:root {
  --primary: #0891b2;
  --secondary: #ecfeff;
  --accent: #f97316;
  --text: #164e63;
  --bg: #fafafa;
}

body {
  background: #f8fafc;
  color: #1e293b;
  font-family: 'Inter', sans-serif;
  font-size: clamp(14px, 4vw, 16px);
}

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

section {
  padding: 40px 16px;
}

@media (min-width: 768px) {
  section {
    padding: 64px 16px;
  }
}

.card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.btn {
  border-radius: 6px;
  font-weight: 600;
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease-in-out;
}

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

/* GALLERY SYSTEM */
.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-container {
  width: 100%;
}

.gallery-main {
  position: relative;
  width: 100%;
  padding-bottom: 100%;
  overflow: hidden;
  border-radius: 8px;
  border: 1px solid #e2e8f0;
  background-color: #fff;
}

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

.thumbnails label {
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: 6px;
  overflow: hidden;
  aspect-ratio: 1;
  display: block;
  transition: border-color 0.2s ease-in-out;
}

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

/* Gallery Radio Selectors */
#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); }