:root{
  --jet:#111111;
  --white:#FFFFFF;
  --surface:#F6F6F5;
  --line:#E9E9E7;
  --muted:#626262;
  --dim:#8B8B8B;
  --gold:#FFD700;
  --plus:#4D4D4D;
  --danger:#B4302A;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --max:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  color:var(--jet);
  background:var(--white);
  font-family:var(--sans);
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
button,input,textarea{font:inherit}
img{max-width:100%;display:block}
:focus-visible{outline:2.5px solid var(--jet);outline-offset:3px;border-radius:8px}

.wrap{width:min(var(--max),calc(100% - 36px));margin:0 auto}
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(0,0,0,.055);
}
.header-inner{
  min-height:72px;
  display:flex;
  align-items:center;
  gap:22px;
}
.stack-logo{
  display:inline-flex;
  flex-direction:column;
  align-items:flex-start;
  justify-content:center;
  line-height:.82;
  font-size:21px;
  font-weight:820;
  letter-spacing:-.055em;
  flex:none;
}
.stack-logo span{display:block}
.stack-logo i{font-style:normal;color:var(--plus)}
.nav{
  margin-left:auto;
  display:flex;
  align-items:center;
  gap:7px;
}
.nav a{
  padding:9px 11px;
  border-radius:10px;
  color:#474747;
  font-size:13px;
  font-weight:640;
}
.nav a:hover{background:var(--surface);color:var(--jet)}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:11px 18px;
  border:1.5px solid var(--jet);
  border-radius:999px;
  background:var(--jet);
  color:#fff;
  font-weight:760;
  font-size:13px;
  cursor:pointer;
  transition:transform .12s ease,background .12s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn.yellow{background:var(--gold);color:var(--jet);border-color:var(--gold)}
.btn.ghost{background:#fff;color:var(--jet);border-color:#D7D7D4}
.btn.sm{min-height:38px;padding:9px 14px}
.mobile-toggle{display:none;margin-left:auto;border:0;background:transparent;width:42px;height:42px;border-radius:10px;font-size:23px}

.hero{
  padding:86px 0 74px;
}
.hero-grid{
  display:grid;
  grid-template-columns:minmax(0,1.25fr) minmax(300px,.75fr);
  gap:70px;
  align-items:center;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:11px;
  font-weight:800;
  text-transform:uppercase;
  letter-spacing:.09em;
  color:#4E4E4E;
  margin-bottom:18px;
}
.eyebrow:before{
  content:"";
  width:9px;height:9px;border-radius:50%;
  background:var(--gold);
  box-shadow:0 0 0 4px rgba(255,215,0,.18);
}
h1{
  margin:0;
  max-width:780px;
  font-size:clamp(46px,7vw,78px);
  line-height:.96;
  letter-spacing:-.064em;
  font-weight:835;
}
.hero-copy{
  max-width:620px;
  margin:24px 0 0;
  color:var(--muted);
  font-size:18px;
  line-height:1.55;
}
.hero-actions{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
  margin-top:30px;
}
.hero-note{
  font-size:11.5px;
  color:var(--dim);
  margin-top:13px;
}
.hero-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:24px;
  padding:24px;
}
.hero-card-label{
  font-size:11px;
  color:var(--dim);
  text-transform:uppercase;
  letter-spacing:.08em;
  font-weight:780;
}
.stuck-list{
  display:grid;
  gap:10px;
  margin-top:15px;
}
.stuck-item{
  display:flex;
  align-items:center;
  gap:11px;
  background:#fff;
  border:1px solid var(--line);
  border-radius:14px;
  padding:13px 14px;
  font-size:13.5px;
  font-weight:690;
}
.stuck-item b{
  width:26px;height:26px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:var(--gold);
  font-size:12px;
}
.hero-card-bottom{
  margin-top:16px;
  font-size:13px;
  line-height:1.5;
  color:var(--muted);
}

.section{padding:76px 0;border-top:1px solid var(--line)}
.section.soft{background:var(--surface)}
.section-head{max-width:720px;margin-bottom:34px}
.kicker{font-size:11px;text-transform:uppercase;letter-spacing:.09em;font-weight:800;color:var(--dim);margin-bottom:9px}
h2{
  font-size:clamp(30px,4.7vw,50px);
  line-height:1.02;
  letter-spacing:-.05em;
  margin:0;
}
.section-head p{
  color:var(--muted);
  font-size:16px;
  line-height:1.55;
  margin:14px 0 0;
}

.three{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:12px;
}
.simple-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:18px;
  padding:21px;
}
.simple-card .num{
  display:inline-flex;
  width:29px;height:29px;
  align-items:center;justify-content:center;
  border-radius:50%;
  background:var(--gold);
  font-size:12px;
  font-weight:840;
  margin-bottom:26px;
}
.simple-card h3{margin:0;font-size:17px;letter-spacing:-.02em}
.simple-card p{margin:8px 0 0;color:var(--muted);font-size:13.5px;line-height:1.55}

.project-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:10px;
}
.project{
  padding:17px 18px;
  border-bottom:1px solid var(--line);
  display:flex;
  align-items:flex-start;
  gap:12px;
}
.project-dot{
  width:8px;height:8px;background:var(--gold);border-radius:50%;
  flex:none;margin-top:6px;
}
.project strong{font-size:14px;display:block}
.project span{font-size:12.5px;line-height:1.45;color:var(--muted);display:block;margin-top:3px}

