/* Reset & root variables */
*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
:root {
  --bg1: #2b1f11;
  --bg2: #1a0f07;
  --cyan: #00e5ff;
  --cyan2: #00bcd4;
  --glass: rgba(255,255,255,0.14);
  --text: #e8feff;
  --muted: rgba(232,255,255,0.85);
}

/* Base layout - mobile first */
html { font-size: 16px; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto;
  color: var(--text);
  background: linear-gradient(135deg, var(--bg1) 0%, var(--bg2) 60%), 
              radial-gradient(circle at 20% -10%, rgba(0, 230, 230, 0.08) 0 40%, transparent 41%);
  min-height: 100vh;
  background-attachment: fixed;
}

/* Layout wrappers */
main {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2rem 1rem;
  width: 100%;
}

.image-frame {
  width: 100%;
  max-width: 860px;
  border-radius: 18px;
  overflow: hidden;
  background: var(--glass);
  border: 1px solid rgba(0,0,0,.25);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 20px 60px rgba(0,0,0,.45);
}

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

/* Footer / CTA area with frosted glass card */
footer {
  padding: 1.75rem 1rem;
  display: flex;
  justify-content: center;
  width: 100%;
}

.product-ad {
  width: min(92%, 720px);
  padding: 1rem;
  border-radius: 14px;
  background: rgba(9,12,14,0.55);
  border: 1px solid rgba(0,255,255,.35);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  text-align: left;
  color: #eaffff;
  box-shadow: 0 8px 28px rgba(0,0,0,.4);
}

/* Card heading & CTA styling */
.product-ad h3 {
  font-size: 1.15rem;
  margin-bottom: .5rem;
  color: #d8ffff;
  display: flex;
  align-items: center;
  gap: .5rem;
}

.product-ad a {
  display: inline-block;
  padding: .75rem 1.1rem;
  border-radius: 9px;
  color: #041b1f;
  font-weight: 700;
  text-decoration: none;
  background: linear-gradient(135deg, rgba(0,255,255,.85), rgba(0,183,198,.85));
  border: 1px solid rgba(0,255,255,.9);
  transition: transform .15s ease, box-shadow .2s ease;
}
.product-ad a:hover { transform: translateY(-1px); box-shadow: 0 6px 14px rgba(0,0,0,.25); }

/* Focus accessibility for interactive element */
.product-ad a:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 9px;
}

/* Footer copyright line */
footer > p {
  text-align: center;
  margin: 0.75rem 0 0;
  color: rgba(232,255,255,.85);
  font-size: .95rem;
}

/* Small-screen tweaks (mobile-first) */
@media (min-width: 768px) {
  main { padding: 3rem 1.25rem; }
  .image-frame { border-radius: 22px; }
  .product-ad { padding: 1.25rem; }
  footer > p { font-size: 1rem; }
}