/* Clean-White Design System Variables */
:root {
  --primary: #a21caf;
  --secondary: #fdf4ff;
  --accent: #f59e0b;
  --text: #4a044e;
  --bg: #fafafa;
}

/* Base Reset & Typography */
body {
  background: #fff;
  color: #111;
  font-family: 'Inter', sans-serif;
  font-size: clamp(14px, 4vw, 16px);
  line-height: 1.5;
  overflow-x: hidden;
}

section {
  padding: 48px 16px;
}

.card {
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  box-shadow: none;
}

.btn {
  border-radius: 6px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

h1, h2 {
  font-weight: 700;
}

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

h2 {
  font-size: clamp(20px, 4.5vw, 28px);
}

/* 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;
}

/* Mobile-First CSS Gallery */
.gallery-container {
  width: 100%;
}

.gallery-main {
  position: relative;
  width: 100%;
  padding-bottom: 100%; /* Strict height constraint */
  overflow: hidden;
  border-radius: 8px;
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  z-index: 1;
  transition: opacity 0.30s ease-in-out;
}

.thumbnails {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-top: 12px;
}

.thumbnails label {
  aspect-ratio: 1 / 1;
  border: 2px solid transparent;
  border-radius: 4px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.thumbnails label img {
  width: 100%;
  height: 100%;
  object-cover: cover;
}

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

#img-1:checked ~ .thumbnails label[for="img-1"] { border-color: var(--primary); }
#img-2:checked ~ .thumbnails label[for="img-2"] { border-color: var(--primary); }
#img-3:checked ~ .thumbnails label[for="img-3"] { border-color: var(--primary); }
#img-4:checked ~ .thumbnails label[for="img-4"] { border-color: var(--primary); }

/* Prevent any potential horizontal scroll */
html, body {
  max-width: 100%;
  overflow-x: hidden;
}