/* ============================================================
   北京横渠四句科技有限公司 · Corporate Site
   Design tokens & shared components
   ============================================================ */

:root{
  --ink:#0A1A2A;
  --ink-2:#0F2437;
  --ink-3:#16304A;
  --blue:#2E7CBE;
  --blue-l:#5F9FD0;
  --blue-pale:#DCE9F4;
  --paper:#F7F5F0;
  --paper-2:#EFEAE1;
  --gold:#A3835B;
  --text:#1A2836;
  --muted:#5B6B7A;
  --line:rgba(10,26,42,.13);
  --line-soft:rgba(10,26,42,.07);
  --line-light:rgba(255,255,255,.16);

  --serif:"Songti SC","STSong","Noto Serif SC","Source Han Serif SC","SimSun",serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --mono:"SF Mono",ui-monospace,"Menlo","Consolas",monospace;

  --w:1240px;
  --gut:clamp(20px,4vw,56px);
  --ease:cubic-bezier(.22,.8,.24,1);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%; scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--text);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%; display:block}
a{color:inherit; text-decoration:none}
button{font:inherit; cursor:pointer}
::selection{background:var(--blue); color:#fff}

/* ---------- layout ---------- */
.wrap{width:100%; max-width:var(--w); margin:0 auto; padding:0 var(--gut)}
.sec{padding:clamp(64px,9vw,132px) 0; position:relative}
.sec--tight{padding:clamp(48px,6vw,88px) 0}
.sec--paper2{background:var(--paper-2)}
.sec--ink{background:var(--ink); color:#E8EEF4}
.sec--line{border-top:1px solid var(--line)}

/* ---------- typography ---------- */
h1,h2,h3,h4{margin:0; font-weight:400; letter-spacing:.01em}
.h-display{
  font-family:var(--serif);
  font-size:clamp(2.15rem,5vw,4.1rem);
  line-height:1.24;
  letter-spacing:.02em;
}
.h2{
  font-family:var(--serif);
  font-size:clamp(1.7rem,3vw,2.7rem);
  line-height:1.36;
}
.h3{
  font-family:var(--serif);
  font-size:clamp(1.22rem,1.7vw,1.55rem);
  line-height:1.5;
}
.lead{font-size:clamp(1rem,1.25vw,1.18rem); line-height:1.95; color:var(--muted); max-width:64ch}
.sec--ink .lead{color:rgba(232,238,244,.72)}
p{margin:0 0 1.1em}
p:last-child{margin-bottom:0}

/* ---------- 双栏布局工具（列宽走类名，便于移动端折叠） ---------- */
.duo{display:grid; align-items:start}
.duo--12{grid-template-columns:1fr 1.2fr}
.duo--111{grid-template-columns:1fr 1.1fr}
.duo--1105{grid-template-columns:1fr 1.05fr}
.duo--1115{grid-template-columns:1fr 1.15fr}
.duo--2115{grid-template-columns:1.15fr 1fr}
.duo--side{grid-template-columns:minmax(220px,320px) 1fr}
.duo--end{align-items:end}

.kicker{
  display:flex; align-items:center; gap:14px;
  font-family:var(--mono);
  font-size:11.5px; letter-spacing:.22em; text-transform:uppercase;
  color:var(--gold);
  margin-bottom:22px;
}
.kicker::before{content:""; width:34px; height:1px; background:currentColor; opacity:.7}
.sec--ink .kicker{color:var(--blue-l)}
.idx{font-family:var(--mono); font-size:12px; letter-spacing:.14em; color:var(--gold); opacity:.9}

/* ---------- header ---------- */
.hd{
  position:fixed; inset:0 0 auto 0; z-index:120;
  height:88px; display:flex; align-items:center;
  color:#fff;
  transition:background .45s var(--ease), color .45s var(--ease), height .45s var(--ease), box-shadow .45s var(--ease);
}
.hd::after{
  content:""; position:absolute; inset:auto 0 0 0; height:1px;
  background:currentColor; opacity:0; transition:opacity .45s var(--ease);
}
.hd.on{
  height:72px;
  background:rgba(247,245,240,.92);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  backdrop-filter:saturate(180%) blur(14px);
  color:var(--ink);
}
.hd.on::after{opacity:.12}
.hd__in{width:100%; max-width:var(--w); margin:0 auto; padding:0 var(--gut); display:flex; align-items:center; gap:clamp(20px,4vw,64px)}
.brand{display:flex; align-items:center; gap:13px; flex:none}
.brand img{width:38px; height:38px; flex:none}
.hd.on .brand img{filter:none}
.brand-txt{display:flex; flex-direction:column; line-height:1.15}
.brand-txt b{font-family:var(--serif); font-size:16.5px; font-weight:400; letter-spacing:.16em}
.brand-txt span{font-family:var(--mono); font-size:8.5px; letter-spacing:.16em; opacity:.55; margin-top:4px; text-transform:uppercase}
.nav{display:flex; align-items:center; gap:clamp(14px,2.2vw,34px); margin-left:auto}
.nav a{
  position:relative; font-size:14px; letter-spacing:.06em; padding:6px 0; opacity:.86;
  transition:opacity .3s var(--ease);
}
.nav a::after{
  content:""; position:absolute; left:0; right:0; bottom:0; height:1px; background:currentColor;
  transform:scaleX(0); transform-origin:left; transition:transform .4s var(--ease);
}
.nav a:hover{opacity:1}
.nav a:hover::after,.nav a.cur::after{transform:scaleX(1)}
.nav a.cur{opacity:1}
.hd__cta{
  display:inline-flex; align-items:center; gap:9px; flex:none;
  border:1px solid currentColor; border-radius:0;
  padding:11px 20px; font-size:13px; letter-spacing:.08em;
  transition:background .35s var(--ease), color .35s var(--ease), border-color .35s var(--ease);
}
.hd__cta:hover{background:var(--blue); border-color:var(--blue); color:#fff}
.burger{display:none; width:44px; height:44px; margin-left:auto; background:none; border:0; position:relative; flex:none}
.burger span{display:block; width:22px; height:1px; background:currentColor; margin:6px auto; transition:transform .4s var(--ease), opacity .3s}
body.menu-open .burger span:nth-child(1){transform:translateY(7px) rotate(45deg)}
body.menu-open .burger span:nth-child(2){opacity:0}
body.menu-open .burger span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

