/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: "微软雅黑", sans-serif;
    color: #333;
    line-height: 1.6;
}
.container {
    max-width: 1200px;
    margin: auto;
    padding: 0 20px;
}

/* 顶部导航 */
header {
    position: fixed;
    width: 100%;
    top: 0;
    background: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    z-index: 1000;
}
header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}
header .logo {
    font-size: 24px;
    font-weight: bold;
    color: #007bff;
}
header nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}
header nav ul li a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}
header nav ul li a:hover {
    color: #007bff;
}

/* Banner */
.hero {
    background: #007bff;
    color: #fff;
    padding: 120px 20px 80px;
    text-align: center;
}
.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
}
.hero p {
    font-size: 20px;
    margin-bottom: 30px;
}
.hero .btn {
    display: inline-block;
    padding: 12px 30px;
    background: #fff;
    color: #007bff;
    border-radius: 5px;
    font-weight: bold;
}

/* 优势 & 服务 */
.features, .services {
    padding: 80px 0;
    text-align: center;
}
.features h2, .services h2, .contact h2 {
    font-size: 36px;
    margin-bottom: 50px;
}
.feature-grid, .service-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
}
.feature, .service {
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    flex: 1 1 250px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
.feature h3, .service h3 {
    margin-bottom: 15px;
    color: #007bff;
}

/* 联系我们 */
.contact {
    padding: 80px 0;
    background: #f5f5f5;
}
.contact form {
    max-width: 600px;
    margin: 20px auto 0;
    text-align: left;
}
.contact form label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}
.contact form input,
.contact form textarea {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border-radius: 5px;
    border: 1px solid #ccc;
}
.contact form button {
    background: #007bff;
    color: #fff;
    padding: 12px 25px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

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

/* 响应式 */
@media(max-width: 768px) {
    .feature-grid, .service-grid {
        flex-direction: column;
    }
    .hero h1 {
        font-size: 32px;
    }
}


.contact {
    padding: 100px 0;
    background: #f5f7fb;
}

.contact h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
}

.contact-box {
    max-width: 700px;
    margin: 0 auto;
    background: #fff;
    padding: 50px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

.contact-desc {
    font-size: 18px;
    margin-bottom: 35px;
    color: #666;
}

.contact-item {
    display: flex;
    align-items: center;
    margin-bottom: 25px;
    font-size: 22px;
    color: #333;
}

.contact-item:last-child {
    margin-bottom: 0;
}

.icon {
    width: 40px;
    margin-right: 15px;
    font-size: 24px;
}