:root{
  --void:#050807; --ivory:#F2EDE0; --ivory-dim:rgba(242,237,224,.55); --ivory-faint:rgba(242,237,224,.10);
  --brass:#C89B3C; --brass-hi:#E8C06A; --chalk:#4F7A8C; --red:#A63D36;
  --hair:rgba(242,237,224,.12);
  --ease:cubic-bezier(.16,1,.3,1); --slow:1.1s; --pad:clamp(22px,6vw,110px);
  --disp:"Playfair Display","Frank Ruhl Libre",Georgia,serif;
  --he-disp:"Frank Ruhl Libre","Playfair Display",Georgia,serif;
  color-scheme:dark;
}
*{box-sizing:border-box;margin:0}
html{background:var(--void);-webkit-text-size-adjust:100%}
body{font-family:Rubik,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;color:var(--ivory);background:var(--void);overflow-x:hidden;-webkit-font-smoothing:antialiased}
body.loading{overflow:hidden}
[lang=he] .display,[dir=rtl] .display{font-family:var(--he-disp)}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
:focus-visible{outline:1.5px solid var(--brass);outline-offset:5px;border-radius:3px}
.skip{position:fixed;top:-60px;inset-inline-start:16px;z-index:100;background:var(--ivory);color:#111;padding:10px 14px;border-radius:4px}
.skip:focus{top:14px}

/* loader */
#loader{position:fixed;inset:0;z-index:90;background:var(--void);display:grid;place-items:center;align-content:center;gap:26px;transition:opacity 1s var(--ease),visibility 1s}
body.ready #loader{opacity:0;visibility:hidden}
.l-lamp{width:3px;height:70px;background:linear-gradient(#0d0d0d,#1a1a1a);position:relative;margin:0 auto}
.l-lamp i{position:absolute;left:50%;bottom:-4px;width:7px;height:7px;margin-left:-3.5px;border-radius:50%;background:var(--brass-hi);box-shadow:0 0 34px 12px rgba(232,192,106,.5);opacity:.3;animation:flick 1.8s infinite}
@keyframes flick{0%,100%{opacity:.3}40%{opacity:1}52%{opacity:.4}66%{opacity:.95}}
.l-word{font-family:var(--he-disp);font-size:16px;letter-spacing:.02em;color:var(--ivory-dim)}
.l-bar{width:150px;height:1px;background:var(--hair);overflow:hidden}
.l-bar i{display:block;height:100%;width:0;background:var(--brass);transition:width .5s var(--ease)}

/* world */
#world{position:fixed;inset:0;z-index:0}
#world canvas{display:block;width:100%;height:100%}
.grain{position:fixed;inset:-50%;z-index:2;pointer-events:none;opacity:.03;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");animation:grain 1.4s steps(5) infinite}
@keyframes grain{0%{transform:translate(0,0)}25%{transform:translate(-3%,2%)}50%{transform:translate(2%,-2%)}75%{transform:translate(-2%,-1%)}100%{transform:translate(0,0)}}
.vignette{position:fixed;inset:0;z-index:1;pointer-events:none;background:
  radial-gradient(130% 90% at 50% 42%,transparent 38%,rgba(5,8,7,.82) 100%),
  linear-gradient(to var(--vg,left),rgba(5,8,7,.78) 0%,rgba(5,8,7,.25) 32%,transparent 54%);transition:opacity .8s}
[dir=ltr] .vignette{--vg:right}
body.centered .vignette{opacity:.4}

/* chrome */
.top{position:fixed;inset:0 0 auto;z-index:20;display:flex;align-items:center;justify-content:space-between;padding:24px var(--pad);pointer-events:none}
.top>*{pointer-events:auto}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--disp);font-size:18px;letter-spacing:.01em;direction:ltr;unicode-bidi:isolate}
.brand-dot{width:11px;height:11px;border-radius:50%;background:radial-gradient(circle at 34% 30%,#fff,#f2ede0 45%,#b9b3a3);box-shadow:0 0 0 1px rgba(255,255,255,.15),0 3px 12px rgba(0,0,0,.6)}
.langs{display:flex;gap:1px}
.langs button{font-size:11px;letter-spacing:.14em;padding:7px 9px;color:var(--ivory-dim);transition:color .3s;text-transform:uppercase}
.langs button[aria-pressed=true]{color:var(--brass)}
.langs button:hover{color:var(--ivory)}

