/* ==========================================================================
   VIDHARTH INFRACON — Design System
   Palette: #ffffff (white) + #28398b (navy) only — tints/opacities of navy
   for depth. Display face: Archivo Black. Body/UI face: Archivo.
   Motif: technical blueprint — sheet numbers, dimension lines, drawn skyline.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Archivo+Black&family=Archivo:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400&display=swap');

:root{
  --navy: #28398b;
  --white: #ffffff;

  --navy-04: rgba(40,57,139,0.04);
  --navy-08: rgba(40,57,139,0.08);
  --navy-12: rgba(40,57,139,0.12);
  --navy-18: rgba(40,57,139,0.18);
  --navy-30: rgba(40,57,139,0.30);
  --navy-55: rgba(40,57,139,0.55);
  --navy-70: rgba(40,57,139,0.70);
  --navy-88: rgba(40,57,139,0.88);

  --white-08: rgba(255,255,255,0.08);
  --white-15: rgba(255,255,255,0.15);
  --white-30: rgba(255,255,255,0.30);
  --white-55: rgba(255,255,255,0.55);
  --white-80: rgba(255,255,255,0.80);

  --display: 'Archivo Black', 'Archivo', Arial, sans-serif;
  --body: 'Archivo', Arial, sans-serif;

  --container: 1240px;
  --pad: clamp(20px, 5vw, 64px);
  --radius: 2px;

  --ease: cubic-bezier(.16,.84,.44,1);
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--body);
  color:var(--navy);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
button{ font-family:inherit; cursor:pointer; }
h1,h2,h3,h4{ margin:0; font-family:var(--display); font-weight:400; line-height:1.02; letter-spacing:-0.01em; }
p{ margin:0; }

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

/* ---------- layout ---------- */
.wrap{ max-width:var(--container); margin:0 auto; padding-left:var(--pad); padding-right:var(--pad); }
.section{ position:relative; padding:clamp(64px,10vw,120px) 0; }
.section--navy{ background:var(--navy); color:var(--white); }
.section--tint{ background:var(--navy-04); }
.section--tight{ padding:clamp(40px,6vw,72px) 0; }

/* blueprint faint grid backdrop */
.grid-bg{ position:absolute; inset:0; pointer-events:none; opacity:0.5;
  background-image:
    linear-gradient(var(--navy-08) 1px, transparent 1px),
    linear-gradient(90deg, var(--navy-08) 1px, transparent 1px);
  background-size:56px 56px;
  mask-image:linear-gradient(to bottom, black, transparent 92%);
}
.section--navy .grid-bg{
  background-image:
    linear-gradient(var(--white-08) 1px, transparent 1px),
    linear-gradient(90deg, var(--white-08) 1px, transparent 1px);
}

/* corner brackets — blueprint registration marks */
.bracket{ position:relative; }
.bracket::before,.bracket::after{
  content:''; position:absolute; width:18px; height:18px; pointer-events:none;
}
.bracket::before{ top:-1px; left:-1px; border-top:2px solid var(--navy); border-left:2px solid var(--navy); }
.bracket::after{ bottom:-1px; right:-1px; border-bottom:2px solid var(--navy); border-right:2px solid var(--navy); }
.section--navy .bracket::before{ border-color:var(--white); }
.section--navy .bracket::after{ border-color:var(--white); }

/* eyebrow / sheet label — reads like a drawing-sheet index */
.sheet{
  display:flex; align-items:center; gap:10px;
  font-family:var(--body); font-weight:700; font-size:12.5px;
  letter-spacing:0.16em; text-transform:uppercase; color:var(--navy-70);
  margin-bottom:18px;
}
.section--navy .sheet{ color:var(--white-80); }
.sheet::before{ content:''; width:26px; height:1px; background:currentColor; }

/* dimension-line divider — technical drawing measurement motif */
.dim{ display:flex; align-items:center; gap:8px; color:var(--navy-30); margin:36px 0; }
.section--navy .dim{ color:var(--white-30); }
.dim::before,.dim::after{ content:''; flex:1; height:1px; background:currentColor; }
.dim span{ font-size:11px; letter-spacing:0.14em; font-weight:700; white-space:nowrap; }

/* ---------- type scale ---------- */
.h-display{ font-size:clamp(40px, 6.4vw, 92px); }
.h-xl{ font-size:clamp(32px, 4.6vw, 56px); }
.h-lg{ font-size:clamp(26px, 3.2vw, 38px); }
.h-md{ font-size:clamp(20px, 2.2vw, 26px); font-family:var(--body); font-weight:800; letter-spacing:-0.01em; }
.eyebrow{ font-weight:700; letter-spacing:0.16em; text-transform:uppercase; font-size:12.5px; color:var(--navy-70); }
.lede{ font-size:clamp(16px,1.4vw,19px); line-height:1.65; color:var(--navy-88); font-weight:400; }
.section--navy .lede{ color:var(--white-80); }
.body-copy{ font-size:16px; line-height:1.75; color:var(--navy-88); }
.section--navy .body-copy{ color:var(--white-80); }

