/* =========================================================
   BIG AI LAB — Design Tokens
   ========================================================= */
:root{
  /* Void + stellar */
  --void: #0B1026;
  --void-2: #070A1A;
  --void-3: #050714;
  --stellar: #EAEEF8;
  --stellar-dim: rgba(234,238,248,0.70);
  --stellar-faint: rgba(234,238,248,0.45);
  --stellar-ghost: rgba(234,238,248,0.18);
  --stellar-line: rgba(234,238,248,0.10);

  /* Accents — plasmas */
  --cyan: #7DF9FF;
  --green: #5CFFB1;
  --amber: #FFB347;
  --magenta: #FF2E88;
  --indigo: #5B6CFF;

  /* Typography */
  --f-display: "Instrument Serif", "Cormorant Garamond", Georgia, serif;
  --f-body: "Inter Tight", "Inter", -apple-system, system-ui, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Layout */
  --max-w: 1320px;
  --gutter: clamp(20px, 4vw, 48px);

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin:0; padding:0; }
html { scroll-behavior: smooth; }
body{
  background: var(--void);
  color: var(--stellar);
  font-family: var(--f-body);
  font-size: 17px;
  line-height: 1.55;
  font-weight: 400;
  letter-spacing: -0.005em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  min-height: 100vh;
}

/* =========================================================
   Persistent starfield
   ========================================================= */
#starfield{
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(91,108,255,0.10), transparent 60%),
    radial-gradient(ellipse 70% 50% at 80% 40%, rgba(125,249,255,0.04), transparent 70%),
    linear-gradient(180deg, var(--void-2) 0%, var(--void) 40%, var(--void-3) 100%);
}
#starfield canvas{
  position:absolute; inset:0; width:100%; height:100%;
}

main { position: relative; z-index: 1; }

/* =========================================================
   Top nav
   ========================================================= */
.topnav{
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  padding: 20px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: linear-gradient(180deg, rgba(11,16,38,0.72) 0%, rgba(11,16,38,0) 100%);
  transition: background 300ms var(--ease-out);
}
.topnav.scrolled{
  background: rgba(11,16,38,0.80);
  border-bottom: 1px solid var(--stellar-line);
}
.brand{
  display: flex; align-items: center; gap: 10px;
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stellar);
}
.brand-mark{
  width: 22px; height: 22px; position: relative;
}
.brand-mark::before, .brand-mark::after{
  content:''; position: absolute; inset: 0;
  border: 1px solid var(--cyan);
  border-radius: 50%;
}
.brand-mark::after{ transform: scale(0.55); border-color: var(--green); }

.nav-links{
  display: flex; gap: 28px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.nav-links a{
  color: var(--stellar-dim);
  text-decoration: none;
  transition: color 200ms var(--ease-out);
  position: relative;
  padding: 4px 0;
}
.nav-links a:hover{ color: var(--stellar); }
.nav-links a .dot{
  display:inline-block; width:6px; height:6px; border-radius:50%;
  background: currentColor;
  margin-right: 8px; vertical-align: 1px;
  opacity: 0.6;
}

@media (max-width: 720px){
  .nav-links { display:none; }
}

/* =========================================================
   Section scaffolding
   ========================================================= */
section{
  position: relative;
  padding: clamp(80px, 12vh, 160px) var(--gutter);
  max-width: var(--max-w);
  margin: 0 auto;
}
.kicker{
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--stellar-faint);
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 28px;
}
.kicker .line{
  flex: 0 0 40px;
  height: 1px; background: var(--stellar-ghost);
}
.kicker .num{ color: var(--stellar); }

