:root{--bg:#080808;--card:#111;--gold:#d6a63a;--gold2:#fff1a8;--text:#f7f2dc;--muted:#c8b98a;--line:#3a2b12}*{box-sizing:border-box}body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}a{color:inherit;text-decoration:none}.top{background:#000;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:9}.nav{max-width:1180px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:12px 18px}.brand{font-weight:900;color:var(--gold2);letter-spacing:.5px}.menu{display:flex;gap:18px;font-size:14px}.menu a:hover{color:var(--gold)}.hero{background:radial-gradient(circle at 50% 0,#33230d,#050505 65%);border-bottom:1px solid var(--line)}.wrap{max-width:1180px;margin:auto;padding:52px 18px}.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:34px;align-items:center}.eyebrow{color:var(--gold);font-weight:700;text-transform:uppercase;letter-spacing:1.5px}h1{font-size:48px;line-height:1.08;margin:12px 0;background:linear-gradient(#fff6bf,#d29b29 60%,#8a5a13);-webkit-background-clip:text;color:transparent}h2{font-size:34px;margin:0 0 18px;color:var(--gold2)}h3{margin:0 0 10px;color:var(--gold2)}.lead{font-size:19px;color:#eee0b0}.btns{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}.btn{display:inline-block;padding:13px 20px;border-radius:999px;font-weight:800}.primary{background:linear-gradient(90deg,#f4d66e,#ba7d17);color:#120c02}.ghost{border:1px solid var(--gold);color:var(--gold2)}.hero img,.project img{width:100%;border-radius:18px;border:1px solid var(--gold);box-shadow:0 20px 80px #000}.section{border-bottom:1px solid var(--line)}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}.card{background:linear-gradient(180deg,#15120d,#0b0b0b);border:1px solid var(--line);border-radius:18px;padding:22px}.card b{color:var(--gold2)}.products a{display:block}.price{font-size:28px;color:var(--gold2);font-weight:900}.steps{counter-reset:s}.step:before{counter-increment:s;content:counter(s);display:inline-grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--gold);color:#120c02;font-weight:900;margin-right:10px}.gallery{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.ph{height:180px;border-radius:16px;border:1px solid var(--line);background:linear-gradient(135deg,#2b210f,#0e0e0e);display:grid;place-items:center;color:var(--muted);text-align:center;padding:12px}.cta{background:linear-gradient(135deg,#211404,#050505);text-align:center}.form{display:grid;gap:12px;max-width:760px;margin:22px auto 0}.form input,.form textarea,.form select{padding:14px;border-radius:12px;border:1px solid var(--line);background:#070707;color:#fff}.footer{background:#000;padding:34px 18px;color:var(--muted)}.footer .wrap{padding:0}.floating{position:fixed;right:18px;bottom:18px;display:flex;flex-direction:column;gap:10px;z-index:10}.floating a{background:linear-gradient(90deg,#f4d66e,#ba7d17);color:#130d02;padding:12px 16px;border-radius:999px;font-weight:900;box-shadow:0 10px 30px #000}.crumb{color:var(--muted);font-size:14px;margin-bottom:12px}.faq details{background:#111;border:1px solid var(--line);border-radius:14px;padding:16px;margin:10px 0}.faq summary{cursor:pointer;font-weight:800;color:var(--gold2)}@media(max-width:850px){.menu{display:none}.hero-grid,.grid2,.grid3{grid-template-columns:1fr}h1{font-size:36px}.gallery{grid-template-columns:repeat(2,1fr)}.wrap{padding:38px 16px}}

