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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at top, rgba(247, 213, 122, 0.14), transparent 32%),
    linear-gradient(180deg, #06080f 0%, #0c1220 100%);
  font-family: "Inter", "Segoe UI", Arial, sans-serif;
}

.preview-grid {
  width: min(100%, 1320px);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.preview-shell {
  min-width: 0;
  padding: 14px;
  border: 1px solid rgba(255, 222, 138, 0.18);
  border-radius: 14px;
  background: rgba(11, 14, 27, 0.72);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(16px);
}

.preview-shell iframe {
  display: block;
  width: 100%;
  height: 140px;
  border: 0;
  overflow: hidden;
  border-radius: 10px;
}

@media (max-width: 980px) {
  .preview-grid {
    width: min(100%, 430px);
    grid-template-columns: 1fr;
  }
}