/* ============================================================
   ETC SOLUTIONS — design system
   Paper & ink. The brand is a paper plane: everything on this
   site borrows from flight — trajectories, contrails, lift.
   ============================================================ */

:root{
  --paper:    #F7F6F3;
  --paper-2:  #EFEDE7;
  --ink:      #0B0B0C;
  --ink-2:    #17181B;
  --graphite: #3E4147;
  --slate:    #6A6E76;
  --hairline: rgba(11,11,12,.09);
  --hairline-strong: rgba(11,11,12,.16);
  --mist:     rgba(11,11,12,.045);
  --paper-on-ink: rgba(247,246,243,.92);
  --hairline-on-ink: rgba(247,246,243,.12);
  --mist-on-ink: rgba(247,246,243,.05);

  --grid: 72px;
  --radius: 18px;
  --gutter: clamp(20px, 4.5vw, 64px);
  --measure: 62ch;

  --font-display: 'Archivo', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  --ease-flight: cubic-bezier(.22,1,.36,1);
  --ease-pop:    cubic-bezier(.18,1.25,.32,1);
  --t-fast:.25s; --t-med:.5s; --t-slow:.9s;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
html:focus-within{scroll-behavior:smooth}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
a{color:inherit}
button{font:inherit;cursor:pointer}
::selection{background:var(--ink);color:var(--paper)}

:focus-visible{outline:2px solid var(--ink);outline-offset:3px;border-radius:2px}
.on-ink :focus-visible{outline-color:var(--paper)}

/* ---------- type scale ---------- */
.display-xl{
  font-family:var(--font-display);
  font-weight:800; font-stretch:116%;
  font-size:clamp(2.6rem,9.2vw,8.2rem);
  line-height:1; letter-spacing:.015em;
}
.display-lg{
  font-family:var(--font-display);
  font-weight:800; font-stretch:112%;
  font-size:clamp(2rem,5.4vw,4.4rem);
  line-height:1.04; letter-spacing:.005em;
}
.display-md{
  font-family:var(--font-display);
  font-weight:800; font-stretch:110%;
  font-size:clamp(1.5rem,3.2vw,2.5rem);
  line-height:1.12;
}
.eyebrow{
  font-family:var(--font-body);
  font-weight:600; font-size:11.5px;
  letter-spacing:.3em; text-transform:uppercase;
  color:var(--slate);
  display:flex; align-items:center; gap:14px;
}
.eyebrow::before{
  content:""; width:34px; height:1.5px; background:var(--ink);
  flex:none;
}
.on-ink .eyebrow{color:rgba(247,246,243,.55)}
.on-ink .eyebrow::before{background:var(--paper)}
.lede{
  font-size:clamp(1.02rem,1.7vw,1.22rem);
  line-height:1.65; color:var(--graphite);
  max-width:var(--measure);
}
.on-ink .lede{color:rgba(247,246,243,.72)}

/* ---------- layout ---------- */
.wrap{max-width:1280px;margin:0 auto;padding:0 var(--gutter)}
.section{padding:clamp(72px,11vh,140px) 0;position:relative}
.section-head{display:grid;gap:18px;max-width:820px;margin-bottom:clamp(36px,6vh,72px)}

/* ---------- background grid field ---------- */
.grid-field{
  position:absolute; inset:-80px; z-index:0; pointer-events:none;
  background:
    linear-gradient(var(--mist) 1px, transparent 1px),
    linear-gradient(90deg, var(--mist) 1px, transparent 1px);
  background-size:var(--grid) var(--grid);
  mask-image:radial-gradient(120% 90% at 50% 40%, #000 40%, transparent 100%);
  -webkit-mask-image:radial-gradient(120% 90% at 50% 40%, #000 40%, transparent 100%);
}

