/* Corporate Trust Design System Colors */
:root {
  --primary: #4d7c0f;
  --secondary: #f7fee7;
  --accent: #0ea5e9;
  --text: #1a2e05;
  --bg: #fefefe;
}

/* Base Typography & Layout */
body {
  font-family: 'Inter', sans-serif;
  background-color: #f8fafc;
  color: #1e293b;
  font-size: clamp(14px, 4vw, 16px);
  margin: 0;
  padding: 0;
}

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

section {
  padding: 64px 16px;
}

.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;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

header {
  border-bottom: 3px solid var(--primary, #2563eb);
}

/* Accessibility */
.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 Interactive Gallery */
.gallery-main {
  position: relative;
  width: 100%;
  padding-bottom: 100%; /* Keeps aspect ratio square without aspect-square class */
  overflow: hidden;
}

.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;
}

/* Thumbnail Styling */
.thumbnails {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.thumbnails label {
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: 4px;
  overflow: hidden;
  width: 25%;
  transition: border-color 0.2s ease;
}

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

/* Gallery 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;
}

/* Active Thumbnail States */
#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);
}