/* =========================================================
   Nexinova — design tokens
   ========================================================= */
:root{
  --ink:#12161C;
  --ink-soft:#1B222B;
  --paper:#F5F3EE;
  --paper-dim:#EBE8E0;
  --steel:#24384A;
  --steel-soft:#3C5468;
  --copper:#B5541E;
  --copper-light:#E07A3F;
  --signal:#2FA39A;
  --mist:#6B7686;
  --line:rgba(18,22,28,0.12);
  --line-light:rgba(245,243,238,0.18);
  --radius:2px;
  --font-display:'Space Grotesk', 'Arial Narrow', sans-serif;
  --font-body:'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:'IBM Plex Mono', 'Courier New', monospace;
  --max:1180px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--steel);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;display:block;}
a{color:inherit;}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:600;
  line-height:1.08;
  margin:0 0 .5em;
  letter-spacing:-0.01em;
  color:var(--ink);
}
p{margin:0 0 1em;}
.container{max-width:var(--max);margin:0 auto;padding:0 32px;}
@media(max-width:640px){.container{padding:0 20px;}}

/* focus visibility */
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{
  outline:2px solid var(--copper);
  outline-offset:3px;
}
@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important;}
}

.eyebrow{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--copper);
  display:flex;
  align-items:center;
  gap:10px;
  margin-bottom:14px;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--copper);display:inline-block;}

/* =========================================================
   Header / nav
   ========================================================= */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(245,243,238,0.97);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;padding:16px 32px;max-width:var(--max);margin:0 auto;}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;}
.brand img{height:30px;width:auto;}
.brand-word{font-family:var(--font-display);font-weight:600;font-size:20px;color:var(--ink);letter-spacing:-0.01em;}
.nav-links{display:flex;gap:30px;list-style:none;margin:0;padding:0;font-family:var(--font-mono);font-size:13px;letter-spacing:.04em;}
.nav-links a{
  text-decoration:none;color:var(--steel);position:relative;padding:6px 0;
}
.nav-links a::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--copper);
  transform:scaleX(0);transform-origin:left;transition:transform .25s ease;
}
.nav-links a:hover::after,.nav-links a.active::after{transform:scaleX(1);}
.nav-cta{
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;
  border:1px solid var(--steel);padding:9px 18px;text-decoration:none;color:var(--steel);
  transition:background .2s ease,color .2s ease;
}
.nav-cta:hover{background:var(--steel);color:var(--paper);}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:6px;}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--ink);margin:5px 0;}
@media(max-width:860px){
  .nav-links{position:fixed;inset:64px 0 0 0;background:var(--paper);flex-direction:column;padding:30px 32px;gap:22px;transform:translateY(-110%);transition:transform .3s ease;font-size:16px;z-index:45;pointer-events:none;}
  .nav-links.open{transform:translateY(0);pointer-events:auto;}
  .nav-cta{display:none;}
  .nav-toggle{display:block;}
}

/* =========================================================
   Track line — signature motif
   ========================================================= */
.track-line{width:100%;height:auto;display:block;}
.track-divider{margin:0;padding:0;line-height:0;}

/* =========================================================
   Hero
   ========================================================= */
.hero{
  background:var(--ink);
  color:var(--paper);
  padding:120px 0 90px;
  position:relative;
  overflow:hidden;
}
.hero .container{position:relative;z-index:2;}
.hero-eyebrow{color:var(--copper-light);}
.hero-eyebrow::before{background:var(--copper-light);}
.hero h1{
  color:var(--paper);
  font-size:clamp(38px,6vw,72px);
  max-width:16ch;
  margin-bottom:26px;
}
.hero p.lead{
  max-width:56ch;
  color:#C7CDD4;
  font-size:18px;
  margin-bottom:36px;
}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;}
.btn{
  font-family:var(--font-mono);font-size:13px;letter-spacing:.05em;
  padding:14px 26px;text-decoration:none;display:inline-flex;align-items:center;gap:10px;
  border:1px solid transparent;transition:all .2s ease;
}
.btn-primary{background:var(--copper);color:#fff;}
.btn-primary:hover{background:var(--copper-light);}
.btn-outline{border-color:var(--line-light);color:var(--paper);}
.btn-outline:hover{background:var(--line-light);}
.btn-dark{border-color:var(--steel);color:var(--steel);}
.btn-dark:hover{background:var(--steel);color:var(--paper);}

