:root{
  --red:#e11d2a; --red-d:#b3151f; --dark:#1a1a1a; --ink:#222; --muted:#666;
  --line:#e6e6e6; --bg:#f5f6f8; --amber:#ff7a00; --radius:10px;
  --max:1200px;
}
*{box-sizing:border-box}
body{margin:0;font-family:'Roboto',system-ui,Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.55}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{font-family:'Roboto Condensed','Roboto',sans-serif;line-height:1.2;margin:0 0 .5em}
.container{max-width:var(--max);margin:0 auto;padding:0 16px}
.btn{display:inline-flex;align-items:center;gap:.4em;justify-content:center;border:none;border-radius:8px;padding:11px 20px;font-weight:700;font-size:15px;cursor:pointer;transition:.15s;font-family:inherit}
.btn-primary{background:var(--red);color:#fff}
.btn-primary:hover{background:var(--red-d)}
.btn-ghost{background:#fff;color:var(--ink);border:2px solid var(--line)}
.btn-ghost:hover{border-color:var(--red);color:var(--red)}
.btn-lg{padding:14px 26px;font-size:16px}
.btn-block{width:100%}

/* header */
.topbar{background:var(--dark);color:#ddd;font-size:13px}
.topbar-in{display:flex;justify-content:space-between;padding:7px 16px;max-width:var(--max);margin:0 auto}
.topbar-hot a{color:#fff;font-weight:700}
.site-header{border-bottom:1px solid var(--line);position:sticky;top:0;background:#fff;z-index:50}
.header-in{display:flex;align-items:center;gap:20px;padding:12px 16px}
.logo{display:flex;flex-direction:column;line-height:1}
.logo-mark{font-family:'Roboto Condensed';font-weight:700;font-size:30px;color:var(--red);letter-spacing:1px}
.logo small{color:var(--dark);font-weight:700;letter-spacing:6px;font-size:11px}
.search{flex:1;display:flex;max-width:520px}
.search input{flex:1;border:2px solid var(--line);border-right:none;border-radius:8px 0 0 8px;padding:10px 14px;font-size:14px;outline:none}
.search input:focus{border-color:var(--red)}
.search button{background:var(--red);color:#fff;border:none;border-radius:0 8px 8px 0;padding:0 16px;cursor:pointer;font-size:16px}
.hotbox{display:flex;flex-direction:column;line-height:1.2;border-left:1px solid var(--line);padding-left:18px}
.hotbox span{font-size:12px;color:var(--muted)}
.hotbox strong{color:var(--red);font-size:20px;font-family:'Roboto Condensed'}
.burger{display:none;background:none;border:none;font-size:26px;cursor:pointer}
.mainnav{background:var(--red)}
.mainnav>.container>ul{list-style:none;display:flex;margin:0;padding:0;flex-wrap:wrap}
.mainnav a{color:#fff;font-weight:600;padding:12px 16px;display:block;font-size:15px}
.mainnav li{position:relative}
.mainnav>.container>ul>li>a:hover{background:rgba(0,0,0,.15)}
.has-sub .sub{display:none;position:absolute;top:100%;left:0;background:#fff;min-width:240px;box-shadow:0 10px 30px rgba(0,0,0,.15);list-style:none;padding:6px 0;z-index:60;border-radius:0 0 8px 8px}
.has-sub:hover .sub{display:block}
.sub a{color:var(--ink);padding:9px 16px;font-weight:500;font-size:14px}
.sub a:hover{background:var(--bg);color:var(--red)}

/* hero banner + slider */
.hero-banner{position:relative;background:#111}
.hb-track{position:relative;aspect-ratio:1024/472;overflow:hidden}
.hb-slide{position:absolute;inset:0;display:none;text-decoration:none}
.hb-slide.active{display:block}
.hero-banner>.hb-track>.hb-slide>img{width:100%;height:100%;object-fit:cover;display:block}
.hb-dots{position:absolute;bottom:14px;left:0;right:0;display:flex;gap:8px;justify-content:center;line-height:1;z-index:5}
.hb-dots button{width:12px;height:12px;border-radius:50%;border:2px solid #fff;background:transparent;cursor:pointer;padding:0;box-shadow:0 1px 4px rgba(0,0,0,.4)}
.hb-dots button.active{background:#fff}

