/* ============================================================
   Acculyst Tech — Foundation
   Design system: "Signal & Paper"
   Tokens, base, header, footer, buttons, chips, shared blocks
   ============================================================ */

/* ---------- Tokens ---------- */
:root{
  --ink:#101116;
  --cobalt:#4B5CFF;
  --cobalt-deep:#3947D9;
  --lime:#D6FF4D;
  --paper:#F6F1E8;
  --lilac:#D9D2FF;
  --coral:#FF6959;
  --graphite:#292C33;
  --white:#FFFFFF;
  --ink-70:rgba(16,17,22,.7);
  --ink-12:rgba(16,17,22,.12);
  --white-70:rgba(255,255,255,.72);
  --white-16:rgba(255,255,255,.16);

  --font-display:"Bricolage Grotesque","Sora",system-ui,-apple-system,sans-serif;
  --font-body:"DM Sans","Inter",system-ui,-apple-system,sans-serif;

  --size-display-xl:clamp(2.75rem,1.5rem + 5.2vw,5.5rem);
  --size-display-l:clamp(2.375rem,1.6rem + 3.2vw,4rem);
  --size-h2:clamp(1.875rem,1.45rem + 1.8vw,2.75rem);
  --size-h3:clamp(1.3125rem,1.2rem + .45vw,1.625rem);
  --size-body-l:clamp(1.125rem,1.05rem + .3vw,1.25rem);
  --size-body:1.0625rem;
  --size-label:.8125rem;

  --space-section:clamp(4rem,3rem + 4vw,6.5rem);
  --space-block:clamp(2rem,1.5rem + 2vw,3rem);

  --radius-ui:10px;
  --radius-chip:999px;

  --container:1200px;
  --gutter:clamp(1.25rem,4vw,2rem);

  --ease-quick:150ms cubic-bezier(.4,0,.2,1);
  --ease-reveal:520ms cubic-bezier(.22,.8,.32,1);
}

/* ---------- Base ---------- */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:var(--size-body);
  line-height:1.6;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.05;margin:0 0 .6em;font-weight:700;letter-spacing:-.01em}
h1{font-size:var(--size-display-xl);line-height:.98;letter-spacing:-.02em}
h2{font-size:var(--size-h2)}
h3{font-size:var(--size-h3);font-weight:600;line-height:1.2}
p{margin:0 0 1em}
a{color:var(--cobalt)}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:3px solid var(--cobalt);outline-offset:3px;border-radius:2px}
.on-ink :focus-visible{outline-color:var(--lime)}
::selection{background:var(--cobalt);color:var(--white)}

.container{max-width:var(--container);margin:0 auto;padding-inline:var(--gutter)}
.section{padding-block:var(--space-section)}

/* Skip link */
.skip-link{
  position:absolute;left:1rem;top:-4rem;z-index:200;
  background:var(--ink);color:var(--white);padding:.7rem 1.1rem;
  border-radius:var(--radius-ui);text-decoration:none;font-weight:500;
  transition:top var(--ease-quick);
}
.skip-link:focus{top:1rem}

/* ---------- Type utilities ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:.55rem;
  font-size:var(--size-label);font-weight:500;letter-spacing:.08em;
  text-transform:uppercase;color:var(--graphite);margin-bottom:1.1rem;
}
.eyebrow::before{
  content:"";width:7px;height:7px;border-radius:50%;background:var(--cobalt);flex:none;
}
.on-ink .eyebrow{color:var(--white-70)}
.on-ink .eyebrow::before{background:var(--lime)}
.lead{font-size:var(--size-body-l);color:var(--graphite);max-width:34em}
.on-ink .lead{color:var(--white-70)}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  font-family:var(--font-body);font-size:1rem;font-weight:500;line-height:1;
  padding:.95rem 1.6rem;border-radius:var(--radius-ui);
  text-decoration:none;border:1.5px solid transparent;cursor:pointer;
  transition:background var(--ease-quick),color var(--ease-quick),border-color var(--ease-quick),transform var(--ease-quick);
  min-height:48px;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--cobalt);color:var(--white);border-color:var(--cobalt)}
.btn-primary:hover{background:var(--lime);color:var(--ink);border-color:var(--lime)}
.btn-secondary{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn-secondary:hover{background:var(--ink);color:var(--white)}
.on-ink .btn-secondary{color:var(--white);border-color:var(--white-70)}
.on-ink .btn-secondary:hover{background:var(--white);color:var(--ink);border-color:var(--white)}
.link-arrow{
  display:inline-flex;align-items:center;gap:.4rem;
  color:var(--cobalt);font-weight:500;text-decoration:none;
}
.link-arrow::after{content:"→";transition:transform var(--ease-quick)}
.link-arrow:hover::after{transform:translateX(4px)}
.link-arrow:hover{text-decoration:underline;text-underline-offset:3px}
.on-ink .link-arrow{color:var(--lime)}