.mnav{
  position:fixed; inset:0; z-index:110; background:var(--ink); color:#fff;
  padding:110px var(--gut) 48px;
  display:flex; flex-direction:column; justify-content:space-between;
  clip-path:inset(0 0 100% 0); transition:clip-path .6s var(--ease);
}
body.menu-open .mnav{clip-path:inset(0 0 0 0)}
.mnav a{display:block; font-family:var(--serif); font-size:clamp(1.6rem,6vw,2.2rem); padding:14px 0; border-bottom:1px solid var(--line-light)}
.mnav small{font-family:var(--mono); font-size:11px; letter-spacing:.2em; color:var(--blue-l); display:block; margin-bottom:26px}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:12px;
  padding:15px 28px; border:1px solid var(--ink); background:var(--ink); color:#fff;
  font-size:14px; letter-spacing:.08em; position:relative; overflow:hidden;
  transition:color .4s var(--ease), border-color .4s var(--ease);
}
.btn span{position:relative; z-index:1}
.btn::before{
  content:""; position:absolute; inset:0; background:var(--blue);
  transform:translateY(101%); transition:transform .45s var(--ease);
}
.btn:hover::before{transform:translateY(0)}
.btn:hover{border-color:var(--blue)}
.btn--ghost{background:transparent; color:inherit; border-color:currentColor}
.btn--ghost:hover{color:#fff}
.btn--ghost::before{background:var(--blue)}
.btn i{width:16px; height:16px; position:relative; z-index:1; transition:transform .4s var(--ease)}
.btn:hover i{transform:translateX(4px)}
.btn svg{width:16px; height:16px; stroke:currentColor; fill:none; stroke-width:1.4}

/* ---------- hero ---------- */
.hero{
  position:relative; min-height:clamp(620px,100vh,1060px);
  background:var(--ink); color:#fff; display:flex; flex-direction:column; justify-content:center;
  padding:130px 0 90px; overflow:hidden;
}
.hero__bg{position:absolute; inset:0; pointer-events:none}
.hero__bg svg{width:100%; height:100%}
.hero__glow{
  position:absolute; width:min(880px,88vw); aspect-ratio:1; right:-14%; top:-22%;
  background:radial-gradient(circle,rgba(46,124,190,.34),rgba(46,124,190,0) 62%);
  filter:blur(10px);
}
.hero__glow2{
  position:absolute; width:min(620px,70vw); aspect-ratio:1; left:-18%; bottom:-30%;
  background:radial-gradient(circle,rgba(163,131,91,.16),rgba(163,131,91,0) 65%);
}
.hero .wrap{position:relative; z-index:2; display:grid; grid-template-columns:1fr auto; gap:clamp(32px,5vw,80px); align-items:center}
.hero__eyebrow{
  font-family:var(--mono); font-size:11.5px; letter-spacing:.26em; text-transform:uppercase;
  color:var(--blue-l); margin-bottom:clamp(24px,3.4vw,40px);
  display:flex; align-items:center; gap:14px; flex-wrap:wrap;
}
.hero__eyebrow em{font-style:normal; opacity:.4}
.hero h1{font-family:var(--serif); font-size:clamp(2.05rem,4.6vw,3.9rem); line-height:1.3; letter-spacing:.02em; max-width:20ch}
.hero h1 .accent{color:var(--blue-l)}
.hero__sub{margin-top:clamp(26px,3vw,38px); font-size:clamp(.95rem,1.15vw,1.06rem); line-height:2; color:rgba(232,238,244,.74); max-width:46ch}
.hero__act{margin-top:clamp(34px,4vw,52px); display:flex; gap:16px; flex-wrap:wrap}
.hero__act .btn{border-color:rgba(255,255,255,.5); background:transparent; color:#fff}
.hero__act .btn::before{background:#fff}
.hero__act .btn:hover{color:var(--ink); border-color:#fff}
.hero__act .btn--solid{border-color:var(--blue); background:var(--blue)}
.hero__act .btn--solid::before{background:#fff}
.hero__act .btn--solid:hover{color:var(--ink); border-color:#fff}

.sijv{display:flex; flex-direction:column; height:clamp(300px,40vh,420px)}
.sijv__verse{display:flex; gap:clamp(10px,1.4vw,22px); flex:1; min-height:0}
.sijv__row{display:flex; flex-direction:column; align-items:center; gap:0}
.sijv p{
  writing-mode:vertical-rl; text-orientation:upright;
  font-family:var(--serif); font-size:clamp(15px,1.45vw,20px); letter-spacing:.34em;
  color:rgba(255,255,255,.9); margin:0 0 14px; line-height:1.15;
  padding-bottom:14px; position:relative;
}
.sijv__row::after{content:""; width:1px; flex:1; background:linear-gradient(to bottom,rgba(255,255,255,.28),transparent)}
.sijv__row:nth-child(2) p{color:rgba(255,255,255,.8)}
.sijv__row:nth-child(3) p{color:rgba(255,255,255,.68)}
.sijv__row:nth-child(4) p{color:rgba(255,255,255,.56)}
.hero__foot{
  position:absolute; left:0; right:0; bottom:0; z-index:2;
  border-top:1px solid var(--line-light);
}
.hero__foot .wrap{display:flex; justify-content:space-between; gap:20px; padding-top:18px; padding-bottom:18px; flex-wrap:wrap}
.hero__foot span{font-family:var(--mono); font-size:10.5px; letter-spacing:.2em; text-transform:uppercase; color:rgba(255,255,255,.46)}

