/* ═══════════════════════════════════════════════════════
   TENEBRA T/01 — design tokens
   accent is sampled from the car's own interior light strip
   ═══════════════════════════════════════════════════════ */
:root{
  --void:#050505; --ink:#0b0b0c; --bone:#F4F2EF;
  --dim:rgba(244,242,239,.44); --dimmer:rgba(244,242,239,.20);
  --hair:rgba(244,242,239,.13);
  --amber:#E9A13B; --amber-dim:rgba(233,161,59,.82);
  --bar:2.4vh;
  --disp:"Helvetica Neue",Inter,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  --mono:ui-monospace,"SF Mono","Cascadia Mono",Consolas,"Roboto Mono",monospace;
  --ease:cubic-bezier(.22,.61,.24,1);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{background:var(--void);-webkit-text-size-adjust:100%}
body{
  background:var(--void); color:var(--bone); font-family:var(--disp);
  overflow-x:hidden; -webkit-font-smoothing:antialiased;
  cursor:crosshair;
}
body.locked{overflow:hidden;height:100vh}
a{color:inherit;text-decoration:none}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:.06em}
.dim{color:var(--dim)}
.tiny{font-size:.62rem;letter-spacing:.22em;text-transform:uppercase}
em{font-style:normal;color:var(--dimmer)}

/* ── display type ───────────────────────────────────── */
.display{
  font-size:clamp(2.6rem,8.4vw,8.6rem); font-weight:700; line-height:.90;
  letter-spacing:-.035em; text-transform:uppercase;
  text-shadow:0 2px 40px rgba(5,5,5,.7);
}
.display.xl{font-size:clamp(4rem,15vw,15rem);letter-spacing:-.05em}
.rv{display:block;overflow:hidden;padding-bottom:.02em}
.rv>i{display:block;font-style:normal;transform:translateY(105%);will-change:transform}
.eyebrow{
  font-size:.63rem;letter-spacing:.42em;text-transform:uppercase;
  color:var(--amber-dim);margin-bottom:1.5rem;
}
.lede{font-size:clamp(.95rem,1.15vw,1.12rem);line-height:1.66;color:rgba(244,242,239,.72);max-width:37ch;
  text-shadow:0 1px 20px rgba(5,5,5,.95)}
.hair{display:block;width:100%;height:1px;background:var(--hair);margin:1.9rem 0 1.1rem}

/* ── loader ─────────────────────────────────────────── */
#loader{position:fixed;inset:0;z-index:100;background:var(--void);
  transition:opacity 1.1s var(--ease);}
#loader.gone{opacity:0;pointer-events:none}
#loaderFilm{position:absolute;inset:0;width:100%;height:100%;display:block}
.ld-grade{position:absolute;inset:0;
  background:radial-gradient(120% 90% at 50% 45%,transparent 30%,rgba(5,5,5,.82) 100%)}
.ld-ui{position:absolute;inset:0;display:flex;flex-direction:column;
  justify-content:space-between;padding:clamp(1.4rem,3.4vw,2.8rem)}
.ld-top{display:flex;justify-content:space-between;align-items:baseline;font-size:.63rem;letter-spacing:.3em}
.marque{font-weight:700;letter-spacing:.44em;font-size:.8rem;text-transform:uppercase}
.ld-mid{display:flex;flex-direction:column;gap:1rem}
.ld-num{display:flex;align-items:flex-start;gap:.3rem;font-family:var(--mono);
  font-variant-numeric:tabular-nums;line-height:.8}
.ld-num b{font-size:clamp(3.4rem,11vw,9rem);font-weight:400;letter-spacing:-.04em}
.ld-num i{font-style:normal;font-size:.8rem;color:var(--dimmer);letter-spacing:.2em}
.ld-track{height:1px;background:var(--hair);position:relative;overflow:hidden}
.ld-track span{position:absolute;inset:0;width:100%;background:var(--amber);transform-origin:left center;transform:scaleX(0)}
.ld-cap{display:flex;justify-content:space-between;font-size:.6rem;letter-spacing:.26em;text-transform:uppercase}

