:root {
  --bg: #0b0e14;
  --bg-alt: #10141d;
  --surface: #161b26;
  --surface-border: #232a3a;
  --text: #e8ecf4;
  --text-dim: #9aa5b8;
  --accent: #4fd8ff;
  --accent-2: #7c6cff;
  --accent-text: #06121a;
  --radius: 14px;
  --max-width: 1120px;
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.6);

  --glow-1: rgba(79, 216, 255, 0.45);
  --glow-2: rgba(124, 108, 255, 0.4);
  --grid-line: rgba(255, 255, 255, 0.05);
  --glass-bg: rgba(22, 27, 38, 0.55);
  --glass-border: rgba(255, 255, 255, 0.09);

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fb;
    --bg-alt: #ffffff;
    --surface: #ffffff;
    --surface-border: #e2e7f0;
    --text: #141a26;
    --text-dim: #566078;
    --accent: #0091b8;
    --accent-2: #5b45e0;
    --accent-text: #ffffff;
    --shadow: 0 20px 60px -20px rgba(20, 26, 38, 0.15);

    --glow-1: rgba(0, 145, 184, 0.16);
    --glow-2: rgba(91, 69, 224, 0.14);
    --grid-line: rgba(20, 26, 38, 0.05);
    --glass-bg: rgba(255, 255, 255, 0.65);
    --glass-border: rgba(20, 26, 38, 0.08);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

img, svg { max-width: 100%; display: block; }

/* Ambient background: fixed dot-grid + drifting aurora glow, sits behind everything */
.bg-fx {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.bg-grid {
  position: absolute;
  inset: -1px;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(ellipse 75% 55% at 50% 0%, black 35%, transparent 100%);
  mask-image: radial-gradient(ellipse 75% 55% at 50% 0%, black 35%, transparent 100%);
}
.bg-aurora span {
  position: absolute;
  width: 46vw;
  height: 46vw;
  min-width: 380px;
  min-height: 380px;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.6;
  animation: drift 24s ease-in-out infinite alternate;
  will-change: transform;
}
.bg-aurora span:nth-child(1) { background: var(--glow-1); top: -12%; left: -10%; }
.bg-aurora span:nth-child(2) { background: var(--glow-2); top: 6%; right: -16%; animation-duration: 28s; animation-delay: -6s; }
.bg-aurora span:nth-child(3) { background: var(--glow-1); bottom: -22%; left: 22%; animation-duration: 32s; animation-delay: -14s; opacity: 0.4; }

@keyframes drift {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(6%, 8%) scale(1.18); }
}

/* Scroll progress indicator */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 16px var(--glow-1);
  z-index: 999;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 14, 20, 0.75);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--surface-border);
}

@media (prefers-color-scheme: light) {
  .site-header { background: rgba(255, 255, 255, 0.75); }
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand { display: flex; align-items: center; }
.brand-mark {
  font-weight: 800;
  font-size: 1.3rem;
  letter-spacing: 0.03em;
  background: linear-gradient(120deg, var(--accent), var(--accent-2), var(--accent));
  background-size: 220% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradient-flow 7s ease infinite;
}
.brand:hover { text-decoration: none; }

@keyframes gradient-flow {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  color: var(--text-dim);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s ease;
}
.site-nav a:hover, .site-nav a.active { color: var(--text); text-decoration: none; }

.nav-cta {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: var(--accent-text) !important;
  padding: 9px 18px;
  border-radius: 999px;
  font-weight: 600;
  box-shadow: 0 6px 20px -8px var(--glow-2);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 10px 26px -8px var(--glow-2); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: 1px solid var(--surface-border);
  border-radius: 8px;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 0 auto;
  background: var(--text);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* Sections */
main { display: block; }

.section {
  padding: 88px 0;
}
.section-tight { padding: 56px 0; }
.section-alt {
  background: var(--bg-alt);
  position: relative;
}
.section-alt::before, .section-alt::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glass-border) 50%, transparent);
}
.section-alt::before { top: 0; }
.section-alt::after { bottom: 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-weight: 700;
  font-family: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px 2px var(--glow-1);
  flex-shrink: 0;
}

h1, h2, h3 { line-height: 1.15; margin: 0 0 16px; }
h1 { font-size: clamp(2.2rem, 5vw, 3.4rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.2rem); letter-spacing: -0.01em; }
h3 { font-size: 1.2rem; }

@media (prefers-color-scheme: dark) {
  .hero h1, .page-hero h1 { text-shadow: 0 0 50px var(--glow-1); }
}

p { color: var(--text-dim); margin: 0 0 16px; }
p.lead { font-size: 1.15rem; color: var(--text); }

/* Hero */
.hero {
  padding: 110px 0 90px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(560px circle at var(--mx, 50%) var(--my, 15%), var(--glow-1), transparent 62%);
  opacity: 0.55;
  pointer-events: none;
  transition: opacity 0.4s ease;
}
.hero .wrap { position: relative; max-width: 780px; }
.hero p.lead { margin: 0 auto 36px; max-width: 620px; }

/* Brand orb — the animated/still hero visual */
.hero-orb {
  width: clamp(260px, 34vw, 460px);
  height: clamp(260px, 34vw, 460px);
  margin: 0 auto 28px;
  border-radius: 50%;
  overflow: hidden;
  position: relative;
  border: 1px solid var(--glass-border);
  box-shadow: 0 0 90px -10px var(--glow-1), 0 0 180px -25px var(--glow-2);
  animation: orb-float 6s ease-in-out infinite;
}
.hero-orb video, .hero-orb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.hero-orb--sm {
  width: 108px;
  height: 108px;
  margin-bottom: 20px;
  animation-duration: 7s;
}
@keyframes orb-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
@media (prefers-reduced-motion: reduce) {
  .hero-orb { animation: none; }
}