/* banner thiết kế (promo) — chia đôi tối/sáng */
.lfb{display:block;overflow:hidden}
.lfb.theme-red{background:linear-gradient(115deg,#161616 0%,#4a0e15 55%,#e11d2a 120%)}
.lfb.theme-dark{background:linear-gradient(115deg,#0f1418 0%,#1b2a30 55%,#0a6b6b 125%)}
.lfb-text{position:absolute;left:0;top:0;bottom:0;width:58%;z-index:3;display:flex;flex-direction:column;justify-content:center;align-items:flex-start;padding:0 4% 0 5%;color:#fff}
.lfb-badge{display:inline-block;background:#ff7a00;color:#fff;font-weight:700;font-size:clamp(9px,1.35vw,14px);padding:5px 13px;border-radius:20px;margin-bottom:2.5%;letter-spacing:.3px}
.lfb-text h2{font-family:'Roboto Condensed';font-weight:700;font-size:clamp(19px,4.3vw,50px);line-height:1.03;margin:0 0 2%;text-transform:uppercase;text-shadow:0 2px 12px rgba(0,0,0,.4)}
.lfb-text p{font-size:clamp(10px,1.65vw,18px);color:#f0e2e3;margin:0 0 3%}
.theme-dark .lfb-text p{color:#dbeceb}
.lfb-price{font-size:clamp(11px,1.6vw,18px);color:#fff;margin-bottom:3.5%}
.lfb-price b{color:#ffd23f;font-family:'Roboto Condensed';font-size:clamp(16px,2.7vw,32px);margin-left:6px}
.lfb-btn{display:inline-block;background:#fff;color:#e11d2a;font-weight:700;padding:2.2% 4.5%;border-radius:8px;font-size:clamp(11px,1.55vw,17px)}
.theme-dark .lfb-btn{color:#0a6b6b}
.lfb-hot{margin-top:3.5%;font-weight:700;font-size:clamp(10px,1.4vw,16px);color:#fff;opacity:.95}
.lfb-media{position:absolute;right:0;top:0;bottom:0;width:47%;background:#f4f5f6;clip-path:polygon(20% 0,100% 0,100% 100%,0 100%);display:flex;align-items:center;justify-content:center}
.lfb-media img{max-width:82%;max-height:86%;object-fit:contain;filter:drop-shadow(0 12px 26px rgba(0,0,0,.28))}
@media(max-width:600px){
  .lfb-text{width:60%;padding-left:4%}
  .lfb-hot{display:none}
  .lfb-media{width:46%}
}

/* hero (bản chữ cũ — giữ lại phòng khi cần) */
.hero{background:#1a1a1a url("hero-bg.svg") center/cover no-repeat;color:#fff;padding:64px 0}
.hero-in{display:grid;grid-template-columns:1.4fr 1fr;gap:40px;align-items:center}
.hero .badge{display:inline-block;background:var(--amber);color:#fff;padding:5px 12px;border-radius:20px;font-size:13px;font-weight:700;margin-bottom:14px}
.hero h1{font-size:42px;margin-bottom:14px}
.hero p{color:#e0d5d5;font-size:17px;max-width:560px}
.hero-cta{display:flex;gap:12px;margin-top:24px;flex-wrap:wrap}
.hero-badges{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px}
.hero-badges div{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);border-radius:12px;padding:18px 10px;text-align:center}
.hero-badges strong{display:block;font-size:28px;color:var(--amber);font-family:'Roboto Condensed'}
.hero-badges span{font-size:13px;color:#ccc}

