/* =====================================================================
   Engram — Cinematic. One persistent memory volume you fly through,
   sticky chapter copy crossfading over it. Dark, filmic, restrained.
   Satoshi display + Geist body + Geist Mono labels.
   ===================================================================== */
:root{
  --disp:"Satoshi","Geist","Helvetica Neue",Arial,sans-serif;
  --body:"Geist","Helvetica Neue",Arial,sans-serif;
  --mono:"Geist Mono",ui-monospace,Consolas,monospace;
  --ink:#f4f2ef; --dim:#b9b6b1; --mute:#7d7a76; --line:rgba(255,255,255,.14);
  --acc:#ff7a1a; --acc2:#ffb066;
  --gut:clamp(22px,5vw,90px); --maxw:1280px;
  --e1:cubic-bezier(.22,1,.36,1); --e2:cubic-bezier(.65,0,.35,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{font-family:var(--body);background:#000;color:var(--ink);line-height:1.5;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
em{font-style:normal;color:#fff}
::selection{background:var(--acc);color:#0a0400}
:where(a,button):focus-visible{outline:2px solid var(--acc);outline-offset:4px;border-radius:3px}

/* persistent world */
#world{position:fixed;inset:0;width:100%;height:100%;z-index:0;display:block}

/* filmic grade: vignette + grain (static => capture-safe) */
.filmic{position:fixed;inset:0;z-index:1;pointer-events:none;
  background:radial-gradient(130% 100% at 50% 42%,transparent 38%,rgba(0,0,0,.5) 78%,rgba(0,0,0,.86) 100%);}
.filmic::after{content:"";position:absolute;inset:0;opacity:.05;mix-blend-mode:soft-light;
  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='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}
html.capture .filmic::after{display:none}

/* chrome */
.chrome{position:fixed;top:0;left:0;right:0;z-index:6;display:flex;align-items:center;justify-content:space-between;
  padding:22px var(--gut);transition:opacity .6s var(--e1),transform .6s var(--e1)}
.chrome.hide{opacity:0;transform:translateY(-12px);pointer-events:none}
.brand{display:flex;align-items:center;gap:10px}
.brand-mark svg{fill:none;stroke:var(--acc);stroke-width:1.4;stroke-linejoin:round}
.brand-name{font-family:var(--disp);font-weight:700;font-size:17px;letter-spacing:.12em;text-transform:uppercase}
.chrome-nav{display:flex;align-items:center;gap:22px;font-family:var(--mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase}
.chrome-nav a{color:var(--dim);transition:color .25s}.chrome-nav a:hover{color:#fff}
.chrome-nav .chip{color:#0a0400;background:var(--acc);padding:8px 14px;border-radius:100px;font-weight:500;letter-spacing:.06em}
.chrome-nav .chip:hover{color:#0a0400;background:var(--acc2)}

/* progress rail */
.rail{position:fixed;right:max(18px,calc(var(--gut) - 40px));top:50%;transform:translateY(-50%);z-index:6;width:1px;height:160px;background:rgba(255,255,255,.14)}
.rail-fill{position:absolute;top:0;left:-1px;width:3px;height:0;background:var(--acc);box-shadow:0 0 10px var(--acc);transition:height .15s linear}
@media (max-width:760px){.rail{display:none}}

/* chapters: sticky stage, scroll provides travel */
main{position:relative;z-index:2}
.chapter{position:relative;min-height:165vh}
.chapter.hero{min-height:130vh}
.chapter.close{min-height:120vh}
.chapter-inner{position:sticky;top:0;height:100vh;display:flex;align-items:center;padding:0 var(--gut)}
.block{max-width:var(--maxw);width:100%;margin:0 auto}
.hero .block{max-width:980px}

/* type */
.eyebrow{display:inline-block;font-family:var(--mono);font-size:12px;letter-spacing:.32em;text-transform:uppercase;color:var(--acc);margin-bottom:26px}
.display{font-family:var(--disp);font-weight:900;text-transform:uppercase;line-height:.9;letter-spacing:-.018em;font-size:clamp(2.9rem,8.5vw,8.2rem)}
.hero .display{font-size:clamp(3rem,10vw,9.4rem)}
.display .ln{display:block}
.display.big{font-size:clamp(3rem,9.5vw,9rem)}
.ghost{color:transparent;-webkit-text-stroke:1.3px rgba(255,255,255,.55)}
.acc{color:var(--acc)}
.lead{max-width:54ch;margin-top:30px;font-size:clamp(1.05rem,1.5vw,1.32rem);line-height:1.55;color:var(--dim)}
.fine{max-width:60ch;margin-top:22px;font-size:14px;line-height:1.6;color:var(--mute);border-left:2px solid rgba(255,122,26,.5);padding-left:16px}
.fine b{color:var(--dim);font-weight:600}
.perimeter{border-left:none;padding-left:0;max-width:64ch;font-family:var(--mono);font-size:12px;letter-spacing:.03em}

