/* ============================================================
   ZynthLabs — style.css
   Palette drawn from the brand mark:
   ink #04050f · raise #0a0d1f · blue #2f5cff · violet #a03bf5
   ============================================================ */

:root{
  --ink:#04050f;
  --raise:#0a0d1f;
  --line:rgba(132,142,255,.16);
  --blue:#2f5cff;
  --violet:#a03bf5;
  --text:#eef0fa;
  --mut:#9aa1c0;
  --grad:linear-gradient(100deg,var(--blue),var(--violet));
  --font-d:"Sora",sans-serif;
  --font-b:"Inter",sans-serif;
  --nav-h:72px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){ html{scroll-behavior:auto} }

body{
  margin:0;
  background:var(--ink);
  color:var(--text);
  font:400 17px/1.65 var(--font-b);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img{max-width:100%;display:block}
a{color:inherit}

h1,h2,h3{font-family:var(--font-d);margin:0;letter-spacing:-.015em}

.wrap{max-width:1140px;margin:0 auto;padding:0 24px}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  font:600 15px/1 var(--font-d);
  color:#fff;text-decoration:none;cursor:pointer;
  padding:15px 26px;border-radius:999px;border:0;
  background:var(--grad);
  transition:transform .18s ease, box-shadow .18s ease;
}
.btn:hover{transform:translateY(-1px);box-shadow:0 8px 28px rgba(80,80,245,.35)}
.btn:active{transform:translateY(0)}
.btn-ghost{
  background:transparent;
  border:1px solid rgba(160,168,255,.35);
  color:var(--text);
}
.btn-ghost:hover{box-shadow:none;border-color:rgba(160,168,255,.7);background:rgba(90,100,255,.08)}
.btn-small{padding:11px 20px;font-size:14px}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:4px}

/* ---------- nav ---------- */
.nav{
  position:fixed;inset:0 0 auto 0;z-index:50;
  height:var(--nav-h);
  display:flex;align-items:center;gap:36px;
  padding:0 28px;
  transition:background .25s ease, border-color .25s ease, backdrop-filter .25s ease;
  border-bottom:1px solid transparent;
}
.nav.scrolled{
  background:rgba(5,6,18,.72);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom-color:var(--line);
}
.nav-brand{display:flex;align-items:center;gap:11px;text-decoration:none}
.nav-mark{height:26px;width:auto}
.nav-word{font:600 19px/1 var(--font-d);letter-spacing:-.01em}
.nav-word em{font-style:normal;font-weight:300;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav-links{display:flex;gap:28px;margin-left:auto}
.nav-links a{
  font:500 14.5px/1 var(--font-b);color:var(--mut);text-decoration:none;
  transition:color .15s ease;
}
.nav-links a:hover{color:var(--text)}
.nav-toggle{display:none}

/* mobile sheet */
.nav-sheet{
  position:fixed;inset:var(--nav-h) 0 auto 0;z-index:49;
  background:rgba(6,7,20,.97);border-bottom:1px solid var(--line);
  display:none;flex-direction:column;padding:10px 28px 26px;
}
.nav-sheet.open{display:flex}
.nav-sheet a{
  padding:15px 0;text-decoration:none;color:var(--text);
  font:500 17px/1 var(--font-d);border-bottom:1px solid rgba(132,142,255,.08);
}
.nav-sheet .sheet-cta{color:transparent;background:var(--grad);
  -webkit-background-clip:text;background-clip:text;border-bottom:0}

@media (max-width:860px){
  .nav{gap:0;padding:0 20px}
  .nav-links,.nav .btn{display:none}
  .nav-toggle{
    display:flex;flex-direction:column;gap:6px;margin-left:auto;
    background:none;border:0;padding:10px;cursor:pointer;
  }
  .nav-toggle span{width:22px;height:2px;background:var(--text);transition:transform .2s ease, opacity .2s ease}
  .nav-toggle[aria-expanded="true"] span:first-child{transform:translateY(4px) rotate(45deg)}
  .nav-toggle[aria-expanded="true"] span:last-child{transform:translateY(-4px) rotate(-45deg)}
}

