/* =================================================================
   BRAIN LAB 101 — design system
   Dark, bioluminescent, neural. Built from scratch, zero-build.
   ================================================================= */

:root {
  /* — palette — */
  --bg:        #060709;
  --bg-elev:   #0b0e14;
  --bg-card:   rgba(255, 255, 255, 0.022);
  --ink:       #f3f6fc;
  --ink-dim:   #9aa6bd;
  --ink-faint: #59647b;
  --line:      rgba(255, 255, 255, 0.09);
  --line-soft: rgba(255, 255, 255, 0.05);

  --cyan:   #2de2e6;
  --violet: #7c5cff;
  --pink:   #ff4d8d;
  --grad:   linear-gradient(120deg, var(--violet), var(--cyan));
  --grad-text: linear-gradient(120deg, #b6a6ff 0%, #6ef0ec 60%, #2de2e6 100%);

  --glow-cyan:   0 0 40px rgba(45, 226, 230, 0.35);
  --glow-violet: 0 0 40px rgba(124, 92, 255, 0.35);

  /* — type — */
  --font-display: "Space Grotesk", "Segoe UI", system-ui, sans-serif;
  --font-body:    "Inter", system-ui, -apple-system, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SFMono-Regular", monospace;

  /* — layout — */
  --maxw: 1240px;
  --pad:  clamp(1.25rem, 5vw, 4rem);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* Hide native cursor only when our custom one is active */
body.has-cursor,
body.has-cursor a,
body.has-cursor button { cursor: none; }

::selection { background: rgba(124, 92, 255, 0.4); color: #fff; }

a { color: inherit; text-decoration: none; }
img, svg { display: block; }
em { font-style: normal; }

/* =================================================================
   FIXED BACKGROUND LAYERS
   ================================================================= */
#neural {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  display: block;
}

.vignette {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(120% 80% at 50% -10%, transparent 40%, rgba(6,7,9,0.55) 100%),
    radial-gradient(100% 60% at 50% 110%, rgba(6,7,9,0.9) 0%, transparent 60%);
}

.grain {
  position: fixed;
  inset: -50%;
  z-index: 2;
  pointer-events: none;
  opacity: 0.04;
  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='0.8' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 6s steps(6) infinite;
}
@keyframes grain {
  0%,100% { transform: translate(0,0); }
  20% { transform: translate(-4%, 3%); }
  40% { transform: translate(3%, -4%); }
  60% { transform: translate(-2%, 2%); }
  80% { transform: translate(2%, -2%); }
}

/* =================================================================
   CUSTOM CURSOR
   ================================================================= */
.cursor, .cursor-ring {
  position: fixed;
  top: 0; left: 0;
  z-index: 9999;
  pointer-events: none;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity 0.3s;
}
.cursor {
  width: 7px; height: 7px;
  background: var(--cyan);
  box-shadow: var(--glow-cyan);
}
.cursor-ring {
  width: 34px; height: 34px;
  border: 1px solid rgba(124, 92, 255, 0.6);
  transition: width 0.25s var(--ease), height 0.25s var(--ease),
              border-color 0.25s, opacity 0.3s, background 0.25s;
}
body.cursor-active .cursor,
body.cursor-active .cursor-ring { opacity: 1; }
body.cursor-hovering .cursor-ring {
  width: 58px; height: 58px;
  border-color: var(--cyan);
  background: rgba(45, 226, 230, 0.06);
}
body.cursor-hovering .cursor { background: #fff; }

/* =================================================================
   SCROLL PROGRESS + SKIP LINK
   ================================================================= */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: var(--grad);
  z-index: 200;
  box-shadow: 0 0 12px rgba(45,226,230,0.6);
}

.skip {
  position: fixed;
  top: -100px; left: 1rem;
  z-index: 300;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  transition: top 0.2s;
}
.skip:focus { top: 1rem; }

