/* ==========================================================================
   INT CET — International Construction, Engineering & Technology
   Design language: technical drawing / blueprint title-block system.
   Registration marks (+) and title-block strips are structural devices
   borrowed from engineering drawing sheets — not decoration.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@500;600;700;800&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  /* --- color tokens, drawn from the INT CET logo (navy + sky-blue) --- */
  --ink:        #10182C;   /* deep navy-black */
  --ink-70:     rgba(16,24,44,0.7);
  --ink-45:     rgba(16,24,44,0.45);
  --paper:      #F1F3F6;   /* cool off-white */
  --paper-raise:#FFFFFF;
  --steel:      #5B6675;   /* secondary text / rules */
  --blueprint:  #1E2B5C;   /* brand navy */
  --blueprint-d:#141D42;
  --signal:     #1C84B8;   /* brand cyan, from the logo's INT lettering/globe */
  --line:       #D7DCE2;   /* hairline divider on paper */
  --line-dark:  rgba(241,243,246,0.14); /* hairline divider on ink */

  /* --- type --- */
  --f-display: 'Archivo', sans-serif;
  --f-body:    'Inter', sans-serif;
  --f-mono:    'IBM Plex Mono', monospace;

  --container: 1180px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--f-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img,svg{ display:block; max-width:100%; }
a{ color:inherit; text-decoration:none; }
h1,h2,h3,h4{ font-family:var(--f-display); margin:0; letter-spacing:-0.01em; }
p{ margin:0; }
ul{ margin:0; padding:0; list-style:none; }
button{ font-family:inherit; cursor:pointer; }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important; }
}

:focus-visible{
  outline:2px solid var(--signal);
  outline-offset:3px;
}

.wrap{ max-width:var(--container); margin:0 auto; padding:0 32px; }

/* --- eyebrow / mono label with registration mark ------------------------ */
.eyebrow{
  display:flex; align-items:center; gap:10px;
  font-family:var(--f-mono); font-size:12.5px; letter-spacing:0.14em;
  text-transform:uppercase; color:var(--blueprint); margin-bottom:18px;
}
.eyebrow::before{
  content:"+"; font-size:16px; color:var(--signal); line-height:1;
}
.eyebrow.on-dark{ color:#7FC1E0; }
.eyebrow.on-dark::before{ color:var(--signal); }

/* --- registration corner marks (signature motif) ------------------------ */
.reg-corners{ position:relative; }
.reg-corners::before,
.reg-corners::after{
  content:"+";
  position:absolute; font-family:var(--f-mono); font-size:18px;
  color:var(--line); line-height:1; pointer-events:none;
}
.reg-corners::before{ top:-9px; left:-2px; }
.reg-corners::after{ bottom:-9px; right:-2px; }

/* ==========================================================================
   HEADER / NAV
   ========================================================================== */
.site-header{
  position:sticky; top:0; z-index:100;
  background:rgba(242,244,248,0.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding:20px 32px;
  max-width:var(--container); margin:0 auto;
}
.brand{
  display:flex; align-items:center; gap:10px;
}
.brand img{ height:38px; width:auto; display:block; }
.brand .brand-text{ display:flex; flex-direction:column; gap:1px; }
.brand .brand-name{
  font-family:var(--f-display); font-weight:800; font-size:18px;
  letter-spacing:0.02em; color:var(--ink); line-height:1;
}
.brand .brand-tag{
  font-family:var(--f-mono); font-weight:400; font-size:9.5px;
  letter-spacing:0.06em; color:var(--steel); text-transform:uppercase; line-height:1;
}
.nav-links{ display:flex; gap:36px; align-items:center; }
.nav-links a{
  font-family:var(--f-mono); font-size:13px; letter-spacing:0.06em;
  text-transform:uppercase; color:var(--ink-70);
  padding:6px 0; border-bottom:1px solid transparent;
  transition:color .18s ease, border-color .18s ease;
}
.nav-links a:hover{ color:var(--blueprint); border-color:var(--blueprint); }
.nav-links a.active{ color:var(--ink); border-color:var(--signal); }
.nav-cta{
  font-family:var(--f-mono); font-size:12.5px; letter-spacing:0.06em; text-transform:uppercase;
  padding:10px 18px; background:var(--ink); color:var(--paper) !important;
  border:1px solid var(--ink); border-radius:2px;
  transition:background .18s ease, color .18s ease;
}
.nav-cta:hover{ background:var(--signal); border-color:var(--signal); color:#fff !important; }
.nav-toggle{ display:none; }