/* =========================================================
   HERO
   ========================================================= */
.hero{
  min-height: 100vh;
  max-width: none;
  padding: 0;
  display: grid;
  grid-template-rows: 1fr auto;
  overflow: hidden;
}
.hero-stage{
  position: relative;
  width: 100%;
  grid-row: 1 / 2;
  display: grid;
  place-items: center;
}
#hero-canvas{
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
}
.hero-content{
  position: relative;
  z-index: 2;
  max-width: var(--max-w);
  width: 100%;
  padding: 0 var(--gutter);
  margin-top: 40px;
}
.hero-tag{
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 28px;
  display: inline-flex; align-items: center; gap: 10px;
}
.hero-tag::before{
  content:''; width: 8px; height: 8px; border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}
.hero h1{
  font-family: var(--f-display);
  font-weight: 400;
  font-size: clamp(48px, 8vw, 112px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 44px;
  padding-bottom: 0.08em;
  max-width: 16ch;
  color: var(--stellar);
  font-style: normal;
}
.hero h1 em{
  font-style: italic;
  color: var(--cyan);
  font-weight: 400;
}
.hero-sub{
  font-size: clamp(18px, 1.6vw, 22px);
  line-height: 1.45;
  max-width: 54ch;
  color: var(--stellar-dim);
  margin: 0 0 40px;
  letter-spacing: -0.01em;
}
.hero-ctas{
  display: flex; gap: 20px; flex-wrap: wrap;
}
.cta{
  display: inline-flex; align-items: center; gap: 12px;
  padding: 14px 22px;
  border: 1px solid var(--stellar-ghost);
  color: var(--stellar);
  text-decoration: none;
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: rgba(234,238,248,0.03);
  transition: all 300ms var(--ease-out);
  position: relative;
  overflow: hidden;
}
.cta:hover{
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(125,249,255,0.06);
}
.cta .arrow{ transition: transform 300ms var(--ease-out); }
.cta:hover .arrow{ transform: translateX(4px); }
.cta.ghost{ background: transparent; }

.hero-meta{
  grid-row: 2;
  padding: 28px var(--gutter);
  border-top: 1px solid var(--stellar-line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stellar-faint);
  gap: 20px;
  flex-wrap: wrap;
}
.hero-meta > div { display: flex; align-items: center; gap: 10px; }
.hero-meta .sep { color: var(--stellar-ghost); }
.hero-meta strong { color: var(--stellar); font-weight: 400; }

/* Scroll hint */
.scroll-hint{
  position: absolute;
  bottom: 100px; right: var(--gutter);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--stellar-faint);
  writing-mode: vertical-rl;
  display: flex; align-items: center; gap: 16px;
  z-index: 3;
}
.scroll-hint::before{
  content:''; width: 1px; height: 60px;
  background: linear-gradient(180deg, transparent, var(--stellar-ghost));
  animation: scrollDown 2.4s ease-in-out infinite;
}
@keyframes scrollDown{
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

@media (max-width: 720px){
  .scroll-hint { display: none; }
  .hero-meta { font-size: 10px; }
}

/* =========================================================
   WHAT WE DO — the three-line method
   ========================================================= */
.method h2{
  font-family: var(--f-display);
  font-weight: 400;
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 0 0 80px;
  max-width: 20ch;
  color: var(--stellar);
}
.method-lines{
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--stellar-line);
}
.method-line{
  display: grid;
  grid-template-columns: 120px 1fr 2fr;
  gap: 40px;
  align-items: baseline;
  padding: 36px 0;
  border-bottom: 1px solid var(--stellar-line);
  position: relative;
}
.method-line::before{
  content:''; position: absolute; left: 0; top: 0;
  width: 0; height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
  transition: width 1200ms var(--ease-out);
}
.method-line.in-view::before{ width: 100%; }
.method-num{
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--stellar-faint);
}
.method-title{
  font-family: var(--f-display);
  font-size: clamp(28px, 3vw, 40px);
  font-weight: 400;
  line-height: 1.15;
  color: var(--stellar);
  padding-bottom: 0.06em;
}
.method-title em{ font-style: italic; color: var(--cyan); }
.method-body{
  color: var(--stellar-dim);
  font-size: 17px;
  line-height: 1.55;
  max-width: 60ch;
}

@media (max-width: 820px){
  .method-line{
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 28px 0;
  }
}

/* =========================================================
   Project cards
   ========================================================= */
.rail-header{
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 24px;
  margin-bottom: 48px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--stellar-line);
}
.rail-header h2{
  font-family: var(--f-display);
  font-weight: 400;
  font-size: clamp(28px, 3vw, 42px);
  line-height: 1.12;
  margin: 0;
  color: var(--stellar);
  letter-spacing: -0.01em;
  padding-bottom: 0.05em;
}
.rail-header .rail-meta{
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--stellar-faint);
}

.rail{ margin-bottom: 40px; }

.cards{
  display: grid;
  gap: 32px;
}
.cards.cards-active{ grid-template-columns: 1fr; }
.cards.cards-research{ grid-template-columns: 1fr 1fr; }
.cards.cards-exploring{ grid-template-columns: 1fr 1fr; }

@media (max-width: 960px){
  .cards.cards-research,
  .cards.cards-exploring { grid-template-columns: 1fr; }
}

