/* ============================================================
   ZYRON LABORATORY — main.css
   Design tokens derived exclusively from the official brand:
   Petrol #0090AD · Cyan #00D0D4 · White #FFFFFF · Gray #848688
   Typeface: Montserrat (official institutional typography)
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  --petrol: #0090AD;
  --cyan: #00D0D4;
  --white: #FFFFFF;
  --gray: #848688;

  /* Deep shades of the petrol hue (brand-derived darks) */
  --bg-0: #030F14;
  --bg-1: #041820;
  --bg-2: #06222C;

  --text-hi: var(--white);
  --text-mid: rgba(255, 255, 255, 0.70);
  --text-low: rgba(255, 255, 255, 0.52); /* ≥4.5:1 on --bg-0 (WCAG AA) */

  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.16);

  --glass-bg: rgba(6, 34, 44, 0.38);
  --glass-border: rgba(255, 255, 255, 0.09);

  --grad-brand: linear-gradient(120deg, var(--cyan), var(--petrol));
  --grad-text: linear-gradient(100deg, var(--white) 10%, var(--cyan) 55%, var(--petrol) 105%);

  --font: "Montserrat", "Segoe UI", system-ui, -apple-system, sans-serif;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-io: cubic-bezier(0.65, 0, 0.35, 1);

  --container: 1240px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --nav-h: 84px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}
html.lenis, html.lenis body { height: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }

body {
  font-family: var(--font);
  font-weight: 400;
  background: var(--bg-0);
  color: var(--text-hi);
  line-height: 1.6;
  overflow-x: clip;
  min-height: 100vh;
  min-height: 100svh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Film grain (SVG turbulence) */
body::after {
  content: "";
  position: fixed;
  inset: -50%;
  width: 200%;
  height: 200%;
  pointer-events: none;
  z-index: 2000;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul[role="list"] { list-style: none; }

::selection { background: var(--cyan); color: #03252B; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
  border-radius: 4px;
}

/* Subtle brand scrollbar */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb { background: #123a46; border-radius: 8px; border: 2px solid var(--bg-0); }
::-webkit-scrollbar-thumb:hover { background: var(--petrol); }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

.skip-link {
  position: fixed;
  top: 12px; left: 12px;
  z-index: 4000;
  padding: 0.7rem 1.1rem;
  background: var(--bg-2);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  transform: translateY(-300%);
  transition: transform 0.3s var(--ease-out);
}
.skip-link:focus-visible { transform: translateY(0); }

.container {
  width: min(var(--container), 100% - var(--gutter) * 2);
  margin-inline: auto;
}

/* ============================================================
   TRANSFORMATION SCROLL — every section is a centered scene
   that dissolves into the next (no stacked-page feeling)
   ============================================================ */
.site-bg { position: fixed; inset: 0; z-index: 0; pointer-events: none; }
#site-dust { position: absolute; inset: 0; width: 100%; height: 100%; }
main { position: relative; z-index: 1; }

.scene { position: relative; height: 185vh; }
.hero.scene { height: 165vh; }
.soon.scene { height: 150vh; }

/* Scenes overlap by one viewport: the incoming stage pins exactly
   when the outgoing one unpins — pure dissolve, no dead travel */
.scene + .scene,
.scene + .experience,
.experience + .scene { margin-top: -100vh; }
html.no-js .scene + .scene, html.reduced .scene + .scene,
html.no-js .scene + .experience, html.reduced .scene + .experience,
html.no-js .experience + .scene, html.reduced .experience + .scene { margin-top: 0; }

.scene-stage {
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100svh;
  display: grid;
  place-items: center;
  overflow: hidden;
  overflow: clip;
  will-change: opacity, transform, filter;
}

/* Static fallback: no JS / reduced motion → a normal, readable page */
html.no-js .scene, html.reduced .scene { height: auto; }
html.no-js .scene-stage, html.reduced .scene-stage {
  position: static;
  height: auto;
  min-height: 100svh;
  padding-block: 3rem;
}

/* ---------- Shared type ---------- */
.eyebrow {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--cyan);
}

.sec-line {
  display: inline-block;
  width: 44px; height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
  flex: none;
}

.grad-text {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.line { display: block; overflow: hidden; }
.line-inner { display: inline-block; will-change: transform; }

