/* ============================================================
   BITBRAINS® — DIGITAL IDENTITY  ·  v2.0
   Paper / Ink / one Truth bit.  Numbers wear units.
   ============================================================ */

:root{
  /* — core three values — */
  --paper:#FAFAF7;
  --ink:#0A0A0A;
  --truth:#E63329;

  /* — 9-stop grayscale ramp (Mist → Carbon) — */
  --mist:#F2F1ED; --fog:#E6E5E0; --ash:#D1CFC9; --stone:#B0AEA7;
  --slate:#8C8A83; --smoke:#6B6963; --iron:#494742; --coal:#2E2D29; --carbon:#1A1A1A;

  --ease:cubic-bezier(.22,1,.36,1);
  --pad:clamp(20px,5vw,72px);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  background:var(--ink);
  color:var(--paper);
  font-family:'Archivo',sans-serif;
  font-weight:400;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
.mono{font-family:'JetBrains Mono',monospace;font-weight:400}
::selection{background:var(--truth);color:var(--paper)}
a{color:inherit;text-decoration:none}

/* ── fixed WebGL stage ── */
#stage{position:fixed;inset:0;width:100vw;height:100vh;z-index:0;display:block}

/* ── grain + vignette overlays ── */
.grain{
  position:fixed;inset:-50%;width:200%;height:200%;z-index:2;pointer-events:none;
  opacity:.05;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation:grain 6s steps(6) infinite;
}
@keyframes grain{
  0%,100%{transform:translate(0,0)} 20%{transform:translate(-4%,3%)}
  40%{transform:translate(3%,-4%)} 60%{transform:translate(-2%,2%)} 80%{transform:translate(2%,-2%)}
}
.vignette{
  position:fixed;inset:0;z-index:2;pointer-events:none;
  background:radial-gradient(130% 100% at 50% 45%,transparent 45%,rgba(0,0,0,.55) 100%);
}

/* ═══════════ brand mark — canonical SVG (bb-mark.svg via <use>) ═══════════ */
.mark{width:27px;height:27px;flex:0 0 auto;display:block}
.mark.lg{width:46px;height:46px}

/* ═══════════ NAV ═══════════ */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:6;
  display:flex;align-items:center;justify-content:space-between;
  padding:18px var(--pad);
  transition:background .5s var(--ease),padding .5s var(--ease);
}
.nav.solid{background:linear-gradient(var(--ink),transparent);padding-top:14px;padding-bottom:22px}
.brand{display:flex;align-items:center;gap:10px}
.brand-word{
  font-weight:600;font-size:19px;letter-spacing:-.025em;color:var(--paper);
}
.brand-word sup{font-size:.5em;font-weight:500;top:-.9em}
.nav-links{display:flex;align-items:center;gap:26px;font-size:12.5px;letter-spacing:.02em}
.nav-links a{color:var(--paper);opacity:.6;transition:opacity .3s}
.nav-links a:hover{opacity:1}
.nav-cta{
  border:1px solid rgba(250,250,247,.35);padding:6px 13px;opacity:1!important;
  transition:background .3s,color .3s,border-color .3s;
}
.nav-cta:hover{background:var(--paper);color:var(--ink)!important;border-color:var(--paper)}

/* ═══════════ TELEMETRY HUD ═══════════ */
.hud{
  position:fixed;left:var(--pad);bottom:26px;z-index:5;
  font-size:11px;letter-spacing:.03em;color:var(--slate);
  display:flex;flex-direction:column;gap:5px;pointer-events:none;
  opacity:0;transform:translateY(8px);transition:opacity .8s,transform .8s;
}
.hud.show{opacity:1;transform:none}
.hud-row{display:flex;gap:14px;justify-content:space-between;min-width:180px}
.hud-row span:first-child{color:var(--smoke)}
.hud-row span:last-child{color:var(--stone)}

/* ═══════════ SCROLL RAIL ═══════════ */
.rail{position:fixed;right:0;top:0;bottom:0;width:2px;z-index:5;background:rgba(255,255,255,.05)}
.rail-fill{position:absolute;top:0;left:0;width:100%;height:0;background:var(--truth)}

