/* DuBois.sg — palette taken from duboisgold.com: black, white, gold #BEA471, light gold #D7C8AC, grey #ECEDED */
:root{
  --bg:#0b0b0c; --bg2:#111113; --panel:#161618; --line:rgba(255,255,255,.09);
  --text:#f4f2ee; --muted:#a6a29a; --gold:#bea471; --gold-l:#d7c8ac; --gold-d:#8f7543; --grey:#ecedED;
  --radius:18px; --max:1200px;
  --font-head:"Plus Jakarta Sans","Noto Sans SC",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC",system-ui,sans-serif;
  --font-mono:"Fragment Mono",ui-monospace,Menlo,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden}
html[lang="zh-CN"] body{line-height:1.8}
a{color:inherit;text-decoration:none}
img,svg{display:block}
.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 24px}
h1,h2,h3{font-family:var(--font-head);font-weight:600;letter-spacing:-.02em;line-height:1.15}
h1{font-size:clamp(2.3rem,5vw,4rem)}
h2{font-size:clamp(1.8rem,3.4vw,2.75rem);margin-bottom:16px}
h3{font-size:1.15rem;margin-bottom:8px}
p{color:var(--muted)}
.gold{background:linear-gradient(100deg,var(--gold-l),var(--gold) 50%,var(--gold-d));-webkit-background-clip:text;background-clip:text;color:transparent}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 26px;border-radius:999px;font-family:var(--font-head);font-weight:600;font-size:.95rem;border:1px solid transparent;cursor:pointer;transition:.25s}
.btn--gold{background:linear-gradient(135deg,var(--gold-l),var(--gold) 55%,var(--gold-d));color:#111}
.btn--gold:hover{filter:brightness(1.08);transform:translateY(-1px);box-shadow:0 10px 30px rgba(190,164,113,.25)}
.btn--ghost{border-color:var(--line);color:var(--text)}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold-l)}
.btn--sm{padding:9px 18px;font-size:.85rem}

/* Brand wordmark */
.brand{display:inline-flex;align-items:center;gap:10px}
.brand__mark{width:30px;height:30px}
.brand__word{font-family:"Plus Jakarta Sans",sans-serif;font-weight:600;font-size:1.5rem;letter-spacing:-.01em;color:var(--gold)}
.brand__sub{font-family:"Plus Jakarta Sans",sans-serif;font-weight:600;font-size:.7rem;letter-spacing:.16em;color:var(--text);border:1px solid rgba(190,164,113,.5);border-radius:4px;padding:2px 5px;margin-left:-2px;align-self:center}

/* Nav */
.nav{position:fixed;inset:0 0 auto 0;z-index:50;transition:.3s;border-bottom:1px solid transparent}
.nav.is-scrolled{background:rgba(11,11,12,.82);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom-color:var(--line)}
.nav__inner{display:flex;align-items:center;justify-content:space-between;height:72px;gap:24px}
.nav__links{display:flex;align-items:center;gap:28px;font-size:.92rem}
.nav__links a:not(.btn){color:#d6d2ca;transition:.2s}
.nav__links a:not(.btn):hover{color:var(--gold-l)}
.nav__tools{display:flex;align-items:center;gap:12px}
.lang{background:none;border:1px solid var(--line);color:var(--muted);border-radius:999px;padding:7px 14px;font:500 .82rem var(--font-body);cursor:pointer;display:flex;gap:6px}
.lang span[data-lang].is-active{color:var(--gold-l)}
.lang__sep{opacity:.4}
.burger{display:none;background:none;border:0;width:40px;height:40px;cursor:pointer;position:relative}
.burger span{position:absolute;left:9px;right:9px;height:2px;background:var(--text);border-radius:2px;transition:.3s}
.burger span:nth-child(1){top:13px}.burger span:nth-child(2){top:19px}.burger span:nth-child(3){top:25px}
.burger[aria-expanded="true"] span:nth-child(1){top:19px;transform:rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){top:19px;transform:rotate(-45deg)}

