/* ============================================================
   BMW M — The Hall
   Scroll-cinema shell. Structure follows the GRAIR teardown;
   palette and type are our own.
   ============================================================ */
*{margin:0;padding:0;box-sizing:border-box}

:root{
  --bg:#07080a;
  --fg:#f2f4f7;
  --dim:#6d737d;
  --line:rgba(255,255,255,.12);
  --m-blue:#3d7fc1;
  --m-navy:#1b3a6b;
  --m-red:#b8232f;
}

html,body{
  width:100%;height:100%;
  background:var(--bg);color:var(--fg);
  font-family:Manrope,Inter,sans-serif;
  overflow:hidden;
  -webkit-user-select:none;user-select:none;
  -webkit-font-smoothing:antialiased;
}
canvas.webgl{position:fixed;inset:0;width:100%;height:100%;display:block;outline:none;
  transition:filter .8s cubic-bezier(.4,0,.2,1)}
body.about-open .webgl{filter:blur(22px) brightness(.55)}
a{color:inherit}

/* ---------- vignette ---------- */
#css-vignette{position:fixed;inset:0;z-index:5;pointer-events:none}
.vig-corner{position:absolute;width:58%;height:78%;opacity:.75;
  transition:opacity 1.2s ease,height 1.2s ease}
.vig-tl{top:0;left:0;background:radial-gradient(circle at 0 0,rgba(0,0,0,.96) 0%,rgba(0,0,0,.5) 45%,transparent 85%)}
.vig-tr{top:0;right:0;background:radial-gradient(circle at 100% 0,rgba(0,0,0,.96) 0%,rgba(0,0,0,.5) 45%,transparent 85%)}
.vig-bl{bottom:0;left:0;background:radial-gradient(circle at 0 100%,rgba(0,0,0,.96) 0%,rgba(0,0,0,.5) 45%,transparent 85%)}
.vig-br{bottom:0;right:0;background:radial-gradient(circle at 100% 100%,rgba(0,0,0,.96) 0%,rgba(0,0,0,.5) 45%,transparent 85%)}
body.section-0-active .vig-tl,body.section-0-active .vig-tr{opacity:0!important}
body.section-0-active .vig-bl,body.section-0-active .vig-br{height:135%;opacity:.95!important}

/* ---------- loader ---------- */
#loading-screen{
  position:fixed;inset:0;z-index:2000;
  display:flex;align-items:center;justify-content:center;
  background:radial-gradient(circle,#0d1420 0%,#07080a 70%);
  transition:opacity 1.4s cubic-bezier(.4,0,.2,1);
}
#loading-screen.hidden{opacity:0;pointer-events:none}
.loader-content{display:flex;flex-direction:column;align-items:center;gap:2.4rem}
.roundel{filter:drop-shadow(0 0 26px rgba(61,127,193,.35))}
.roundel .rd-ring{stroke-dasharray:360;stroke-dashoffset:360;
  animation:drawRing 2s cubic-bezier(.65,0,.35,1) forwards}
.roundel .rd-quads{opacity:0;transform-origin:60px 60px;transform:scale(.9);
  animation:popQuads .9s cubic-bezier(.34,1.3,.64,1) .9s forwards}
.roundel .rd-text{fill:#e8e8e8;font-family:Inter,sans-serif;font-size:9px;
  font-weight:600;letter-spacing:.18em;opacity:0;animation:fadeIn .8s ease 1.5s forwards}
@keyframes drawRing{to{stroke-dashoffset:0}}
@keyframes popQuads{to{opacity:1;transform:scale(1)}}
@keyframes fadeIn{to{opacity:1}}

#enter-btn{
  font-family:Manrope,sans-serif;font-size:.78rem;font-weight:600;letter-spacing:.2rem;
  color:var(--fg);background:transparent;border:1px solid var(--line);
  padding:1.05rem 2.3rem;cursor:pointer;position:relative;overflow:hidden;
  transition:border-color .5s,color .5s,opacity .5s,background .5s;
  opacity:.3;pointer-events:none;
}
#enter-btn:not([disabled]){opacity:1;pointer-events:auto}
#enter-btn:not([disabled]):hover{border-color:var(--m-blue);background:var(--m-blue);color:#04070c}
.loader-desc{font-size:.68rem;font-weight:300;letter-spacing:.13rem;
  color:var(--dim);text-transform:uppercase}
.loader-progress-wrap{position:absolute;bottom:2.4rem;left:50%;transform:translateX(-50%);
  width:190px;height:1px;background:rgba(255,255,255,.1)}
.progress-bar{height:100%;width:0%;background:var(--m-blue);transition:width .3s ease}