/* ---------- page head (subpages) ---------- */
.phead{
  background:var(--ink); color:#fff; padding:calc(88px + clamp(56px,8vw,104px)) 0 clamp(48px,6vw,80px);
  position:relative; overflow:hidden;
}
.phead__glow{position:absolute; width:min(760px,80vw); aspect-ratio:1; right:-12%; top:-38%;
  background:radial-gradient(circle,rgba(46,124,190,.3),rgba(46,124,190,0) 64%);}
.phead .wrap{position:relative; z-index:2}
.phead h1{font-family:var(--serif); font-size:clamp(1.95rem,4vw,3.15rem); line-height:1.3; max-width:24ch}
.phead .lead{margin-top:24px; max-width:56ch}
.crumb{font-family:var(--mono); font-size:10.5px; letter-spacing:.2em; text-transform:uppercase; color:rgba(255,255,255,.42); margin-bottom:26px}
.crumb a:hover{color:#fff}

/* ---------- intro facts ---------- */
.facts{display:grid; grid-template-columns:repeat(3,1fr); border-top:1px solid var(--line)}
.facts > div{padding:clamp(26px,3vw,40px) clamp(18px,2.4vw,34px) clamp(24px,3vw,36px) 0; border-right:1px solid var(--line)}
.facts > div:last-child{border-right:0; padding-right:0}
.facts h4{font-family:var(--serif); font-size:1.02rem; letter-spacing:.1em; margin-bottom:12px}
.facts p{font-size:13.6px; line-height:1.9; color:var(--muted); margin:0}

/* ---------- cluster list ---------- */
.cl{display:grid; border-top:1px solid var(--line)}
.cl__row{
  display:grid; grid-template-columns:64px 1.26fr 1.46fr minmax(46px,auto); gap:clamp(16px,3vw,44px);
  padding:clamp(26px,3.2vw,40px) 0; border-bottom:1px solid var(--line);
  align-items:start; position:relative; transition:background .45s var(--ease), padding .45s var(--ease);
}
.cl__row::before{
  content:""; position:absolute; left:calc(-1 * var(--gut)); right:calc(-1 * var(--gut)); top:0; bottom:0;
  background:rgba(46,124,190,.045); opacity:0; transition:opacity .45s var(--ease);
}
.cl__row:hover::before{opacity:1}
.cl__num{font-family:var(--mono); font-size:12px; letter-spacing:.12em; color:var(--gold); padding-top:8px}
.cl__name{font-family:var(--serif); font-size:clamp(1.12rem,1.55vw,1.32rem); line-height:1.55; letter-spacing:.01em}
.cl__name em{display:block; font-style:normal; font-family:var(--sans); font-size:12px; letter-spacing:.16em; color:var(--muted); margin-top:10px; text-transform:uppercase}
.cl__desc{font-size:14.2px; line-height:1.95; color:var(--muted)}
.cl__desc strong{color:var(--text); font-weight:500}
.cl__row > .cl__num:last-child{align-self:start; justify-self:end; margin-top:8px; white-space:nowrap; font-size:11px}
.cl__go{width:34px; height:34px; border:1px solid var(--line); border-radius:50%; display:grid; place-items:center; justify-self:end; margin-top:6px; transition:background .4s var(--ease), border-color .4s var(--ease), transform .4s var(--ease)}
.cl__go svg{width:13px; height:13px; stroke:currentColor; fill:none; stroke-width:1.5}
.cl__row:hover .cl__go{background:var(--blue); border-color:var(--blue); color:#fff; transform:translateX(3px)}

/* ---------- two directions ---------- */
.dir{display:grid; grid-template-columns:1fr 1fr; gap:1px; background:var(--line); border:1px solid var(--line)}
.dir__cell{background:var(--paper); padding:clamp(28px,4vw,52px); position:relative; transition:background .5s var(--ease)}
.sec--paper2 .dir__cell{background:var(--paper-2)}
.dir__cell:hover{background:#fff}
.dir__cell h3{font-family:var(--serif); font-size:clamp(1.4rem,2.2vw,1.9rem); margin-bottom:8px}
.dir__cell .en{font-family:var(--mono); font-size:10.5px; letter-spacing:.2em; text-transform:uppercase; color:var(--blue); margin-bottom:22px}
.dir__cell p{font-size:14.2px; color:var(--muted); line-height:1.95}
.dir__cell ul{margin:22px 0 0; padding:0; list-style:none; border-top:1px solid var(--line)}
.dir__cell li{font-size:13.6px; padding:11px 0; border-bottom:1px solid var(--line-soft); color:var(--text); display:flex; gap:10px}
.dir__cell li::before{content:""; width:5px; height:5px; background:var(--blue); flex:none; margin-top:9px; transform:rotate(45deg)}

