* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Microsoft YaHei", Arial, sans-serif;
}

body {
  color: #333;
  line-height: 1.6;
  background-color: #fff;
}

a { text-decoration: none; color: #333; }
ul { list-style: none; }

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
  object-fit: cover;
}

.header {
  background: #fff;
  box-shadow: 0 2px 10px rgba(0,0,0,0.08);
  position: sticky;
  top: 0;
  z-index: 999;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  font-size: 22px;
  font-weight: bold;
  color: #2563EB;
}

.nav-menu {
  display: flex;
  gap: 40px;
}

.nav-menu a {
  font-size: 16px;
  padding: 10px 0;
  transition: 0.3s;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: #2563EB;
  border-bottom: 2px solid #2563EB;
}

.banner {
  height: 420px;
  background: linear-gradient(135deg, rgba(37,99,235,0.85), rgba(30,64,175,0.9));
  color: #fff;
  display: flex;
  align-items: center;
  text-align: center;
}

.banner h1 {
  font-size: 44px;
  margin-bottom: 20px;
  letter-spacing: 2px;
}

.banner p {
  font-size: 18px;
  max-width: 700px;
  margin: 0 auto;
}

.section {
  padding: 60px 0;
}

.section-title {
  text-align: center;
  font-size: 32px;
  margin-bottom: 40px;
  color: #1e293b;
}

.section-title::after {
  content: '';
  width: 60px;
  height: 3px;
  background: #2563EB;
  display: block;
  margin: 12px auto;
  border-radius: 2px;
}

.card-box {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  margin-top: 30px;
}

.card {
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  text-align: center;
  transition: 0.3s;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: 0 10px 25px rgba(37,99,235,0.15);
  border-color: #2563EB;
}

.card-img { height: 180px; }
.card-body { padding: 25px; }
.card h3 {
  color: #2563EB;
  margin-bottom: 12px;
  font-size: 20px;
}
.card p { color: #64748b; font-size: 14px; }

.home-banner { padding: 0 0 60px; }
.home-img {
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(37,99,235,0.12);
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 25px;
  margin-top: 30px;
}

.feature-item {
  text-align: center;
  padding: 35px 25px;
  background: #f8faff;
  border-radius: 10px;
  transition: 0.3s;
}

.feature-item:hover {
  background: #eff6ff;
}

.feature-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto 18px;
  background: #2563EB;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 24px;
  font-weight: bold;
}

.feature-item h3 {
  color: #1e293b;
  margin-bottom: 10px;
  font-size: 18px;
}

.feature-item p { color: #64748b; font-size: 14px; }

.btn {
  display: inline-block;
  padding: 12px 32px;
  background: #2563EB;
  color: #fff;
  border-radius: 6px;
  margin-top: 20px;
  transition: 0.3s;
}

.btn:hover { background: #1d4ed8; }

.contact-form { max-width: 600px; margin: 0 auto; }
.form-group { margin-bottom: 20px; }
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 15px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 16px;
}
.form-group textarea { min-height: 150px; resize: vertical; }

.contact-info {
  text-align: center;
  margin-bottom: 40px;
  font-size: 16px;
  line-height: 2.5;
}

.footer {
  background: #1e293b;
  color: #fff;
  padding: 40px 0;
  text-align: center;
}
.footer p { margin-bottom: 10px; }

@media (max-width: 768px) {
  .nav { flex-direction: column; height: auto; padding: 20px 0; }
  .nav-menu { margin-top: 20px; gap: 20px; }
  .banner { height: 300px; padding: 0 20px; }
  .banner h1 { font-size: 28px; }
  .card-img { height: 150px; }
}