*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--ink:#1a1a1a;--muted:#6b6b6b;--line:#e6e6e6;--accent:#111;--max:1200px;--gap:24px;--hero-h:600px}
html{scroll-behavior:smooth}
body{font-family:"Montserrat",system-ui,sans-serif;color:var(--ink);background:#fff;line-height:1.6;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}
/* header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.header-inner{max-width:var(--max);margin:0 auto;padding:16px 20px;display:flex;align-items:center;justify-content:space-between}
.logo{font-weight:700;font-size:24px;letter-spacing:3px}
.main-nav{display:flex;gap:28px}
.main-nav a{font-size:13px;font-weight:500;letter-spacing:1px;text-transform:uppercase;padding:4px 0;position:relative}
.main-nav a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--accent);transition:width .25s}
.main-nav a:hover::after{width:100%}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.nav-toggle span{width:24px;height:2px;background:var(--ink);transition:.3s}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
/* hero */
.hero{position:relative;height:var(--hero-h);background:#2b2b2b linear-gradient(180deg,#2b2b2b,#565656);background-size:cover;background-position:center;display:flex;align-items:center;justify-content:center;text-align:center;color:#fff}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.15),rgba(0,0,0,.45))}
.hero-content{position:relative;z-index:2;padding:20px;max-width:800px}
.hero-content h1{font-size:clamp(28px,5vw,52px);font-weight:700;letter-spacing:2px;text-shadow:0 2px 20px rgba(0,0,0,.4)}
.hero-content p{margin-top:14px;font-size:clamp(14px,2vw,18px);font-weight:300;letter-spacing:1px}
/* section head */
.section-head{text-align:center;margin:64px 0 32px}
.section-head h2{font-size:28px;font-weight:700;letter-spacing:2px;text-transform:uppercase}
.section-head p{margin:12px auto 0;max-width:620px;color:var(--muted);font-size:15px;font-weight:300}
.view-all{display:inline-block;margin-top:18px;font-size:12px;letter-spacing:1.5px;text-transform:uppercase;border-bottom:1px solid var(--ink);padding-bottom:3px}
/* product grid */
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--gap)}
.product-card{background:#fff;cursor:pointer;display:block;color:inherit;text-decoration:none}
.product-media{position:relative;width:100%;aspect-ratio:3/4;overflow:hidden;background:#f4f4f4;border:1px solid var(--line)}
.product-media img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.product-card:hover .product-media img{transform:scale(1.05)}
.product-info{padding:14px 4px 0;text-align:center}
.product-info .name{font-size:14px;font-weight:500;letter-spacing:.5px;text-transform:uppercase}
.product-info .sizes{font-size:11px;color:var(--muted);margin-top:4px}
.product-info .price{font-size:15px;font-weight:600;margin-top:8px}
.ph{display:flex;align-items:center;justify-content:center;height:100%;color:#bbb;font-size:12px;letter-spacing:1px}
/* collection detail */
.col-hero{background:#111;color:#fff;padding:70px 20px;text-align:center}
.col-hero h1{font-size:clamp(28px,5vw,44px);letter-spacing:2px;text-transform:uppercase}
.col-hero p{margin:14px auto 0;max-width:640px;color:#ccc;font-weight:300}
.crumbs{max-width:var(--max);margin:24px auto 0;padding:0 20px;font-size:13px;color:var(--muted)}
.crumbs a:hover{color:var(--ink)}

/* ===== TRANG CHI TIET SAN PHAM ===== */
.pd-top{display:grid;grid-template-columns:1fr 1fr;gap:48px;margin:28px auto 10px;align-items:start}
.pd-gallery{position:sticky;top:90px}
.pd-main{width:100%;aspect-ratio:3/4;overflow:hidden;background:#f2f2f2;border-radius:4px}
.pd-main img{width:100%;height:100%;object-fit:cover;display:block}
.pd-thumbs{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}
.pd-thumbs img{width:70px;height:93px;object-fit:cover;border-radius:4px;cursor:pointer;opacity:.6;border:2px solid transparent;transition:opacity .2s,border-color .2s}
.pd-thumbs img:hover{opacity:1}
.pd-thumbs img.active{opacity:1;border-color:#111}
.pd-info{padding-top:8px}
.pd-info h1{font-size:clamp(24px,3.5vw,34px);letter-spacing:1px;line-height:1.2}
.pd-price{font-size:22px;font-weight:600;margin:16px 0 20px;color:#111}
.pd-sizes{font-size:14px;color:#444;margin-bottom:18px}
