* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Microsoft YaHei', sans-serif; line-height: 1.6; color: #1f2937; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* 导航栏 */
.navbar { background: #2563eb; color: white; padding: 1rem 0; position: fixed; width: 100%; top: 0; z-index: 1000; box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
.navbar .container { display: flex; justify-content: space-between; align-items: center; }
.nav-brand { display: flex; align-items: center; gap: 12px; }
.company-name { font-size: 1.5rem; font-weight: bold; }
.nav-menu { display: flex; list-style: none; gap: 2rem; }
.nav-menu a { color: white; text-decoration: none; transition: opacity 0.3s; }
.nav-menu a:hover { opacity: 0.8; }

/* 首页横幅 */
.hero { margin-top: 80px; padding: 100px 20px; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; text-align: center; min-height: 500px; display: flex; align-items: center; justify-content: center; }
.hero-content { max-width: 800px; }
.hero h1 { font-size: 3rem; margin-bottom: 1rem; font-weight: 800; }
.hero p { font-size: 1.3rem; opacity: 0.95; }

/* 区块标题 */
.section-title { font-size: 2.5rem; text-align: center; margin-bottom: 3rem; color: #1f2937; }

/* 产品服务 */
.products { padding: 80px 20px; background: #f9fafb; }
.products-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.product-card { background: white; padding: 2rem; border-radius: 12px; box-shadow: 0 4px 6px rgba(0,0,0,0.1); text-align: center; transition: transform 0.3s; }
.product-card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.15); }
.product-icon { font-size: 3rem; margin-bottom: 1rem; }
.product-card h3 { font-size: 1.5rem; margin-bottom: 1rem; color: #1f2937; }
.product-card p { color: #6b7280; line-height: 1.8; }

/* 关于我们 */
.about { padding: 80px 20px; text-align: center; }
.about p { max-width: 800px; margin: 0 auto; font-size: 1.1rem; color: #6b7280; line-height: 1.8; }

/* 页脚 */
.footer { background: #1f2937; color: white; padding: 3rem 20px; text-align: center; }
.footer h3 { margin-bottom: 1rem; font-size: 1.5rem; }
.footer p { margin: 0.5rem 0; opacity: 0.9; }
.footer a { color: white; text-decoration: none; }
.footer a:hover { text-decoration: underline; }

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu { display: none; }
    .hero h1 { font-size: 2rem; }
    .section-title { font-size: 2rem; }
    .products-grid { grid-template-columns: 1fr; }
}