* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Microsoft YaHei", sans-serif;
}
:root {
  --yz-primary: #0056b3;
  --yz-light: #e6f0fa;
  --yz-dark: #003d7a;
  --white: #fff;
  --gray: #f5f7fa;
}
body {
  background: var(--gray);
  color: #333;
  line-height: 1.6;
}
/* 导航栏 */
.navbar {
  background: var(--yz-primary);
  padding: 15px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
}
.logo {
  color: white;
  font-size: 24px;
  font-weight: bold;
}
.nav-menu {
  display: flex;
  list-style: none;
  gap: 25px;
}
.nav-menu a {
  color: white;
  text-decoration: none;
  transition: 0.3s;
}
.nav-menu a:hover, .nav-menu a.active {
  color: #ffd700;
  font-weight: bold;
}
/* 横幅 */
.banner {
  height: 300px;
  background: linear-gradient(rgba(0,86,179,0.85), rgba(0,61,122,0.9));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-align: center;
}
.banner h1 {
  font-size: 40px;
  margin-bottom: 10px;
}
/* 通用容器 */
.container {
  max-width: 1200px;
  margin: 40px auto;
  padding: 0 20px;
}
.section-title {
  text-align: center;
  color: var(--yz-primary);
  font-size: 32px;
  margin-bottom: 30px;
  position: relative;
}
.section-title::after {
  content: '';
  width: 80px;
  height: 4px;
  background: var(--yz-primary);
  display: block;
  margin: 10px auto;
  border-radius: 2px;
}
/* 卡片通用样式 */
.card {
  background: white;
  border-radius: 10px;
  padding: 25px;
  margin-bottom: 30px;
  box-shadow: 0 3px 15px rgba(0,0,0,0.05);
  transition: 0.3s;
}
.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}
/* 成员卡片网格 */
.member-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
  margin: 20px 0;
}
.member-card {
  text-align: center;
  padding: 20px;
}
.member-card img {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 15px;
  border: 3px solid var(--yz-light);
}
/* 相册样式 */
.album-category {
  margin: 40px 0;
}
.album-category h3 {
  color: var(--yz-primary);
  margin-bottom: 15px;
  border-left: 4px solid var(--yz-primary);
  padding-left: 12px;
  font-size: 22px;
}
.album-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 15px;
}
.album-grid img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: 8px;
  transition: 0.3s;
  cursor: pointer;
}
.album-grid img:hover {
  transform: scale(1.05);
}
/* 留言墙样式 */
.message-input-wrap {
  margin-bottom: 30px;
}
.name-input {
  width: 300px;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  margin-bottom: 15px;
  font-size: 16px;
}
.message-input {
  width: 100%;
  padding: 15px;
  border: 1px solid #ddd;
  border-radius: 8px;
  margin-bottom: 15px;
  resize: none;
  font-size: 16px;
  min-height: 120px;
}
.submit-btn {
  background-color: var(--yz-primary);
  color: white;
  border: none;
  padding: 12px 30px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 16px;
  transition: 0.3s;
}
.submit-btn:hover {
  background-color: var(--yz-dark);
}
.message-item {
  background: var(--yz-light);
  padding: 18px;
  border-radius: 8px;
  margin-bottom: 15px;
}
.message-name {
  font-weight: bold;
  color: var(--yz-primary);
  margin-bottom: 6px;
}
.message-time {
  font-size: 12px;
  color: #666;
  margin-top: 8px;
}
/* 活动时间线 */
.timeline {
  position: relative;
  padding-left: 35px;
  border-left: 2px solid var(--yz-primary);
  margin: 20px 0;
}
.timeline-item {
  position: relative;
  margin-bottom: 35px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -44px;
  top: 0;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--yz-primary);
  border: 3px solid white;
}
.timeline-item h3 {
  color: var(--yz-primary);
  margin-bottom: 8px;
}
.timeline-time {
  font-size: 14px;
  color: #666;
  margin-bottom: 10px;
}
/* 联系表单 */
.contact-form .form-group {
  margin-bottom: 18px;
}
.contact-form label {
  display: block;
  margin-bottom: 6px;
  font-weight: bold;
}
.contact-form input, .contact-form textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 16px;
}
.contact-info p {
  margin-bottom: 12px;
  font-size: 16px;
}
/* 页脚 */
.footer {
  background: var(--yz-dark);
  color: white;
  text-align: center;
  padding: 30px 0;
  margin-top: 50px;
}
/* 手机端响应式适配 */
@media (max-width: 768px) {
  .nav-menu {
    gap: 12px;
    font-size: 14px;
    flex-wrap: wrap;
    justify-content: center;
  }
  .nav-container {
    flex-direction: column;
    gap: 10px;
  }
  .banner h1 {
    font-size: 30px;
  }
  .member-grid, .album-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .name-input {
    width: 100%;
  }
}