/* Scroll studies. Motion is opt-in via html.is-motion so the page
   stays readable with no JavaScript and under reduced motion. */
@property --p {
  syntax: "<number>";
  inherits: true;
  initial-value: 0;
}

:root {
  --bg: #09090f;
  --gold: #d4a843;
  --light: #e8c96a;
  --text: #f2f0ea;
  --muted: #a29fae;
  --line: rgba(212, 168, 67, 0.22);
  --font: "Inter", system-ui, sans-serif;
  --serif: "Cormorant Garamond", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
button { font: inherit; }
:focus-visible { outline: 2px solid var(--light); outline-offset: 3px; }
::selection { background: rgba(232, 201, 106, 0.85); color: #14110c; }

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 20;
  background: var(--light);
  color: #14110c;
  padding: 0.55rem 0.9rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}
.skip:focus { top: 1rem; }

.mast {
  display: grid;
  gap: 1.25rem;
  padding: clamp(1.25rem, 3vw, 2rem) clamp(1.25rem, 4vw, 3.5rem) 1.5rem;
  border-bottom: 1px solid var(--line);
}
.mast-row, .study-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.8rem 1.4rem;
}
.mark {
  font-family: var(--mono);
  letter-spacing: 0.16em;
  font-size: 0.78rem;
  text-decoration: none;
  color: var(--text);
}
.mark span { color: var(--gold); }
.mast-back {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--light);
  text-decoration: none;
}
h1 {
  margin: 0;
  font-family: var(--font);
  font-weight: 300;
  font-size: clamp(2.4rem, 6vw, 4.6rem);
  letter-spacing: -0.045em;
  line-height: 0.96;
}
h1 em, h2 em {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  color: var(--light);
}
.mast p {
  margin: 0.4rem 0 0;
  max-width: 42rem;
  color: var(--muted);
}
.study-nav a {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
}
.study-nav a:hover { color: var(--light); }

.study {
  --p: 0;
  position: relative;
  background: var(--bg);
}
.stage {
  position: relative;
  min-height: 100svh;
  overflow: hidden;
  background: var(--bg);
  display: grid;
}
html.is-motion .study { height: var(--span, 220vh); }
html.is-motion .stage {
  position: sticky;
  top: 0;
  height: 100svh;
  min-height: 0;
}

.plate, .plate img, .plate video, .plate canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.plate img, .plate video {
  object-fit: contain;
  object-position: center 58%;
}
.plate video { opacity: 0; }
html.is-motion .plate.is-live video { opacity: 1; }
.plate canvas { display: block; }
html.is-motion .poster { opacity: 1; }
html.is-motion .is-live > .poster,
html.is-motion .plate.is-live .poster { opacity: 0; }

.veil {
  position: absolute;
  pointer-events: none;
  z-index: 2;
}
.copy {
  position: relative;
  z-index: 3;
  align-self: end;
  max-width: 36rem;
  padding: clamp(1.5rem, 4vw, 3.2rem);
}
.copy h2 {
  margin: 0 0 0.6rem;
  font-weight: 300;
  font-size: clamp(2rem, 4.4vw, 4rem);
  letter-spacing: -0.045em;
  line-height: 1.02;
  text-wrap: balance;
}
.copy p { margin: 0; color: #d5d0dc; max-width: 36ch; }
.kicker {
  margin: 0 0 0.7rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}

/* Inquiry: three planes, text on the left */
.study-inquiry .copy { align-self: center; max-width: 28rem; }
.study-inquiry .veil {
  inset: 0 auto 0 0;
  width: min(46vw, 36rem);
  background: linear-gradient(90deg, rgba(9, 9, 15, 0.88), rgba(9, 9, 15, 0.2) 80%, transparent);
}
.planes { position: absolute; inset: 0; }
.planes .plane {
  position: absolute;
  left: 50%;
  top: 54%;
  width: min(980px, 92vw);
  max-width: none;
  height: auto;
  translate: -50% -50%;
}
html.is-motion .planes .back {
  width: min(1180px, 120vw);
  filter: blur(8px) brightness(0.5);
  translate: -50% calc(-50% + (var(--p) - 0.5) * -72px);
}
html.is-motion .planes .mid {
  translate: -50% calc(-50% + (var(--p) - 0.5) * -26px);
}
html.is-motion .planes .glow {
  mix-blend-mode: screen;
  opacity: calc(var(--p) * 0.72);
  translate: -50% calc(-50% + (var(--p) - 0.5) * -40px);
}
.planes .glow { opacity: 0; }
.orbit {
  position: absolute;
  left: 50%;
  top: 46%;
  width: min(640px, 70vw);
  height: auto;
  translate: -50% -50%;
  pointer-events: none;
}
html.is-motion .orbit {
  translate: -50% calc(-50% + (var(--p) - 0.5) * 36px);
  rotate: calc(var(--p) * 28deg);
}

/* Library */
.study-library .copy { align-self: end; }
.study-library .veil {
  inset: auto 0 0 0;
  height: 48%;
  background: linear-gradient(180deg, transparent, rgba(9, 9, 15, 0.9));
}
.study-library .late { opacity: 1; }
html.is-motion .study-library .late { opacity: var(--p); }
.mask { display: block; overflow: hidden; padding-bottom: 0.08em; }
html.is-motion .line {
  --enter: clamp(0, (var(--p) - var(--a, 0)) / 0.14, 1);
  opacity: var(--enter);
  translate: 0 calc((1 - var(--enter)) * 18px);
}

