body {
  margin: 0;
  font-family: 'PingFang SC', 'Microsoft YaHei', Arial, sans-serif;
  background: #f7fafd;
  color: #222;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #003366;
  color: #fff;
  padding: 0 40px;
  height: 70px;
}
.logo {
  font-size: 2rem;
  font-weight: bold;
  letter-spacing: 2px;
}
nav ul {
  list-style: none;
  display: flex;
  gap: 30px;
  margin: 0;
  padding: 0;
}
nav a {
  color: #fff;
  text-decoration: none;
  font-size: 1.1rem;
  transition: color 0.2s;
}
nav a:hover {
  color: #00aaff;
}
.banner {
  position: relative;
  height: 400px;
  background: linear-gradient(120deg, #005fa3 60%, #e6f0fa 100%);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.banner-slide {
  position: absolute;
  width: 100%;
  left: 0;
  top: 0;
  opacity: 0;
  transition: opacity 1s;
  text-align: center;
  color: #fff;
  z-index: 1;
}
.banner-slide.active {
  opacity: 1;
  z-index: 2;
}
.banner-slide h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  letter-spacing: 2px;
}
.banner-slide p {
  font-size: 1.2rem;
}
.banner-controls {
  position: absolute;
  width: 100%;
  top: 50%;
  left: 0;
  display: flex;
  justify-content: space-between;
  transform: translateY(-50%);
  z-index: 3;
}
.banner-controls span {
  background: rgba(0,0,0,0.3);
  color: #fff;
  font-size: 2rem;
  padding: 0 20px;
  cursor: pointer;
  user-select: none;
  border-radius: 50%;
  transition: background 0.2s;
}
.banner-controls span:hover {
  background: #00aaff;
}
section {
  max-width: 1100px;
  margin: 40px auto;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.05);
  padding: 40px 30px;
}
section h2 {
  color: #005fa3;
  margin-bottom: 20px;
  font-size: 2rem;
}
.services ul, .news ul {
  padding-left: 20px;
}
.services li, .news li {
  margin-bottom: 10px;
  font-size: 1.1rem;
}
.contact p {
  line-height: 2;
}
footer {
  text-align: center;
  padding: 20px 0;
  background: #003366;
  color: #fff;
  margin-top: 40px;
}
@media (max-width: 800px) {
  header {
    flex-direction: column;
    height: auto;
    padding: 10px 10px;
  }
  nav ul {
    gap: 15px;
  }
  .banner {
    height: 220px;
  }
  section {
    padding: 20px 10px;
  }
  section h2 {
    font-size: 1.3rem;
  }
}