/* ============================================================
   聚境设计 studio gammarc — 全站样式
   ============================================================ */
:root{
  --paper:#f0f1f3;
  --paper-2:#e7e9ec;
  --ink:#1d2088;
  --ink-2:#3f4490;
  --muted:#4b51a3;
  --line:#d9d9e8;
  --accent:#1d2088;
  --ph:#dfe3e8;
  --serif:"Songti SC","Noto Serif SC","Source Han Serif SC","SimSun",serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --max:1120px;
  --narrow:760px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--paper);color:var(--ink);
  font-family:var(--sans);
  font-size:16px;line-height:1.75;letter-spacing:.01em;
  -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}
.narrow{max-width:var(--narrow);margin:0 auto;padding:0 28px}
@media(max-width:640px){.wrap,.narrow{padding:0 20px}}

/* ---------- 顶部 ---------- */
header{
  position:sticky;top:0;z-index:50;
  background:rgba(240,241,243,.92);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .3s;
}
header.solid{}
.hbar{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:block;line-height:1.2}
.brand .b1{display:flex;align-items:baseline;gap:8px}
.brand b{font-family:var(--serif);font-weight:600;font-size:17px;letter-spacing:.08em}
.brand .b-en{font-size:10.5px;color:var(--muted);letter-spacing:.22em}
.brand .b-tag{
  display:block;margin-top:3px;
  font-size:9px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--muted);opacity:.9;
}
nav{display:flex;gap:27px;align-items:baseline}
nav a{font-size:12.5px;color:var(--ink-2);letter-spacing:.08em;position:relative;padding-bottom:2px}
nav a::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:0;
  background:var(--accent);transition:width .3s;
}
nav a:hover{color:var(--accent)}
nav a:hover::after,nav a.on::after{width:100%}
nav a.on{color:var(--accent)}
@media(max-width:760px){nav{gap:18px}nav a{font-size:12px}}
@media(max-width:640px){.brand .b-tag{display:none}}

/* 返回链接 */
.back{
  display:inline-flex;align-items:center;gap:7px;
  font-size:12px;color:var(--muted);letter-spacing:.1em;
  transition:color .25s;
}
.back:hover{color:var(--accent)}
.back i{font-style:normal;font-size:14px;line-height:1}

/* ---------- 首屏 ---------- */
.hero{padding:88px 0 0}
.kicker{
  font-size:11.5px;letter-spacing:.28em;color:var(--muted);
  text-transform:uppercase;margin-bottom:26px;
}
.hero h1,.page-h1{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(38px,6.6vw,72px);
  line-height:1.18;letter-spacing:.02em;
}
.hero h1 em,.page-h1 em{font-style:normal;color:var(--accent)}
.lede{
  margin-top:26px;max-width:33em;
  font-family:var(--serif);font-size:clamp(16px,2.2vw,20px);
  line-height:1.9;color:var(--ink-2);
}
.en{
  margin-top:14px;font-size:12.5px;line-height:1.9;color:var(--muted);
  letter-spacing:.04em;max-width:46em;
}
.hero-meta{
  display:flex;flex-wrap:wrap;gap:8px 26px;
  margin-top:38px;
  font-size:12px;letter-spacing:.1em;color:var(--muted);
}

/* ---------- 图片占位 / 图片 ---------- */
.ph{
  position:relative;background:var(--ph);
  display:flex;align-items:center;justify-content:center;
  overflow:hidden;
}
.ph::after{
  content:attr(data-label);
  font-size:11px;letter-spacing:.16em;color:var(--muted);
  text-align:center;padding:0 14px;line-height:1.7;max-width:88%;
}
.ph.r16-9{aspect-ratio:16/9}
.ph.r3-2{aspect-ratio:3/2}
.ph.r4-3{aspect-ratio:4/3}
.ph.r1-1{aspect-ratio:1/1}
.ph.r4-5{aspect-ratio:4/5}
.ph.r3-4{aspect-ratio:3/4}
.ph.r2-1{aspect-ratio:2/1}

.shot{position:relative;overflow:hidden;background:var(--ph)}
.shot img{width:100%;height:auto;display:block;transition:transform .7s cubic-bezier(.2,.7,.3,1)}
.shot.crop{aspect-ratio:3/2}
.shot.crop img{height:100%;object-fit:cover}
.shot.r16-9{aspect-ratio:16/9}
.shot.r16-9 img{height:100%;object-fit:cover}
a.shot:hover img{transform:scale(1.02)}

