/* Structural CSS for engine.js modules. The style world (tokens + type + skin) lives in styles.css.
   Every colour/size here reads a token so a new world only rewrites :root in styles.css. */
*{box-sizing:border-box;margin:0;padding:0}
html{background:var(--bg-deep);-webkit-text-size-adjust:100%}
html.lenis,html.lenis body{height:auto}
.lenis.lenis-smooth{scroll-behavior:auto!important}
body{font-family:var(--f-body);color:var(--on-deep);background:var(--bg-deep);-webkit-font-smoothing:antialiased}
img,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}

/* nav */
.nav{position:fixed;inset:0 0 auto 0;z-index:50;height:var(--nav-h,68px);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 var(--gutter);transition:background .5s,border-color .5s;border-bottom:1px solid transparent}
.nav.solid{background:var(--nav-solid);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-color:var(--line-deep)}
.nav .links{display:flex;gap:clamp(18px,2.2vw,32px)}
.nav:not(.solid) .links{opacity:0;pointer-events:none}
.nav .links,.nav.solid .links{transition:opacity .4s}
.nav .cta{justify-self:end}

/* scrub */
.scrub{position:relative;height:calc(var(--len,900) * 1vh)}
.scrub .stage{position:sticky;top:0;height:100vh;height:100svh;overflow:hidden;background:var(--bg-deep)}
.scrub canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.scrub .shade{position:absolute;inset:0;pointer-events:none;background:var(--scrub-shade)}
.scrub [data-from]{opacity:0;translate:0 var(--lift,0);will-change:opacity,translate}
.scrub .loader{position:absolute;right:20px;top:calc(var(--nav-h,68px) + 16px);font-size:12px;opacity:.6;transition:opacity .6s}
.scrub.loaded .loader{opacity:0}
.rail{position:absolute;right:var(--gutter);bottom:clamp(28px,5vh,48px);list-style:none;display:flex;gap:18px;font-size:12px;font-weight:500}
.rail li{opacity:.45;position:relative;padding-top:12px;transition:opacity .4s}
.rail li::before{content:"";position:absolute;top:0;left:0;height:2px;width:100%;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .5s}
.rail li.on{opacity:1}.rail li.on::before{transform:scaleX(1)}

/* stack */
.stack-card{position:sticky;top:0;height:100vh;height:100svh;overflow:hidden;background:var(--bg-deep)}
.stack-media{position:absolute;inset:0}
.stack-media img,.stack-media video{width:100%;height:100%;object-fit:cover}
.stack-card::after{content:"";position:absolute;inset:0;pointer-events:none;background:var(--card-shade)}
.stack-copy,.stack-side{position:absolute;z-index:2}

/* hpin */
.hpin{position:relative;height:100vh;height:100svh;overflow:hidden;display:flex;flex-direction:column;justify-content:center}
.hpin-track{display:flex;padding:0 var(--gutter);will-change:transform}

/* split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:var(--gutter);padding:0 var(--gutter)}
.split-media{position:sticky;top:0;height:100vh;height:100svh;display:grid;place-items:center}
.split-media > *{grid-area:1/1;opacity:0;transform:scale(1.04);transition:opacity .7s,transform .9s}
.split-media > .on{opacity:1;transform:none}
.split-steps{padding:30vh 0}
.split-step{min-height:70vh;display:flex;flex-direction:column;justify-content:center;opacity:.35;transition:opacity .5s}
.split-step.on{opacity:1}

/* portal */
.portal{position:relative;height:300vh}
.portal-stage{position:sticky;top:0;height:100vh;height:100svh;overflow:hidden}
.portal-frame{position:absolute;inset:0;overflow:hidden}
.portal-frame img,.portal-frame video{width:100%;height:100%;object-fit:cover}
.portal-before,.portal-after{position:absolute;z-index:2}

/* misc */
.words .w{display:inline}
.mask-reveal{overflow:hidden}

@media (max-width:900px){
  .nav .links{display:none}
  .nav{grid-template-columns:1fr auto}
  .rail{left:16px;right:16px;justify-content:space-between;gap:6px;font-size:11px}
  .split{grid-template-columns:1fr}
  .split-media{position:relative;height:60vh}
  .split-steps{padding:6vh 0}
  .split-step{min-height:auto;padding:6vh 0;opacity:1}
}
@media (prefers-reduced-motion:reduce){
  .split-media > *{transition:none}
}