/* ============================================================
   PRELOADER
   ============================================================ */
.loader {
  position: fixed;
  inset: 0;
  z-index: 3000;
  display: grid;
  place-items: center;
  background:
    radial-gradient(900px 520px at 70% 20%, rgba(0, 144, 173, 0.14), transparent 65%),
    var(--bg-0);
  transition: transform 0.9s var(--ease-io), visibility 0s linear 0.9s;
}
.loader.done { transform: translateY(-100%); visibility: hidden; }

.loader-inner { display: grid; justify-items: center; gap: 1.6rem; padding: 1rem; }

.loader-symbol {
  width: clamp(64px, 9vw, 92px);
  filter: drop-shadow(0 0 24px rgba(0, 208, 212, 0.35));
}
.loader-symbol .lp {
  opacity: 0;
  transform: translateY(10px);
  animation: lp-in 0.65s var(--ease-out) forwards;
  animation-delay: calc(var(--i) * 95ms + 120ms);
}
@keyframes lp-in {
  to { opacity: 1; transform: translateY(0); }
}

.loader-word { opacity: 0; animation: fade-in 0.8s ease forwards 1s; }
.loader-word img { width: 118px; height: auto; opacity: 0.92; }

.loader-progress {
  width: min(220px, 56vw);
  height: 1px;
  background: rgba(255, 255, 255, 0.12);
  overflow: hidden;
  border-radius: 2px;
}
.loader-bar {
  display: block;
  height: 100%;
  width: 100%;
  background: var(--grad-brand);
  transform: translateX(-100%);
  animation: load-bar 1.6s var(--ease-io) forwards 0.25s;
}
@keyframes load-bar { to { transform: translateX(0); } }

.loader-status {
  font-size: 0.64rem;
  font-weight: 500;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--text-low);
  opacity: 0;
  animation: fade-in 0.8s ease forwards 0.55s;
}
.loader-dots::after {
  content: "";
  animation: dots 1.2s steps(4) infinite;
}
@keyframes dots { 0% { content: ""; } 25% { content: "."; } 50% { content: ".."; } 75% { content: "..."; } }
@keyframes fade-in { to { opacity: 1; } }

/* Returning visitors: swift entrance */
html.revisit .loader-symbol .lp { animation-duration: 0.3s; animation-delay: calc(var(--i) * 24ms); }
html.revisit .loader-bar { animation-duration: 0.5s; animation-delay: 0.05s; }
html.revisit .loader-word { animation-delay: 0.2s; }

/* No-JS: the loader dissolves by itself and the page remains usable */
html.no-js .loader { animation: loader-autohide 0.6s ease forwards 2.6s; }
@keyframes loader-autohide { to { opacity: 0; visibility: hidden; } }

/* ============================================================
   CUSTOM CURSOR
   ============================================================ */
.cursor { display: none; }
@media (hover: hover) and (pointer: fine) {
  .cursor { display: block; pointer-events: none; position: fixed; inset: 0; z-index: 3500; }
  .cursor-dot, .cursor-ring {
    position: fixed;
    top: 0; left: 0;
    border-radius: 50%;
    translate: -50% -50%;
    will-change: transform;
  }
  .cursor-dot {
    width: 6px; height: 6px;
    background: var(--cyan);
    box-shadow: 0 0 12px rgba(0, 208, 212, 0.8);
  }
  .cursor-ring {
    width: 34px; height: 34px;
    border: 1px solid rgba(0, 208, 212, 0.45);
    transition: width 0.28s var(--ease-out), height 0.28s var(--ease-out),
                border-color 0.28s ease, background-color 0.28s ease;
  }
  .cursor.is-hover .cursor-ring {
    width: 56px; height: 56px;
    border-color: rgba(0, 208, 212, 0.9);
    background: rgba(0, 208, 212, 0.07);
  }
  .cursor.is-down .cursor-ring { width: 26px; height: 26px; }
  body.has-cursor, body.has-cursor a, body.has-cursor button { cursor: none; }
}

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  transition: transform 0.5s var(--ease-out), background-color 0.4s ease,
              backdrop-filter 0.4s ease, border-color 0.4s ease;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(3, 15, 20, 0.55);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  backdrop-filter: blur(16px) saturate(150%);
  border-color: var(--line);
}
.nav.hidden { transform: translateY(-100%); }