/* sections */
.section{padding:40px 0}
.sec-head{display:flex;justify-content:space-between;align-items:baseline;border-bottom:3px solid var(--red);margin-bottom:22px;padding-bottom:8px}
.sec-head h2{font-size:26px;text-transform:uppercase;margin:0}
.sec-head a{color:var(--red);font-weight:700;font-size:14px}

.catgrid{display:grid;grid-template-columns:repeat(6,1fr);gap:14px}
.catcard{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:14px;text-align:center;transition:.15s;display:flex;flex-direction:column;align-items:center;gap:6px}
.catcard:hover{border-color:var(--red);box-shadow:0 8px 22px rgba(0,0,0,.08);transform:translateY(-3px)}
.catcard-img{width:90px;height:90px;display:flex;align-items:center;justify-content:center;overflow:hidden}
.catcard-img img{max-height:90px;object-fit:contain}
.catcard span{font-weight:700;font-size:13px;line-height:1.25}
.catcard small{color:var(--muted);font-size:12px}

.promo-strip{background:linear-gradient(120deg,#1e1e1e,#3a0d10);border-top:3px solid var(--red);border-bottom:3px solid var(--red)}
.promo-strip .container{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;padding:24px 16px}
.promo-strip .container>div{display:flex;flex-direction:column;align-items:center;text-align:center;gap:4px;color:#fff}
.promo-strip .ps-ic{font-size:38px;line-height:1}
.promo-strip b{font-size:19px;font-family:'Roboto Condensed';text-transform:uppercase;letter-spacing:.3px}
.promo-strip small{font-size:14px;color:#e0b8bb}
@media(max-width:760px){
  .promo-strip .container{grid-template-columns:repeat(2,1fr);gap:18px}
  .promo-strip .ps-ic{font-size:32px}
  .promo-strip b{font-size:16px}
}

/* product grid */
.pgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.pcard{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;transition:.15s}
.pcard:hover{border-color:var(--red);box-shadow:0 10px 26px rgba(0,0,0,.10);transform:translateY(-3px)}
.pcard-img{aspect-ratio:1;background:#fff;display:flex;align-items:center;justify-content:center;padding:12px;border-bottom:1px solid #f0f0f0}
.pcard-img img{max-height:100%;object-fit:contain}
.pcard-body{padding:12px 14px;display:flex;flex-direction:column;gap:8px;flex:1}
.pcard-body h3{font-size:15px;font-family:'Roboto';font-weight:500;line-height:1.35;margin:0;min-height:40px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.p-price{color:var(--red);font-weight:700;font-size:18px;font-family:'Roboto Condensed'}
.p-price del{color:#aaa;font-size:13px;font-weight:400;margin-left:8px}
.p-price.contact{color:var(--amber);font-size:16px}
.pcard-cta{margin-top:auto;background:var(--bg);color:var(--ink);text-align:center;padding:8px;border-radius:6px;font-size:13px;font-weight:600}
.pcard:hover .pcard-cta{background:var(--red);color:#fff}

/* bands */
.cta-band{background:linear-gradient(120deg,var(--red),var(--amber));color:#fff;text-align:center;padding:44px 0;margin-top:20px}
.cta-band h2{font-size:30px;margin-bottom:6px}
.cta-band p{margin:0 0 18px}
.cta-band .btn-primary{background:#fff;color:var(--red)}

/* footer */
.site-footer{background:#1e1e1e;color:#bbb;margin-top:40px;font-size:14px}
.foot-grid{display:grid;grid-template-columns:1.6fr 1.4fr 1fr 1.4fr;gap:30px;padding:44px 16px 30px}
.site-footer h4{color:#fff;font-size:16px;border-bottom:1px dashed #555;padding-bottom:6px;margin-bottom:12px}
.foot-logo .logo-mark{font-size:26px}
.site-footer p{margin:.4em 0}
.foot-links{list-style:none;padding:0;margin:0}
.foot-links li{padding:4px 0}
.foot-links a:hover{color:var(--red)}
.site-footer a{color:#ddd}
.foot-copy{border-top:1px solid #333;padding:14px 0;text-align:center;font-size:13px;color:#888}
.callfab{position:fixed;bottom:22px;right:22px;background:var(--red);color:#fff;width:56px;height:56px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:24px;box-shadow:0 8px 24px rgba(225,29,42,.5);z-index:80;animation:pulse 1.8s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(225,29,42,.5)}70%{box-shadow:0 0 0 16px rgba(225,29,42,0)}100%{box-shadow:0 0 0 0 rgba(225,29,42,0)}}

