/* 车滔滔静态页面通用样式 */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  color: #333;
  background: #f5f6f7;
  line-height: 1.8;
}
.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}
.doc {
  background: #fff;
  border-radius: 12px;
  padding: 36px 32px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}
h1 {
  font-size: 24px;
  text-align: center;
  margin-bottom: 8px;
  color: #1a1a1a;
}
.effective {
  text-align: center;
  color: #999;
  font-size: 13px;
  margin-bottom: 28px;
}
h2 {
  font-size: 17px;
  color: #1a1a1a;
  margin: 26px 0 10px;
  padding-left: 10px;
  border-left: 4px solid #2b6cb0;
}
h3 {
  font-size: 15px;
  color: #333;
  margin: 14px 0 6px;
}
p {
  font-size: 14px;
  margin-bottom: 8px;
  text-align: justify;
}
ul, ol {
  font-size: 14px;
  padding-left: 24px;
  margin-bottom: 8px;
}
li { margin-bottom: 4px; }
.footer {
  text-align: center;
  color: #999;
  font-size: 12px;
  margin-top: 32px;
}
/* 入口页 */
.nav-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 24px;
}
.nav-card {
  display: block;
  background: #fff;
  border-radius: 12px;
  padding: 32px 20px;
  text-align: center;
  text-decoration: none;
  color: #1a1a1a;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transition: transform 0.15s, box-shadow 0.15s;
}
.nav-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}
.nav-card .title {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 6px;
}
.nav-card .desc {
  font-size: 13px;
  color: #999;
}
.brand {
  text-align: center;
  font-size: 20px;
  font-weight: 700;
  color: #1a1a1a;
  margin-top: 48px;
}
.brand-sub {
  text-align: center;
  color: #999;
  font-size: 13px;
  margin-top: 4px;
}
@media (max-width: 600px) {
  .doc { padding: 24px 18px; }
  h1 { font-size: 20px; }
  .nav-cards { grid-template-columns: 1fr; }
}