/* Hero */
.hero{position:relative;padding:150px 0 100px;overflow:hidden}
.hero__glow{position:absolute;inset:-20% -10% auto auto;width:900px;height:900px;background:radial-gradient(circle,rgba(190,164,113,.22),transparent 60%);pointer-events:none}
.hero::after{content:"";position:absolute;inset:0;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:64px 64px;mask-image:radial-gradient(ellipse at 70% 30%,#000 10%,transparent 65%);-webkit-mask-image:radial-gradient(ellipse at 70% 30%,#000 10%,transparent 65%);opacity:.5;pointer-events:none}
.hero__inner{position:relative;z-index:1;display:grid;grid-template-columns:1.1fr 1fr;gap:56px;align-items:center}
.eyebrow,.kicker{font:500 .8rem var(--font-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--gold);margin-bottom:20px}
.lead{font-size:1.12rem;margin:24px 0 34px;max-width:560px}
.hero__actions{display:flex;flex-wrap:wrap;gap:14px}
.hero__tags{list-style:none;display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:40px;font-size:.88rem;color:var(--muted)}
.hero__tags li::before{content:"◆";color:var(--gold);font-size:.6rem;margin-right:8px;vertical-align:2px}
.hero__visual{position:relative;height:440px;perspective:1200px}
.card3d{position:absolute;width:360px;aspect-ratio:1.586;border-radius:20px;padding:24px;display:flex;flex-direction:column;justify-content:space-between;color:#1a1408;box-shadow:0 40px 80px rgba(0,0,0,.55),inset 0 1px 0 rgba(255,255,255,.4)}
.card3d--front{right:6%;top:150px;background:linear-gradient(135deg,#ead9b4 0%,#bea471 45%,#8a6f3e 100%);transform:rotateY(-14deg) rotateX(8deg) rotateZ(-6deg);animation:float 7s ease-in-out infinite}
.card3d--back{right:24%;top:40px;background:linear-gradient(135deg,#232326,#0f0f11);color:var(--gold-l);border:1px solid rgba(190,164,113,.35);transform:rotateY(-14deg) rotateX(8deg) rotateZ(-12deg);animation:float 7s ease-in-out -3.5s infinite}
@keyframes float{50%{translate:0 -12px}}
.card__top,.card__foot{display:flex;justify-content:space-between;align-items:center}
.card__logo{width:30px;height:30px}
.card--front .card__logo{filter:brightness(.4)}
.card3d--front .card__logo{filter:brightness(.35) saturate(0)}
.card__type{font:500 .7rem var(--font-mono);letter-spacing:.2em;opacity:.8}
.card__brand{font:700 1.25rem "Plus Jakarta Sans",sans-serif}
.card__brand small{font-size:.6rem;letter-spacing:.15em;margin-left:2px}
.card__chip{width:46px;height:34px;border-radius:7px;background:linear-gradient(135deg,#f3e6c6,#a88a52);border:1px solid rgba(0,0,0,.2)}
.card__chip--ghost{background:none;border:1px dashed rgba(190,164,113,.4)}
.card__num{font:1.15rem var(--font-mono);letter-spacing:.12em}
.card__foot{font:500 .68rem var(--font-mono);letter-spacing:.14em;opacity:.85}
.hero__float{position:absolute;display:flex;align-items:center;gap:10px;background:rgba(22,22,24,.85);backdrop-filter:blur(8px);border:1px solid var(--line);border-radius:12px;padding:10px 16px;font-size:.85rem;box-shadow:0 20px 40px rgba(0,0,0,.4)}
.hero__float--a{left:2%;top:300px}
.hero__float--b{right:0;top:10px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--gold)}
.dot--ok{background:#6fcf97;box-shadow:0 0 0 4px rgba(111,207,151,.15)}

/* Sections */
.section{padding:110px 0;position:relative}
.section--alt{background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section__head{max-width:720px;margin-bottom:56px}
.section__head p:not(.kicker){font-size:1.05rem}
.grid{display:grid;gap:20px}
.grid--2{grid-template-columns:repeat(2,1fr)}
.grid--3{grid-template-columns:repeat(3,1fr)}
.grid--4{grid-template-columns:repeat(4,1fr)}
.tile,.feature,.product{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:30px;transition:.3s}
.tile:hover,.feature:hover,.product:hover{border-color:rgba(190,164,113,.4);transform:translateY(-3px)}
.tile h3::before{content:"";display:block;width:28px;height:2px;background:var(--gold);margin-bottom:18px}

