:root{
  --ink-900:#132A42;
  --ink-700:#2A4155;
  --ink-500:#526376;
  --paper:#F2F5F7;
  --paper-alt:#E7EDF1;
  --footer-bg:#DCE5EB;
  --white:#FFFFFF;
  --line:#C7D3DA;
  --line-strong:#9FB0BA;
  --grid:#D7E1E8;
  --blue-mid:#3A6EA0;
  --blue-dim:#DCE7F0;
  --amber:#B5761B;
  --amber-dim:#F1DFC0;
  --on-dark:#E9EEF2;
  --on-dark-dim:#A9BAC8;
  --radius:2px;
  --max:1180px;
  --display:"Space Grotesk", "IBM Plex Sans", sans-serif;
  --sans:"IBM Plex Sans", "Segoe UI", sans-serif;
  --mono:"IBM Plex Mono", ui-monospace, monospace;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:0.01ms !important; animation-iteration-count:1 !important; transition-duration:0.01ms !important;}
}

body{
  margin:0;
  background-color:var(--paper);
  color:var(--ink-700);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3{
  font-family:var(--display);
  color:var(--ink-900);
  margin:0;
  font-weight:600;
  letter-spacing:-0.01em;
}

a{color:inherit;}
img{max-width:100%;display:block;}
.sr-only{position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap;}

.wrap{max-width:var(--max); margin:0 auto; padding:0 28px; position:relative; z-index:1;}

.letterhead-bar{height:5px; background:linear-gradient(90deg, var(--blue-mid) 0%, var(--blue-mid) 60%, var(--amber) 60%, var(--amber) 100%);}

.eyebrow{
  font-family:var(--mono); font-size:12.5px; letter-spacing:0.12em; text-transform:uppercase;
  color:var(--blue-mid); display:flex; align-items:center; gap:10px; margin-bottom:18px;
}
.eyebrow::before{content:""; width:22px; height:1px; background:var(--blue-mid); display:inline-block;}

mark{background:linear-gradient(to bottom, transparent 62%, var(--amber-dim) 62%); color:var(--ink-900); padding:0 2px;}

.btn{
  display:inline-flex; align-items:center; gap:8px; font-family:var(--mono); font-size:14px; letter-spacing:0.02em;
  padding:14px 22px; border:1px solid var(--ink-900); border-radius:var(--radius);
  background:var(--ink-900); color:var(--on-dark); text-decoration:none; cursor:pointer;
  transition:background 0.15s ease, color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow:3px 4px 0 rgba(19,42,66,0.16);
}
.btn:hover{background:var(--blue-mid); border-color:var(--blue-mid); transform:translate(-1px,-1px); box-shadow:4px 5px 0 rgba(58,110,160,0.25);}
.btn:active{transform:translate(0,0); box-shadow:2px 2px 0 rgba(19,42,66,0.2);}
.btn:focus-visible{outline:2px solid var(--amber); outline-offset:3px;}

/* ---------- HEADER ---------- */
header{position:sticky; top:0; z-index:50; background:rgba(242,245,247,0.92); backdrop-filter:blur(6px); border-bottom:1px solid var(--line);}
.nav{display:flex; align-items:center; justify-content:space-between; padding:6px 28px; max-width:var(--max); margin:0 auto;}
.brand{display:flex; align-items:center; gap:11px; text-decoration:none; color:var(--ink-900);}
.brand-mark{display:block; flex-shrink:0;}
.brand-text{display:flex; flex-direction:column;}
.brand-name{font-family:var(--display); font-size:19px; font-weight:700; letter-spacing:0.01em;}
.brand-tag{font-family:var(--mono); font-size:10.5px; letter-spacing:0.08em; color:var(--blue-mid); text-transform:uppercase;}
.nav-links{display:flex; align-items:center; gap:30px; list-style:none; margin:0; padding:0;}
.nav-links a{font-family:var(--mono); font-size:13.5px; text-decoration:none; color:var(--ink-700); letter-spacing:0.02em; border-bottom:1px solid transparent; padding-bottom:2px; transition:border-color 0.15s ease, color 0.15s ease;}
.nav-links a:hover{border-color:var(--blue-mid); color:var(--ink-900);}
.nav-right{display:flex; align-items:center; gap:16px;}
.lang-switch select{font-family:var(--mono); font-size:12.5px; letter-spacing:0.05em; background:var(--white); border:1px solid var(--line-strong); border-radius:var(--radius); padding:7px 10px; color:var(--ink-700); cursor:pointer;}
.lang-switch select:focus-visible{outline:2px solid var(--amber); outline-offset:2px;}
.nav-cta{display:none;}
@media(min-width:860px){.nav-cta{display:inline-flex;}}
@media(max-width:859px){.nav-links{display:none;}}