.nav-inner {
  width: min(1520px, 100% - var(--gutter) * 2);
  margin-inline: auto;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.nav-brand { display: flex; align-items: center; gap: 0.8rem; }
.nav-symbol { width: 26px; height: auto; }
.nav-word { width: 104px; height: auto; opacity: 0.95; }

.nav-right { display: flex; align-items: center; gap: 1.1rem; }

.nav-contact {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-mid);
  padding: 0.55rem 0.25rem;
  position: relative;
  transition: color 0.3s ease;
}
.nav-contact::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0.2rem;
  width: 100%; height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s var(--ease-out);
}
.nav-contact:hover { color: var(--white); }
.nav-contact:hover::after { transform: scaleX(1); transform-origin: left; }

/* Language switcher — glass pill */
.lang {
  position: relative;
  display: flex;
  padding: 4px;
  border-radius: 999px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  backdrop-filter: blur(14px) saturate(160%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
.lang-btn {
  position: relative;
  z-index: 1;
  padding: 0.42rem 0.85rem;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--text-low);
  border-radius: 999px;
  transition: color 0.3s ease;
}
.lang-btn:hover { color: var(--text-mid); }
.lang-btn[aria-pressed="true"] { color: var(--bg-0); }
.lang-ind {
  position: absolute;
  top: 4px; bottom: 4px; left: 4px;
  width: 44px;
  border-radius: 999px;
  background: var(--grad-brand);
  box-shadow: 0 2px 14px rgba(0, 208, 212, 0.35);
  transition: transform 0.45s var(--ease-out), width 0.45s var(--ease-out);
}

/* ============================================================
   HERO
   ============================================================ */
.hero { isolation: isolate; }
.hero .scene-stage {
  grid-template-rows: 1fr auto;
  place-items: stretch;
  align-items: center;
}

/* Aurora mesh — brand hues only */
.aurora {
  position: absolute;
  border-radius: 50%;
  filter: blur(110px);
  opacity: 0.55;
  will-change: transform;
}
.aurora-1 {
  width: 60vw; height: 60vw;
  max-width: 900px; max-height: 900px;
  top: -22%; right: -14%;
  background: radial-gradient(circle at 35% 35%, rgba(0, 144, 173, 0.55), transparent 65%);
  animation: drift-1 26s ease-in-out infinite alternate;
}
.aurora-2 {
  width: 46vw; height: 46vw;
  max-width: 720px; max-height: 720px;
  bottom: -26%; left: -12%;
  background: radial-gradient(circle at 60% 40%, rgba(0, 208, 212, 0.28), transparent 62%);
  animation: drift-2 32s ease-in-out infinite alternate;
}
.aurora-3 {
  width: 34vw; height: 34vw;
  max-width: 520px; max-height: 520px;
  top: 30%; left: 30%;
  background: radial-gradient(circle, rgba(0, 144, 173, 0.22), transparent 60%);
  animation: drift-3 22s ease-in-out infinite alternate;
}
@keyframes drift-1 { to { transform: translate(-8%, 10%) scale(1.12); } }
@keyframes drift-2 { to { transform: translate(10%, -8%) scale(1.08); } }
@keyframes drift-3 { to { transform: translate(-12%, -10%) scale(0.94); } }

/* Laboratory dot grid, fading upward */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.10) 1px, transparent 1.4px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 62% at 50% 88%, black 10%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse 90% 62% at 50% 88%, black 10%, transparent 72%);
  opacity: 0.5;
}

/* Particle stage: layered above the crisp signature so the
   molecular field, absorption streams and light sweep read on top */
.hero-stage { position: absolute; inset: 0; z-index: 2; pointer-events: none; }
#hero-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }

.hero-logo-space {
  position: relative;
  width: min(76vw, 520px);
  aspect-ratio: 218.54 / 179.78; /* official signature proportions */
}
.hero-logo-space::before {
  content: "";
  position: absolute;
  inset: -22%;
  background: radial-gradient(circle at 50% 46%, rgba(0, 208, 212, 0.10), rgba(0, 144, 173, 0.05) 45%, transparent 68%);
  animation: logo-breathe 7s ease-in-out infinite alternate;
  pointer-events: none;
}
@keyframes logo-breathe {
  from { opacity: 0.55; transform: scale(0.97); }
  to   { opacity: 1;    transform: scale(1.05); }
}
.hero-logo-fallback {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.6s ease;
}
html.no-js .hero-logo-fallback,
html.reduced .hero-logo-fallback,
.hero.logo-static .hero-logo-fallback { opacity: 1; }
html.no-js #hero-canvas,
html.reduced #hero-canvas { display: none; }

.hero-min .hero-content { position: relative; z-index: 1; gap: clamp(1.8rem, 4.5vh, 3rem); }
.hero-min .hero-sub { max-width: 30em; font-size: clamp(1rem, 1.5vw, 1.2rem); }
.hero-min .hero-foot { justify-content: center; }

.hero-content {
  width: min(var(--container), 100% - var(--gutter) * 2);
  margin-inline: auto;
  padding-top: calc(var(--nav-h) + 2vh);
  display: grid;
  justify-items: center;
  text-align: center;
  gap: 1.4rem;
}

.hero-sub {
  max-width: 34em;
  font-size: clamp(0.98rem, 1.4vw, 1.15rem);
  font-weight: 400;
  color: var(--text-mid);
  text-wrap: balance;
}

.hero-foot {
  width: min(1520px, 100% - var(--gutter) * 2);
  margin-inline: auto;
  padding-bottom: 2.2rem;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
}
.scroll-hint { display: flex; align-items: center; gap: 0.9rem; }
.scroll-line {
  position: relative;
  width: 1px; height: 56px;
  background: rgba(255, 255, 255, 0.14);
  overflow: hidden;
}
.scroll-line::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--cyan);
  transform: translateY(-100%);
  animation: scroll-run 2.2s var(--ease-io) infinite;
}
@keyframes scroll-run {
  0% { transform: translateY(-100%); }
  55% { transform: translateY(0); }
  100% { transform: translateY(100%); }
}
.scroll-label {
  font-size: 0.64rem;
  font-weight: 600;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--text-low);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.95rem 1.7rem;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
  transition: box-shadow 0.35s ease, border-color 0.35s ease,
              color 0.35s ease, background-color 0.35s ease;
  will-change: transform;
}
.btn svg { transition: transform 0.35s var(--ease-out); flex: none; }
.btn:hover svg { transform: translateX(4px); }
.btn-ghost:hover svg { transform: translateY(3px); }

.btn-primary {
  background: var(--grad-brand);
  color: #03252B;
  box-shadow: 0 10px 34px rgba(0, 208, 212, 0.22), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}
.btn-primary:hover {
  box-shadow: 0 14px 46px rgba(0, 208, 212, 0.38), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

.btn-ghost {
  border: 1px solid var(--line-strong);
  color: var(--text-mid);
  background: rgba(255, 255, 255, 0.02);
}
.btn-ghost:hover { border-color: rgba(0, 208, 212, 0.6); color: var(--white); }

.btn-lg { padding: 1.15rem 2rem; font-size: 0.9rem; text-transform: none; letter-spacing: 0.04em; }

/* ============================================================
   EXPERIENCE — molecular assembly
   ============================================================ */
.experience {
  position: relative;
  height: 380vh;
}
.exp-stage {
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100svh;
  overflow: clip;
}
.exp-canvas { position: absolute; inset: 0; width: 100%; height: 100%; }

.exp-vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 90% at 50% 50%, transparent 55%, rgba(3, 15, 20, 0.85) 100%),
    linear-gradient(180deg, rgba(3, 15, 20, 0.9), transparent 14% 86%, rgba(3, 15, 20, 0.9));
}

.exp-captions { position: absolute; inset: 0; pointer-events: none; }
.exp-caption {
  position: absolute;
  top: 50%; left: 50%;
  translate: -50% -50%;
  width: max-content;
  max-width: min(92vw, 1100px);
  text-align: center;
  opacity: 0;
  filter: blur(10px);
  transform: translateY(26px) scale(0.99);
  transition: opacity 0.7s ease, filter 0.7s ease, transform 0.7s var(--ease-out);
  will-change: opacity, filter, transform;
  padding-inline: var(--gutter);
}
.exp-caption.active { opacity: 1; filter: blur(0); transform: translateY(0) scale(1); }
.exp-word {
  font-size: clamp(2.6rem, 7vw, 6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  text-shadow: 0 0 60px rgba(3, 15, 20, 0.9);
}
.exp-caption[data-step="2"] .exp-word {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.exp-sub {
  margin-top: 0.9rem;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--text-mid);
}