/* ---------- hero grid ---------- */
#hero-ui{
  position:fixed;inset:2.6rem;z-index:1000;
  display:grid;grid-template-columns:repeat(5,1fr);grid-template-rows:repeat(5,1fr);
  gap:1.2rem;pointer-events:none;opacity:0;overflow:visible;
  transition:opacity 1.2s ease;
}
#hero-ui.ready{opacity:1}
#hero-ui>*{pointer-events:auto}

.hero-header{grid-area:1/1/auto/6;display:flex;justify-content:space-between;
  align-items:center;z-index:250;opacity:0;transform:translateY(-1.2rem);
  transition:opacity 1s ease,transform 1s ease}
#hero-ui.ready .hero-header{opacity:1;transform:translateY(0)}
.header-item{font-size:.72rem;font-weight:500;letter-spacing:.12rem;
  text-transform:uppercase;color:var(--fg)}
.about-btn{cursor:pointer;transition:opacity .3s}
.about-btn:hover{opacity:.6}
.logo-wrap{display:flex;align-items:center;gap:.6rem}
.wordmark{font-family:"Bebas Neue",sans-serif;font-size:1.5rem;letter-spacing:.1em;
  background:linear-gradient(90deg,var(--m-blue) 0%,#f2f2f2 45%,var(--m-red) 100%);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.audio-toggle{background:none;border:none;cursor:pointer;padding:0;width:44px;height:20px}
#audio-wave{width:44px;height:20px;display:block}

.hero-main{grid-area:1/1/3/6;display:flex;align-items:center;justify-content:center;
  pointer-events:none;overflow:visible;padding-top:2.2rem}
.hero-title{
  font-family:"Bebas Neue",sans-serif;font-size:clamp(3rem,9vw,8rem);
  font-weight:400;line-height:.86;letter-spacing:.02em;
  text-align:center;text-transform:uppercase;color:var(--fg);
  opacity:0;pointer-events:none;z-index:25;white-space:nowrap;
  transition:opacity 1.2s ease;
}
.hero-title.active{opacity:1}
.hero-title span{
  display:inline-block;white-space:pre;
  filter:blur(12px);opacity:0;transform:translateY(15px);
  background:linear-gradient(180deg,#ffffff 22%,#8b95a3 100%);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
  will-change:filter,opacity,transform;
}
.title-container{position:relative;filter:drop-shadow(0 4px 18px rgba(0,0,0,.75))}
/* a soft scrim under the hero type — the car sits directly behind it and can
   be any colour the configurator picks, white included */
.title-container::before{
  content:"";position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:150%;height:190%;pointer-events:none;z-index:-1;
  background:radial-gradient(ellipse at center,rgba(4,6,9,.72) 0%,rgba(4,6,9,.42) 45%,transparent 72%);
}

/* ---------- chamber overlays ---------- */
.section-content{
  position:absolute;top:0;left:0;width:100%;height:100%;
  display:grid;grid-template-columns:repeat(5,1fr);grid-template-rows:repeat(5,1fr);
  gap:1.2rem;pointer-events:none;z-index:50;
  opacity:0;visibility:hidden;transition:opacity .8s ease,visibility .8s;
}
.section-content.active{opacity:1;visibility:visible}
.content-wrap{grid-area:3/1/5/4;display:flex;flex-direction:column;justify-content:center;gap:1.1rem}
.section-eyebrow{font-size:.66rem;font-weight:500;letter-spacing:.24em;
  text-transform:uppercase;color:var(--m-blue);margin:0}
.section-title{
  font-family:"Bebas Neue",sans-serif;font-size:clamp(2.6rem,5.5vw,4.6rem);
  font-weight:400;line-height:.92;letter-spacing:.015em;
  color:var(--fg);text-transform:uppercase;margin:0;
}
.section-title span{
  display:inline-block;white-space:pre;
  filter:blur(12px);opacity:0;transform:translateY(15px);
  background:linear-gradient(180deg,#ffffff 30%,#7d8896 100%);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
  will-change:filter,opacity,transform;
}
.section-desc{font-size:.84rem;font-weight:300;line-height:1.7;
  color:var(--dim);width:25rem;max-width:80vw;margin:0}
.spec-row{display:flex;gap:2.4rem;margin-top:.6rem}
.spec{display:flex;flex-direction:column;gap:.2rem}
.spec b{font-family:"Bebas Neue",sans-serif;font-size:1.75rem;font-weight:400;
  letter-spacing:.02em;color:var(--fg);line-height:1}
.spec span{font-size:.62rem;letter-spacing:.16em;text-transform:uppercase;color:var(--dim)}

