body {
    font-family: Arial, sans-serif;
    background: #f3f6fa;
    margin: 0;
    text-align: center;
}

header {
    background: #3f51b5;
    color: white;
    padding: 20px;
}

nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    background: #283593;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

nav li {
    margin: 5px 10px;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 10px;
    display: block;
}

nav a:hover {
    background: #1a237e;
    border-radius: 6px;
}

main {
    padding: 30px;
}

.gallery {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}

.gallery img {
    width: 200px;
    border-radius: 8px;
}

.file-item {
    margin: 10px;
}

.file-item a {
    display: inline-block;
    background: #fff;
    padding: 10px;
    border-radius: 6px;
    text-decoration: none;
    color: #1a237e;
    font-weight: bold;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.file-item a:hover {
    background: #e3f2fd;
}