:root{
  --ink:#14181C;
  --paper:#F6F7F6;
  --panel:#EDF0EF;
  --line:#D8DEDC;
  --magenta:#C81E5C;
  --magenta-soft:#F4D9E3;
  --teal:#163C4E;
  --teal-soft:#E4EDF0;
  --muted:#5B6570;
  --white:#FFFFFF;
  --radius:2px;
}
*{box-sizing:border-box; margin:0; padding:0;}
html{scroll-behavior:smooth;}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:'IBM Plex Sans', -apple-system, sans-serif;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit; text-decoration:none;}
img{max-width:100%; display:block;}
.wrap{max-width:1120px; margin:0 auto; padding:0 28px;}
h1,h2,h3{font-family:'Fraunces', serif; font-weight:600; letter-spacing:-0.01em; color:var(--ink);}

/* ---------- utility: test-line motif ---------- */
.strip-row{display:flex; align-items:center; gap:10px;}
.strip-mark{width:5px; height:22px; background:var(--panel); border-radius:1px; flex:none;}
.strip-mark.on{background:var(--magenta);}
.strip-mark.control{background:var(--teal);}

/* ---------- nav ---------- */
header{
  position:sticky; top:0; z-index:50;
  background:rgba(246,247,246,0.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
nav{display:flex; align-items:center; justify-content:space-between; padding:18px 0;}
.logo{display:flex; align-items:center; gap:12px; font-family:'Fraunces', serif; font-weight:600; font-size:19px;}
.logo .mark{display:flex; gap:3px;}
.logo .mark span{width:4px; height:16px; border-radius:1px; background:var(--line);}
.logo .mark span:nth-child(2){background:var(--teal);}
.logo .mark span:nth-child(4){background:var(--magenta);}
.navlinks{display:flex; gap:36px; font-size:14.5px; color:var(--muted);}
.navlinks a:hover, .navlinks a.active{color:var(--ink);}
.navlinks a.active{border-bottom:2px solid var(--magenta); padding-bottom:4px;}
.nav-cta{background:var(--ink); color:var(--paper); padding:9px 20px; font-size:14px; border-radius:2px;}
.nav-cta:hover{background:var(--teal);}

/* ---------- hero (homepage) ---------- */
.hero{padding:96px 0 76px; border-bottom:1px solid var(--line);}
.hero-grid{display:grid; grid-template-columns:1.15fr 0.85fr; gap:64px; align-items:end;}
.eyebrow{
  font-family:'IBM Plex Mono', monospace; font-size:12.5px; letter-spacing:0.14em;
  color:var(--magenta); text-transform:uppercase; margin-bottom:22px;
  display:flex; align-items:center; gap:10px;
}
.eyebrow::before{content:''; width:26px; height:1px; background:var(--magenta);}
.hero h1{font-size:clamp(34px, 4.6vw, 54px); line-height:1.18; margin-bottom:24px;}
.hero h1 em{font-style:normal; color:var(--teal);}
.hero p.lede{font-size:17px; color:var(--muted); max-width:46ch; margin-bottom:34px;}
.hero-actions{display:flex; gap:14px; flex-wrap:wrap;}
.btn{display:inline-block; padding:13px 26px; font-size:14.5px; border-radius:2px; border:1px solid var(--ink); cursor:pointer;}
.btn-primary{background:var(--ink); color:var(--paper);}
.btn-primary:hover{background:var(--teal); border-color:var(--teal);}
.btn-ghost{border-color:var(--line); color:var(--ink);}
.btn-ghost:hover{border-color:var(--ink);}

/* cassette read-window visual */
.cassette{background:var(--white); border:1px solid var(--line); border-radius:4px; padding:26px 24px;}
.cassette-label{
  font-family:'IBM Plex Mono', monospace; font-size:11.5px; color:var(--muted);
  letter-spacing:0.08em; margin-bottom:16px; display:flex; justify-content:space-between;
}
.window{background:var(--panel); border-radius:3px; padding:20px 18px; display:flex; flex-direction:column; gap:12px;}
.window-row{display:flex; align-items:center; gap:14px;}
.window-row .tag{font-family:'IBM Plex Mono', monospace; font-size:11px; color:var(--muted); width:28px; flex:none;}
.window-row .bar{height:8px; border-radius:2px; background:var(--line); flex:1;}
.window-row.control .bar{background:var(--teal);}
.window-row.result .bar{background:var(--magenta); width:100%;}
.window-note{font-size:12px; color:var(--muted); margin-top:16px; line-height:1.6;}

