:root {
    /* Theme LIGHT specific colors */
    --eyecare-bg: #FFFFFF;
    --eyecare-surface: #F9FAFB;
    --eyecare-tone: #0284c7;
    --eyecare-tone-hover: #0369a1;
    --eyecare-ink: #111827;
    --eyecare-gradient: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
    
    /* Typography */
    --font-display: 'Playfair Display', serif;
    --font-body: 'Mulish', sans-serif;

    /* Visual Parameters */
    --radius-shape: 16px; /* Soft */
    --shadow-deep: 0 25px 50px -12px rgba(0, 0, 0, 0.25); /* Deep shadow */
}

/* Base Restets */
body {
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

/* Gallery Logic (No JS) */
.visual-frame {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease-in-out, visibility 0.4s ease-in-out;
}
.preview-stage {
    padding-bottom: 100%; /* 1:1 Aspect Ratio */
}
#pic-trig-1:checked ~ .preview-stage .visual-frame-1,
#pic-trig-2:checked ~ .preview-stage .visual-frame-2,
#pic-trig-3:checked ~ .preview-stage .visual-frame-3,
#pic-trig-4:checked ~ .preview-stage .visual-frame-4 {
    opacity: 1;
    visibility: visible;
    z-index: 10;
}

/* Thumbnail Styling (Preset C: bottom, inactive opacity 0.5) */
.thumb-trigger {
    opacity: 0.5;
    transition: opacity 0.3s ease, border-color 0.3s ease;
    border: 2px solid transparent;
}

.thumb-trigger:hover {
    opacity: 0.8;
}

#pic-trig-1:checked ~ .thumb-rack label[for="pic-trig-1"],
#pic-trig-2:checked ~ .thumb-rack label[for="pic-trig-2"],
#pic-trig-3:checked ~ .thumb-rack label[for="pic-trig-3"],
#pic-trig-4:checked ~ .thumb-rack label[for="pic-trig-4"] {
    opacity: 1;
    border-color: var(--eyecare-tone);
}

/* CTA Interaction */
.action-link:hover {
    background-color: var(--eyecare-tone) !important;
    color: #FFFFFF !important;
    border-left-color: var(--eyecare-ink) !important;
    transform: translateY(-2px);
}