.rail{position:fixed;inset-inline-end:calc(var(--pad) * .38);top:50%;transform:translateY(-50%);z-index:20;display:flex;flex-direction:column;gap:20px}
.rail button{display:flex;align-items:center;gap:10px;opacity:.4;transition:opacity .5s var(--ease)}
.rail em{font-family:var(--disp);font-style:italic;font-size:11px;color:var(--ivory-dim);min-width:16px;text-align:center;transition:color .4s}
.rail span{width:18px;height:1px;background:var(--ivory);transition:all .5s var(--ease)}
.rail button[aria-current=true]{opacity:1}
.rail button[aria-current=true] span{width:30px;background:var(--brass)}
.rail button[aria-current=true] em{color:var(--brass)}
[dir=rtl] .rail button{flex-direction:row-reverse}

.progress{position:fixed;inset:auto 0 0;height:1px;z-index:20}
.progress i{display:block;height:100%;width:100%;background:var(--brass);transform-origin:var(--po,left);transform:scaleX(0)}
[dir=rtl] .progress i{--po:right}

/* story overlay */
#track{height:1600vh}
#story{position:fixed;inset:0;z-index:10;pointer-events:none}
.panel{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;padding:120px var(--pad) 100px;visibility:hidden}
.panel.on{visibility:visible}
.panel.on .actions a,.panel.on .grades li{pointer-events:auto}
.ch-path,.ch-drill,.ch-people{max-width:min(680px,52vw)}

/* big chapter numeral as texture */
.bignum{position:absolute;font-family:var(--disp);font-style:italic;font-weight:500;font-size:clamp(180px,30vw,420px);line-height:.7;color:var(--ivory);opacity:.05;z-index:-1;top:8%;inset-inline-start:calc(var(--pad) - .1em);pointer-events:none;user-select:none}

.micro{display:flex;align-items:center;gap:12px;font-size:11px;font-weight:500;letter-spacing:.22em;text-transform:uppercase;color:var(--ivory-dim);margin-bottom:28px}
[dir=rtl] .micro{letter-spacing:.06em}
.micro .rule{width:24px;height:1px;background:var(--brass);flex:none}

.display{font-family:var(--disp);font-weight:700;line-height:.95;letter-spacing:-.025em;font-size:clamp(64px,11vw,160px)}
[dir=rtl] .display{line-height:1;letter-spacing:-.005em}
.display.sm{font-size:clamp(46px,6.4vw,104px)}
.body{font-size:clamp(16px,1.3vw,19px);font-weight:300;line-height:1.62;color:var(--ivory-dim);max-width:34em;margin-top:30px}

/* line reveal */
.line{display:block;overflow:hidden;padding-bottom:.1em;margin-bottom:-.1em}
.line>span{display:inline-block;transform:translateY(112%);transition:transform var(--slow) var(--ease)}
.panel.on .line>span{transform:none}
.panel.on .line:nth-child(2)>span{transition-delay:.09s}
.reveal{opacity:0;transform:translateY(16px);filter:blur(5px);transition:opacity .9s var(--ease),transform .9s var(--ease),filter .9s var(--ease)}
.panel.on .reveal{opacity:1;transform:none;filter:none;transition-delay:.22s}
.panel.on .micro.reveal{transition-delay:0s}
.panel.leaving .line>span{transform:translateY(-112%);transition-duration:.55s;transition-delay:0s!important}
.panel.leaving .reveal{opacity:0;transform:translateY(-12px);filter:blur(5px);transition-duration:.45s;transition-delay:0s!important}

