight:800;letter-spacing:.08em;color:var(--fg)}
.qr{background:#fff;border-radius:12px;padding:10px;width:240px}

/* Content pages */
.prose{max-width:75ch;padding-block:36px}
.prose h2{font-size:22px;margin:28px 0 10px}
.prose p,.prose li{color:#2b2d30}
.contact{display:grid;grid-template-columns:1fr 1fr;gap:28px;padding-block:36px}
.contact-list{display:grid;gap:12px}
.contact-item{display:flex;gap:14px;align-items:center;padding:16px;border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-sm)}
.contact-item .ic{width:44px;height:44px;border-radius:var(--radius-sm);display:grid;place-items:center;background:var(--bg);color:var(--fg);flex-shrink:0}
.contact-item b{display:block}
.contact-item span{color:var(--muted);font-size:14px}
.policy-nav{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:8px}
.policy-nav a{padding:7px 14px;border:1px solid var(--line);border-radius:999px;font-size:14px;background:#fff}
.policy-nav a:hover{border-color:var(--ink)}

/* Footer */
.site-footer{background:var(--surface);border-top:1px solid var(--line);margin-top:48px}
.site-footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:28px;padding-block:48px}
.site-footer h4{font-size:12px;text-transform:uppercase;letter-spacing:.12em;color:var(--muted);margin-bottom:12px}
.site-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:8px;font-size:14px}
.site-footer a:hover{color:var(--gold)}
.site-footer .bottom{border-top:1px solid var(--line);padding-block:16px;font-size:13px;color:var(--muted);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

/* Floating contact */
.float{position:fixed;right:calc(16px + env(safe-area-inset-right,0px));bottom:calc(16px + env(safe-area-inset-bottom,0px));display:flex;flex-direction:column;gap:10px;z-index:60}
.float a{width:50px;height:50px;border-radius:50%;display:grid;place-items:center;box-shadow:0 8px 24px rgba(17,18,19,.25);font-weight:800;font-size:13px}
.float .zalo{background:#0068ff;color:#fff}
.float .call{background:var(--ink);color:#fff}

/* Toast */
.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom,0px));transform:translate(-50%,20px);background:var(--ink);color:#fff;border:0;box-shadow:var(--shadow);padding:12px 18px;border-radius:12px;z-index:100;opacity:0;transition:opacity .25s,transform .25s;pointer-events:none;font-size:14px;max-width:calc(100% - 32px)}
.toast.show{opacity:1;transform:translate(-50%,0)}

/* Responsive */
@media (max-width:1080px){
  .nav{display:none}.menu-btn{display:grid}
  .search input{width:140px}
  .grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .cats{grid-template-columns:repeat(4,minmax(0,1fr))}
  .why{grid-template-columns:repeat(2,minmax(0,1fr))}
  .mobile-nav{display:block;max-height:0;overflow:hidden;transition:max-height .3s;border-top:1px solid transparent}
  body.nav-open .mobile-nav{max-height:420px;border-top-color:var(--line)}
  .mobile-nav a{display:block;padding:12px 0;border-bottom:1px solid var(--line)}
  .site-footer .cols{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  .hero .wrap{grid-template-columns:1fr;padding-block:32px;gap:28px}
  .hero-stage{max-width:420px;order:-1}
  .shop{grid-template-columns:1fr}
  .filters{position:static;display:none;padding:16px;border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-sm)}
  body.filters-open .filters{display:flex}
  .filter-toggle{display:inline-flex}
  .pd,.two-col,.contact{grid-template-columns:1fr}
  .summary{position:static}
  .reviews{grid-template-columns:1fr}
  .cats{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:600px){
  .search{display:none}
  .section{padding-block:44px}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
  .cats{gap:10px}
  .cat{padding:6px 6px 10px}
  .cat span{display:none}
  .card .body{padding:11px 12px 12px}
  .card h3{font-size:13.5px}
  .card .price{font-size:15px}
  .hero-stats b{font-size:20px}
  .hero-stats span{font-size:12px}
  .why,.form-grid{grid-template-columns:1fr}
  .site-footer .cols{grid-template-columns:1fr}
  .cart-table .line{grid-template-columns:64px minmax(0,1fr) auto}
  .cart-table .line .pic{width:64px;height:64px}
  .cart-table .line .lt{display:none}
  .band{padding:28px 22px}
  .brand small{display:none}
  .topbar .hide-sm{display:none}
}
.price.quote{color:var(--fg);font-size:14px}
.pd-price.quote{font-size:26px}
/* Gợi ý miễn phí ship */
.ship-hint{display:block;font-size:13px;color:var(--muted);background:var(--bg);border-radius:8px;padding:8px 10px;line-height:1.45}
.ship-hint b{color:var(--fg)}
.ship-hint.ok{color:var(--gold);background:var(--gold-soft);font-weight:600}