.pd-sizes span{display:inline-block;font-weight:600;color:#111;margin-right:6px}
.pd-desc{font-size:15px;line-height:1.8;color:#555;font-weight:300;border-top:1px solid #eee;padding-top:20px}
.pd-back{display:inline-block;margin-top:26px;font-size:13px;letter-spacing:1px;text-transform:uppercase;color:#111;border-bottom:1px solid #111;padding-bottom:2px}
.pd-lifestyle{max-width:var(--max);margin:60px auto 0;padding:0 20px}
.pd-lifestyle h2{font-size:clamp(20px,3vw,28px);letter-spacing:1px;text-transform:uppercase;text-align:center;margin-bottom:8px}
.pd-life-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:16px;margin-top:28px}
.pd-life-item{overflow:hidden;border-radius:4px;background:#f2f2f2}
.pd-life-item img{width:100%;height:100%;object-fit:cover;display:block;aspect-ratio:4/3;transition:transform .5s}
.pd-life-item:hover img{transform:scale(1.04)}
@media(max-width:760px){
  .pd-top{grid-template-columns:1fr;gap:24px;margin-top:18px}
  .pd-gallery{position:static}
  .pd-life-grid{grid-template-columns:1fr}
}
.empty{text-align:center;padding:80px 20px;color:var(--muted)}
/* features / feedback */
.features{margin-top:72px}
.feature-row{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;margin-bottom:56px}
.feature-row.rev .feature-img{order:2}
.feature-img img,.feature-img .ph{width:100%;aspect-ratio:4/3;object-fit:cover;background:#f4f4f4;border:1px solid var(--line)}
.feature-text h3{font-size:24px;letter-spacing:1px;text-transform:uppercase;margin-bottom:14px}
.feature-text p{color:#444;font-weight:300;font-size:15px}
.feature-link{display:inline-block;margin-top:14px;font-size:13px;letter-spacing:1px;text-transform:uppercase;color:#111;border-bottom:1px solid #111;padding-bottom:2px}
a.feature-row.linked{text-decoration:none;color:inherit;transition:opacity .2s}
a.feature-row.linked:hover{opacity:.85}
@media(max-width:760px){.feature-row{grid-template-columns:1fr;gap:18px;margin-bottom:40px}.feature-row.rev .feature-img{order:0}}

/* footer */
.site-footer{background:#111;color:#eee;margin-top:80px;padding:56px 20px 32px}
.footer-inner{max-width:var(--max);margin:0 auto;display:flex;flex-wrap:wrap;gap:32px;justify-content:space-between}
.footer-brand{font-size:22px;font-weight:700;letter-spacing:3px}
.footer-col h4{font-size:13px;text-transform:uppercase;letter-spacing:1px;margin-bottom:12px;color:#fff}
.footer-col p,.footer-col a{font-size:14px;color:#bbb;font-weight:300}
.footer-col a:hover{color:#fff}
.social-links{display:flex;gap:16px;margin-top:8px}
.footer-bottom{text-align:center;margin-top:40px;padding-top:20px;border-top:1px solid #333;color:#888;font-size:13px}
/* modal (product detail) */
.modal{position:fixed;inset:0;z-index:200;display:none;align-items:center;justify-content:center;background:rgba(0,0,0,.6);padding:20px}
.modal.open{display:flex}
.modal-box{background:#fff;max-width:900px;width:100%;max-height:90vh;overflow:auto;display:grid;grid-template-columns:1fr 1fr}
.modal-imgs{background:#f4f4f4}
.modal-imgs img{width:100%;aspect-ratio:3/4;object-fit:cover}
.modal-imgs .thumbs{display:flex;gap:8px;padding:8px}
.modal-imgs .thumbs img{width:60px;height:76px;cursor:pointer;border:1px solid var(--line)}
.modal-info{padding:32px}
.modal-info h3{font-size:22px;letter-spacing:1px;text-transform:uppercase}
.modal-info .price{font-size:20px;font-weight:600;margin:14px 0}
.modal-info .sizes{color:var(--muted);font-size:13px;margin-bottom:16px}
.modal-info .desc{color:#444;font-weight:300}
.modal-close{position:absolute;top:20px;right:24px;color:#fff;font-size:30px;cursor:pointer;z-index:201}
@media(max-width:900px){.product-grid{grid-template-columns:repeat(2,1fr)}.modal-box{grid-template-columns:1fr}}
@media(max-width:760px){
 .main-nav{position:fixed;top:61px;right:0;width:70%;max-width:320px;height:calc(100vh - 61px);background:#fff;flex-direction:column;gap:0;padding:20px;transform:translateX(100%);transition:transform .3s;box-shadow:-4px 0 20px rgba(0,0,0,.1)}
 .main-nav.open{transform:translateX(0)}
 .main-nav a{padding:14px 0;border-bottom:1px solid var(--line);width:100%}
 .nav-toggle{display:flex}
}
@media(max-width:480px){.product-grid{gap:14px}.section-head{margin:44px 0 24px}.section-head h2{font-size:22px}}