/* actions */
.actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:38px}
.actions.center{justify-content:flex-start}
.btn{display:inline-flex;align-items:center;gap:8px;font-family:var(--body);font-weight:500;font-size:15px;padding:14px 26px;border-radius:100px;border:1px solid transparent;transition:transform .25s var(--e1),background .25s,border-color .25s,color .25s}
.btn-solid{background:#fff;color:#0a0a0a}
.btn-solid:hover{transform:translateY(-2px);background:var(--acc);color:#0a0400}
.btn-line{border-color:var(--line);color:var(--ink)}
.btn-line:hover{transform:translateY(-2px);border-color:#fff}

/* receipt families */
.families{list-style:none;display:flex;flex-wrap:wrap;gap:10px 0;margin-top:34px;max-width:760px}
.families li{font-family:var(--mono);font-size:13px;letter-spacing:.04em;color:var(--dim);padding:0 18px;position:relative}
.families li:first-child{padding-left:0}
.families li::before{content:"";position:absolute;left:0;top:50%;width:4px;height:4px;border-radius:50%;background:var(--acc);transform:translateY(-50%)}
.families li:first-child::before{display:none}

/* evidence stats */
.stats{display:grid;grid-template-columns:repeat(4,auto);gap:clamp(28px,5vw,72px);margin:10px 0 0}
.stat b{font-family:var(--disp);font-weight:900;font-size:clamp(2.6rem,6vw,5rem);line-height:1;display:block;letter-spacing:-.02em;font-variant-numeric:tabular-nums;color:#fff}
.stat span{display:block;margin-top:12px;font-family:var(--mono);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--mute)}
@media (max-width:760px){.stats{grid-template-columns:1fr 1fr;gap:34px}}

/* scroll cue */
.scroll-cue{position:absolute;left:var(--gut);bottom:6vh;display:flex;align-items:center;gap:12px;font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--mute)}
.scroll-cue i{width:1px;height:40px;background:linear-gradient(var(--acc),transparent);position:relative;overflow:hidden}
.scroll-cue i::after{content:"";position:absolute;left:0;top:0;width:1px;height:14px;background:#fff;animation:drop 1.8s var(--e2) infinite}
@keyframes drop{0%{transform:translateY(-14px);opacity:0}40%{opacity:1}100%{transform:translateY(40px);opacity:0}}

/* reveal */
.reveal{opacity:0;transform:translateY(34px);transition:opacity 1s var(--e1),transform 1s var(--e1)}
.reveal.in{opacity:1;transform:none}
.reveal[data-reveal-delay="1"]{transition-delay:.08s}
.reveal[data-reveal-delay="2"]{transition-delay:.16s}
.reveal[data-reveal-delay="3"]{transition-delay:.24s}
.reveal[data-reveal-delay="4"]{transition-delay:.32s}

@media (max-width:600px){
  .chapter{min-height:150vh}
  .actions{margin-top:30px}
}

/* =========================================================
   Enriched content — flowing panels over the same world.
   Dense info lives here so cinematic chapters stay clean.
   ========================================================= */
.panel{position:relative;z-index:2;padding:clamp(86px,15vh,168px) var(--gut)}
.panel .block{max-width:var(--maxw);margin:0 auto}
.display.sm{font-size:clamp(1.95rem,4.6vw,3.6rem);text-transform:none;line-height:1.04;letter-spacing:-.02em;font-weight:900}
.panel .lead{margin-top:24px}

/* problem / generic bullets */
.bullets{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:24px 52px;margin-top:38px;max-width:940px}
.bullets li{position:relative;display:flex;flex-direction:column;gap:6px;padding-left:20px}
.bullets li::before{content:"";position:absolute;left:0;top:9px;width:5px;height:5px;border-radius:50%;background:var(--acc)}
.bullets b{font-family:var(--disp);font-weight:700;font-size:1.06rem;color:var(--ink);letter-spacing:.01em}
.bullets span{font-size:.95rem;color:var(--dim);line-height:1.5}
@media(max-width:720px){.bullets{grid-template-columns:1fr;gap:20px}}

