/* ============================================================
   CosmoBrain — cosmos visual system
   ============================================================ */
:root{
  --bg:#04060e;
  --bg-2:#070b18;
  --ink:#eaf1ff;
  --muted:#8a97b8;
  --faint:#586183;
  --line:rgba(140,170,255,.14);
  --line-2:rgba(140,170,255,.07);
  --glass:rgba(125,150,220,.045);
  --glass-2:rgba(125,150,220,.08);

  --cyan:#56d8ff;
  --blue:#3a7bff;
  --violet:#9a7bff;
  --magenta:#cf76ff;
  --gold:#ffd6a3;

  --disp:"Space Grotesk",system-ui,sans-serif;
  --mono:"Space Mono","SFMono-Regular",ui-monospace,monospace;

  --maxw:1180px;
  --rail-w:230px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shell-x:clamp(20px,5vw,72px);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--disp);
  font-size:18px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body:not(.ready){overflow:hidden;height:100vh}
a{color:inherit;text-decoration:none}
::selection{background:rgba(86,216,255,.28);color:#fff}

/* ---------- ambient background ---------- */
#starfield{
  position:fixed;inset:0;width:100%;height:100%;
  z-index:0;pointer-events:none;
}
.nebula{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.nebula__blob{
  position:absolute;border-radius:50%;filter:blur(90px);opacity:.5;
  will-change:transform;
}
.nebula__blob--1{width:60vw;height:60vw;left:-15vw;top:-10vh;
  background:radial-gradient(circle,rgba(58,123,255,.30),transparent 62%);}
.nebula__blob--2{width:55vw;height:55vw;right:-18vw;top:25vh;
  background:radial-gradient(circle,rgba(154,123,255,.24),transparent 62%);}
.nebula__blob--3{width:48vw;height:48vw;left:18vw;bottom:-22vh;
  background:radial-gradient(circle,rgba(86,216,255,.18),transparent 62%);}

.orbits{position:fixed;inset:0;z-index:0;pointer-events:none;
  display:grid;place-items:center;overflow:hidden;opacity:.5}
.orbit{position:absolute;border-radius:50%;border:1px solid var(--line-2);
  border-top-color:rgba(86,216,255,.20);}
.orbit--1{width:120vmin;height:120vmin;animation:spin 90s linear infinite}
.orbit--2{width:80vmin;height:80vmin;border-top-color:rgba(154,123,255,.18);animation:spin 60s linear infinite reverse}
.orbit--3{width:160vmin;height:160vmin;border-top-color:rgba(58,123,255,.14);animation:spin 140s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

.grain{position:fixed;inset:0;z-index:1;pointer-events:none;opacity:.05;
  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'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode:overlay;}

/* vignette */
body::after{content:"";position:fixed;inset:0;z-index:1;pointer-events:none;
  background:radial-gradient(140% 100% at 50% 0%,transparent 55%,rgba(2,3,8,.7) 100%);}

/* ============================================================
   LOADER
   ============================================================ */
.loader{position:fixed;inset:0;z-index:200;background:#03050c;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:34px;
  transition:opacity .8s var(--ease),visibility .8s;}
.loader.done{opacity:0;visibility:hidden}
.loader__mark{font-family:var(--mono);letter-spacing:.62em;font-size:13px;
  color:var(--cyan);padding-left:.62em;text-shadow:0 0 18px rgba(86,216,255,.5)}
.loader__grid{display:grid;grid-template-columns:repeat(12,1fr);gap:7px;width:min(360px,68vw)}
.lg__cell{aspect-ratio:1;background:rgba(140,170,255,.07);border:1px solid var(--line-2);
  transition:background .25s,box-shadow .25s}
.lg__cell.on{background:rgba(86,216,255,.7);box-shadow:0 0 12px rgba(86,216,255,.6)}
.loader__row{display:flex;align-items:baseline;gap:18px;font-family:var(--mono);
  font-size:12px;letter-spacing:.28em;color:var(--faint)}
.loader__pct{color:var(--ink);font-weight:700;letter-spacing:.1em;min-width:48px;text-align:right}

