/* ============================================================
   念岂空间艺术 · 官网样式  v1.0（2026-10-14）
   设计基调：黑白极简 · 大图 · 设计机构形象
   ============================================================ */
:root{
  --ink:#111110;
  --paper:#ffffff;
  --grey:#f5f5f2;
  --line:#e6e6e2;
  --mut:#8b8b86;
  --w:1280px;
  --pad:clamp(20px,5vw,64px);
  --sec:clamp(72px,11vw,150px);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  color:var(--ink);background:var(--paper);
  font-size:16px;line-height:1.8;letter-spacing:.02em;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}

/* ---------- 通用 ---------- */
.wrap{max-width:var(--w);margin:0 auto;padding:0 var(--pad)}
.en{font-size:11px;letter-spacing:.38em;text-transform:uppercase;color:var(--mut);font-weight:500}
.sec{padding:var(--sec) 0}
.sec-head{margin-bottom:clamp(36px,5vw,64px)}
.sec-head h2{
  font-size:clamp(30px,4.4vw,52px);font-weight:600;line-height:1.25;
  letter-spacing:.04em;margin-top:14px;
}
.fx{opacity:0;transform:translateY(26px);transition:opacity .9s ease,transform .9s ease}
.fx.in{opacity:1;transform:none}
.fx.d1{transition-delay:.12s}.fx.d2{transition-delay:.24s}.fx.d3{transition-delay:.36s}

.btn{
  display:inline-block;padding:14px 38px;border:1px solid currentColor;
  font-size:13px;letter-spacing:.28em;text-transform:uppercase;
  transition:.35s;font-weight:500;
}
.btn:hover{background:var(--ink);color:#fff;border-color:var(--ink)}
.btn.lt{border-color:rgba(255,255,255,.85);color:#fff}
.btn.lt:hover{background:#fff;color:var(--ink);border-color:#fff}

/* ---------- 页头 ---------- */
.site-head{
  position:fixed;inset:0 0 auto 0;z-index:90;height:76px;
  display:flex;align-items:center;
  transition:background .4s,box-shadow .4s;
}
.site-head .wrap{width:100%;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:12px;color:#fff;transition:color .4s}
.brand img{height:40px;width:auto}
.brand .logo-d{display:none}
.brand-name{font-size:16px;letter-spacing:.14em;font-weight:600;line-height:1.3}
.brand-name small{display:block;font-size:9px;letter-spacing:.3em;font-weight:400;opacity:.75}
.site-head nav{display:flex;gap:clamp(20px,3vw,44px)}
.site-head nav a{
  color:#fff;font-size:14px;letter-spacing:.16em;position:relative;padding:6px 0;
  transition:color .4s;
}
.site-head nav a::after{
  content:"";position:absolute;left:0;bottom:0;width:0;height:1px;background:currentColor;transition:width .3s;
}
.site-head nav a:hover::after,.site-head nav a.on::after{width:100%}
.site-head.scrolled{background:rgba(255,255,255,.94);backdrop-filter:blur(10px);box-shadow:0 1px 0 var(--line)}
.site-head.scrolled .brand,.site-head.scrolled nav a{color:var(--ink)}
.site-head.scrolled .brand .logo-w{display:none}
.site-head.scrolled .brand .logo-d{display:block}
.nav-tgl{display:none;background:none;border:0;cursor:pointer;padding:8px}
.nav-tgl span{display:block;width:24px;height:2px;background:#fff;margin:6px 0;transition:.3s}
.site-head.scrolled .nav-tgl span{background:var(--ink)}

/* ---------- Hero ---------- */
.hero{
  position:relative;min-height:100svh;display:flex;align-items:flex-end;
  color:#fff;isolation:isolate;
}
.hero .bg{position:absolute;inset:0;z-index:-2}
.hero .bg img{width:100%;height:100%;object-fit:cover}
.hero .bg::after{
  content:"";position:absolute;inset:0;z-index:1;
  background:linear-gradient(200deg,rgba(0,0,0,.08) 25%,rgba(0,0,0,.46) 85%);
}
.hero .wrap{position:relative;z-index:2;width:100%;padding-bottom:clamp(64px,10vh,120px)}
.hero .en{color:rgba(255,255,255,.85);margin-bottom:22px}
.hero h1{
  font-size:clamp(34px,5.8vw,72px);font-weight:600;line-height:1.28;letter-spacing:.06em;
  max-width:18em;text-shadow:0 2px 24px rgba(0,0,0,.38);
}
.hero p{margin:26px 0 40px;font-size:clamp(14px,1.6vw,17px);color:rgba(255,255,255,.88);letter-spacing:.12em;text-shadow:0 1px 14px rgba(0,0,0,.35)}
.hero .cta{display:flex;gap:18px;flex-wrap:wrap}
.hero .scroll-hint{
  position:absolute;right:var(--pad);bottom:40px;z-index:2;
  writing-mode:vertical-rl;font-size:10px;letter-spacing:.4em;color:rgba(255,255,255,.7);
}

