/* Tang Buy — Rebuild v2
 * Open source: plain HTML5 + CSS3 + vanilla JS. No framework, no build,
 * no CDN, no tracking. MIT.
 *
 * Visual direction: editorial / factory-direct. Original brand green
 * (#234f1a, taken from the old site's menu), paper background, serif
 * display type, hairline rules, square corners. No pill buttons, no
 * gradient cards, no emoji placeholders — the logo and photos are the
 * originals from tang-buy.com.
 */
:root{
  --green:#234f1a; --green-deep:#182f11; --green-soft:#eef2e9;
  --paper:#f7f5f0; --ink:#1b1b18; --muted:#66705f; --line:#d9d4c7; --line-dark:#1b1b18;
  --white:#ffffff; --max:1200px;
  --ease:cubic-bezier(.22,1,.36,1); /* smooth, decelerating — the "high-end" feel */
  --serif:"Songti SC","STSong","Noto Serif SC",Georgia,"Times New Roman",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);color:var(--ink);background:var(--white);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{max-width:var(--max);margin:0 auto;padding:0 28px}
.muted{color:var(--muted)}
h1,h2,h3{font-family:var(--serif);font-weight:600;line-height:1.25;letter-spacing:.01em}
::selection{background:var(--green);color:#fff}

/* ---------- Motion foundation ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important;scroll-behavior:auto !important}
}
.reveal{opacity:0;transform:translateY(24px);transition:opacity .9s var(--ease),transform .9s var(--ease);will-change:opacity,transform}
.reveal.in{opacity:1;transform:none}
.reveal[data-delay="1"]{transition-delay:.08s}.reveal[data-delay="2"]{transition-delay:.16s}
.reveal[data-delay="3"]{transition-delay:.24s}.reveal[data-delay="4"]{transition-delay:.32s}

/* ---------- Header ---------- */
header{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--line);transition:box-shadow .4s var(--ease)}
header.scrolled{box-shadow:0 1px 24px rgba(27,27,24,.08)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:76px;min-height:64px}
.brand{display:flex;align-items:center;gap:14px;min-width:0;flex:1 1 auto;overflow:hidden}
.brand img{height:52px;width:auto;max-width:100%;flex-shrink:0}
.brand-text{line-height:1.25}
.brand-text b{font-family:var(--serif);font-size:17px;display:block;white-space:nowrap}
.brand-text span{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);white-space:nowrap}
nav.main{display:flex;gap:34px}
nav.main a{position:relative;font-size:14px;letter-spacing:.08em;padding:6px 0;color:#3a3a36}
nav.main a::after{content:"";position:absolute;left:0;bottom:0;height:1px;width:100%;background:var(--green);transform:scaleX(0);transform-origin:left;transition:transform .45s var(--ease)}
nav.main a:hover::after,nav.main a.active::after{transform:scaleX(1)}
nav.main a.active{color:var(--green);font-weight:600}
.header-actions{display:flex;align-items:center;gap:12px;flex-shrink:0;white-space:nowrap}
.lang-switch{font-size:13px;letter-spacing:.06em;color:var(--muted);display:flex;align-items:center;flex-shrink:0;white-space:nowrap}
.lang-switch button{border:0;background:none;cursor:pointer;font:inherit;color:inherit;padding:4px 2px}
.lang-switch button.active{color:var(--green);font-weight:700;text-decoration:underline;text-underline-offset:4px}
.lang-switch i{font-style:normal;opacity:.5;margin:0 2px}
.menu-btn{display:none;border:1px solid var(--line);background:#fff;padding:8px 12px;cursor:pointer;font-size:16px;line-height:1}

/* ---------- Buttons / links ---------- */
.btn{display:inline-block;padding:13px 26px;background:var(--green);color:#fff;font-size:14px;letter-spacing:.08em;border:1px solid var(--green);cursor:pointer;transition:background .4s var(--ease),color .4s var(--ease),transform .4s var(--ease)}
.btn:hover{background:var(--green-deep);transform:translateY(-1px)}
.btn.outline{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn.outline:hover{background:var(--ink);color:#fff}
.arrow-link{font-size:14px;letter-spacing:.06em;border-bottom:1px solid var(--ink);padding-bottom:2px;transition:color .3s,border-color .3s}
.arrow-link:hover{color:var(--green);border-color:var(--green)}
.arrow-link .arr{display:inline-block;transition:transform .4s var(--ease)}
.arrow-link:hover .arr{transform:translateX(5px)}

