/* Design System Variables */
:root {
    --primary: #0284c7;
    --secondary: #f0f9ff;
    --accent: #10b981;
    --text: #f5f5f5;
    --bg: #0f0f0f;
}

/* Base Styles */
body {
    background: var(--bg);
    color: var(--text);
    font-size: clamp(14px, 4vw, 16px);
    overflow-x: hidden;
}

section {
    padding: 64px 16px;
}

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

.btn {
    border-radius: 8px;
    background: var(--accent);
    color: #ffffff;
    font-weight: 700;
    min-height: 44px;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.btn:hover {
    background-color: #059669;
}

h1 {
    font-weight: 800;
    font-size: clamp(22px, 5vw, 36px);
}

/* Screen Reader Only 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;
}

/* Interactive Image Gallery */
.gallery-main {
    position: relative;
    width: 100%;
    padding-bottom: 100%; /* Forces exact 1:1 Aspect Ratio */
    overflow: hidden;
}

.slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    z-index: 1;
    transition: opacity 0.3s ease-in-out;
}

/* Gallery Radio Selections */
#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;
}

/* Active Thumbnail Indicator */
#img-1:checked ~ .thumbnails label[for="img-1"] {
    border-color: var(--primary);
    transform: scale(1.05);
}

#img-2:checked ~ .thumbnails label[for="img-2"] {
    border-color: var(--primary);
    transform: scale(1.05);
}

#img-3:checked ~ .thumbnails label[for="img-3"] {
    border-color: var(--primary);
    transform: scale(1.05);
}

#img-4:checked ~ .thumbnails label[for="img-4"] {
    border-color: var(--primary);
    transform: scale(1.05);
}