/* ---------- 数据带 ---------- */
.stats{background:var(--ink);color:#fff}
.stats .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding-top:64px;padding-bottom:64px}
.stat b{display:block;font-size:clamp(34px,4vw,54px);font-weight:300;line-height:1.1;font-variant-numeric:tabular-nums}
.stat b i{font-style:normal;font-size:.55em;margin-left:2px}
.stat span{display:block;margin-top:8px;font-size:13px;letter-spacing:.2em;color:rgba(255,255,255,.65)}

/* ---------- 引言块 ---------- */
.lede{background:var(--paper)}
.lede .wrap{max-width:980px}
.lede blockquote{
  font-size:clamp(20px,2.6vw,30px);font-weight:300;line-height:2;letter-spacing:.06em;
}
.lede blockquote b{font-weight:600}
.lede .more{margin-top:36px;display:inline-flex;align-items:center;gap:14px;font-size:13px;letter-spacing:.3em;color:var(--mut)}
.lede .more::after{content:"";width:56px;height:1px;background:var(--mut)}

/* ---------- 业务板块 ---------- */
.biz{background:var(--grey)}
.biz-list{display:grid;grid-template-columns:repeat(5,1fr);gap:14px}
.biz-item{background:#fff;padding:30px 24px 26px;position:relative;transition:.4s;border:1px solid transparent}
.biz-item:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(0,0,0,.08)}
.biz-item i{font-style:normal;font-size:12px;color:var(--mut);letter-spacing:.2em}
.biz-item h3{font-size:19px;font-weight:600;margin:16px 0 4px;letter-spacing:.08em}
.biz-item small{font-size:10px;letter-spacing:.22em;color:var(--mut);text-transform:uppercase;display:block;line-height:1.6}
.biz-item .arr{position:absolute;right:22px;bottom:20px;font-size:16px;color:var(--mut);transition:.3s}
.biz-item:hover .arr{color:var(--ink);transform:translateX(4px)}

/* ---------- 案例网格 ---------- */
.works{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(14px,2vw,26px)}
.work{position:relative;overflow:hidden;display:block}
.work .ph{overflow:hidden;aspect-ratio:4/3;background:#e8e8e5}
.work .ph img{width:100%;height:100%;object-fit:cover;transition:transform 1s ease}
.work:hover .ph img{transform:scale(1.05)}
.work.tall .ph{aspect-ratio:3/4}
.work.wide{grid-column:span 2}
.work.wide .ph{aspect-ratio:16/8.4}
.work .cap{
  display:flex;justify-content:space-between;align-items:baseline;gap:10px;
  padding:16px 2px 0;
}
.work .cap h3{font-size:17px;font-weight:600;letter-spacing:.06em}
.work .cap span{font-size:12px;color:var(--mut);letter-spacing:.14em;white-space:nowrap}

/* ---------- 服务链 ---------- */
.chain{background:var(--ink);color:#fff}
.chain .sec-head h2{color:#fff}
.chain .en{color:rgba(255,255,255,.55)}
.chain-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.16)}
.chain-grid li{background:var(--ink);padding:40px 28px 44px}
.chain-grid i{font-style:normal;font-size:12px;letter-spacing:.3em;color:rgba(255,255,255,.5)}
.chain-grid h3{font-size:21px;font-weight:600;margin:18px 0 10px;letter-spacing:.1em}
.chain-grid p{font-size:13.5px;color:rgba(255,255,255,.66);line-height:1.9}

/* ---------- 页头 banner（内页） ---------- */
.page-hero{
  background:var(--ink);color:#fff;padding:clamp(140px,22vh,210px) 0 clamp(56px,9vh,96px);
}
.page-hero .en{color:rgba(255,255,255,.55)}
.page-hero h1{font-size:clamp(34px,5vw,60px);font-weight:600;letter-spacing:.08em;margin-top:16px;line-height:1.3}
.page-hero p{margin-top:20px;color:rgba(255,255,255,.66);font-size:15px;max-width:44em;letter-spacing:.05em}

