:root {
    /* Theme: HEALTH (clean, fresh, soft blues/greens) */
    --soothexp-bg: #FFFFFF;
    --soothexp-surface: #F2F9F8;
    --soothexp-accent: #118C7E;
    --soothexp-ink: #1C332F;
    --soothexp-border: #D1E5E1;
    
    /* Typography */
    --font-heading: 'Merriweather', serif;
    --font-body: 'Mulish', sans-serif;
    
    /* Shape Parameters */
    --soothexp-radius-sharp: 3px;
    --soothexp-radius-pill: 999px;
}

/* Reset & Foundation */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-body);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    text-transform: uppercase;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Preset A Modifications */
.ocular-top-banner {
    border-bottom: 4px solid var(--soothexp-accent);
}

.purchase-trigger-pill {
    border-radius: var(--soothexp-radius-pill);
    transition: all 0.3s ease;
    box-shadow: none; /* Flat initial */
    text-decoration: none;
}

.purchase-trigger-pill:hover {
    box-shadow: 0 10px 25px rgba(17, 140, 126, 0.3);
}

.buyer-note-row {
    border-left: 4px solid var(--soothexp-accent);
    border-radius: var(--soothexp-radius-sharp);
}

/* General structural elements geometry */
.main-lens-display,
.thumb-trigger,
.buyer-note-row img:not(.rounded-full) {
    border-radius: var(--soothexp-radius-sharp);
}

/* Gallery CSS Engine */
.gallery-engine-core {
    position: relative;
    width: 100%;
    display: flex;
    flex-direction: column;
}

.hidden-trigger {
    display: none;
}

.main-lens-display {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1;
    overflow: hidden;
    border: 1px solid var(--soothexp-border);
}

.lens-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease-in-out;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
}

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

/* Radio Checked Logic for Main Image */
#sv-1:checked ~ .main-lens-display .lens-1,
#sv-2:checked ~ .main-lens-display .lens-2,
#sv-3:checked ~ .main-lens-display .lens-3,
#sv-4:checked ~ .main-lens-display .lens-4 {
    opacity: 1;
    visibility: visible;
}

/* Thumbnails */
.thumb-selector-row {
    scrollbar-width: thin;
    scrollbar-color: var(--soothexp-border) transparent;
}

.thumb-selector-row::-webkit-scrollbar {
    height: 6px;
}

.thumb-selector-row::-webkit-scrollbar-thumb {
    background-color: var(--soothexp-border);
    border-radius: var(--soothexp-radius-sharp);
}

.thumb-trigger {
    cursor: pointer;
    width: 80px;
    height: 80px;
    flex-shrink: 0;
    border: 2px solid transparent;
    overflow: hidden;
    transition: border-color 0.2s ease;
    opacity: 0.7;
}

.thumb-trigger:hover {
    opacity: 1;
}

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

/* Radio Checked Logic for Thumbnails */
#sv-1:checked ~ .thumb-selector-row label[for="sv-1"],
#sv-2:checked ~ .thumb-selector-row label[for="sv-2"],
#sv-3:checked ~ .thumb-selector-row label[for="sv-3"],
#sv-4:checked ~ .thumb-selector-row label[for="sv-4"] {
    border-color: var(--soothexp-accent) !important;
    opacity: 1;
}

/* Responsive tuning */
@media (max-width: 768px) {
    .relief-showcase-split {
        flex-direction: column;
    }
    
    .buyer-note-row {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .note-content-col .flex {
        justify-content: center;
    }
}