/* ============================================================
   TOP BAR
   ============================================================ */
.topbar{position:fixed;top:0;left:0;right:0;z-index:60;
  display:flex;align-items:center;justify-content:space-between;
  padding:22px var(--shell-x);
  background:linear-gradient(180deg,rgba(4,6,14,.72),transparent);
  opacity:0;transform:translateY(-12px);transition:opacity .7s var(--ease) .2s,transform .7s var(--ease) .2s}
.ready .topbar{opacity:1;transform:none}
.brand{display:flex;align-items:center;gap:11px}
.brand__dot{width:9px;height:9px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 14px var(--cyan);animation:pulse 2.6s ease-in-out infinite}
@keyframes pulse{50%{opacity:.45;transform:scale(.8)}}
.brand__name{font-family:var(--mono);font-weight:700;letter-spacing:.34em;font-size:14px;padding-left:.34em}
.topbar__actions{display:flex;gap:12px}
.hbtn{position:relative;display:inline-flex;align-items:center;gap:10px;cursor:pointer;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.26em;font-weight:700;
  padding:13px 22px;color:var(--ink);border:none;background:none;
  clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
  transition:color .3s}
.hbtn__sq{width:7px;height:7px;background:currentColor;display:inline-block;transition:transform .3s}
.hbtn--ghost{background:rgba(125,150,220,.07);outline:1px solid var(--line)}
.hbtn--ghost:hover{background:rgba(86,216,255,.12);color:#fff}
.hbtn--solid{background:linear-gradient(120deg,var(--blue),var(--cyan));color:#03050c}
.hbtn--solid:hover{filter:brightness(1.12)}
.hbtn:hover .hbtn__sq{transform:rotate(45deg)}

/* ============================================================
   RAIL NAV (left)
   ============================================================ */
.rail{position:fixed;left:var(--shell-x);top:50%;transform:translateY(-50%);z-index:55;
  display:flex;flex-direction:column;gap:2px;padding-left:18px;
  max-height:70vh;
  opacity:0;transition:opacity .8s var(--ease) .4s}
.ready .rail{opacity:1}
.rail__line{position:absolute;left:2px;top:6px;bottom:6px;width:1px;background:var(--line)}
.rail__item{display:flex;align-items:center;gap:12px;background:none;border:none;cursor:pointer;
  padding:5px 0;color:var(--faint);font-family:var(--mono);text-align:left;
  position:relative;transition:color .3s}
.rail__item::before{content:"";position:absolute;left:-17px;top:50%;transform:translateY(-50%) scale(.6);
  width:6px;height:6px;background:var(--cyan);opacity:0;transition:opacity .3s,transform .3s;
  box-shadow:0 0 10px var(--cyan)}
.rail__num{font-size:11px;letter-spacing:.12em;width:20px}
.rail__label{font-size:11px;letter-spacing:.16em;text-transform:uppercase;max-width:0;overflow:hidden;
  white-space:nowrap;opacity:0;transition:max-width .4s var(--ease),opacity .35s}
.rail__item:hover{color:var(--muted)}
.rail__item:hover .rail__label{max-width:200px;opacity:1}
.rail__item.active{color:#fff}
.rail__item.active::before{opacity:1;transform:translateY(-50%) scale(1)}
.rail__item.active .rail__label{max-width:200px;opacity:1}

/* ============================================================
   SCENE / LAYOUT
   ============================================================ */
main{position:relative;z-index:2}
.scene{position:relative;min-height:100vh;display:flex;align-items:center;
  padding:140px var(--shell-x) 130px;
  padding-left:calc(var(--shell-x) + var(--rail-w));}
.scene__inner{width:100%;max-width:var(--maxw);margin:0 auto}

/* reveal */
[data-reveal]{opacity:0;transform:translateY(26px);
  transition:opacity .9s var(--ease),transform .9s var(--ease);
  transition-delay:calc(var(--i,0) * 90ms)}
.scene.is-visible [data-reveal]{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  [data-reveal]{opacity:1!important;transform:none!important}
  .orbit{animation:none}
}