/* ---------- Hero ---------- */
.hero{padding:72px 0 64px;border-bottom:1px solid var(--line);overflow:hidden}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center}
.kicker{font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--green);font-weight:700;margin:0 0 20px}
.kicker::before{content:"";display:inline-block;width:36px;height:1px;background:var(--green);vertical-align:middle;margin-right:12px}
.hero h1{font-size:clamp(30px,4.6vw,56px);margin:0 0 22px;text-wrap:balance;overflow-wrap:break-word}
.hero h1 em{font-style:normal;color:var(--green);white-space:nowrap}
.hero .lead{font-size:17px;color:#3f443c;max-width:560px;margin:0 0 32px}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.hero-media{position:relative}
.hero-media img{width:100%;aspect-ratio:3/4;object-fit:cover;transform:scale(1.07);transition:transform 1.6s var(--ease)}
.hero-media.loaded img{transform:scale(1)}
.hero-media figcaption{position:absolute;left:0;bottom:0;background:var(--white);border-top:1px solid var(--line);border-right:1px solid var(--line);padding:12px 18px;font-size:13px;letter-spacing:.04em}
.hero-media figcaption b{font-family:var(--serif)}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:0;margin-top:56px;border-top:1px solid var(--line)}
.stat{padding:22px 22px 0 0;border-right:1px solid var(--line);margin-right:22px}
.stat:last-child{border-right:0;margin-right:0}
.stat b{font-family:var(--serif);font-size:34px;font-weight:600;display:block;line-height:1.15}
.stat b span{font-size:inherit}
.stat>span{font-size:13px;color:var(--muted)}
/* 4th stat is a wordmark, not a number — keep it small so it never overflows */
.stat-long b{font-size:21px;line-height:1.4;letter-spacing:.02em;padding-top:4px}

/* ---------- Sections ---------- */
section{padding:76px 0}
section.paper{background:var(--paper)}
.section-head{max-width:720px;margin-bottom:44px}
.section-head .index{font-family:var(--serif);color:var(--green);font-size:14px;letter-spacing:.1em}
.section-head h2{font-size:clamp(26px,3.2vw,38px);margin:10px 0 14px}
.rule{height:1px;background:var(--line);border:0;margin:0}

/* About */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.about-grid h3{font-size:22px;margin:0 0 12px}
.about-list{list-style:none;padding:0;margin:28px 0 0}
.about-list li{display:flex;gap:16px;padding:18px 0;border-top:1px solid var(--line)}
.about-list li:last-child{border-bottom:1px solid var(--line)}
.about-list .n{font-family:var(--serif);color:var(--green);font-size:15px;min-width:28px}
.about-list b{display:block;font-size:15px}
.about-list p{margin:2px 0 0;color:var(--muted);font-size:14px}

/* Marquee — client names, slow, pauses on hover */
.marquee{border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow:hidden;padding:18px 0;background:var(--white)}
.marquee-track{display:flex;align-items:center;gap:56px;width:max-content;animation:marquee 36s linear infinite}
.marquee:hover .marquee-track{animation-play-state:paused}
.marquee-track img{height:34px;width:auto;flex-shrink:0;opacity:.92;transition:opacity .3s}
.marquee-track img:hover{opacity:1}
@keyframes marquee{to{transform:translateX(-50%)}}

/* Customers */
.customers-img{border:1px solid var(--line);background:#fff;padding:28px;transition:box-shadow .5s var(--ease)}
.customers-img:hover{box-shadow:0 18px 44px rgba(27,27,24,.09)}
.customers-img img{width:100%}
.note{font-size:13px;color:var(--muted);margin-top:14px}