/* hero */
.ch-hero{justify-content:flex-end;padding-bottom:12vh}
.ch-hero .display{margin-inline-start:-.02em}
.actions{margin-top:38px}
.scrollhint{display:flex;align-items:center;gap:12px;margin-top:46px;font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--ivory-dim)}
[dir=rtl] .scrollhint{letter-spacing:.06em}
.mouse{width:20px;height:32px;border:1px solid rgba(242,237,224,.4);border-radius:11px;position:relative}
.mouse i{position:absolute;left:50%;top:7px;width:2px;height:6px;margin-left:-1px;border-radius:2px;background:var(--brass);animation:wheel 1.9s var(--ease) infinite}
@keyframes wheel{0%{opacity:0;transform:translateY(-3px)}30%{opacity:1}100%{opacity:0;transform:translateY(9px)}}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:10px;font-size:15px;font-weight:500;letter-spacing:.01em;padding:17px 30px;border-radius:999px;transition:transform .5s var(--ease),background .35s,color .35s,border-color .35s}
.btn.ghost{border:1px solid var(--brass);color:var(--brass)}
.btn.ghost:hover{background:rgba(200,155,60,.1);color:var(--brass-hi);border-color:var(--brass-hi)}
.btn.filled{background:var(--brass);color:#15100a}
.btn.filled:hover{background:var(--brass-hi);transform:translateY(-2px)}

/* CH.1 grades */
.grades{list-style:none;display:flex;gap:0;margin-top:40px;border-top:1px solid var(--hair)}
.grades li{flex:1;padding:18px 10px 0;border-inline-end:1px solid var(--hair);display:flex;flex-direction:column;gap:7px;transition:background .4s}
.grades li:last-child{border-inline-end:0}
.grades li b{font-family:var(--disp);font-size:clamp(30px,3.4vw,52px);font-weight:700;line-height:1;color:var(--ivory)}
.grades li i{font-style:normal;font-size:12px;letter-spacing:.04em;color:var(--ivory-dim)}
.grades li:hover,.grades li.hot{background:linear-gradient(to bottom,rgba(200,155,60,.08),transparent)}
.grades li:hover b,.grades li.hot b{color:var(--brass)}

/* CH.2 datapoint */
.datapoint{margin-top:30px;font-size:15px;display:inline-flex;align-items:baseline;gap:8px}
.datapoint b{font-weight:500;color:var(--chalk);letter-spacing:.02em;border:1px solid rgba(79,122,140,.4);padding:7px 13px;border-radius:999px}
.datapoint span{color:var(--ivory-dim);font-size:13px}

/* CH.3 columns */
.cols{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin-top:40px}
.col{padding:22px 20px 0;border-top:1px solid var(--hair)}
.col-k{font-family:var(--disp);font-style:italic;font-size:20px;color:var(--brass);display:block;margin-bottom:12px}
.col p{font-size:14px;font-weight:300;line-height:1.58;color:var(--ivory-dim)}

/* CH.4 app */
.ch-app{flex-direction:row;align-items:center;justify-content:space-between;gap:6vw;max-width:none}
.app-copy{max-width:540px;flex:1;position:relative}
.stats{list-style:none;display:flex;gap:40px;margin-top:38px}
.stats li{display:flex;flex-direction:column;gap:6px}
.stats b{font-family:var(--disp);font-size:clamp(34px,4vw,56px);font-weight:700;line-height:1;color:var(--ivory)}
.stats b i{font-style:italic;font-size:.5em;color:var(--brass);font-weight:500}
.stats span{font-size:12px;color:var(--ivory-dim);letter-spacing:.03em}
.phone-wrap{perspective:1500px;flex:0 0 auto}
.phone{position:relative;width:min(290px,23vw);aspect-ratio:390/844;border-radius:42px;padding:10px;background:linear-gradient(150deg,#1c1f1d,#09 40%,#16);background:linear-gradient(150deg,#22231f,#0a0c0b 45%,#17191a);box-shadow:0 0 0 1px rgba(242,237,224,.08) inset,0 50px 110px -24px rgba(0,0,0,.85);transform:rotateY(var(--ry,-16deg)) rotateX(var(--rx,7deg)) translateY(var(--ty,70px));opacity:var(--po,0);transition:opacity .6s;will-change:transform}
.screen{position:relative;width:100%;height:100%;border-radius:33px;overflow:hidden;background:#0a1410}
.screen img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:top;opacity:0;transform:scale(1.03);transition:opacity .7s var(--ease),transform .9s var(--ease)}
.screen img.cur{opacity:1;transform:none}
.notch{position:absolute;top:19px;left:50%;width:80px;height:22px;margin-left:-40px;border-radius:18px;background:#000}

