/* 全局样式 */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: #333;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

h2 {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 30px;
}

.btn {
    display: inline-block;
    background-color: #007BFF;
    color: #fff;
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background-color: #0056b3;
}

/* 头部导航 */
header {
    background-color: #333;
    color: #fff;
    padding: 20px 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 50px;
}

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

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: #007BFF;
}

.menu-toggle {
    display: none;
    cursor: pointer;
}

/* 横幅部分 */
.hero {
    background-image: url('hero-bg.jpg');
    background-size: cover;
    background-position: center;
    color: #fff;
    text-align: center;
    padding: 150px 0;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
}

/* 关于我们 */
.about {
    padding: 100px 0;
    text-align: center;
}

/* 服务内容 */
.services {
    background-color: #f4f4f4;
    padding: 100px 0;
}

.service-items {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.service-item {
    width: 45%;
    text-align: center;
    margin: 20px;
    padding: 20px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.service-item i {
    font-size: 3rem;
    color: #007BFF;
    margin-bottom: 20px;
}

/* 我们的优势 */
.advantages {
    padding: 100px 0;
}

.advantage-items {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.advantage-item {
    width: 30%;
    text-align: center;
    margin: 20px;
}

.advantage-item i {
    font-size: 3rem;
    color: #007BFF;
    margin-bottom: 20px;
}

/* 联系我们 */
.contact {
    padding: 100px 0;
    text-align: center;
}

.contact form input,
.contact form textarea {
    width: 100%;
    padding: 10px;
    margin-bottom: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

.contact form input[type="submit"] {
    background-color: #007BFF;
    color: #fff;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.contact form input[type="submit"]:hover {
    background-color: #0056b3;
}

/* 页脚 */
footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 20px 0;
}

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

footer ul li {
    margin: 0 10px;
}

footer ul li a {
    color: #fff;
    text-decoration: none;
    transition: color 0.3s ease;
}

footer ul li a:hover {
    color: #007BFF;
}

/* 响应式设计 */
@media (max-width: 768px) {
    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: #333;
        z-index: 1;
    }

    nav ul.show {
        display: flex;
    }

    nav ul li {
        margin: 10px 0;
        text-align: center;
    }

    .menu-toggle {
        display: block;
    }

    .service-item,
    .advantage-item {
        width: 100%;
    }
}