/* ---------- section shared ---------- */
section{padding:80px 0;}
.section-head{max-width:640px; margin-bottom:48px;}
.section-head .eyebrow{margin-bottom:16px;}
.section-head h2{font-size:clamp(26px,3vw,34px); margin-bottom:14px;}
.section-head p{color:var(--muted); font-size:15.5px;}

/* ---------- sub-page header (about/product/faq/contact) ---------- */
.page-header{padding:56px 0 44px; border-bottom:1px solid var(--line); background:var(--white);}
.breadcrumb{font-size:12.5px; color:var(--muted); margin-bottom:18px; font-family:'IBM Plex Mono', monospace;}
.breadcrumb a:hover{color:var(--teal);}
.page-header h1{font-size:clamp(28px,3.6vw,42px); margin-bottom:14px;}
.page-header p.lede{color:var(--muted); font-size:15.5px; max-width:56ch;}

/* about */
.about{background:var(--white); border-bottom:1px solid var(--line);}
.about-grid{display:grid; grid-template-columns:1fr 1fr; gap:56px;}
.about-grid p{color:var(--muted); font-size:15.5px; margin-bottom:16px;}
.stat-row{display:flex; gap:40px; margin-top:30px; flex-wrap:wrap;}
.stat b{display:block; font-family:'Fraunces',serif; font-size:28px; color:var(--teal);}
.stat span{font-size:12.5px; color:var(--muted);}

.service-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border:1px solid var(--line); margin-top:48px;}
.service-item{background:var(--white); padding:28px 24px;}
.service-item .idx{font-family:'IBM Plex Mono', monospace; font-size:11px; color:var(--magenta); margin-bottom:10px;}
.service-item h3{font-size:16px; margin-bottom:6px;}
.service-item p{font-size:13px; color:var(--muted);}

/* product */
.product{border-bottom:1px solid var(--line);}
.product-card{background:var(--white); border:1px solid var(--line); border-radius:4px; overflow:hidden;}
.product-top{display:grid; grid-template-columns:0.9fr 1.1fr;}
.product-visual{background:var(--teal); padding:40px; display:flex; flex-direction:column; justify-content:space-between; color:var(--teal-soft);}
.product-visual .strip-row{margin-bottom:24px;}
.product-visual h3{color:#fff; font-size:24px; margin-bottom:10px;}
.product-visual .code{font-family:'IBM Plex Mono', monospace; font-size:12px; opacity:0.75;}
.product-info{padding:40px;}
.product-info p{color:var(--muted); font-size:15px; margin-bottom:20px;}
table.spec{width:100%; border-collapse:collapse; font-size:14px;}
table.spec th{
  text-align:left; font-family:'IBM Plex Mono', monospace; font-size:11px;
  color:var(--muted); text-transform:uppercase; letter-spacing:0.06em;
  padding:8px 10px; border-bottom:1px solid var(--line);
}
table.spec td{padding:10px 10px; border-bottom:1px solid var(--panel);}
table.spec td.mono{font-family:'IBM Plex Mono', monospace; font-size:12.5px; color:var(--teal);}
.badge-note{
  margin-top:24px; padding:14px 16px; background:var(--magenta-soft); border-radius:3px;
  font-size:13px; color:#7A1440; display:flex; gap:10px;
}

/* process */
.process{background:var(--white); border-bottom:1px solid var(--line);}
.steps{display:grid; grid-template-columns:repeat(4,1fr); gap:1px; background:var(--line); border:1px solid var(--line);}
.step{background:var(--white); padding:32px 26px;}
.step .num{font-family:'IBM Plex Mono', monospace; font-size:12px; color:var(--magenta); margin-bottom:14px;}
.step h3{font-size:17px; margin-bottom:10px; font-weight:600;}
.step p{font-size:13.5px; color:var(--muted);}

