* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Microsoft YaHei", sans-serif;
  background: #fff9f5;
  padding: 20px;
  max-width: 900px;
  margin: 0 auto;
  color: #333;
  line-height: 1.7;
}

.nav {
  display: flex;
  gap: 12px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.nav-btn {
  padding: 10px 22px;
  background: #f8e1e4;
  border-radius: 50px;
  cursor: pointer;
  transition: 0.3s;
  font-weight: 500;
}

.nav-btn.on {
  background: #e97a91;
  color: #fff;
}

.nav-btn:hover {
  background: #f5ccd1;
}

.box {
  background: #fff;
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
  margin-bottom: 20px;
  animation: fade 0.3s ease;
}

@keyframes fade {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

h1 {
  color: #e97a91;
  margin-bottom: 20px;
  font-size: 24px;
}

h3 {
  margin: 24px 0 12px;
  color: #555;
  font-size: 18px;
}

p {
  margin-bottom: 10px;
  text-align: justify;
}

b {
  color: #d96177;
}

img {
  max-width: 100%;
  border-radius: 10px;
  margin-top: 20px;
  display: block;
}

.footer-beian {
  margin-top: 40px;
  text-align: center;
  font-size: 14px;
  color: #666;
}

.footer-beian a {
  color: #666;
  text-decoration: none;
}

.footer-beian a:hover {
  color: #e97a91;
  text-decoration: underline;
}

.footer-beian span {
  margin: 0 6px;
  color: #999;
}