/* ---------- configurator ---------- */
#configurator{
  position:fixed;right:2.6rem;top:50%;transform:translateY(-50%) translateX(1.5rem);
  z-index:300;width:16.5rem;padding:1.4rem;
  background:rgba(10,12,16,.78);border:1px solid var(--line);
  backdrop-filter:blur(16px);
  opacity:0;pointer-events:none;
  transition:opacity .7s ease,transform .7s cubic-bezier(.4,0,.2,1);
}
#configurator.show{opacity:1;pointer-events:auto;transform:translateY(-50%) translateX(0)}
.cfg-head{display:flex;flex-direction:column;gap:.25rem;margin-bottom:1.3rem;
  padding-bottom:1rem;border-bottom:1px solid var(--line)}
.cfg-title{font-size:.6rem;letter-spacing:.24em;text-transform:uppercase;color:var(--dim)}
.cfg-model{font-family:"Bebas Neue",sans-serif;font-size:1.35rem;letter-spacing:.03em}
.cfg-group{margin-bottom:1.3rem}
.cfg-label{display:block;font-size:.6rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--dim);margin-bottom:.7rem}
.swatches{display:flex;flex-wrap:wrap;gap:.5rem}
.swatch{width:1.85rem;height:1.85rem;border-radius:50%;cursor:pointer;
  border:1px solid rgba(255,255,255,.22);position:relative;
  transition:transform .25s,border-color .25s}
.swatch:hover{transform:scale(1.12)}
.swatch.on{border-color:var(--fg);box-shadow:0 0 0 3px rgba(61,127,193,.35)}
.cfg-value{display:block;margin-top:.65rem;font-size:.72rem;color:var(--fg)}
.chips{display:flex;flex-direction:column;gap:.4rem}
.chip{font:inherit;font-size:.72rem;text-align:left;color:var(--fg);cursor:pointer;
  background:rgba(255,255,255,.04);border:1px solid var(--line);
  padding:.6rem .8rem;transition:background .25s,border-color .25s}
.chip:hover{background:rgba(255,255,255,.09)}
.chip.on{border-color:var(--m-blue);background:rgba(61,127,193,.16)}
.cfg-hint{font-size:.6rem;letter-spacing:.1em;color:var(--dim);
  padding-top:1rem;border-top:1px solid var(--line);margin:0}

/* ---------- about ---------- */
#about-overlay{
  position:fixed;inset:0;z-index:1500;display:flex;align-items:center;justify-content:center;
  opacity:0;pointer-events:none;transition:opacity .9s cubic-bezier(.4,0,.2,1);
  background:rgba(7,8,10,.4);
}
body.about-open #about-overlay{opacity:1;pointer-events:auto}
.about-content-center{display:flex;flex-direction:column;align-items:center;gap:2.6rem}
.panther-path{stroke-dasharray:400;stroke-dashoffset:400}
.about-text{font-size:.72rem;font-weight:300;line-height:1.9;letter-spacing:.04em;
  color:#8b929c;text-align:center;text-transform:uppercase;width:44rem;max-width:88vw;
  opacity:0;transform:translateY(1.2rem);
  transition:opacity 1s ease .5s,transform 1s ease .5s}
body.about-open .about-text{opacity:1;transform:translateY(0)}

/* ---------- scroll rail ---------- */
.hero-scroll-indicator{position:fixed;left:1.6rem;top:50%;transform:translateY(-50%);
  z-index:200;pointer-events:none}
.scroll-track-container{position:relative;width:30px;height:452px}
.scroll-path-svg{width:30px;height:452px;display:block;overflow:visible}
.scroll-follower{position:absolute;top:0;left:0;width:8px;height:8px;
  margin:-4px 0 0 -4px;border-radius:50%;background:var(--m-blue);
  box-shadow:0 0 12px rgba(61,127,193,.9)}

