:root {
  --bg-a: #4b2a18;
  --bg-b: #2b1b0f;
  --bg-c: #1b0f07;
  --blue: #4ea8ff;
  --blue-dark: #0b4c8a;
  --glass: rgba(255,255,255,.08);
  --border: rgba(255,255,255,.28);
  --text: #e9f4ff;
  --muted: rgba(233,246,255,.75);
  --shadow: 0 8px 28px rgba(0,0,0,.25);
}

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

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial;
  color: var(--text);
  background: linear-gradient(135deg, var(--bg-a) 0%, var(--bg-b) 40%, var(--bg-c) 100%);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

header {
  padding: 2rem 1rem;
  text-align: center;
  border-bottom: 1px solid rgba(255,255,255,.08);
}

header h1 {
  font-size: clamp(1.75rem, 5vw, 3rem);
  margin: 0;
  font-weight: 800;
  letter-spacing: .5px;
  color: #e8f4ff;
  text-shadow: 0 0 8px rgba(78,167,255,.8);
}

main {
  padding: 0 1rem;
  display: block;
}

.image-frame {
  max-width: 860px;
  margin: 1.25rem auto;
  border-radius: 16px;
  padding: 0.75rem;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.25);
  backdrop-filter: saturate(120%) blur(6px);
  -webkit-backdrop-filter: saturate(120%) blur(6px);
  box-shadow: var(--shadow);
}

.image-frame img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  border: 1px solid rgba(255,255,255,.25);
}

footer {
  padding: 1rem;
  display: grid;
  gap: 1rem;
  justify-items: center;
  margin-top: 1rem;
}

.product-ad {
  width: min(92%, 700px);
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(255,255,255,.08);
  backdrop-filter: blur(6px) saturate(120%);
  -webkit-backdrop-filter: blur(6px) saturate(120%);
  box-shadow: 0 8px 28px rgba(0,0,0,.25);
  text-align: center;
}

.product-ad h3 {
  color: #c6f0ff;
  font-size: 1.05rem;
  margin: 0 0 6px;
  text-shadow: 0 0 6px rgba(70,170,255,.8);
}

.product-ad a {
  display: inline-block;
  text-decoration: none;
  padding: 10px 14px;
  border-radius: 10px;
  background: linear-gradient(135deg, #0b2a6b 0%, #0b1b3e 100%);
  color: #e9f5ff;
  border: 1px solid rgba(160,210,255,.6);
  transition: transform .2s ease, box-shadow .2s ease;
}
.product-ad a:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 14px rgba(0,0,0,.4);
}
.product-ad a:focus-visible {
  outline: 2px solid #66e0ff;
  outline-offset: 2px;
}

footer p {
  color: rgba(230,240,255,.8);
  font-size: .9rem;
  text-align: center;
  margin: 0;
}

@media (min-width: 600px) {
  main { padding: 0 2rem; }
  .image-frame { margin-top: 1.75rem; }
  .product-ad { padding: 18px 20px; }
  .product-ad h3 { font-size: 1.15rem; }
}

@media (min-width: 900px) {
  header { padding: 3rem 0; }
  header h1 { font-size: clamp(2rem, 3vw + 1rem, 3.5rem); }
  main { padding: 0 6rem; }
  .image-frame { max-width: 980px; }
  footer { grid-auto-flow: row; gap: 1.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}