/* ---------- 案例档案 ---------- */
.case{margin-bottom:clamp(56px,8vw,100px)}
.case .ph{overflow:hidden;max-height:640px;background:#e8e8e5}
.case .ph img{width:100%;height:100%;object-fit:cover}
.case .meta{
  display:flex;flex-wrap:wrap;gap:14px 44px;align-items:baseline;
  padding:22px 0 6px;border-bottom:1px solid var(--line);margin-top:4px;
}
.case .meta h3{font-size:clamp(21px,2.4vw,28px);font-weight:600;letter-spacing:.06em}
.case .meta .en-t{font-size:11px;letter-spacing:.2em;color:var(--mut);text-transform:uppercase}
.case .fact{display:flex;flex-wrap:wrap;gap:8px 36px;padding:14px 0 0}
.case .fact span{font-size:13px;color:var(--mut);letter-spacing:.06em}
.case .fact b{color:var(--ink);font-weight:600;margin-left:8px}
.case .desc{margin-top:16px;max-width:52em;color:#3c3c38;font-size:15px}
.case .tag-real{
  display:inline-block;margin-left:12px;padding:3px 10px;font-size:11px;letter-spacing:.2em;
  border:1px solid var(--ink);vertical-align:3px;
}
.case-grid2{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:14px}

/* ---------- 服务页 ---------- */
.svc{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,64px);align-items:center;margin-bottom:clamp(64px,9vw,110px)}
.svc .ph{overflow:hidden;aspect-ratio:4/3;background:#e8e8e5}
.svc .ph img{width:100%;height:100%;object-fit:cover}
.svc .tx i{font-style:normal;font-size:13px;color:var(--mut);letter-spacing:.3em}
.svc .tx h3{font-size:clamp(24px,3vw,36px);font-weight:600;margin:14px 0 6px;letter-spacing:.08em}
.svc .tx small{display:block;font-size:11px;letter-spacing:.24em;color:var(--mut);text-transform:uppercase;margin-bottom:18px}
.svc .tx p{color:#3c3c38;font-size:15px}
.svc.rev .ph{order:2}
.fields{display:flex;flex-wrap:wrap;gap:12px}
.fields li{
  border:1px solid var(--line);padding:14px 26px;font-size:14px;letter-spacing:.14em;
}

/* ---------- 关于页 ---------- */
.quote-big{max-width:940px}
.quote-big p{font-size:clamp(19px,2.3vw,27px);font-weight:300;line-height:2.1;letter-spacing:.05em}
.quote-big p b{font-weight:600}
.model{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:14px}
.model div{background:var(--grey);padding:34px 28px}
.model b{font-size:22px;font-weight:600;letter-spacing:.1em;display:block}
.model span{display:block;margin-top:8px;font-size:11px;letter-spacing:.24em;color:var(--mut);text-transform:uppercase}
.model p{margin-top:14px;font-size:13.5px;color:#55554f}
.honors li{
  display:flex;justify-content:space-between;gap:20px;padding:20px 4px;
  border-bottom:1px solid var(--line);font-size:15px;letter-spacing:.05em;
}
.honors li span{color:var(--mut);font-size:13px;white-space:nowrap}

/* ---------- 联系页 ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,80px)}
.c-item{padding:26px 0;border-bottom:1px solid var(--line)}
.c-item .en{display:block;margin-bottom:8px}
.c-item b{font-size:clamp(17px,1.8vw,21px);font-weight:600;letter-spacing:.05em;line-height:1.7}
.c-item p{color:var(--mut);font-size:13.5px;margin-top:6px}
.note-card{background:var(--grey);padding:38px 34px}
.note-card h3{font-size:19px;font-weight:600;letter-spacing:.08em;margin-bottom:14px}
.note-card p{font-size:14px;color:#55554f;margin-bottom:12px}

/* ---------- CTA 带 ---------- */
.cta-band{background:var(--grey);text-align:center}
.cta-band h2{font-size:clamp(26px,3.6vw,44px);font-weight:600;letter-spacing:.08em;margin:14px 0 30px}

/* ---------- 页脚 ---------- */
.foot{background:var(--ink);color:rgba(255,255,255,.72);padding:72px 0 36px;font-size:13px}
.foot .top{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;padding-bottom:44px;border-bottom:1px solid rgba(255,255,255,.14)}
.foot .brand{color:#fff}
.foot .cols{display:flex;gap:clamp(30px,6vw,90px);flex-wrap:wrap}
.foot h4{color:#fff;font-size:13px;letter-spacing:.24em;margin-bottom:16px;font-weight:600}
.foot li{margin:7px 0}
.foot a:hover{color:#fff}
.foot .base{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding-top:26px;color:rgba(255,255,255,.45);font-size:12px;letter-spacing:.06em}