@media (max-width: 860px){
  .nav-links{
    position:fixed; inset:73px 0 0 0; background:var(--paper);
    flex-direction:column; align-items:flex-start; gap:0;
    padding:8px 32px 24px; border-top:1px solid var(--line);
    transform:translateY(-8px); opacity:0; pointer-events:none;
    transition:opacity .2s ease, transform .2s ease;
  }
  .nav-links.open{ transform:translateY(0); opacity:1; pointer-events:auto; }
  .nav-links a{ width:100%; padding:14px 0; border-bottom:1px solid var(--line); }
  .nav-links a.active{ border-bottom-color:var(--signal); }
  .nav-toggle{
    display:flex; flex-direction:column; gap:5px; background:none; border:none; padding:6px;
  }
  .nav-toggle span{ width:22px; height:2px; background:var(--ink); display:block; }
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn{
  display:inline-flex; align-items:center; gap:10px;
  font-family:var(--f-mono); font-size:13px; letter-spacing:0.06em; text-transform:uppercase;
  padding:14px 24px; border-radius:2px; border:1px solid transparent;
  transition:transform .18s ease, background .18s ease, color .18s ease, border-color .18s ease;
}
.btn:hover{ transform:translateY(-2px); }
.btn-primary{ background:var(--signal); color:#fff; }
.btn-primary:hover{ background:#c26d09; }
.btn-outline{ border-color:var(--ink); color:var(--ink); }
.btn-outline:hover{ background:var(--ink); color:var(--paper); }
.btn-outline.on-dark{ border-color:rgba(241,238,231,0.5); color:var(--paper); }
.btn-outline.on-dark:hover{ background:var(--paper); color:var(--ink); }
.btn-arrow::after{ content:"→"; }

/* ==========================================================================
   TITLE-BLOCK STRIP (signature component — repurposed drawing title block)
   ========================================================================== */
.title-block{
  display:grid; grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--line); border-bottom:1px solid var(--line);
  background:var(--paper-raise);
}
.title-block div{
  padding:22px 28px; border-left:1px solid var(--line);
}
.title-block div:first-child{ border-left:none; }
.title-block .tb-label{
  display:block; font-family:var(--f-mono); font-size:11px; letter-spacing:0.1em;
  text-transform:uppercase; color:var(--steel); margin-bottom:8px;
}
.title-block .tb-value{
  font-family:var(--f-display); font-weight:700; font-size:22px; color:var(--ink);
}
@media (max-width: 760px){
  .title-block{ grid-template-columns:repeat(2,1fr); }
  .title-block div:nth-child(3){ border-left:none; }
}

/* ==========================================================================
   HERO
   ========================================================================== */
.hero{
  position:relative; overflow:hidden;
  padding:96px 0 0;
  background:var(--paper);
}
.hero-grid{
  display:grid; grid-template-columns:1.1fr 0.9fr; gap:40px; align-items:center;
  max-width:var(--container); margin:0 auto; padding:0 32px 72px;
  position:relative; z-index:2;
}
.hero h1{
  font-size:clamp(38px, 5.4vw, 68px); font-weight:800; line-height:1.02;
  color:var(--ink); margin-bottom:24px;
}
.hero h1 em{
  font-style:normal; color:var(--blueprint);
  text-decoration:underline; text-decoration-color:var(--signal);
  text-decoration-thickness:3px; text-underline-offset:8px;
}
.hero p.lead{
  font-size:17.5px; color:var(--ink-70); max-width:46ch; margin-bottom:34px;
}
.hero-actions{ display:flex; gap:16px; flex-wrap:wrap; }
.hero-art{ position:relative; }
.hero-art svg{ width:100%; height:auto; }

@media (max-width: 900px){
  .hero-grid{ grid-template-columns:1fr; }
  .hero-art{ order:-1; max-width:340px; margin:0 auto 12px; }
}