/* ═══════════ ACTS / LAYOUT ═══════════ */
.act{
  position:relative;z-index:1;
  min-height:100vh;display:flex;align-items:center;
  padding:120px var(--pad);
}
.act--right{justify-content:flex-end;text-align:right}
.act--left{justify-content:flex-start}
.act--center,.act--thesis,.act--hero{justify-content:center;text-align:center}
.act-inner{max-width:640px;width:100%}
.act--hero .act-inner{max-width:1100px}
.act--center .act-inner{max-width:860px}

/* reveal system */
.reveal{opacity:0;transform:translateY(26px);transition:opacity 1s var(--ease),transform 1s var(--ease)}
.reveal.in{opacity:1;transform:none}
.act-inner .reveal:nth-child(2){transition-delay:.08s}
.act-inner .reveal:nth-child(3){transition-delay:.16s}
.act-inner .reveal:nth-child(4){transition-delay:.24s}

/* ── type styles ── */
.eyebrow{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--slate);margin-bottom:38px}
.label{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--truth);margin-bottom:22px}
.act--right .label{color:var(--truth)}

.display{
  font-weight:900;font-stretch:66%;line-height:.84;letter-spacing:-.02em;text-transform:uppercase;
  font-size:clamp(60px,14vw,190px);
}
.display .line{display:block}
.dot{color:var(--truth)}
/* hero full-stop rendered as a real square = the point of singularity */
.dot--sq{display:inline-block;width:.26em;height:.26em;background:var(--truth);
  vertical-align:baseline;margin-left:.05em;transition:opacity .25s var(--ease)}

/* the singularity seed — fixed square that falls to screen center, then detonates */
#bangSeed{
  position:fixed;top:0;left:0;width:30px;height:30px;background:var(--truth);
  opacity:0;pointer-events:none;z-index:4;transform:translate(-200px,-200px);
  will-change:transform,opacity;
}

.head{
  font-weight:900;font-stretch:66%;line-height:.88;letter-spacing:-.015em;text-transform:uppercase;
  font-size:clamp(46px,8vw,112px);margin-bottom:26px;
}
.head--big{font-size:clamp(50px,9.2vw,140px)}
.sub{font-weight:800;font-size:clamp(28px,3.4vw,44px);letter-spacing:-.02em;margin-bottom:20px}

.lede{
  font-size:clamp(16px,1.5vw,20px);line-height:1.55;color:var(--stone);
  max-width:620px;margin:34px auto 0;font-weight:400;
}
.body{font-size:clamp(15px,1.35vw,18px);line-height:1.6;color:var(--stone);max-width:520px;font-weight:400;text-shadow:0 2px 30px rgba(10,10,10,.92),0 1px 4px rgba(10,10,10,.85)}
.sub,.head,.lede,.thesis,.foot-motto,.display{text-shadow:0 4px 40px rgba(10,10,10,.7)}
.act--right .body{margin-left:auto}
.body--wide{max-width:640px;margin-left:auto;margin-right:auto}
.body em{color:var(--paper);font-style:italic}
.tele{margin-top:28px;font-size:12.5px;letter-spacing:.04em;color:var(--smoke)}
.act--center .tele{color:var(--slate)}

/* scroll cue */
.scroll-cue{margin-top:52px;display:inline-flex;align-items:center;gap:12px;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--smoke)}
.scroll-cue i{width:1px;height:34px;background:linear-gradient(var(--smoke),transparent);position:relative;overflow:hidden}
.scroll-cue i::after{content:"";position:absolute;top:0;left:0;width:100%;height:12px;background:var(--truth);animation:cue 2s var(--ease) infinite}
@keyframes cue{0%{transform:translateY(-14px)}100%{transform:translateY(40px)}}