/* ---------- HERO ---------- */
.hero{padding:72px 0 64px; border-bottom:1px solid var(--line); position:relative; overflow:hidden;}
.hero-grid{display:grid; grid-template-columns:1.05fr 0.95fr; gap:64px; align-items:center;}
@media(max-width:920px){.hero-grid{grid-template-columns:1fr; gap:60px;}}
.hero h1{font-size:clamp(32px, 4.4vw, 50px); line-height:1.14; font-weight:700;}
.hero-sub{margin-top:22px; font-size:17.5px; color:var(--ink-500); max-width:52ch; line-height:1.65;}
.hero-actions{display:flex; align-items:center; gap:18px; flex-wrap:wrap; margin-top:34px;}
.link-inline{font-family:var(--mono); font-size:13.5px; text-decoration:none; color:var(--ink-700); border-bottom:1px solid var(--line-strong); padding-bottom:2px;}
.link-inline:hover{color:var(--blue-mid); border-color:var(--blue-mid);}
.trust-line{margin-top:40px; font-family:var(--mono); font-size:12.5px; color:var(--ink-500); letter-spacing:0.01em; border-top:1px solid var(--line); padding-top:16px;}

/* ---------- TITLE BLOCK + CROP MARKS (signature elements) ---------- */
.diagram-wrap{position:relative;}
.title-block{
  position:absolute; top:-38px; right:0; z-index:2;
  border:1.5px solid var(--ink-900); background:var(--white);
  font-family:var(--mono); font-size:10px; letter-spacing:0.04em; color:var(--ink-700);
  min-width:170px;
}
.tb-row{padding:6px 10px; border-top:1px solid var(--line); display:flex; align-items:center; gap:6px;}
.tb-row:first-child{border-top:none;}
.tb-check{color:var(--ink-900); font-weight:600;}

.crop-mark{position:absolute; width:14px; height:14px; z-index:2; pointer-events:none;}
.crop-mark::before, .crop-mark::after{content:""; position:absolute; background:var(--line-strong);}
.crop-mark::before{width:14px; height:1.4px; top:6px; left:0;}
.crop-mark::after{width:1.4px; height:14px; left:6px; top:0;}
.cm-tl{top:-7px; left:-7px;}
.cm-tr{top:-7px; right:-7px;}
.cm-bl{bottom:-7px; left:-7px;}
.cm-br{bottom:-7px; right:-7px;}