/* CH.5 close */
.ch-close{align-items:center;text-align:center;justify-content:center}
.ch-close .actions{margin-top:44px}
.foot{margin-top:40px;font-size:11px;letter-spacing:.04em;color:rgba(242,237,224,.35);max-width:30em}

/* ---------- mobile ---------- */
@media (max-width:768px){
  .top{padding:16px 20px}
  .brand{font-size:16px}
  .rail{inset-inline-end:8px;gap:12px}
  .rail em{display:none}
  .rail span{width:12px}
  .rail button[aria-current=true] span{width:22px}
  .vignette{background:radial-gradient(140% 85% at 50% 32%,transparent 36%,rgba(5,8,7,.78) 100%),linear-gradient(to top,rgba(5,8,7,.96) 0%,rgba(5,8,7,.66) 36%,transparent 60%)}
  .panel{justify-content:flex-end;padding:100px 24px calc(72px + env(safe-area-inset-bottom));max-width:none}
  .ch-path,.ch-drill,.ch-people{max-width:none}
  .display{font-size:clamp(56px,16vw,88px)}
  .display.sm{font-size:clamp(40px,11vw,60px)}
  .body{font-size:15px;margin-top:20px}
  .bignum{font-size:clamp(150px,44vw,240px);top:auto;bottom:34vh;opacity:.045}
  .ch-hero{padding-bottom:calc(66px + env(safe-area-inset-bottom))}
  .grades{margin-top:26px}
  .grades li b{font-size:30px}.grades li i{font-size:11px}
  .cols{grid-template-columns:1fr;gap:0}
  .col{padding:14px 0}.col-k{margin-bottom:6px;font-size:18px}
  .col p{font-size:13px}
  .ch-app{flex-direction:column-reverse;justify-content:flex-end;align-items:stretch;gap:18px;padding-top:92px}
  .phone-wrap{align-self:center}
  .phone{width:min(44vw,180px);border-radius:28px;padding:7px}
  .screen{border-radius:22px}.notch{top:12px;width:52px;height:15px;margin-left:-26px}
  .stats{gap:26px;margin-top:22px}
  .stats b{font-size:34px}.stats span{font-size:11px}
  .btn{padding:16px 26px;font-size:15px}
}
@media (max-width:768px) and (max-height:720px){
  .phone{width:min(34vw,140px)}
  .stats li:last-child{display:none}
}

/* ---------- static (reduced motion / no WebGL) ---------- */
body.static #track,body.static .rail,body.static .progress,body.static .grain,body.static .scrollhint{display:none}
body.static #world{background:var(--void) url(assets/poster.jpg) center/cover no-repeat;opacity:.3}
body.static #story{position:relative;pointer-events:auto}
body.static .panel{position:relative;visibility:visible;min-height:auto;padding-top:104px;padding-bottom:84px;max-width:920px}
body.static .ch-hero{min-height:100svh}
body.static .ch-app{flex-direction:column;align-items:flex-start}
body.static .line>span,body.static .reveal{transform:none!important;opacity:1!important;filter:none!important;transition:none!important}
body.static .phone{--po:1;--ry:0deg;--rx:0deg;--ty:0px}
body.static .screen img[data-shot=home]{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.grain,.mouse i,.l-lamp i{animation:none}}