:root {
  --bg: #06172b;
  --navy: #0b1a32;
  --blue: #1e90ff;
  --blue-dark: #0f4ba6;
  --glass: rgba(255, 255, 255, 0.08);
  --glass-stroke: rgba(180, 210, 255, 0.45);
  --text: #e9f2ff;
  --muted: #b6ccff;
  --shadow: 0 12px 40px rgba(0,0,0,.6);
}
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system;
  color: var(--text);
  background-color: var(--navy);
  /* navy zigzag background */
  background-image:
    linear-gradient(135deg, rgba(255,255,255,.08) 25%, transparent 25%),
    linear-gradient(225deg, rgba(255,255,255,.08) 25%, transparent 25%),
    linear-gradient(315deg, rgba(255,255,255,.08) 25%, transparent 25%),
    linear-gradient(45deg, rgba(255,255,255,.08) 25%, transparent 25%);
  background-size: 40px 40px;
  background-position: 0 0, 0 0, 0 0, 0 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
main {
  display: grid;
  place-items: center;
  padding: 4rem 1rem;
  min-height: calc(100vh - 120px);
}
.image-frame {
  width: min(92vw, 720px);
  aspect-ratio: 16 / 9;
  border-radius: 20px;
  overflow: hidden;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(180,210,255,.6);
  backdrop-filter: blur(8px) saturate(110%);
  -webkit-backdrop-filter: blur(8px) saturate(110%);
  box-shadow: var(--shadow);
}
.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
footer {
  padding: 1.75rem 1rem;
  text-align: center;
  color: var(--muted);
  background: rgba(2,6,23,.6);
  border-top: 1px solid rgba(120,190,255,.25);
}
.product-ad {
  display: inline-block;
  padding: .75rem 1rem;
  border-radius: 14px;
  background: rgba(8,12,28,.66);
  border: 1px solid rgba(70,140,255,.5);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  box-shadow: 0 6px 20px rgba(0,0,0,.4);
  margin-bottom: .75rem;
}
.product-ad h3 {
  font-size: .95rem;
  margin: 0 0 .35rem;
  color: #cfe4ff;
}
.product-ad a {
  text-decoration: none;
  display: inline-block;
  padding: .65rem 1rem;
  border-radius: 999px;
  background: linear-gradient(135deg, #0b2a6b 0%, #0b4aba 100%);
  color: #eaffff;
  border: 1px solid rgba(120,200,255,.95);
  box-shadow: 0 0 14px rgba(60,180,255,.9);
}
.product-ad a:hover { filter: brightness(1.05); }
.product-ad a:focus-visible {
  outline: 3px solid #a9e3ff;
  outline-offset: 2px;
}
.product-ad a p { margin: 0; padding: 0; }

@media (min-width: 600px) {
  main { padding: 6rem 2rem; }
  .image-frame { width: min(86vw, 780px); }
  footer { padding: 2rem 2rem; }
}
@media (min-width: 1024px) {
  main { padding: 8rem 4rem; }
  .image-frame { width: 800px; }
}