/* ---------- Chips / status labels ---------- */
.chip{
  display:inline-flex;align-items:center;gap:.5rem;
  font-size:var(--size-label);font-weight:500;line-height:1;
  padding:.55rem .95rem;border-radius:var(--radius-chip);
  border:1px solid var(--ink-12);background:var(--white);color:var(--ink);
}
.chip::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--cobalt);flex:none}
.on-ink .chip{background:transparent;border-color:var(--white-16);color:var(--white)}
.on-ink .chip::before{background:var(--lime)}
.status-tag{
  display:inline-flex;align-items:center;gap:.45rem;
  font-size:.72rem;font-weight:700;letter-spacing:.09em;text-transform:uppercase;
  line-height:1;padding:.4rem .7rem;border-radius:var(--radius-chip);
  background:var(--ink);color:var(--lime);
}
.status-tag::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--lime);flex:none}

/* ---------- Dark section helper ---------- */
.on-ink{background:var(--ink);color:var(--white)}
.on-ink h2,.on-ink h3{color:var(--white)}
.on-ink p{color:var(--white-70)}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:var(--paper);
  border-bottom:1px solid var(--ink-12);
  transition:box-shadow var(--ease-quick);
}
.site-header.is-scrolled{box-shadow:0 4px 24px rgba(16,17,22,.08)}
.header-inner{
  display:flex;align-items:center;gap:1.25rem;
  min-height:72px;
}
.brand{
  display:inline-flex;align-items:center;
  text-decoration:none;line-height:1;
  margin-right:auto;
}
.brand img{display:block;height:40px;width:auto}
@media (max-width:480px){
  .brand img{height:34px}
}
.primary-nav{display:flex;align-items:center;gap:.25rem}
.primary-nav a{
  color:var(--ink);text-decoration:none;font-weight:500;font-size:.95rem;
  padding:.55rem .75rem;border-radius:8px;
  transition:background var(--ease-quick),color var(--ease-quick);
}
.primary-nav a:hover{background:var(--ink);color:var(--white)}
.primary-nav a[aria-current="page"]{color:var(--cobalt)}
.header-cta{margin-left:.5rem}
.nav-toggle{
  display:none;
  background:none;border:1.5px solid var(--ink);border-radius:var(--radius-ui);
  width:48px;height:48px;cursor:pointer;color:var(--ink);
  align-items:center;justify-content:center;
}
.nav-toggle svg{width:22px;height:22px}
.nav-toggle .icon-close{display:none}
.nav-toggle[aria-expanded="true"] .icon-open{display:none}
.nav-toggle[aria-expanded="true"] .icon-close{display:block}

/* Mobile menu overlay */
.mobile-menu{
  display:none;
  position:fixed;inset:72px 0 0 0;z-index:99;
  background:var(--ink);color:var(--white);
  padding:2rem var(--gutter) 2rem;
  flex-direction:column;
  overflow-y:auto;
}
.mobile-menu.is-open{display:flex}
.mobile-menu nav{display:flex;flex-direction:column;gap:.25rem;flex:1}
.mobile-menu nav a{
  font-family:var(--font-display);font-size:1.75rem;font-weight:600;
  color:var(--white);text-decoration:none;padding:.65rem 0;
  border-bottom:1px solid var(--white-16);
}
.mobile-menu nav a:hover{color:var(--lime)}
.mobile-menu .btn{width:100%;margin-top:1.5rem}
body.menu-open{overflow:hidden}

@media (max-width:920px){
  .primary-nav,.header-cta{display:none}
  .nav-toggle{display:inline-flex}
}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:var(--white);padding-top:var(--space-section)}
.footer-grid{
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:2.5rem;
  padding-bottom:3rem;border-bottom:1px solid var(--white-16);
}
.footer-brand .brand{color:var(--white);margin:0 0 1rem}
.footer-brand p{color:var(--white-70);max-width:26em;font-size:.95rem}
.footer-col-title{
  font-family:var(--font-body);font-size:var(--size-label);font-weight:500;
  letter-spacing:.08em;text-transform:uppercase;color:var(--white-70);margin:0 0 1rem;
}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;
}
.footer-col ul{display:flex;flex-direction:column;gap:.6rem}
.footer-col a{color:var(--white);text-decoration:none;font-size:.95rem}
.footer-col a:hover{color:var(--lime);text-decoration:underline;text-underline-offset:3px}
.footer-contact li{color:var(--white-70);font-size:.95rem}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between;align-items:center;
  padding-block:1.5rem;
}
.footer-bottom p{margin:0;color:var(--white-70);font-size:.85rem}
.footer-social{display:flex;gap:1rem}
.footer-social a{color:var(--white-70);text-decoration:none;font-size:.85rem;font-weight:500}
.footer-social a:hover{color:var(--lime)}
@media (max-width:860px){
  .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(18px);transition:opacity var(--ease-reveal),transform var(--ease-reveal)}
.reveal.is-visible{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation:none!important;transition-duration:.01ms!important}
}

/* ---------- Sticky mobile CTA ---------- */
.sticky-cta{
  display:none;
  position:fixed;left:0;right:0;bottom:0;z-index:90;
  padding:.75rem var(--gutter) calc(.75rem + env(safe-area-inset-bottom));
  background:rgba(246,241,232,.92);backdrop-filter:blur(8px);
  border-top:1px solid var(--ink-12);
  transform:translateY(110%);transition:transform 240ms cubic-bezier(.22,.8,.32,1);
}
.sticky-cta .btn{width:100%}
.sticky-cta.is-active{transform:none}
@media (max-width:700px){
  .sticky-cta{display:block}
}