/* ---------- buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:10px;
  padding:16px 28px; font-weight:700; font-size:14px; letter-spacing:0.03em; text-transform:uppercase;
  border-radius:var(--radius); border:1.5px solid var(--navy); transition:transform .25s var(--ease), background .25s var(--ease), color .25s var(--ease);
  white-space:nowrap;
}
.btn--solid{ background:var(--navy); color:var(--white); }
.btn--solid:hover{ transform:translateY(-2px); background:#1f2d6e; }
.btn--ghost{ background:transparent; color:var(--navy); }
.btn--ghost:hover{ transform:translateY(-2px); background:var(--navy); color:var(--white); }
.section--navy .btn{ border-color:var(--white); }
.section--navy .btn--ghost{ color:var(--white); }
.section--navy .btn--ghost:hover{ background:var(--white); color:var(--navy); }
.section--navy .btn--solid{ background:var(--white); color:var(--navy); }
.section--navy .btn--solid:hover{ background:var(--white-80); }
.btn-row{ display:flex; gap:14px; flex-wrap:wrap; }
.btn svg{ width:14px; height:14px; transition:transform .25s var(--ease); }
.btn:hover svg{ transform:translate(3px,-3px); }

/* ---------- header ---------- */
.site-header{
  position:fixed; top:0; left:0; right:0; z-index:100;
  display:flex; align-items:center; justify-content:space-between;
  padding:18px var(--pad);
  background:var(--white-80); backdrop-filter:blur(10px);
  border-bottom:1px solid var(--navy-12);
  transition:padding .3s var(--ease), background .3s var(--ease);
}
.site-header.is-scrolled{ padding:12px var(--pad); background:rgba(255,255,255,0.94); }
.brand{ display:flex; align-items:center; gap:10px; }
.brand img{ height:34px; width:auto; }
.main-nav{ display:flex; align-items:center; gap:2px; }
.main-nav a{
  position:relative; padding:10px 16px; font-size:13.5px; font-weight:700;
  letter-spacing:0.04em; text-transform:uppercase; color:var(--navy-70);
  transition:color .2s;
}
.main-nav a:hover, .main-nav a.is-active{ color:var(--navy); }
.main-nav a.is-active::after{
  content:''; position:absolute; left:16px; right:16px; bottom:4px; height:2px; background:var(--navy);
}
.nav-cta{ margin-left:10px; }
.nav-toggle{ display:none; background:none; border:none; padding:8px; }
.nav-toggle span{ display:block; width:24px; height:2px; background:var(--navy); margin:5px 0; transition:transform .25s, opacity .25s; }
.nav-toggle.is-open span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2){ opacity:0; }
.nav-toggle.is-open span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

@media (max-width:900px){
  .main-nav{
    position:fixed; inset:0 0 0 auto; width:min(320px,84vw); height:100vh;
    background:var(--navy); flex-direction:column; align-items:flex-start; justify-content:center;
    gap:6px; padding:40px; transform:translateX(100%); transition:transform .4s var(--ease); z-index:99;
  }
  .main-nav.is-open{ transform:translateX(0); }
  .main-nav a{ color:var(--white-80); font-size:15px; padding:12px 0; width:100%; border-bottom:1px solid var(--white-15); }
  .main-nav a.is-active{ color:var(--white); }
  .main-nav a.is-active::after{ display:none; }
  .nav-cta{ margin-left:0; margin-top:14px; }
  .nav-toggle{ display:block; }
}

/* ---------- footer ---------- */
.site-footer{ background:var(--navy); color:var(--white); padding:72px 0 28px; }
.footer-grid{ display:grid; grid-template-columns:1.6fr 1fr 1fr 1.3fr; gap:40px; padding-bottom:48px; border-bottom:1px solid var(--white-15); }
.footer-brand img{ height:30px; margin-bottom:16px; }
.footer-tag{ color:var(--white-55); font-size:14px; max-width:26ch; line-height:1.6; }
.footer-col h4{ font-family:var(--body); font-size:13px; font-weight:800; text-transform:uppercase; letter-spacing:0.1em; margin-bottom:18px; color:var(--white-80); }
.footer-col li{ margin-bottom:11px; }
.footer-col a{ color:var(--white-80); font-size:14.5px; transition:color .2s; }
.footer-col a:hover{ color:var(--white); }
.footer-bottom{ display:flex; justify-content:space-between; align-items:center; padding-top:24px; flex-wrap:wrap; gap:10px; color:var(--white-55); font-size:13px; }
.footer-social{ display:flex; gap:14px; }
.footer-social a{ color:var(--white-80); }
@media (max-width:820px){ .footer-grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:520px){ .footer-grid{ grid-template-columns:1fr; } }

