* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Microsoft YaHei", sans-serif;
}
body {
  color: #333;
  background: #f6f8fc;
  line-height: 1.7;
}
.container {
  width: 1200px;
  margin: 0 auto;
}
a {
  text-decoration: none;
  color: #333;
}
ul {
  list-style: none;
}
.btn {
  display: inline-block;
  padding: 0 30px;
  height: 46px;
  line-height: 46px;
  background: #165DFF;
  color: #fff;
  border-radius: 4px;
  font-size: 15px;
  transition: 0.3s;
}
.btn:hover {
  background: #0E4BD9;
}

.header {
  background: #fff;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 99;
}
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}
.logo {
  font-size: 22px;
  font-weight: bold;
  color: #165DFF;
}
.nav-list {
  display: flex;
}
.nav-list li {
  margin-left: 36px;
}
.nav-list li a {
  font-size: 16px;
  font-weight: 500;
}
.nav-list li a.active,
.nav-list li a:hover {
  color: #165DFF;
}

.banner {
  height: 480px;
  background: linear-gradient(135deg, #165DFF, #0E4BD9);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  text-align: center;
}
.banner h1 {
  font-size: 44px;
  margin-bottom: 16px;
}
.banner p {
  font-size: 18px;
  opacity: 0.95;
  margin-bottom: 30px;
}

.section {
  padding: 80px 0;
}
.section-title {
  text-align: center;
  margin-bottom: 50px;
}
.section-title h2 {
  font-size: 32px;
  color: #1f2937;
  padding-bottom: 14px;
  position: relative;
  display: inline-block;
}
.section-title h2::after {
  content: '';
  width: 50px;
  height: 3px;
  background: #165DFF;
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
}
.section-title p {
  color: #6b7280;
  margin-top: 12px;
  font-size: 15px;
}

.service-list {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}
.service-item {
  flex: 1;
  min-width: 350px;
  background: #fff;
  padding: 36px 30px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.04);
  transition: 0.3s;
}
.service-item:hover {
  transform: translateY(-4px);
}
.service-item h3 {
  font-size: 20px;
  color: #1f2937;
  margin-bottom: 14px;
}
.service-item p {
  color: #6b7280;
  font-size: 14px;
}

.news-list .news-item {
  background: #fff;
  padding: 24px 30px;
  border-radius: 8px;
  margin-bottom: 16px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}
.news-item h3 {
  font-size: 18px;
  color: #1f2937;
  margin-bottom: 8px;
}
.news-item .time {
  font-size: 13px;
  color: #9ca3af;
  margin-bottom: 10px;
}
.news-item p {
  color: #6b7280;
  font-size: 14px;
}

.contact-info {
  background: #fff;
  padding: 40px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.04);
  max-width: 600px;
  margin: 0 auto;
}
.contact-info h3 {
  font-size: 22px;
  margin-bottom: 24px;
  color: #1f2937;
}
.contact-info p {
  margin-bottom: 16px;
  color: #4b5563;
  font-size: 15px;
}

.about-text {
  max-width: 800px;
  margin: 0 auto;
  color: #4b5563;
  font-size: 15px;
  line-height: 1.9;
}
.about-text h3 {
  font-size: 24px;
  margin-bottom: 20px;
  color: #1f2937;
}
.about-text p {
  margin-bottom: 16px;
}

.footer {
  background: #1f2937;
  color: #fff;
  padding: 50px 0 24px;
}
.footer-content {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  padding-bottom: 30px;
  border-bottom: 1px solid #374151;
}
.footer-item {
  flex: 1;
  min-width: 220px;
}
.footer-item h4 {
  font-size: 16px;
  color: #165DFF;
  margin-bottom: 18px;
}
.footer-item p {
  color: #d1d5db;
  font-size: 14px;
  line-height: 1.8;
}
.copyright {
  text-align: center;
  padding-top: 24px;
  color: #9ca3af;
  font-size: 13px;
}