/* ---------- taxonomy table ---------- */
.tbl{width:100%; border-collapse:collapse; font-size:13.8px}
.tbl caption{text-align:left; font-family:var(--serif); font-size:1.05rem; padding-bottom:16px; color:var(--text)}
.tbl th,.tbl td{padding:13px 16px 13px 0; text-align:left; border-bottom:1px solid var(--line); vertical-align:top}
.tbl thead th{font-family:var(--mono); font-size:10.5px; letter-spacing:.16em; text-transform:uppercase; color:var(--gold); border-bottom:1px solid var(--ink); font-weight:400; padding-top:0}
.tbl td:first-child{color:var(--muted); font-family:var(--mono); font-size:12px; letter-spacing:.06em; width:52px}
.tbl tbody tr:hover{background:rgba(46,124,190,.04)}
.tag{
  display:inline-block; font-size:11.5px; letter-spacing:.06em; padding:2px 9px;
  border:1px solid var(--line); color:var(--muted); margin:0 6px 6px 0; white-space:nowrap;
}
.tag--on{border-color:var(--blue); color:var(--blue); background:rgba(46,124,190,.06)}
.code{font-family:var(--mono); font-size:11.5px; letter-spacing:.1em; color:var(--gold)}

/* ---------- stats ---------- */
.stats{display:grid; grid-template-columns:repeat(4,1fr); border-top:1px solid var(--line-light)}
.stats > div{padding:clamp(24px,3vw,38px) 20px clamp(20px,3vw,34px) 0; border-right:1px solid var(--line-light)}
.stats > div:last-child{border-right:0}
.stats b{display:block; font-family:var(--serif); font-size:clamp(2.1rem,3.6vw,3.2rem); font-weight:400; line-height:1; letter-spacing:.01em}
.stats b i{font-style:normal; font-size:.44em; margin-left:5px; color:var(--blue-l); letter-spacing:0}
.stats > div > span{display:block; margin-top:14px; font-size:12.8px; line-height:1.8; color:rgba(232,238,244,.62)}

/* ---------- cards ---------- */
.grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border:1px solid var(--line)}
.grid-2{display:grid; grid-template-columns:repeat(2,1fr); gap:1px; background:var(--line); border:1px solid var(--line)}
.card{background:var(--paper); padding:clamp(24px,3vw,40px); position:relative; transition:background .5s var(--ease)}
.sec--paper2 .card{background:var(--paper-2)}
.card:hover{background:#fff}
.card__ico{width:34px; height:34px; margin-bottom:22px; color:var(--blue)}
.card__ico svg{width:100%; height:100%; stroke:currentColor; fill:none; stroke-width:1.15}
.card h4{font-family:var(--serif); font-size:1.1rem; margin-bottom:12px; letter-spacing:.04em}
.card p{font-size:13.6px; line-height:1.95; color:var(--muted); margin:0}
.card ul{margin:16px 0 0; padding:0; list-style:none; font-size:13.2px; color:var(--muted)}
.card ul li{padding:7px 0; border-top:1px solid var(--line-soft); display:flex; gap:9px}
.card ul li::before{content:""; width:4px; height:4px; border-radius:50%; background:var(--gold); flex:none; margin-top:10px}

/* ---------- process ---------- */
.proc{display:grid; grid-template-columns:repeat(5,1fr); gap:0; border-top:1px solid var(--line)}
.proc > div{padding:30px 22px 30px 0; border-right:1px solid var(--line); position:relative}
.proc > div:last-child{border-right:0}
.proc .n{font-family:var(--mono); font-size:11px; letter-spacing:.16em; color:var(--gold)}
.proc h4{font-family:var(--serif); font-size:1.05rem; margin:14px 0 10px}
.proc p{font-size:12.9px; line-height:1.85; color:var(--muted); margin:0}

/* ---------- quote / brand story ---------- */
.story{display:grid; grid-template-columns:1fr 1.15fr; gap:clamp(36px,6vw,96px); align-items:center}
.story__v{display:flex; gap:clamp(8px,1.4vw,20px); justify-content:center}
.story__v div{width:1px; flex:1; max-width:64px}
.story__v p{
  writing-mode:vertical-rl; font-family:var(--serif); font-size:clamp(17px,2.1vw,26px);
  letter-spacing:.3em; line-height:1.2; margin:0 auto; color:var(--ink);
}
.story__v div:nth-child(2) p{opacity:.86}
.story__v div:nth-child(3) p{opacity:.72}
.story__v div:nth-child(4) p{opacity:.58}

/* ---------- notes ---------- */
.notes{counter-reset:n; list-style:none; margin:0; padding:0; font-size:13.4px; color:var(--muted); line-height:1.95}
.notes li{position:relative; padding:9px 0 9px 34px; border-bottom:1px solid var(--line-soft)}
.notes li::before{
  counter-increment:n; content:counter(n,decimal-leading-zero);
  position:absolute; left:0; top:9px; font-family:var(--mono); font-size:10.5px; letter-spacing:.1em; color:var(--gold);
}

/* ---------- CTA ---------- */
.cta{background:var(--ink); color:#fff; position:relative; overflow:hidden}
.cta__glow{position:absolute; width:min(700px,80vw); aspect-ratio:1; left:50%; top:-60%; transform:translateX(-50%);
  background:radial-gradient(circle,rgba(46,124,190,.3),rgba(46,124,190,0) 65%)}
.cta .wrap{position:relative; z-index:2; text-align:center}
.cta h2{font-family:var(--serif); font-size:clamp(1.7rem,3.4vw,2.9rem); line-height:1.4}
.cta p{margin:22px auto 0; max-width:52ch; color:rgba(232,238,244,.7); font-size:14.6px}
.cta__act{margin-top:clamp(32px,4vw,46px); display:flex; gap:16px; justify-content:center; flex-wrap:wrap}
.cta .btn{border-color:rgba(255,255,255,.45); background:transparent; color:#fff}
.cta .btn::before{background:#fff}
.cta .btn:hover{color:var(--ink); border-color:#fff}

