:root {
  --navy: #1D3C6E;
  --navy-deep: #142a4f;
  --blue: #1A8BC4;
  --cyan: #00C8E8;
  --white: #FFFFFF;
  --ink: rgba(255, 255, 255, 0.92);
  --ink-mute: rgba(255, 255, 255, 0.68);
  --ink-quiet: rgba(255, 255, 255, 0.45);
  --hairline: rgba(255, 255, 255, 0.14);
  --max: 920px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--navy-deep);
  color: var(--ink);
  font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  overflow-x: hidden;
}

body {
  background:
    radial-gradient(ellipse at top, #244781 0%, var(--navy) 38%, var(--navy-deep) 100%);
  position: relative;
}

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 1rem;
  top: 1rem;
  background: var(--cyan);
  color: var(--navy);
  padding: 0.5rem 0.9rem;
  border-radius: 6px;
  z-index: 1000;
}

/* Decorative background layers */
.stage {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.32;
}
.orb-1 {
  width: 540px; height: 540px;
  top: -160px; left: -120px;
  background: var(--blue);
}
.orb-2 {
  width: 460px; height: 460px;
  bottom: -180px; right: -140px;
  background: var(--cyan);
  opacity: 0.18;
}
.grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--hairline) 1px, transparent 1px),
    linear-gradient(90deg, var(--hairline) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
  opacity: 0.5;
}

/* Top bar */
.topbar {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem clamp(1.25rem, 4vw, 3rem);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--white);
  border-radius: 8px;
}
.brand:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}
.brand-symbol { display: block; }
.brand-core { transform-origin: 50px 50px; animation: pulse 2.6s ease-in-out infinite; }
.brand-wordmark {
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.03em;
}
.badge {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-mute);
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--hairline);
  border-radius: 999px;
}

/* Hero */
.hero {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(2rem, 6vw, 4.5rem) clamp(1.25rem, 4vw, 3rem) clamp(3rem, 6vw, 5rem);
  text-align: center;
}

.symbol-stage {
  display: flex;
  justify-content: center;
  margin-bottom: 2rem;
}
.symbol-stage svg { display: block; }

.ring {
  transform-origin: 50px 50px;
  animation: drift 14s linear infinite;
}
.ring-1 { opacity: 0.55; animation-duration: 9s; }
.ring-2 { opacity: 0.4; animation-duration: 16s; animation-direction: reverse; }
.ring-3 { opacity: 0.22; animation-duration: 22s; }
.node {
  transform-origin: 50px 50px;
  animation: nodepulse 3.2s ease-in-out infinite;
}
.node:nth-of-type(2) { animation-delay: 0.5s; }
.node:nth-of-type(3) { animation-delay: 1s; }
.core {
  transform-origin: 50px 50px;
  animation: corepulse 2.4s ease-in-out infinite;
  filter: drop-shadow(0 0 10px rgba(0, 200, 232, 0.55));
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.12); }
}
@keyframes corepulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.2); opacity: 0.75; }
}
@keyframes nodepulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
@keyframes drift {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.eyebrow {
  margin: 0 0 1rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.78rem;
  color: var(--cyan);
  font-weight: 500;
}

.headline {
  margin: 0 0 1.25rem;
  font-weight: 500;
  font-size: clamp(2.1rem, 5vw, 3.6rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--white);
}

.lede {
  margin: 0 auto 2.5rem;
  max-width: 640px;
  color: var(--ink-mute);
  font-size: clamp(1rem, 1.4vw, 1.125rem);
}

.dimensions {
  list-style: none;
  margin: 0 0 2.75rem;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  text-align: left;
}
.dimensions li {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 1.1rem 1.2rem;
  display: grid;
  gap: 0.35rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.dimensions li:hover {
  border-color: rgba(0, 200, 232, 0.55);
  transform: translateY(-2px);
}
.dim-num {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
  font-weight: 600;
}
.dim-title {
  font-weight: 500;
  font-size: 1rem;
  color: var(--white);
}
.dim-body {
  font-size: 0.875rem;
  color: var(--ink-quiet);
  line-height: 1.5;
}

.cta {
  display: flex;
  gap: 0.85rem;
  justify-content: center;
  flex-wrap: wrap;
}
.cta-primary, .cta-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.5rem;
  border-radius: 10px;
  font-weight: 500;
  font-size: 0.95rem;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
  min-height: 44px;
}
.cta-primary {
  background: var(--cyan);
  color: var(--navy);
  border: 1px solid var(--cyan);
}
.cta-primary:hover { background: #1ad6f3; transform: translateY(-1px); }
.cta-primary:focus-visible { outline: 2px solid var(--white); outline-offset: 3px; }
.cta-secondary {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--hairline);
}
.cta-secondary:hover { border-color: var(--ink-mute); color: var(--white); }
.cta-secondary:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }

/* Footer */
.foot {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--hairline);
  padding: 1.5rem clamp(1.25rem, 4vw, 3rem);
  color: var(--ink-quiet);
  font-size: 0.82rem;
}
.foot-row {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}
.foot-sep { color: var(--ink-quiet); opacity: 0.5; }
.foot a { color: var(--ink-mute); text-decoration: none; }
.foot a:hover { color: var(--white); }
.foot a:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 4px; }

/* Responsive */
@media (max-width: 720px) {
  .dimensions { grid-template-columns: 1fr; }
  .symbol-stage svg { width: 170px; height: 170px; }
  .badge { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .ring, .node, .core, .brand-core { animation: none !important; }
  .cta-primary:hover { transform: none; }
  .dimensions li:hover { transform: none; }
}