/* ==========================================================================
   SECTIONS
   ========================================================================== */
section{ padding:96px 0; }
section.tight{ padding:72px 0; }
.section-head{ max-width:640px; margin-bottom:56px; }
.section-head h2{ font-size:clamp(28px,3.4vw,42px); font-weight:800; line-height:1.08; }
.section-head p{ margin-top:16px; color:var(--ink-70); font-size:16.5px; max-width:56ch; }

.on-ink{ background:var(--ink); color:var(--paper); }
.on-ink .steel-text{ color:#9AA3AC; }
.on-ink .eyebrow{ color:#9FB8CE; }
.on-ink hr{ border-color:var(--line-dark); }

/* ==========================================================================
   CARDS — services / values / portfolio
   ========================================================================== */
.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border:1px solid var(--line); }
.grid-2{ display:grid; grid-template-columns:repeat(2,1fr); gap:1px; background:var(--line); border:1px solid var(--line); }
@media (max-width: 860px){ .grid-3{ grid-template-columns:1fr; } .grid-2{ grid-template-columns:1fr; } }

.card{
  background:var(--paper-raise); padding:36px 32px;
  transition:background .2s ease;
}
.card:hover{ background:#fff; }
.card .num{ font-family:var(--f-mono); font-size:12px; color:var(--signal); letter-spacing:0.08em; }
.card h3{ font-size:21px; font-weight:700; margin:14px 0 12px; }
.card p{ color:var(--ink-70); font-size:15px; }

/* ==========================================================================
   PORTFOLIO / GALLERY
   ========================================================================== */
.filter-bar{
  display:flex; gap:10px; flex-wrap:wrap; margin-bottom:44px;
}
.filter-btn{
  font-family:var(--f-mono); font-size:12.5px; letter-spacing:0.06em; text-transform:uppercase;
  padding:10px 18px; border:1px solid var(--line); background:transparent; color:var(--ink-70);
  border-radius:2px; transition:all .18s ease;
}
.filter-btn:hover{ border-color:var(--blueprint); color:var(--blueprint); }
.filter-btn.active{ background:var(--ink); border-color:var(--ink); color:var(--paper); }

.gallery{ display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
@media (max-width: 900px){ .gallery{ grid-template-columns:repeat(2,1fr); } }
@media (max-width: 600px){ .gallery{ grid-template-columns:1fr; } }

.gallery-item{
  position:relative; border:1px solid var(--line); background:var(--paper-raise);
  overflow:hidden; transition:transform .2s ease, box-shadow .2s ease;
}
.gallery-item:hover{ transform:translateY(-4px); box-shadow:0 14px 30px rgba(18,24,31,0.12); }
.gallery-item .thumb{ aspect-ratio:4/3; width:100%; }
.gallery-item .meta{ padding:18px 20px; border-top:1px solid var(--line); }
.gallery-item .tag{
  font-family:var(--f-mono); font-size:10.5px; letter-spacing:0.08em; text-transform:uppercase;
  color:var(--blueprint);
}
.gallery-item h3{ font-size:17px; margin-top:8px; font-weight:700; }
.gallery-item .loc{ font-size:13px; color:var(--steel); margin-top:4px; }
.gallery-item[hidden]{ display:none; }

/* placeholder state — used until real project photography is supplied */
.thumb-empty{
  width:100%; height:100%; display:flex; flex-direction:column; align-items:center;
  justify-content:center; gap:10px; background:
    repeating-linear-gradient(135deg, var(--line) 0 1px, transparent 1px 14px), var(--paper);
}
.thumb-empty .mark{ font-family:var(--f-mono); font-size:20px; color:var(--steel); border:1px solid var(--line); width:36px; height:36px; display:flex; align-items:center; justify-content:center; background:var(--paper-raise); }
.thumb-empty span.label{ font-family:var(--f-mono); font-size:10.5px; letter-spacing:0.08em; text-transform:uppercase; color:var(--steel); }

