/* Infra·sapiens — shared site styles. Zero build, one file. */

:root{
  --ink:#050507; --panel:#0C0C10; --line:#1B1626;
  --bone:#EDEAE3; --ash:#8A8A85; --dim:#565658;
  --uv:#B79CFF; --uv-deep:#7C6FA8;
  --sans:"Inter","Segoe UI Variable Display","Segoe UI",system-ui,-apple-system,sans-serif;
  --mono:"JetBrains Mono","Cascadia Mono",Consolas,"Liberation Mono",monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--ink);color:var(--bone);font-family:var(--sans);-webkit-font-smoothing:antialiased;line-height:1.6}
a{color:inherit;text-decoration:none}
/* bilingual: EN is the default; ZH shown only when html.lang-zh is set */
html.lang-zh [lang="en"]{display:none}
html:not(.lang-zh) [lang="zh"]{display:none}
/* the language switch link carries lang of the OTHER version — never hide it */
html.lang-zh a.langsw[lang="en"],html:not(.lang-zh) a.langsw[lang="zh"]{display:inline-block}
.wrap{max-width:920px;margin:0 auto;padding:0 28px}

/* header */
header{position:sticky;top:0;z-index:10;background:rgba(5,5,7,.86);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:11px;font-size:16px;letter-spacing:-.02em;font-weight:500}
.brand span.o{opacity:.35}
nav{display:flex;gap:26px;font-family:var(--mono);font-size:11.5px;letter-spacing:.02em;color:var(--ash)}
nav a:hover{color:var(--bone)}
nav a.on{color:var(--uv)}
@media(max-width:720px){nav{display:none}}

/* language switcher — always visible, even on mobile (nav hides there) */
.nav-right{display:flex;align-items:center;gap:24px}
.lang{display:flex;align-items:center;gap:6px;font-family:var(--mono);font-size:11.5px}
.lang button{background:none;border:1px solid var(--line);color:var(--ash);font:inherit;letter-spacing:.02em;padding:5px 10px;cursor:pointer;border-radius:6px;line-height:1;transition:color .15s,border-color .15s}
.lang button:hover{color:var(--bone)}
.lang button.active{color:var(--uv);border-color:var(--uv-deep)}
@media(max-width:720px){.nav-right nav{display:none}}

/* simple language switch link: jumps to the other full version of the site */
.langsw{font-family:var(--mono);font-size:11.5px;letter-spacing:.04em;color:var(--ash);border:1px solid var(--line);border-radius:6px;padding:5px 11px;line-height:1;transition:color .15s,border-color .15s}
.langsw:hover{color:var(--bone);border-color:var(--uv-deep)}

/* mobile menu — pure CSS (details/summary), zero JavaScript.
   The desktop nav is hidden below 720px, so this is the only way in. */
.mmenu{display:none;position:relative}
.mmenu>summary{list-style:none;cursor:pointer;width:36px;height:36px;display:grid;place-items:center;border:1px solid var(--line);border-radius:8px;color:var(--ash);transition:color .15s,border-color .15s}
.mmenu>summary::-webkit-details-marker{display:none}
.mmenu>summary:hover{color:var(--bone)}
.mmenu[open]>summary{color:var(--uv);border-color:var(--uv-deep)}
.mmenu .mnav{position:absolute;right:0;top:calc(100% + 16px);width:196px;display:grid;gap:2px;background:rgba(9,9,12,.985);border:1px solid var(--line);border-radius:12px;padding:7px;box-shadow:0 24px 50px rgba(0,0,0,.6);backdrop-filter:blur(14px);z-index:30}
.mmenu .mnav a{font-family:var(--mono);font-size:12px;letter-spacing:.03em;color:var(--ash);padding:11px 12px;border-radius:7px;transition:color .15s,background .15s}
.mmenu .mnav a:hover{color:var(--bone);background:rgba(183,156,255,.07)}
@media(max-width:720px){.mmenu{display:block}.nav-right{gap:12px}}

/* hero */
.hero{padding:104px 0 84px;position:relative;display:flex;gap:44px}
.hero .rule{width:1px;background:var(--uv);opacity:.5;flex:0 0 1px}
h1{font-size:clamp(34px,6vw,58px);line-height:1.04;letter-spacing:-.035em;font-weight:500;max-width:16ch}
.sub{margin-top:22px;font-size:16.5px;line-height:1.65;color:var(--ash);max-width:46ch}
.cta{margin-top:34px;display:flex;gap:12px;flex-wrap:wrap;font-family:var(--mono);font-size:12px}
.btn{border:1px solid var(--line);border-radius:6px;padding:10px 16px;color:var(--bone)}
.btn:hover{border-color:var(--uv-deep)}
.btn.solid{background:var(--bone);color:var(--ink);border-color:var(--bone)}