/* compliance */
.compliance{border-bottom:1px solid var(--line);}
.compliance-box{background:var(--panel); border-radius:4px; padding:40px; display:grid; grid-template-columns:1fr 1fr; gap:40px;}
.compliance-box h3{font-size:17px; margin-bottom:10px;}
.compliance-box p{font-size:14px; color:var(--muted);}
.compliance-box .field{font-family:'IBM Plex Mono', monospace; font-size:12.5px; color:var(--teal); margin-top:6px;}

/* faq accordion */
.faq-list{border-top:1px solid var(--line);}
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%; text-align:left; background:none; border:none; cursor:pointer;
  padding:22px 4px; display:flex; justify-content:space-between; align-items:center;
  font-family:'Fraunces', serif; font-size:17px; font-weight:600; color:var(--ink);
}
.faq-q .plus{font-family:'IBM Plex Mono', monospace; color:var(--magenta); font-size:20px; flex:none; margin-left:20px;}
.faq-a{max-height:0; overflow:hidden; transition:max-height 0.25s ease;}
.faq-a p{color:var(--muted); font-size:14.5px; padding:0 4px 22px; max-width:64ch;}
.faq-item.open .faq-a{max-height:400px;}
.faq-item.open .plus{transform:rotate(45deg);}

/* contact page */
.contact-grid{display:grid; grid-template-columns:1fr 1fr; gap:56px;}
.info-list{list-style:none;}
.info-list li{display:flex; gap:16px; padding:16px 0; border-bottom:1px solid var(--line);}
.info-list li .k{width:110px; flex:none; font-family:'IBM Plex Mono', monospace; font-size:12px; color:var(--muted); padding-top:2px;}
.info-list li .v{font-size:15px;}
.info-list li .v.mono{font-family:'IBM Plex Mono', monospace; color:var(--teal);}
.form-box{background:var(--white); border:1px solid var(--line); border-radius:4px; padding:32px;}
.form-box label{display:block; font-size:13px; color:var(--muted); margin-bottom:6px; margin-top:16px;}
.form-box label:first-child{margin-top:0;}
.form-box input, .form-box textarea{
  width:100%; border:1px solid var(--line); border-radius:2px; padding:11px 12px;
  font-family:'IBM Plex Sans', sans-serif; font-size:14px; background:var(--paper);
}
.form-box textarea{min-height:100px; resize:vertical;}
.form-box .btn{margin-top:22px; width:100%; text-align:center;}

/* cta */
.cta{background:var(--ink); color:var(--paper);}
.cta-grid{display:grid; grid-template-columns:1.2fr 0.8fr; gap:56px; align-items:center;}
.cta h2{color:#fff; font-size:clamp(26px,3.2vw,36px); margin-bottom:16px;}
.cta p{color:#B8C0C6; font-size:15px; margin-bottom:28px; max-width:44ch;}
.cta .btn-primary{background:var(--magenta); border-color:var(--magenta);}
.cta .btn-primary:hover{background:#a91850; border-color:#a91850;}
.contact-card{background:#1E252B; border-radius:4px; padding:30px;}
.contact-card .row{display:flex; justify-content:space-between; padding:12px 0; border-bottom:1px solid #2B333A; font-size:13.5px;}
.contact-card .row:last-child{border-bottom:none;}
.contact-card .row span:first-child{color:#8B949C;}
.contact-card .row span:last-child{font-family:'IBM Plex Mono', monospace; text-align:right;}

footer{padding:36px 0; background:var(--ink); border-top:1px solid #2B333A;}
footer .wrap{display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px;}
footer .foot-links{display:flex; gap:20px; font-size:12.5px;}
footer .foot-links a{color:#9AA4AB;}
footer .foot-links a:hover{color:#fff;}
footer p{font-size:12.5px; color:#7C868D;}

@media (max-width: 860px){
  .hero-grid, .about-grid, .product-top, .cta-grid, .compliance-box, .contact-grid{grid-template-columns:1fr;}
  .steps{grid-template-columns:1fr 1fr;}
  .service-grid{grid-template-columns:1fr 1fr;}
  .navlinks{display:none;}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
}