/* eyebrow */
.eyebrow{display:flex;align-items:center;gap:16px;margin-bottom:30px;font-family:var(--mono)}
.eyebrow__num{font-size:13px;font-weight:700;letter-spacing:.1em;color:var(--cyan);
  padding:4px 10px;border:1px solid rgba(86,216,255,.3);background:rgba(86,216,255,.06)}
.eyebrow__rule{flex:0 0 56px;height:1px;background:linear-gradient(90deg,var(--cyan),transparent)}
.eyebrow__org{font-size:11px;letter-spacing:.22em;color:var(--faint);text-transform:uppercase}

/* titles */
.title{font-size:clamp(34px,5vw,62px);line-height:1.04;font-weight:700;letter-spacing:-.015em;
  margin:0 0 26px;max-width:18ch;text-wrap:balance}
.subtitle{font-size:clamp(18px,2vw,23px);color:var(--muted);max-width:46ch;margin:0 0 46px;
  font-weight:400;line-height:1.5}

/* prose */
.prose{color:var(--muted);font-size:17px;line-height:1.72;max-width:60ch;margin:0 0 18px}
.prose:last-child{margin-bottom:0}

/* note / standard / ref */
.note{margin:46px 0 0;font-family:var(--mono);font-size:13px;line-height:1.7;letter-spacing:.02em;
  color:var(--muted);max-width:88ch;padding:18px 22px;border-left:2px solid rgba(86,216,255,.45);
  background:linear-gradient(90deg,rgba(86,216,255,.05),transparent)}
.note--ref{color:var(--faint);border-left-color:rgba(140,170,255,.3);
  background:linear-gradient(90deg,rgba(140,170,255,.04),transparent);font-size:12.5px}
.standard{margin:40px 0 0;font-size:16px;color:var(--muted);max-width:80ch;line-height:1.7;
  display:flex;gap:16px;align-items:flex-start;flex-wrap:wrap}
.standard__tag{font-family:var(--mono);font-size:10.5px;letter-spacing:.24em;color:var(--gold);
  border:1px solid rgba(255,214,163,.34);padding:5px 10px;flex:none;margin-top:2px}

/* ============================================================
   CARDS (3 / 2)
   ============================================================ */
.cards{display:grid;gap:22px;margin-top:8px}
.cards--3{grid-template-columns:repeat(3,1fr)}
.cards--2{grid-template-columns:repeat(2,1fr)}
.cards--quad{grid-template-columns:repeat(2,1fr)}
.card{position:relative;padding:30px 28px 32px;background:var(--glass);
  border:1px solid var(--line);backdrop-filter:blur(8px);
  clip-path:polygon(0 0,calc(100% - 18px) 0,100% 18px,100% 100%,18px 100%,0 calc(100% - 18px));
  transition:transform .5s var(--ease),background .5s,border-color .5s,box-shadow .5s;overflow:hidden}
.card::before{content:"";position:absolute;inset:0;opacity:0;transition:opacity .5s;
  background:radial-gradient(120% 120% at 0% 0%,rgba(86,216,255,.12),transparent 60%)}
.card:hover{transform:translateY(-8px);border-color:rgba(86,216,255,.4);
  background:var(--glass-2);box-shadow:0 24px 60px -28px rgba(58,123,255,.6)}
.card:hover::before{opacity:1}
.card__idx{font-family:var(--mono);font-size:12px;letter-spacing:.16em;color:var(--cyan);opacity:.8}
.card__title{font-size:22px;font-weight:600;margin:16px 0 12px;letter-spacing:-.01em;position:relative}
.card__body{color:var(--muted);font-size:15.5px;line-height:1.66;margin:0;position:relative}

