.site-shell {
  position: relative;
  overflow: hidden;
}

.site-shell::before {
  content: "";
  position: fixed;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(255, 255, 255, 0.5) 0 1px, transparent 1px),
    radial-gradient(circle, rgba(69, 181, 255, 0.28) 0 1px, transparent 1px),
    radial-gradient(circle at top, rgba(255, 181, 46, 0.12), transparent 28%);
  background-size: 120px 120px, 180px 180px, auto;
  background-position: 0 0, 40px 60px, 50% 0;
  opacity: 0.17;
  pointer-events: none;
}

.container {
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: rgba(10, 7, 20, 0.8);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.header-inner,
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.hero {
  padding: clamp(4rem, 9vw, 6rem) 0 var(--space-7);
}

.hero-grid,
.feature-grid,
.support-grid,
.about-grid,
.page-hero-grid,
.split-grid {
  display: grid;
  gap: var(--space-6);
  align-items: center;
}

.hero-grid,
.feature-grid,
.about-grid,
.support-grid,
.page-hero-grid,
.split-grid {
  grid-template-columns: 1fr;
}

.section {
  padding: var(--space-7) 0;
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.library-grid,
.route-grid,
.detail-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

.site-footer {
  padding: var(--space-6) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  margin-top: var(--space-7);
}

@media (min-width: 720px) {
  .library-grid,
  .route-grid,
  .detail-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 980px) {
  .hero-grid,
  .feature-grid,
  .about-grid,
  .support-grid,
  .page-hero-grid,
  .split-grid {
    grid-template-columns: 1.08fr 0.92fr;
  }

  .card-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .library-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .header-inner,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    width: 100%;
  }
}

@media (max-width: 640px) {
  .section {
    padding: 2.5rem 0;
  }

  .nav-links {
    gap: 0.75rem;
  }
}