.dual{margin-top:56px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:26px 0;display:grid;gap:6px}
.dual div{font-family:var(--mono);font-size:15px;letter-spacing:.14em}
.dual .a{color:var(--bone)}
.dual .b{color:var(--dim)}
.dual p{font-size:12px;color:var(--ash);margin-top:10px;letter-spacing:0;font-family:var(--sans)}

/* sections */
section{padding:76px 0;border-top:1px solid var(--line)}
.lbl{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--dim);margin-bottom:26px}
h2{font-size:24px;font-weight:500;letter-spacing:-.02em;margin-bottom:16px}
p.big{font-size:16px;color:var(--ash);max-width:60ch}

/* catalog */
.cat{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:10px;overflow:hidden}
.row{background:var(--panel);padding:20px 22px;display:grid;grid-template-columns:150px 1fr auto;gap:20px;align-items:baseline}
.row:hover{background:#101017}
.row h3{font-size:15px;font-weight:500;letter-spacing:-.01em}
.row p{font-size:13.5px;color:var(--ash);line-height:1.55}
.st{font-family:var(--mono);font-size:10px;letter-spacing:.08em;text-transform:uppercase;border:1px solid var(--line);border-radius:4px;padding:3px 7px;color:var(--ash);white-space:nowrap}
.st.live{color:var(--uv);border-color:var(--uv-deep)}
@media(max-width:720px){.row{grid-template-columns:1fr;gap:8px}}

/* product sheets */
.sheets{display:grid;gap:18px;margin:32px 0 40px}
.sheet{display:grid;grid-template-columns:124px 1fr;gap:30px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:32px 34px;align-items:start;transition:border-color .15s}
.sheet:hover{border-color:#2A2040}
.sheet .mark{width:124px;height:124px;display:flex;align-items:center;justify-content:center;background:rgba(183,156,255,.04);border:1px solid var(--line);border-radius:10px;flex-shrink:0}
.sheet .kind{font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--uv);margin-bottom:10px}
.sheet h3{font-size:23px;font-weight:500;letter-spacing:-.02em;margin-bottom:10px}
.sheet .pitch{font-size:15px;color:var(--bone);line-height:1.65;margin-bottom:12px;max-width:58ch}
.sheet .desc{font-size:13.5px;color:var(--ash);line-height:1.65;margin-bottom:18px;max-width:62ch}
.sheet .head{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:2px}
.forza{display:grid;gap:9px;margin:0 0 20px;max-width:62ch}
.forza li{font-size:13px;color:var(--ash);line-height:1.6;padding-left:20px;position:relative;list-style:none}
.forza li::before{content:"";position:absolute;left:0;top:.55em;width:7px;height:7px;border:1px solid var(--uv);border-radius:50%}
.forza li b{color:var(--bone);font-weight:500}
.specs{display:flex;flex-wrap:wrap;gap:8px}
.specs span{font-family:var(--mono);font-size:10px;letter-spacing:.08em;text-transform:uppercase;border:1px solid var(--line);border-radius:4px;padding:3px 8px;color:var(--dim)}
.bench-lbl{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--dim);margin:8px 0 18px}
@media(max-width:720px){
  .sheet{grid-template-columns:1fr;gap:20px;padding:26px 22px}
  .sheet .mark{width:92px;height:92px}
}

/* method */
.rules{display:grid;gap:28px;grid-template-columns:repeat(3,1fr)}
@media(max-width:720px){.rules{grid-template-columns:1fr}}
.rules h3{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--uv);margin-bottom:10px}
.rules p{font-size:13.5px;color:var(--ash);line-height:1.7}

/* numbers */
table{width:100%;border-collapse:collapse;font-family:var(--mono);font-size:12.5px}
th,td{text-align:left;padding:11px 12px;border-bottom:1px solid var(--line)}
th{font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--dim);font-weight:400}
td.n{color:var(--uv)}
.src{font-size:11.5px;color:var(--dim);margin-top:14px;font-family:var(--mono)}

/* writing index */
.entries{border-top:1px solid var(--line);margin-top:30px}
.entry{display:grid;grid-template-columns:104px 1fr;gap:4px 22px;padding:22px 0;border-bottom:1px solid var(--line);align-items:start}
.entry .body{min-width:0}
.entry .date{font-family:var(--mono);font-size:11px;color:var(--dim);padding-top:3px}
.entry h3{font-size:16.5px;font-weight:500;letter-spacing:-.01em}
.entry:hover h3{color:var(--uv)}
.entry .kicker{display:inline-block;font-family:var(--mono);font-size:9.5px;letter-spacing:.08em;text-transform:uppercase;border:1px solid var(--line);border-radius:4px;padding:2px 7px;color:var(--ash);margin-left:10px;vertical-align:2px;white-space:nowrap}
.entry p{font-size:13.5px;color:var(--ash);margin-top:5px;line-height:1.6}
.entry .desc{margin-top:9px;display:grid;gap:4px}
.entry .desc p{margin-top:0;font-size:13.5px;line-height:1.6}
.entry.tight{padding:14px 0}
.entry.tight h3{font-size:15px}
@media(max-width:720px){.entry{grid-template-columns:1fr;gap:2px}.entry .date{padding-top:0}}