/* ---------- footer ---------- */
.ft{background:var(--ink-2); color:rgba(232,238,244,.62); font-size:13.2px; padding:clamp(48px,6vw,76px) 0 34px}
.ft__top{display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:clamp(24px,4vw,56px); padding-bottom:clamp(34px,4vw,52px); border-bottom:1px solid var(--line-light)}
.ft h5{font-family:var(--mono); font-size:10.5px; letter-spacing:.2em; text-transform:uppercase; color:rgba(255,255,255,.4); font-weight:400; margin:0 0 18px}
.ft a{display:block; padding:5px 0; transition:color .3s}
.ft a:hover{color:#fff}
.ft__brand{display:flex; align-items:center; gap:14px; margin-bottom:22px}
.ft__brand img{width:42px}
.ft__brand b{font-family:var(--serif); font-size:15.5px; font-weight:400; color:#fff; letter-spacing:.16em; display:block}
.ft__brand span{font-family:var(--mono); font-size:8.5px; letter-spacing:.16em; opacity:.5; display:block; margin-top:4px}
.ft__bot{display:flex; justify-content:space-between; gap:18px; padding-top:26px; flex-wrap:wrap; font-family:var(--mono); font-size:10.5px; letter-spacing:.14em; color:rgba(232,238,244,.36); text-transform:uppercase}
.ft address{font-style:normal; line-height:2}

/* ---------- reveal ---------- */
.rv{opacity:0; transform:translateY(22px); transition:opacity .9s var(--ease), transform .9s var(--ease)}
.rv.in{opacity:1; transform:none}
.rv-d1{transition-delay:.09s}
.rv-d2{transition-delay:.18s}
.rv-d3{transition-delay:.27s}
.rv-d4{transition-delay:.36s}
@media (prefers-reduced-motion:reduce){
  .rv{opacity:1!important; transform:none!important; transition:none}
  html{scroll-behavior:auto}
  *{animation:none!important}
}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .hero .wrap{grid-template-columns:1fr}
  .sijv{display:none}
  .facts{grid-template-columns:1fr}
  .facts > div{border-right:0; border-bottom:1px solid var(--line); padding-right:0}
  .facts > div:last-child{border-bottom:0}
  .grid-3{grid-template-columns:1fr 1fr}
  .proc{grid-template-columns:1fr 1fr}
  .proc > div{border-bottom:1px solid var(--line)}
  .proc > div:nth-child(2n){border-right:0}
  .stats{grid-template-columns:1fr 1fr}
  .stats > div:nth-child(2n){border-right:0}
  .story{grid-template-columns:1fr; gap:44px}
  .story__v{justify-content:flex-start}
  .ft__top{grid-template-columns:1fr 1fr}
}
@media (max-width:860px){
  .nav,.hd__cta{display:none}
  .burger{display:block}
  .hd{height:72px}
  .cl__row{grid-template-columns:56px 1fr; gap:14px}
  .cl__desc{grid-column:2}
  .cl__go{display:none}
  .dir{grid-template-columns:1fr}
  .grid-2,.grid-3{grid-template-columns:1fr}
  .duo,.duo--12,.duo--111,.duo--1105,.duo--1115,.duo--2115,.duo--side{grid-template-columns:1fr}
  .hero{min-height:auto; padding:112px 0 64px}
  .hero__foot{position:static; margin-top:48px}
  .hero__foot .wrap{display:grid; grid-template-columns:1fr 1fr; gap:12px 16px}
  .hero__eyebrow{font-size:10px; letter-spacing:.16em; gap:9px}
  .hero__eyebrow em{display:none}
}
@media (max-width:560px){
  .proc{grid-template-columns:1fr}
  .proc > div{border-right:0}
  .stats{grid-template-columns:1fr}
  .stats > div{border-right:0; border-bottom:1px solid var(--line-light)}
  .ft__top{grid-template-columns:1fr}
  .hero__act .btn,.cta__act .btn{width:100%; justify-content:center}
  .tbl{font-size:12.6px}
  .tbl th,.tbl td{padding:11px 10px 11px 0}
}

/* ---------- cluster detail (services page) ---------- */
.cd{
  display:grid; grid-template-columns:minmax(240px,320px) 1fr;
  gap:clamp(24px,4vw,72px);
  padding:clamp(40px,5.4vw,72px) 0;
  border-top:1px solid var(--line);
  scroll-margin-top:96px;
}
.cd:last-of-type{border-bottom:1px solid var(--line)}
.cd__side{position:sticky; top:104px; align-self:start}
.cd__pos{
  display:inline-block; margin-top:18px; padding:6px 13px;
  border:1px solid var(--blue); color:var(--blue);
  font-size:12px; letter-spacing:.1em;
}
.cd__bench{margin-top:20px; font-size:12.6px; line-height:1.8; color:var(--muted)}
.cd__bench b{display:block; font-family:var(--mono); font-size:9.8px; letter-spacing:.18em; text-transform:uppercase; color:var(--gold); margin-bottom:6px; font-weight:400}
.cd__side h2{margin-top:16px; font-family:var(--serif); font-size:clamp(1.24rem,1.9vw,1.6rem); line-height:1.45}
.cd__main .lead{max-width:none; font-size:14.8px}
.cd__units{display:grid; grid-template-columns:1fr 1fr; gap:1px; background:var(--line); margin-top:clamp(26px,3.2vw,40px); border:1px solid var(--line)}
.cd__units > div{background:var(--paper); padding:clamp(18px,2.2vw,26px)}
.cd__units h5{margin:0 0 10px; font-family:var(--serif); font-size:.98rem; letter-spacing:.05em; font-weight:400}
.cd__units p{margin:0; font-size:12.9px; line-height:1.9; color:var(--muted)}
@media (max-width:900px){
  .cd{grid-template-columns:1fr; gap:22px}
  .cd__side{position:static}
  .cd__units{grid-template-columns:1fr}
}

