/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: #000; /* 设置整体背景为纯黑色 */
    color: #fff; /* 设置文字颜色为白色，保证在黑色背景下可见 */
}

header {
    background-color: #333;
    color: #fff;
    padding: 1rem;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 1rem;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
}

.hero {
    height: 400px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    background-color: #000; /* 确保 hero 部分背景也是黑色 */
}

.btn {
    background-color: #ff6600;
    color: #fff;
    padding: 0.8rem 2rem;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 1rem;
}

section {
    padding: 2rem;
    text-align: center;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1rem;
}