/* ---------- DIAGRAM CARD ---------- */
.diagram-card{
  background:var(--white); border:1.5px solid var(--ink-900); border-radius:var(--radius);
  padding:26px 24px 14px; position:relative;
  box-shadow:6px 8px 0 rgba(19,42,66,0.08);
}
.file-tab{
  position:absolute; top:-15px; left:26px; background:var(--ink-900); color:var(--on-dark);
  font-family:var(--mono); font-size:10.5px; letter-spacing:0.07em; padding:6px 13px;
}
.diagram-tabs{display:flex; gap:6px; margin-bottom:18px; margin-top:8px; flex-wrap:wrap;}
.diagram-tab{
  font-family:var(--mono); font-size:12px; letter-spacing:0.02em; padding:8px 12px;
  border:1px solid var(--line-strong); background:var(--paper); color:var(--ink-500);
  cursor:pointer; border-radius:var(--radius); transition:all 0.15s ease;
}
.diagram-tab:hover{border-color:var(--blue-mid); color:var(--ink-900);}
.diagram-tab.active{background:var(--ink-900); color:var(--on-dark); border-color:var(--ink-900);}
.diagram-tab:focus-visible{outline:2px solid var(--amber); outline-offset:2px;}
.diagram-svg-wrap{width:100%; border:1px solid var(--line); background:var(--paper);}
.diagram-caption{font-family:var(--mono); font-size:12px; color:var(--ink-500); padding:12px 2px 8px; border-top:1px solid var(--line); margin-top:8px; min-height:34px;}
.flow-path{transition:opacity 0.25s ease;}
.flow-hidden{opacity:0;}
.flow-visible{opacity:1;}
.flow-box text{font-family:var(--mono); font-size:11px; fill:var(--ink-700);}
.flow-label{font-family:var(--mono); font-size:9.5px; fill:var(--ink-500); letter-spacing:0.02em;}

/* ---------- SECTION SCAFFOLD ---------- */
section{padding:88px 0; position:relative; overflow:hidden;}
section + section{border-top:1px solid var(--line);}
section.tint-a{background:var(--paper-alt);}
.section-head{max-width:640px; margin-bottom:52px;}
.section-head h2{font-size:clamp(25px,2.8vw,34px); line-height:1.24; font-weight:700;}
.section-head p{margin-top:16px; color:var(--ink-500); font-size:16.5px;}

.wm{position:absolute; top:-14px; right:20px; font-family:var(--display); font-weight:700; font-size:clamp(110px,15vw,200px); color:var(--ink-900); opacity:0.035; line-height:1; user-select:none; z-index:0;}
.wm-dark{color:var(--on-dark); opacity:0.05;}

/* ---------- PROBLEM ---------- */
.problem-grid{display:grid; grid-template-columns:1fr 1fr; gap:1px; background:var(--line); border:1px solid var(--line);}
@media(max-width:760px){.problem-grid{grid-template-columns:1fr;}}
.problem-card{background:var(--white); padding:34px; transition:box-shadow 0.2s ease, transform 0.2s ease;}
.problem-card:hover{box-shadow:0 10px 24px rgba(19,42,66,0.08); transform:translateY(-2px); position:relative; z-index:2;}
.problem-card .tag{font-family:var(--mono); font-size:11px; text-transform:uppercase; letter-spacing:0.1em; color:var(--amber); margin-bottom:14px; display:block;}
.problem-card h3{font-size:19px; margin-bottom:12px; line-height:1.32; font-weight:600;}
.problem-card p{color:var(--ink-500); font-size:15.5px;}
.problem-note{
  margin-top:32px; padding:24px 28px; border-left:3px solid var(--blue-mid); background:var(--blue-dim);
  font-size:16px; color:var(--ink-900); font-family:var(--sans); font-style:normal; line-height:1.6;
  box-shadow:4px 5px 0 rgba(58,110,160,0.08);
}

/* ---------- ARCHITECTURES ---------- */
.arch-tablist{display:flex; gap:10px; margin-bottom:36px; flex-wrap:wrap; border-bottom:1px solid var(--line);}
.arch-tab{font-family:var(--mono); font-size:13.5px; padding:14px 4px; margin-right:26px; background:none; border:none; border-bottom:2px solid transparent; color:var(--ink-500); cursor:pointer; display:flex; flex-direction:column; align-items:flex-start; gap:4px;}
.arch-tab .num{font-size:11px; color:var(--amber); letter-spacing:0.08em;}
.arch-tab.active{color:var(--ink-900); border-color:var(--blue-mid);}
.arch-tab:focus-visible{outline:2px solid var(--amber); outline-offset:3px;}
.arch-panel{display:none;}
.arch-panel.active{display:grid; grid-template-columns:1fr 1fr; gap:48px; align-items:start;}
@media(max-width:820px){.arch-panel.active{grid-template-columns:1fr; gap:28px;}}
.arch-copy h3{font-size:23px; margin-bottom:14px; font-weight:700;}
.arch-copy > p{color:var(--ink-500); margin-bottom:26px; font-size:16px;}
.arch-list{list-style:none; margin:0 0 22px; padding:0;}
.arch-list li{padding:12px 0; border-top:1px solid var(--line); font-size:15px; color:var(--ink-700);}
.arch-list li:last-child{border-bottom:1px solid var(--line);}
.arch-list .k{font-family:var(--mono); font-size:11px; color:var(--blue-mid); text-transform:uppercase; letter-spacing:0.08em; display:block; margin-bottom:5px;}
.arch-caution{font-size:14px; color:var(--ink-500); background:var(--amber-dim); border-left:3px solid var(--amber); padding:14px 18px; margin-top:6px;}
.arch-caution .k{color:var(--amber); font-family:var(--mono); font-size:11px; text-transform:uppercase; letter-spacing:0.08em; display:block; margin-bottom:6px;}

