/* Reset and base */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
html { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif; }
body { margin: 0; padding: 0; color: #0b1a2b; min-height: 100vh; display: grid; place-items: start center;
  /* Yellow gradient background to set the cyberpunk vibe */
  background: linear-gradient(135deg, #fff200 0%, #ffd400 40%, #ffd54f 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
}

/* Layout container */
main { width: 100%; }

/* Header styling (minimal, keeps focus on hero) */
.site-header { text-align: center; padding: 1rem 1rem 0.5rem; }
.site-header .tagline { font-size: 0.95rem; color: rgba(0, 0, 0, 0.7); }

/* Hero section: grid/flex mix, mobile-first */
.hero-grid { display: grid; grid-template-columns: 1fr; gap: 1.25rem; align-items: center; padding: 1rem; width: 100%; }

/* Prominent frosted glass card for the content area */
.hero-content {
  background: rgba(255, 255, 255, 0.20);
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 14px;
  padding: 1.5rem;
  max-width: 720px;
  margin: 0 auto;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}

/* Centered, accessible heading and subhead */
.hero-content h1 {
  font-size: clamp(1.6rem, 4vw, 3rem);
  line-height: 1.08;
  margin: 0 0 0.75rem;
  color: #0b1a2b;
  text-shadow: 0 1px 0 rgba(255,255,255,0.6);
}
.hero-content .subhead {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: #0a2a3a;
  margin: 0 0 1rem;
}

/* CTA as the visual centerpiece (link styled as button) */
.cta {
  display: inline-block;
  padding: 1rem 1.35rem;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  color: #041019;
  background: linear-gradient(135deg, #00e5ff 0%, #00ffd1 100%);
  border: 2px solid rgba(0,0,0,0.05);
  box-shadow: 0 6px 16px rgba(0, 230, 255, 0.5);
  transition: transform .2s ease, box-shadow .2s ease;
}
.cta:hover { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(0, 230, 255, 0.7); }
.cta:focus-visible { outline: 3px solid #00e7ff; outline-offset: 2px; }

/* Hero media (image) - prominent centerpiece on larger viewports */
.hero-media { display: flex; justify-content: center; align-items: center; padding: 0; }
.hero-media img { width: 100%; height: auto; border-radius: 14px; box-shadow: 0 10px 25px rgba(0,0,0,0.15); }

/* Footer advertisement and closing note */
.site-footer { text-align: center; padding: 1rem; }
.footer-ad {
  display: inline-block;
  font-size: 0.9rem;
  color: #032b3a;
  text-decoration: none;
  padding: 0.5rem 0.75rem;
  border-radius: 10px;
  background: rgba(0, 230, 255, 0.15);
  border: 1px solid rgba(0, 230, 255, 0.4);
}
.closing-note { font-size: 0.9rem; color: rgba(0,0,0,0.65); margin-top: 0.4rem; }

/* Focus visibility for keyboard accessibility on all interactive elements */
:focus-visible { outline: 3px solid #00e7ff; outline-offset: 2px; }

/* Responsive adjustments: two-column layout with image as centerpiece on larger screens */
@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    gap: 2rem;
    padding: 2rem;
  }
  /* On large screens, slightly reduce the frosted glass intensity for contrast */
  .hero-content { padding: 1.75rem; }
}