/* ============================================================
   TILES (grid 2/3)
   ============================================================ */
.cards--tile{gap:18px}
.anchor:has(.cards--skills){grid-template-columns:1fr;gap:30px}
.cards--skills{grid-template-columns:repeat(3,1fr)}
@media (max-width:680px){.cards--skills{grid-template-columns:1fr}}
.tile{position:relative;padding:26px 24px;border:1px solid var(--line);
  background:var(--glass);transition:transform .45s var(--ease),border-color .45s,background .45s;overflow:hidden}
.tile::after{content:"";position:absolute;left:0;top:0;width:0;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--violet));transition:width .5s var(--ease)}
.tile:hover{transform:translateY(-6px);border-color:rgba(86,216,255,.35);background:var(--glass-2)}
.tile:hover::after{width:100%}
.tile__idx{font-family:var(--mono);font-size:11px;color:var(--faint);letter-spacing:.14em}
.tile__title{font-size:19px;font-weight:600;margin:12px 0 9px}
.tile__body{color:var(--muted);font-size:14.5px;line-height:1.6;margin:0}

/* ============================================================
   ANCHOR (text + pills/skills)
   ============================================================ */
.anchor{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:start}
.anchor__text .prose{margin-bottom:22px}
.pills{display:flex;flex-direction:column;gap:14px}
.pill{padding:20px 22px;border:1px solid var(--line);background:var(--glass);
  border-left:2px solid var(--cyan);transition:transform .4s var(--ease),background .4s}
.pill:hover{transform:translateX(8px);background:var(--glass-2)}
.pill__title{display:block;font-family:var(--mono);font-size:12px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--cyan);margin-bottom:7px}
.pill__body{display:block;color:var(--muted);font-size:15px}

/* ============================================================
   ROW LIST (pipeline)
   ============================================================ */
.rowlist{display:flex;flex-direction:column;border-top:1px solid var(--line)}
.rowitem{display:grid;grid-template-columns:64px 230px 1fr;gap:24px;align-items:baseline;
  padding:24px 8px;border-bottom:1px solid var(--line);transition:background .4s,padding-left .4s var(--ease)}
.rowitem:hover{background:linear-gradient(90deg,rgba(86,216,255,.06),transparent);padding-left:20px}
.rowitem__idx{font-family:var(--mono);font-size:13px;color:var(--cyan)}
.rowitem__label{font-size:19px;font-weight:600}
.rowitem__desc{color:var(--muted);font-size:15.5px}

/* ============================================================
   LADDER (evidence)
   ============================================================ */
.ladder{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.rung{display:flex;align-items:center;gap:18px;padding:22px 24px;border:1px solid var(--line);
  background:var(--glass);transition:transform .4s var(--ease),border-color .4s,background .4s}
.rung:hover{transform:translateY(-5px);border-color:rgba(86,216,255,.4);background:var(--glass-2)}
.rung__n{flex:none;width:44px;height:44px;display:grid;place-items:center;border-radius:50%;
  font-family:var(--mono);font-weight:700;font-size:16px;color:var(--cyan);
  border:1px solid rgba(86,216,255,.4);background:rgba(86,216,255,.07)}
.rung__txt{font-size:16px;font-weight:500;line-height:1.4}
.callouts{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:30px;align-items:stretch}
.callout{margin:0;padding:22px 24px;font-size:17px;line-height:1.5;font-weight:500}
.callout--a{border:1px solid var(--line);background:var(--glass);color:var(--muted)}
.callout--b{border:1px solid rgba(86,216,255,.4);
  background:linear-gradient(120deg,rgba(58,123,255,.16),rgba(86,216,255,.08));color:#fff}
.callout--note{grid-column:1 / -1;font-family:var(--mono);font-size:13px;letter-spacing:.02em;
  line-height:1.7;color:var(--faint);background:none;padding:6px 0 0;border:none}