.hero-img{margin-top:54px}

/* ---------- 通用区块 ---------- */
section{padding:96px 0 0}
#cv>.wrap::before,#collab>.wrap::before{
  content:"";display:block;width:100%;height:1px;
  background:var(--line);margin:0 0 96px;
}
@media(max-width:640px){section{padding:62px 0 0}}
.sec-head{
  display:flex;align-items:baseline;gap:18px;
  margin-bottom:44px;
}
.sec-num{
  font-family:var(--serif);font-size:12px;color:var(--accent);
  letter-spacing:.2em;flex:none;padding-top:2px;
}
.sec-head h2{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(22px,3.4vw,30px);letter-spacing:.06em;
}
.sec-head .note{
  margin-left:auto;font-size:12px;color:var(--muted);letter-spacing:.1em;text-align:right;
}
.sec-head.tight{gap:14px}
.sec-head.tight .note{margin-left:0;text-align:left}
@media(max-width:640px){.sec-head .note{display:none}}

.statement{
  font-family:var(--serif);
  font-size:clamp(19px,2.8vw,26px);line-height:1.85;
  max-width:26em;margin-bottom:36px;letter-spacing:.02em;
}
.statement small{
  display:block;margin-top:18px;font-family:var(--sans);
  font-size:14px;line-height:2;color:var(--ink-2);max-width:34em;letter-spacing:.02em;
}

/* ---------- 卡片网格 ---------- */
.grid{display:grid;gap:38px 26px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
@media(max-width:900px){.g3{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.g3,.g2{grid-template-columns:1fr;gap:32px}}

.card{display:block}
.card .cap{margin-top:13px}
.card .cap h4{
  font-family:var(--serif);font-weight:600;
  font-size:15.5px;letter-spacing:.04em;line-height:1.55;
}
.card .cap p{font-size:12px;color:var(--muted);letter-spacing:.06em;margin-top:4px}
.card .cap .kw{margin-top:7px;font-size:11.5px;color:var(--accent);letter-spacing:.1em}
.card .cap .lead{
  font-family:var(--serif);font-weight:600;font-size:15.5px;line-height:1.6;letter-spacing:.03em;
}
.card .ph{transition:opacity .35s}
.card:hover .ph{opacity:.88}
.card:hover h4{color:var(--accent)}
.card h4{transition:color .25s}

/* ---------- 首页精选：横向滑动 ---------- */
.feat-rail{
  overflow-x:auto;overflow-y:hidden;
  scroll-snap-type:x mandatory;
  scroll-padding-inline:max(28px,calc((100vw - var(--max))/2 + 28px));
  -webkit-overflow-scrolling:touch;
  scrollbar-width:none;
}
.feat-rail::-webkit-scrollbar{display:none}
.feat-track{
  display:flex;gap:24px;
  padding-inline:max(28px,calc((100vw - var(--max))/2 + 28px));
}
.feat-slide{
  display:block;flex:0 0 min(calc(100vw - 56px),calc(var(--max) - 56px));
  scroll-snap-align:start;
}
.feat-slide .shot,.feat-slide .ph{aspect-ratio:3/2;overflow:hidden;background:var(--ph)}
.feat-slide .shot img{width:100%;height:100%;object-fit:cover;transition:transform .8s cubic-bezier(.2,.7,.3,1)}
.feat-slide:hover .shot img{transform:scale(1.015)}

/* 图注：悬浮在图片左下角，名称+小 meta */
.feat-slide{position:relative}
.feat-slide .feat-cap{
  position:absolute;left:14px;bottom:14px;z-index:2;
  display:flex;align-items:baseline;gap:10px;
  background:rgba(255,255,255,.93);
  padding:8px 14px;
}
.feat-slide .feat-cap h3{font-family:var(--serif);font-weight:500;font-size:14px;letter-spacing:.04em;color:var(--ink);margin:0}
.feat-slide .feat-cap .feat-meta{font-size:11px;letter-spacing:.08em;color:var(--muted);white-space:nowrap}
.feat-slide:hover h3{color:var(--ink)}

/* 滑动区容器 + 贴图底进度线 */
.feat-wrap{position:relative}
.rail-line{position:absolute;left:0;right:0;bottom:0;height:2px;background:transparent;pointer-events:none;z-index:3}
.rail-line i{display:block;height:2px;background:var(--ink);transition:transform .35s cubic-bezier(.2,.7,.3,1)}

