:root{
  /* ---- palette (Blueprint Paper; see DESIGN.md) ----
     Neutrals are tinted toward the brand blue (hue 264) so nothing is a
     dead #fff/#000. Cornflower is display emphasis only (headline words,
     the dither mark); it is too light for small text on paper. Royal is
     the one interactive color: buttons, links, focus, selection. */
  --paper:oklch(99.4% 0.003 264);
  --paper-2:oklch(97.6% 0.006 264);
  --paper-3:oklch(95.4% 0.011 264);
  --ink:oklch(16% 0.012 264);
  --ink-2:oklch(38% 0.016 264);
  --ink-3:oklch(50% 0.016 264);
  --blue:oklch(65.5% 0.185 263);       /* cornflower, ~#538BFD */
  --blue-100:oklch(94% 0.035 263);
  --royal:oklch(47% 0.2 266);          /* ~#2B4BC9 */
  --royal-hi:oklch(41% 0.19 266);
  --on-royal:oklch(99% 0.006 264);
  --danger:oklch(52% 0.17 28);
  --line:oklch(16% 0.012 264 / 0.11);
  --line-strong:oklch(16% 0.012 264 / 0.24);
  --cross:oklch(16% 0.012 264 / 0.55);

  /* ---- type ---- */
  --f-display:'Switzer', system-ui, sans-serif;
  --f-body:'General Sans', system-ui, sans-serif;
  --f-mono:'IBM Plex Mono', ui-monospace, monospace;
  --t-xs:12px;
  --t-sm:13px;
  --t-base:15px;
  --t-md:17px;
  --t-lg:22px;
  --t-display:clamp(46px, 7.4vw, 108px);
  --t-section:clamp(32px, 4.4vw, 56px);

  /* ---- spacing ---- */
  --s-1:4px;  --s-2:8px;  --s-3:12px; --s-4:16px; --s-5:24px;
  --s-6:32px; --s-7:48px; --s-8:64px; --s-9:96px; --s-10:132px;
  --gutter:48px;

  /* ---- motion: critically damped by default (apple-design) ---- */
  --ease-settle:cubic-bezier(.22,1,.36,1);
  --ease-press:cubic-bezier(.4,0,.2,1);

  --r-sm:4px;
  --r-md:6px;
  --max:1240px;

  --mark-o:1;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth; overflow-x:hidden; scroll-padding-top:72px;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--f-body);
  font-size:var(--t-base);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3{font-family:var(--f-display); margin:0; font-weight:500;}
a{color:inherit; text-decoration:none;}
img{max-width:100%; display:block;}
::selection{background:var(--royal); color:var(--on-royal);}
.wrap{width:min(var(--max), 100% - 48px); margin:0 auto;}
@media (max-width:640px){ .wrap{width:100%;} }
.accent{color:var(--blue);}

:focus-visible{outline:2px solid var(--royal); outline-offset:3px; border-radius:var(--r-sm);}

/* ---------- brand mark ---------- */
.mark{display:block; color:var(--royal); flex:none;}
.mark use, .mark path{fill:currentColor;}

/* ---------- blueprint frame ----------
   Every band shares two hairline rails (the .band-inner's inline borders)
   and a full-bleed top rule. Where the rule crosses a rail, a small "+"
   marks the joint, so the page reads as one continuous drawing rather
   than stacked boxes. The crosses sit on the rule, centered on the rail. */
.band{position:relative; border-top:1px solid var(--line);}
.band-inner{
  position:relative;
  border-inline:1px solid var(--line);
  padding-inline:var(--gutter);
}
.band-inner::before,
.band-inner::after{
  content:''; position:absolute; top:-6px; width:11px; height:11px;
  background:
    linear-gradient(var(--cross),var(--cross)) center / 1px 100% no-repeat,
    linear-gradient(var(--cross),var(--cross)) center / 100% 1px no-repeat;
  pointer-events:none;
}
.band-inner::before{left:-6px;}
.band-inner::after{right:-6px;}

/* ---------- mono labels ---------- */
.tag,.idx,.cat,.btn,.work-item figcaption,.nav-links a{
  font-family:var(--f-mono); font-weight:500;
  text-transform:uppercase; letter-spacing:0.06em;
}
.tag{display:inline-flex; align-items:center; gap:10px; font-size:var(--t-xs); color:var(--ink-2);}
.tag-muted{color:var(--ink-3);}
.sq{display:inline-block; width:7px; height:7px; background:var(--blue); flex:none;}