/* =================================================================
   BOOT VEIL
   ================================================================= */
.boot {
  position: fixed;
  inset: 0;
  z-index: 500;
  display: grid;
  place-content: center;
  gap: 1.4rem;
  background: var(--bg);
  transition: opacity 0.8s var(--ease), visibility 0.8s;
}
.boot.done { opacity: 0; visibility: hidden; }
.boot__mark {
  font-family: var(--font-mono);
  font-size: clamp(0.8rem, 2.4vw, 1rem);
  letter-spacing: 0.18em;
  color: var(--ink-dim);
  text-transform: uppercase;
  display: flex;
  gap: 0.5em;
}
.boot__bracket { color: var(--cyan); }
.boot__bar {
  width: min(260px, 60vw);
  height: 2px;
  background: var(--line);
  border-radius: 2px;
  overflow: hidden;
  justify-self: center;
}
.boot__bar i {
  display: block;
  height: 100%;
  width: 0%;
  background: var(--grad);
  box-shadow: var(--glow-cyan);
}

/* =================================================================
   NAVIGATION
   ================================================================= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 150;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem var(--pad);
  transition: padding 0.4s var(--ease), background 0.4s, border-color 0.4s, backdrop-filter 0.4s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  padding: 0.7rem var(--pad);
  background: rgba(6, 7, 9, 0.6);
  backdrop-filter: blur(14px) saturate(150%);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  border-bottom: 1px solid var(--line-soft);
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.nav__glyph { width: 34px; height: 34px; filter: drop-shadow(0 0 10px rgba(45,226,230,0.4)); }
.nav__word { font-size: 0.95rem; }
.nav__word b { color: var(--cyan); font-weight: 700; }

.nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
  font-size: 0.92rem;
  font-weight: 500;
}
.nav__links a { color: var(--ink-dim); transition: color 0.25s; position: relative; }
.nav__links a:not(.nav__cta)::after {
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 100%; height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.3s var(--ease);
}
.nav__links a:not(.nav__cta):hover { color: var(--ink); }
.nav__links a:not(.nav__cta):hover::after { transform: scaleX(1); }

.nav__cta {
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 100px;
  color: var(--ink) !important;
  transition: border-color 0.25s, background 0.25s, color 0.25s;
}
.nav__cta:hover { border-color: var(--cyan); background: rgba(45,226,230,0.08); }

.nav__burger {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: 0;
  padding: 8px;
}
.nav__burger span {
  width: 26px; height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s;
}
.nav__burger[aria-expanded="true"] span:first-child { transform: translateY(8px) rotate(45deg); }
.nav__burger[aria-expanded="true"] span:last-child  { transform: translateY(-0px) rotate(-45deg); }

/* =================================================================
   SHARED PRIMITIVES
   ================================================================= */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--ink-dim);
}
.eyebrow__dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--cyan);
  box-shadow: var(--glow-cyan);
  animation: pulse 2.4s var(--ease-in-out) infinite;
}
.eyebrow__sep { color: var(--ink-faint); }
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.7); }
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  color: var(--ink-dim);
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1.6rem;
}
.section-label span {
  color: var(--cyan);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.15rem 0.5rem;
  background: rgba(45,226,230,0.04);
}
.section-label--center { justify-content: center; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.98rem;
  padding: 0.85rem 1.5rem;
  border-radius: 100px;
  border: 1px solid transparent;
  transition: transform 0.25s var(--ease), box-shadow 0.3s, background 0.3s, border-color 0.3s, color 0.3s;
  will-change: transform;
}
.btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; transition: transform 0.3s var(--ease); }
.btn--primary {
  background: var(--grad);
  color: #05070b;
  font-weight: 600;
  box-shadow: 0 6px 30px rgba(45,226,230,0.22);
}
.btn--primary:hover { box-shadow: 0 10px 44px rgba(45,226,230,0.4); }
.btn--primary:hover svg { transform: translateX(4px); }
.btn--ghost {
  border-color: var(--line);
  color: var(--ink);
  background: rgba(255,255,255,0.015);
}
.btn--ghost:hover { border-color: var(--cyan); background: rgba(45,226,230,0.06); }
.btn--lg { padding: 1.1rem 2rem; font-size: 1.1rem; }

/* =================================================================
   HERO
   ================================================================= */
.hero {
  position: relative;
  z-index: 3;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 8rem var(--pad) 4rem;
  max-width: var(--maxw);
  margin: 0 auto;
}
.hero__inner { max-width: 60rem; }

.hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 0.92;
  letter-spacing: -0.02em;
  font-size: clamp(3.4rem, 13vw, 11rem);
  margin: 1.6rem 0 1.4rem;
}
.hero__line { display: block; position: relative; }
.hero__line--accent {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 30px rgba(124,92,255,0.25));
}