/* ============================================================
   ARCHITECTURE (flow + model cards)
   ============================================================ */
.flow{display:flex;flex-wrap:wrap;align-items:stretch;gap:12px;margin-bottom:34px}
.flow__node{flex:1 1 150px;min-width:140px;display:flex;flex-direction:column;gap:12px;
  padding:18px 18px;border:1px solid var(--line);background:var(--glass);position:relative;
  transition:transform .4s var(--ease),border-color .4s,background .4s}
.flow__node:hover{transform:translateY(-5px);border-color:rgba(154,123,255,.45);background:var(--glass-2)}
.flow__n{width:26px;height:26px;display:grid;place-items:center;font-family:var(--mono);
  font-size:13px;font-weight:700;color:#03050c;background:linear-gradient(120deg,var(--cyan),var(--violet))}
.flow__label{font-size:15px;font-weight:600;line-height:1.3}
.flow__arrow{display:flex;align-items:center;color:var(--faint);font-size:18px;flex:0 0 auto}
@media (max-width:680px){.flow__arrow{transform:rotate(90deg);width:100%;justify-content:center}}
.cards--model{gap:18px}
.modelcard{padding:24px 22px;border:1px solid var(--line);background:var(--glass);
  border-top:2px solid rgba(154,123,255,.5);transition:transform .4s var(--ease),background .4s}
.modelcard:hover{transform:translateY(-6px);background:var(--glass-2)}
.modelcard__title{font-family:var(--mono);font-size:13px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--violet);margin:0 0 10px}
.modelcard__body{color:var(--muted);font-size:14.5px;line-height:1.6;margin:0}

/* ============================================================
   STEP LIST (build path)
   ============================================================ */
.steplist{display:flex;flex-direction:column;gap:0;border-left:1px solid var(--line);margin-left:6px}
.stepitem{display:grid;grid-template-columns:90px 1fr;gap:26px;padding:26px 0 26px 30px;position:relative;
  border-bottom:1px solid var(--line-2)}
.stepitem::before{content:"";position:absolute;left:-5px;top:34px;width:9px;height:9px;border-radius:50%;
  background:var(--bg);border:1px solid var(--cyan);transition:background .4s,box-shadow .4s}
.stepitem:hover::before{background:var(--cyan);box-shadow:0 0 14px var(--cyan)}
.stepitem__n{font-family:var(--mono);font-size:24px;font-weight:700;color:rgba(86,216,255,.4)}
.stepitem__label{font-size:21px;font-weight:600;margin:0 0 8px}
.stepitem__desc{color:var(--muted);font-size:15.5px;line-height:1.6;margin:0;max-width:70ch}

/* ============================================================
   SOURCES
   ============================================================ */
.sources{display:flex;flex-direction:column;border-top:1px solid var(--line)}
.source{display:grid;grid-template-columns:54px 0.9fr 1.4fr;gap:22px;align-items:baseline;
  padding:20px 8px;border-bottom:1px solid var(--line);transition:background .4s,padding-left .4s var(--ease)}
.source:hover{background:linear-gradient(90deg,rgba(140,170,255,.06),transparent);padding-left:18px}
.source__idx{font-family:var(--mono);font-size:12px;color:var(--faint)}
.source__name{font-size:16px;font-weight:600}
.source__desc{color:var(--muted);font-size:14.5px;line-height:1.55}
.urls{margin:34px 0 0;font-family:var(--mono);font-size:12px;line-height:2;color:var(--faint);
  word-break:break-word;letter-spacing:.01em}

/* ============================================================
   HERO
   ============================================================ */
.scene--hero{padding-left:calc(var(--shell-x) + var(--rail-w));min-height:100vh}
.hero__web{position:absolute;inset:0;width:100%;height:100%;z-index:0;opacity:.9}
.hero__inner{position:relative;z-index:2}
.eyebrow--hero{margin-bottom:34px}
.hero__title{font-size:clamp(64px,13vw,180px);line-height:.92;font-weight:700;letter-spacing:-.03em;
  margin:0 0 8px;
  background:linear-gradient(180deg,#fff 30%,#bcd0ff);-webkit-background-clip:text;background-clip:text;
  color:transparent;text-shadow:0 0 80px rgba(86,216,255,.25)}
.hero__tagline{font-size:clamp(20px,3.2vw,38px);font-weight:500;letter-spacing:-.01em;margin:0 0 26px;
  color:var(--ink);max-width:20ch;line-height:1.12}
.hero__lead{font-size:clamp(16px,1.6vw,19px);color:var(--muted);max-width:56ch;line-height:1.65;margin:0 0 34px}
.chips{display:flex;flex-wrap:wrap;gap:12px}
.chip{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  padding:10px 18px;border:1px solid var(--line);background:var(--glass);color:var(--muted);
  transition:border-color .4s,color .4s,background .4s}
.chip:hover{border-color:rgba(86,216,255,.45);color:#fff;background:var(--glass-2)}
.hero__cue{position:absolute;left:calc(var(--shell-x) + var(--rail-w));bottom:60px;z-index:2;
  display:flex;align-items:center;gap:14px;font-family:var(--mono);font-size:11px;letter-spacing:.28em;
  color:var(--faint)}
.hero__cue-line{width:42px;height:1px;background:var(--cyan);transform-origin:left;animation:cue 2.4s var(--ease) infinite}
@keyframes cue{0%,100%{transform:scaleX(.3);opacity:.4}50%{transform:scaleX(1);opacity:1}}