/* ---------- buttons ----------
   Feedback on press, not release: :active scales immediately. */
.btn{
  display:inline-flex; align-items:center; gap:10px;
  font-size:var(--t-sm);
  padding:14px 20px; border-radius:var(--r-sm);
  border:1px solid transparent;
  cursor:pointer;
  transition:transform .12s var(--ease-press), background-color .25s var(--ease-settle), border-color .25s var(--ease-settle), color .25s var(--ease-settle);
}
.btn:active:not(:disabled){transform:scale(.97);}
.btn span{transition:transform .3s var(--ease-settle);}
.btn:hover span{transform:translateX(3px);}
.btn-primary{background:var(--royal); color:var(--on-royal);}
.btn-primary:hover{background:var(--royal-hi);}
.btn-ghost{border-color:var(--line-strong); color:var(--ink); background:oklch(99.4% 0.003 264 / 0.7);}
.btn-ghost:hover{border-color:var(--ink);}
.btn-sm{padding:10px 14px; font-size:var(--t-xs);}

/* ---------- nav ---------- */
header{
  position:sticky; top:0; z-index:40;
  background:oklch(99.4% 0.003 264 / 0.82);
  backdrop-filter:blur(16px) saturate(160%);
  -webkit-backdrop-filter:blur(16px) saturate(160%);
  border-bottom:1px solid var(--line);
}
.nav{
  display:flex; align-items:center; gap:var(--s-6);
  padding:var(--s-3) var(--gutter);
  border-inline:1px solid var(--line);
}
.brand{display:flex; align-items:center; gap:10px; margin-right:auto;}
.brand-name{font-family:var(--f-display); font-weight:600; font-size:17px; letter-spacing:-0.01em;}
.nav-links{display:flex; gap:var(--s-6);}
.nav-links a{font-size:var(--t-xs); color:var(--ink-2); transition:color .2s var(--ease-settle);}
.nav-links a:hover{color:var(--royal);}

/* ---------- 3D mark canvas (fixed, behind all content) ----------
   mark.js owns geometry and the dither pass. main.js sets --mark-o per
   section so the mark is a full-strength image in the hero and recedes
   to a faint presence wherever body copy needs the contrast. */
#markCanvas{
  position:fixed; inset:0;
  width:100%; height:100%;
  display:block;
  z-index:-1;
  pointer-events:none;
  opacity:0;
  transition:opacity .6s var(--ease-settle);
  -webkit-mask-image:radial-gradient(ellipse 46% 62% at 72% 48%, black 62%, transparent 92%);
  mask-image:radial-gradient(ellipse 46% 62% at 72% 48%, black 62%, transparent 92%);
}
#markCanvas.is-ready{opacity:var(--mark-o, 1);}
html[data-mark-style="metal"] #markCanvas.is-ready{opacity:calc(var(--mark-o, 1) * 0.7);}

/* ---------- hero ---------- */
.hero{border-top:0;}
.hero .band-inner::before,.hero .band-inner::after{display:none;}
.hero .band-inner{
  min-height:calc(100svh - 61px);
  display:flex; flex-direction:column; justify-content:space-between;
  padding-top:clamp(64px, 12vh, 140px);
}
.hero-copy{max-width:720px;}

@keyframes hero-rise{
  from{opacity:0; transform:translateY(24px);}
  to{opacity:1; transform:translateY(0);}
}
.hero-h,.hero-sub,.hero-actions{animation:hero-rise .8s var(--ease-settle) both;}
.hero-sub{animation-delay:.12s;}
.hero-actions{animation-delay:.22s;}

h1.hero-h{
  font-size:var(--t-display);
  line-height:0.98;
  letter-spacing:-0.045em;
  max-width:9.5ch;
}
.hero-sub{
  margin:var(--s-6) 0 0;
  max-width:44ch;
  font-size:var(--t-md);
  line-height:1.6;
  color:var(--ink-2);
}
.hero-actions{margin-top:var(--s-6); display:flex; gap:var(--s-3); flex-wrap:wrap;}
.hero-foot{
  display:flex; justify-content:space-between; gap:var(--s-4); flex-wrap:wrap;
  margin-top:var(--s-9);
  margin-inline:calc(var(--gutter) * -1);
  padding:var(--s-4) var(--gutter);
  border-top:1px solid var(--line);
  position:relative;
}
.hero-foot::before,.hero-foot::after{
  content:''; position:absolute; top:-6px; width:11px; height:11px;
  background:
    linear-gradient(var(--cross),var(--cross)) center / 1px 100% no-repeat,
    linear-gradient(var(--cross),var(--cross)) center / 100% 1px no-repeat;
}
.hero-foot::before{left:-6px;}
.hero-foot::after{right:-6px;}

