* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: #333;
}

.header {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.nav {
    max-width: 1500px;
    margin: 0 auto;
    padding: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #333;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: #333;
    text-decoration: none;
    padding: 5px 10px;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #007bff;
}

.banner {
    height: 600px;
    background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('../images/banner.jpg');
    background-size: cover;
    background-position: center;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    text-align: center;
    margin-top: 60px;
}

.content {
    max-width: 1500px;
    margin: 60px auto;
    padding: 0 15px;
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.service-card {
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    text-align: center;
}

.footer {
    background: #333;
    color: white;
    padding: 40px 0;
    margin-top: 60px;
}

.footer-content {
    max-width: 1500px;
    margin: 0 auto;
    padding: 0 15px;
    text-align: center;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.btn {
    background: #007bff;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

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