:root {
  --cyan: #00e5ff;
  --bg: #021018;
  --glass: rgba(255,255,255,.08);
  --card: rgba(255,255,255,.18);
  --text: #eaffff;
}

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

html, body { height: 100%; margin: 0; padding: 0; }

body {
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.5;
  min-height: 100%;
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(0,0,0,.25), rgba(0,0,0,.25)),
    linear-gradient(0deg, rgba(0,255,255,.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,255,255,.14) 1px, transparent 1px);
  background-size: 60px 60px, 60px 60px, 60px 60px;
  background-position: 0 0, 0 0, 0 0;
  background-blend-mode: overlay;
}

main { padding: 16px 0; display: block; }

.image-frame {
  width: min(92vw, 900px);
  margin: 0 auto;
  padding: 14px;
  border-radius: 14px;
  background: var(--glass);
  border: 1px solid rgba(255,255,255,.25);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  box-shadow: 0 10px 40px rgba(0,0,0,.35);
  display: flex;
  justify-content: center;
  align-items: center;
}

.image-frame img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
}

footer {
  padding: 16px 12px;
  text-align: center;
}

.product-ad {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.25);
  margin: 8px auto;
  min-width: 220px;
}

.product-ad h3 { margin: 0; font-size: 1rem; }

.product-ad a {
  display: inline-block;
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,.3);
  background: rgba(0,0,0,.25);
  transition: transform .2s ease, background .2s ease;
}
.product-ad a:hover { background: rgba(0,0,0,.35); transform: translateY(-1px); }
.product-ad a:focus-visible { outline: 3px solid var(--cyan); outline-offset: 2px; }

footer p { margin: 6px 0 0; color: #d8faff; font-size: 0.92rem; }

@media (min-width: 700px) {
  main { padding: 40px 0; }
  .image-frame { padding: 20px; }
  .product-ad { margin-top: 6px; }
}