/* ---------- scroll stage (hero + chapters) ---------- */
.stage{height:420vh;position:relative}
.stage-pin{
  position:sticky;top:0;height:100vh;height:100svh;overflow:hidden;
}
#scene{position:absolute;inset:0;width:100%;height:100%;display:block}
.stage-veil{
  position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(120% 90% at 50% 110%, rgba(4,5,15,.9) 0%, rgba(4,5,15,0) 45%),
    radial-gradient(90% 70% at 50% -10%, rgba(47,92,255,.12) 0%, rgba(4,5,15,0) 55%);
}

.stage-copy{
  position:absolute;inset:0;
  display:flex;flex-direction:column;justify-content:center;align-items:flex-start;
  max-width:1140px;margin:0 auto;padding:0 24px;
  opacity:0;visibility:hidden;
  transition:opacity .35s ease, visibility .35s ease;
  pointer-events:none;
}
.stage-copy.on{opacity:1;visibility:visible;pointer-events:auto}

.hero-copy h1{
  font-size:clamp(42px,7vw,84px);
  font-weight:700;line-height:1.04;
  max-width:11em;
}
.hero-copy p{
  margin:26px 0 0;max-width:33em;
  font-size:clamp(16px,1.6vw,19px);color:var(--mut);
}
.hero-actions{display:flex;gap:14px;margin-top:38px;flex-wrap:wrap}

.hero-hint{
  position:absolute;left:50%;bottom:34px;transform:translateX(-50%);
  width:24px;height:40px;border:1.5px solid rgba(160,168,255,.4);border-radius:14px;
}
.hero-hint span{
  position:absolute;left:50%;top:7px;width:3px;height:8px;margin-left:-1.5px;
  border-radius:2px;background:var(--mut);
  animation:hint 1.8s ease-in-out infinite;
}
@keyframes hint{0%{transform:translateY(0);opacity:1}70%{transform:translateY(14px);opacity:0}100%{opacity:0}}

.hero-copy h1,.chapter h2{text-shadow:0 2px 34px rgba(4,5,15,.85)}
.chapter h2{
  font-size:clamp(34px,4.6vw,58px);font-weight:700;line-height:1.08;
  background:linear-gradient(100deg,#fff 30%,#b9c2ff);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.chapter p{
  margin:20px 0 0;max-width:27em;
  font-size:clamp(16px,1.6vw,19px);color:var(--mut);
}
/* alternate chapter alignment so the object gets room */
.stage-copy[data-chapter="2"]{align-items:flex-end;text-align:right}
.stage-copy[data-chapter="2"] p{margin-left:auto}

@media (max-width:700px){
  .stage-copy[data-chapter="2"]{align-items:flex-start;text-align:left}
  .stage-copy[data-chapter="2"] p{margin-left:0}
  .stage-copy{justify-content:flex-end;padding-bottom:16vh}
}

/* page-load sequence */
.hero-copy h1,.hero-copy p,.hero-actions{opacity:0;transform:translateY(18px)}
body.ready .hero-copy h1{animation:rise .8s .15s cubic-bezier(.2,.7,.2,1) forwards}
body.ready .hero-copy p{animation:rise .8s .3s cubic-bezier(.2,.7,.2,1) forwards}
body.ready .hero-actions{animation:rise .8s .45s cubic-bezier(.2,.7,.2,1) forwards}
@keyframes rise{to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){
  .hero-copy h1,.hero-copy p,.hero-actions{opacity:1;transform:none;animation:none !important}
  .hero-hint span{animation:none}
  .stage{height:auto}
  .stage-pin{position:relative;height:auto;min-height:100vh}
  .stage-copy{position:relative;opacity:1;visibility:visible;pointer-events:auto;padding-top:120px;padding-bottom:60px;height:auto}
  .stage-copy.chapter{min-height:0}
  #scene{position:absolute;height:100%;opacity:.5}
}

