* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
}

body {
    background: #f8f8f8;
    text-align: center;
}

header {
    background: #000000; 
    color: white;
    padding: 20px 0;
}

nav ul {
    list-style: none;
    padding: 0;
}

nav ul li {
    display: inline-block;
    margin: 0 20px; 
}

nav ul li a {
    color: white;
    text-decoration: none;
    padding: 10px 15px; 
    background: rgba(255, 255, 255, 0.1);
    border-radius: 5px;
    transition: background 0.3s;
}

nav ul li a:hover {
    background: rgba(255, 255, 255, 0.3);
}

.wrapper {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); /* 避免 5+1 */
    gap: 20px;
    padding: 20px;
    justify-items: center;
}

.box {
    background: white;
    padding: 10px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
    width: 100%;
    max-width: 320px; 
}

.box:hover {
    transform: scale(1.05);
}

.box img {
    width: 100%;
    height: auto;
    border-radius: 5px;
}

footer {
    background: #333;
    color: white;
    padding: 15px 0;
    margin-top: 20px;
}

@media (max-width: 768px) {
    nav ul {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    nav ul li {
        margin-bottom: 10px;
    }
}