/* ---------- nav ---------- */
.nav{
  position:fixed; top:0; left:0; right:0; z-index:60;
  transition:background var(--t-fast) ease, box-shadow var(--t-fast) ease, transform .4s var(--ease-flight);
}
.nav.scrolled{
  background:rgba(247,246,243,.82);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  box-shadow:0 1px 0 var(--hairline);
}
.nav.hidden{transform:translateY(-100%)}
.nav-inner{
  display:flex; align-items:center; justify-content:space-between;
  padding:18px var(--gutter);
  max-width:1440px; margin:0 auto;
}
.nav-brand{
  display:flex; align-items:center; gap:12px;
  text-decoration:none;
  font-family:var(--font-display); font-weight:800; font-stretch:118%;
  letter-spacing:.13em; font-size:15px;
}
.nav-brand svg{width:26px;height:auto;transition:transform .45s var(--ease-pop)}
.nav-brand:hover svg{transform:translate(3px,-3px) rotate(-6deg)}
.nav-links{display:flex; gap:clamp(16px,2.6vw,36px); align-items:center;list-style:none}
.nav-links a{
  text-decoration:none; color:var(--graphite);
  font-size:13.5px; font-weight:500; letter-spacing:.02em;
  position:relative; padding:4px 0;
}
.nav-links a:not(.btn)::after{
  content:""; position:absolute; left:0; bottom:0;
  width:100%; height:1.5px; background:var(--ink);
  transform:scaleX(0); transform-origin:right;
  transition:transform .35s var(--ease-flight);
}
.nav-links a:not(.btn):hover::after,
.nav-links a[aria-current="page"]::after{transform:scaleX(1); transform-origin:left}
.nav-links a[aria-current="page"]{color:var(--ink)}

/* mobile nav */
.nav-toggle{
  display:none; background:none; border:0; width:44px; height:44px;
  position:relative; z-index:70;
}
.nav-toggle span{
  position:absolute; left:10px; right:10px; height:2px; background:var(--ink);
  transition:transform .35s var(--ease-flight), opacity .2s;
}
.nav-toggle span:nth-child(1){top:16px}
.nav-toggle span:nth-child(2){top:22px}
.nav-toggle span:nth-child(3){top:28px}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
@media (max-width:820px){
  .nav-toggle{display:block}
  .nav-links{
    position:fixed; inset:0; z-index:65;
    background:var(--paper);
    flex-direction:column; justify-content:center; gap:30px;
    font-size:20px;
    clip-path:circle(0 at calc(100% - 40px) 40px);
    transition:clip-path .6s var(--ease-flight);
    pointer-events:none;
  }
  .nav-links.open{clip-path:circle(150% at calc(100% - 40px) 40px);pointer-events:auto}
  .nav-links a{font-size:22px}
}

/* ---------- buttons ---------- */
.btn{
  font-family:var(--font-body); font-weight:600; font-size:15px;
  padding:15px 30px; border-radius:999px;
  text-decoration:none; letter-spacing:.01em;
  display:inline-flex; align-items:center; gap:10px;
  border:1.5px solid transparent;
  transition:transform var(--t-fast) var(--ease-pop), box-shadow var(--t-fast) ease,
             background var(--t-fast) ease, color var(--t-fast) ease, border-color var(--t-fast) ease;
  will-change:transform;
}
.btn-sm{padding:9px 18px;font-size:13.5px}
.btn-primary{background:var(--ink); color:var(--paper); border-color:var(--ink); box-shadow:0 1px 0 rgba(11,11,12,.2)}
.btn-primary:hover{box-shadow:0 16px 32px -14px rgba(11,11,12,.5)}
.btn-primary .arrow{transition:transform var(--t-fast) var(--ease-pop)}
.btn-primary:hover .arrow{transform:translate(3px,-3px)}
.btn-ghost{background:transparent; color:var(--ink); border-color:rgba(11,11,12,.28)}
.btn-ghost:hover{border-color:var(--ink)}
.on-ink .btn-primary{background:var(--paper); color:var(--ink); border-color:var(--paper)}
.on-ink .btn-ghost{color:var(--paper); border-color:rgba(247,246,243,.35)}
.on-ink .btn-ghost:hover{border-color:var(--paper)}

/* ---------- reveal-on-scroll ---------- */
.reveal{opacity:0; transform:translateY(26px); transition:opacity .8s var(--ease-flight), transform .8s var(--ease-flight)}
.reveal.in{opacity:1; transform:none}
.reveal-d1{transition-delay:.08s}
.reveal-d2{transition-delay:.16s}
.reveal-d3{transition-delay:.24s}
.reveal-d4{transition-delay:.32s}

