/* ==========================================================================
   AOYING · Hangzhou Allin Building Materials Technology Co., Ltd.
   Static site stylesheet — zero dependency, no build step.
   ========================================================================== */

:root{
  --ink:#141414;
  --ink-2:#4a4a4a;
  --ink-3:#8a8a8a;
  --line:#e6e4e0;
  --bg:#ffffff;
  --bg-soft:#f7f5f2;
  --oak:#b08154;
  --oak-deep:#8a6440;
  --max:1240px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Inter","Helvetica Neue",-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 28px}

/* ---------- header ---------- */
header{
  position:fixed;top:0;left:0;right:0;z-index:50;
  background:rgba(255,255,255,.92);backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.hd{display:flex;align-items:center;justify-content:space-between;height:72px;gap:24px}
.logo{display:flex;align-items:center;gap:12px;flex-shrink:0}
.logo .mark-img{height:34px;width:auto;display:block}
.logo .mark{width:30px;height:30px;border:1.5px solid var(--ink);display:grid;place-items:center;font-size:13px;font-weight:600;letter-spacing:.5px}
.logo .name{font-size:15px;font-weight:600;letter-spacing:1px;line-height:1.2}
.logo .name small{display:block;font-size:9.5px;font-weight:400;color:var(--ink-3);letter-spacing:1.4px}
nav.main{display:flex;gap:34px;margin-left:auto}
nav.main a{font-size:14px;color:var(--ink-2);position:relative;padding:4px 0;transition:color .2s}
nav.main a:hover{color:var(--ink)}
nav.main a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:1px;background:var(--ink);transition:width .25s}
nav.main a:hover::after{width:100%}
nav.main a.active{color:var(--ink);font-weight:500}
nav.main a.active::after{width:100%}
.hd-right{display:flex;align-items:center;gap:18px;flex-shrink:0}
.lang{display:flex;border:1px solid var(--line);border-radius:2px;overflow:hidden;font-size:12px}
.lang button{background:none;border:0;padding:6px 11px;cursor:pointer;color:var(--ink-3);font-family:inherit;transition:.2s}
.lang button.on{background:var(--ink);color:#fff}
.btn{display:inline-block;font-size:13.5px;letter-spacing:.6px;padding:12px 26px;border:1px solid var(--ink);cursor:pointer;
  background:var(--ink);color:#fff;transition:.22s;font-family:inherit}
.btn:hover{background:transparent;color:var(--ink)}
.btn.ghost{background:transparent;color:var(--ink)}
.btn.ghost:hover{background:var(--ink);color:#fff}
.btn.sm{padding:9px 20px;font-size:12.5px}
.burger{display:none;background:none;border:0;cursor:pointer;padding:6px}
.burger span{display:block;width:20px;height:1.5px;background:var(--ink);margin:4px 0}

/* ---------- hero (home) ---------- */
.hero{position:relative;height:88vh;min-height:560px;overflow:hidden;margin-top:72px}
.hero img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero .veil{position:absolute;inset:0;background:linear-gradient(90deg,rgba(255,255,255,.90) 0%,rgba(255,255,255,.72) 42%,rgba(255,255,255,.10) 78%)}
.hero .inner{position:relative;z-index:2;max-width:var(--max);margin:0 auto;padding:0 28px;height:100%;display:flex;flex-direction:column;justify-content:center}
.kicker{font-size:11.5px;letter-spacing:3.2px;text-transform:uppercase;color:var(--oak);margin-bottom:22px}
.hero h1{font-size:clamp(34px,5.2vw,66px);font-weight:600;line-height:1.14;letter-spacing:-1px;max-width:640px}
.hero p.lead{margin-top:24px;font-size:16.5px;color:var(--ink-2);max-width:460px}
.hero .cta{margin-top:38px;display:flex;gap:14px;flex-wrap:wrap}
.hero .stats{position:absolute;left:0;right:0;bottom:0;z-index:2;border-top:1px solid rgba(255,255,255,.4)}
.hero .stats .wrap{display:flex;flex-wrap:wrap}
.hero .stat{padding:22px 46px 22px 0;margin-right:46px;border-right:1px solid var(--line)}
.hero .stat b{display:block;font-size:26px;font-weight:600;letter-spacing:-.5px}
.hero .stat span{font-size:12px;color:var(--ink-3);letter-spacing:.8px}

/* ---------- page hero (inner pages) ---------- */
.page-hero{margin-top:72px;background:var(--bg-soft);border-bottom:1px solid var(--line);padding:76px 0 60px}
.page-hero .kicker{margin-bottom:16px}
.page-hero h1{font-size:clamp(28px,3.8vw,46px);font-weight:600;letter-spacing:-.8px;line-height:1.16;max-width:760px}
.page-hero p{margin-top:18px;font-size:15.5px;color:var(--ink-2);max-width:620px}
.crumb{margin-top:26px;font-size:12px;color:var(--ink-3);letter-spacing:.6px}
.crumb a:hover{color:var(--ink)}
.crumb span{margin:0 7px;color:var(--line)}

