/* Reset & base */
*, *::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, Arial;
  color: #e9e9ff;
  background: #0a0f1a;
  line-height: 1.4;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
  overflow-x: hidden;
}
:focus { outline: none; }

/* Silver neon glow background with violet cyberpunk vibe */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 20% 15%, rgba(170,180,255,.25), transparent 40%),
    radial-gradient(circle at 80% 40%, rgba(0,255,230,.20), transparent 40%),
    linear-gradient(135deg, rgba(9,9,20,.95), rgba(9,9,20,.92));
  filter: saturate(120%);
  animation: glow 14s linear infinite;
}
@keyframes glow {
  0% { filter: saturate(125%) hue-rotate(0deg); }
  100% { filter: saturate(125%) hue-rotate(20deg); }
}

/* Layout: mobile-first hero */
main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(16px, 5vw, 40px);
  min-height: calc(100vh - 140px);
  width: 100%;
  position: relative;
  z-index: 0;
}

/* Frosted glass image frame (hero card) */
.image-frame {
  width: min(92vw, 720px);
  aspect-ratio: 16 / 9;
  border-radius: 20px;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(170,170,255,.40);
  backdrop-filter: blur(8px) saturate(120%);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 8px 40px rgba(0,0,0,.6), 0 0 18px rgba(120,0,255,.55);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(1.05);
}

/* Footer & ad section */
footer {
  padding: 20px;
  text-align: center;
  color: #d9d9ff;
  background: linear-gradient(to top, rgba(9,9,18,.9), rgba(9,9,18,.6));
  border-top: 1px solid rgba(120,0,255,.4);
}

.product-ad {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  margin: 0 auto 8px;
  border-radius: 16px;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(170,170,255,.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  box-shadow: 0 6px 18px rgba(0,0,0,.5), inset 0 0 12px rgba(120,0,255,.6);
}
.product-ad h3 {
  font-size: 1rem;
  margin: 0;
  color: #e9e9ff;
  display: flex;
  align-items: center;
  gap: 6px;
}
.product-ad a {
  text-decoration: none;
  display: inline-block;
  padding: 12px 20px;
  border-radius: 999px;
  background: linear-gradient(135deg, #00ffd5 0%, #7a00ff 100%);
  color: #04121a;
  font-weight: 700;
  border: 1px solid rgba(255,255,255,.6);
  box-shadow: 0 6px 20px rgba(0,0,0,.6), 0 0 12px rgba(0,255,213,.9);
  transition: transform .15s ease-in-out, box-shadow .2s ease-in-out;
}
.product-ad a:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(0,0,0,.6), 0 0 14px rgba(0,255,213,.95);
}
.product-ad a:focus-visible {
  outline: 2px solid #7dfcff;
  outline-offset: 2px;
}
footer p {
  font-size: .85rem;
  margin: 8px 0 0;
  color: #c9c9e6;
}

/* Accessibility for focus */
a:focus-visible, button:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid #7dfcff;
  outline-offset: 2px;
  border-radius: 6px;
}

/* Responsive tweaks */
@media (min-width: 600px) {
  main { padding: 3rem; min-height: calc(100vh - 140px); }
  .product-ad h3 { font-size: 1.05rem; }
}
@media (min-width: 1024px) {
  main { padding: 4rem; }
  .image-frame { border-radius: 28px; width: min(720px, 60vw); }
  footer { padding: 28px; }
}