:root {
    /* Theme colors */
    --primary: #d4380d;
    --accent: #ff6b35;

    /* Card styling */
    --card-radius: 12px;
    --gallery-columns: 4;

    /* Show/hide filenames */
    --filename-display: none;
}

/* Light mode */
/* Dark mode */
:root {
    --bg: #0f172a;
    --card-bg: #1e293b;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --border: #334155;
    --shadow: 0 1px 3px rgba(0,0,0,0.3);
}

/* Base styles using CSS variables */
body {
    background: var(--bg);
    color: var(--text);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(var(--gallery-columns), 1fr);
    gap: 16px;
}

.photo-card {
    background: var(--card-bg);
    border-radius: var(--card-radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.photo-card .filename {
    display: var(--filename-display);
    padding: 8px 12px;
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-accent {
    background: var(--accent);
    color: white;
}

a {
    color: var(--primary);
}

/* Responsive columns */
@media (max-width: 1400px) {
    .gallery-grid {
        grid-template-columns: repeat(min(var(--gallery-columns), 4), 1fr);
    }
}

@media (max-width: 1000px) {
    .gallery-grid {
        grid-template-columns: repeat(min(var(--gallery-columns), 3), 1fr);
    }
}

@media (max-width: 700px) {
    .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 400px) {
    .gallery-grid {
        grid-template-columns: 1fr;
    }
}