/* ---------- SECTORS ---------- */
.sector-grid{display:grid; grid-template-columns:1fr 1fr; gap:28px;}
@media(max-width:760px){.sector-grid{grid-template-columns:1fr;}}
.sector-card{border:1px solid var(--line); background:var(--white); padding:36px; transition:box-shadow 0.2s ease, transform 0.2s ease;}
.sector-card:hover{box-shadow:0 12px 26px rgba(19,42,66,0.09); transform:translateY(-3px);}
.sector-card h3{font-size:21px; margin-bottom:6px; font-weight:600;}
.sector-card .sub{font-family:var(--mono); font-size:11.5px; color:var(--blue-mid); text-transform:uppercase; letter-spacing:0.08em;}
.sector-list{list-style:none; margin:22px 0 0; padding:0;}
.sector-list li{padding:10px 0 10px 20px; position:relative; font-size:15px; color:var(--ink-700); border-top:1px solid var(--line);}
.sector-list li::before{content:"—"; position:absolute; left:0; color:var(--amber);}
.sector-similar{margin-top:38px; border:1px dashed var(--line-strong); padding:22px 26px; background:var(--white);}
.sector-similar-label{font-family:var(--mono); font-size:11px; text-transform:uppercase; letter-spacing:0.08em; color:var(--blue-mid); display:block; margin-bottom:14px;}
.sector-similar-list{list-style:none; margin:0; padding:0; display:grid; grid-template-columns:1fr 1fr; gap:10px 24px;}
@media(max-width:560px){.sector-similar-list{grid-template-columns:1fr;}}
.sector-similar-list li{font-size:14.5px; color:var(--ink-700); padding-left:16px; position:relative;}
.sector-similar-list li::before{content:"+"; position:absolute; left:0; color:var(--amber); font-family:var(--mono);}
.sector-disclaimer{margin-top:24px; font-size:13.5px; color:var(--ink-500); font-family:var(--mono); line-height:1.6;}

/* ---------- PROCESS ---------- */
.process-list{list-style:none; margin:0; padding:0;}
.process-item{display:grid; grid-template-columns:90px 1fr; gap:24px; padding:28px 0; border-top:1px solid var(--line); transition:padding-left 0.2s ease;}
.process-item:hover{padding-left:6px;}
.process-item:last-child{border-bottom:1px solid var(--line);}
.process-num{font-family:var(--mono); font-size:13px; color:var(--amber); padding-top:3px;}
.process-item h3{font-size:18px; margin-bottom:8px; font-weight:600;}
.process-item p{color:var(--ink-500); font-size:15px; margin:0;}
@media(max-width:600px){.process-item{grid-template-columns:1fr; gap:8px;}}