/* no-WebGL fallback: stage becomes normal stacked sections */
body.no3d .stage{height:auto}
body.no3d .stage-pin{position:relative;height:auto;min-height:0}
body.no3d #scene{display:none}
body.no3d .stage-copy{
  position:relative;opacity:1;visibility:visible;pointer-events:auto;
  height:auto;padding-top:0;padding-bottom:90px;
}
body.no3d .hero-copy{padding-top:190px;padding-bottom:110px}
body.no3d .stage-veil{position:absolute}

/* ---------- sections ---------- */
.section{padding:130px 0;position:relative}
.section-alt{
  background:
    radial-gradient(70% 120% at 80% 0%, rgba(160,59,245,.06), transparent 60%),
    var(--raise);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.section-title{
  font-size:clamp(30px,3.8vw,48px);font-weight:700;line-height:1.12;
  max-width:16em;
}
.section-lede{color:var(--mut);max-width:36em;margin:18px 0 0;font-size:18px}

/* capabilities */
.cap-grid{
  margin-top:64px;
  display:grid;grid-template-columns:repeat(3,1fr);
  border-top:1px solid var(--line);
  border-left:1px solid var(--line);
}
.cap{
  padding:36px 32px 42px;
  border-right:1px solid var(--line);
  border-bottom:1px solid var(--line);
  position:relative;
  transition:background .25s ease;
}
.cap::before{
  content:"";position:absolute;left:32px;top:0;height:2px;width:34px;
  background:var(--grad);opacity:.85;
}
.cap:hover{background:rgba(70,80,255,.05)}
.cap h3{font-size:20px;font-weight:600;margin-top:18px}
.cap p{color:var(--mut);font-size:15.5px;margin:12px 0 0}
@media (max-width:980px){.cap-grid{grid-template-columns:1fr 1fr}}
@media (max-width:640px){.cap-grid{grid-template-columns:1fr}}

/* process */
.steps{
  list-style:none;margin:64px 0 0;padding:0;
  display:grid;grid-template-columns:repeat(4,1fr);gap:40px;
}
.steps li{display:flex;flex-direction:column;gap:18px}
.step-n{
  font:300 44px/1 var(--font-d);
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.steps h3{font-size:19px;font-weight:600}
.steps p{color:var(--mut);font-size:15.5px;margin:10px 0 0}
@media (max-width:980px){.steps{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.steps{grid-template-columns:1fr}}

/* about */
.about-wrap{display:grid;grid-template-columns:1.4fr 1fr;gap:72px;align-items:start}
.about-copy p{color:var(--mut);margin:22px 0 0;max-width:36em}
.about-copy p:first-of-type{margin-top:26px;color:var(--text)}
.about-facts{
  list-style:none;margin:10px 0 0;padding:0;
  border-top:1px solid var(--line);
}
.about-facts li{
  display:flex;flex-direction:column;gap:3px;
  padding:20px 0;border-bottom:1px solid var(--line);
}
.about-facts strong{font:600 13px/1.4 var(--font-b);color:var(--mut)}
.about-facts span{font:500 16px/1.5 var(--font-b)}
@media (max-width:860px){.about-wrap{grid-template-columns:1fr;gap:40px}}

/* ---------- contact ---------- */
.contact-wrap{display:grid;grid-template-columns:1fr 1.35fr;gap:72px;align-items:start}
.contact-list{list-style:none;margin:40px 0 0;padding:0}
.contact-list li{
  display:flex;flex-direction:column;gap:4px;
  padding:20px 0;border-top:1px solid var(--line);
}
.contact-list strong{font:600 13px/1.4 var(--font-b);color:var(--mut)}
.contact-list a{font:500 17px/1.5 var(--font-b);text-decoration:none}
.contact-list a:hover{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

.contact-form{display:flex;flex-direction:column;gap:22px}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:22px}
@media (max-width:620px){.field-row{grid-template-columns:1fr}}