/* =========================================================
   Sections
   ========================================================= */
section{padding:90px 0;}
.section-tight{padding:60px 0;}
.section-alt{background:var(--paper-dim);}
.section-dark{background:var(--ink);color:var(--paper);}
.section-dark h2,.section-dark h3,.section-dark h4{color:var(--paper);}
.section-head{max-width:640px;margin-bottom:56px;}
.section-head h2{font-size:clamp(28px,4vw,42px);}
.section-head p{color:var(--mist);font-size:17px;}
.section-dark .section-head p{color:#AAB3BC;}

/* =========================================================
   Services grid (home)
   ========================================================= */
.services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);}
.service-card{background:var(--paper);padding:40px 34px;display:flex;flex-direction:column;gap:16px;text-decoration:none;color:inherit;transition:background .2s ease;}
.service-card:hover{background:#fff;}
.service-num{font-family:var(--font-mono);font-size:13px;color:var(--copper);}
.service-card h3{font-size:22px;margin-bottom:4px;}
.service-card p{color:var(--mist);font-size:15px;margin-bottom:0;}
.service-icon{width:40px;height:40px;color:var(--steel);}
.service-link{margin-top:auto;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.05em;color:var(--copper);display:flex;align-items:center;gap:8px;}
@media(max-width:860px){.services-grid{grid-template-columns:1fr;}}

/* =========================================================
   Pillars / cards
   ========================================================= */
.pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:36px;}
.pillar h4{font-size:18px;border-top:2px solid var(--copper);padding-top:16px;}
.pillar p{color:var(--mist);font-size:15px;}
@media(max-width:760px){.pillars{grid-template-columns:1fr;}}

/* =========================================================
   Service detail sections
   ========================================================= */
.service-detail{border-top:1px solid var(--line);padding:70px 0;}
.service-detail:first-of-type{border-top:none;}
.service-detail-grid{display:grid;grid-template-columns:0.9fr 1.1fr;gap:60px;align-items:start;}
.service-detail-grid .points{list-style:none;margin:0;padding:0;display:grid;gap:14px;}
.service-detail-grid .points li{
  padding-left:26px;position:relative;color:var(--steel-soft);font-size:15.5px;
}
.service-detail-grid .points li::before{
  content:"";position:absolute;left:0;top:9px;width:12px;height:1px;background:var(--copper);
}
@media(max-width:860px){.service-detail-grid{grid-template-columns:1fr;gap:28px;}}

/* =========================================================
   Portfolio
   ========================================================= */
.portfolio-note{
  font-size:14px;color:var(--mist);border-left:2px solid var(--copper);padding-left:16px;margin-bottom:48px;max-width:60ch;
}
.portfolio-cols{display:grid;grid-template-columns:1fr 1fr;gap:56px;}
.portfolio-col h3{font-family:var(--font-mono);font-size:14px;letter-spacing:.06em;text-transform:uppercase;color:var(--copper);margin-bottom:22px;}
.portfolio-col ul{list-style:none;margin:0;padding:0;display:grid;gap:18px;}
.portfolio-col li{
  font-size:15px;color:var(--steel-soft);padding-bottom:18px;border-bottom:1px solid var(--line);
}
@media(max-width:860px){.portfolio-cols{grid-template-columns:1fr;}}

.tag-cloud{display:flex;flex-wrap:wrap;gap:10px;}
.tag{
  font-family:var(--font-mono);font-size:12.5px;border:1px solid var(--line);padding:7px 12px;color:var(--steel-soft);
}
.cred-block{margin-top:16px;}
.cred-block h4{font-size:14px;font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.05em;color:var(--mist);margin-bottom:14px;}