/* ---------- section heads ---------- */
h2{font-size:var(--t-section); line-height:1.02; letter-spacing:-0.035em;}

/* ---------- services ---------- */
.services-grid{
  display:grid; grid-template-columns:0.9fr 1.5fr;
  gap:var(--s-8); align-items:start;
  padding-block:var(--s-10);
}
.services-intro h2{max-width:10ch;}
.services-intro p{margin:var(--s-5) 0 0; color:var(--ink-2); font-size:var(--t-md); max-width:34ch;}
@media (min-width:961px){ .services-intro{position:sticky; top:120px;} }
.services-list{list-style:none; margin:0; padding:0; border-top:1px solid var(--line);}
.service-row{
  display:grid; grid-template-columns:56px 1fr auto; gap:var(--s-4);
  align-items:baseline;
  padding:var(--s-6) 0;
  border-bottom:1px solid var(--line);
  transition:transform .4s var(--ease-settle), border-color .4s var(--ease-settle);
}
.service-row:hover{transform:translateX(var(--s-3)); border-bottom-color:var(--line-strong);}
.service-row h3{font-size:clamp(22px, 2.2vw, 28px); letter-spacing:-0.02em; line-height:1.15;}
.service-row p{margin:var(--s-2) 0 0; color:var(--ink-2); max-width:50ch;}
.idx{font-size:var(--t-xs); color:var(--blue);}
.cat{font-size:var(--t-xs); color:var(--royal); border:1px solid var(--blue-100); padding:4px 8px; border-radius:var(--r-sm); white-space:nowrap;}

/* ---------- work ---------- */
.work-head{padding-top:var(--s-10); display:flex; justify-content:space-between; align-items:end; gap:var(--s-6); flex-wrap:wrap;}
.work-head h2{max-width:11ch;}
.work-note{margin:0; color:var(--ink-3); font-size:var(--t-sm); max-width:40ch;}
.work-grid{
  margin-top:var(--s-7); padding-bottom:var(--s-10);
  display:grid; grid-template-columns:1.3fr 1fr 1fr; grid-template-rows:auto auto;
  gap:var(--s-3);
}
.work-item{
  margin:0; border-radius:var(--r-md); overflow:hidden; position:relative;
  background:var(--paper-3); aspect-ratio:4 / 5;
}
.work-item--lg{grid-row:1 / 3; aspect-ratio:auto;}
.work-item img{width:100%; height:100%; object-fit:cover; transition:transform .7s var(--ease-settle);}
.work-item:hover img{transform:scale(1.035);}
.work-item figcaption{
  position:absolute; left:var(--s-3); bottom:var(--s-3);
  font-size:11px; color:var(--ink);
  background:oklch(99.4% 0.003 264 / 0.92);
  padding:6px 9px; border-radius:var(--r-sm);
}

/* ---------- process ---------- */
#process .band-inner{padding-block:var(--s-10);}
#process h2{margin-bottom:var(--s-8);}
.process-steps{
  list-style:none; margin:0; padding:0;
  display:grid; grid-template-columns:repeat(4, 1fr); gap:var(--s-5);
  position:relative;
}
.process-steps::before{content:''; position:absolute; top:3px; left:0; right:0; height:1px; background:var(--line);}
/* Draws once on scroll-in: explains the four steps are one sequence. */
.process-steps::after{
  content:''; position:absolute; top:3px; left:0; width:100%; height:1px;
  background:var(--royal);
  transform:scaleX(0); transform-origin:0 50%;
  transition:transform 1.1s var(--ease-settle);
}
.process-steps.is-drawn::after{transform:scaleX(1);}
.process-steps li{position:relative; padding-top:var(--s-6);}
.process-steps li::before{content:''; position:absolute; top:0; left:0; width:7px; height:7px; background:var(--royal);}
.process-steps h3{font-size:var(--t-lg); letter-spacing:-0.02em; margin:var(--s-2) 0;}
.process-steps p{margin:0; font-size:var(--t-sm); line-height:1.6; color:var(--ink-2);}