/* ── thesis ── */
.act--thesis{background:transparent}
.thesis{font-weight:900;font-stretch:66%;line-height:.9;letter-spacing:-.015em;text-transform:uppercase;font-size:clamp(46px,8.6vw,128px)}
.t-line{display:block}
.t-strong{color:var(--paper)}
.t-mute{color:var(--iron)}
.act--thesis cite{display:block;margin-top:40px;font-style:normal;font-size:13px;letter-spacing:.05em;color:var(--slate)}

/* ── studio ── */
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:clamp(30px,6vw,90px);max-width:1000px;text-align:left}
.act--studio{text-align:left;justify-content:center}
.act--studio .act-inner{max-width:1000px}
.principles{list-style:none;display:flex;flex-wrap:wrap;gap:10px;margin-top:64px}
.principles li{border:1px solid var(--iron);padding:7px 14px;font-size:11px;letter-spacing:.05em;color:var(--slate)}

/* ── footer ── */
.act--foot{min-height:100vh;align-items:flex-end;justify-content:center;padding-bottom:40px;background:linear-gradient(transparent,rgba(0,0,0,.6))}
.act--foot .act-inner{max-width:1200px}
.foot-motto{font-size:clamp(40px,9vw,132px);margin-bottom:70px}
.foot-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:40px;align-items:stretch;padding-bottom:48px;border-bottom:1px solid var(--iron)}
/* labels share the top line, metas share the bottom line, brand sits on the middle axis */
.foot-grid>div:not(.foot-brand){display:flex;flex-direction:column;align-items:flex-start}
.foot-grid .foot-meta{margin-top:auto;padding-top:12px}
.foot-grid .foot-brand{align-self:center}
.foot-link{font-size:clamp(18px,2vw,26px);font-weight:600;letter-spacing:-.02em;border-bottom:1px solid var(--iron);padding-bottom:3px;transition:border-color .3s}
.foot-link:hover{border-color:var(--truth)}
.foot-meta{font-size:12px;color:var(--smoke);margin-top:12px}
.dispatch-btn{display:inline-block;background:var(--paper);color:var(--ink);font-weight:700;font-size:14px;letter-spacing:.02em;padding:13px 22px;transition:transform .3s var(--ease),background .3s}
.dispatch-btn:hover{transform:translateX(4px)}
.foot-brand{display:flex;align-items:center;gap:12px;justify-content:flex-end}
.foot-brand .brand-word{font-size:24px}
.foot-legal{margin-top:26px;font-size:11px;color:var(--smoke);letter-spacing:.04em}

/* ═══════════ RESPONSIVE ═══════════ */
@media(max-width:820px){
  .nav-links{gap:16px;font-size:11px}
  .hud{display:none}
  .act{padding:110px var(--pad);min-height:100vh}
  .act--right,.act--left{text-align:left;justify-content:flex-start}
  .act--right .body,.act--right .label{margin-left:0}
  .grid-2{grid-template-columns:1fr;gap:44px}
  .foot-grid{grid-template-columns:1fr;gap:32px}
  .foot-brand{justify-content:flex-start}
}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .scroll-cue i::after,.grain{animation:none}
}

/* ═══════════ PRELOADER ═══════════ */
#preloader{
  position:fixed;inset:0;z-index:50;background:var(--ink);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:34px;
  transition:opacity .8s var(--ease),visibility .8s;
}
#preloader.done{opacity:0;visibility:hidden}
.pre-mark{
  width:14px;height:14px;background:var(--truth);
  box-shadow:0 0 0 0 rgba(230,51,41,.6);
  animation:prepulse 1.4s var(--ease) infinite;
}
@keyframes prepulse{
  0%{box-shadow:0 0 0 0 rgba(230,51,41,.5);transform:scale(1)}
  70%{box-shadow:0 0 0 26px rgba(230,51,41,0);transform:scale(1.15)}
  100%{box-shadow:0 0 0 0 rgba(230,51,41,0);transform:scale(1)}
}
.pre-line{display:flex;gap:20px;font-size:11px;letter-spacing:.1em;color:var(--smoke);text-transform:uppercase}
.pre-line #prePct{color:var(--stone)}