/* ---------- 相关证书 ---------- */
.cred-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.cred{
  background:#fff;padding:34px 30px 30px;border:1px solid var(--line);
  position:relative;transition:.4s;
}
.cred:hover{transform:translateY(-4px);box-shadow:0 16px 36px rgba(0,0,0,.07)}
.cred i{font-style:normal;font-size:11px;letter-spacing:.3em;color:var(--mut)}
.cred b{display:block;font-size:20px;font-weight:600;letter-spacing:.06em;margin:14px 0 8px;line-height:1.5}
.cred .no{font-size:13px;color:#55554f;letter-spacing:.04em;line-height:1.9}
.cred .no code{font-family:ui-monospace,Consolas,monospace;font-size:12.5px;background:var(--grey);padding:2px 8px}
.cred .vld{display:inline-block;margin-top:12px;font-size:11px;letter-spacing:.16em;color:var(--mut)}
.cred.full{grid-column:1 / -1}
.patents{display:grid;grid-template-columns:repeat(2,1fr);gap:0 48px;margin-top:8px}
.patents li{
  display:flex;justify-content:space-between;gap:16px;padding:14px 2px;
  border-bottom:1px solid var(--line);font-size:14px;letter-spacing:.03em;
}
.patents li code{font-family:ui-monospace,Consolas,monospace;font-size:12px;color:var(--mut);white-space:nowrap}
.trust{
  display:flex;flex-wrap:wrap;gap:10px 0;justify-content:center;
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  padding:26px 0;margin-top:10px;
}
.trust li{font-size:13px;letter-spacing:.08em;color:#3c3c38;padding:0 22px;border-right:1px solid var(--line)}
.trust li:last-child{border-right:0}

/* ---------- 项目版图清单 ---------- */
.roster{border-top:1px solid var(--ink);margin-top:12px}
.roster li{
  display:grid;grid-template-columns:64px 1fr auto auto;gap:10px 28px;align-items:baseline;
  padding:16px 2px;border-bottom:1px solid var(--line);font-size:15px;
}
.roster li i{font-style:normal;font-size:12px;color:var(--mut);letter-spacing:.1em}
.roster li b{font-weight:600;letter-spacing:.05em}
.roster li span{font-size:12.5px;color:var(--mut);letter-spacing:.08em;white-space:nowrap}
.roster li em{font-style:normal;font-size:12px;color:var(--mut);letter-spacing:.1em;white-space:nowrap}
.roster-group{margin:44px 0 10px;font-size:13px;letter-spacing:.3em;color:var(--mut);text-transform:uppercase}

/* ---------- 响应式 ---------- */
@media (max-width:1000px){
  .works{grid-template-columns:repeat(2,1fr)}
  .work.wide{grid-column:span 2}
  .biz-list{grid-template-columns:repeat(2,1fr)}
  .chain-grid{grid-template-columns:repeat(2,1fr)}
  .svc,.contact-grid{grid-template-columns:1fr}
  .svc.rev .ph{order:0}
  .stats .wrap{grid-template-columns:repeat(2,1fr)}
  .model{grid-template-columns:1fr}
  .cred-grid{grid-template-columns:1fr}
  .patents{grid-template-columns:1fr}
  .trust li{padding:6px 18px}
  .roster li{grid-template-columns:44px 1fr auto}
  .roster li em{display:none}
}
@media (max-width:680px){
  .site-head nav{
    position:fixed;inset:76px 0 auto 0;background:#fff;flex-direction:column;gap:0;
    padding:10px var(--pad) 26px;box-shadow:0 20px 40px rgba(0,0,0,.1);
    transform:translateY(-130%);transition:transform .4s;
  }
  .site-head nav a{color:var(--ink)!important;padding:13px 0;border-bottom:1px solid var(--line);font-size:15px}
  body.nav-open .site-head nav{transform:none}
  body.nav-open .site-head{background:#fff}
  body.nav-open .brand,body.nav-open .nav-tgl span{color:var(--ink)}
  body.nav-open .nav-tgl span{background:var(--ink)!important}
  body.nav-open .brand .logo-w{display:none}
  body.nav-open .brand .logo-d{display:block}
  .nav-tgl{display:block}
  .works{grid-template-columns:1fr}
  .work.wide{grid-column:span 1}
  .biz-list{grid-template-columns:1fr}
  .chain-grid{grid-template-columns:1fr}
  .stats .wrap{grid-template-columns:1fr 1fr;gap:34px 16px}
  .case-grid2{grid-template-columns:1fr}
  .hero h1{font-size:clamp(30px,8.4vw,40px)}
}