.card{
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: stretch;
  padding: 40px;
  border: 1px solid var(--stellar-ghost);
  background:
    linear-gradient(180deg, rgba(234,238,248,0.02) 0%, rgba(234,238,248,0.005) 100%);
  transition: border-color 400ms var(--ease-out), transform 400ms var(--ease-out), background 400ms var(--ease-out);
  overflow: hidden;
  isolation: isolate;
}
.card::before{
  content:''; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse 60% 70% at 85% 50%, var(--accent-faint, transparent), transparent 60%);
  opacity: 0;
  transition: opacity 600ms var(--ease-out);
  z-index: -1;
}
.card:hover::before{ opacity: 1; }
.card:hover{
  border-color: var(--accent, var(--stellar-ghost));
  transform: translateY(-2px);
}
.card[data-accent="green"]{ --accent: var(--green); --accent-faint: rgba(92,255,177,0.08); }
.card[data-accent="cyan"]{ --accent: var(--cyan); --accent-faint: rgba(125,249,255,0.08); }
.card[data-accent="amber"]{ --accent: var(--amber); --accent-faint: rgba(255,179,71,0.07); }
.card[data-accent="magenta"]{ --accent: var(--magenta); --accent-faint: rgba(255,46,136,0.07); }

.card-body{ display: flex; flex-direction: column; min-width: 0; }
.card-tag{
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent, var(--stellar));
  margin-bottom: 24px;
  display: flex; align-items: center; gap: 10px;
}
.card-tag::before{
  content:''; width: 7px; height: 7px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent);
}
.card[data-status="research"] .card-tag::before{
  background: transparent; border: 1px solid var(--accent);
  box-shadow: none;
}
.card[data-status="exploring"] .card-tag::before{
  background: transparent; border: 1px dashed var(--accent);
  box-shadow: none;
}

.card-headline{
  font-family: var(--f-display);
  font-weight: 400;
  font-size: clamp(26px, 3vw, 42px);
  line-height: 1.15;
  letter-spacing: -0.015em;
  color: var(--stellar);
  margin: 0 0 24px;
  padding-bottom: 0.06em;
}
.card-small .card-headline{ font-size: clamp(22px, 2.4vw, 32px); }
.card-headline em{ font-style: italic; color: var(--accent); }

.card-copy{
  color: var(--stellar-dim);
  font-size: 16px;
  line-height: 1.55;
  margin: 0 0 28px;
  max-width: 56ch;
}
.card-meta{
  margin-top: auto;
  padding-top: 24px;
  border-top: 1px solid var(--stellar-line);
  display: flex; flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}
.card-meta .sep { color: var(--stellar-ghost); }
.card-meta .dim { color: var(--stellar-faint); }

.card-foot{
  display: flex; justify-content: space-between; align-items: end;
  gap: 20px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid var(--stellar-line);
}
.card-link{
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--stellar);
  text-decoration: none;
  display: inline-flex; align-items: center; gap: 10px;
  border-bottom: 1px solid var(--stellar-ghost);
  padding-bottom: 4px;
  transition: color 200ms, border-color 200ms;
}
.card-link:hover{ color: var(--accent); border-color: var(--accent); }
.card-link.disabled{
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
  color: var(--stellar);
  border-bottom-color: var(--stellar-ghost);
}
.card-link-wrap{ display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }
.card-link-note{
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--stellar-ghost);
}

/* Motif container */
.motif{
  position: relative;
  align-self: stretch;
  display: grid;
  place-items: center;
  width: 280px;
}
.card-small .motif{ width: 220px; }
.card[data-motif="column"] .motif{ width: 180px; }
.motif canvas{ display: block; }
.motif-label{
  position: absolute;
  bottom: 0; left: 0;
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--stellar-faint);
  padding: 6px 10px;
  border-left: 1px solid var(--accent);
  background: rgba(11,16,38,0.6);
  pointer-events: none;
}

@media (max-width: 820px){
  .card{
    grid-template-columns: 1fr;
    padding: 28px;
    gap: 28px;
  }
  .motif{ width: 100%; max-width: 280px; justify-self: start; }
  .card-small .motif{ width: 100%; max-width: 240px; }
}

