body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #f4f6fa;
  color: #333;
  line-height: 1.6;
}

/* 顶部导航 */
.navbar {
  /*background: #fff;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);*/
  padding: 0.8rem 2rem;
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  z-index: 1000;
}
.navbar-brand {
  font-weight: 700;
  font-size: 1.5rem;
  color: #4f46e5;
}
.nav-link {
  font-weight: 500;
  color: #333 !important;
  border-radius: 10px;
  padding: 0.5rem 1rem !important;
}
.nav-link:hover {
  background: #eef2ff;
  color: #4f46e5 !important;
}

/* Hero */
.hero {
  padding: 140px 20px 80px 20px;
  text-align: center;
  background: linear-gradient(135deg, #4f46e5, #3b82f6);
  color: #fff;
}
.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 15px;
}
.hero p {
  font-size: 1.2rem;
  margin-bottom: 30px;
}

/* 搜索区 */
#searchForm {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 20px;
}
#searchForm select,
#searchForm input {
  padding: 10px 15px;
  height: 50px;
  font-size: 16px;
  border: none;
}
#searchForm select:first-child { border-radius: 50px 0 0 50px; }
#searchForm input { flex:1; border-radius: 0; }
#searchForm button {
  border-radius: 0 50px 50px 0;
  padding: 10px 25px;
  font-size: 16px;
  background-color: #fff;
  color: #4f46e5;
  font-weight: 600;
  border: none;
  transition: all 0.3s;
}
#searchForm button:hover {
  background-color: #eef2ff;
  transform: scale(1.05);
}

/* 提示框 */
#messageBox {
  max-width: 800px;
  margin: 20px auto;
  display: none;
}

/* 联想搜索结果 */
.autocomplete-container {
  max-width: 800px;
  margin: 20px auto;
}
.accordion-button {
  font-weight: 500;
}

/* Footer */
footer {
  background: #fff;
  color: #555;
  padding: 40px 20px;
  border-top: 1px solid #eaeaea;
  margin-top: 40px;
}
footer .footer-bottom {
  border-top: 1px solid #eaeaea;
  margin-top: 20px;
  padding-top: 15px;
  text-align: center;
  font-size: 0.9rem;
  color: #777;
}