* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family:微软雅黑;
}
html, body {
  height: 100%;
}
body {
  color: #222222;
  background: #fafafa;
  position: relative;
}
.banner {
  width: 100%;
  background: linear-gradient(90deg,#4aa3d8 0%,#78c0e0 100%);
  color: #fff;
  padding: 36px 16px;
  text-align: center;
}
.banner h1 {
  margin: 0;
  font-size: 28px;
  letter-spacing: 1px;
}
.banner .subtitle{
  margin-top: 6px;
  font-size: 14px;
  opacity: 0.95;
}
.nav {
  width: 100%;
  background: #fff;
  border-bottom: 1px solid #e6e6e6;
}
.nav ul {
  display: flex;
  list-style: none;
  justify-content: center;
  gap:8px;
  padding: 8px 12px;
  flex-wrap: wrap;
}
.nav a {
  display: block;
  padding: 10px 16px;
  text-decoration: none;
  color: #333;
  font-size: 15px;
  border-radius: 6px;
  transition: background .18s, color .18s;
}
.nav a:hover,
.nav a:focus {
  background: #eaf7fb;
  color: #0b5672;
}
.nav a.active {
  background: #0b5672;
  color: #fff;
}
.content {
  max-width: 1000px;
  margin: 28px auto;
  padding: 0 16px;
  font-size: 16px;
  line-height: 1.8;
}
.content h2 {margin-bottom:12px}
.card {
  background: #fff;
  border: 1px solid #eee;
  padding: 14px;
  border-radius: 6px;yuan
}

.footer {
  width: 100%;
  padding: 18px 12px;
  background: #222;
  color: #fff;
  text-align: center;
  font-size: 14px;
  margin-top: 40px;
}
form{
  background-color: #f9f9f9;
  padding: 20px;
  border-radius: 8px;
  margin-bottom: 30px;
}
.group{
  margin-bottom: 15px;
}
.group label{
  display: block;
  margin-bottom: 5px;
  font-weight: bold;
}
.group input,.group textarea{
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  box-sizing:border-box;
}
.submit{
  background-color: #4caf50;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
}
.submit:hover{
  background-color: #45a049;
}
.list{
  margin-top: 20px;
}
.item{
  background-color: #fff;
  border: 1px solid #eee;
  border-radius: 8px;
  padding: 15px;
  margin-bottom: 15px; 
}
.header{
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
  border-bottom: 1px solid #eee;
  padding-bottom: 5px;
}
.name{
  font-weight: bold;
  color: #333;
}
.time{
  color: #999;
  font-size: 14px;
}
.acontent{
  line-height: 1.6;
  color: #555;
}
.aaa {
  max-width: 1200px;
  margin: 28px auto;
  padding: 0 16px;
  font-size: 16px;
  line-height: 1.8;
}
.zong{
  gap:0px;
}
.shu{
  display: grid;
  grid-template-columns:repeat(4,1fr);
  grid-gap:15px;
  padding: 15px;
}
.heng{
  display: grid;
  grid-template-columns:repeat(2,1fr);
  grid-gap:15px;
  padding: 15px;
}
.a-item{
  aspect-ratio:2/3;
  background-color: #f5f5f5;
  border:none;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.b-item{
  aspect-ratio:3/2;
  background-color: #f5f5f5;
  border:none;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.b-item img,
.a-item img{
 height: 100%;
 width: 100%;
 object-fit: cover;
}