:root {
  --bg-color: #04010f;
  --text-color: #eef6ff;
  --grid-color: rgba(0, 255, 213, 0.3);
  --card-background: rgba(6, 12, 24, 0.85);
  --card-border: rgba(0, 255, 213, 0.4);
  --accent-hue: 200;
  --accent-color: hsl(var(--hue-shift, var(--accent-hue)) 85% 60%);
  --glow-color: hsla(var(--hue-shift, var(--accent-hue)) 90% 60% / 0.55);
  --scanline-color: rgba(255, 255, 255, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Orbitron', 'Share Tech Mono', 'Courier New', monospace;
  background: var(--bg-color);
  color: var(--text-color);
  min-height: 100vh;
  overflow-x: hidden;
}

.skip-link {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  padding: 0.5rem 1rem;
  background: #000;
  color: #fff;
  border-radius: 0.5rem;
  transform: translateY(-120%);
  transition: transform 200ms ease;
  z-index: 999;
}

.skip-link:focus {
  transform: translateY(0);
  outline: 2px solid #fff;
  outline-offset: 2px;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    0deg,
    var(--scanline-color) 0,
    var(--scanline-color) 1px,
    transparent 1px,
    transparent 3px
  );
  opacity: 0.2;
  mix-blend-mode: screen;
  z-index: 5;
}

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(2rem, 6vw, 7rem);
  text-align: center;
  overflow: hidden;
  background:
    radial-gradient(120% 120% at 50% 0%, rgba(255, 0, 128, 0.35), transparent),
    radial-gradient(140% 140% at 50% 110%, rgba(0, 180, 255, 0.28), transparent),
    var(--bg-color);
}

.hero::before {
  content: '';
  position: absolute;
  inset: -25% -50% -70% -50%;
  background-image:
    linear-gradient(to right, var(--grid-color) 1px, transparent 1px),
    linear-gradient(to top, var(--grid-color) 1px, transparent 1px);
  background-size: 140px 140px;
  transform: perspective(800px) rotateX(72deg);
  transform-origin: top center;
  opacity: 0.6;
  filter: drop-shadow(0 0 12px rgba(0, 255, 213, 0.4));
  z-index: 0;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 30%, hsla(var(--hue-shift, var(--accent-hue)) 90% 65% / 0.4), transparent 60%),
    radial-gradient(circle at 80% 60%, hsla(calc(var(--hue-shift, var(--accent-hue)) + 40) 95% 65% / 0.35), transparent 65%),
    radial-gradient(circle at 20% 80%, hsla(calc(var(--hue-shift, var(--accent-hue)) + 120) 90% 60% / 0.25), transparent 70%);
  mix-blend-mode: screen;
  opacity: 0.75;
  pointer-events: none;
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1024px;
  width: min(100%, 1040px);
}

.hero-header {
  margin-bottom: clamp(2rem, 4vw, 3.5rem);
}

.hero-eyebrow {
  letter-spacing: 0.35em;
  font-size: clamp(0.65rem, 1.4vw, 0.9rem);
  text-transform: uppercase;
  color: rgba(238, 246, 255, 0.66);
  margin: 0 0 1rem;
}

.hero-header h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  line-height: 1.1;
  text-shadow: 0 0 20px rgba(0, 255, 213, 0.2), 0 0 40px rgba(255, 0, 128, 0.2);
}

.hero-subhead {
  margin: 0;
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: rgba(238, 246, 255, 0.75);
}

.lang-grid {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  justify-items: center;
}

.lang-card {
  position: relative;
  width: min(100%, 400px);
  padding: clamp(2rem, 4vw, 2.75rem);
  background: var(--card-background);
  border: 1px solid var(--card-border);
  border-radius: 22px;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.05) inset,
    0 25px 55px rgba(0, 0, 0, 0.6),
    0 0 35px rgba(0, 255, 213, 0.15);
  overflow: hidden;
  transition: transform 350ms ease, box-shadow 350ms ease;
  backdrop-filter: blur(6px);
}

.lang-card__glow {
  position: absolute;
  inset: -40%;
  background: radial-gradient(circle at center, var(--glow-color), transparent 65%);
  opacity: 0;
  transition: opacity 350ms ease;
  pointer-events: none;
  z-index: 0;
}

.lang-card__header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
}

.lang-card__flag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  border: 1px solid rgba(238, 246, 255, 0.35);
  background: rgba(238, 246, 255, 0.06);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
}

.lang-card h2 {
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  margin: 0;
}

.lang-card__copy {
  font-family: 'Share Tech Mono', 'Courier New', monospace;
  font-size: clamp(0.95rem, 1.8vw, 1.1rem);
  line-height: 1.6;
  color: rgba(238, 246, 255, 0.82);
  margin: 0 0 1.8rem;
  position: relative;
  z-index: 1;
}

.lang-card__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.85rem 1.75rem;
  border-radius: 999px;
  border: 1px solid rgba(238, 246, 255, 0.5);
  text-decoration: none;
  color: var(--text-color);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transition: background 300ms ease, box-shadow 300ms ease, color 300ms ease;
  position: relative;
  z-index: 1;
  background: rgba(238, 246, 255, 0.08);
  box-shadow: 0 0 15px rgba(255, 255, 255, 0.18);
}

.lang-card__cta span {
  display: inline-block;
}

.cta-icon {
  width: 1.4rem;
  height: 1.4rem;
}

.lang-card:hover,
.lang-card:focus-within {
  transform: translateY(-8px) scale(1.02);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.09) inset,
    0 30px 65px rgba(0, 0, 0, 0.65),
    0 0 45px rgba(0, 255, 213, 0.22);
}

.lang-card:hover .lang-card__glow,
.lang-card:focus-within .lang-card__glow {
  opacity: 0.8;
}

.lang-card__cta:hover,
.lang-card__cta:focus-visible {
  background: var(--accent-color);
  color: #02040a;
  box-shadow: 0 0 25px var(--accent-color);
}

.particle-field {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  overflow: hidden;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.75);
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.6);
  opacity: 0.7;
  animation: float 8s linear infinite;
}

@keyframes float {
  from {
    transform: translate3d(var(--x-offset), 100vh, 0);
    opacity: 0;
  }
  20% {
    opacity: 0.8;
  }
  to {
    transform: translate3d(var(--x-offset), -10vh, 0);
    opacity: 0;
  }
}

@media (max-width: 768px) {
  .hero {
    padding: clamp(2rem, 6vw, 3rem) clamp(1.5rem, 5vw, 2.5rem);
  }

  .hero-header h1 {
    font-size: clamp(2rem, 7vw, 3.3rem);
  }

  .lang-card {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  body::after {
    opacity: 0.12;
  }

  .lang-card,
  .lang-card__glow,
  .lang-card__cta {
    transition: none;
  }
}