/* feature / path cards */
.cards{list-style:none;display:grid;gap:16px;margin-top:8px}
.cards.four{grid-template-columns:repeat(4,1fr)}
.cards li{display:flex;flex-direction:column;gap:10px;border:1px solid var(--line);border-radius:16px;padding:24px 22px 26px;background:rgba(8,7,6,.55);transition:border-color .3s var(--e1),transform .3s var(--e1)}
.cards li:hover{border-color:rgba(255,122,26,.55);transform:translateY(-3px)}
.cards .k{font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--acc)}
.cards .k i{font-style:normal;color:var(--mute);letter-spacing:.08em}
.cards b{font-family:var(--disp);font-weight:700;font-size:1.18rem;color:var(--ink);line-height:1.1}
.cards p{font-size:.94rem;color:var(--dim);line-height:1.5}
@media(max-width:980px){.cards.four{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.cards.four{grid-template-columns:1fr}}

/* how-it-works steps */
.steps{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:38px}
.steps li{position:relative;border-top:1px solid var(--line);padding-top:20px;display:flex;flex-direction:column;gap:9px}
.steps li::before{content:"";position:absolute;top:-1px;left:0;width:42px;height:1px;background:var(--acc)}
.steps .k{font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--acc)}
.steps b{font-family:var(--disp);font-weight:700;font-size:1.08rem;color:var(--ink)}
.steps p{font-size:.92rem;color:var(--dim);line-height:1.5}
@media(max-width:980px){.steps{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.steps{grid-template-columns:1fr}}

/* code / trust loop */
.code{margin-top:30px;border:1px solid var(--line);border-radius:14px;background:rgba(5,5,6,.78);overflow:auto;max-width:940px;scroll-margin-top:90px}
.code pre{font-family:var(--mono);font-size:13.5px;line-height:1.95;color:#d7d3cc;padding:22px 24px;white-space:pre}
.code .c{color:var(--mute)}
.code .ok{color:var(--acc2)}
@media(max-width:560px){.code pre{font-size:11.5px;line-height:1.8}}

/* connectors */
.connectors{margin-top:46px}
.connectors-label{display:block;font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--mute);margin-bottom:16px}
.connectors ul{list-style:none;display:flex;flex-wrap:wrap;gap:10px}
.connectors li{font-family:var(--mono);font-size:12.5px;color:var(--dim);border:1px solid var(--line);border-radius:100px;padding:8px 16px;transition:border-color .25s,color .25s}
.connectors li:hover{border-color:rgba(255,122,26,.5);color:var(--ink)}

/* trust boundaries */
.bounds{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:16px 44px;margin-top:36px;max-width:980px}
.bounds li{position:relative;padding-left:30px;font-size:1rem;line-height:1.55;color:var(--dim)}
.bounds b{color:var(--ink);font-family:var(--disp);font-weight:700}
.bounds li::before{position:absolute;left:0;top:0;font-family:var(--mono);font-size:15px;font-weight:700}
.bounds .can::before{content:"\2713";color:var(--acc2)}
.bounds .cant::before{content:"\2715";color:var(--mute)}
@media(max-width:720px){.bounds{grid-template-columns:1fr}}

/* docs grid */
.docs-grid{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:36px}
.docs-grid a{display:flex;flex-direction:column;gap:7px;height:100%;border:1px solid var(--line);border-radius:14px;padding:20px 18px;transition:border-color .25s,transform .25s,background .25s}
.docs-grid a:hover{border-color:rgba(255,122,26,.55);transform:translateY(-3px);background:rgba(255,122,26,.05)}
.docs-grid b{font-family:var(--disp);font-weight:700;font-size:1.02rem;color:var(--ink)}
.docs-grid span{font-size:.86rem;color:var(--mute);line-height:1.45}
@media(max-width:980px){.docs-grid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.docs-grid{grid-template-columns:1fr}}

/* responsive nav: collapse to the Install chip on small screens */
@media(max-width:880px){.chrome-nav a:not(.chip){display:none}}

/* capture + reduced motion */
html.capture *,html.capture *::before,html.capture *::after{animation:none!important;transition:none!important}
html.capture .reveal{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none}
  .scroll-cue i::after{animation:none}
}