/* ==========================================================================
   PROCESS / TIMELINE (About)
   ========================================================================== */
.process{ display:grid; gap:0; border-top:1px solid var(--line); }
.process-row{
  display:grid; grid-template-columns:100px 1fr 2fr; gap:28px; align-items:start;
  padding:32px 0; border-bottom:1px solid var(--line);
}
.process-row .step-no{ font-family:var(--f-mono); color:var(--signal); font-size:14px; }
.process-row h3{ font-size:19px; font-weight:700; }
.process-row p{ color:var(--ink-70); font-size:15px; }
@media (max-width: 720px){
  .process-row{ grid-template-columns:1fr; gap:8px; }
}

/* ==========================================================================
   STATS
   ========================================================================== */
.stat{ text-align:left; }
.stat .n{ font-family:var(--f-display); font-weight:800; font-size:44px; color:var(--paper); }
.stat .l{ font-family:var(--f-mono); font-size:12px; letter-spacing:0.08em; text-transform:uppercase; color:#9AA3AC; margin-top:8px; }

/* ==========================================================================
   FORM (Contact)
   ========================================================================== */
.form-grid{ display:grid; grid-template-columns:1.1fr 0.9fr; gap:0; border:1px solid var(--line); }
@media (max-width: 900px){ .form-grid{ grid-template-columns:1fr; } }

.form-panel{ background:var(--paper-raise); padding:48px; }
.info-panel{ background:var(--ink); color:var(--paper); padding:48px; }
.info-panel h3{ font-size:20px; margin-bottom:22px; }
.info-row{ padding:18px 0; border-top:1px solid var(--line-dark); }
.info-row:first-of-type{ border-top:none; }
.info-row .tb-label{ display:block; font-family:var(--f-mono); font-size:11px; letter-spacing:0.1em; text-transform:uppercase; color:#9AA3AC; margin-bottom:6px; }
.info-row .tb-value{ font-size:15.5px; }

.field{ margin-bottom:22px; }
.field label{
  display:block; font-family:var(--f-mono); font-size:11.5px; letter-spacing:0.08em;
  text-transform:uppercase; color:var(--steel); margin-bottom:8px;
}
.field input, .field textarea, .field select{
  width:100%; padding:13px 14px; border:1px solid var(--line); background:#fff;
  font-family:var(--f-body); font-size:15px; color:var(--ink); border-radius:2px;
  transition:border-color .18s ease;
}
.field input:focus, .field textarea:focus, .field select:focus{ border-color:var(--blueprint); outline:none; }
.field textarea{ resize:vertical; min-height:120px; }
.form-row-2{ display:grid; grid-template-columns:1fr 1fr; gap:18px; }
@media (max-width:520px){ .form-row-2{ grid-template-columns:1fr; } }
.form-note{ font-size:13px; color:var(--steel); margin-top:14px; }
.form-success{
  display:none; padding:16px 18px; background:#eef4ee; border:1px solid #b8d4b8;
  color:#2c5a2c; font-size:14.5px; border-radius:2px; margin-top:18px;
}
.form-success.show{ display:block; }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer{ background:var(--ink); color:var(--paper); padding:64px 0 0; }
.footer-top{ display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:40px; padding-bottom:56px; }
@media (max-width:820px){ .footer-top{ grid-template-columns:1fr 1fr; } }
@media (max-width:520px){ .footer-top{ grid-template-columns:1fr; } }
.footer-brand{ font-family:var(--f-display); font-weight:800; font-size:22px; margin-bottom:14px; }
.footer-col h4{
  font-family:var(--f-mono); font-size:11.5px; letter-spacing:0.1em; text-transform:uppercase;
  color:#9AA3AC; margin-bottom:16px;
}
.footer-col a, .footer-col p{ display:block; font-size:14.5px; color:#D8D4CC; margin-bottom:10px; }
.footer-col a:hover{ color:var(--signal); }
.footer-bottom{
  border-top:1px solid var(--line-dark); padding:22px 0; display:flex;
  justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px;
}
.footer-bottom p{ font-family:var(--f-mono); font-size:12px; color:#8B939B; }
.footer-legal{ font-size:11.5px; color:#7E8794; }

/* ==========================================================================
   REVEAL ON SCROLL
   ========================================================================== */
.reveal{ opacity:0; transform:translateY(18px); transition:opacity .6s ease, transform .6s ease; }
.reveal.in{ opacity:1; transform:translateY(0); }