/* ── cinema chrome ──────────────────────────────────── */
.cine{position:fixed;inset:0;z-index:40;pointer-events:none}
.cine .bar{position:absolute;left:0;right:0;height:var(--bar);background:var(--void)}
.cine .bar.top{top:0} .cine .bar.bot{bottom:0}
.brk{position:absolute;width:16px;height:16px;border:1px solid rgba(244,242,239,.3);opacity:.6}
.brk.tl{top:calc(var(--bar) + 14px);left:14px;border-right:0;border-bottom:0}
.brk.tr{top:calc(var(--bar) + 14px);right:14px;border-left:0;border-bottom:0}
.brk.bl{bottom:calc(var(--bar) + 14px);left:14px;border-right:0;border-top:0}
.brk.br{bottom:calc(var(--bar) + 14px);right:14px;border-left:0;border-top:0}
/* inline noise — kills gradient banding on the black frames */
.grain{position:absolute;inset:0;opacity:.032;mix-blend-mode:screen;
  background-image:url("data:image/svg+xml,%3Csvg%20xmlns%3D%27http%3A//www.w3.org/2000/svg%27%20width%3D%27140%27%20height%3D%27140%27%3E%3Cfilter%20id%3D%27n%27%3E%3CfeTurbulence%20type%3D%27fractalNoise%27%20baseFrequency%3D%27.9%27%20numOctaves%3D%273%27/%3E%3C/filter%3E%3Crect%20width%3D%27100%25%27%20height%3D%27100%25%27%20filter%3D%27url%28%23n%29%27/%3E%3C/svg%3E")}

/* ── top bar ────────────────────────────────────────── */
.topbar{position:fixed;top:var(--bar);left:0;right:0;z-index:45;
  display:flex;align-items:center;justify-content:space-between;
  padding:1.5rem clamp(1.6rem,3.4vw,2.8rem);
  opacity:0;transition:opacity 1s var(--ease) .3s}
body.ready .topbar{opacity:1}
.topbar nav{display:flex;gap:2.2rem;font-size:.63rem;letter-spacing:.26em;text-transform:uppercase}
.topbar nav a{color:var(--dim);transition:color .35s}
.topbar nav a:hover{color:var(--bone)}
.topbar-r{display:flex;align-items:center;gap:1.6rem}
.sound{background:transparent;border:0;color:var(--dim);font:inherit;cursor:pointer;
  display:flex;align-items:center;gap:.6rem;padding:0;
  font-size:.58rem;letter-spacing:.28em;text-transform:uppercase;transition:color .35s var(--ease)}
.sound:hover{color:var(--bone)}
body.sound .sound{color:var(--amber)}
.sound .bars{display:flex;align-items:flex-end;gap:2px;height:11px}
.sound .bars i{width:2px;height:3px;background:currentColor;opacity:.5}
/* the meter only moves when sound is actually on — a dancing icon over a
   silent page is a lie the visitor notices immediately */
body.sound .sound .bars i{opacity:1;animation:vu .9s ease-in-out infinite}
body.sound .sound .bars i:nth-child(2){animation-duration:.62s}
body.sound .sound .bars i:nth-child(3){animation-duration:1.15s}
body.sound .sound .bars i:nth-child(4){animation-duration:.78s}
@keyframes vu{0%,100%{height:3px}50%{height:11px}}
@media (prefers-reduced-motion:reduce){body.sound .sound .bars i{animation:none;height:7px}}
.rec{display:flex;align-items:center;gap:.5rem;font-size:.58rem;letter-spacing:.28em}
.rec i{width:5px;height:5px;border-radius:50%;background:#C8202B;animation:blip 2.2s infinite}
@keyframes blip{0%,45%{opacity:1}55%,100%{opacity:.15}}