/* ---------- report page ---------- */
.tbl tr.grp td{
  background:var(--paper-2); font-family:var(--serif); font-size:.92rem; letter-spacing:.08em;
  color:var(--text); padding:12px 14px; border-bottom:1px solid var(--line); border-top:1px solid var(--line);
}
.tbl tr.grp td:first-child{font-family:var(--mono); color:var(--blue); font-size:11px}
.tbl tr.grp:hover{background:none}
.tbl .u{color:var(--muted); font-family:var(--mono); font-size:11.5px; white-space:nowrap; text-align:right}

.formula{
  border:1px solid var(--line); background:#fff; padding:clamp(22px,3vw,34px);
  display:grid; gap:26px;
}
.formula > div{border-top:1px solid var(--line-soft); padding-top:20px}
.formula > div:first-child{border-top:0; padding-top:0}
.formula h5{
  margin:0 0 12px; font-family:var(--mono); font-size:10px; letter-spacing:.18em;
  text-transform:uppercase; color:var(--gold); font-weight:400;
}
.formula p{
  margin:0; font-family:var(--mono); font-size:12.6px; line-height:2.1; color:var(--text);
  word-break:break-word;
}
.formula p em{font-style:normal; color:var(--blue)}

.notebox{
  border-left:2px solid var(--blue); background:rgba(46,124,190,.05);
  padding:clamp(20px,2.6vw,30px); font-size:13.4px; line-height:1.95; color:var(--text);
}
.notebox b{display:block; font-family:var(--serif); font-size:.98rem; letter-spacing:.06em; margin-bottom:10px; font-weight:400}

/* ---------- about extras ---------- */
.mission{display:grid; grid-template-columns:repeat(2,1fr); gap:1px; background:var(--line); border:1px solid var(--line)}
.mission > div{background:var(--paper); padding:clamp(24px,3vw,40px)}
.mission .n{font-family:var(--mono); font-size:11px; letter-spacing:.16em; color:var(--gold)}
.mission h4{font-family:var(--serif); font-size:1.08rem; margin:14px 0 12px; line-height:1.5}
.mission p{font-size:13.4px; line-height:1.95; color:var(--muted); margin:0}
.sec--paper2 .mission > div{background:var(--paper-2)}

.reg{width:100%; border-collapse:collapse; font-size:13.6px}
.reg th,.reg td{padding:14px 0; border-bottom:1px solid var(--line); text-align:left; vertical-align:top}
.reg th{width:150px; font-weight:400; color:var(--muted); font-size:12.4px; letter-spacing:.06em}
.reg td{color:var(--text)}

.doc-list{display:grid; gap:1px; background:var(--line); border:1px solid var(--line)}
.doc-list > a{background:var(--paper); padding:20px clamp(16px,2.4vw,28px); display:flex; align-items:center; justify-content:space-between; gap:16px; transition:background .4s var(--ease)}
.doc-list > a:hover{background:#fff}
.doc-list b{font-family:var(--serif); font-weight:400; font-size:1rem}
.doc-list span{font-family:var(--mono); font-size:10.5px; letter-spacing:.14em; color:var(--muted); text-transform:uppercase}
.sec--paper2 .doc-list > a{background:var(--paper-2)}

/* ---------- contact ---------- */
.cgrid{display:grid; grid-template-columns:1fr 1.15fr; gap:clamp(32px,5vw,80px); align-items:start}
.form{display:grid; gap:20px}
.field{display:grid; gap:9px}
.field label{font-family:var(--mono); font-size:10.5px; letter-spacing:.18em; text-transform:uppercase; color:var(--gold)}
.field input,.field select,.field textarea{
  width:100%; padding:13px 0; border:0; border-bottom:1px solid var(--line);
  background:transparent; font:inherit; font-size:14.5px; color:var(--text);
  border-radius:0; outline:none; transition:border-color .35s var(--ease);
}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--blue)}
.field textarea{resize:vertical; min-height:104px; line-height:1.85}
.field select{appearance:none; background-image:linear-gradient(45deg,transparent 50%,var(--muted) 50%),linear-gradient(135deg,var(--muted) 50%,transparent 50%); background-position:calc(100% - 12px) 21px,calc(100% - 7px) 21px; background-size:5px 5px,5px 5px; background-repeat:no-repeat}
.form__row{display:grid; grid-template-columns:1fr 1fr; gap:20px}
.form__msg{font-size:13px; color:var(--blue); min-height:22px}
.info-list{display:grid; gap:0; border-top:1px solid var(--line)}
.info-list > div{padding:20px 0; border-bottom:1px solid var(--line); display:grid; grid-template-columns:96px 1fr; gap:16px; align-items:start}
.info-list dt,.info-list .k{font-family:var(--mono); font-size:10.5px; letter-spacing:.16em; text-transform:uppercase; color:var(--gold); padding-top:4px}
.info-list .v{font-size:14.2px; line-height:1.9}
.info-list .v small{display:block; color:var(--muted); font-size:12.4px; margin-top:4px}
@media (max-width:900px){
  .mission{grid-template-columns:1fr}
  .cgrid{grid-template-columns:1fr; gap:44px}
  .form__row{grid-template-columns:1fr}
  .reg th{width:112px}
  .info-list > div{grid-template-columns:1fr; gap:6px}
}

/* ---------- brand logo swap ---------- */
.brand .logo-b{display:none}
.hd.on .brand .logo-w{display:none}
.hd.on .brand .logo-b{display:block}

