/* Corporate-Trust Design System & Custom Overrides */
:root {
  --primary: #1d4ed8;
  --secondary: #eff6ff;
  --accent: #f59e0b;
  --text: #1e293b;
  --bg: #ffffff;
}

body {
  background: #f8fafc;
  color: #1e293b;
}

section {
  padding: 48px 16px;
}

@media (min-width: 768px) {
  section {
    padding: 64px 24px;
  }
}

.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;
}

header {
  border-bottom: 3px solid var(--primary);
}

/* Accessible typography via clamp */
body {
  font-size: clamp(14px, 4vw, 16px);
}

h1 {
  font-size: clamp(20px, 4vw, 28px);
}

h2 {
  font-size: clamp(22px, 5vw, 32px);
}

/* Accessibility: Screen Reader Only 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;
}

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

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

/* Gallery Radio Toggles */
#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;
}

/* Thumbnail Borders on Check */
#img-1:checked ~ .thumbnails label[for="img-1"] {
  border-color: var(--primary);
  opacity: 1;
}

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

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

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

.thumbnails label {
  opacity: 0.6;
}

.thumbnails label:hover {
  opacity: 0.9;
}