body {
    margin: 0;
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #f7f7f7;
    color: #222;
}
header {
    background: #222;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
    letter-spacing: 2px;
}
main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}
.thumbnails {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1.5rem;
}
.thumbnails img {
    width: 100%;
    aspect-ratio: 1/1;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}
.thumbnails img:hover {
    transform: scale(1.04);
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}
#fullscreen-view {
    position: fixed;
    inset: 0;
    background: rgba(30,30,30,0.98);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    transition: opacity 0.2s;
}
#fullscreen-view.hidden {
    display: none;
}
#fullscreen-img {
    max-width: 90vw;
    max-height: 80vh;
    border-radius: 12px;
    box-shadow: 0 4px 32px rgba(0,0,0,0.3);
    margin: 2rem 0;
    background: #fff;
}
.nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,0,0,0.4);
    color: #fff;
    border: none;
    font-size: 2.5rem;
    padding: 0.5rem 1.2rem;
    border-radius: 50%;
    cursor: pointer;
    z-index: 1010;
    transition: background 0.2s;
}
#prev-img { left: 2vw; }
#next-img { right: 2vw; }
.nav-btn:hover {
    background: rgba(0,0,0,0.7);
}
#close-fullscreen {
    position: absolute;
    top: 2vh;
    right: 3vw;
    background: rgba(0,0,0,0.5);
    color: #fff;
    border: none;
    font-size: 2rem;
    border-radius: 50%;
    width: 2.5rem;
    height: 2.5rem;
    cursor: pointer;
    z-index: 1020;
    transition: background 0.2s;
}
#close-fullscreen:hover {
    background: #d32f2f;
}
@media (max-width: 600px) {
    .thumbnails {
        grid-template-columns: repeat(2, 1fr);
    }
    #fullscreen-img {
        max-width: 98vw;
        max-height: 60vh;
    }
}