/* ============================================================
   COMING SOON (final scene, footer embedded)
   ============================================================ */
.stage-soon {
  background: radial-gradient(1100px 700px at 50% 115%, rgba(0, 144, 173, 0.14), transparent 65%);
  padding-bottom: clamp(88px, 15vh, 128px); /* room for the embedded footer */
}
.soon-watermark {
  position: absolute;
  height: 150%;
  width: auto;
  max-width: none;
  left: -14vw;
  top: 50%;
  translate: 0 -50%;
  opacity: 0.045;
  animation: sway 18s ease-in-out infinite alternate;
  will-change: transform;
}
@keyframes sway { to { transform: translateY(-3%) rotate(3deg); } }

.soon-content { display: grid; justify-items: center; text-align: center; }

.soon-title {
  font-size: clamp(2.5rem, 6.6vw, 5.6rem);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.03em;
  text-wrap: balance;
  margin-bottom: 1.6rem;
}
.soon-sub {
  max-width: 32em;
  color: var(--text-mid);
  font-size: clamp(0.95rem, 1.3vw, 1.1rem);
  margin-bottom: 2.6rem;
  text-wrap: balance;
}
.soon-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  margin-bottom: 3.4rem;
}
#copy-email.copied { border-color: rgba(0, 208, 212, 0.7); color: var(--cyan); }

.soon-launch {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.44em;
  text-transform: uppercase;
  color: var(--text-low);
}
.soon-launch .sec-line:first-child { background: linear-gradient(-90deg, var(--cyan), transparent); }

/* ============================================================
   FOOTER — embedded at the base of the final scene
   ============================================================ */
.footer {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  border-top: 1px solid var(--line);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.6rem;
  padding-block: clamp(1.1rem, 2.6vh, 2rem);
  flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: center; gap: 0.7rem; opacity: 0.9; transition: opacity 0.3s ease; }
.footer-brand:hover { opacity: 1; }
.footer-mid { text-align: center; }
.footer-tagline { font-size: 0.8rem; color: var(--text-mid); letter-spacing: 0.08em; }
.footer-rights { font-size: 0.72rem; color: var(--text-low); margin-top: 0.3rem; letter-spacing: 0.04em; }
.to-top {
  width: 46px; height: 46px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  display: grid;
  place-items: center;
  color: var(--text-mid);
  transition: border-color 0.35s ease, color 0.35s ease, box-shadow 0.35s ease;
}
.to-top:hover {
  border-color: rgba(0, 208, 212, 0.7);
  color: var(--cyan);
  box-shadow: 0 0 24px rgba(0, 208, 212, 0.18);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (min-width: 1800px) {
  :root { --container: 1420px; }
  .hero-logo-space { width: min(60vw, 600px); }
}

@media (max-width: 640px) {
  :root { --nav-h: 68px; }
  .nav-word { display: none; }
  .nav-contact { display: none; }
  .hero-logo-space { width: 84vw; }
  .hero-sub { max-width: 28em; }
  .hero-foot { padding-bottom: 1.6rem; }
  .soon-actions { flex-direction: column; width: 100%; }
  .soon-actions .btn { width: 100%; justify-content: center; }
  .btn-lg { font-size: 0.78rem; }
  .footer-inner { justify-content: center; text-align: center; }
}

@media (max-height: 620px) and (orientation: landscape) {
  .stage-soon { padding-bottom: 72px; }
  .soon-sub { margin-bottom: 1.4rem; }
  .soon-actions { margin-bottom: 1.6rem; }
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .scene { height: auto; }
  .scene-stage { position: static; height: auto; min-height: 100svh; padding-block: 3rem; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.15s !important;
  }
  .loader { display: none; }
  .cursor { display: none !important; }
  .exp-caption { transition: opacity 0.2s ease; filter: none; transform: none; }
  .intro, [data-reveal], .line-inner { opacity: 1 !important; transform: none !important; }
}