/* ---------- WHY ---------- */
.why{background:var(--ink-900); color:var(--on-dark);}
.why .eyebrow{color:var(--amber);}
.why .eyebrow::before{background:var(--amber);}
.why h2{color:var(--on-dark); font-weight:700;}
.why-grid{display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:start;}
@media(max-width:820px){.why-grid{grid-template-columns:1fr; gap:36px;}}
.why-copy p{color:var(--on-dark-dim); font-size:16px; line-height:1.7; margin-top:16px;}
.why-stats{display:grid; grid-template-columns:1fr 1fr; gap:1px; background:rgba(233,238,242,0.15);}
.stat{padding:28px 20px; background:var(--ink-900); transition:background 0.2s ease;}
.stat:hover{background:#1b3852;}
.stat .n{font-family:var(--display); font-size:33px; color:var(--on-dark); font-weight:700;}
.stat .l{font-family:var(--mono); font-size:11.5px; color:var(--on-dark-dim); text-transform:uppercase; letter-spacing:0.05em; margin-top:8px; line-height:1.5;}
.why-link{display:inline-block; margin-top:26px; font-family:var(--mono); font-size:13px; color:var(--on-dark); border-bottom:1px solid rgba(233,238,242,0.4); padding-bottom:2px; text-decoration:none;}
.why-link:hover{border-color:var(--amber); color:var(--amber);}

/* ---------- CONTACT ---------- */
.contact-grid{display:grid; grid-template-columns:0.9fr 1.1fr; gap:56px;}
@media(max-width:860px){.contact-grid{grid-template-columns:1fr; gap:36px;}}
.contact-info p{color:var(--ink-500); font-size:16px; margin-top:16px; max-width:40ch;}
.contact-meta{margin-top:32px; font-family:var(--mono); font-size:13.5px; color:var(--ink-700); line-height:2;}
.contact-meta a{color:var(--blue-mid); text-decoration:none;}
.contact-meta a:hover{text-decoration:underline;}

form{display:flex; flex-direction:column; gap:18px; background:var(--white); padding:32px; border:1px solid var(--line); box-shadow:6px 8px 0 rgba(19,42,66,0.05);}
.form-row{display:grid; grid-template-columns:1fr 1fr; gap:18px;}
@media(max-width:560px){.form-row{grid-template-columns:1fr;}}
label{font-family:var(--mono); font-size:12px; text-transform:uppercase; letter-spacing:0.06em; color:var(--ink-500); margin-bottom:7px; display:block;}
input, select, textarea{width:100%; font-family:var(--sans); font-size:15px; color:var(--ink-900); background:var(--paper); border:1px solid var(--line-strong); border-radius:var(--radius); padding:12px 14px;}
input:focus, select:focus, textarea:focus{outline:2px solid var(--blue-mid); outline-offset:1px; border-color:var(--blue-mid);}
textarea{resize:vertical; min-height:100px;}
.form-submit{margin-top:8px; align-self:flex-start;}
.form-note{font-family:var(--mono); font-size:12px; color:var(--ink-500); margin-top:4px;}
.form-success{display:none; padding:16px 18px; background:var(--blue-dim); border-left:3px solid var(--blue-mid); font-size:14.5px; color:var(--ink-900); margin-top:6px;}
.form-success.show{display:block;}

/* ---------- FOOTER ---------- */
footer{padding:48px 0 36px; background:var(--footer-bg); border-top:1px solid var(--line);}
.footer-grid{display:flex; justify-content:space-between; align-items:flex-end; flex-wrap:wrap; gap:24px;}
.footer-brand{display:flex; align-items:center; gap:9px; font-family:var(--display); font-size:17px; font-weight:700; color:var(--ink-900);}
.footer-sub{font-family:var(--mono); font-size:12.5px; color:var(--ink-500); margin-top:8px; max-width:42ch;}
.footer-links{display:flex; gap:22px; flex-wrap:wrap; list-style:none; margin:0; padding:0;}
.footer-links a{font-family:var(--mono); font-size:12.5px; color:var(--ink-500); text-decoration:none;}
.footer-links a:hover{color:var(--blue-mid);}
.footer-copy{font-family:var(--mono); font-size:11.5px; color:var(--line-strong); margin-top:28px;}

.reveal{opacity:0; transform:translateY(14px); transition:opacity 0.6s ease, transform 0.6s ease;}
.reveal.in{opacity:1; transform:translateY(0);}