:root {
  --primary: #e11d48;
  --secondary: #fff1f2;
  --accent: #0ea5e9;
  --text: #4c0519;
  --bg: #ffffff;
}

body {
  background: #f8fafc;
  color: #1e293b;
  font-family: 'Inter', sans-serif;
  font-size: clamp(14px, 4vw, 16px);
}

section {
  padding: 32px 16px;
}

@media (min-width: 768px) {
  section {
    padding: 64px 16px;
  }
}

.card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.btn {
  border-radius: 6px;
  font-weight: 600;
  min-height: 44px;
}

header {
  border-bottom: 3px solid var(--primary, #2563eb);
}

h1 {
  font-size: clamp(22px, 5vw, 36px);
}

/* Accessibility Utility */
.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 Rules */
.gallery-main {
  position: relative;
  width: 100%;
  padding-bottom: 100%;
  overflow: hidden;
  border-radius: 8px;
  background-color: #f1f5f9;
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  z-index: 1;
  transition: opacity 0.3s ease-in-out;
}

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

/* Active slide selection via checked 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;
}

/* Thumbnail Styling */
.thumbnails label {
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: 6px;
  overflow: hidden;
  opacity: 0.6;
  transition: all 0.2s ease-in-out;
}

.thumbnails label:hover {
  opacity: 1;
}

/* Active thumbnail visual 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: var(--primary);
  opacity: 1;
}