/* about timeline */
.tl{border-top:1px solid var(--line);margin-top:30px}
.tr{display:grid;grid-template-columns:170px 1fr;gap:22px;padding:26px 0;border-bottom:1px solid var(--line)}
.tr .when{font-family:var(--mono);font-size:11px;letter-spacing:.04em;color:var(--dim);padding-top:5px;text-transform:uppercase}
.tr h3{font-size:16.5px;font-weight:500;letter-spacing:-.01em;margin-bottom:7px}
.tr p{font-size:13.5px;color:var(--ash);line-height:1.7;max-width:62ch}
@media(max-width:720px){.tr{grid-template-columns:1fr;gap:6px}}

/* future article pages */
.prose{max-width:660px}
.prose p{font-size:16px;line-height:1.8;margin:0 0 1.25em;color:var(--bone)}
.prose h2{font-family:var(--mono);font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--uv);margin:2.4em 0 .8em;font-weight:400}
.prose blockquote{border-left:2px solid var(--uv-deep);padding:2px 0 2px 18px;color:var(--ash);margin:1.5em 0}
.prose code{font-family:var(--mono);font-size:.85em;background:var(--panel);border:1px solid var(--line);border-radius:4px;padding:1px 5px}

/* editorial figures — plates and duo blocks inside sections (nexusgroup.tech style) */
.fig{position:relative;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--panel)}
.fig img{width:100%;display:block;filter:saturate(.92) contrast(1.02)}
.fig figcaption{position:absolute;left:16px;bottom:14px;z-index:2;font-family:var(--mono);font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:rgba(237,234,227,.55)}
.fig.plate{margin:36px 0 8px}
.duo{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center;margin-top:10px}
.duo .fig{margin:0}
@media(max-width:720px){.duo{grid-template-columns:1fr;gap:26px}}

/* split hero with portrait */
.hero.split{display:grid;grid-template-columns:1.15fr .85fr;gap:52px;align-items:center}
.hero.split .rule{display:none}
.hero.split figure{position:relative;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:var(--panel)}
.hero.split figure img{display:block;width:100%;height:auto;filter:saturate(.92) contrast(1.02)}
.hero.split figure::after{content:"";position:absolute;inset:0;background:linear-gradient(to top,rgba(5,5,7,.35),transparent 40%);pointer-events:none}
.hero.split figcaption{position:absolute;left:16px;bottom:14px;z-index:2;font-family:var(--mono);font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:rgba(237,234,227,.6)}
@media(max-width:720px){.hero.split{grid-template-columns:1fr;gap:28px}}

/* br hero — full-viewport atmosphere */
.br{position:relative;min-height:100vh;display:flex;align-items:flex-end;overflow:hidden;border-bottom:1px solid var(--line)}
.br.mid{min-height:74vh}
.br.closer{min-height:66vh;align-items:center}
.br.mid h1.giant,.br.closer h1.giant{font-size:clamp(40px,7vw,84px)}
.br.closer .veil{background:linear-gradient(to top,rgba(5,5,7,.94),rgba(5,5,7,.72) 45%,rgba(5,5,7,.8))}
.br .backdrop{position:absolute;inset:0;z-index:0}
.br .backdrop img{width:100%;height:100%;object-fit:cover;object-position:center 38%;filter:saturate(.9) contrast(1.05);animation:slowzoom 40s ease-in-out infinite alternate}
.br .veil{position:absolute;inset:0;z-index:1;background:
  linear-gradient(to top, rgba(5,5,7,.96) 0%, rgba(5,5,7,.55) 30%, rgba(5,5,7,.15) 60%, rgba(5,5,7,.45) 100%)}
.br .veil::after{content:"";position:absolute;left:0;right:0;top:52%;height:1px;background:linear-gradient(to right,transparent,rgba(183,156,255,.55) 30%,rgba(183,156,255,.55) 70%,transparent);opacity:.6}
.br .inner{position:relative;z-index:2;width:100%}
.br .kicker{animation:rise 1.1s .15s both}
.br h1.giant{animation:rise 1.2s .3s both}
.br .ghost{animation:rise 1.2s .5s both}
.br .sub{animation:rise 1.2s .65s both}
.br .cta{animation:rise 1.2s .8s both}
@keyframes slowzoom{from{transform:scale(1)}to{transform:scale(1.06)}}
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:translateY(0)}}
@media(prefers-reduced-motion:reduce){.br .backdrop img,.br .kicker,.br h1.giant,.br .ghost,.br .sub,.br .cta{animation:none}}