.field{display:flex;flex-direction:column;gap:9px;border:0;margin:0;padding:0;min-width:0}
.field>span,.field legend{
  font:500 14px/1.4 var(--font-b);color:var(--text);padding:0;
}
.field small,.consent small{color:var(--mut);font-weight:400}
.field legend{margin-bottom:9px}
input[type=text],input[type=email],input[type=tel],textarea{
  width:100%;
  background:rgba(10,13,31,.7);
  border:1px solid rgba(132,142,255,.22);
  border-radius:12px;
  padding:14px 16px;
  color:var(--text);
  font:400 16px/1.5 var(--font-b);
  transition:border-color .15s ease, box-shadow .15s ease;
}
input:focus,textarea:focus{
  outline:none;border-color:var(--blue);
  box-shadow:0 0 0 3px rgba(47,92,255,.2);
}
textarea{resize:vertical;min-height:120px}

.choice-row{display:flex;flex-wrap:wrap;gap:10px}
.chip{position:relative;cursor:pointer}
.chip input{position:absolute;opacity:0;pointer-events:none}
.chip span{
  display:inline-block;
  padding:10px 18px;border-radius:999px;
  border:1px solid rgba(132,142,255,.28);
  font:500 14px/1 var(--font-b);color:var(--mut);
  transition:all .15s ease;
}
.chip input:checked+span{
  color:#fff;border-color:transparent;
  background:var(--grad);
}
.chip input:focus-visible+span{outline:2px solid var(--blue);outline-offset:2px}
.chip:hover span{border-color:rgba(160,168,255,.6);color:var(--text)}
.chip input:checked:hover+span{color:#fff}

.hp{position:absolute !important;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}

.consent{display:flex;gap:12px;align-items:flex-start;color:var(--mut);font-size:14px;cursor:pointer}
.consent input{margin-top:3px;accent-color:var(--blue);width:17px;height:17px;flex:none}

.btn-submit{align-self:flex-start;min-width:190px}
.btn-submit[disabled]{opacity:.6;cursor:wait;transform:none;box-shadow:none}
.form-note{min-height:1.4em;margin:0;font-size:14.5px;color:#ff8d9d}
.form-note.ok{color:#8ef0c0}

.form-done{
  grid-column:2;
  border:1px solid var(--line);border-radius:20px;
  background:rgba(10,13,31,.7);
  padding:48px 44px;
}
.form-done h3{
  font-size:26px;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.form-done p{color:var(--mut);margin:14px 0 26px;max-width:30em}
@media (max-width:860px){
  .contact-wrap{grid-template-columns:1fr;gap:48px}
  .form-done{grid-column:1}
}

/* ---------- footer ---------- */
.footer{
  padding:76px 0 36px;
  border-top:1px solid var(--line);
  background:
    radial-gradient(60% 110% at 15% 0%, rgba(47,92,255,.07), transparent 60%),
    var(--raise);
}
.footer-wrap{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr;
  gap:48px;
  align-items:start;
}
.footer-brand p{color:var(--mut);font-size:14.5px;margin:22px 0 0;line-height:1.75;max-width:30em}
.footer-col{display:flex;flex-direction:column;gap:14px}
.footer-col nav{display:flex;flex-direction:column;gap:13px}
.footer-col strong{
  font:600 13px/1.4 var(--font-b);color:var(--mut);
  padding-bottom:6px;border-bottom:1px solid var(--line);
  margin-bottom:4px;
}
.footer-col a,.footer-col span{
  color:var(--text);text-decoration:none;font-size:14.5px;
  transition:color .15s ease;
}
.footer-col span{color:var(--mut)}
.footer-col a:hover{
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;
}
.footer-base{
  margin-top:60px;padding-top:24px;
  border-top:1px solid rgba(132,142,255,.09);
  color:#6a7094;font-size:13px;
}
@media (max-width:860px){
  .footer-wrap{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:520px){
  .footer-wrap{grid-template-columns:1fr}
}