:root {
    /* HEALTH Theme: Fresh, clean, soft blues/greens */
    --lemonade-canvas: #f0fdf4; /* Light fresh green backdrop */
    --lemonade-surface: #ffffff; /* Clean white for blocks */
    --lemonade-core: #16a34a; /* Vibrant health green */
    --lemonade-core-hover: #15803d; /* Darker green for interaction */
    --lemonade-ink: #14532d; /* Dark green text for readability */
    --lemonade-cloud: #dcfce7; /* Soft border color */
    
    /* Design Variables */
    --lemonade-shadow: 0 10px 25px -5px rgba(22, 163, 74, 0.15), 0 8px 10px -6px rgba(22, 163, 74, 0.15); /* Raised */
    --lemonade-radius: 16px; /* Soft (12-20px) */
    
    --font-display: 'Nunito', sans-serif;
    --font-body: 'Mulish', sans-serif;
}

/* Base resets & typography */
html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    overflow-x: hidden;
}

/* Preset C: Header Large Logo Letter */
.hydration-letter-mark {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 700;
    color: var(--lemonade-core);
    line-height: 1;
    background: var(--lemonade-cloud);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    margin-bottom: 0.5rem;
}

/* Preset C: CTA Button */
.hydration-action-trigger {
    border-left: 6px solid var(--lemonade-core);
    border-radius: 8px; /* Slightly sharp but safe base */
    box-shadow: var(--lemonade-shadow);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.hydration-action-trigger:hover {
    background-color: var(--lemonade-cloud) !important;
    transform: translateY(-2px);
    transition: all 0.3s ease;
}

/* Preset C: Reviews Styling */
.hydration-opinion-card {
    border-radius: var(--lemonade-radius);
    box-shadow: var(--lemonade-shadow);
    border: none;
}

/* General Layout helpers applied to unique classes */
.hydration-raised-element {
    box-shadow: var(--lemonade-shadow);
}

/* CSS-Only Gallery Logic */
.hydration-radio-hack {
    display: none;
}

.hydration-main-frame {
    border-radius: var(--lemonade-radius);
    overflow: hidden;
    box-shadow: var(--lemonade-shadow);
    aspect-ratio: 1 / 1;
    background-color: var(--lemonade-surface);
}

.hydration-big-pic {
    display: none;
    width: 100%;
    height: 100%;
    object-fit: contain; /* Better for product images than cover */
}

/* Switch logic based on checked radio */
#view-1:checked ~ .hydration-main-frame .pic-1,
#view-2:checked ~ .hydration-main-frame .pic-2,
#view-3:checked ~ .hydration-main-frame .pic-3,
#view-4:checked ~ .hydration-main-frame .pic-4 {
    display: block;
    animation: fadeIn 0.4s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Preset C: Thumbnails at bottom, opacity on inactive */
.hydration-thumb-lbl {
    display: block;
    cursor: pointer;
    border-radius: 8px;
    overflow: hidden;
    opacity: 0.5;
    transition: opacity 0.3s ease, transform 0.2s ease;
    border: 2px solid transparent;
}

.hydration-thumb-lbl:hover {
    opacity: 0.8;
}

/* Active thumbnail styling */
#view-1:checked ~ .hydration-thumbs-row .lbl-1,
#view-2:checked ~ .hydration-thumbs-row .lbl-2,
#view-3:checked ~ .hydration-thumbs-row .lbl-3,
#view-4:checked ~ .hydration-thumbs-row .lbl-4 {
    opacity: 1;
    border-color: var(--lemonade-core);
    transform: scale(1.05);
}