/* breadcrumb */
.breadcrumb{padding:14px 16px;font-size:13px;color:var(--muted)}
.breadcrumb a:hover{color:var(--red)}

/* shop */
.shop{display:grid;grid-template-columns:250px 1fr;gap:24px;padding-bottom:40px}
.shop-side h3{font-size:17px;background:var(--red);color:#fff;padding:10px 14px;border-radius:8px 8px 0 0;margin:0}
.cattree{list-style:none;margin:0 0 18px;padding:8px 0;border:1px solid var(--line);border-top:none;border-radius:0 0 8px 8px}
.cattree li a{display:block;padding:7px 14px;font-size:14px}
.cattree li a:hover{background:var(--bg);color:var(--red)}
.cattree ul{list-style:none;padding-left:14px;margin:0}
.cattree ul li a{font-size:13px;color:var(--muted);padding:5px 14px}
.side-hot{background:var(--bg);border-radius:8px;padding:16px;text-align:center}
.side-hot p{margin:0 0 8px;font-weight:700}
.shop-bar{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;margin-bottom:18px}
.shop-bar h1{font-size:24px;margin:0}
.shop-tools{display:flex;gap:10px}
.shop-tools input,.shop-tools select{border:2px solid var(--line);border-radius:8px;padding:9px 12px;font-size:14px;font-family:inherit}
.shop-tools input:focus,.shop-tools select:focus{border-color:var(--red);outline:none}
.empty{padding:40px;text-align:center;color:var(--muted)}
.pager{display:flex;gap:6px;justify-content:center;margin-top:28px;flex-wrap:wrap}
.pager button{border:1px solid var(--line);background:#fff;padding:8px 14px;border-radius:6px;cursor:pointer;font-weight:600}
.pager button.active{background:var(--red);color:#fff;border-color:var(--red)}
.pager button:disabled{opacity:.4;cursor:default}

/* product detail */
.product{display:grid;grid-template-columns:1fr 1.1fr;gap:34px;padding-bottom:20px}
.gal-main{border:1px solid var(--line);border-radius:12px;padding:20px;display:flex;align-items:center;justify-content:center;background:#fff}
.gal-main img{max-height:420px;object-fit:contain}
.gal-thumbs{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}
.gal-thumbs img{width:72px;height:72px;object-fit:contain;border:2px solid var(--line);border-radius:8px;padding:4px;cursor:pointer}
.gal-thumbs img.active,.gal-thumbs img:hover{border-color:var(--red)}
.pd-info h1{font-size:28px}
.pd-meta{display:flex;gap:16px;flex-wrap:wrap;color:var(--muted);font-size:13px;margin-bottom:14px}
.pd-meta a{color:var(--red)}
.pd-price{font-size:32px;color:var(--red);font-weight:700;font-family:'Roboto Condensed';background:var(--bg);padding:14px 18px;border-radius:10px;margin-bottom:18px}
.pd-price del{color:#999;font-size:18px;font-weight:400;margin-left:12px}
.pd-price.contact{color:var(--amber);font-size:24px}
.pd-usp{list-style:none;padding:0;margin:0 0 20px}
.pd-usp li{padding:6px 0;border-bottom:1px dashed var(--line);font-size:15px}
.pd-cta{display:flex;gap:12px;flex-wrap:wrap}
.pd-tabs{border-bottom:2px solid var(--line);margin:30px 0 0}
.pd-tabs .tab{display:inline-block;padding:12px 22px;background:var(--red);color:#fff;font-weight:700;border-radius:8px 8px 0 0}
.pd-desc{border:1px solid var(--line);border-top:none;padding:24px;border-radius:0 0 10px 10px}

