/* Starr Quant Lab site — shared foundation. Dark only. Content is visible by default; GSAP sets
   from-states inside matchMedia, never here. */

:root {
  --void: #030712;
  --void-rgb: 3, 7, 18; /* for rgba(var(--void-rgb), a) */
  --moon: #F2F2F7;
  --moon-dim: #D4D4E0;
  --haze: #8A8FAC;
  --dust: #5A5F82;
  --green: #5EEAD4;
  --violet: #A78BFA;
  --pink: #F9A8D4;
  --gold: #FCD34D;
  --border: rgba(242, 242, 247, .07);
  --border-hi: rgba(242, 242, 247, .18);
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --sans: 'Geist', ui-sans-serif, system-ui, -apple-system, 'PingFang SC', 'Hiragino Sans GB', sans-serif;
  --mono: 'Geist Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --gutter: clamp(16px, 4vw, 56px);
  --maxw: 1320px;
  --nav-h: 64px;
  --fade-top: 110px;
  --fade-bottom: 64px;
  color-scheme: dark;
}

/* ---------------------------------------------------------------- reset */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--void);
  color: var(--moon-dim);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 300;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}
h1, h2, h3, h4, p, figure, blockquote, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
::selection { background: rgba(94, 234, 212, .28); color: var(--moon); }
:focus-visible { outline: 1px solid var(--green); outline-offset: 3px; }

/* ---------------------------------------------------------------- stage layers */
.stage-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  height: 100lvh;
  z-index: 0;
  pointer-events: none;
  background: var(--void);
}
.stage-vignette {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(120% 90% at 50% 45%, transparent 45%, rgba(3, 7, 18, .55) 80%, rgba(3, 7, 18, .92) 100%),
    linear-gradient(to bottom, rgba(3, 7, 18, .6) 0, transparent 18%, transparent 78%, rgba(3, 7, 18, .7) 100%);
}
.content { position: relative; z-index: 10; overflow-x: clip; } /* section scrims (::before insets) must never widen the page */

/* ---------------------------------------------------------------- nav */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--nav-h);
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  /* no backdrop-filter over WebGL: a soft gradient keeps it legible and cheap */
  background: linear-gradient(to bottom, rgba(3, 7, 18, .88), rgba(3, 7, 18, .5) 60%, transparent);
  will-change: transform; /* story.js auto-hides it (yPercent -100) when scrolling down past 1 viewport */
}

/* ---------------------------------------------------------------- edge fade (inserted by initStory)
   Between content (z 10) and nav (z 50): copy passing under the top edge fades out instead of
   colliding with the nav; a softer bottom fade keeps copy off the bottom HUD. */
.edge-fade {
  position: fixed; inset: 0; z-index: 30; pointer-events: none;
}
.edge-fade::before, .edge-fade::after { content: ''; position: absolute; left: 0; right: 0; }
.edge-fade::before {
  top: 0; height: var(--fade-top);
  background: linear-gradient(to bottom, var(--void) 0, rgba(var(--void-rgb), .9) 30%, rgba(var(--void-rgb), .55) 62%, rgba(var(--void-rgb), .2) 85%, transparent);
}
.edge-fade::after {
  bottom: 0; height: var(--fade-bottom);
  background: linear-gradient(to top, rgba(var(--void-rgb), .85) 0, rgba(var(--void-rgb), .45) 50%, transparent);
}
.nav-brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 12px; font-weight: 500;
  letter-spacing: .18em; text-transform: uppercase; color: var(--moon);
}
.nav-brand img { width: 22px; height: 22px; }
.nav-links { display: flex; gap: 28px; }
.nav-links a {
  font-family: var(--mono); font-size: 11px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--haze); transition: color .4s var(--ease);
}
.nav-links a:hover { color: var(--moon); }

/* ---------------------------------------------------------------- nav dropdown */
.nav-brand img { border-radius: 4px; }
.nav-right { display: flex; align-items: center; gap: 32px; }
.nav-menu { position: relative; }
.nav-menu summary {
  list-style: none; cursor: pointer;
  font-family: var(--mono); font-size: 11px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--moon); padding: 8px 14px; border: 1px solid var(--border-hi); border-radius: 999px;
  transition: border-color .4s var(--ease);
}
.nav-menu summary::-webkit-details-marker { display: none; }
.nav-menu summary span { color: var(--haze); margin-left: 4px; }
.nav-menu summary:hover, .nav-menu[open] summary { border-color: rgba(94, 234, 212, .5); }
.nav-menu-panel {
  position: absolute; right: 0; top: calc(100% + 10px); width: 280px; padding: 6px;
  background: rgba(3, 7, 18, .96); border: 1px solid var(--border-hi); border-radius: 6px;
}
.nav-menu-panel a { display: block; padding: 12px 14px; border-radius: 4px; transition: background .4s var(--ease); }
.nav-menu-panel a:hover { background: rgba(242, 242, 247, .05); }
.nav-menu-panel strong { display: block; font-weight: 400; color: var(--moon); font-size: 15px; }
.nav-menu-panel span { display: block; margin-top: 4px; font-size: 13px; color: var(--haze); line-height: 1.4; }
.footer-tg:hover { color: var(--green); }
@media (max-width: 900px) {
  .nav-right { gap: 12px; }
  .nav-menu summary { padding: 7px 12px; font-size: 10px; }
  .nav-menu-panel { width: min(280px, calc(100vw - 32px)); }
}

