:root{
  --ink:#111214; --muted:#6b7280; --line:#e7e7e9; --bg:#fff; --soft:#f6f6f7;
  --accent:#111214; --sale:#c0392b; --radius:14px; --max:1240px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font:15px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--bg)}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.muted{color:var(--muted)}

/* header */
.hdr{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line)}
.hdr-in{display:flex;align-items:center;gap:28px;height:64px}
.logo{font-weight:800;letter-spacing:.16em;font-size:18px}
.logo.sm{letter-spacing:.14em;font-size:15px;margin-bottom:8px}
.nav{display:flex;gap:22px;flex:1}
.nav a{font-size:14px;color:#333;padding:6px 0;border-bottom:1px solid transparent}
.nav a:hover{border-color:#111}
.hdr-right{display:flex;align-items:center;gap:14px}
.search input{border:1px solid var(--line);background:var(--soft);border-radius:999px;padding:9px 14px;width:230px;font-size:13px;outline:none}
.search input:focus{border-color:#bbb;background:#fff}
.cart-btn{font-size:14px;border:1px solid var(--line);border-radius:999px;padding:8px 14px}
.badge{display:inline-grid;place-items:center;min-width:20px;height:20px;border-radius:999px;background:#111;color:#fff;font-size:11px;margin-left:6px;padding:0 5px}

/* hero */
.hero{background:linear-gradient(120deg,#f4f4f5,#ececee);border-bottom:1px solid var(--line)}
.hero-in{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;padding:56px 0}
.hero h1{font-size:clamp(30px,4vw,52px);line-height:1.05;margin:0 0 14px;letter-spacing:-.02em}
.hero p{color:var(--muted);margin:0 0 22px;max-width:46ch}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:12px 22px;border-radius:999px;font-size:14px;border:0;cursor:pointer}
.btn.ghost{background:#fff;color:#111;border:1px solid #111}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.hero-art{aspect-ratio:4/3;border-radius:20px;background:#ddd center/cover no-repeat;box-shadow:0 20px 50px rgba(0,0,0,.08)}

/* sections */
.sec{padding-top:44px;padding-bottom:44px}
.sec-h{display:flex;align-items:end;justify-content:space-between;margin-bottom:18px}
.sec-h h2{font-size:22px;margin:0;letter-spacing:-.01em}
.sec-h a{font-size:13px;color:var(--muted)}

/* dept cards */
.depts{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.dept{position:relative;border-radius:var(--radius);overflow:hidden;aspect-ratio:4/3;background:linear-gradient(135deg,#f4f4f5,#e9e9eb)}
.dept img{width:100%;height:100%;object-fit:cover;object-position:center;transition:transform .5s}
.dept:hover img{transform:scale(1.04)}
.dept span{position:absolute;left:14px;bottom:12px;background:rgba(255,255,255,.92);padding:7px 12px;border-radius:999px;font-size:13px;font-weight:600}

/* grid */
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px 16px}
.card{position:relative}
.card .ph{aspect-ratio:1/1;border-radius:12px;overflow:hidden;background:var(--soft)}
.card .ph img{width:100%;height:100%;object-fit:cover;transition:transform .45s}
.card:hover .ph img{transform:scale(1.05)}
.card h3{font-size:13.5px;font-weight:500;margin:10px 0 3px;line-height:1.35;min-height:2.7em}
.card .brand{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}
.price{font-size:14px;font-weight:700}
.price s{color:#9ca3af;font-weight:400;margin-left:6px;font-size:12px}
.tag-sale{position:absolute;top:10px;left:10px;background:var(--sale);color:#fff;font-size:11px;padding:3px 8px;border-radius:999px}

/* filters */
.toolbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:20px}
.chip{border:1px solid var(--line);border-radius:999px;padding:7px 13px;font-size:13px;background:#fff;cursor:pointer}
.chip.on{background:#111;color:#fff;border-color:#111}
select{border:1px solid var(--line);border-radius:10px;padding:8px 10px;font-size:13px;background:#fff}

/* product page */
.pdp{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;padding-top:34px;padding-bottom:10px}
.pdp-img{border-radius:16px;overflow:hidden;background:var(--soft);aspect-ratio:1/1}
.pdp-img img{width:100%;height:100%;object-fit:cover}
.pdp h1{font-size:26px;margin:6px 0 10px;letter-spacing:-.01em}
.pdp .price{font-size:22px;margin:14px 0}
.opts{margin:16px 0}
.opt-name{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.sizes{display:flex;flex-wrap:wrap;gap:8px}
.size{border:1px solid var(--line);border-radius:10px;padding:9px 14px;font-size:13px;cursor:pointer;background:#fff}
.size.on{border-color:#111;box-shadow:inset 0 0 0 1px #111}
.size.off{opacity:.4;text-decoration:line-through;cursor:not-allowed}
.desc{color:#444;font-size:14px;border-top:1px solid var(--line);margin-top:22px;padding-top:18px}

/* cart / checkout */
.cart{display:grid;grid-template-columns:1.4fr .8fr;gap:36px;padding-top:26px;padding-bottom:10px}
.line{display:grid;grid-template-columns:92px 1fr auto;gap:14px;align-items:center;padding:14px 0;border-bottom:1px solid var(--line)}
.line img{width:92px;height:92px;object-fit:cover;border-radius:10px;background:var(--soft)}
.qty{display:inline-flex;align-items:center;border:1px solid var(--line);border-radius:8px}
.qty button{border:0;background:#fff;width:30px;height:30px;cursor:pointer;font-size:15px}
.qty span{min-width:28px;text-align:center;font-size:13px}
.summary{background:var(--soft);border-radius:var(--radius);padding:22px;height:max-content;position:sticky;top:84px}
.row{display:flex;justify-content:space-between;margin:8px 0;font-size:14px}
.row.total{font-size:17px;font-weight:700;border-top:1px solid #ddd;padding-top:12px;margin-top:14px}
.form{display:grid;gap:12px;margin-top:16px}
.form label{font-size:12px;color:var(--muted);display:block;margin-bottom:5px}
.form input,.form select{width:100%;border:1px solid var(--line);border-radius:10px;padding:11px 12px;font-size:14px;background:#fff}
.form .two{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.note{font-size:12px;color:var(--muted);margin-top:10px}
.done{text-align:center;padding:60px 0}
.done h2{font-size:26px;margin:0 0 8px}
.empty{padding-top:70px;padding-bottom:70px;text-align:center;color:var(--muted)}

/* footer */
.ftr{border-top:1px solid var(--line);margin-top:50px;padding:36px 0 26px;background:#fafafa}
.ftr-in{display:grid;grid-template-columns:1.2fr 1fr;gap:30px}
.ftr-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.ftr h4{font-size:12px;letter-spacing:.1em;text-transform:uppercase;margin:0 0 10px;color:#111}
.ftr a{display:block;font-size:13px;color:var(--muted);margin:6px 0}
.copy{color:#9ca3af;font-size:12px;margin-top:26px}

@media(max-width:1080px){.grid{grid-template-columns:repeat(3,1fr)}.depts{grid-template-columns:repeat(2,1fr)}}
@media(max-width:820px){
  .hdr-in{height:auto;padding:12px 0;flex-wrap:wrap;gap:12px}
  .nav{order:3;width:100%;overflow:auto;gap:16px}
  .hero-in{grid-template-columns:1fr;padding:36px 0}
  .grid{grid-template-columns:repeat(2,1fr)}
  .pdp,.cart,.ftr-in{grid-template-columns:1fr}
  .summary{position:static}
}