/* Reset and baseline */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  color: #e9e9e9;
  /* Silver checkerboard background (mobile-first, subtle glow) */
  background-color: #c0c0c0;
  background-image:
    linear-gradient(45deg, rgba(0,0,0,.15) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(0,0,0,.15) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(0,0,0,.15) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(0,0,0,.15) 75%);
  background-size: 22px 22px;
  background-position: 0 0, 0 11px, 11px -11px, -11px 0px;
  /* Subtle cyber vibe ambient glow (no heavy load) */
  text-rendering: optimizeLegibility;
}

/* Layout */
main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem 1rem 2rem;
  min-height: calc(100vh - 120px);
}

/* Frosted glass hero frame */
.image-frame {
  width: min(92vw, 860px);
  margin: 1.75rem auto;
  border-radius: 14px;
  overflow: hidden;
  background: rgba(255,255,255,0.14);
  border: 1px solid rgba(255,255,255,0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  box-shadow: 0 10px 40px rgba(0,0,0,.45);
}

.image-frame img {
  display: block;
  width: 100%;
  height: auto;
  image-rendering: auto;
}

/* Footer and CTA area */
footer {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1.25rem 1rem 2rem;
  color: #e9e9e9;
  background: rgba(0,0,0,.25);
  border-top: 1px solid rgba(255,255,255,.15);
  gap: .5rem;
}

.product-ad {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  background: rgba(0,0,0,.28);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 12px;
  padding: 0.75rem 1rem;
  text-align: center;
  width: min(92%, 520px);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

.product-ad h3 {
  font-size: 1.05rem;
  margin: 0.25rem 0 0.5rem;
  color: #ffd6d6;
}

.product-ad a { text-decoration: none; }

/* CTA button style (prominent) */
.product-ad a p {
  display: inline-block;
  margin: 0;
  padding: 12px 20px;
  border-radius: 8px;
  background: #e6001a;
  color: #fff;
  font-weight: 700;
  letter-spacing: .2px;
  border: 1px solid rgba(0,0,0,.25);
  box-shadow: 0 6px 14px rgba(0,0,0,.6);
  transition: transform .15s ease, background .2s ease;
}
.product-ad a p:hover {
  transform: translateY(-1px);
  background: #ff2a2a;
}
.product-ad a:focus-visible,
.product-ad a p:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 2px;
  box-shadow: 0 0 0 3px rgba(229, 7, 7, 0.6);
}

/* Global focus accessibility for keyboard users */
a:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 2px;
  border-radius: 6px;
  box-shadow: 0 0 0 3px rgba(255,255,255,.25);
}

/* Text readability on glass panels */
.image-frame, .product-ad, footer {
  color: #f3f3f3;
}

/* Responsive adjustments (mobile-first) */
@media (min-width: 600px) {
  main { padding: 2.5rem 1.25rem 3rem; }
  .image-frame { width: min(72vw, 760px); }
  .product-ad { flex-direction: column; }
}

@media (min-width: 900px) {
  .image-frame { width: min(60vw, 900px); }
  footer { padding: 1.75rem 2rem 2.5rem; }
  .product-ad h3 { font-size: 1.15rem; }
}