/* 悬停淡入的左右箭头（触屏隐藏） */
.rail-btn{
  position:absolute;top:50%;transform:translateY(-50%);z-index:4;
  width:38px;height:38px;line-height:1;border-radius:50%;
  background:rgba(255,255,255,.9);border:0.5px solid var(--line);
  color:var(--ink-2);font-size:15px;cursor:pointer;
  opacity:0;transition:opacity .25s,transform .25s;
}
.rail-btn.prev{left:16px}
.rail-btn.next{right:16px}
.feat-wrap:hover .rail-btn{opacity:1}
.rail-btn:hover{color:var(--accent);border-color:var(--accent)}
@media(hover:none){
  .rail-btn{display:none}
}
.feat-rail{cursor:grab}
.feat-rail:active{cursor:grabbing}

@media(max-width:640px){
  .feat-slide{flex-basis:calc(100vw - 88px)}
  .feat-track{gap:16px;padding-inline:20px}
  .feat-rail{scroll-padding-inline:20px}
  .feat-cap{left:10px;bottom:10px;padding:6px 10px}
  .feat-cap h3{font-size:13px}
  .feat-cap .feat-meta{font-size:10.5px}
}

/* ---------- 首页精选（旧纵向版，保留备用） ---------- */
.feat{display:block;margin-bottom:78px}
.feat .ph,.feat .shot{margin-bottom:16px}
.feat-cap{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap}
.feat-n{
  font-family:var(--serif);font-size:11.5px;color:var(--accent);
  letter-spacing:.16em;flex:none;
}
.feat-cap h3{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(19px,2.6vw,25px);letter-spacing:.05em;line-height:1.4;
  transition:color .25s;
}
.feat:hover h3{color:var(--accent)}
.feat-meta{font-size:12px;color:var(--muted);letter-spacing:.1em;margin-left:auto}
@media(max-width:640px){.feat-meta{margin-left:0;flex:1 1 100%;margin-top:2px}}
.feat-lead{
  font-family:var(--serif);font-size:15px;line-height:1.8;
  color:var(--ink-2);margin-top:6px;max-width:32em;letter-spacing:.02em;
}
.more-row{margin-top:8px}
.more{
  display:inline-block;font-size:13px;letter-spacing:.14em;
  color:var(--accent);border-bottom:1px solid var(--line);
  padding-bottom:3px;transition:border-color .25s;
}
.more:hover{border-color:var(--accent)}

/* ---------- 二维码 ---------- */
.qr{margin-top:22px}
.qr i{display:block;font-style:normal;font-size:10.5px;letter-spacing:.2em;color:var(--muted);margin-bottom:5px}
.qr img{width:150px;border:1px solid var(--line);border-radius:3px}

/* ---------- 分类小标题 ---------- */
.cat{margin-bottom:64px}
.cat-h{display:flex;align-items:baseline;gap:12px;margin-bottom:24px}
.cat-h b{font-family:var(--serif);font-weight:600;font-size:16px;letter-spacing:.14em}
.cat-h span{font-size:11.5px;color:var(--muted);letter-spacing:.14em}
.cat-h i{flex:1;height:1px;background:var(--line);display:block;margin-bottom:5px}

/* ---------- 筛选 ---------- */
.filters-bar{
  position:sticky;top:64px;z-index:40;
  background:rgba(240,241,243,.92);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
}
.filters{
  display:flex;flex-wrap:wrap;gap:10px;
  padding-block:16px;margin-bottom:0;
}
.filters-bar + section{padding-top:40px}
.filters button{
  font-family:var(--sans);font-size:12.5px;letter-spacing:.1em;
  color:var(--ink-2);background:none;border:1px solid var(--line);
  padding:7px 16px;border-radius:2px;cursor:pointer;
  transition:all .22s;
}
.filters button:hover{border-color:var(--accent);color:var(--accent)}
.filters button.on{background:var(--ink);border-color:var(--ink);color:var(--paper)}

