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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

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

/* 导航栏 */
.navbar {
    background-color: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
}

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

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #2563eb;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: #2563eb;
}

/* 首页横幅 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 100px 0;
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 24px;
    margin-bottom: 15px;
    opacity: 0.95;
}

.hero-desc {
    font-size: 18px;
    opacity: 0.9;
}

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

.about h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 50px;
    color: #1e293b;
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-content p {
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 20px;
    color: #475569;
    text-align: justify;
}

/* 服务范围 */
.services {
    background-color: #f8fafc;
    padding: 80px 0;
}

.services h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 50px;
    color: #1e293b;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.service-card {
    background-color: #fff;
    padding: 40px 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.15);
}

.service-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 22px;
    margin-bottom: 15px;
    color: #1e293b;
}

.service-card p {
    color: #64748b;
    line-height: 1.6;
}

/* 客户案例 */
.clients {
    background-color: #fff;
    padding: 80px 0;
}

.clients h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 20px;
    color: #1e293b;
}

.clients-intro {
    text-align: center;
    color: #64748b;
    margin-bottom: 50px;
    font-size: 18px;
}

.clients-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.client-item {
    background-color: #f8fafc;
    padding: 25px;
    text-align: center;
    border-radius: 8px;
    font-weight: 500;
    color: #475569;
    transition: background-color 0.3s, color 0.3s;
}

.client-item:hover {
    background-color: #2563eb;
    color: white;
}

/* 联系我们 */
.contact {
    background-color: #f8fafc;
    padding: 80px 0;
}

.contact h2 {
    font-size: 36px;
    text-align: center;
    margin-bottom: 50px;
    color: #1e293b;
}

.contact-info {
    max-width: 700px;
    margin: 0 auto;
    background-color: #fff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.contact-item {
    padding: 15px 0;
    font-size: 16px;
    border-bottom: 1px solid #e2e8f0;
}

.contact-item:last-child {
    border-bottom: none;
}

.contact-item strong {
    color: #1e293b;
    margin-right: 10px;
}

.contact-item a {
    color: #2563eb;
    text-decoration: none;
    transition: color 0.3s;
}

.contact-item a:hover {
    color: #1d4ed8;
    text-decoration: underline;
}

/* 页脚 */
.footer {
    background-color: #1e293b;
    color: white;
    padding: 30px 0;
    text-align: center;
}

.footer p {
    opacity: 0.8;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        gap: 15px;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 20px;
    }

    .hero-desc {
        font-size: 16px;
    }

    .about h2,
    .services h2,
    .clients h2,
    .contact h2 {
        font-size: 28px;
    }

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

    .clients-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
}