/* 全局重置与基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}

body {
    color: #333;
    background-color: #f5f5f5;
}

/* 导航栏样式 */
.nav {
    background-color: #2c3e50;
    padding: 15px 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 999;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

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

.nav-menu {
    display: flex;
    list-style: none;
}

.nav-menu li {
    margin-left: 30px;
}

.nav-menu a {
    color: #fff;
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: #3498db;
}

/* 首页横幅样式 */
.banner {
    height: 100vh;
    background: linear-gradient(rgba(44, 62, 80, 0.8), rgba(44, 62, 80, 0.8)), url("https://picsum.photos/1920/1080?tech") center/cover no-repeat;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
    margin-top: 60px;
}

.banner h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

.banner p {
    font-size: 20px;
    margin-bottom: 40px;
    max-width: 800px;
}

.btn {
    padding: 12px 30px;
    background-color: #3498db;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #2980b9;
}

/* 通用模块样式 */
.section {
    padding: 80px 0;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 60px;
    color: #2c3e50;
}

/* 关于我们样式 */
.about {
    background-color: #fff;
    padding: 80px 0;
}

.about-content {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 40px;
}

.about-text {
    flex: 1;
    min-width: 300px;
}

.about-text h3 {
    font-size: 24px;
    margin-bottom: 20px;
    color: #3498db;
}

.about-text p {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-img {
    flex: 1;
    min-width: 300px;
}

.about-img img {
    width: 100%;
    border-radius: 8px;
}

/* 服务项目样式 */
.services {
    background-color: #f8f9fa;
}

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

.service-card {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.service-card:hover {
    transform: translateY(-5px);
}

.service-card i {
    font-size: 40px;
    color: #3498db;
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #2c3e50;
}

.service-card p {
    font-size: 14px;
    line-height: 1.6;
    color: #666;
}

/* 案例展示样式 */
.cases {
    background-color: #fff;
}

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

.case-card {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

.case-card:hover {
    transform: translateY(-5px);
}

.case-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.case-card .case-info {
    padding: 20px;
}

.case-card h3 {
    font-size: 18px;
    margin-bottom: 10px;
    color: #2c3e50;
}

.case-card p {
    font-size: 14px;
    color: #666;
}

/* 联系我们样式 */
.contact {
    background-color: #f8f9fa;
}

.contact-content {
    display: flex;
    flex-wrap: wrap;
    gap: 40px;
}

.contact-info {
    flex: 1;
    min-width: 300px;
}

.contact-info h3 {
    font-size: 24px;
    margin-bottom: 30px;
    color: #2c3e50;
}

.contact-info p {
    font-size: 16px;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.contact-info p i {
    font-size: 20px;
    color: #3498db;
    margin-right: 10px;
}

.contact-form {
    flex: 1;
    min-width: 300px;
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 12px;
    margin-bottom: 20px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.contact-form textarea {
    height: 150px;
    resize: none;
}

/* 页脚样式 */
.footer {
    background-color: #2c3e50;
    color: #fff;
    padding: 40px 0;
    text-align: center;
}

.footer p {
    font-size: 14px;
    margin-top: 20px;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .banner h1 {
        font-size: 36px;
    }

    .banner p {
        font-size: 18px;
    }

    .section-title {
        font-size: 28px;
    }
}