/* ---------- section frame ---------- */
section{padding:110px 0}
section.soft{background:var(--bg-soft)}
section.tight{padding:76px 0}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:30px;margin-bottom:56px}
.sec-head h2{font-size:clamp(26px,3.4vw,40px);font-weight:600;letter-spacing:-.6px;line-height:1.2}
.sec-head .sub{margin-top:14px;color:var(--ink-3);font-size:14.5px;max-width:520px}
.num{font-size:11px;letter-spacing:2.5px;color:var(--oak);display:block;margin-bottom:14px}
.rule{width:44px;height:1px;background:var(--ink);margin-top:22px}

/* ---------- categories ---------- */
.cats{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;background:var(--line)}
.cat{background:#fff;padding:0;transition:.25s;cursor:pointer;display:block}
.cat .ph{overflow:hidden;aspect-ratio:4/5;background:#eee}
.cat img{width:100%;height:100%;object-fit:cover;transition:transform .8s cubic-bezier(.2,.7,.3,1)}
.cat:hover img{transform:scale(1.05)}
.cat .body{padding:30px 28px 34px}
.cat h3{font-size:21px;font-weight:600;letter-spacing:-.2px}
.cat h3 em{display:block;font-style:normal;font-size:11.5px;letter-spacing:2px;color:var(--ink-3);font-weight:400;margin-top:6px;text-transform:uppercase}
.cat p{margin-top:14px;font-size:13.8px;color:var(--ink-2)}
.cat .go{margin-top:22px;font-size:12.5px;letter-spacing:1.2px;color:var(--ink);display:inline-flex;align-items:center;gap:8px}
.cat .go::after{content:"\2192";transition:transform .25s}
.cat:hover .go::after{transform:translateX(5px)}

/* ---------- products ---------- */
.filters{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:38px}
.filters button{background:none;border:1px solid var(--line);padding:9px 20px;font-size:13px;cursor:pointer;color:var(--ink-2);font-family:inherit;transition:.2s;border-radius:2px}
.filters button.on,.filters button:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;background:var(--line)}
.card{background:#fff;cursor:pointer;display:flex;flex-direction:column}
.card .ph{overflow:hidden;aspect-ratio:4/3;background:#eee}
.card img{width:100%;height:100%;object-fit:cover;transition:transform .8s cubic-bezier(.2,.7,.3,1)}
.card:hover img{transform:scale(1.04)}
.card .body{padding:24px 24px 26px;flex:1;display:flex;flex-direction:column}
.card .tag{font-size:10.5px;letter-spacing:1.6px;color:var(--oak);text-transform:uppercase;margin-bottom:10px}
.card h4{font-size:16.5px;font-weight:600;line-height:1.35}
.card h4 em{display:block;font-style:normal;font-weight:400;font-size:12px;color:var(--ink-3);margin-top:5px}
.specs{margin-top:18px;padding-top:16px;border-top:1px solid var(--line);display:grid;gap:6px}
.specs div{display:flex;justify-content:space-between;font-size:12.2px;color:var(--ink-2)}
.specs div span:first-child{color:var(--ink-3)}
.card .foot{margin-top:18px;display:flex;justify-content:space-between;align-items:center}
.card .foot .inq{font-size:12.5px;letter-spacing:1px;border-bottom:1px solid var(--ink);padding-bottom:2px}
.hide{display:none !important}

/* ---------- process ---------- */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:2px;background:var(--line)}
.step{background:#fff;padding:34px 24px}
.step b{font-size:12px;color:var(--oak);letter-spacing:1.5px}
.step h4{font-size:16px;font-weight:600;margin-top:14px}
.step h4 em{display:block;font-style:normal;font-size:11px;color:var(--ink-3);font-weight:400;letter-spacing:1.4px;margin-top:4px}
.step p{font-size:12.8px;color:var(--ink-2);margin-top:12px}

/* ---------- strength ---------- */
.strength{display:grid;grid-template-columns:1.05fr 1fr;gap:2px;background:var(--line)}
.strength .ph{overflow:hidden;min-height:420px}
.strength img{width:100%;height:100%;object-fit:cover}
.strength .body{background:#fff;padding:52px 48px}
.kv{display:grid;grid-template-columns:1fr 1fr;gap:36px 30px;margin-top:44px}
.kv b{font-size:34px;font-weight:600;letter-spacing:-1px;display:block}
.kv span{font-size:12.5px;color:var(--ink-3);letter-spacing:.5px}
.plist{margin-top:44px;display:grid;gap:14px}
.plist li{list-style:none;font-size:14px;color:var(--ink-2);padding-left:20px;position:relative}
.plist li::before{content:"";position:absolute;left:0;top:11px;width:8px;height:1px;background:var(--oak)}

