/* Custom CSS Variables */
:root {
  --primary: #166534;
  --secondary: #f0fdf4;
  --accent: #fbbf24;
  --text: #f5f5f5;
  --bg: #0f0f0f;
}

/* Base Styles override with Dark Modern Design System */
body {
  background: var(--bg);
  color: var(--text);
}

section {
  padding: 48px 0;
}

.card {
  background: #1a1a1a;
  border: 1px solid #333;
  border-radius: 12px;
}

.btn {
  border-radius: 8px;
  background: var(--accent);
  color: #0f0f0f;
  font-weight: 700;
}

h1, h2, h3 {
  font-weight: 800;
}

/* Typography Fluid Sizing */
body {
  font-size: clamp(14px, 4vw, 16px);
}

/* Accessible hidden element styling */
.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;
}

/* CSS-Only Gallery Implementation */
.gallery-main {
  position: relative;
  width: 100%;
  padding-bottom: 100%; /* Strict height configuration */
  overflow: hidden;
}

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

/* Checked Radio Inputs State Handling */
#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 Styling */
#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(--accent);
  transform: scale(0.96);
}

/* General Layout Optimization */
img {
  max-width: 100%;
  height: auto;
}

/* Prevent horizontal scroll */
html, body {
  overflow-x: hidden;
}