/* --- taxonomy table --- */
.tbl--tax{table-layout:fixed}
.tbl--tax th,.tbl--tax td{padding-right:22px}
.tbl--tax thead th:first-child,.tbl--tax td:first-child{width:auto}
.tbl--tax td:nth-child(2){font-family:var(--sans); font-size:13.6px; letter-spacing:0; color:var(--text)}
.tbl--tax td:nth-child(3) .tag{margin-bottom:8px}
.tbl--tax td:nth-child(4){font-size:12.8px; line-height:1.8}

/* --- indicator blocks --- */
.ind{display:grid; grid-template-columns:1fr 1fr; gap:clamp(28px,4.5vw,64px); align-items:start}
.ind__col{display:grid; gap:clamp(28px,3.4vw,44px)}
.ind__blk h4{
  margin:0 0 6px; padding-bottom:12px; border-bottom:1px solid var(--ink);
  font-family:var(--serif); font-size:1rem; letter-spacing:.08em; font-weight:400;
}
.ind__blk h4 span{font-family:var(--mono); font-size:11px; color:var(--blue); margin-right:8px; letter-spacing:.1em}
.tbl--ind{width:100%; border-collapse:collapse; font-size:13.2px}
.tbl--ind td{padding:9px 0; border-bottom:1px solid var(--line-soft); vertical-align:top; line-height:1.6}
.tbl--ind td:first-child{font-family:var(--mono); font-size:10.5px; letter-spacing:.06em; color:var(--muted); width:40px; padding-right:14px}
.tbl--ind td:last-child{font-family:var(--mono); font-size:11px; color:var(--muted); white-space:nowrap; text-align:right; padding-left:12px}
.tbl--ind tr:hover td{background:rgba(46,124,190,.04)}
@media (max-width:900px){
  .ind{grid-template-columns:1fr; gap:38px}
}

/* ---------- sijv caption ---------- */
.sijv__cap{
  align-self:flex-end; margin-bottom:18px; white-space:nowrap;
  font-family:var(--mono); font-size:10px; letter-spacing:.2em;
  color:rgba(255,255,255,.34);
}

/* ---------- long legal name (English) ---------- */
.brand-txt span{white-space:nowrap; font-size:8px; letter-spacing:.1em}
.nav a{white-space:nowrap}
.ft__brand span{line-height:1.7; max-width:320px}
@media (max-width:1240px){
  .brand-txt span{white-space:normal; max-width:188px; line-height:1.65; letter-spacing:.09em}
  .hd__in{gap:clamp(14px,2vw,30px)}
}
@media (max-width:860px){
  .brand-txt span{white-space:nowrap; max-width:none}
}
@media (max-width:560px){
  .brand-txt span{display:none}
}

/* ---------- compliance: footer legal row ---------- */
.ft__legal{
  display:flex; flex-wrap:wrap; gap:10px 22px; align-items:center;
  padding:22px 0; border-top:1px solid rgba(255,255,255,.1);
  font-family:var(--mono); font-size:10.5px; letter-spacing:.12em;
  color:rgba(232,238,244,.5);
}
.ft__legal a{color:rgba(232,238,244,.62); transition:color .3s var(--ease)}
.ft__legal a:hover{color:#fff}
.ft__bot{border-top:0}

/* ---------- compliance: inline disclaimer ---------- */
.disc{
  font-size:11.6px; line-height:1.95; letter-spacing:.02em;
  padding-top:16px; border-top:1px solid var(--line);
}
.sec--paper2 .disc{border-top-color:var(--line-soft)}

/* ---------- compliance: consent ---------- */
.consent{
  display:flex; gap:10px; align-items:flex-start; cursor:pointer;
  font-size:12.4px; line-height:1.75; color:var(--muted); padding:4px 0 2px;
}
.consent input{
  appearance:none; -webkit-appearance:none; flex:none;
  width:15px; height:15px; margin-top:3px; border:1px solid var(--line);
  background:#fff; position:relative; cursor:pointer; transition:border-color .3s var(--ease);
}
.consent input:checked{border-color:var(--blue); background:var(--blue)}
.consent input:checked::after{
  content:""; position:absolute; left:4px; top:1px; width:5px; height:9px;
  border-right:1.5px solid #fff; border-bottom:1.5px solid #fff; transform:rotate(42deg);
}
.consent:focus-within input{border-color:var(--blue)}
.consent input:focus-visible{outline:2px solid rgba(46,124,190,.35); outline-offset:2px}
.consent a{color:var(--blue); border-bottom:1px solid rgba(46,124,190,.35)}

/* ---------- legal page ---------- */
.legal-toc{
  display:grid; grid-template-columns:repeat(4,1fr); gap:1px;
  background:var(--line); border:1px solid var(--line); margin-bottom:clamp(38px,5vw,64px);
}
.legal-toc a{
  background:var(--paper); padding:16px 18px; font-size:12.6px; color:var(--muted);
  transition:background .35s var(--ease), color .35s var(--ease);
}
.legal-toc a:hover{background:#fff; color:var(--blue)}
.legal{display:grid; gap:clamp(36px,4.4vw,56px); max-width:78ch}
.legal article{scroll-margin-top:100px}
.legal .kicker{margin-bottom:12px; color:var(--gold)}
.legal h4{
  margin:0 0 18px; padding-bottom:12px; border-bottom:1px solid var(--ink);
  font-family:var(--serif); font-size:clamp(1.14rem,1.7vw,1.34rem); font-weight:400; letter-spacing:.06em;
}
.legal h5{
  margin:26px 0 8px; font-family:var(--serif); font-size:14.6px; font-weight:400;
  letter-spacing:.04em; color:var(--text);
}
.legal p{margin:0 0 12px; font-size:13.6px; line-height:2.05; color:var(--muted)}
.legal p b,.legal li b{color:var(--text); font-weight:600}
.legal li{margin:0 0 9px; font-size:13.6px; line-height:2.05; color:var(--muted)}
.legal ul{margin:0 0 14px; padding-left:18px}
.legal ul li::marker{color:var(--blue)}
.legal a{color:var(--blue); border-bottom:1px solid rgba(46,124,190,.3)}
.legal .reg{margin:6px 0 18px}
.legal-date{
  margin-top:22px; font-family:var(--mono); font-size:10.5px; letter-spacing:.14em;
  color:rgba(0,0,0,.35); text-transform:uppercase;
}
@media (max-width:900px){
  .legal-toc{grid-template-columns:1fr 1fr}
  .legal{max-width:none}
}
@media (max-width:560px){
  .legal-toc{grid-template-columns:1fr}
}

