/* Design System: GLASS-FROST */
:root {
  --primary: #52525b;
  --secondary: #fafafa;
  --accent: #0ea5e9;
  --text: #18181b;
  --bg: #ffffff;
}

body {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #ffffff;
  min-height: 100vh;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

/* Glassmorphism Card Style */
.card {
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 16px;
}

.header-glass {
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

/* CTA Button */
.btn {
  border-radius: 12px;
  background: #ffffff;
  color: #764ba2;
  font-weight: 700;
  min-height: 44px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-center;
}

.btn:hover {
  background: #f8f8f8;
  color: #667eea;
}

/* Visually Hidden SR-ONLY class */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Gallery Component */
.gallery-container {
  width: 100%;
}

.gallery-main {
  position: relative;
  width: 100%;
  padding-bottom: 100%; /* Square Aspect Ratio */
  overflow: hidden;
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  z-index: 1;
  transition: opacity 0.3s ease-in-out;
  display: flex;
  align-items: center;
  justify-content: center;
}

.slide img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

/* Gallery Radio Toggle States */
#img-1:checked ~ .gallery-main .slide-1,
#img-2:checked ~ .gallery-main .slide-2,
#img-3:checked ~ .gallery-main .slide-3,
#img-4:checked ~ .gallery-main .slide-4 {
  opacity: 1;
  z-index: 10;
}

/* Active Thumbnail Indicator */
#img-1:checked ~ .thumbnails label[for="img-1"],
#img-2:checked ~ .thumbnails label[for="img-2"],
#img-3:checked ~ .thumbnails label[for="img-3"],
#img-4:checked ~ .thumbnails label[for="img-4"] {
  border-color: #ffffff;
  opacity: 1;
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.5);
}

.thumbnails label {
  opacity: 0.6;
}

.thumbnails label:hover {
  opacity: 0.9;
}