.promise{
  background:var(--jet);
  color:#fff;
  border-radius:26px;
  padding:38px;
  display:grid;
  grid-template-columns:1fr auto;
  gap:36px;
  align-items:center;
}
.promise h2{font-size:clamp(30px,4vw,48px)}
.promise p{color:#CFCFCF;max-width:640px;line-height:1.55;margin:13px 0 0;font-size:15px}

.network-block{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:46px;
  align-items:center;
}
.network-demo{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:22px;
  padding:18px;
}
.network-post{
  background:#fff;
  border:1px solid var(--line);
  border-radius:15px;
  padding:14px;
  margin-bottom:9px;
}
.network-post:last-child{margin-bottom:0}
.network-name{font-size:12.5px;font-weight:800}
.network-meta{font-size:10.5px;color:var(--dim);margin-top:2px}
.network-copy{font-size:12.5px;line-height:1.48;margin-top:9px}
.network-chip{
  display:inline-flex;
  margin-top:10px;
  background:var(--gold);
  border-radius:999px;
  padding:5px 8px;
  font-size:9.5px;
  font-weight:800;
  text-transform:uppercase;
  letter-spacing:.05em;
}

.contact-grid{
  display:grid;
  grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);
  gap:54px;
  align-items:start;
}
.contact-copy p{font-size:15px;line-height:1.6;color:var(--muted)}
.contact-check{
  display:flex;gap:10px;margin-top:14px;
  font-size:13px;color:#444;line-height:1.45;
}
.contact-check b{
  width:22px;height:22px;border-radius:50%;background:var(--gold);flex:none;
  display:flex;align-items:center;justify-content:center;font-size:11px;
}
.form-card{
  border:1px solid var(--line);
  border-radius:20px;
  padding:22px;
  background:#fff;
}
.field{margin-bottom:14px}
.field label{
  display:block;
  font-size:11px;
  font-weight:760;
  margin-bottom:6px;
  color:#454545;
}
.field input,.field textarea,.field select{
  width:100%;
  border:1px solid #DADADA;
  border-radius:11px;
  background:#fff;
  color:var(--jet);
  padding:12px 13px;
  font-size:14px;
}
.field textarea{min-height:130px;resize:vertical}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--jet)}
.form-note{font-size:10.5px;line-height:1.45;color:var(--dim);margin-top:10px}
.honeypot{position:absolute!important;left:-9999px!important;opacity:0!important;pointer-events:none!important}

.site-footer{
  border-top:1px solid var(--line);
  padding:34px 0 28px;
}
.footer-top{
  display:grid;
  grid-template-columns:1fr auto;
  gap:24px;
  align-items:start;
}
.footer-brand p{
  color:var(--muted);
  max-width:520px;
  font-size:12px;
  line-height:1.55;
  margin:12px 0 0;
}
.footer-links{
  display:flex;
  flex-wrap:wrap;
  justify-content:flex-end;
  gap:7px 14px;
}
.footer-links a{font-size:12px;color:#555;text-decoration:underline;text-underline-offset:3px}
.legal-note{
  border-top:1px solid var(--line);
  margin-top:25px;
  padding-top:18px;
  color:var(--dim);
  font-size:10.5px;
  line-height:1.55;
}
.footer-bottom{
  margin-top:14px;
  font-size:10.5px;
  color:var(--dim);
}

.legal-page{padding:52px 0 78px}
.legal-page article{max-width:820px}
.legal-page h1{font-size:clamp(40px,6vw,62px)}
.legal-meta{font-size:12px;color:var(--dim);margin:12px 0 32px}
.legal-page h2{font-size:21px;margin:31px 0 10px;letter-spacing:-.025em}
.legal-page p,.legal-page li{font-size:14px;line-height:1.65;color:#333}
.legal-page ul{padding-left:20px}
.legal-callout{background:var(--surface);border-radius:14px;padding:14px 15px}

.success-box{
  max-width:620px;
  margin:80px auto;
  padding:36px;
  border:1px solid var(--line);
  border-radius:22px;
  text-align:center;
}

@media(max-width:820px){
  .hero{padding:58px 0 54px}
  .hero-grid,.network-block,.contact-grid{grid-template-columns:1fr;gap:34px}
  .hero-card{max-width:620px}
  .three{grid-template-columns:1fr}
  .project-grid{grid-template-columns:1fr}
  .promise{grid-template-columns:1fr;padding:28px}
  .footer-top{grid-template-columns:1fr}
  .footer-links{justify-content:flex-start}
  .nav{
    display:none;
    position:absolute;
    left:18px;right:18px;top:72px;
    padding:10px;
    flex-direction:column;
    align-items:stretch;
    background:#fff;
    border:1px solid var(--line);
    border-radius:15px;
    box-shadow:0 18px 45px rgba(0,0,0,.1);
  }
  .nav.open{display:flex}
  .nav a{text-align:center}
  .mobile-toggle{display:block}
}
@media(max-width:520px){
  .wrap{width:min(100% - 28px,var(--max))}
  .header-inner{min-height:66px}
  .hero-copy{font-size:16px}
  .hero-actions .btn{width:100%}
  .section{padding:58px 0}
  .promise{border-radius:20px}
}