/* ---------------------------------------------------------------- typography */
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 11px; font-weight: 400;
  letter-spacing: .16em; text-transform: uppercase; color: var(--haze);
}
.eyebrow::before { content: ''; width: 18px; height: 1px; background: currentColor; opacity: .6; }
.eyebrow.accent { color: var(--green); }

.hero-title, h1 {
  font-size: clamp(56px, 9vw, 148px);
  font-weight: 200;
  line-height: .96;
  letter-spacing: -.045em;
  color: var(--moon);
  text-wrap: pretty;
}
h2, .h2 {
  font-size: clamp(40px, 5.5vw, 88px);
  font-weight: 250;
  line-height: 1.02;
  letter-spacing: -.035em;
  color: var(--moon);
}
h3, .h3 {
  font-size: clamp(20px, 1.8vw, 26px);
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: -.01em;
  color: var(--moon);
}
.lede {
  max-width: 38ch;
  font-size: clamp(17px, 1.45vw, 21px);
  line-height: 1.55;
  color: var(--haze);
}
.mono { font-family: var(--mono); }
.hud {
  font-family: var(--mono); font-size: 11px; line-height: 1.5;
  letter-spacing: .12em; text-transform: uppercase; color: var(--dust);
}
.text-green { color: var(--green); } .text-violet { color: var(--violet); }
.text-pink { color: var(--pink); } .text-gold { color: var(--gold); }
.grad-text {
  background: linear-gradient(100deg, var(--moon) 20%, var(--green) 55%, var(--violet) 90%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
/* SplitText mask wrappers must not clip descenders */
.split-line { padding-bottom: .06em; margin-bottom: -.06em; }

/* ---------------------------------------------------------------- chapters */
.chapter {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  padding: calc(var(--nav-h) + 8vh) var(--gutter) 12vh;
  display: flex;
  align-items: center;
}
.chapter.is-top { align-items: flex-start; }
.chapter.is-end { align-items: flex-end; }
.chapter-inner { width: 100%; max-width: var(--maxw); margin: 0 auto; }
/* keep chapter copy above positioned section scrims (::before overlays). z-index works on flex items
   without position, so absolutely positioned descendants keep the section as containing block. */
.chapter > .chapter-inner { z-index: 1; }
.chapter-inner.narrow { max-width: 880px; }
.chapter-inner.center { text-align: center; }
.chapter-inner.center .lede { margin-left: auto; margin-right: auto; }
.stack > * + * { margin-top: 28px; }
.stack-lg > * + * { margin-top: 48px; }
.chapter-index {
  position: absolute; top: calc(var(--nav-h) + 24px); right: var(--gutter);
  font-family: var(--mono); font-size: 11px; letter-spacing: .16em; color: var(--dust);
}

/* ---------------------------------------------------------------- HUD panel */
.hud-panel {
  position: relative;
  padding: 28px;
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(3, 7, 18, .72), rgba(3, 7, 18, .45));
}
.hud-panel::before {
  content: '';
  position: absolute; inset: 0;
  padding: 1px;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--border-hi), var(--border) 40%, var(--border) 60%, rgba(94, 234, 212, .22));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box exclude, linear-gradient(#000 0 0);
  pointer-events: none;
}

/* ---------------------------------------------------------------- stats */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--border);
}
.stat { padding: 28px 24px 8px 0; }
.stat + .stat { padding-left: 24px; border-left: 1px solid var(--border); }
.stat-value {
  display: block;
  font-size: clamp(40px, 4.6vw, 72px);
  font-weight: 200;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--moon);
  font-variant-numeric: tabular-nums;
}
.stat-label { display: block; margin-top: 14px; }

/* ---------------------------------------------------------------- services */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.service {
  padding: 36px 32px 40px;
  background: rgba(3, 7, 18, .82);
  transition: background .6s var(--ease);
}
.service:hover { background: rgba(10, 16, 34, .9); }
.service .hud { display: block; margin-bottom: 40px; }
.service p { margin-top: 12px; color: var(--haze); font-size: 15px; }

