body {
    font-family: 'Arial', sans-serif;
    color: #333;
    margin: 0;
    padding: 0;
    background: url('images/background_large.jpg') no-repeat center center fixed; 
    background-size: cover;
}

header {
    background-color: rgba(34, 34, 34, 0.8); /* 半透明背景 */
    padding: 15px 0;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

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

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

header nav ul li a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s;
}

header nav ul li a:hover {
    color: #f39c12;
}

section {
    background-color: rgba(255, 255, 255, 0.8); /* 半透明背景 */
    padding: 40px;
    margin: 20px auto;
    border-radius: 10px;
    max-width: 800px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

h1, h2 {
    color: #333;
}

h1 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 20px;
}

h2 {
    font-size: 2rem;
    margin-top: 40px;
    margin-bottom: 20px;
}

p, ul {
    font-size: 1.2rem;
    line-height: 1.6;
}

ul li {
    margin-bottom: 10px;
}

footer {
    background-color: rgba(34, 34, 34, 0.8); /* 半透明背景 */
    color: #fff;
    text-align: center;
    padding: 10px 0;
    width: 100%;
    box-shadow: 0 -4px 6px rgba(0, 0, 0, 0.1);
    position: relative;
}