/* ── chapter rail ───────────────────────────────────── */
.rail{position:fixed;right:clamp(1.4rem,2.6vw,2.2rem);top:50%;transform:translateY(-50%);
  z-index:45;display:flex;gap:.9rem;align-items:stretch;
  opacity:0;transition:opacity 1s var(--ease) .5s}
body.ready .rail{opacity:1}
.rail-line{position:relative;width:1px;background:var(--hair)}
.rail-line i{position:absolute;left:-1px;width:3px;background:var(--amber);top:0;height:100%;transform-origin:top center;transform:scaleY(0)}
.rail ol{list-style:none;display:flex;flex-direction:column;justify-content:space-between;gap:2.4rem}
.rail li{display:flex;flex-direction:column;gap:.3rem;font-size:.56rem;letter-spacing:.22em;
  text-transform:uppercase;color:var(--dimmer);transition:color .45s var(--ease)}
.rail li b{font-weight:400}
.rail li.on{color:var(--bone)}
.rail li span{opacity:0;transform:translateX(4px);transition:.45s var(--ease)}
.rail li.on span{opacity:.5;transform:none}

/* ── chapters ───────────────────────────────────────── */
main{position:relative;z-index:1}
.chapter{height:calc(var(--len) * 1vh);position:relative}
.stage{position:sticky;top:0;height:100vh;overflow:hidden;background:var(--void)}
.film{position:absolute;inset:0;width:100%;height:100%;display:block}
.grade{position:absolute;inset:0;pointer-events:none;
  background:
    linear-gradient(to bottom,rgba(5,5,5,.72) 0%,transparent 26%,transparent 68%,rgba(5,5,5,.86) 100%),
    radial-gradient(130% 100% at 50% 50%,transparent 42%,rgba(5,5,5,.55) 100%)}
/* dip-to-black at each chapter edge — hides the sticky seam so a
   chapter change reads as a film cut, not a scroll push */
.dip{position:absolute;inset:0;background:var(--void);pointer-events:none;opacity:0}
.copy{position:absolute;inset:0;display:block}
/* Copy has to survive landing on a bright panel of the car. The global
   .grade can't know where the type is, so each beat carries its own soft
   scrim anchored to the side it sits on. */
.beat::before{content:"";position:absolute;inset:-3.5rem -7rem -4rem -7rem;z-index:-1;pointer-events:none;
  background:radial-gradient(60% 70% at 26% 55%,rgba(5,5,5,.9) 0%,rgba(5,5,5,.66) 46%,transparent 76%)}
.beat.right::before{background:radial-gradient(60% 70% at 74% 55%,rgba(5,5,5,.9) 0%,rgba(5,5,5,.66) 46%,transparent 76%)}
.beat.center::before{background:radial-gradient(55% 60% at 50% 50%,rgba(5,5,5,.82) 0%,rgba(5,5,5,.5) 50%,transparent 78%)}
.beat{position:absolute;left:clamp(1.8rem,6vw,7rem);bottom:clamp(7rem,16vh,11rem);
  max-width:min(46rem,64vw);opacity:0;will-change:opacity,transform;
  transform:translateY(var(--ty,0px))}
.beat.right{left:auto;right:clamp(1.8rem,6vw,7rem);max-width:min(30rem,44vw)}
.beat.center{left:0;right:0;bottom:auto;top:50%;max-width:none;text-align:center;
  transform:translateY(calc(-50% + var(--ty,0px)))}
.specs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:1px;background:var(--hair);border:1px solid var(--hair);max-width:34rem}
.specs>div{background:var(--void);padding:1.15rem 1.2rem 1.05rem}
.specs dt{font-size:.55rem;letter-spacing:.28em;text-transform:uppercase;color:var(--dimmer);margin-bottom:.5rem}
.specs dd{font-size:1.5rem;letter-spacing:-.02em}
.specs dd em{font-size:.6rem;letter-spacing:.14em;color:var(--dimmer);margin-left:.25rem}

