/* Reset & base */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
:root {
  --bg: #0b0f14;
  --fg: #e6fbff;
  --cyan: #00e5ff;
  --cyan-dark: #00b7d1;
  --glass: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(0, 255, 255, 0.25);
  --shadow: rgba(0,0,0,0.45);
}
html { font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto; color-scheme: dark; }
body {
  margin: 0;
  padding: 0;
  color: var(--fg);
  background-color: var(--bg);
  /* Silver carbon fiber look */
  background-image:
    linear-gradient(135deg, rgba(255,255,255,0.08) 25%, transparent 25%),
    linear-gradient(45deg, rgba(0,0,0,0.35) 25%, transparent 25%),
    linear-gradient(135deg, transparent 75%, rgba(0,0,0,0.25) 75%),
    linear-gradient(45deg, rgba(255,255,255,0.04) 25%, transparent 25%);
  background-size: 14px 14px, 14px 14px, 28px 28px, 14px 14px;
  background-position: 0 0, 0 0, 0 0, 0 0;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }

/* Layout: mobile-first, centered hero image with frosted-glass footer card */
main {
  display: grid;
  place-items: center;
  padding: 20px 12px;
  min-height: calc(100vh - 140px);
}
.image-frame {
  width: min(94vw, 860px);
  padding: 14px;
  border-radius: 16px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(0, 255, 255, 0.25);
  box-shadow: 0 15px 50px rgba(0,0,0,0.55);
  display: grid;
  place-items: center;
  backdrop-filter: saturate(1.15) blur(2px);
  -webkit-backdrop-filter: saturate(1.15) blur(2px);
}
.image-frame img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  border: 1px solid rgba(0, 255, 255, 0.25);
  box-shadow: 0 8px 28px rgba(0,0,0,0.6);
  max-width: 100%;
}

/* Frosted glass footer card with CTA */
footer {
  padding: 14px 12px 28px;
  display: grid;
  justify-items: center;
  background: linear-gradient(to top, rgba(0,0,0,0.55), rgba(0,0,0,0.15) 60%);
}
.product-ad {
  width: min(92vw, 520px);
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  box-shadow: 0 8px 28px rgba(0,0,0,0.4);
}
.product-ad h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  color: #b7ffff;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-shadow: 0 0 6px rgba(0,255,255,0.6);
}
.product-ad a {
  display: inline-block;
  padding: 10px 14px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--cyan) 0%, var(--cyan-dark) 100%);
  color: #041018;
  font-weight: 800;
  letter-spacing: .3px;
  text-shadow: 0 1px 0 rgba(255,255,255,0.25);
  box-shadow: 0 6px 16px rgba(0, 229, 255, 0.6);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.product-ad a:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 22px rgba(0, 229, 255, 0.85);
}
.product-ad a:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 2px;
}
.product-ad p {
  margin: 8px 0 0;
  font-weight: 500;
  color: #eaffff;
  font-size: 0.95rem;
}
footer p {
  margin: 12px 0 0;
  font-size: 0.9rem;
  color: #a3c8d6;
  text-align: center;
  opacity: 0.95;
}

/* Focus for keyboard navigation on major interactive elements */
:focus-visible { outline: 3px solid var(--cyan); outline-offset: 2px; }

/* Responsive tweaks */
@media (min-width: 768px) {
  main { min-height: calc(100vh - 180px); padding: 48px; }
  .image-frame { padding: 28px; }
  .image-frame img { max-width: 92%; border-radius: 14px; }
}
@media (min-width: 1024px) {
  footer { padding: 20px 0 40px; }
  .product-ad { width: 520px; }
}