/* ---------- 荣誉 ---------- */
/* ---------- 履历时间线 ---------- */
.cv{list-style:none}
.cv li{
  display:flex;gap:20px;padding:17px 0;
  align-items:baseline;
}
.cv .y{
  flex:none;width:5.4em;font-size:12px;color:var(--muted);
  letter-spacing:.08em;font-variant-numeric:tabular-nums;
}
.cv .t img{display:block;width:min(320px,60%);height:auto;object-fit:contain;margin-top:12px}
.cv .t img.v{width:min(214px,44%)}
.cv .t img.sm{width:min(190px,36%);margin-top:10px}
.noimg{display:none}
.cv .t{flex:1;font-size:13.5px;color:var(--ink-2);line-height:1.6}
.cv .t b{font-weight:600;color:var(--ink)}
.cv .t em{font-style:normal;font-size:12px;color:var(--accent);letter-spacing:.06em;margin-left:10px}
.cv .t .tag{font-size:11px;color:var(--muted);letter-spacing:.06em;margin-left:10px;white-space:nowrap;opacity:.9}
.cv .t .tag::before{content:"· ";opacity:.6}
.cv .t span.d{display:block;margin-top:3px;font-size:12.5px;color:var(--muted)}
.cv .t a{font-size:12px;color:var(--muted);margin-left:10px;text-decoration:none}
.cv .t a.media{color:var(--accent)}
.cv .t a.media:hover{text-decoration:underline;text-underline-offset:3px}
.cv .t a:hover{color:var(--accent);border-color:var(--accent)}
/* 公司条目下的子项目：缩进、小一号 */
.cv .sub{list-style:none;margin:12px 0 0;padding:0}
.cv .sub li{display:flex;gap:12px;padding:5px 0;align-items:baseline}
.cv .sub .y{
  flex:none;width:4.6em;font-size:11.5px;color:var(--muted);
  letter-spacing:.08em;font-variant-numeric:tabular-nums;
}
.cv .sub .t{flex:1;font-size:12.5px;line-height:1.55;color:var(--ink-2)}
.cv .sub .t em{font-size:11.5px;margin-left:8px}
.cv .sub .t a{font-size:11.5px;margin-left:8px}
.cv .sub .t img{width:min(260px,52%);margin-top:8px}
.cv .sub .t img.v{width:min(174px,38%)}
@media(max-width:640px){
  .cv li{gap:14px}
  .cv .t img{width:min(240px,72%)}
}

/* ---------- 协作名录 ---------- */
.collab-lead,.cv-lead{font-size:13px;color:var(--muted);margin-bottom:28px;max-width:34em}

.cl{padding:24px 0}
.cl-h{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap}
.cl-h b{font-family:var(--serif);font-weight:600;font-size:16px;letter-spacing:.06em}
.cl-h .kind{font-size:11px;color:var(--muted);letter-spacing:.12em}
.cl .div{font-size:13.5px;color:var(--ink-2);margin-top:7px}
.cl .note{display:block;font-size:12px;color:var(--muted);margin-top:5px;line-height:1.8}
.cl .cl-p{margin-top:10px;font-size:12.5px}
.cl .cl-p a{color:var(--accent);text-decoration:none;margin-right:16px;border-bottom:1px solid transparent}
.cl .cl-p a:hover{border-color:var(--accent)}
.cl .more{font-size:12px;color:var(--muted)}

/* ---------- 主持建筑师一行 ---------- */
/* 主持建筑师（People 式） */
.host{margin-top:0;max-width:34em;font-size:14px}
.host-photo{display:block;width:132px;height:auto;margin-bottom:18px}
.host-body h3{font-family:var(--serif);font-weight:600;font-size:19px;letter-spacing:.08em;color:var(--ink)}
.host-body h3 span{font-size:13px;color:var(--muted);letter-spacing:.14em;margin-left:8px;font-family:var(--sans)}
.host-cred{font-size:12px;color:var(--accent);letter-spacing:.08em;margin-top:6px}
.host-bio{font-size:14px;line-height:2;color:var(--ink-2);margin-top:14px;letter-spacing:.02em}
@media(max-width:640px){.host-photo{width:112px}}

.method{display:block;max-width:780px;margin-top:42px}
.method div{display:flex;gap:30px;align-items:baseline;padding:13px 0}
.method b{
  flex:none;width:6.4em;
  font-family:var(--serif);font-weight:600;font-size:15px;letter-spacing:.1em;
  color:var(--ink);margin:0;
}
.method span{flex:1;font-size:13.5px;line-height:1.85;color:var(--muted)}
@media(max-width:760px){
  .method div{display:block;padding:12px 0}
  .method b{display:block;margin-bottom:6px}
}