/* ---------- footer copyright / ICP ---------- */
.ft__bot{align-items:flex-start}
.ft__copy{line-height:1.95; text-transform:none; letter-spacing:.06em; font-size:11px; color:rgba(232,238,244,.5)}
.ft__icp{
  display:inline-block; margin-top:9px;
  font-size:10.5px; letter-spacing:.04em; text-transform:none;
  color:rgba(232,238,244,.46);
  border-bottom:1px solid rgba(232,238,244,.16);
  transition:color .3s var(--ease), border-color .3s var(--ease);
}
.ft__icp:hover{color:#fff; border-color:rgba(255,255,255,.55)}

/* ---------- 404 ---------- */
.err-code{
  font-family:var(--mono); font-size:clamp(3.2rem,9vw,7rem); line-height:.9;
  color:rgba(255,255,255,.14); letter-spacing:-.02em; margin-bottom:14px;
}
.err-links{
  display:grid; grid-template-columns:repeat(3,1fr); gap:1px;
  background:var(--line); border:1px solid var(--line);
}
.err-links a{
  background:var(--paper); padding:clamp(20px,2.6vw,32px);
  display:grid; gap:8px; transition:background .4s var(--ease);
}
.err-links a:hover{background:#fff}
.err-links .k{font-family:var(--mono); font-size:10.5px; letter-spacing:.16em; color:var(--gold)}
.err-links b{font-family:var(--serif); font-size:1.06rem; font-weight:400; letter-spacing:.05em}
.err-links em{font-style:normal; font-size:12.6px; line-height:1.7; color:var(--muted)}
@media (max-width:900px){ .err-links{grid-template-columns:1fr 1fr} }
@media (max-width:560px){ .err-links{grid-template-columns:1fr} }

/* ---------- language switch (segmented buttons) ---------- */
.langsw{
  flex:none; display:inline-flex; align-items:stretch;
  border:1px solid var(--line-light);
  transition:border-color .35s var(--ease);
}
.langsw__b{
  display:inline-flex; align-items:center; justify-content:center;
  min-width:42px; height:30px; padding:0 11px;
  font-family:var(--mono); font-size:10.5px; letter-spacing:.12em; line-height:1;
  color:rgba(255,255,255,.6);
  transition:background .3s var(--ease), color .3s var(--ease);
}
.langsw__b + .langsw__b{border-left:1px solid var(--line-light)}
.langsw__b.is-on{background:#fff; color:var(--ink); cursor:default}
.langsw__b:not(.is-on):hover{background:rgba(255,255,255,.14); color:#fff}
/* light header */
.hd.on .langsw{border-color:var(--line)}
.hd.on .langsw__b{color:var(--muted)}
.hd.on .langsw__b + .langsw__b{border-left-color:var(--line)}
.hd.on .langsw__b:not(.is-on):hover{background:rgba(10,26,42,.055); color:var(--ink)}
.hd.on .langsw__b.is-on{background:var(--ink); color:#fff}

/* mobile menu */
.mnav .mnav__lang{display:flex; gap:9px; margin-bottom:24px}
.mnav .mnav__lang a,
.mnav .mnav__lang span{
  display:inline-flex; align-items:center; justify-content:center;
  font-family:var(--mono); font-size:12px; letter-spacing:.14em;
  padding:9px 17px; min-width:64px;
  border:1px solid rgba(255,255,255,.22); border-bottom:1px solid rgba(255,255,255,.22);
  color:rgba(255,255,255,.6);
}
.mnav .mnav__lang .is-on{background:#fff; color:var(--ink); border-color:#fff}

/* footer */
.ft__lang{
  margin-left:auto; display:inline-flex; flex:none;
  border:1px solid rgba(255,255,255,.16);
}
.ft__lang a,.ft__lang span{
  display:inline-flex; align-items:center; padding:5px 11px;
  font-family:var(--mono); font-size:10px; letter-spacing:.12em;
  color:rgba(255,255,255,.55);
  transition:background .3s var(--ease), color .3s var(--ease);
}
.ft__lang a + a,.ft__lang span + a,.ft__lang a + span{border-left:1px solid rgba(255,255,255,.16)}
.ft__lang .is-on{background:#fff; color:var(--ink); cursor:default}
.ft__lang a:hover{background:rgba(255,255,255,.14); color:#fff}

@media (max-width:860px){
  .langsw{margin-left:auto}
  .langsw__b{height:28px; min-width:38px; padding:0 9px}
  .langsw ~ .burger{margin-left:10px}
}

/* ---------- narrow-header tightening (fits the 中/EN buttons) ---------- */
@media (max-width:1120px){
  .brand-txt span{white-space:normal; max-width:180px; font-size:7.8px; letter-spacing:.05em; line-height:1.55}
  .nav{gap:clamp(12px,1.7vw,22px)}
  .nav a{font-size:13px}
  .hd__cta{padding:10px 14px; font-size:12px}
}