:root {
  --bg: #0b0f14;
  --bg-dark: #0a0f14;
  --cyan: #00e5ff;
  --cyan-dark: #00c7d6;
  --glass: rgba(9, 18, 32, 0.65);
  --border: rgba(0, 238, 255, 0.28);
  --text: #eaffff;
  --muted: #b9f0ff;
}

*,
*::before,
*::after { box-sizing: border-box; }

html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Inter, Arial;
  color: var(--text);
  background-color: var(--bg);
  /* gray noise texture (subtle) */
  background-image:
    radial-gradient(circle at 1px 1px, rgba(255,255,255,.08) 1px, transparent 1px),
    radial-gradient(circle at 3px 3px, rgba(0,0,0,.25) 1px, transparent 1px),
    radial-gradient(circle at 7px 7px, rgba(0,255,255,.04) 1px, transparent 1px);
  background-size: 4px 4px, 4px 4px, 14px 14px;
  background-blend-mode: overlay;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  display: grid;
  place-items: center;
  padding: 2rem 1rem;
  min-height: calc(100vh - 140px);
}

.image-frame {
  width: min(92vw, 720px);
  padding: 1rem;
  border-radius: 16px;
  background: rgba(12, 26, 40, 0.60); /* frosted glass base */
  border: 1px solid var(--border);
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.65),
    inset 0 0 0 1px rgba(0, 255, 255, 0.15);
  backdrop-filter: blur(6px) saturate(1.25);
  -webkit-backdrop-filter: blur(6px) saturate(1.25);
}

.image-frame img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  outline: 2px solid rgba(0, 255, 255, 0.28);
  outline-offset: 2px;
  -webkit-filter: saturate(1.05);
  filter: saturate(1.05);
}

footer {
  padding: 1.75rem 1rem;
  background: rgba(5, 8, 18, 0.85);
  border-top: 1px solid rgba(0, 255, 255, 0.25);
  color: var(--text);
}

.product-ad {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .75rem;
  border-radius: 12px;
  background: rgba(0,0,0,0.25);
  border: 1px solid rgba(0, 255, 255, 0.25);
  margin-bottom: .75rem;
}

.product-ad h3 {
  font-size: 1rem;
  color: var(--cyan);
  margin: 0;
  letter-spacing: .2px;
}

.product-ad p { margin: 0; color: var(--muted); }

.product-ad a {
  display: inline-block;
  padding: .55rem .9rem;
  border-radius: 8px;
  background: rgba(0, 226, 255, 0.25);
  color: #eaffff;
  text-decoration: none;
  border: 1px solid rgba(0, 226, 255, 0.5);
  transition: transform .15s ease, background .15s ease;
}
.product-ad a:hover {
  background: rgba(0, 226, 255, 0.45);
  transform: translateY(-1px);
}
.product-ad a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

footer p {
  margin: 0;
  text-align: center;
  padding-top: .25rem;
  font-size: .9rem;
  color: #b6f3ff;
}

/* Accessibility: focus styles for keyboard navigation */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

@media (min-width: 720px) {
  main { padding: 3rem 2rem; min-height: 70vh; }
  .product-ad { align-items: center; }
}