.cue { margin-top: 0.35rem; }
html.is-motion .cue {
  --enter: clamp(0, (var(--p) - var(--a, 0)) / 0.12, 1);
  --leave: clamp(0, (var(--b, 1.2) - var(--p)) / 0.12, 1);
  opacity: min(var(--enter), var(--leave));
  translate: 0 calc((1 - var(--enter)) * 12px);
}

/* Vault: copy on the right, the long hold */
.study-vault .copy { justify-self: end; align-self: end; text-align: right; }
.study-vault .copy p { margin-left: auto; }
.study-vault .veil {
  inset: auto 0 0 0;
  height: 46%;
  background: linear-gradient(180deg, transparent, rgba(9, 9, 15, 0.82));
}

/* Search iris */
.study-search .copy { align-self: start; padding-top: clamp(4.5rem, 12vh, 7rem); }
.study-search .veil {
  inset: 0 auto auto 0;
  width: min(42vw, 34rem);
  height: 46%;
  background: linear-gradient(180deg, rgba(9, 9, 15, 0.78), transparent);
}
html.is-motion .iris {
  clip-path: circle(calc(var(--p) * 78%) at 58% 52%);
}

/* Pan */
.study-forms .stage { display: block; }
.rail-clip {
  height: 100%;
  min-height: 100svh;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  display: grid;
  align-items: center;
}
html.is-motion .rail-clip { overflow: hidden; scroll-snap-type: none; }
.rail {
  display: flex;
  gap: clamp(0.8rem, 1.6vw, 1.3rem);
  width: max-content;
  padding: 0 clamp(1.25rem, 4vw, 3.5rem);
}
html.is-motion .rail { translate: calc(var(--p) * var(--travel, 0) * -1px) 0; }
.card {
  scroll-snap-align: start;
  flex: none;
  width: clamp(16rem, 32vw, 26rem);
  min-height: 28rem;
  padding: 0.85rem 0.85rem 1.15rem;
  background: #100f16;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 2px;
}
.card-title {
  width: clamp(20rem, 46vw, 36rem);
  display: grid;
  align-content: end;
  background: transparent;
  border: 0;
  padding: 0 1rem 0 0;
}
.card h2, .card h3 {
  margin: 0.85rem 0 0.35rem;
  font-weight: 300;
  letter-spacing: -0.03em;
}
.card h2 { font-size: clamp(2.2rem, 4vw, 3.6rem); }
.card h3 { font-size: 1.35rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.card img { width: 100%; height: 15rem; object-fit: cover; object-position: center 40%; background: #09090f; }
.card-inner { transform: rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg)); transform-style: preserve-3d; }
html.is-motion .card:not(.card-title) {
  opacity: clamp(0.55, (var(--p) * 1.15 - var(--i, 0)) / 0.22, 1);
}

/* Apollo */
.study-apollo .copy { align-self: start; padding-top: clamp(4rem, 10vh, 6rem); }
.study-apollo .veil {
  inset: 0 0 auto 0;
  height: 38%;
  background: linear-gradient(180deg, rgba(9, 9, 15, 0.72), transparent);
}
.plate canvas { background: transparent; }

/* Agent */
.study-agent .stage { cursor: crosshair; }
.study-agent .copy { align-self: end; }
.study-agent .veil {
  inset: auto 0 0 0;
  height: 42%;
  background: linear-gradient(180deg, transparent, rgba(9, 9, 15, 0.88));
}
.spot {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background: radial-gradient(circle at var(--mx, 50%) var(--my, 46%), rgba(232, 201, 106, 0.22), transparent 28%);
  opacity: 0;
}
html.is-motion .spot { opacity: 1; }
.agent-orbit {
  position: absolute;
  left: 50%;
  top: 42%;
  width: min(520px, 70vw);
  z-index: 2;
  pointer-events: none;
  transform: translate(-50%, -50%);
}
html.is-motion .agent-orbit { rotate: calc(var(--p) * 240deg); }

/* Codex close holds */
.study-codex .copy { align-self: end; }
.study-codex .veil {
  inset: auto 0 0 0;
  height: 42%;
  background: linear-gradient(180deg, transparent, rgba(9, 9, 15, 0.9));
}

@media (max-width: 720px) {
  html.is-motion .study { height: calc(var(--span, 220vh) * 0.72); }
  .copy, .study-vault .copy, .study-inquiry .copy, .study-search .copy, .study-apollo .copy {
    align-self: end;
    justify-self: start;
    text-align: left;
    max-width: none;
    padding: 1.2rem 1.15rem 1.5rem;
  }
  .study-vault .copy p { margin-left: 0; }
  .study-inquiry .veil,
  .study-search .veil,
  .study-apollo .veil,
  .study-library .veil,
  .study-vault .veil,
  .study-agent .veil,
  .study-codex .veil {
    inset: auto 0 0 0;
    width: auto;
    height: 52%;
    background: linear-gradient(180deg, transparent, rgba(9, 9, 15, 0.92));
  }
  .card { width: 78vw; min-height: 0; }
  .card-title { width: 78vw; }
  .card img { height: 11.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  html.is-motion .line,
  html.is-motion .cue,
  html.is-motion .rail,
  html.is-motion .orbit,
  html.is-motion .agent-orbit,
  html.is-motion .planes .plane {
    translate: none;
    rotate: none;
    opacity: 1;
  }
}

@media (scripting: none) {
  .late, .iris, .glow { opacity: 1; }
  .iris { clip-path: none; }
}