/* ---------------------------------------------------------------- exchanges */
.exchange-list {
  display: flex; flex-wrap: wrap;
  border-top: 1px solid var(--border);
}
.exchange-list li {
  flex: 1 1 180px;
  padding: 22px 20px 22px 0;
  border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: baseline; gap: 12px;
  font-size: clamp(20px, 2vw, 28px); font-weight: 300; letter-spacing: -.02em; color: var(--moon);
}
.exchange-list li .hud { font-size: 10px; }

/* ---------------------------------------------------------------- quote */
.quote {
  max-width: 22ch;
  font-size: clamp(32px, 4.2vw, 64px);
  font-weight: 200;
  line-height: 1.12;
  letter-spacing: -.03em;
  color: var(--moon);
}
.quote cite { display: block; margin-top: 28px; font-style: normal; }

/* ---------------------------------------------------------------- CTA + buttons */
.cta { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; }
.btn {
  display: inline-flex; align-items: center; gap: 12px;
  height: 48px; padding: 0 22px;
  font-family: var(--mono); font-size: 12px; font-weight: 500;
  letter-spacing: .14em; text-transform: uppercase;
  color: var(--void); background: var(--moon);
  border: 1px solid var(--moon); border-radius: 999px;
  transition: background .5s var(--ease), color .5s var(--ease), border-color .5s var(--ease), transform .5s var(--ease);
}
.btn:hover { background: var(--green); border-color: var(--green); transform: translateY(-1px); }
.btn.ghost { color: var(--moon); background: transparent; border-color: var(--border-hi); }
.btn.ghost:hover { color: var(--void); background: var(--moon); border-color: var(--moon); }
.btn .arrow { transition: transform .5s var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }

/* ---------------------------------------------------------------- footer */
.footer {
  position: relative; z-index: 10;
  padding: 48px var(--gutter) 88px;
  border-top: 1px solid var(--border);
  background: linear-gradient(to bottom, rgba(3, 7, 18, .6), var(--void));
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px;
}

/* ---------------------------------------------------------------- legibility scrims (opt-in utilities)
   .scrim-left    desktop only: left-column gradient on a full-width section/panel behind left-aligned copy
   .scrim-radial  soft radial pool behind a centred text block (pseudo-element; host gets isolation)
   .scrim-mobile  ≤900px only: vertical band behind a text block (transparent at its top/bottom edges) */
@media (min-width: 901px) {
  .scrim-left {
    background-image: linear-gradient(to right, rgba(var(--void-rgb), .78) 0, rgba(var(--void-rgb), .6) 28%, rgba(var(--void-rgb), .25) 50%, transparent 66%);
  }
}
.scrim-radial { position: relative; isolation: isolate; }
.scrim-radial::before {
  content: ''; position: absolute; inset: -18% -14%; z-index: -1; pointer-events: none;
  background: radial-gradient(closest-side, rgba(var(--void-rgb), .72), rgba(var(--void-rgb), .45) 55%, transparent);
}
@media (max-width: 900px) {
  .scrim-mobile { position: relative; isolation: isolate; }
  .scrim-mobile::before {
    content: ''; position: absolute; inset: -48px calc(-1 * var(--gutter)); z-index: -1; pointer-events: none;
    background: linear-gradient(to bottom, transparent 0, rgba(var(--void-rgb), .66) 48px, rgba(var(--void-rgb), .66) calc(100% - 48px), transparent 100%);
  }
}

/* ---------------------------------------------------------------- responsive */
@media (max-width: 900px) {
  :root { --nav-h: 56px; --fade-top: 84px; }
  .nav-links { display: none; }
  .stat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat:nth-child(odd) { padding-left: 0; border-left: 0; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--border); }
  .service-grid { grid-template-columns: 1fr; }
  .chapter { padding-top: calc(var(--nav-h) + 6vh); padding-bottom: 10vh; }
  .hud-panel { padding: 22px; }
}
@media (max-width: 600px) {
  .hero-title, h1 { font-size: clamp(44px, 13vw, 64px); letter-spacing: -.04em; }
  h2, .h2 { font-size: clamp(34px, 10vw, 48px); }
  .stat { padding: 22px 12px 6px 0; }
  .stat + .stat { padding-left: 12px; }
  .stat:nth-child(odd) { padding-left: 0; }
  .service { padding: 28px 22px 30px; }
  .exchange-list li { flex-basis: 100%; }
  .chapter-index { display: none; }
  .footer { padding-bottom: 72px; }
}

/* ---------------------------------------------------------------- reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}