/* ---------- strip (the one drenched moment) ---------- */
.strip{background:var(--royal); color:var(--on-royal); border-top-color:transparent; overflow:hidden;}
.strip .band-inner{border-color:oklch(99% 0.006 264 / 0.16);}
.strip .band-inner::before,.strip .band-inner::after{display:none;}
/* square pixel field, fading in toward the right: the dither language in CSS */
.strip::before{
  content:''; position:absolute; inset:0;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='8' height='8'%3E%3Crect width='5' height='5' fill='%23C7D7FE'/%3E%3C/svg%3E");
  opacity:.32;
  -webkit-mask-image:linear-gradient(105deg, transparent 42%, black 100%);
  mask-image:linear-gradient(105deg, transparent 42%, black 100%);
  pointer-events:none;
}
.strip-inner{display:flex; gap:var(--s-8); align-items:flex-start; flex-wrap:wrap; padding-block:var(--s-9);}
.strip h2{font-size:clamp(30px,3.6vw,46px); max-width:15ch; flex:1 1 320px;}
.strip p{font-size:var(--t-md); line-height:1.7; color:oklch(93% 0.03 264); max-width:52ch; margin:0; flex:1 1 380px;}

/* ---------- form ---------- */
.form-section{border-top-color:transparent;}
.form-shell{display:grid; grid-template-columns:0.85fr 1.3fr; gap:var(--s-8); align-items:start; padding-block:var(--s-10);}
.form-head p{margin:var(--s-5) 0 0; color:var(--ink-2); font-size:var(--t-md); max-width:40ch;}
.form-head .tag{margin-top:var(--s-6); font-size:var(--t-xs); color:var(--ink-3);}
@media (min-width:961px){ .form-head{position:sticky; top:120px;} }

form{
  background:var(--paper-2);
  border:1px solid var(--line-strong);
  border-radius:var(--r-md);
  padding:var(--s-7);
}
.grid-2{display:grid; grid-template-columns:1fr 1fr; gap:var(--s-4) var(--s-5);}
.field{margin-bottom:var(--s-5);}
.field label{display:block; font-size:var(--t-sm); font-weight:500; color:var(--ink-2); margin-bottom:var(--s-2);}
.field input[type=text],
.field input[type=email],
.field input[type=tel],
.field select,
.field textarea{
  width:100%;
  background:var(--paper);
  border:1px solid var(--line-strong);
  border-radius:var(--r-sm);
  padding:12px 14px;
  color:var(--ink);
  font-family:var(--f-body); font-size:var(--t-base);
  transition:border-color .2s var(--ease-settle), box-shadow .2s var(--ease-settle);
}
.field input::placeholder,.field textarea::placeholder{color:var(--ink-3);}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none; border-color:var(--royal); box-shadow:0 0 0 3px oklch(65.5% 0.185 263 / 0.22);
}
.field textarea{min-height:110px; resize:vertical; line-height:1.6;}
.field select{
  appearance:none; cursor:pointer;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%235F6676' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat; background-position:right 14px center;
}
.field[data-invalid] input,.field[data-invalid] select,.field[data-invalid] textarea{border-color:var(--danger);}
.field-error{display:none; margin:var(--s-2) 0 0; font-size:var(--t-xs); color:var(--danger); line-height:1.5;}
.field[data-invalid] .field-error{display:block;}

.checks{display:grid; grid-template-columns:1fr 1fr; gap:var(--s-2) var(--s-3);}
.check-item{
  display:flex; align-items:center; gap:9px;
  font-size:var(--t-sm); color:var(--ink-2);
  background:var(--paper);
  border:1px solid var(--line-strong); border-radius:var(--r-sm); padding:11px 12px;
  cursor:pointer;
  transition:border-color .2s var(--ease-settle), color .2s var(--ease-settle), background-color .2s var(--ease-settle);
}
.check-item:hover{border-color:var(--ink-3); color:var(--ink);}
.check-item:has(input:checked){border-color:var(--royal); color:var(--ink); background:var(--blue-100);}
.check-item input{accent-color:var(--royal); flex:none;}

.hp{position:absolute; left:-9999px; width:1px; height:1px; opacity:0;}

.submit-row{margin-top:var(--s-2);}
.submit-btn{width:100%; justify-content:center; padding:17px 20px;}
.submit-btn:disabled{opacity:.6; cursor:progress;}
.form-fine{margin:var(--s-4) 0 0; font-size:var(--t-xs); color:var(--ink-3); text-align:center; line-height:1.55;}