/* film grain */
.grain{position:fixed;inset:-50%;z-index:60;pointer-events:none;opacity:.05;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)'/%3E%3C/svg%3E");animation:grain 8s steps(10) infinite}
@keyframes grain{0%,100%{transform:translate(0,0)}10%{transform:translate(-5%,-8%)}30%{transform:translate(3%,-12%)}50%{transform:translate(9%,4%)}70%{transform:translate(-7%,9%)}90%{transform:translate(4%,7%)}}
@media(prefers-reduced-motion:reduce){.grain{animation:none}}

/* horizon divider */
.horizon{height:1px;background:linear-gradient(to right,transparent,rgba(183,156,255,.5),transparent)}

/* arc — compressed chronology */
.arc{border-top:1px solid var(--line)}
.ev{display:grid;grid-template-columns:110px 1fr;gap:26px;padding:20px 0;border-bottom:1px solid var(--line);align-items:baseline}
.ev .yr{font-family:var(--mono);font-size:13px;color:var(--uv);letter-spacing:.04em}
.ev p{font-size:15px;color:var(--ash);line-height:1.7;max-width:64ch}
.ev p strong{color:var(--bone);font-weight:500}
@media(max-width:720px){.ev{grid-template-columns:1fr;gap:4px}}

/* mega hero — brand home (legacy variant) */
.hero.mega{padding:88px 0 72px}
.hero.mega>div:last-child{position:relative;flex:1;min-width:0}
.kicker{font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--dim);margin-bottom:28px}
h1.giant{font-size:clamp(46px,9.2vw,122px);line-height:.98;letter-spacing:-.045em;font-weight:500;max-width:none}
h1.giant .dot{color:var(--uv)}
.ghost{font-family:var(--mono);font-size:clamp(10px,1.6vw,13px);letter-spacing:.3em;text-transform:uppercase;color:var(--dim);margin-top:20px}
.marks{position:absolute;right:-40px;top:-30px;width:min(44vw,500px);opacity:.15;pointer-events:none;animation:drift 14s ease-in-out infinite}
.marks .ring{animation:breathe 7s ease-in-out infinite}
@keyframes drift{0%,100%{transform:translateY(0)}50%{transform:translateY(-14px)}}
@keyframes breathe{0%,100%{opacity:1}50%{opacity:.5}}
@media(max-width:720px){.marks{display:none}}
@media(prefers-reduced-motion:reduce){.marks,.marks .ring{animation:none}}

/* etymology blocks */
.def{border-top:1px solid var(--line);margin-top:36px}
.term{display:grid;grid-template-columns:72px 1fr;gap:22px;padding:28px 0;border-bottom:1px solid var(--line)}
.term .n{font-family:var(--mono);font-size:12px;color:var(--uv);padding-top:5px}
.term h3{font-family:var(--mono);font-size:15px;letter-spacing:.06em;font-weight:400;margin-bottom:4px}
.term .lat{font-family:var(--mono);font-size:11px;color:var(--dim);letter-spacing:.04em;margin-bottom:12px}
.term p{font-size:14.5px;color:var(--ash);line-height:1.75;max-width:62ch}
@media(max-width:720px){.term{grid-template-columns:1fr;gap:6px}}

/* doors */
.doors{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden;margin-top:36px}
.door{background:var(--panel);padding:28px 26px;display:flex;flex-direction:column;gap:12px;min-height:250px;transition:background .15s}
.door:hover{background:#101017}
.door .ix{font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--dim)}
.door h3{font-size:18px;font-weight:500;letter-spacing:-.01em}
.door p{font-size:13.5px;color:var(--ash);line-height:1.65}
.door .go{margin-top:auto;font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--dim);transition:color .15s}
.door .go::after{content:" →"}
.door:hover .go{color:var(--uv)}
@media(max-width:720px){.doors{grid-template-columns:1fr}.door{min-height:0}}

/* closing claim */
.claim h2{font-size:clamp(30px,5vw,46px);letter-spacing:-.03em;max-width:22ch;line-height:1.1}

/* footer */
footer{border-top:1px solid var(--line);padding:52px 0 72px;display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;font-size:12.5px;color:var(--ash)}
footer .name{font-size:15px;color:var(--bone);letter-spacing:-.02em}
footer .mono{font-family:var(--mono);font-size:11px;color:var(--dim);margin-top:8px}
footer a:hover{color:var(--bone)}
footer .mail img{display:block;width:178px;height:auto;margin-top:10px;opacity:.9}