:root {
    --primary: #2c3e50;
    --secondary: #7f8c8d;
    --bg: white;
    --text: #333;
}

.dark {
    --bg: #1a1a1a;
    --text: #e0e0e0;
}

body {
    background: var(--bg);
    color: var(--text);
    transition: background 0.3s, color 0.3s;
}

nav {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--primary);
}

nav a {
    color: white;
    text-decoration: none;
}

.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1rem;
    padding: 1rem;
}

.card img {
    width: 100%;
    height: auto;
    border-radius: 8px;
}

.lazyload {
    opacity: 0;
    transition: opacity 0.3s;
}

.lazyloaded {
    opacity: 1;
}

@media (max-width: 768px) {
    nav { flex-direction: column; }
}