/* ============================================================
   CTA
   ============================================================ */
.scene--cta{justify-content:center;text-align:center;padding-left:var(--shell-x)}
.scene--cta .hero__web--cta{opacity:.7}
.cta__inner{max-width:880px;text-align:center;position:relative;z-index:2}
.cta__title{font-size:clamp(48px,9vw,108px);font-weight:700;letter-spacing:-.02em;margin:0 0 30px;
  background:linear-gradient(180deg,#fff,#9fd6ff);-webkit-background-clip:text;background-clip:text;color:transparent}
.cta__body{margin:0 auto 40px;max-width:60ch}
.cta__body .prose{margin:0 auto 14px;color:var(--muted);font-size:17px}
.cta__btn{display:inline-flex;align-items:center;gap:12px;font-family:var(--mono);font-weight:700;
  font-size:13px;letter-spacing:.22em;padding:18px 38px;color:#03050c;
  background:linear-gradient(120deg,var(--blue),var(--cyan));
  clip-path:polygon(14px 0,100% 0,100% calc(100% - 14px),calc(100% - 14px) 100%,0 100%,0 14px);
  transition:filter .3s,transform .3s;box-shadow:0 18px 50px -18px rgba(86,216,255,.7)}
.cta__btn:hover{filter:brightness(1.12);transform:translateY(-3px)}
.cta__sign{margin:36px 0 0;font-family:var(--mono);font-size:12px;letter-spacing:.26em;color:var(--faint)}

/* ============================================================
   BOTTOM BAR
   ============================================================ */
.bottombar{position:fixed;left:0;right:0;bottom:0;z-index:55;
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:20px;
  padding:16px var(--shell-x);
  background:linear-gradient(0deg,rgba(4,6,14,.85),transparent);
  border-top:1px solid var(--line-2);
  opacity:0;transform:translateY(12px);transition:opacity .7s var(--ease) .3s,transform .7s var(--ease) .3s}
.ready .bottombar{opacity:1;transform:none}
.bottombar__left{display:flex;align-items:center;gap:16px;min-width:0}
.counter{font-family:var(--mono);font-size:13px;letter-spacing:.08em;color:var(--ink);display:flex;gap:5px}
.counter__sep,.counter__tot{color:var(--faint)}
.bottombar__label{font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;
  color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bottombar__center{display:flex;align-items:center;gap:14px;justify-self:center}
.scrollind{width:24px;height:38px;border:1px solid var(--line);border-radius:14px;
  display:flex;justify-content:center;padding-top:7px;flex:none}
.scrollind__dot{width:4px;height:7px;border-radius:3px;background:var(--cyan);animation:scrolld 1.8s var(--ease) infinite}
@keyframes scrolld{0%{transform:translateY(0);opacity:1}70%{transform:translateY(14px);opacity:0}100%{opacity:0}}
.bottombar__tag{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;color:var(--faint);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:46vw}
.bottombar__cta{justify-self:end;display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.2em;font-weight:700;color:var(--ink);
  transition:color .3s}
.bottombar__cta:hover{color:var(--cyan)}
.bottombar__arrow{transition:transform .3s}
.bottombar__cta:hover .bottombar__arrow{transform:translateX(5px)}