/* ---------- cards ---------- */
.card{
  background:#fff;
  border:1px solid var(--hairline);
  border-radius:var(--radius);
  padding:clamp(26px,3vw,40px);
  position:relative;
  transition:transform .45s var(--ease-flight), box-shadow .45s ease, border-color .3s ease;
  transform-style:preserve-3d;
}
.card:hover{
  transform:translateY(-6px);
  box-shadow:0 24px 48px -24px rgba(11,11,12,.22);
  border-color:var(--hairline-strong);
}
.card h3{
  font-family:var(--font-display); font-weight:700; font-stretch:108%;
  font-size:1.25rem; margin:18px 0 10px;
}
.card p{color:var(--graphite); font-size:.96rem}
.card .glyph{
  width:46px;height:46px; border:1.5px solid var(--ink); border-radius:12px;
  display:grid; place-items:center;
  transition:background var(--t-fast) ease;
}
.card .glyph svg{width:22px;height:22px;stroke:var(--ink);transition:stroke var(--t-fast) ease}
.card:hover .glyph{background:var(--ink)}
.card:hover .glyph svg{stroke:var(--paper)}

/* ---------- dark section ---------- */
.on-ink{
  background:var(--ink); color:var(--paper-on-ink);
  position:relative; overflow:hidden;
}
.on-ink .grid-field{
  background:
    linear-gradient(var(--mist-on-ink) 1px, transparent 1px),
    linear-gradient(90deg, var(--mist-on-ink) 1px, transparent 1px);
  background-size:var(--grid) var(--grid);
}
.spotlight{
  position:absolute; inset:0; pointer-events:none; z-index:1;
  background:radial-gradient(560px 560px at var(--sx,50%) var(--sy,40%), rgba(247,246,243,.07), transparent 65%);
}

/* ---------- marquee ---------- */
.marquee{
  overflow:hidden; border-top:1px solid var(--hairline); border-bottom:1px solid var(--hairline);
  padding:18px 0; background:var(--paper);
  mask-image:linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  -webkit-mask-image:linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.marquee-track{
  display:flex; gap:56px; width:max-content;
  animation:marquee 34s linear infinite;
}
.marquee:hover .marquee-track{animation-play-state:paused}
.marquee-track span{
  font-family:var(--font-display); font-weight:600; font-stretch:110%;
  font-size:14px; letter-spacing:.22em; text-transform:uppercase;
  color:var(--slate); white-space:nowrap;
  display:flex; align-items:center; gap:56px;
}
.marquee-track span::after{content:"✦"; font-size:10px; color:var(--hairline-strong)}
@keyframes marquee{to{transform:translateX(-50%)}}

/* ---------- stats ---------- */
.stat .num{
  font-family:var(--font-display); font-weight:800; font-stretch:114%;
  font-size:clamp(2.4rem,5vw,4rem); line-height:1;
  display:flex; align-items:baseline;
}
.stat .num sup{font-size:.45em; margin-left:2px}
.stat .lbl{color:var(--slate); font-size:.9rem; margin-top:10px; letter-spacing:.04em}
.on-ink .stat .lbl{color:rgba(247,246,243,.55)}

/* ---------- flight path (scroll signature) ---------- */
#flightpath{
  position:absolute; top:0; left:0; width:100%; z-index:2;
  pointer-events:none; overflow:visible;
}
#flightpath path{
  fill:none; stroke:var(--ink); stroke-width:1.5;
  stroke-dasharray:5 9; stroke-linecap:round; opacity:.22;
}
#scrollplane{
  position:absolute; width:30px; height:30px; z-index:3; pointer-events:none;
  top:0; left:0; will-change:transform; opacity:0;
  transition:opacity .4s ease;
  filter:drop-shadow(0 4px 8px rgba(11,11,12,.25));
}
#scrollplane.visible{opacity:1}
@media (max-width:960px){#flightpath,#scrollplane{display:none}}

