/* CSS Variables for Dark Modern theme with Rose accents */
:root {
    --primary: #dc2626;      /* Strong Crimson Red */
    --secondary: #fca5a5;    /* Light Pinkish Rose */
    --accent: #dc2626;       /* Accent Red */
    --text: #f5f5f5;         /* Light Gray text */
    --bg: #0f0f0f;           /* Very Dark Gray background */
}

/* Base resets & styles */
body {
    background-color: var(--bg);
    color: var(--text);
}

section {
    padding: 32px 16px;
}

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

/* Card Styling */
.card {
    background: #1a1a1a;
    border: 1px solid #333;
    border-radius: 12px;
}

/* Button Customization */
.btn {
    border-radius: 8px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 700;
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn:hover {
    background: #b91c1c; /* Darker red on hover */
}

/* Typography Fluid Sizing */
h1 {
    font-weight: 800;
    font-size: clamp(18px, 4vw, 24px);
}

h2 {
    font-size: clamp(22px, 5vw, 32px);
}

p {
    font-size: clamp(14px, 4vw, 16px);
}

/* Strict Screen Reader Utility */
.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 System */
.gallery-main {
    position: relative;
    width: 100%;
    padding-bottom: 100%; /* Perfect square ratio */
    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;
}

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

.thumbnails label {
    border: 2px solid #333;
    border-radius: 6px;
    overflow: hidden;
    aspect-ratio: 1;
    transition: border-color 0.2s ease-in-out;
}

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

/* Radio Control Logic for Gallery */
#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); }