/* Design System Variables */
:root {
  --primary: #6d28d9;
  --secondary: #ede9fe;
  --accent: #10b981;
  --text: #4c1d95;
  --bg: #fafafa;
}

/* Base resets and Typography */
body {
  background: #fff;
  color: #1a1a1a;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: clamp(14px, 4vw, 16px);
  line-height: 1.5;
}

section {
  padding: 64px 16px;
}

.card {
  border-radius: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
}

h1 {
  font-weight: 800;
  line-height: 1.1;
  font-size: clamp(22px, 5vw, 36px);
}

.btn {
  border-radius: 16px;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Accessibility / Screen Readers 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;
}

/* Responsive Custom CSS Gallery */
.gallery-main {
  position: relative;
  width: 100%;
  padding-bottom: 100%; /* Strict aspect ratio requirement */
  overflow: hidden;
  border-radius: 16px;
  background-color: #f9fafb;
}

.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;
}

/* Slides Visibility Logic based on Checked Radio */
#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 Thumbnails Styling */
.thumbnails label {
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: 8px;
  overflow: hidden;
  transition: border-color 0.2s ease-in-out, transform 0.2s ease-in-out;
}

.thumbnails label:hover {
  transform: scale(1.03);
}

#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);
}