/* ---------- footer ---------- */
.hero-footer{grid-area:5/1/auto/6;display:flex;justify-content:space-between;
  align-items:flex-end;position:relative;z-index:250;
  opacity:0;transform:translateY(1.2rem);
  transition:opacity 1s ease .2s,transform 1s ease .2s}
#hero-ui.ready .hero-footer{opacity:1;transform:translateY(0)}
.hero-stack{display:flex;flex-direction:column;gap:1.4rem;align-items:flex-start}
/* the hero blurb belongs to the hero alone - inside a chamber it collided
   with the spec row sitting directly above it */
.footer-left{transition:opacity .6s ease}
body:not(.section-0-active) .footer-left{opacity:0;pointer-events:none}
.hero-desc{font-size:.78rem;font-weight:300;line-height:1.8;color:var(--fg);max-width:23rem}
.hero-desc .secondary{color:var(--dim)}
.cta-btn{position:relative;overflow:hidden;cursor:pointer;
  width:15rem;padding:1.1rem 1.4rem;display:flex;align-items:center;justify-content:center;
  font-family:Manrope,sans-serif;font-size:.74rem;font-weight:600;letter-spacing:.14rem;
  color:var(--fg);background:transparent;border:1px solid var(--line);
  opacity:0;pointer-events:none;transition:border-color .4s,opacity .6s}
.cta-btn.show{opacity:1;pointer-events:auto}
.btn-fill{position:absolute;inset:0;background:var(--m-blue);transform:translateY(101%);
  transition:transform .55s cubic-bezier(.65,0,.35,1)}
.btn-content{position:relative;z-index:2;transition:color .45s;display:flex;gap:.5rem;align-items:center}
.cta-btn:hover .btn-fill{transform:translateY(0)}
.cta-btn:hover .btn-content{color:#04070c}
.cta-btn:hover{border-color:var(--m-blue)}
.footer-center{display:flex;justify-content:center;flex:1;transition:opacity .6s}
.scroll-more{display:flex;flex-direction:column;align-items:center;gap:.6rem;
  font-size:.6rem;letter-spacing:.2em;color:var(--dim);text-transform:uppercase}
.mouse-icon{width:20px;height:32px;border:1px solid rgba(255,255,255,.22);
  border-radius:10px;display:flex;justify-content:center;padding-top:5px}
.mouse-wheel{width:2px;height:6px;background:var(--fg);border-radius:1px;
  animation:scroll-anim 1.8s ease-in-out infinite}
@keyframes scroll-anim{0%{opacity:0;transform:translateY(0)}35%{opacity:1}
  70%{opacity:0;transform:translateY(9px)}100%{opacity:0}}
.footer-right{width:15rem}

/* ---------- cursor ---------- */
#cursor-canvas{position:fixed;inset:0;z-index:3000;pointer-events:none}
#cursor-dot{position:absolute;top:0;left:0;width:24px;height:24px;
  border:1px solid rgba(255,255,255,.42);border-radius:50%;margin:-12px 0 0 -12px;
  transition:width .3s,height .3s,margin .3s,background .3s;mix-blend-mode:difference}
#cursor-dot.hot{width:44px;height:44px;margin:-22px 0 0 -22px;background:rgba(255,255,255,.14)}
body.dragging #cursor-dot{width:44px;height:44px;margin:-22px 0 0 -22px;
  background:rgba(61,127,193,.3)}

/* ---------- responsive ---------- */
@media (max-width:900px){
  #hero-ui{display:flex;flex-direction:column;justify-content:space-between;gap:.5rem;inset:1rem}
  .hero-main{position:absolute;bottom:30%;left:0;width:100%;transform:translateY(50%)}
  .hero-title{white-space:normal;font-size:2.9rem;line-height:1.05}
  .hero-footer{flex-direction:column;align-items:center;width:100%;margin-bottom:1rem;transform:none}
  .hero-footer .footer-left{display:none!important}
  body:not(.section-0-active) .footer-center{display:none!important}
  .section-content{display:flex;flex-direction:column;justify-content:flex-end;
    align-items:flex-start;padding:1.4rem;padding-bottom:6.5rem}
  .content-wrap{width:100%;gap:.6rem}
  .section-title{font-size:2.4rem}
  .section-desc{width:100%;font-size:.8rem}
  .spec-row{gap:1.5rem}
  #configurator{right:1rem;left:1rem;width:auto;top:auto;bottom:1rem;
    transform:translateY(1.5rem);padding:1rem}
  #configurator.show{transform:translateY(0)}
  .cfg-hint,.hero-scroll-indicator,#cursor-canvas,.footer-right{display:none}
  .chips{flex-direction:row;flex-wrap:wrap}
}