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

html, body { height: 100%; }

:root {
  --bg1: #0a2d12;
  --bg2: #0f6a4b;
  --bg3: #00b8d8;
  --card: rgba(255,255,255,.08);
  --text: #eaffff;
  --accent: #00e5ff;
  --focus: 0 0 0 3px rgba(0,255,255,.6);
  --shadow: 0 10px 28px rgba(0,0,0,.25);
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial;
  color: var(--text);
  line-height: 1.4;
  background: linear-gradient(135deg, var(--bg1) 0%, var(--bg2) 60%, var(--bg3) 100%);
  min-height: 100%;
  background-attachment: fixed;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  display: grid;
  place-items: center;
  padding: 4rem 1rem;
  min-height: 60vh;
}

.image-frame {
  width: min(92vw, 680px);
  aspect-ratio: 16 / 9;
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid rgba(0, 255, 255, 0.55);
  background: rgba(255,255,255,.08);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  position: relative;
  box-shadow: 0 8px 40px rgba(0,0,0,.4), 0 0 60px rgba(0,255,255,.25);
}
.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(1.05);
}
.image-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: inset 0 0 80px rgba(0,255,255,.25);
  pointer-events: none;
}
@media (min-width: 768px) {
  main { padding: 6rem 2rem; }
  .image-frame { width: min(720px, 70vw); }
}

footer {
  padding: 1.25rem 1rem;
  text-align: center;
  color: var(--text);
}
.product-ad {
  width: min(92vw, 720px);
  margin: 0.75rem auto 1rem;
  padding: .9rem 1rem;
  border-radius: 14px;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(0,255,255,.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  text-align: left;
}
.product-ad h3 {
  margin: 0 0 .25rem;
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .2px;
}
.product-ad a {
  display: inline-block;
  margin-top: .25rem;
  padding: .55rem 1rem;
  border-radius: 999px;
  background: rgba(0, 230, 255, .28);
  color: #021b12;
  text-decoration: none;
  border: 1px solid rgba(0, 230, 255, 0.6);
  font-weight: 600;
  transition: transform .2s ease, background .2s ease;
}
.product-ad a:hover {
  transform: translateY(-1px);
  background: rgba(0, 230, 255, .38);
}
.product-ad a:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}
footer p {
  margin: .75rem 0 0;
  font-size: .85rem;
  opacity: .9;
}
a:focus-visible {
  outline: none;
  box-shadow: var(--focus);
}