/* =========================================================
   Manifesto / Method section
   ========================================================= */
.manifesto{
  max-width: var(--max-w);
  margin: 0 auto;
}
.manifesto-body{
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 60px;
  align-items: start;
}
.manifesto p{
  font-family: var(--f-display);
  font-weight: 400;
  font-size: clamp(22px, 2.2vw, 30px);
  line-height: 1.3;
  margin: 0 0 24px;
  color: var(--stellar);
  letter-spacing: -0.01em;
  text-wrap: pretty;
}
.manifesto p:last-child{ margin-bottom: 0; }
.manifesto p em{ font-style: italic; color: var(--cyan); }
.manifesto-foot{
  margin-top: 60px;
  padding-top: 24px;
  border-top: 1px solid var(--stellar-line);
  display: flex; gap: 40px;
  font-family: var(--f-mono);
  font-size: 13px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--stellar-faint);
  flex-wrap: wrap;
}
.manifesto-foot a{
  color: var(--stellar-dim);
  text-decoration: none;
  display: inline-flex; align-items: center; gap: 8px;
  transition: color 200ms;
}
.manifesto-foot a:hover{ color: var(--stellar); }
.manifesto-foot a::before{
  content:''; width: 6px; height: 6px; border-radius: 50%;
  background: var(--stellar-ghost);
}
.manifesto-foot a:nth-child(1)::before{ background: var(--cyan); }
.manifesto-foot a:nth-child(2)::before{ background: var(--green); }
.manifesto-foot a:nth-child(3)::before{ background: var(--amber); }

@media (max-width: 820px){
  .manifesto-body{ grid-template-columns: 1fr; gap: 20px; }
}

/* =========================================================
   Footer / contact
   ========================================================= */
.foot{
  padding-top: 120px;
  padding-bottom: 60px;
  border-top: 1px solid var(--stellar-line);
  margin-top: 60px;
}
.foot-hero{
  font-family: var(--f-display);
  font-weight: 400;
  font-size: clamp(32px, 5vw, 72px);
  line-height: 1.15;
  letter-spacing: -0.015em;
  margin: 0 0 40px;
  padding-bottom: 0.06em;
  color: var(--stellar);
  max-width: 20ch;
}
.foot-email{
  font-family: var(--f-mono);
  font-size: clamp(18px, 2vw, 28px);
  letter-spacing: 0.05em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--cyan);
  padding-bottom: 6px;
  display: inline-block;
  transition: color 200ms;
}
.foot-email:hover{ color: var(--stellar); border-color: var(--stellar); }
.foot-legal{
  margin-top: 80px;
  padding-top: 24px;
  border-top: 1px solid var(--stellar-line);
  display: flex; justify-content: space-between;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--stellar-faint);
  flex-wrap: wrap; gap: 12px;
}

/* =========================================================
   Scroll reveal
   ========================================================= */
.reveal{
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 900ms var(--ease-out), transform 900ms var(--ease-out);
}
.reveal.in-view{ opacity: 1; transform: none; }
.reveal.delay-1{ transition-delay: 100ms; }
.reveal.delay-2{ transition-delay: 200ms; }
.reveal.delay-3{ transition-delay: 300ms; }

/* =========================================================
   Tweaks panel
   ========================================================= */
.tweaks{
  position: fixed;
  right: 20px; bottom: 20px;
  z-index: 100;
  width: 280px;
  background: rgba(7,10,26,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--stellar-ghost);
  padding: 18px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--stellar-dim);
  display: none;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6);
}
.tweaks.active{ display: block; }
.tweaks h4{
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--stellar);
  display: flex; justify-content: space-between; align-items: center;
}
.tweaks h4::after{
  content:'●'; color: var(--cyan); font-size: 10px;
}
.tweak-row{
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 0;
  border-top: 1px solid var(--stellar-line);
}
.tweak-row label{ color: var(--stellar-dim); }
.tweak-row input[type="range"]{
  width: 100px; accent-color: var(--cyan);
}
.tweak-row .toggle{
  width: 36px; height: 18px; border-radius: 18px;
  background: var(--stellar-ghost); border: 1px solid var(--stellar-line);
  position: relative; cursor: pointer;
  transition: background 200ms;
}
.tweak-row .toggle::after{
  content:''; position: absolute;
  top: 1px; left: 1px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--stellar-dim);
  transition: transform 200ms, background 200ms;
}
.tweak-row .toggle.on{ background: rgba(125,249,255,0.2); border-color: var(--cyan); }
.tweak-row .toggle.on::after{ transform: translateX(18px); background: var(--cyan); }

@media (max-width: 720px){
  .tweaks{ right: 12px; bottom: 12px; width: calc(100vw - 24px); max-width: 300px; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}