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

html, body {
  height: 100%;
}

:root {
  --green: #39ff87;
  --green-dark: #0aff6a;
  --violet: #6a00ff;
  --bg: #210033;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto;
  color: #eafff3;
  background-color: var(--bg);
  /* violet carbon fiber background */
  background-image:
    linear-gradient(135deg, rgba(0,0,0,.25) 25%, transparent 25%),
    linear-gradient(225deg, rgba(0,0,0,.18) 25%, transparent 25%),
    linear-gradient(315deg, rgba(0,0,0,.18) 25%, transparent 25%),
    linear-gradient(45deg, rgba(0,0,0,.25) 25%, transparent 25%),
    linear-gradient(to bottom right, rgba(160,0,150,.35), rgba(0,0,0,0.3));
  background-size: 20px 20px;
  background-position: 0 0, 10px 0, 0 10px, 10px 10px, 0 0;
  background-blend-mode: overlay;
  min-height: 100%;
  text-rendering: optimizeLegibility;
}

main {
  min-height: 60vh;
  display: grid;
  place-items: center;
  padding: 2rem;
}

.image-frame {
  width: min(92%, 720px);
  aspect-ratio: 16 / 9;
  border-radius: 16px;
  overflow: hidden;
  position: relative;
  background: rgba(10, 0, 20, 0.4);
  border: 1px solid rgba(0, 255, 150, 0.35);
  box-shadow: 0 20px 50px rgba(0,0,0,.5);
  backdrop-filter: blur(6px) saturate(120%);
  -webkit-backdrop-filter: blur(6px) saturate(120%);
  display: grid;
  align-items: center;
  justify-items: center;
  isolation: isolate;
}
.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(1.15);
  mix-blend-mode: screen;
}

footer {
  padding: 2rem;
  text-align: center;
  color: #d3ffd8;
  background: rgba(10,0,20,0.25);
}
.product-ad {
  display: inline-block;
  padding: .6rem;
  border-radius: 10px;
  margin-bottom: .75rem;
  background: rgba(0,0,0,0.25);
  border: 1px solid rgba(0,255,150,.35);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}
.product-ad h3 { font-size: 1rem; margin: 0 .5rem 0.5rem; }
.product-ad a {
  display: inline-block;
  padding: .65rem 1rem;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 700;
  color: #041c08;
  background: linear-gradient(135deg, #00ff86 0%, #00d46f 100%);
  box-shadow: 0 6px 14px rgba(0, 255, 130, 0.6);
}
.product-ad a:focus-visible {
  outline: 2px solid #9cff9c;
  outline-offset: 2px;
}
a, a:visited { color: var(--green); text-decoration: none; }
a:hover { text-decoration: underline; }
p { margin: 0; }

/* high-contrast focus for keyboard nav on all focusable elements */
:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 2px;
  border-radius: 4px;
}

/* responsive */
@media (min-width: 768px) {
  main { padding: 3rem; }
  .image-frame { width: min(64vw, 780px); border-radius: 22px; }
  .product-ad { padding: 1rem; }
  .product-ad h3 { font-size: 1.05rem; }
}