/* =========================================================
   Railways deliverables grid
   ========================================================= */
.deliv-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);}
.deliv-card{background:var(--paper);padding:28px 24px;}
.deliv-card h4{font-size:16px;margin-bottom:8px;color:var(--ink);}
.deliv-card p{font-size:14px;color:var(--mist);margin:0;}
.section-dark .deliv-card h4{color:var(--ink);}
.section-dark .deliv-card p{color:var(--mist);}
@media(max-width:960px){.deliv-grid{grid-template-columns:repeat(2,1fr);}}
@media(max-width:560px){.deliv-grid{grid-template-columns:1fr;}}

.system-list{display:flex;flex-wrap:wrap;gap:12px;}
.system-pill{
  font-family:var(--font-mono);font-size:13px;padding:9px 16px;border:1px solid var(--line-light);color:var(--paper);
}
.section-dark .tag{color:var(--paper);border-color:var(--line-light);}

/* =========================================================
   Partners / EOI form
   ========================================================= */
.partner-types{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);margin-bottom:70px;}
.partner-type{background:var(--paper);padding:30px 26px;}
.partner-type h4{font-size:17px;}
.partner-type p{font-size:14.5px;color:var(--mist);margin:0;}
@media(max-width:860px){.partner-types{grid-template-columns:1fr;}}

.eoi-form{
  max-width:760px;background:#fff;border:1px solid var(--line);padding:44px;
}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-bottom:22px;}
.form-field{display:flex;flex-direction:column;gap:8px;}
.form-field.full{grid-column:1/-1;}
.form-field label{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;color:var(--steel);text-transform:uppercase;}
.form-field input,.form-field select,.form-field textarea{
  font-family:var(--font-body);font-size:15px;padding:12px 14px;border:1px solid var(--line);background:var(--paper);color:var(--ink);
}
.form-field textarea{resize:vertical;min-height:110px;}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus{border-color:var(--copper);}
.form-note{font-size:13px;color:var(--mist);margin-top:14px;}
.form-success{
  display:none;padding:20px 22px;border:1px solid var(--signal);background:rgba(47,163,154,0.08);color:var(--steel);font-size:14.5px;margin-top:20px;
}
.form-success.show{display:block;}
@media(max-width:640px){.form-row{grid-template-columns:1fr;}.eoi-form{padding:28px;}}

/* =========================================================
   Contact / footer
   ========================================================= */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;}
.contact-list{list-style:none;margin:0;padding:0;font-family:var(--font-mono);font-size:14.5px;display:grid;gap:14px;}
.contact-list a{text-decoration:none;border-bottom:1px solid var(--line-light);}
@media(max-width:760px){.contact-grid{grid-template-columns:1fr;gap:30px;}}

.site-footer{background:var(--ink);color:#9AA3AC;padding:50px 0 30px;}
.footer-top{display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:30px;padding-bottom:36px;border-bottom:1px solid var(--line-light);margin-bottom:26px;}
.footer-brand{display:flex;align-items:center;gap:10px;}
.footer-brand span{font-family:var(--font-display);color:var(--paper);font-size:18px;}
.footer-links{display:flex;gap:26px;list-style:none;padding:0;margin:0;font-family:var(--font-mono);font-size:13px;}
.footer-links a{text-decoration:none;color:#AAB3BC;}
.footer-bottom{font-size:12.5px;font-family:var(--font-mono);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;}

/* =========================================================
   Buttons/misc utility
   ========================================================= */
.stat-strip{display:flex;gap:60px;flex-wrap:wrap;margin-top:20px;}
.stat{}
.stat b{display:block;font-family:var(--font-display);font-size:34px;color:var(--paper);}
.stat span{font-family:var(--font-mono);font-size:12px;color:#9AA3AC;letter-spacing:.05em;text-transform:uppercase;}

.page-hero{background:var(--ink);color:var(--paper);padding:90px 0 60px;}
.page-hero h1{color:var(--paper);font-size:clamp(32px,5vw,54px);max-width:20ch;}
.page-hero p{color:#C7CDD4;max-width:60ch;font-size:17px;}

.back-to-top{position:fixed;right:24px;bottom:24px;background:var(--ink);color:var(--paper);width:44px;height:44px;display:flex;align-items:center;justify-content:center;text-decoration:none;font-family:var(--font-mono);font-size:18px;opacity:0;pointer-events:none;transition:opacity .2s ease;z-index:40;}
.back-to-top.show{opacity:1;pointer-events:auto;}