.btn-row {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  position: relative;
  overflow: hidden;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.98rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), border-color 0.25s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: var(--accent-text);
  box-shadow: 0 10px 30px -10px var(--glow-2);
}
.btn-primary:hover { box-shadow: 0 16px 38px -8px var(--glow-2); }
.btn-primary::after {
  content: "";
  position: absolute;
  top: 0;
  left: -60%;
  width: 40%;
  height: 100%;
  background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  transform: skewX(-20deg);
  transition: left 0.7s ease;
}
.btn-primary:hover::after { left: 140%; }
.btn-secondary {
  background: transparent;
  border-color: var(--surface-border);
  color: var(--text);
}
.btn-secondary:hover { border-color: var(--accent); box-shadow: 0 10px 26px -14px var(--glow-1); }

/* Cards / grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

.card, .panel, .contact-item {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s ease;
}
.card::before, .panel::before, .contact-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), var(--accent-2), transparent);
  background-size: 220% 100%;
  opacity: 0.85;
  animation: gradient-flow 8s linear infinite;
}
.card:hover, .contact-item:hover {
  transform: translateY(-6px);
  border-color: var(--glow-1);
  box-shadow: 0 24px 48px -20px var(--glow-1);
}

.card { padding: 28px; }

.card .icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  font-size: 1.5rem;
  margin-bottom: 14px;
  background: linear-gradient(135deg, var(--glow-1), var(--glow-2));
  border: 1px solid var(--glass-border);
  box-shadow: 0 0 24px -10px var(--glow-1);
  transition: transform 0.3s var(--ease);
}
.card:hover .icon { transform: scale(1.08) rotate(-4deg); }

.card h3 { margin-bottom: 8px; }
.card p { margin-bottom: 0; font-size: 0.95rem; }

/* Two-column */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
@media (max-width: 760px) {
  .split { grid-template-columns: 1fr; }
}

.panel { padding: 32px; box-shadow: var(--shadow); }

/* Brain diagram visual aid */
.panel-visual { text-align: center; }
.brain-diagram { margin: -6px -6px 12px; }
.brain-diagram svg { width: 100%; height: auto; max-height: 240px; }
.brain-diagram .node-pulse {
  transform-box: fill-box;
  transform-origin: center;
  animation: node-pulse 2.6s ease-in-out infinite;
}
.brain-diagram .node-pulse:nth-of-type(2) { animation-delay: 0.6s; }
.brain-diagram .node-pulse:nth-of-type(3) { animation-delay: 1.2s; }
@keyframes node-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.4); }
}
@media (prefers-reduced-motion: reduce) {
  .brain-diagram .node-pulse { animation: none; }
}

/* Page header (non-home) */
.page-hero {
  padding: 72px 0 48px;
  position: relative;
}
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(480px circle at 18% 0%, var(--glow-1), transparent 65%);
  opacity: 0.5;
  pointer-events: none;
}
.page-hero .wrap { position: relative; }
.page-hero .eyebrow { margin-bottom: 12px; }
.page-hero p.lead { max-width: 680px; }

/* Lists */
.check-list { list-style: none; padding: 0; margin: 0; }
.check-list li {
  padding-left: 32px;
  position: relative;
  margin-bottom: 14px;
  color: var(--text-dim);
}
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 1px;
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--glow-1);
  box-shadow: 0 0 14px -3px var(--glow-1);
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 700;
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
@media (max-width: 760px) {
  .contact-grid { grid-template-columns: 1fr; }
}
.contact-item { padding: 24px; }
.contact-item .label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 6px;
}
.contact-item .value {
  font-size: 1.1rem;
  font-weight: 600;
}

.notice {
  background: var(--glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px dashed var(--glass-border);
  border-radius: var(--radius);
  padding: 18px 22px;
  font-size: 0.9rem;
  color: var(--text-dim);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--surface-border);
  padding: 48px 0;
  margin-top: 40px;
  position: relative;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), var(--accent-2), transparent);
  opacity: 0.5;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
}
.footer-brand p { margin: 4px 0 0; font-size: 0.85rem; }
.footer-nav { display: flex; gap: 20px; }
.footer-nav a { color: var(--text-dim); font-size: 0.9rem; }
.footer-legal { width: 100%; font-size: 0.8rem; color: var(--text-dim); margin: 16px 0 0; }

/* 404 */
.error-page { text-align: center; padding: 140px 0; }
.error-code {
  font-size: 5rem;
  font-weight: 800;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 8px;
  animation: flicker 5s infinite;
}
@keyframes flicker {
  0%, 19%, 21%, 23%, 25%, 54%, 56%, 100% { opacity: 1; }
  20%, 24%, 55% { opacity: 0.45; }
}

/* Scroll-reveal (classes applied by main.js) */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* Mobile nav */
@media (max-width: 760px) {
  .nav-toggle { display: flex; }
  .site-nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--surface-border);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 24px 20px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.18s ease, opacity 0.18s ease;
  }
  .site-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .site-nav a { padding: 12px 0; border-bottom: 1px solid var(--surface-border); }
  .nav-cta { margin-top: 12px; text-align: center; }
}

/* Reduced motion: kill decorative animation, keep instant state changes */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .bg-aurora span,
  .brand-mark,
  .card::before, .panel::before, .contact-item::before,
  .error-code {
    animation: none !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .btn, .card, .contact-item, .nav-cta {
    transition: none;
  }
}