/* Base */
:root{
  --bg: #071015;
  --bg-2: #0b141a;
  --text: #eaffff;
  --muted: #a7f5f0;
  --accent: #1ee6d4;      /* turquoise/cyan */
  --accent-2: #ff2bd6;     /* magenta */
  --card: rgba(255,255,255,.08);
  --card-border: rgba(255,255,255,.25);
  --shadow: 0 8px 28px rgba(0,0,0,.45);
  --radius: 14px;
}
@media (prefers-color-scheme: light){
  :root{
    --bg: #f6fbff;
    --bg-2: #eef6fb;
    --text: #0b1b24;
    --muted: #2a556d;
    --accent: #0e6b7b;
    --accent-2: #b400a6;
  }
}
html, body {
  height: 100%;
}
html, body, header, nav, main, article, footer, aside {
  box-sizing: border-box;
}
html, body {
  margin: 0;
  color: var(--text);
  background: linear-gradient(135deg, #0b1a1f 0%, #09131a 60%, #04070b 100%);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  position: relative;
}
body::before{
  content:"";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  /* Layered background: gradient + subtle scanlines/noise (pure CSS) */
  background:
    radial-gradient(circle at 20% 0%, rgba(0,0,0,.25) 0%, rgba(0,0,0,0) 40%),
    linear-gradient(135deg, rgba(0,0,0,.25) 0%, rgba(0,0,0,0) 60%),
    repeating-linear-gradient(to bottom, rgba(0,255,230,.04) 0 1px, transparent 1px 2px);
  mix-blend-mode: overlay;
  filter: saturate(1.05);
}
.container{ width: min(92%, 1100px); margin: 0 auto; padding: 0 0.5rem; }
.grid{ display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.card{ background: var(--card); border: 1px solid var(--card-border); border-radius: 12px; padding: 1rem; box-shadow: var(--shadow); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
.glass { background: rgba(8, 255, 240, 0.08); border: 1px solid rgba(255,255,255,.25); border-radius: 12px; padding: 1rem; backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); box-shadow: 0 6px 20px rgba(0,0,0,.4); }

/* Layout sections */
header{ padding: 2rem 0; text-align: center; }
header h1{ margin:0; font-size: clamp(1.75rem, 2.5vw + 1rem, 3rem); letter-spacing:.5px; text-shadow: 0 2px 6px rgba(0,0,0,.4); }
main{ padding: 1rem 0 2rem; display:flex; justify-content:center; }
article{ width: 100%; display:flex; justify-content:center; }

/* Image frame styling */
.image-frame{ width: min(90%, 720px); aspect-ratio: 16 / 9; overflow: hidden; border-radius: 16px; border: 1px solid rgba(255,255,255,.25); background: rgba(0,0,0,.25); box-shadow: 0 20px 40px rgba(0,0,0,.5); }
.image-frame img{ width:100%; height:100%; object-fit: cover; display:block; }

/* Content utility classes used by the page structure */
.content{ padding: .5rem; color: var(--muted); }

/* Product ad / sponsored sections in footer */
.product-ad, .sponsored-page{ display:block; text-align:center; margin: .25rem 0; }
.product-ad a, .sponsored-page a{ display:inline-flex; align-items:center; justify-content:center; padding:.75rem 1rem; border-radius: 999px; text-decoration: none; font-weight: 600; }
.product-ad{ background: rgba(0,0,0,.25); border:1px solid rgba(255,255,255,.25); }
.sponsored-page{ background: rgba(0,0,0,.18); border:1px solid rgba(255,255,255,.25); }

/* Link, button, .btn, .cta styling */
a, button, .btn, .cta{ transition: color .2s ease, background-color .2s ease, transform .15s ease; text-decoration: none; border: none; outline: none; font: inherit; color: var(--text); cursor: pointer; border-radius: 8px; }
a{ color: var(--accent); text-decoration: none; }
a:hover{ text-decoration: underline; color: var(--accent-2); }
a:focus-visible, button:focus-visible{ outline: 2px solid var(--accent); outline-offset: 2px; }

/* Button variants */
.btn{ display:inline-flex; align-items:center; justify-content:center; padding: .65em 1.05em; gap:.5em; background: var(--accent-2); color: #0b0b0b; font-weight: 700; border: 1px solid rgba(0,0,0,.25); }
.btn:hover{ transform: translateY(-1px); }
.btn:active{ transform: scale(0.98); }
.btn--outline{ background: transparent; color: var(--text); border:1px solid rgba(255,255,255,.6); }
.cta{ display:inline-flex; align-items:center; justify-content:center; padding:.6em 1em; }

/* Typography */
h1, h2, h3{ line-height: 1.2; margin: 0 0 .5em; }
p{ margin: 0 0 1rem; color: var(--muted); }
ul{ margin: .5em 0 1em 1.25em; }

/* Focus visibility for accessibility on interactive elements within the page */
:focus-visible{ outline: 2px solid var(--accent); outline-offset: 3px; }

/* Image frame glow for depth on focus/hover (subtle, GPU-friendly) */
.image-frame:focus-within{ box-shadow: 0 0 0 3px rgba(30,230,212,.25); }

/* Print-friendly */
@media print{
  body{ background: #fff; color: #000; }
  a{ color: #000; text-decoration: underline; }
  .glass, .card{ background: #fff; border: 1px solid #ddd; box-shadow: none; }
}
@media (prefers-reduced-motion: reduce){
  *{ animation: none !important; transition: none !important; }
}
@media (min-width: 0){
  /* Ensure a basic responsive typographic scale via clamp is used for body text size */
  body{ font-size: clamp(14px, 1.6vw, 16px); }
}
footer{ padding: 2rem 0; text-align: center; color: var(--muted); }

/* Specific element targeting for the provided HTML structure */
html, body, header, nav, main, article, footer, aside { /* presentational reset hooks if needed in future */ }
```