/* ---------- 项目页 ---------- */
.proj-head{padding-top:56px}
.proj-head .kicker{margin-bottom:20px}
.proj-head .head-sub{
  font-size:11.5px;letter-spacing:.28em;text-transform:uppercase;
  color:var(--muted);margin-top:18px;
}
.proj-head h1{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(30px,5vw,52px);line-height:1.22;letter-spacing:.03em;
}
.proj-head h1 .h1-en{
  font-family:var(--sans);font-weight:400;
  font-size:12px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--muted);margin-left:16px;white-space:nowrap;
}
.proj-head .sub{
  font-size:13px;color:var(--muted);letter-spacing:.12em;margin-top:12px;
}
.proj-lead{
  font-family:var(--serif);font-size:clamp(18px,2.6vw,24px);
  line-height:1.8;color:var(--ink);max-width:24em;
  margin-top:32px;
  letter-spacing:.02em;
}
.proj-cover{margin-top:44px}
.proj-cover .shot img{max-height:72vh;width:100%;object-fit:cover;object-position:center}

/* 元信息表 */
.meta{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(168px,1fr));
  gap:1px;background:var(--line);
  margin-top:52px;
}
.meta div{background:var(--paper);padding:16px 18px}
.meta i{
  display:block;font-style:normal;font-size:10.5px;letter-spacing:.2em;
  color:var(--muted);margin-bottom:6px;
}
.meta b{font-weight:400;font-size:13.5px;color:var(--ink);line-height:1.6}

/* 正文：单列 34em，与工作室页一致 */
.proj-body{padding-top:64px}
.proj-body p{
  font-size:14px;line-height:2;color:var(--ink-2);
  letter-spacing:.02em;
  margin-bottom:18px;max-width:34em;
}
.proj-body p:last-child{margin-bottom:0}

/* 三段结构 */
.chapters{margin-top:64px}
.chap{
  display:grid;grid-template-columns:120px 1fr;gap:28px;
  padding:26px 0;
}
@media(max-width:640px){.chap{grid-template-columns:1fr;gap:8px;padding:22px 0}}
.chap b{
  font-family:var(--serif);font-weight:600;font-size:13px;
  color:var(--accent);letter-spacing:.18em;padding-top:3px;
}
.chap span{font-size:14px;line-height:2;color:var(--ink-2);max-width:34em;letter-spacing:.02em}
.chap span.pending{color:var(--muted);font-size:13.5px}

/* 图集：两列瀑布流，不裁切 */
.gallery-sec{padding-top:80px}
.gal{column-count:2;column-gap:14px}
@media(max-width:640px){.gal{column-count:1;column-gap:0}}
.gal .ph,.gal .shot{break-inside:avoid;margin-bottom:14px;cursor:zoom-in}
.gal .ph.r4-3{aspect-ratio:4/3}

/* 上下项目 */
.pager{
  margin-top:96px;
  display:grid;grid-template-columns:1fr 1fr;gap:24px;
}
.pager a{display:block;transition:opacity .25s}
.pager a:hover{opacity:.6}
.pager a.next{text-align:right}
.pager i{
  display:block;font-style:normal;font-size:10.5px;letter-spacing:.2em;
  color:var(--muted);margin-bottom:7px;
}
.pager b{
  font-family:var(--serif);font-weight:600;font-size:17px;letter-spacing:.04em;
  line-height:1.5;
}
.pager .empty{visibility:hidden}

/* ---------- 联系 ---------- */
.contact{margin-top:0;padding-top:64px}
.contact-motto{padding-top:104px;padding-bottom:72px}
.contact-motto .statement{margin-bottom:80px}
.contact-cta{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(24px,3.4vw,34px);line-height:1.5;letter-spacing:.04em;
  color:var(--ink);margin:0 0 30px;
}
.contact-motto .proj-lead{margin-top:0}

.contact h2{
  font-family:var(--serif);font-weight:600;
  font-size:clamp(26px,4.4vw,40px);line-height:1.4;letter-spacing:.04em;
  margin-bottom:34px;
}
.contact .rows{display:flex;flex-wrap:wrap;gap:16px 60px}
.rows-col{flex-direction:column;align-items:flex-start;gap:22px}
.contact .row{font-size:14px;color:var(--ink-2)}
.contact .row i{
  display:block;font-style:normal;font-size:10.5px;letter-spacing:.2em;
  color:var(--muted);margin-bottom:5px;
}
.contact .row a{text-decoration:underline;text-decoration-color:transparent;text-underline-offset:4px;transition:color .25s}
.contact .row a:hover{border-color:var(--accent);color:var(--accent)}

footer{
  max-width:var(--max);margin:64px auto 0;padding:26px 28px 40px;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
  font-size:11.5px;color:var(--muted);letter-spacing:.1em;
}
@media(max-width:640px){footer{margin-top:56px;padding:22px 20px 34px}}

