* {
    box-sizing: border-box;
}

body { 
    font-family: Arial, sans-serif; 
    margin: 0;
    padding: 20px;
}

nav { 
    background: #333; 
    padding: 10px; 
    margin-bottom: 20px;
}

nav a { 
    color: white; 
    text-decoration: none; 
    padding: 12px 16px;
    display: inline-block;
    min-height: 44px;
}

nav a:hover { 
    background-color: #555;
}

nav .user-links { 
    float: right;
}

@media (max-width: 768px) {
    nav a {
        display: block;
        text-align: center;
    }
    
    nav .user-links {
        float: none;
        border-top: 1px solid #555;
        padding-top: 10px;
        margin-top: 10px;
    }
}

.image-item { 
    border: 1px solid #ccc; 
    margin: 10px; 
    padding: 10px; 
    display: inline-block;
}

.image-item img {
    max-width: 100%;
}

.pagination { 
    margin-top: 20px;
}

.pagination a, 
.pagination strong { 
    padding: 8px 12px;
    margin: 0 5px;
    border: 1px solid #ccc;
    text-decoration: none;
}

.pagination strong {
    background: #333;
    color: white;
}

.error { 
    color: red; 
    padding: 10px; 
    background: #fee; 
    border: 1px solid red;
}

.success { 
    color: green; 
    padding: 10px; 
    background: #efe; 
    border: 1px solid green;
}

button, input[type="submit"] {
    min-height: 44px;
    padding: 12px 16px;
    background: #333;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #555;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="file"],
input[type="number"] {
    padding: 8px;
    border: 1px solid #ccc;
}

input[type="checkbox"],
input[type="radio"] {
    width: 20px;
    height: 20px;
}

fieldset {
    border: 1px solid #ccc;
    padding: 10px;
}

footer {
    margin-top: 40px; 
    padding-top: 20px; 
    border-top: 1px solid #ccc;
}