:root{--navy:#1F3A5F;--navy-d:#16294a;--orange:#F28C28;--ink:#1D2430;--light:#E9EEF4;--muted:#5b6574;--line:#dfe3ea;--bg:#ffffff;--radius:10px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 'Be Vietnam Pro',Arial,sans-serif}
img{max-width:100%;display:block}
a{color:var(--navy)}
.wrap{max-width:1160px;margin:0 auto;padding:0 20px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 20px;border-radius:8px;font-weight:700;text-decoration:none;border:2px solid transparent;cursor:pointer;font:inherit;font-weight:700;font-size:15px}
.btn-o{background:var(--orange);color:var(--ink)}
.btn-o:hover{background:#e07b16}
.btn-n{background:var(--navy);color:#fff}
.btn-n:hover{background:var(--navy-d)}
.btn-l{border-color:currentColor;color:inherit;background:transparent}
.badge{background:var(--navy);color:#fff;border-radius:99px;font-size:12px;padding:1px 7px;min-width:20px;text-align:center}
.btn-o .badge{background:var(--ink)}
/* header */
header.top{position:sticky;top:0;z-index:20;background:#fff;border-bottom:3px solid var(--orange)}
header.top .wrap{display:flex;align-items:center;gap:24px;height:72px}
header.top .logo img{height:42px;width:auto}
nav.main{display:flex;gap:22px;margin-left:auto}
nav.main a{text-decoration:none;font-weight:600;font-size:15px;color:var(--ink)}
nav.main a.on,nav.main a:hover{color:var(--navy);box-shadow:inset 0 -2px 0 var(--orange)}
.lang{font-size:14px;font-weight:600;color:var(--muted)}
.lang a{text-decoration:none;color:var(--muted)}
.lang b{color:var(--navy)}
.menu-btn{display:none;background:none;border:0;font-size:26px;cursor:pointer;color:var(--navy)}
@media(max-width:900px){
 nav.main{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;flex-direction:column;gap:0;border-bottom:1px solid var(--line)}
 nav.main.open{display:flex}
 nav.main a{padding:14px 20px;border-top:1px solid var(--line)}
 .menu-btn{display:block;margin-left:auto}
 header.top .cta-top{display:none}
}
/* hero */
.hero{position:relative;color:#fff;background:var(--navy) url(img/ke-kho-nha-may-1.jpg) center/cover}
.hero::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(22,41,74,.95) 0%,rgba(31,58,95,.82) 55%,rgba(31,58,95,.35) 100%)}
.hero .wrap{position:relative;padding:88px 20px 96px}
.kick{color:var(--orange);font-weight:700;letter-spacing:.16em;font-size:13px;text-transform:uppercase}
.hero h1{font-size:46px;line-height:1.12;margin:12px 0 14px;max-width:720px;font-weight:800}
.hero p{font-size:18px;max-width:640px;color:#dbe4ef;margin:0 0 28px}
.hero .actions{display:flex;gap:14px;flex-wrap:wrap}
@media(max-width:700px){.hero h1{font-size:32px}.hero .wrap{padding:56px 20px 64px}}
/* stats */
.stats{background:var(--light)}
.stats .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;padding:26px 20px}
.stat b{display:block;font-size:30px;color:var(--navy);font-weight:800;line-height:1.1}
.stat span{font-size:14px;color:var(--muted)}
@media(max-width:700px){.stats .wrap{grid-template-columns:repeat(2,1fr)}.stat b{font-size:22px}}
/* sections */
section.s{padding:72px 0}
section.alt{background:#f6f8fb}
.h2{font-size:32px;line-height:1.2;color:var(--navy);margin:0 0 8px;font-weight:800}
.lead{color:var(--muted);max-width:720px;margin:0 0 36px;font-size:17px}
.grid{display:grid;gap:18px}
.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}.g2{grid-template-columns:repeat(2,1fr)}
@media(max-width:900px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.g3,.g4,.g2{grid-template-columns:1fr}}
.cat{display:flex;gap:14px;padding:18px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;text-decoration:none;color:var(--ink);transition:.15s}
.cat:hover{border-color:var(--navy);box-shadow:0 4px 14px rgba(31,58,95,.10)}
.cat .ic{flex:0 0 44px;height:44px;border-radius:8px;background:var(--navy);color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:14px}
.cat h3{margin:0;font-size:16px;color:var(--navy)}
.cat p{margin:4px 0 0;font-size:14px;color:var(--muted);line-height:1.45}
.why{border-left:3px solid var(--orange);padding:2px 0 2px 16px}
.why b{color:var(--orange);font-size:13px}
.why h3{margin:2px 0 6px;font-size:18px;color:var(--navy)}
.why p{margin:0;color:var(--muted);font-size:15px}
.steps{counter-reset:s}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.step::before{counter-increment:s;content:counter(s);display:inline-flex;width:34px;height:34px;border-radius:50%;background:var(--navy);color:#fff;font-weight:800;align-items:center;justify-content:center;margin-bottom:10px}
.step h3{margin:0 0 4px;font-size:17px}
.step p{margin:0;font-size:14px;color:var(--muted)}
.zones .z{border-radius:var(--radius);padding:20px;border:1px solid var(--line);background:#fff}