/* ---------- Products ---------- */
.toolbar{display:flex;gap:20px;flex-wrap:wrap;align-items:center;justify-content:space-between;margin-bottom:12px}
.filters{display:flex;gap:0;flex-wrap:wrap;border:1px solid var(--line)}
.filter-btn{border:0;border-right:1px solid var(--line);background:#fff;padding:11px 18px;cursor:pointer;font:inherit;font-size:14px;transition:background .3s,color .3s}
.filter-btn:last-child{border-right:0}
.filter-btn:hover{background:var(--green-soft)}
.filter-btn.active{background:var(--green);color:#fff}
.search{border:1px solid var(--line);border-radius:0;padding:11px 14px;min-width:250px;font:inherit;background:#fff}
.search:focus{outline:1px solid var(--green);outline-offset:0}
.page-info{font-size:13px;color:var(--muted);letter-spacing:.05em;margin:18px 0 22px}
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px 24px}
.product-grid.switching{animation:gridIn .55s var(--ease)}
@keyframes gridIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.product{border:1px solid var(--line);background:#fff;cursor:pointer;transition:border-color .4s var(--ease),box-shadow .5s var(--ease),transform .5s var(--ease)}
.product:hover{border-color:var(--green);box-shadow:0 20px 44px rgba(27,27,24,.10);transform:translateY(-4px)}
.product-visual{overflow:hidden;aspect-ratio:3/2;background:#e9eef2}
.product-visual img{width:100%;height:100%;object-fit:cover;transform:scale(1.01);transition:transform .9s var(--ease)}
.product:hover .product-visual img{transform:scale(1.06)}
.product-body{padding:20px 20px 22px}
.product-body .no{font-size:12px;letter-spacing:.18em;color:var(--green);font-weight:700}
.product-body h3{margin:8px 0 4px;font-size:21px}
.product-body .en{font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.product-body p{margin:12px 0 16px;color:var(--muted);font-size:14px}
.product-meta{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);padding-top:14px;font-size:13px}
.product-meta .cat{letter-spacing:.06em}
.product-meta .view{transition:transform .4s var(--ease)}
.product:hover .product-meta .view{transform:translateX(4px)}
.pagination{display:flex;gap:0;justify-content:center;align-items:center;margin-top:44px;flex-wrap:wrap}
.page-btn{border:1px solid var(--line);border-left:0;background:#fff;padding:11px 16px;cursor:pointer;font:inherit;font-size:14px;transition:background .3s,color .3s;min-width:46px}
.page-btn:first-child{border-left:1px solid var(--line)}
.page-btn:hover{background:var(--green-soft)}
.page-btn.active{background:var(--green);color:#fff;border-color:var(--green)}
.page-btn:disabled{opacity:.4;cursor:not-allowed}

/* Lightbox */
.lightbox{position:fixed;inset:0;z-index:100;background:rgba(20,24,18,.92);display:flex;align-items:center;justify-content:center;padding:28px;opacity:0;pointer-events:none;transition:opacity .45s var(--ease)}
.lightbox.open{opacity:1;pointer-events:auto}
.lightbox figure{margin:0;max-width:980px;width:100%;transform:scale(.97);transition:transform .5s var(--ease)}
.lightbox.open figure{transform:scale(1)}
.lightbox img{width:100%;background:#fff}
.lightbox figcaption{display:flex;justify-content:space-between;gap:16px;color:#fff;padding-top:14px;font-size:14px}
.lightbox figcaption b{font-family:var(--serif);font-size:17px}
.lightbox-close{position:absolute;top:18px;right:22px;background:none;border:0;color:#fff;font-size:30px;cursor:pointer;line-height:1}
.lightbox-nav{position:absolute;top:50%;transform:translateY(-50%);background:none;border:1px solid rgba(255,255,255,.5);color:#fff;width:48px;height:48px;cursor:pointer;font-size:20px;transition:background .3s}
.lightbox-nav:hover{background:rgba(255,255,255,.15)}
.lightbox-nav.prev{left:18px}.lightbox-nav.next{right:18px}

/* ---------- Branch ---------- */
.factory-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.factory{border:1px solid var(--line);background:#fff;transition:box-shadow .5s var(--ease),transform .5s var(--ease)}
.factory:hover{box-shadow:0 20px 44px rgba(27,27,24,.10);transform:translateY(-4px)}
.factory img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .9s var(--ease)}
.factory:hover img{transform:scale(1.04)}
.factory .img-wrap{overflow:hidden}
.factory-body{padding:22px}
.factory-body h3{margin:0 0 8px;font-size:20px}
.factory-body p{margin:0;color:var(--muted);font-size:14px}
.factory-body .tagline{margin-top:14px;padding-top:14px;border-top:1px solid var(--line);font-size:13px;letter-spacing:.05em}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:start}
.contact-list{list-style:none;padding:0;margin:0}
.contact-list li{padding:18px 0;border-top:1px solid var(--line)}
.contact-list li:last-child{border-bottom:1px solid var(--line)}
.contact-list .k{font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:4px}
.contact-list .v{font-size:17px}
.contact-list a{border-bottom:1px solid var(--ink)}
.contact-list a:hover{color:var(--green);border-color:var(--green)}
form label{display:block;font-size:13px;letter-spacing:.08em;font-weight:600;margin:18px 0 8px}
form label:first-child{margin-top:0}
form input,form textarea{width:100%;border:1px solid var(--line);border-radius:0;padding:13px 14px;font:inherit;background:#fff;transition:border-color .3s,box-shadow .3s}
form input:focus,form textarea:focus{outline:none;border-color:var(--green);box-shadow:0 0 0 3px rgba(35,79,26,.12)}
form textarea{min-height:130px;resize:vertical}
.form-note{font-size:13px;color:var(--muted)}

