/* Section: Base & Tokens */
:root {
  --bg: #0a0a14;
  --bg-2: #150b2a;
  --bg-3: #0b0e2b;
  --text: #f5f3ff;
  --muted: #c9c2e6;
  --accent: #ffd400;       /* cyber yellow */
  --accent-2: #7c3cff;      /* violet */
  --glass: rgba(255, 255, 255, 0.08);
  --glass-2: rgba(255, 255, 255, 0.14);
  --border: rgba(255, 255, 255, 0.25);
  --shadow: 0 10px 28px rgba(0,0,0,.45);
  --radius: 14px;
  --focus: 2px solid var(--accent-2);
}

html, body { height: 100%; }
* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
               Arial, "Noto Sans", "Liberation Sans", sans-serif;
  line-height: 1.5;
  background:
    /* gradient backdrop with violet/cyber glow */
    linear-gradient(135deg, rgba(12,0,40,.85) 0%, rgba(12,0,40,.65) 40%, rgba(8,0,22,.85) 100%),
    /* cyber yellow city-light bokeh hints */
    radial-gradient(circle at 20% 30%, rgba(255,212,0,.25) 0, transparent 40%),
    radial-gradient(circle at 70% 60%, rgba(124,58,237,.25) 0, transparent 40%),
    /* subtle scanlines (noise) */
    repeating-linear-gradient(to bottom, rgba(255,255,255,.04) 0 1px, transparent 1px 2px);
  background-color: #060613;
  color-scheme: dark;
  -webkit-tap-highlight-color: transparent;
  overflow-x: hidden;
}

@media (prefers-color-scheme: light) {
  html, body { color: #111; }
}

/* Section: Layout helpers */
.container { width: 100%; padding-inline: 1rem; margin-inline: auto; max-width: clamp(720px, 90vw, 1100px); }

/* Section: Glass card utility (fallback supported) */
.glass {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
@supports not (backdrop-filter: blur(10px)) {
  .glass { background: rgba(255,255,255,.18); }
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}
.card {
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.25);
  border-radius: 12px;
  padding: .75rem;
}

/* Section: Typography scale (mobile-first, fluid) */
h1, h2, h3 { margin: .25rem 0; font-weight: 700; line-height: 1.25; }
h1 { font-size: clamp(1.6rem, 2.2vw + 1rem, 2.4rem); letter-spacing: .5px; }
h2 { font-size: clamp(1.25rem, 1.6vw + .8rem, 2rem); }
h3 { font-size: clamp(1.05rem, 1.2vw + .6rem, 1.4rem); color: #fff; }

p { font-size: clamp(0.92rem, 1.4vw, 1.05rem); margin: .6rem 0 1rem; color: var(--text); }
ul { margin: .5rem 0 1rem 1.15rem; padding: 0; }
li { margin: .25rem 0; }

/* Section: Image frame (frame + glow) */
.image-frame {
  width: 100%;
  aspect-ratio: 16/9;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,.28);
  box-shadow: 0 8px 20px rgba(0,0,0,.4);
  background: #000;
}
.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(1.05);
  transform: scale(1.01);
}
@media (hover: hover) {
  .image-frame:hover { transform: scale(1.01); transition: transform .25s ease; }
}

/* Section: Links & actions (a, button, .btn, .cta) */
a, button, .btn, .cta {
  text-decoration: none;
  color: var(--text);
  transition: color .2s ease, background .2s ease, transform .15s ease;
}
a:hover { text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible, button:focus-visible, .btn:focus-visible, .cta:focus-visible {
  outline: var(--focus);
  outline-offset: 2px;
}
.btn, .cta {
  display: inline-flex; align-items: center; justify-content: center;
  padding: .6rem 1rem; border-radius: 999px; border: 1px solid rgba(255,255,255,.25);
  background: linear-gradient(135deg, rgba(124,58,237,.9), rgba(255,212,0,.9));
  color: #0b0a17; font-weight: 700; cursor: pointer;
}
.btn.secondary {
  background: rgba(255,255,255,.15);
  color: var(--text);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); filter: brightness(.95); }

/* Section: the header, nav, main, article, aside, footer basics */
html > body, header, nav, main, article, aside, footer {
  --t: 1;
}
header {
  padding: 1rem 1rem 0.5rem;
  text-align: center;
}
header h1 { margin: .25rem 0 .25rem; font-weight: 800; letter-spacing: .2px; }
header .meta { color: var(--muted); font-size: .85rem; margin-top: .25rem; }

/* Nav styling with glassy feel */
nav {
  margin-top: .5rem;
}
nav a {
  padding: .35rem .6rem;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,.25);
  background: rgba(0,0,0,.15);
  color: var(--text);
}
nav a:hover { background: rgba(255,255,255,.08); text-decoration: underline; }

/* Main & Article layout */
main { padding: 1rem; }
article { display: block; }

/* Section: content area inside article (generic glass panel) */
.content { padding: .75rem; }

/* Section: footer with product ads (grid-like feel) */
footer {
  padding: 1rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: .75rem;
  justify-items: center;
}
footer .product-ad a,
footer .sponsored-page a {
  display: block;
  text-align: center;
  padding: .9rem;
  width: 100%;
  border-radius: 12px;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.25);
  text-decoration: none;
}
footer p { margin: .5rem 0 0; color: var(--muted); }

/* Footer responsive columns (3-up on wide) */
@media (min-width: 900px) {
  footer { grid-template-columns: repeat(3, 1fr); align-items: stretch; }
  .product-ad, .sponsored-page { align-self: stretch; }
}

/* Section: accessibility & print */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}
@media print {
  body { background: #fff; color: #000; }
  a { text-decoration: underline; }
  header, nav, main, footer { page-break-after: avoid; }
}
```