/* scroll progress */
.scroll-progress{position:fixed;top:0;left:0;right:0;height:2px;z-index:65;background:transparent}
.scroll-progress span{display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--blue),var(--cyan),var(--violet));box-shadow:0 0 12px rgba(86,216,255,.6)}

/* ============================================================
   MENU OVERLAY
   ============================================================ */
.menu-overlay{position:fixed;inset:0;z-index:100;background:rgba(3,5,12,.86);
  backdrop-filter:blur(18px);padding:clamp(40px,7vw,90px) var(--shell-x);
  display:flex;flex-direction:column;
  opacity:0;visibility:hidden;transition:opacity .5s var(--ease),visibility .5s}
.menu-overlay.open{opacity:1;visibility:visible}
.menu-overlay__head{display:flex;justify-content:space-between;align-items:center;
  border-bottom:1px solid var(--line);padding-bottom:24px;margin-bottom:14px}
.menu-overlay__title{font-family:var(--mono);font-size:13px;letter-spacing:.4em;color:var(--cyan)}
.menu-overlay__close{background:none;border:none;cursor:pointer;color:var(--muted);
  font-family:var(--mono);font-size:12px;letter-spacing:.24em;display:flex;align-items:center;gap:10px;
  transition:color .3s}
.menu-overlay__close span{font-size:20px}
.menu-overlay__close:hover{color:#fff}
.menu-overlay__list{flex:1;overflow-y:auto;display:grid;grid-template-columns:repeat(2,1fr);
  gap:2px;align-content:start;padding:10px 0}
.menu__item{display:flex;align-items:baseline;gap:20px;padding:16px 14px;border-bottom:1px solid var(--line-2);
  transition:background .3s,padding-left .35s var(--ease)}
.menu__item:hover{background:rgba(86,216,255,.07);padding-left:26px}
.menu__num{font-family:var(--mono);font-size:13px;color:var(--cyan);min-width:28px}
.menu__label{font-size:clamp(18px,2vw,26px);font-weight:500;color:var(--ink)}
.menu__item:hover .menu__label{color:#fff}
.menu-overlay__foot{font-family:var(--mono);font-size:11px;letter-spacing:.18em;color:var(--faint);
  border-top:1px solid var(--line);padding-top:22px;margin-top:14px}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width:1080px){
  :root{--rail-w:0px}
  .rail{display:none}
  .scene{padding-left:var(--shell-x);padding-right:var(--shell-x)}
  .scene--hero,.hero__cue{padding-left:var(--shell-x)}
  .hero__cue{left:var(--shell-x)}
}
@media (max-width:860px){
  .cards--3,.cards--model{grid-template-columns:repeat(2,1fr)}
  .anchor{grid-template-columns:1fr;gap:30px}
  .ladder{grid-template-columns:repeat(2,1fr)}
  .menu-overlay__list{grid-template-columns:1fr}
  .bottombar__tag{display:none}
}
@media (max-width:680px){
  body{font-size:16px}
  .scene{padding:120px var(--shell-x) 120px;min-height:auto}
  .scene--hero{min-height:100vh}
  .cards,.cards--3,.cards--2,.cards--quad,.cards--tile,.cards--model{grid-template-columns:1fr}
  .ladder,.callouts{grid-template-columns:1fr}
  .rowitem{grid-template-columns:42px 1fr;gap:10px 14px}
  .rowitem__desc{grid-column:2}
  .source{grid-template-columns:36px 1fr;gap:6px 12px}
  .source__desc{grid-column:2}
  .stepitem{grid-template-columns:64px 1fr;gap:16px}
  .topbar{padding:16px var(--shell-x)}
  .hbtn{padding:11px 16px;letter-spacing:.18em}
  .bottombar{grid-template-columns:auto 1fr;gap:14px}
  .bottombar__center{display:none}
  .bottombar__cta{font-size:10.5px}
  .eyebrow__org{display:none}
  .hero__cue{display:none}
}
@media (max-width:420px){
  .topbar__actions .hbtn--ghost{display:none}
}