.zones .z.z1{background:var(--navy);color:#fff;border-color:var(--navy)}
.zones .z h3{margin:0 0 2px;font-size:17px}
.zones .z small{color:var(--muted)}.zones .z.z1 small{color:#c9d5e4}
.zones .z p{margin:8px 0 0;font-size:15px}
.band{background:var(--orange);color:var(--ink)}
.band .wrap{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:34px 20px;flex-wrap:wrap}
.band h2{margin:0;font-size:26px}
.photos{display:grid;grid-template-columns:1.3fr 1fr;grid-template-rows:240px 240px;gap:12px}
.photos div{background-size:cover;background-position:center;border-radius:var(--radius)}
.photos .big{grid-row:1/3}
@media(max-width:700px){.photos{grid-template-columns:1fr;grid-template-rows:220px 180px 180px}.photos .big{grid-row:auto}}
.check{list-style:none;padding:0;margin:0}
.check li{padding:10px 0 10px 30px;border-bottom:1px solid var(--line);position:relative}
.check li::before{content:"✓";position:absolute;left:4px;color:var(--orange);font-weight:800}
/* products */
.prod-layout{display:grid;grid-template-columns:250px 1fr;gap:28px;align-items:start}
@media(max-width:900px){.prod-layout{grid-template-columns:1fr}}
.filters{position:sticky;top:90px;border:1px solid var(--line);border-radius:var(--radius);padding:14px}
.filters button{display:flex;justify-content:space-between;width:100%;text-align:left;background:none;border:0;padding:8px 10px;border-radius:6px;font:inherit;font-size:14px;cursor:pointer;color:var(--ink)}
.filters button.on{background:var(--navy);color:#fff}
.filters button span{opacity:.7}
@media(max-width:900px){.filters{position:static;display:flex;overflow-x:auto;gap:6px;padding:8px}.filters button{white-space:nowrap;width:auto}}
.search{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:8px;font:inherit;margin-bottom:12px}
.count{color:var(--muted);font-size:14px;margin-bottom:10px}
.items{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.item{display:grid;grid-template-columns:1fr 90px 110px;gap:12px;align-items:center;padding:12px 16px;border-top:1px solid var(--line)}
.item:first-child{border-top:0}
.item .nm{font-weight:600;font-size:15px}
.item .sp{font-size:13px;color:var(--muted)}
.item .u{font-size:14px;color:var(--muted)}
.item button{padding:7px 10px;font-size:13px}
.item button.added{background:var(--light);color:var(--navy)}
@media(max-width:600px){.item{grid-template-columns:1fr auto}.item .u{display:none}}
.note{background:var(--light);border-radius:8px;padding:12px 16px;font-size:14px;color:var(--muted);margin-top:14px}
/* forms */
.form{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.form label{font-size:14px;font-weight:600;display:flex;flex-direction:column;gap:6px}
.form input,.form textarea,.form select{font:inherit;font-weight:400;padding:10px 12px;border:1px solid var(--line);border-radius:8px}
.form .full{grid-column:1/3}
@media(max-width:600px){.form{grid-template-columns:1fr}.form .full{grid-column:auto}}
table.cart{width:100%;border-collapse:collapse;margin-bottom:12px}
table.cart th,table.cart td{border-bottom:1px solid var(--line);padding:8px;text-align:left;font-size:14px;vertical-align:middle}
table.cart th{background:var(--light)}
table.cart input{width:80px;padding:6px;border:1px solid var(--line);border-radius:6px;font:inherit}
table.cart .x{background:none;border:0;color:#c8102e;font-size:18px;cursor:pointer}
.empty{color:var(--muted);padding:14px 0}
.contact-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:28px}
@media(max-width:800px){.contact-grid{grid-template-columns:1fr}}
.map{border:0;width:100%;height:340px;border-radius:var(--radius)}
.info dt{font-size:12px;font-weight:700;color:var(--orange);text-transform:uppercase;letter-spacing:.08em;margin-top:14px}
.info dd{margin:2px 0 0}
/* footer */
footer{background:var(--navy-d);color:#c9d5e4;font-size:14px}
footer .wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:28px;padding:48px 20px 28px}
footer h4{color:#fff;margin:0 0 10px;font-size:15px}
footer a{color:#c9d5e4;text-decoration:none}
footer a:hover{color:#fff}
footer .logo img{height:40px;background:#fff;padding:6px 10px;border-radius:6px}
footer .copy{border-top:1px solid rgba(255,255,255,.12);padding:14px 20px;text-align:center;font-size:13px}
@media(max-width:800px){footer .wrap{grid-template-columns:1fr}}
.page-head{background:var(--navy);color:#fff}
.page-head .wrap{padding:44px 20px}
.page-head h1{margin:6px 0 4px;font-size:34px}
.page-head p{margin:0;color:#c9d5e4}
.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:var(--ink);color:#fff;padding:10px 18px;border-radius:8px;font-size:14px;opacity:0;transition:.2s;pointer-events:none;z-index:50}
.toast.on{opacity:1}