/* ── outro ──────────────────────────────────────────── */
#outro{min-height:100vh;display:flex;flex-direction:column;justify-content:center;
  padding:14vh clamp(1.8rem,6vw,7rem) 12vh;gap:2.4rem;
  background:radial-gradient(90% 70% at 50% 120%,rgba(233,161,59,.07),transparent 70%),var(--void)}
#outro .display{font-size:clamp(2.2rem,6.6vw,6.4rem)}
.cta{display:inline-flex;align-items:center;gap:1.1rem;align-self:flex-start;
  border:1px solid var(--hair);padding:1.15rem 1.9rem;font-size:.65rem;
  letter-spacing:.3em;text-transform:uppercase;transition:.5s var(--ease)}
.cta span{transition:transform .5s var(--ease)}
.cta:hover{border-color:var(--amber);color:var(--amber)}
.cta:hover span{transform:translateX(7px)}
#outro footer{display:flex;justify-content:space-between;border-top:1px solid var(--hair);
  padding-top:1.4rem;margin-top:4rem}

/* ── telemetry HUD ──────────────────────────────────── */
.hud{position:fixed;left:0;right:0;bottom:var(--bar);z-index:46;
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:clamp(1rem,3vw,2.6rem);
  padding:1rem clamp(1.6rem,3.4vw,2.8rem);
  opacity:0;transition:opacity 1s var(--ease) .6s}
body.ready .hud{opacity:1}
.hud-l,.hud-r{display:flex;gap:clamp(.9rem,2vw,1.8rem)}
.cell{display:flex;flex-direction:column;gap:.32rem;min-width:4.6rem}
.cell.wide{min-width:8rem}
.cell u{text-decoration:none;font-size:.5rem;letter-spacing:.3em;color:var(--dimmer)}
.cell b{font-weight:400;font-size:.74rem;letter-spacing:.08em;color:var(--dim);transition:color .6s}
body.live .cell b{color:var(--bone)}
body.live #mSysCell b,body.live #mRpm{color:var(--amber)}
/* scrubber */
.scrub{position:relative;height:34px;display:flex;align-items:center;cursor:ew-resize;touch-action:none}
.sc-track{position:absolute;left:0;right:0;height:1px;background:var(--hair)}
.sc-track i{position:absolute;inset:0;width:100%;background:var(--bone);opacity:.85;transform-origin:left center;transform:scaleX(0)}
.sc-ticks{position:absolute;left:0;right:0;height:9px;top:50%;margin-top:-4px}
.sc-ticks span{position:absolute;top:0;width:1px;height:9px;background:var(--dimmer)}
.sc-head{position:absolute;top:50%;width:1px;height:15px;margin-top:-7.5px;background:var(--amber);left:0}
.sc-head::after{content:"";position:absolute;left:-3px;top:-3px;width:7px;height:7px;
  border:1px solid var(--amber);transform:rotate(45deg)}
.sc-hint{position:absolute;left:50%;transform:translateX(-50%);bottom:-2px;
  font-size:.48rem;letter-spacing:.3em;text-transform:uppercase;color:var(--dimmer);
  opacity:0;transition:opacity .4s}
.scrub:hover .sc-hint{opacity:1}

.hint{position:fixed;left:50%;bottom:calc(var(--bar) + 4.6rem);transform:translateX(-50%);
  z-index:46;font-size:.56rem;letter-spacing:.34em;text-transform:uppercase;color:var(--dimmer);
  opacity:0;transition:opacity .8s var(--ease)}
body.ready .hint{opacity:1;animation:breathe 3.4s ease-in-out infinite 1.2s}
body.moved .hint{opacity:0 !important;animation:none}
@keyframes breathe{0%,100%{opacity:.35}50%{opacity:.9}}

/* ── responsive ─────────────────────────────────────── */
@media (max-width:900px){
  .rail{display:none}
  .beat.right{right:auto;left:clamp(1.8rem,6vw,7rem);max-width:min(30rem,80vw)}
  .specs{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:767px){
  :root{--bar:1.4vh}
  .chapter{height:calc(var(--len) * .62vh)}
  .topbar nav{display:none}
  .hud{grid-template-columns:1fr;gap:.7rem}
  .hud-r{display:none}
  .beat{bottom:9rem;max-width:88vw}
  .specs dd{font-size:1.2rem}
}
@media (prefers-reduced-motion:reduce){
  .rv>i{transform:none !important}
  .beat{opacity:1 !important}
  .chapter{height:100vh}
  .stage{position:relative}
}