/* Product catalog nâng cấp cho trang Cổng nhôm đúc */
.catalog-head{text-align:center;max-width:820px;margin:0 auto 30px}.catalog-head .eyebrow{margin-bottom:8px}.products-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:26px}.product-item{background:linear-gradient(180deg,#17130c,#080808);border:1px solid var(--line);border-radius:22px;overflow:hidden;box-shadow:0 18px 60px rgba(0,0,0,.35);transition:.25s ease}.product-item:hover{transform:translateY(-5px);border-color:var(--gold)}.product-image{position:relative;background:#fff;aspect-ratio:16/10;display:flex;align-items:center;justify-content:center;overflow:hidden}.product-image img{width:100%;height:100%;object-fit:contain;padding:14px;transition:.35s ease}.product-item:hover .product-image img{transform:scale(1.04)}.product-badge{position:absolute;left:14px;top:14px;background:linear-gradient(90deg,#f4d66e,#ba7d17);color:#130d02;border-radius:999px;padding:7px 13px;font-weight:900;font-size:13px}.product-content{padding:20px}.product-content h3{font-size:21px}.product-desc{color:#dccd9c;margin:0 0 16px}.product-features{display:grid;gap:7px;margin:0 0 18px;padding:0;list-style:none;color:#f4e7ba;font-size:14px}.product-features li:before{content:'✓ ';color:var(--gold);font-weight:900}.product-actions{display:flex;gap:10px;flex-wrap:wrap}.product-actions .btn{padding:11px 16px;font-size:14px;flex:1;text-align:center;min-width:135px}.mobile-cta-note{display:none;color:var(--muted);text-align:center;margin-top:16px}.sticky-mobile-call{display:none}
@media(max-width:850px){.products-grid{grid-template-columns:1fr;gap:18px}.product-content{padding:16px}.product-content h3{font-size:19px}.product-actions .btn{width:100%;flex:auto}.floating{display:none}.sticky-mobile-call{display:grid;grid-template-columns:1fr 1fr;gap:8px;position:fixed;left:10px;right:10px;bottom:10px;z-index:20}.sticky-mobile-call a{background:linear-gradient(90deg,#f4d66e,#ba7d17);color:#120c02;padding:12px 10px;border-radius:14px;text-align:center;font-weight:900;box-shadow:0 10px 30px #000}.mobile-cta-note{display:block}body{padding-bottom:76px}.product-image{aspect-ratio:4/3}.hero-grid{gap:20px}.btns .btn{width:100%;text-align:center}}
@media(max-width:520px){h1{font-size:32px}h2{font-size:27px}.wrap{padding:34px 14px}.nav{padding:10px 14px}.brand{font-size:15px}.product-badge{font-size:12px;padding:6px 10px}.products-grid{gap:16px}}

/* Bộ lọc catalog và tối ưu responsive 2026 */
.filter-bar{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin-top:18px}.filter-btn{border:1px solid var(--line);background:#0b0b0b;color:var(--gold2);border-radius:999px;padding:10px 16px;font-weight:800;cursor:pointer}.filter-btn.active,.filter-btn:hover{background:linear-gradient(90deg,#f4d66e,#ba7d17);color:#120c02;border-color:transparent}.product-item[style*="none"]{display:none!important}@media(min-width:851px) and (max-width:1100px){.products-grid{gap:20px}.product-content h3{font-size:18px}.product-actions .btn{min-width:120px}}@media(max-width:850px){.filter-bar{justify-content:flex-start;overflow-x:auto;flex-wrap:nowrap;padding-bottom:8px}.filter-btn{white-space:nowrap}.catalog-head{text-align:left}.products-grid{grid-template-columns:1fr}.product-image img{padding:8px}.product-desc{font-size:15px}}


/* Mobile menu điều hướng */
.mobile-menu-toggle{display:none;border:1px solid var(--gold);background:linear-gradient(180deg,#17130c,#050505);color:var(--gold2);border-radius:12px;width:44px;height:40px;font-size:26px;font-weight:900;line-height:1;cursor:pointer}
@media(max-width:850px){
  .top{z-index:1000}
  .nav{position:relative;gap:12px}
  .brand{max-width:calc(100% - 58px);line-height:1.25}
  .mobile-menu-toggle{display:grid;place-items:center;margin-left:auto}
  .menu{display:none;position:absolute;left:14px;right:14px;top:calc(100% + 10px);background:rgba(5,5,5,.98);border:1px solid var(--line);border-radius:18px;padding:10px;box-shadow:0 24px 70px rgba(0,0,0,.7);flex-direction:column;gap:0;max-height:calc(100vh - 90px);overflow:auto}
  body.mobile-menu-open .menu{display:flex}
  .menu a{display:block;padding:13px 14px;border-bottom:1px solid rgba(214,166,58,.18);font-size:15px;font-weight:800;color:var(--gold2)}
  .menu a:last-child{border-bottom:0}
  .menu a:hover{background:rgba(214,166,58,.12);border-radius:12px}
}