/* ---------- footer ---------- */
footer{background:var(--ink); color:var(--paper-on-ink); position:relative; overflow:hidden}
.footer-cta{padding:clamp(80px,14vh,160px) 0; text-align:center; position:relative; z-index:2}
.footer-cta .display-lg{color:var(--paper)}
.footer-grid{
  position:relative; z-index:2;
  display:flex; flex-wrap:wrap; gap:32px; justify-content:space-between; align-items:center;
  padding:28px var(--gutter);
  border-top:1px solid var(--hairline-on-ink);
  max-width:1440px; margin:0 auto;
  font-size:13.5px; color:rgba(247,246,243,.55);
}
.footer-grid a{color:rgba(247,246,243,.75); text-decoration:none; transition:color .2s}
.footer-grid a:hover{color:#fff}
.footer-links{display:flex; gap:26px; list-style:none; flex-wrap:wrap}

/* ---------- page hero (interior pages) ---------- */
.page-hero{padding:clamp(150px,22vh,220px) 0 clamp(50px,8vh,90px); position:relative}
.page-hero .display-lg{max-width:16ch}
.page-hero .lede{margin-top:22px}

/* kinetic word reveal used on interior heros */
.kinetic .w{display:inline-block; overflow:hidden; vertical-align:top}
.kinetic .w > span{display:inline-block; transform:translateY(112%); transition:transform .9s var(--ease-pop)}
.kinetic.in .w > span{transform:none}

/* ---------- forms ---------- */
.field{position:relative; margin-bottom:26px}
.field input,.field textarea,.field select{
  width:100%; background:transparent;
  border:0; border-bottom:1.5px solid var(--hairline-strong);
  padding:24px 0 12px; font:inherit; color:var(--ink);
  border-radius:0; transition:border-color .25s ease;
  appearance:none;
}
.field textarea{resize:vertical; min-height:120px}
.field label{
  position:absolute; left:0; top:22px; color:var(--slate);
  pointer-events:none; transition:all .28s var(--ease-flight);
  font-size:15.5px;
}
.field input:focus,.field textarea:focus,.field select:focus{outline:none; border-color:var(--ink)}
.field input:focus + label, .field input:not(:placeholder-shown) + label,
.field textarea:focus + label, .field textarea:not(:placeholder-shown) + label,
.field select:focus + label, .field.filled label{
  top:0; font-size:11px; letter-spacing:.14em; text-transform:uppercase; color:var(--ink);
}
.field .bar{
  position:absolute; bottom:0; left:0; height:1.5px; width:100%;
  background:var(--ink); transform:scaleX(0); transform-origin:left;
  transition:transform .4s var(--ease-flight);
}
.field input:focus ~ .bar,.field textarea:focus ~ .bar,.field select:focus ~ .bar{transform:scaleX(1)}

/* ---------- misc ---------- */
.scroll-cue{
  position:absolute; bottom:26px; left:50%; transform:translateX(-50%);
  display:flex; flex-direction:column; align-items:center; gap:10px;
  color:var(--graphite); font-size:10.5px; font-weight:600;
  letter-spacing:.3em; text-indent:.3em; z-index:4;
}
.scroll-cue .line{width:1.5px; height:34px; background:var(--hairline); position:relative; overflow:hidden}
.scroll-cue .line::after{
  content:""; position:absolute; left:0; top:-100%; width:100%; height:100%;
  background:var(--ink); animation:cueDrop 2.2s var(--ease-flight) infinite;
}
@keyframes cueDrop{0%{top:-100%}55%{top:100%}100%{top:100%}}

/* signal dots drifting along grid lines */
.signal{
  position:absolute; width:4px; height:4px; border-radius:50%;
  background:var(--ink); opacity:0; pointer-events:none; z-index:1;
}
@keyframes signalX{
  0%{opacity:0; transform:translateX(0)}
  10%{opacity:.35} 90%{opacity:.35}
  100%{opacity:0; transform:translateX(var(--travel,300px))}
}
@keyframes signalY{
  0%{opacity:0; transform:translateY(0)}
  10%{opacity:.35} 90%{opacity:.35}
  100%{opacity:0; transform:translateY(var(--travel,300px))}
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1; transform:none}
  .kinetic .w > span{transform:none}
  #flightpath,#scrollplane,.signal{display:none}
}