/* Design System - VIBRANT-FRESH */
:root {
  --primary: #dc2626;
  --secondary: #fef2f2;
  --accent: #2563eb;
  --text: #450a0a;
  --bg: #ffffff;
}

body {
  background: var(--bg);
  color: #1a1a1a;
}

section {
  padding: 40px 16px;
}

@media (min-width: 768px) {
  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;
}

.btn {
  border-radius: 16px;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  min-height: 44px;
}

/* Responsive Typography using clamp */
h1 {
  font-size: clamp(20px, 5vw, 28px);
}

h2 {
  font-size: clamp(22px, 5vw, 36px);
}

p, span, label, a, li {
  font-size: clamp(14px, 4vw, 16px);
}

/* Gallery Engine Rules (Strictly CSS Only) */
.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-main {
  position: relative;
  width: 100%;
  padding-bottom: 100%; /* Perfect Square Ratio */
  overflow: hidden;
}

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

.thumbnails {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 16px;
}

/* Active slide selection */
#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;
}

/* Active thumbnail visual styling */
#img-1:checked ~ .thumbnails label[for="img-1"] {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.2);
}
#img-2:checked ~ .thumbnails label[for="img-2"] {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.2);
}
#img-3:checked ~ .thumbnails label[for="img-3"] {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.2);
}
#img-4:checked ~ .thumbnails label[for="img-4"] {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(220, 38, 38, 0.2);
}

/* Image scaling rules */
img {
  max-width: 100%;
  height: auto;
}