/* 全局基础设置 */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: #1e293b;
  line-height: 1.6;
}
a { text-decoration: none; color: inherit; }

/* 顶部导航 */
.nav {
  position: sticky; top: 0;
  background: #ffffff;
  border-bottom: 1px solid #e2e8f0;
  z-index: 10;
}
.nav-inner {
  max-width: 960px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
}
.logo { font-size: 18px; font-weight: 600; color: #185FA5; }
.nav nav a { margin-left: 22px; color: #444441; font-size: 14px; }
.nav nav a:hover { color: #185FA5; }

/* 首屏 */
.hero {
  text-align: center;
  padding: 90px 20px 100px;
  background: #E6F1FB;
}
.hero h1 { font-size: 34px; font-weight: 600; margin-bottom: 16px; color: #0C447C; }
.hero p { font-size: 17px; color: #444441; max-width: 560px; margin: 0 auto 28px; }
.btn {
  display: inline-block;
  background: #185FA5; color: #fff;
  padding: 12px 30px; border-radius: 8px; font-size: 15px;
}
.btn:hover { background: #0C447C; }

/* 通用区块 */
.section { max-width: 960px; margin: 0 auto; padding: 64px 20px; }
.section.alt { background: #F1EFE8; max-width: none; }
.section.alt > * { max-width: 960px; margin-left: auto; margin-right: auto; }
.section h2 { font-size: 26px; font-weight: 600; text-align: center; margin-bottom: 36px; color: #0C447C; }
.lead { font-size: 17px; color: #444441; text-align: center; }

/* 卡片 */
.cards { display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; }
.card {
  flex: 1 1 260px; max-width: 300px;
  background: #fff; border: 1px solid #e2e8f0; border-radius: 12px;
  padding: 26px;
}
.card h3 { font-size: 18px; color: #185FA5; margin-bottom: 10px; }
.card p { color: #5F5E5A; font-size: 14px; }

/* 联系 */
.contact { list-style: none; text-align: center; }
.contact li { font-size: 16px; color: #444441; margin: 10px 0; }

/* 页脚 */
.footer { text-align: center; padding: 28px 20px; background: #0C447C; color: #fff; font-size: 13px; }

/* 手机端适配 */
@media (max-width: 600px) {
  .hero h1 { font-size: 26px; }
  .nav nav a { margin-left: 14px; font-size: 13px; }
}