.hero__lead {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 3.6vw, 2.2rem);
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 1.4rem;
}
.rotator {
  display: inline-flex;
  position: relative;
  vertical-align: bottom;
  min-width: 8ch;
}
.rotator__word {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 700;
  white-space: nowrap;
}
.rotator__word::after { content: "."; color: var(--cyan); -webkit-text-fill-color: var(--cyan); }

.hero__sub {
  max-width: 38rem;
  font-size: clamp(1rem, 1.6vw, 1.18rem);
  color: var(--ink-dim);
  margin-bottom: 2.4rem;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 1rem; }

.scroll-cue {
  position: absolute;
  bottom: 2.2rem; left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  background: none; border: 0;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.3em;
}
.scroll-cue__line {
  width: 1px; height: 46px;
  background: linear-gradient(var(--cyan), transparent);
  position: relative;
  overflow: hidden;
}
.scroll-cue__line::after {
  content: "";
  position: absolute; top: 0; left: 0;
  width: 100%; height: 40%;
  background: var(--cyan);
  box-shadow: var(--glow-cyan);
  animation: scrollDot 2s var(--ease-in-out) infinite;
}
@keyframes scrollDot {
  0% { transform: translateY(-100%); opacity: 0; }
  40% { opacity: 1; }
  100% { transform: translateY(160%); opacity: 0; }
}

/* =================================================================
   MARQUEE
   ================================================================= */
.marquee {
  position: relative;
  z-index: 3;
  overflow: hidden;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  padding: 1.1rem 0;
  background: rgba(8,10,16,0.5);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 8%, #000 92%, transparent);
}
.marquee__track {
  display: inline-flex;
  align-items: center;
  gap: 1.6rem;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  color: var(--ink-dim);
  animation: marquee 38s linear infinite;
  will-change: transform;
}
.marquee__track span { transition: color 0.3s; }
.marquee:hover .marquee__track span { color: var(--ink); }
.marquee__track i { color: var(--cyan); font-style: normal; }
@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* =================================================================
   SECTION SHELL (post-hero is solid)
   ================================================================= */
.manifesto, .work, .process, .cta {
  position: relative;
  z-index: 3;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(5rem, 12vw, 9rem) var(--pad);
}
main > .manifesto { background: linear-gradient(to bottom, transparent, var(--bg) 18%); }

/* =================================================================
   MANIFESTO
   ================================================================= */
.manifesto__statement {
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.18;
  font-size: clamp(1.8rem, 5vw, 3.6rem);
  max-width: 22ch;
}
.manifesto__statement em {
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.manifesto__note {
  margin-top: 2.2rem;
  max-width: 46rem;
  font-size: clamp(1rem, 1.6vw, 1.2rem);
  color: var(--ink-dim);
}

/* word-by-word reveal */
[data-reveal-words] .word {
  display: inline-block;
  opacity: 0;
  transform: translateY(0.5em);
  filter: blur(6px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease), filter 0.6s var(--ease);
}
[data-reveal-words].in .word { opacity: 1; transform: none; filter: none; }

/* =================================================================
   CAPABILITIES
   ================================================================= */
.work__head { max-width: 44rem; margin-bottom: 3.4rem; }
.work__title, .process__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
}
.card {
  position: relative;
  padding: 2.2rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--bg-card);
  overflow: hidden;
  transition: transform 0.4s var(--ease), border-color 0.4s, background 0.4s;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: radial-gradient(160px 160px at var(--mx, 50%) var(--my, 0%), rgba(45,226,230,0.6), transparent 60%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.4s;
}
.card:hover {
  transform: translateY(-6px);
  border-color: rgba(45,226,230,0.28);
  background: rgba(255,255,255,0.035);
}
.card:hover::before { opacity: 1; }

.card__index {
  position: absolute;
  top: 1.6rem; right: 1.6rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  letter-spacing: 0.1em;
}
.card__icon {
  width: 56px; height: 56px;
  display: grid; place-content: center;
  border: 1px solid var(--line);
  border-radius: 14px;
  margin-bottom: 1.6rem;
  background: rgba(45,226,230,0.03);
  transition: border-color 0.4s, background 0.4s;
}
.card:hover .card__icon { border-color: rgba(45,226,230,0.3); background: rgba(45,226,230,0.07); }
.card__icon svg {
  width: 30px; height: 30px;
  fill: none; stroke: var(--cyan); stroke-width: 1.6;
  stroke-linecap: round; stroke-linejoin: round;
}
.card h3 {
  font-family: var(--font-display);
  font-size: 1.32rem;
  font-weight: 600;
  margin-bottom: 0.7rem;
}
.card p { color: var(--ink-dim); font-size: 0.98rem; }

