/* GLASS premium tier — fixed adaptive header, film stage, beats, depth gauge. */

/* ---------- fixed header over the film ---------- */
.site-head{
  position:fixed;inset:0 0 auto 0;z-index:40;
  color:var(--text-light);
  transition:color .35s var(--ease-out);
}
.site-head.on-light{color:var(--text-dark)}
.site-head::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(to bottom,rgba(6,14,23,.55),transparent);
  opacity:1;transition:opacity .35s;
}
.site-head.on-light::before{opacity:0}
.head-inner{
  max-width:1400px;margin-inline:auto;padding:1.1rem var(--gutter);
  display:flex;align-items:center;gap:2rem;position:relative;
}
.head-nav{display:flex;gap:1.8rem;margin-left:auto}
.head-nav a{
  font-size:.82rem;letter-spacing:.12em;text-transform:uppercase;font-weight:600;
  opacity:.85;transition:opacity var(--dur-fast);
}
.head-nav a:hover,.head-nav a:focus-visible{opacity:1}
.head-cta{border:1px solid currentColor;border-radius:999px;padding:.55em 1.2em;
  font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;font-weight:600;
  transition:background var(--dur-fast),color var(--dur-fast)}
.head-cta:hover{background:var(--amber);border-color:var(--amber);color:var(--ink)}

/* depth gauge readout */
.gauge{
  display:flex;align-items:center;gap:.8rem;margin-left:auto;
  font-variant-numeric:tabular-nums;
}
.head-nav{margin-left:0}
.gauge .g-label{font-size:.62rem;letter-spacing:.28em;text-transform:uppercase;opacity:.7}
.gauge .g-depth{font-size:.95rem;font-weight:600;min-width:4.2ch;text-align:right}
.gauge .g-bar{position:relative;width:74px;height:2px;background:currentColor;opacity:.9}
.gauge .g-bar::before{content:"";position:absolute;inset:0;opacity:.25;background:currentColor}
.gauge .g-fill{position:absolute;inset:0 auto 0 0;width:0%;background:var(--caustic)}
.site-head.on-light .g-fill{background:var(--teal)}
.gauge .g-ch{font-size:.62rem;letter-spacing:.2em;text-transform:uppercase;opacity:.75;
  min-width:11ch}
@media (max-width:980px){.head-nav{display:none}.gauge .g-ch{display:none}}
@media (max-width:640px){.gauge .g-bar{display:none}.head-inner{gap:1rem}}

/* ---------- the film ---------- */
.film-driver{position:relative;height:850vh;background:var(--ink)}
.film-stage{position:sticky;top:0;height:100vh;height:100svh;overflow:hidden}
.film-stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block}

/* poster fallback (pre-frames / static mode) */
.film-poster{position:absolute;inset:0;background:center/cover no-repeat}

/* grain + vignette sell the single shot; JS fades via --filmfade */
.film-vignette{position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(120% 90% at 50% 42%,transparent 55%,rgba(4,9,15,.55) 100%);
  opacity:var(--filmfade,1)}
.film-grain{position:absolute;inset:-60px;pointer-events:none;opacity:calc(var(--filmfade,1)*.3);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  animation:grain 7s steps(9) infinite}
@keyframes grain{
  0%,100%{transform:translate(0,0)}20%{transform:translate(-18px,12px)}
  40%{transform:translate(14px,-20px)}60%{transform:translate(-10px,-14px)}80%{transform:translate(16px,18px)}
}
.film-seamfade{position:absolute;inset:auto 0 0 0;height:34vh;pointer-events:none;opacity:0;
  background:linear-gradient(to bottom,transparent,var(--seam,#0a1622))}

/* ambient steam over the opening */
.film-ambient{position:absolute;inset:0;pointer-events:none}

/* ---------- beats ---------- */
.beat{
  position:absolute;inset:0;display:grid;place-items:center;text-align:center;
  padding:0 var(--gutter);opacity:0;pointer-events:none;color:var(--text-light);
}
.beat-inner{max-width:52rem}
.beat .kicker{color:var(--caustic);text-shadow:0 1px 24px rgba(6,14,23,.6)}
.beat h2,.beat h1{
  font-family:var(--font-display);font-weight:400;line-height:1.12;
  font-size:clamp(1.9rem,1.2rem + 3.4vw,4.2rem);
  margin-top:1rem;text-wrap:balance;
  text-shadow:0 2px 40px rgba(6,14,23,.75);
}
.beat p{margin-top:1.1rem;color:rgba(233,238,242,.82);font-size:1.05rem;
  text-shadow:0 1px 18px rgba(6,14,23,.8)}
.beat .beat-ctas{margin-top:2rem;display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;
  pointer-events:none}
.beat.live .beat-ctas{pointer-events:auto}
.beat.live{pointer-events:auto}

/* the hero beat is bigger; the finale anchors left so the pool stays hero */
.beat[data-id="hero"] h1{font-size:var(--text-hero);letter-spacing:.02em}
.beat[data-id="hero"] .scroll-cue{
  margin-top:3rem;display:inline-flex;flex-direction:column;align-items:center;gap:.6rem;
  font-size:.68rem;letter-spacing:.32em;text-transform:uppercase;color:rgba(233,238,242,.7);
}
.beat[data-id="hero"] .scroll-cue::after{
  content:"";width:1px;height:44px;
  background:linear-gradient(to bottom,var(--caustic),transparent);
  animation:cue 2.2s var(--ease-out) infinite;
}
@keyframes cue{0%{transform:scaleY(0);transform-origin:top}45%{transform:scaleY(1);transform-origin:top}
  55%{transform:scaleY(1);transform-origin:bottom}100%{transform:scaleY(0);transform-origin:bottom}}
.beat[data-id="finale"]{place-items:center start;text-align:left}
.beat[data-id="finale"] .beat-inner{max-width:34rem;margin-left:clamp(0rem,6vw,6rem)}
.beat[data-id="finale"] .beat-ctas{justify-content:flex-start}

/* ---------- loader ---------- */
.film-loader{
  position:fixed;inset:0;z-index:60;display:grid;place-items:center;
  background:var(--ink);color:var(--text-light);pointer-events:none;
  transition:opacity .7s var(--ease-out),visibility .7s;
}
.film-loader.done{opacity:0;visibility:hidden}
.loader-inner{display:grid;justify-items:center;gap:1.3rem;text-align:center}
.loader-inner .wm-big{font-family:var(--font-display);font-size:2rem;letter-spacing:.3em}
.loader-bar{width:min(320px,60vw);height:1px;background:var(--hairline-dark);position:relative;overflow:hidden}
.loader-bar i{position:absolute;inset:0 auto 0 0;width:0%;background:var(--caustic);transition:width .25s}
.loader-pct{font-size:.7rem;letter-spacing:.3em;color:var(--muted-on-dark)}

/* static mode (reduced motion or no frames): film collapses to a still hero */
body.film-static .film-driver{height:100vh;height:100svh}
body.film-static .beat{display:none}
body.film-static .beat[data-id="hero"]{display:grid;opacity:1}
body.film-static .film-grain{animation:none}

@media (prefers-reduced-motion:reduce){
  .beat[data-id="hero"] .scroll-cue::after{animation:none}
  .film-grain{animation:none}
}