/* ---------- Footer ---------- */
footer{background:var(--green-deep);color:#cfd6c8;padding:56px 0 28px}
footer .brand-text b{color:#fff}
footer .brand-text span{color:#9aa78f}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px}
footer h4{color:#fff;font-family:var(--serif);font-size:17px;margin:0 0 14px}
footer ul{list-style:none;padding:0;margin:0}
footer li{margin:10px 0;font-size:14px}
footer a{border-bottom:1px solid transparent;transition:border-color .3s,color .3s}
footer a:hover{color:#fff;border-color:#fff}
.copy{border-top:1px solid rgba(255,255,255,.16);margin-top:44px;padding-top:20px;font-size:13px;opacity:.85;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}

/* ---------- Responsive ---------- */
@media(max-width:960px){
  .header-inner{height:64px;gap:12px}
  .brand img{height:40px}
  .brand-text b{font-size:15px}
  .hero-grid,.about-grid,.contact-grid{grid-template-columns:1fr;gap:40px}
  .hero-media img{aspect-ratio:16/10}
  .product-grid,.factory-grid{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr);gap:28px 0}
  .stat{padding:0 18px 0 0;margin-right:18px}
  .stat:nth-child(2n){border-right:0;margin-right:0;padding-left:18px;padding-right:0}
  .stat-long b{font-size:19px}
  nav.main{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;gap:0;padding:8px 28px 16px;border-bottom:1px solid var(--line)}
  nav.main.open{display:flex}
  nav.main a{padding:12px 0;border-top:1px solid var(--line)}
  .menu-btn{display:block;flex-shrink:0}
  .footer-grid{grid-template-columns:1fr}
}
@media(max-width:600px){
  .container{padding:0 18px}
  section{padding:48px 0}
  /* Header: logo alone carries the name (it already prints the full
     company name in Chinese + English) — drop the duplicate text so
     logo + language + menu fit on one line without wrapping. */
  .header-inner{height:60px;gap:10px}
  .brand img{height:36px}
  .brand-text{display:none}
  .lang-switch{font-size:12px}
  .menu-btn{padding:7px 10px}
  /* Hero: smaller, balanced title; "童装制造" never splits */
  .hero{padding:40px 0}
  .hero h1{font-size:30px;line-height:1.35}
  .hero .lead{font-size:16px}
  .hero-cta .btn{padding:12px 20px}
  .hero-media figcaption{font-size:12px;padding:10px 12px}
  /* Stats: 2 columns, no overflow; the wordmark stat is full-width */
  .stats{grid-template-columns:1fr 1fr;gap:24px 0}
  .stat{padding:0 14px 0 0;margin-right:14px}
  .stat:nth-child(2n){padding-left:14px;padding-right:0}
  .stat b{font-size:26px}
  .stat span{font-size:12px}
  .stat-long{grid-column:1 / -1;border-top:1px solid var(--line);padding-top:20px}
  .stat-long b{font-size:18px;line-height:1.45}
  .product-grid,.factory-grid{grid-template-columns:1fr}
  .product-body h3{font-size:19px}
  .customers-img{padding:12px}
  .filters{width:100%}
  .filter-btn{flex:1 1 auto;padding:10px 10px;font-size:13px;text-align:center}
  .search{min-width:100%;font-size:16px}
  form input,form textarea{font-size:16px} /* stops iOS auto-zoom on focus */
  .marquee-track img{height:26px}
  .marquee-track{gap:32px}
  .about-list li{gap:12px}
  .section-head h2{font-size:26px}
  /* Lightbox: keep prev/next reachable on touch, docked at the bottom */
  .lightbox{padding:12px}
  .lightbox figcaption{flex-direction:column;gap:2px;font-size:13px}
  .lightbox-nav{display:block;top:auto;bottom:16px;transform:none;width:42px;height:42px;font-size:18px}
  .lightbox-nav.prev{left:16px}
  .lightbox-nav.next{right:16px}
}