/* =================================================================
   PROCESS
   ================================================================= */
.process__head { max-width: 44rem; margin-bottom: 3.4rem; }
.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  counter-reset: step;
}
.step {
  position: relative;
  padding: 2.2rem 1.6rem 2.2rem 0;
  border-top: 1px solid var(--line);
}
.step::before {
  content: "";
  position: absolute;
  top: -1px; left: 0;
  width: 0; height: 2px;
  background: var(--grad);
  box-shadow: 0 0 12px rgba(45,226,230,0.5);
  transition: width 0.9s var(--ease) 0.2s;
}
.step.in::before { width: 100%; }
.step__no {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--cyan);
  letter-spacing: 0.1em;
}
.step h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 1rem 0 0.7rem;
}
.step p { color: var(--ink-dim); font-size: 0.95rem; padding-right: 0.5rem; }

/* =================================================================
   CTA
   ================================================================= */
.cta { text-align: center; }
.cta__inner { max-width: 46rem; margin: 0 auto; }
.cta__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.2rem, 6.5vw, 4.6rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0.6rem 0 1rem;
}
.cta__title em {
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.cta__sub { color: var(--ink-dim); font-size: clamp(1rem, 1.8vw, 1.25rem); margin-bottom: 2.4rem; }

/* =================================================================
   FOOTER
   ================================================================= */
.footer {
  position: relative;
  z-index: 3;
  border-top: 1px solid var(--line);
  background: linear-gradient(to bottom, transparent, rgba(8,10,16,0.6));
  padding: 4rem var(--pad) 2.4rem;
  max-width: var(--maxw);
  margin: 0 auto;
}
.footer__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.4rem 3rem;
  justify-content: space-between;
  padding-bottom: 2.4rem;
  border-bottom: 1px solid var(--line-soft);
}
.footer__brand {
  display: flex; align-items: center; gap: 0.6rem;
  font-family: var(--font-display); font-weight: 600; letter-spacing: 0.04em;
}
.footer__brand b { color: var(--cyan); }
.footer__glyph { width: 30px; height: 30px; }
.footer__tagline { color: var(--ink-dim); font-size: 0.95rem; }
.footer__links { display: flex; gap: 1.6rem; font-size: 0.9rem; }
.footer__links a { color: var(--ink-dim); transition: color 0.25s; }
.footer__links a:hover { color: var(--cyan); }
.footer__bottom {
  display: flex; flex-wrap: wrap; gap: 0.8rem 2rem;
  justify-content: space-between;
  padding-top: 1.6rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--ink-faint);
}
.footer__code { color: var(--ink-dim); letter-spacing: 0.1em; }

/* =================================================================
   REVEAL
   ================================================================= */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
[data-reveal].in { opacity: 1; transform: none; }

/* scramble characters (mid-decode) */
.scr { color: var(--cyan); opacity: 0.85; }
.hero__line .scr { -webkit-text-fill-color: var(--cyan); }

/* =================================================================
   RESPONSIVE
   ================================================================= */
@media (max-width: 900px) {
  .cards { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr 1fr; }
  .step { padding-right: 1rem; }
}

@media (max-width: 720px) {
  .nav__links {
    position: fixed;
    inset: 0 0 auto 0;
    top: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.6rem;
    padding: 6rem var(--pad) 2.5rem;
    background: rgba(8,10,16,0.92);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--line);
    transform: translateY(-100%);
    transition: transform 0.45s var(--ease);
    font-size: 1.15rem;
  }
  .nav__links.open { transform: translateY(0); }
  .nav__burger { display: flex; }
  .nav__cta { align-self: flex-start; }
  .steps { grid-template-columns: 1fr; }
  .footer__top { flex-direction: column; align-items: flex-start; }
}

/* =================================================================
   REDUCED MOTION
   ================================================================= */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal], [data-reveal-words] .word { opacity: 1 !important; transform: none !important; filter: none !important; }
  .grain, .scroll-cue__line::after, .eyebrow__dot { animation: none !important; }
}