/* Flow diagram */
.flow{display:flex;align-items:center;justify-content:space-between;gap:0;margin-bottom:48px;padding:36px;border:1px solid var(--line);border-radius:24px;background:radial-gradient(ellipse at center,rgba(190,164,113,.08),transparent 70%)}
.flow__node{flex:0 0 auto;width:230px;text-align:center;padding:22px;border:1px solid var(--line);border-radius:16px;background:var(--panel);display:flex;flex-direction:column;align-items:center;gap:6px}
.flow__node strong{font-family:var(--font-head);font-weight:600}
.flow__node small{color:var(--muted);font-size:.82rem}
.flow__node--core{width:280px;border-color:rgba(190,164,113,.5);box-shadow:0 0 60px rgba(190,164,113,.12)}
.flow__ico{font-size:1.6rem;color:var(--gold);line-height:1}
.flow__mark{width:44px;height:44px;margin-bottom:4px}
.flow__line{flex:1;height:2px;min-width:30px;background:linear-gradient(90deg,transparent,var(--gold),transparent);position:relative;overflow:hidden}
.flow__line::after{content:"";position:absolute;top:-2px;left:-30%;width:30%;height:6px;background:var(--gold-l);border-radius:3px;filter:blur(2px);animation:pulse 2.6s linear infinite}
@keyframes pulse{to{left:100%}}

/* Products */
.product__art{height:190px;border-radius:14px;margin-bottom:26px;display:grid;place-items:center;border:1px solid var(--line);overflow:hidden}
.product__art--virtual{background:radial-gradient(circle at 30% 30%,rgba(190,164,113,.2),transparent 60%),#0f0f11}
.product__art--physical{background:radial-gradient(circle at 70% 60%,rgba(190,164,113,.25),transparent 60%),#0f0f11}
.mini-card{width:220px;aspect-ratio:1.586;border-radius:13px;padding:16px;display:flex;flex-direction:column;justify-content:space-between;box-shadow:0 20px 40px rgba(0,0,0,.5)}
.mini-card--v{background:linear-gradient(135deg,#242427,#101012);border:1px solid rgba(190,164,113,.4);color:var(--gold-l);font:.85rem var(--font-mono);transform:rotate(-6deg)}
.mini-card--v svg{width:26px;height:26px}
.mini-card--p{background:linear-gradient(135deg,#ead9b4,#bea471 50%,#8a6f3e);color:#1a1408;font:700 1rem "Plus Jakarta Sans";transform:rotate(5deg)}
.mini-card--p small{font-size:.55rem;letter-spacing:.15em}
.chip{display:block;width:34px;height:25px;border-radius:5px;background:linear-gradient(135deg,#f3e6c6,#a88a52);border:1px solid rgba(0,0,0,.2)}
.checks{list-style:none;margin-top:18px;display:grid;gap:10px}
.checks li{position:relative;padding-left:28px;color:#d6d2ca;font-size:.95rem}
.checks li::before{content:"";position:absolute;left:0;top:.45em;width:16px;height:16px;border-radius:50%;background:rgba(190,164,113,.15);border:1px solid var(--gold)}
.checks li::after{content:"";position:absolute;left:5px;top:calc(.45em + 4px);width:6px;height:4px;border-left:1.5px solid var(--gold-l);border-bottom:1.5px solid var(--gold-l);transform:rotate(-45deg)}
.usecases{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:40px}
.usecases__label{font:500 .78rem var(--font-mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-right:8px}
.pill{border:1px solid var(--line);border-radius:999px;padding:8px 16px;font-size:.88rem;color:#d6d2ca}

/* Features */
.feature__ico{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;font-size:1.3rem;color:var(--gold);background:rgba(190,164,113,.1);border:1px solid rgba(190,164,113,.3);margin-bottom:20px}

/* Steps */
.steps{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:s}
.step{position:relative;padding:30px 26px;border-top:2px solid var(--gold);background:linear-gradient(180deg,rgba(190,164,113,.07),transparent 70%);border-radius:0 0 var(--radius) var(--radius)}
.step__n{display:block;font:2.2rem var(--font-mono);color:var(--gold);margin-bottom:16px;opacity:.9}

/* Developers */
.split{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.split > div > p:not(.kicker){font-size:1.05rem}
.code{background:#0a0a0b;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 30px 60px rgba(0,0,0,.4);min-width:0}
.code__bar{display:flex;align-items:center;gap:7px;padding:14px 18px;border-bottom:1px solid var(--line);background:#121214}
.code__bar i{width:11px;height:11px;border-radius:50%;background:#333}
.code__bar i:first-child{background:var(--gold)}
.code__bar span{margin-left:12px;font:.8rem var(--font-mono);color:var(--muted)}
.code pre{padding:24px;overflow-x:auto;font:.86rem/1.7 var(--font-mono);color:#d6d2ca}
.code .c{color:#6d6a64}.code .k{color:var(--gold-l)}.code .s{color:#c9b27f}.code .p{color:#e8e4dc}

/* Security note */
.note{margin-top:32px;font-size:.88rem;padding:16px 20px;border-left:2px solid var(--gold);background:rgba(190,164,113,.05);border-radius:0 10px 10px 0;max-width:820px}