.form-alert{
  display:none; margin-top:var(--s-4);
  border:1px solid var(--danger); background:oklch(52% 0.17 28 / 0.07);
  border-radius:var(--r-sm); padding:var(--s-4) var(--s-5);
  font-size:var(--t-sm); line-height:1.6;
}
.form-alert a{color:var(--royal); text-decoration:underline; text-underline-offset:2px;}

.success{
  display:none; text-align:center;
  padding:var(--s-9) var(--s-7);
  background:var(--paper-2); border:1px solid var(--royal); border-radius:var(--r-md);
}
.success h3{font-size:28px; letter-spacing:-0.02em; margin-bottom:var(--s-3);}
.success p{color:var(--ink-2); font-size:var(--t-md); margin:0 auto; max-width:44ch;}

/* ---------- footer ---------- */
.foot-inner{display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:var(--s-4); padding-block:var(--s-6);}
.foot-brand{display:flex; align-items:center; gap:10px; font-size:var(--t-sm); color:var(--ink-3);}
.foot-links{display:flex; gap:var(--s-5); font-size:var(--t-sm); color:var(--ink-3);}
.foot-links a{transition:color .2s var(--ease-settle);}
.foot-links a:hover{color:var(--royal);}

/* ---------- scroll reveal ---------- */
.reveal{
  opacity:0; transform:translateY(12px);
  transition:opacity .5s var(--ease-settle), transform .5s var(--ease-settle);
  transition-delay:calc(min(var(--i, 0), 4) * 70ms);
}
.reveal.is-in{opacity:1; transform:none;}

/* ---------- responsive ---------- */
@media (max-width:960px){
  :root{--gutter:28px;}
  .services-grid,.form-shell{grid-template-columns:1fr; gap:var(--s-6); padding-block:var(--s-9);}
  .work-grid{grid-template-columns:1fr 1fr;}
  .process-steps{grid-template-columns:1fr 1fr; gap:var(--s-7) var(--s-5);}
  .process-steps::before,.process-steps::after{display:none;}
  #markCanvas{
    -webkit-mask-image:radial-gradient(ellipse 60% 40% at 70% 30%, black 50%, transparent 90%);
    mask-image:radial-gradient(ellipse 60% 40% at 70% 30%, black 50%, transparent 90%);
  }
}
@media (max-width:720px){
  .nav-links{display:none;}
  .nav{gap:var(--s-4);}
}
@media (max-width:640px){
  :root{--gutter:18px;}
  .band-inner,.nav{border-inline:0;}
  .band-inner::before,.band-inner::after,.hero-foot::before,.hero-foot::after{display:none;}
  .grid-2,.checks{grid-template-columns:1fr;}
  form{padding:var(--s-5);}
  .hero-foot{margin-top:var(--s-8);}
  .service-row{grid-template-columns:36px 1fr;}
  .service-row .cat{grid-column:2; justify-self:start;}
  .work-grid{grid-template-columns:1fr;}
  .work-item--lg{grid-row:auto; aspect-ratio:4 / 5;}
  .process-steps{grid-template-columns:1fr;}
  .strip-inner{flex-direction:column; gap:var(--s-4);}
  .strip h2,.strip p{flex:1 1 auto;}
  /* single column: mark.js drops the A into the hero's lower half,
     below the copy; the mask keeps it there */
  #markCanvas{
    -webkit-mask-image:radial-gradient(ellipse 80% 24% at 50% 80%, black 60%, transparent 95%);
    mask-image:radial-gradient(ellipse 80% 24% at 50% 80%, black 60%, transparent 95%);
  }
  .hero-foot{flex-direction:column; gap:var(--s-2);}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important;}
  .reveal{opacity:1; transform:none;}
  .hero-h,.hero-sub,.hero-actions{animation:none; opacity:1; transform:none;}
  .process-steps::after{transform:scaleX(1);}
}
@media (prefers-reduced-transparency: reduce){
  header{background:var(--paper); backdrop-filter:none; -webkit-backdrop-filter:none;}
}
@media (prefers-contrast: more){
  :root{--line:oklch(16% 0.012 264 / 0.3); --line-strong:oklch(16% 0.012 264 / 0.55);}
}