/* 全局样式 */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

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

nav ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
}

nav ul li {
    margin: 0 1rem;
}

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

.hero {
    text-align: center;
    padding: 4rem 2rem;
    background-color: #f0f0f0;
}

.hero h1 {
    font-size: 2.5rem;
}

.hero button {
    background-color: #333;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    cursor: pointer;
    border-radius: 4px;
}

.hero button:hover {
    background-color: #555;
}

.features {
    display: flex;
    justify-content: center;
    padding: 4rem 2rem;
}

.feature {
    text-align: center;
    max-width: 300px;
    margin: 0 2rem;
}

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