.todo{border-bottom:1px dashed var(--accent);color:var(--accent)}

/* ---------- Lightbox ---------- */
.lb{
  position:fixed;inset:0;z-index:200;
  background:rgba(24,22,18,.94);
  display:none;align-items:center;justify-content:center;
  padding:5vh 5vw;
}
.lb.open{display:flex}
.lb img{max-width:100%;max-height:90vh;object-fit:contain}
.lb .lb-ph{
  color:var(--muted);font-size:13px;letter-spacing:.16em;text-align:center;
  border:1px dashed #5a544a;padding:80px 60px;max-width:520px;line-height:2;
}
.lb .close{
  position:absolute;top:22px;right:26px;
  color:#e7e9f5;font-size:26px;line-height:1;cursor:pointer;
  background:none;border:none;font-family:var(--sans);
}
.lb .nav{
  position:absolute;top:50%;transform:translateY(-50%);
  color:#e7e9f5;font-size:30px;cursor:pointer;background:none;border:none;
  padding:20px;line-height:1;
}
.lb .nav.prev{left:1%}
.lb .nav.next{right:1%}
.lb .nav:hover,.lb .close:hover{color:#fff}
.lb .cap{
  position:absolute;bottom:20px;left:0;right:0;text-align:center;
  color:var(--muted);font-size:11.5px;letter-spacing:.14em;
}

/* ---------- 工作室页内导航（同作品页筛选样式） ---------- */
.subnav{
  display:block;position:sticky;top:64px;z-index:40;
  background:rgba(240,241,243,.92);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
}
.subnav .wrap{display:flex;gap:10px;padding-block:16px}
.subnav a{
  font-size:12.5px;letter-spacing:.1em;line-height:1;
  color:var(--ink-2);background:none;border:1px solid var(--line);
  padding:8px 16px;border-radius:2px;text-decoration:none;
  transition:all .22s;
}
.subnav a::after{content:none}
.subnav a::after{content:none}
.subnav a:hover{border-color:var(--accent);color:var(--accent)}
.subnav a.on{background:var(--ink);border-color:var(--ink);color:var(--paper)}
@media(max-width:640px){
  .subnav{top:64px}
  .subnav .wrap{gap:8px;padding-block:14px}
  .subnav a{padding:7px 13px;font-size:12px}
}
.collab-motto{
  font-family:var(--serif);font-size:clamp(18px,2.4vw,23px);
  letter-spacing:.04em;margin-bottom:14px;
}
.collab-motto + .collab-lead{margin-top:0}

.method-text{
  font-family:var(--sans);font-size:14px;line-height:2;
  color:var(--ink-2);max-width:34em;margin:0 0 104px;
}


/* ---------- 首页封面：通栏出血拼贴（上/左/右贴边，文字浮于图上） ---------- */
.home-cover{position:relative}
.cover-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr;
  grid-template-rows:30vh 30vh;
  width:100%;
}
.cv-item{display:block;overflow:hidden;background:var(--ph)}
.cv-item img{
  width:100%;height:100%;object-fit:cover;display:block;
  transition:transform .8s cubic-bezier(.2,.7,.3,1);
}
.cv-item:hover img{transform:scale(1.02)}
.cv-1{grid-row:1 / span 2}
.cover-text{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:110px clamp(20px,4vw,48px) 38px;
  background:linear-gradient(180deg,rgba(18,19,40,0) 0%,rgba(18,19,40,.55) 80%);
  color:#fff;
}
.cover-text .lede{color:#fff;margin:0 0 10px}
.cover-text .en{color:rgba(255,255,255,.78);margin:0}
@media(max-width:720px){
  .cover-grid{grid-template-columns:1fr 1fr;grid-template-rows:46vh 25vh}
  .cv-1{grid-column:1 / span 2;grid-row:auto}
  .cv-2,.cv-3{grid-row:2}
  .cover-text{
    position:static;background:none;color:var(--ink);
    padding:24px 20px 10px;
  }
  .cover-text .lede{color:var(--ink)}
  .cover-text .en{color:var(--muted)}
}