/* ---------- cases ---------- */
.cases{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;background:var(--line)}
.case{background:#fff}
.case .ph{overflow:hidden;aspect-ratio:3/4}
.case img{width:100%;height:100%;object-fit:cover;transition:transform .8s cubic-bezier(.2,.7,.3,1)}
.case:hover img{transform:scale(1.04)}
.case .body{padding:24px 24px 28px}
.case h4{font-size:16px;font-weight:600}
.case h4 em{display:block;font-style:normal;font-size:11.5px;color:var(--ink-3);font-weight:400;margin-top:5px;letter-spacing:.6px}
.case p{margin-top:12px;font-size:13px;color:var(--ink-2)}

/* ---------- inquiry ---------- */
.inq-wrap{display:grid;grid-template-columns:1fr 1.15fr;gap:2px;background:var(--line)}
.inq-l{background:var(--ink);color:#fff;padding:58px 48px}
.inq-l h2{font-size:32px;font-weight:600;letter-spacing:-.5px;line-height:1.2}
.inq-l p{margin-top:20px;font-size:14.5px;color:rgba(255,255,255,.68)}
.contacts{margin-top:46px;display:grid;gap:22px}
.contacts div span{display:block;font-size:11px;letter-spacing:2px;color:rgba(255,255,255,.45);text-transform:uppercase}
.contacts div b{font-weight:500;font-size:15px;margin-top:4px;display:block}
.contacts .line2{display:block}
.contacts a{color:#fff;border-bottom:1px solid rgba(255,255,255,.3)}
.contacts a:hover{border-color:#fff}
.inq-r{background:#fff;padding:52px 48px}
.frm{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.field{display:flex;flex-direction:column;gap:8px}
.field.full{grid-column:1/-1}
.field label{font-size:12px;letter-spacing:.8px;color:var(--ink-3)}
.field input,.field select,.field textarea{
  border:0;border-bottom:1px solid var(--line);padding:10px 2px;font-size:14px;font-family:inherit;
  background:transparent;color:var(--ink);outline:none;transition:border-color .2s;border-radius:0;width:100%}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--ink)}
.field textarea{resize:vertical;min-height:88px}
.frm .btn{grid-column:1/-1;justify-self:start;margin-top:8px}
.ok-msg{grid-column:1/-1;font-size:13.5px;color:var(--oak-deep);display:none;line-height:1.6}
.hp{position:absolute;left:-9999px;opacity:0;height:0;overflow:hidden}

/* ---------- info blocks ---------- */
.info-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;background:var(--line)}
.info-grid .item{background:#fff;padding:40px 34px}
.info-grid .item h4{font-size:17px;font-weight:600;margin-bottom:12px}
.info-grid .item p{font-size:13.8px;color:var(--ink-2)}
.info-grid .item .idx{font-size:11px;letter-spacing:2px;color:var(--oak);display:block;margin-bottom:16px}

.map-row{display:grid;grid-template-columns:1fr 1fr;gap:2px;background:var(--line)}
.map-row .col{background:#fff;padding:44px 40px}
.map-row h3{font-size:19px;font-weight:600;margin-bottom:18px}
.map-row dl{display:grid;gap:16px}
.map-row dt{font-size:11px;letter-spacing:1.8px;color:var(--ink-3);text-transform:uppercase}
.map-row dd{font-size:14.5px;color:var(--ink);margin-top:3px}

/* ---------- cta strip ---------- */
.cta-strip{background:var(--ink);color:#fff;padding:78px 0}
.cta-strip .inner{display:flex;align-items:center;justify-content:space-between;gap:40px;flex-wrap:wrap}
.cta-strip h2{font-size:clamp(22px,2.8vw,34px);font-weight:600;letter-spacing:-.5px;max-width:620px;line-height:1.25}
.cta-strip p{margin-top:12px;color:rgba(255,255,255,.6);font-size:14.5px;max-width:560px}
.cta-strip .btn{background:#fff;color:var(--ink);border-color:#fff}
.cta-strip .btn:hover{background:transparent;color:#fff}