/* rich content */
.rich{font-size:15.5px;line-height:1.7;overflow-wrap:break-word}
.rich img{margin:14px auto;border-radius:8px;height:auto}
.rich table{border-collapse:collapse;width:100%;margin:16px 0;overflow-x:auto;display:block}
.rich td,.rich th{border:1px solid var(--line);padding:8px 10px;font-size:14px}
.rich h2,.rich h3{margin-top:22px}
.rich a{color:var(--red)}
.rich ul{padding-left:20px}

/* pages */
.page-narrow{max-width:820px;padding-top:10px;padding-bottom:40px}
.page-narrow h1{font-size:32px}
.lead{font-size:18px;color:var(--muted)}
.why{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:16px 0 26px}
.why div{background:var(--bg);border-radius:10px;padding:18px}
.why h3{color:var(--red);font-size:18px}
.post-hero{border-radius:12px;margin:10px 0 20px}

/* contact */
.contact{display:grid;grid-template-columns:1fr 1fr;gap:34px;padding-bottom:44px}
.contact-list{list-style:none;padding:0;margin:0 0 20px}
.contact-list li{padding:8px 0;border-bottom:1px dashed var(--line);font-size:15px}
.contact-form{background:var(--bg);border-radius:12px;padding:26px}
.contact-form input,.contact-form textarea{width:100%;border:2px solid var(--line);border-radius:8px;padding:12px 14px;margin-bottom:12px;font-size:15px;font-family:inherit}
.contact-form input:focus,.contact-form textarea:focus{border-color:var(--red);outline:none}
.form-note{font-size:12px;color:var(--muted);margin:10px 0 0}

@media(max-width:1000px){
  .catgrid{grid-template-columns:repeat(4,1fr)}
  .pgrid{grid-template-columns:repeat(3,1fr)}
  .hero-in{grid-template-columns:1fr}
  .product{grid-template-columns:1fr}
  .contact{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  .hotbox,.search{display:none}
  .burger{display:block;margin-left:auto}
  .mainnav{display:none}
  .mainnav.open{display:block}
  .mainnav>.container>ul{flex-direction:column}
  .has-sub .sub{position:static;box-shadow:none;display:block;background:rgba(0,0,0,.15);min-width:auto}
  .sub a{color:#fff}
  .catgrid{grid-template-columns:repeat(2,1fr)}
  .pgrid{grid-template-columns:repeat(2,1fr)}
  .shop{grid-template-columns:1fr}
  .shop-side{order:2}
  .hero h1{font-size:30px}
  .why{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
}

/* loading / error (bản đọc từ Google Sheet) */
.lf-loading{grid-column:1/-1;display:flex;align-items:center;justify-content:center;gap:12px;padding:50px 0;color:var(--muted);font-size:15px}
.lf-spin{width:26px;height:26px;border:3px solid var(--line);border-top-color:var(--red);border-radius:50%;animation:lfspin .8s linear infinite}
@keyframes lfspin{to{transform:rotate(360deg)}}
.lf-err{grid-column:1/-1;color:var(--red);text-align:center;padding:30px;font-weight:500}

/* khối nội dung SEO (trang SP & danh mục) */
.seo-extra,.seo-content{margin-top:26px;padding-top:22px;border-top:1px solid var(--line)}
.seo-content{padding-bottom:10px}
.seo-extra h2,.seo-content h2{font-size:21px;margin:24px 0 10px;color:var(--dark)}
.seo-extra h3,.seo-content h3{font-size:16px;margin:16px 0 4px;color:var(--red)}
.seo-content h3 a{color:var(--red)}
.seo-content table{border-collapse:collapse;width:100%;margin:12px 0}
.seo-content th,.seo-content td{border:1px solid var(--line);padding:9px 12px;font-size:14px;text-align:left}
.seo-content thead th{background:var(--bg)}
.seo-showrooms{padding-left:20px}
.seo-showrooms li{padding:3px 0}