/* About */
.about .split{grid-template-columns:.8fr 1.2fr}
.about__mark{display:grid;place-items:center;aspect-ratio:1;max-width:380px;width:100%;margin:0 auto;border-radius:50%;background:radial-gradient(circle,rgba(190,164,113,.18),transparent 65%)}
.about__mark svg{width:58%;height:58%;animation:spin 40s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.about p:not(.kicker){margin-bottom:16px}
.link{color:var(--gold);font-weight:500;border-bottom:1px solid rgba(190,164,113,.4);padding-bottom:2px}
.link:hover{color:var(--gold-l)}

/* Contact */
.contact__email{margin-top:24px;color:#d6d2ca}
.contact__email a{color:var(--gold)}
.form{background:var(--panel);border:1px solid var(--line);border-radius:22px;padding:32px;display:grid;gap:16px}
.form__row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form label{display:grid;gap:7px;font-size:.85rem;color:var(--muted)}
.form input,.form select,.form textarea{width:100%;background:#0e0e10;border:1px solid var(--line);border-radius:10px;padding:12px 14px;color:var(--text);font:inherit;font-size:.95rem;transition:.2s}
.form input:focus,.form select:focus,.form textarea:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 3px rgba(190,164,113,.15)}
.form input.is-invalid{border-color:#e0241b}
.form textarea{resize:vertical}
.form__hint{font-size:.8rem}

/* Footer */
.footer{padding:64px 0 32px;border-top:1px solid var(--line)}
.footer__inner{display:flex;justify-content:space-between;align-items:flex-start;gap:32px;flex-wrap:wrap}
.footer__tag{margin-top:12px;font-size:.9rem}
.footer__links{display:flex;flex-wrap:wrap;gap:24px;font-size:.9rem;color:#d6d2ca}
.footer__links a:hover{color:var(--gold-l)}
.footer__bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:48px;padding-top:24px;border-top:1px solid var(--line);font-size:.82rem;color:var(--muted)}

/* Reveal */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .8s ease,transform .8s ease}
.reveal.is-visible{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.reveal{opacity:1;transform:none}html{scroll-behavior:auto}}

/* Responsive */
@media (max-width:1080px){
  .grid--4{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .nav__links{gap:20px}
}
@media (max-width:960px){
  .burger{display:block}
  .nav__links{position:fixed;top:72px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;padding:12px 24px 28px;background:rgba(11,11,12,.97);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);transform:translateY(-12px);opacity:0;pointer-events:none;transition:.3s}
  .nav__links.is-open{transform:none;opacity:1;pointer-events:auto}
  .nav__links a:not(.btn){padding:14px 0;border-bottom:1px solid var(--line);font-size:1rem}
  .nav__cta{margin-top:18px}
  .nav.menu-open{background:rgba(11,11,12,.97)}
  .hero__inner,.split,.about .split{grid-template-columns:1fr}
  .hero{padding:120px 0 70px}
  .hero__visual{height:380px;max-width:520px;width:100%;margin:0 auto}
  .grid--3{grid-template-columns:1fr 1fr}
  .flow{flex-direction:column;gap:0;padding:24px}
  .flow__node,.flow__node--core{width:100%;max-width:360px}
  .flow__line{width:2px;height:36px;flex:0 0 36px;min-width:0;background:linear-gradient(180deg,transparent,var(--gold),transparent)}
  .flow__line::after{display:none}
  .about__mark{max-width:240px}
  .split{gap:40px}
}
@media (max-width:640px){
  .container{padding:0 20px}
  .section{padding:80px 0}
  .grid--2,.grid--3,.grid--4,.steps,.form__row{grid-template-columns:1fr}
  .section__head{margin-bottom:40px}
  .hero__visual{height:300px}
  .card3d{width:250px;padding:16px;border-radius:14px}
  .card3d--front{right:2%;top:110px}
  .card3d--back{right:auto;left:0;top:30px}
  .card__num{font-size:.85rem}
  .card__chip{width:34px;height:25px}
  .card__brand{font-size:1rem}
  .card__logo{width:22px;height:22px}
  .hero__float--a{left:0;top:250px}
  .hero__float--b{right:0;top:0}
  .lang{padding:6px 11px}
  .brand__word{font-size:1.3rem}
  .tile,.feature,.product,.form{padding:24px}
  .product__art{height:160px}
  .mini-card{width:190px}
}
h1,h2{text-wrap:balance}
#contact .split{align-items:start}