.top-nav {
  overflow-x: auto;
  white-space: nowrap;
}

.top-nav::-webkit-scrollbar {
  height: 0.45rem;
}

.top-nav::-webkit-scrollbar-thumb {
  background: rgba(0, 212, 255, 0.35);
  border-radius: var(--radius-sm);
}

.hero {
  min-height: min(100dvh, 52rem);
  background:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 2px,
      rgba(0, 0, 0, 0.08) 2px,
      rgba(0, 0, 0, 0.08) 4px
    ),
    linear-gradient(135deg, #0a0e1a 0%, #131929 50%, #0d1a3a 100%),
    url("../assets/backgrounds/hero-bg-desktop.svg");
  background-size: auto, cover, cover;
  background-position: center;
}

.hero p {
  max-width: 62ch;
}

.section > * + * {
  margin-top: var(--spacing-lg);
}

.hero__content {
  backdrop-filter: blur(1px);
}

.section-heading {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.section-icon {
  width: 2rem;
  height: 2rem;
  filter: drop-shadow(0 0 8px rgba(0, 212, 255, 0.35));
}

.section-media {
  border: 1px solid rgba(0, 212, 255, 0.25);
  border-radius: var(--radius-md);
  background: var(--color-surface-elevated);
  padding: var(--spacing-sm);
}

.section-cta {
  text-align: center;
}

.section-cta .btn {
  max-width: 22rem;
  margin-inline: auto;
}

.section-media img {
  width: 100%;
}

.section ul {
  margin: 0;
  padding-left: 1.15rem;
}

.section li {
  margin-bottom: 0.35rem;
}

.reaction-schema {
  margin-block: var(--spacing-lg);
}

.reaction-schema p:last-of-type {
  margin-bottom: var(--spacing-sm);
}

.reaction-schema figcaption {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.section__grid--three,
.section__grid--four {
  display: grid;
  gap: var(--spacing-lg);
}

.hero__visual,
.infobox,
.section-media,
.reaction-schema,
.quiz-card,
.score-card {
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.reveal-on-scroll {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

.reveal-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.infobox:hover,
.section-media:hover,
.reaction-schema:hover {
  transform: translateY(-2px);
}

.hero__visual {
  animation: drift 6s ease-in-out infinite;
}

@keyframes drift {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero__visual {
    animation: none;
  }

  .infobox:hover,
  .section-media:hover,
  .reaction-schema:hover {
    transform: none;
  }

  .reveal-on-scroll {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero {
    background-image:
      linear-gradient(135deg, #0a0e1a 0%, #131929 50%, #0d1a3a 100%),
      url("../assets/backgrounds/hero-bg-desktop.svg");
  }
}