/* --- Background canvas + overlays --- */
#brain-canvas {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 0;
  pointer-events: none;
}

.scanlines, .vignette {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}
.scanlines {
  background-image: repeating-linear-gradient(
    180deg,
    rgba(90, 217, 255, 0.04) 0px,
    rgba(90, 217, 255, 0.04) 1px,
    transparent 1px,
    transparent 3px
  );
  mix-blend-mode: overlay;
  opacity: 0.65;
}
.vignette {
  background: radial-gradient(
    ellipse at center,
    transparent 40%,
    rgba(0, 0, 0, 0.6) 100%
  );
}

/* --- Header --- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 36px;
  background: linear-gradient(180deg, rgba(3, 6, 13, 0.7) 0%, rgba(3, 6, 13, 0) 100%);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.brand { display: flex; align-items: center; gap: 10px; }
.brand__mark {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: 18px;
  color: var(--cyan);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  box-shadow: var(--glow-cyan);
}
.brand__word {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.28em;
  color: var(--fg-strong);
}

.nav { display: flex; align-items: center; gap: 28px; }
.nav a {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--fg-muted);
  transition: color 160ms ease;
}
.nav a:hover { color: var(--cyan); }
.nav__cta {
  padding: 8px 14px;
  border: 1px solid var(--border-strong);
  color: var(--cyan) !important;
  border-radius: var(--radius-sm);
}
.nav__cta:hover { background: rgba(90, 217, 255, 0.1); }

/* --- Page-level layout --- */
main {
  position: relative;
  z-index: 5;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 36px;
}

.section {
  padding: var(--space-24) 0;
  position: relative;
}
.section--alt { background: rgba(6, 9, 26, 0.0); /* overlays handled by panels */ }

.section__head {
  max-width: 760px;
  margin-bottom: var(--space-12);
}
.section__eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: var(--space-4);
}
.section__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(28px, 4vw, 44px);
  letter-spacing: var(--tracking-display);
  color: var(--fg-strong);
  line-height: 1.12;
  margin-bottom: var(--space-4);
}
.section__sub {
  font-size: 16px;
  color: var(--fg-muted);
  max-width: 640px;
  line-height: 1.65;
}

/* Grids */
.grid { display: grid; gap: var(--space-6); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--tight { gap: var(--space-4); }

@media (max-width: 960px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .grid--3 { grid-template-columns: 1fr; }
  main { padding: 0 20px; }
  .site-header { padding: 14px 20px; }
  .nav { gap: 14px; }
  .nav a { font-size: 10px; }
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: calc(100vh - 0px);
  padding-top: 18vh;
  padding-bottom: var(--space-20);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
}
.hero__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: var(--space-6);
}
.hero__title {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(40px, 7vw, 88px);
  letter-spacing: var(--tracking-display);
  line-height: 1.02;
  color: var(--fg-strong);
  max-width: 14ch;
  margin-bottom: var(--space-6);
}
.hero__title em {
  font-style: italic;
  font-weight: 300;
  color: var(--cyan);
}
.hero__lede {
  max-width: 56ch;
  font-size: 17px;
  line-height: 1.6;
  color: var(--fg);
  margin-bottom: var(--space-8);
}
.hero__ctas {
  display: flex;
  gap: 12px;
  margin-bottom: var(--space-12);
}
.hero__readout {
  display: flex;
  gap: 28px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.hero__readout span { display: flex; align-items: center; gap: 8px; }
.hero__readout i {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
  animation: blink 2.4s ease-in-out infinite;
}
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.hero__corner {
  position: absolute;
  width: 22px; height: 22px;
  pointer-events: none;
}
.hero__corner::before, .hero__corner::after {
  content: ''; position: absolute; background: var(--border-strong);
}
.hero__corner::before { width: 100%; height: 1px; top: 0; left: 0; }
.hero__corner::after  { width: 1px; height: 100%; top: 0; left: 0; }
.hero__corner--tl { top: 14vh; left: 0; }
.hero__corner--tr { top: 14vh; right: 0; transform: scaleX(-1); }
.hero__corner--bl { bottom: 8vh; left: 0; transform: scaleY(-1); }
.hero__corner--br { bottom: 8vh; right: 0; transform: scale(-1); }

/* --- Footer --- */
.site-footer {
  position: relative;
  z-index: 5;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--space-12) 36px var(--space-16);
  display: flex;
  justify-content: space-between;
  gap: var(--space-8);
  border-top: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
@media (max-width: 640px) {
  .site-footer { flex-direction: column; padding: var(--space-10) 20px; }
}