/* ---------- reveal-on-scroll ---------- */
.reveal{ opacity:0; transform:translateY(28px); transition:opacity .8s var(--ease), transform .8s var(--ease); }
.reveal.is-visible{ opacity:1; transform:translateY(0); }
.reveal-stagger > *{ transition-delay:calc(var(--i,0) * 90ms); }

/* ---------- skyline motif (used in hero + dividers) ---------- */
.skyline{ width:100%; height:auto; display:block; }
.skyline path, .skyline rect, .skyline line{
  fill:none; stroke:currentColor; stroke-width:1.6; stroke-linejoin:round; stroke-linecap:round;
}
.skyline .fill{ fill:currentColor; fill-opacity:0.06; stroke:none; }
.skyline-draw path, .skyline-draw rect, .skyline-draw line{
  stroke-dasharray:2600; stroke-dashoffset:2600;
  animation:draw 2.6s var(--ease) forwards;
}
@keyframes draw{ to{ stroke-dashoffset:0; } }

/* isometric cube icon base (3D device, two-tone via opacity) */
.iso{ width:64px; height:64px; }
.iso .a{ fill:var(--navy); }
.iso .b{ fill:var(--navy); opacity:0.72; }
.iso .c{ fill:var(--navy); opacity:0.46; }
.section--navy .iso .a,.section--navy .iso .b,.section--navy .iso .c{ fill:var(--white); }
.section--navy .iso .b{ opacity:0.72; }
.section--navy .iso .c{ opacity:0.46; }

/* ---------- stat strip ---------- */
.stats{ display:grid; grid-template-columns:repeat(4,1fr); }
.stat{ padding:36px var(--pad); text-align:left; border-left:1px solid var(--white-15); }
.stat:first-child{ border-left:none; }
.stat b{ display:block; font-family:var(--display); font-size:clamp(30px,3.4vw,46px); line-height:1; margin-bottom:8px; }
.stat span{ font-size:12.5px; letter-spacing:0.08em; text-transform:uppercase; color:var(--white-80); font-weight:700; }
@media (max-width:760px){ .stats{ grid-template-columns:1fr 1fr; } .stat{ border-left:none; border-top:1px solid var(--white-15); } }

/* ---------- cards ---------- */
.card{
  background:var(--white); border:1px solid var(--navy-12); border-radius:var(--radius);
  padding:32px; transition:transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s;
  position:relative;
}
.card:hover{ transform:translateY(-6px); box-shadow:0 24px 48px -24px var(--navy-30); border-color:var(--navy-30); }
.card .tag{ font-size:11px; font-weight:800; letter-spacing:0.1em; text-transform:uppercase; color:var(--navy-55); }
.card h3{ font-family:var(--body); font-weight:800; font-size:20px; margin:14px 0 10px; }
.card p{ font-size:14.5px; line-height:1.65; color:var(--navy-70); }

/* pill tag */
.pill{ display:inline-flex; align-items:center; gap:6px; padding:6px 14px; border:1px solid var(--navy-30); border-radius:999px; font-size:11.5px; font-weight:700; letter-spacing:0.06em; text-transform:uppercase; }

/* ---------- generic page hero (interior pages) ---------- */
.page-hero{ padding:calc(var(--pad) * 3.2) 0 clamp(48px,7vw,80px); background:var(--navy); color:var(--white); position:relative; overflow:hidden; }
.page-hero .crumb{ display:flex; gap:8px; align-items:center; font-size:12.5px; letter-spacing:0.08em; text-transform:uppercase; color:var(--white-55); margin-bottom:22px; font-weight:700; }
.page-hero .crumb span{ color:var(--white); }

/* ---------- utility ---------- */
.center{ text-align:center; }
.mx-auto{ margin-left:auto; margin-right:auto; }
.max-w-copy{ max-width:640px; }
.flex-between{ display:flex; align-items:center; justify-content:space-between; gap:24px; flex-wrap:wrap; }
.gap-64{ gap:64px; }
.two-col{ display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:center; }
@media (max-width:860px){ .two-col{ grid-template-columns:1fr; gap:36px; } }

/* back to top */
.to-top{ position:fixed; right:24px; bottom:24px; z-index:90; width:46px; height:46px; border-radius:50%; background:var(--navy); color:var(--white); display:flex; align-items:center; justify-content:center; opacity:0; pointer-events:none; transform:translateY(10px); transition:opacity .3s, transform .3s; border:none; }
.to-top.is-visible{ opacity:1; pointer-events:auto; transform:translateY(0); }