/* ---------- footer ---------- */
footer{background:#0e0e0e;color:#8b8b8b;padding:70px 0 34px;font-size:13px}
.ft{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
.ft .brand .ft-logo{height:44px;width:auto;display:block;margin-bottom:16px}
.ft .brand .name{color:#fff;font-size:16px;font-weight:600;letter-spacing:1px}
.ft .brand .name small{display:block;font-size:10px;color:#666;letter-spacing:1.4px;font-weight:400;margin-top:4px}
.ft .brand p{margin-top:18px;color:#777;max-width:280px}
.ft h5{color:#fff;font-size:12.5px;letter-spacing:1.6px;margin-bottom:18px;font-weight:500}
.ft ul{list-style:none;display:grid;gap:11px}
.ft a:hover{color:#fff}
.ft-bottom{margin-top:56px;padding-top:26px;border-top:1px solid #232323;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;color:#5c5c5c;font-size:12px}
.ft-bottom a:hover{color:#fff}

/* ---------- modal ---------- */
.modal{position:fixed;inset:0;z-index:80;background:rgba(15,15,15,.55);display:none;align-items:center;justify-content:center;padding:26px}
.modal.on{display:flex}
.modal .box{background:#fff;max-width:880px;width:100%;max-height:88vh;overflow:auto;display:grid;grid-template-columns:1fr 1fr;position:relative}
.modal .box img{width:100%;height:100%;object-fit:cover;min-height:380px}
.modal .info{padding:44px 40px}
.modal .close{position:absolute;top:14px;right:16px;background:#fff;border:1px solid var(--line);width:32px;height:32px;border-radius:50%;cursor:pointer;font-size:16px;line-height:1}
.modal h3{font-size:22px;font-weight:600;letter-spacing:-.3px}
.modal h3 em{display:block;font-style:normal;font-size:12px;color:var(--ink-3);font-weight:400;margin-top:6px}
.modal .tbl{margin-top:28px;display:grid;gap:0}
.modal .tbl div{display:flex;justify-content:space-between;gap:20px;padding:12px 0;border-bottom:1px solid var(--line);font-size:13.3px}
.modal .tbl div span:first-child{color:var(--ink-3)}
.modal .desc{margin-top:24px;font-size:13.8px;color:var(--ink-2)}

/* ---------- e-business card ---------- */
.card-row{display:grid;grid-template-columns:1.5fr 1fr;gap:48px;align-items:center}
.card-fig{margin:0}
.card-fig img{width:100%;display:block;border-radius:6px;box-shadow:0 18px 50px rgba(0,0,0,.16)}
.card-fig figcaption{margin-top:14px;font-size:13px}
.card-fig figcaption a{color:var(--ink-2);border-bottom:1px solid var(--line)}
.qr-col{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.qr{text-align:center;display:block;color:inherit;text-decoration:none}
.qr img{width:120px;height:120px;display:block;margin:0 auto 10px;border:1px solid var(--line);border-radius:4px;padding:8px;background:#fff}
.qr b{display:block;font-size:14px;letter-spacing:1px;color:var(--ink)}
.qr span{display:block;font-size:12px;color:var(--ink-3);margin-top:4px}
@media(max-width:860px){.card-row{grid-template-columns:1fr;gap:36px}.qr-col{grid-template-columns:1fr 1fr;max-width:360px}}

/* ---------- reveal ----------
   默认全部可见（无 JS / 打印 / 爬虫 / 截图都安全）；
   只有 JS 就绪后给 <html> 加了 js-anim 类，才启用入场动画 */
.rv{opacity:1;transform:none}
html.js-anim .rv{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
html.js-anim .rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html.js-anim .rv{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ---------- responsive ---------- */
@media (max-width:960px){
  nav.main{display:none}
  .burger{display:block}
  nav.main.open{display:flex;position:fixed;top:72px;left:0;right:0;background:#fff;flex-direction:column;gap:0;padding:10px 28px 22px;border-bottom:1px solid var(--line);margin-left:0}
  nav.main.open a{padding:13px 0;border-bottom:1px solid var(--line)}
  .cats,.grid,.cases,.info-grid,.map-row{grid-template-columns:1fr}
  .steps{grid-template-columns:repeat(2,1fr)}
  .strength,.inq-wrap,.modal .box{grid-template-columns:1fr}
  .strength .ph{min-height:260px}
  .hero{height:auto;min-height:0;padding:90px 0 0}
  .hero .inner{padding-top:60px;padding-bottom:50px}
  .hero .veil{background:linear-gradient(180deg,rgba(255,255,255,.92) 0%,rgba(255,255,255,.75) 100%)}
  .hero .stats{position:static}
  .hero .stat{border:0;padding:16px 26px 0 0;margin-right:26px}
  section{padding:74px 0}
  .page-hero{padding:56px 0 44px}
  .frm{grid-template-columns:1fr}
  .ft{grid-template-columns:1fr 1fr}
  .sec-head{flex-direction:column;align-items:flex-start}
  .inq-l,.inq-r,.map-row .col{padding:42px 30px}
}