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

body {
    font-family: 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4edf9 100%);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
header {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    padding: 0 20px;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    font-size: 28px;
    font-weight: bold;
    color: #2c3e50;
    text-decoration: none;
}

.logo span {
    color: #3498db;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: #2c3e50;
    font-weight: 500;
    transition: color 0.3s;
}

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

/* 主要内容区域 */
.main-content {
    margin-top: 80px; /* 为固定导航留出空间 */
    padding: 60px 0;
}

.intro-section {
    text-align: center;
    padding: 60px 0;
}

.intro-section h1 {
    font-size: 3rem;
    color: #2c3e50;
    margin-bottom: 20px;
}

.intro-section p {
    font-size: 1.2rem;
    color: #555;
    max-width: 700px;
    margin: 0 auto 30px;
}

/* 服务介绍 */
.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: #2c3e50;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: #3498db;
    margin: 15px auto;
    border-radius: 2px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.service-card {
    background: white;
    padding: 40px 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    border-top: 4px solid #3498db;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    color: #3498db;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #2c3e50;
}

.service-card p {
    color: #666;
    line-height: 1.6;
}

/* 项目展示 */
.projects-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
}

.project-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}

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

.project-image {
    height: 200px;
    background: linear-gradient(45deg, #667eea, #764ba2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.project-content {
    padding: 25px;
}

.project-content h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: #2c3e50;
}

.project-content p {
    color: #666;
    line-height: 1.6;
}

/* 联系我们 */
.contact-section {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
}

.contact-section .section-title {
    color: white;
}

.contact-info {
    text-align: center;
    font-size: 1.2rem;
}

.email-link {
    color: #3498db;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s;
}

.email-link:hover {
    color: #5dade2;
    text-decoration: underline;
}

/* 页脚 */
footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 30px 0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .intro-section h1 {
        font-size: 2.2rem;
    }

    .intro-section p {
        font-size: 1rem;
    }

    .nav-links {
        display: none;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 2rem;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .project-grid {
        grid-template-columns: 1fr;
    }
}