/* 全局样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.7;
  color: #2b2b2b;
  background-color: #fff;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* 顶部导航区 */
.site-header {
  background-color: #0066CC;
  color: white;
}

.top-info {
  padding: 15px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.top-info .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 15px;
}

.logo {
  height: 60px;
  width: auto;
}

.brand-text h1 {
  font-size: 24px;
  font-weight: bold;
  margin-bottom: 5px;
}

.brand-text p {
  font-size: 12px;
  opacity: 0.8;
}

.top-search {
  display: flex;
  gap: 10px;
}

.top-search input {
  padding: 8px 15px;
  border: none;
  border-radius: 4px;
  width: 300px;
  font-size: 14px;
}

.search-btn {
  padding: 8px 20px;
  background-color: #004499;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  transition: background-color 0.3s;
}

.search-btn:hover {
  background-color: #003366;
}

/* 主导航栏 */
.main-nav {
  background-color: rgba(0, 102, 204, 0.9);
}

.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  justify-content: center;
  width: 100%;
}

.nav-menu > li {
  position: relative;
  flex: 1;
  text-align: center;
}

.nav-menu > li > a {
  display: block;
  padding: 15px 25px;
  color: white;
  text-decoration: none;
  font-size: 16px;
  transition: background-color 0.25s, transform 0.2s;
}

.nav-menu > li > a:hover,
.nav-menu > li:hover > a {
  background-color: rgba(255, 255, 255, 0.12);
  transform: translateY(-1px);
}

/* 下拉菜单 */
.nav-menu .has-dropdown .dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: white;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  border-radius: 4px;
  padding: 20px;
  min-width: 600px;
  display: none;
  z-index: 1000;
  gap: 30px;
  opacity: 0;
  transform: translateY(8px);
  transition: all 0.3s ease-in-out;
}

.nav-menu .has-dropdown:hover .dropdown {
  display: flex;
  opacity: 1;
  transform: translateY(0);
}

.dropdown-section h3 {
  color: #0066CC;
  font-size: 14px;
  margin-bottom: 10px;
  padding-bottom: 5px;
  border-bottom: 2px solid #0066CC;
}

.dropdown-section ul {
  list-style: none;
}

.dropdown-section ul li {
  margin-bottom: 8px;
}

.dropdown-section ul li a {
  color: #333;
  text-decoration: none;
  font-size: 13px;
  padding: 5px 0;
  display: block;
  transition: color 0.3s;
}

.dropdown-section ul li a:hover {
  color: #0066CC;
}

/* 核心功能区 */
.hero-section {
  position: relative;
  height: 300px;
  overflow: hidden;
}

.hero-bg {
  background-image: url('../../../img/背景图.jpg');
  background-size: cover;
  background-position: center;
  height: 100%;
  position: relative;
}

.hero-bg::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
}

.hero-bg .container {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-tabs {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  min-width: 500px;
}

.tab-buttons {
  display: flex;
  margin-bottom: 20px;
  border-bottom: 1px solid #eee;
}

.tab-btn {
  flex: 1;
  padding: 12px 20px;
  border: none;
  background: none;
  color: #666;
  font-size: 16px;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all 0.3s;
}

.tab-btn.active {
  color: #0066CC;
  border-bottom-color: #0066CC;
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

.search-form {
  display: flex;
  gap: 10px;
}

.search-form input {
  flex: 1;
  padding: 12px 15px;
  border: 2px solid #ddd;
  border-radius: 4px;
  font-size: 16px;
}

.search-form input:focus {
  outline: none;
  border-color: #0066CC;
}

.search-form .search-btn {
  padding: 12px 30px;
  font-size: 16px;
}

/* 主内容区 */
.main-content {
  padding: 30px 0;
  background-color: #f8f9fa;
}

/* 电子资源和常用服务 */
.resources-services {
  margin-bottom: 30px;
}

.section-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.section-block {
  background: white;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.section-block h2 {
  color: #0066CC;
  font-size: 24px;
  margin-bottom: 25px;
  padding-bottom: 10px;
  border-bottom: 3px solid #0066CC;
}

.resource-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.resource-category h3 {
  color: #333;
  font-size: 16px;
  margin-bottom: 15px;
  padding: 10px;
  background-color: #f5f5f5;
  border-radius: 4px;
}

.resource-list {
  list-style: none;
}

.resource-list li {
  margin-bottom: 8px;
}

.resource-list li a {
  color: #666;
  text-decoration: none;
  font-size: 14px;
  padding: 5px 10px;
  display: block;
  border-radius: 4px;
  transition: all 0.3s;
}

.resource-list li a:hover {
  background-color: #e6f3ff;
  color: #0066CC;
}

/* 常用服务网格 */
.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.service-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px 10px;
  background-color: #f8f9fa;
  border-radius: 8px;
  text-align: center;
  transition: all 0.3s;
  cursor: pointer;
}

.service-item:hover {
  background-color: #e6f3ff;
  transform: translateY(-2px);
}

.service-icon {
  font-size: 24px;
  margin-bottom: 10px;
  color: #666;
}

.service-item span {
  font-size: 14px;
  color: #333;
}

/* 最新消息 */
.news-section {
  background: white;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  margin-bottom: 25px;
}

.news-section h2 {
  color: #0066CC;
  font-size: 22px;
  margin-bottom: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.more-link {
  font-size: 14px;
  color: #666;
  cursor: pointer;
  transition: color 0.3s;
}

.more-link:hover {
  color: #0066CC;
}

.news-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.news-carousel {
  position: relative;
}

.carousel-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 8px;
}

.carousel-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
  color: white;
  padding: 30px 20px 20px;
  border-radius: 0 0 8px 8px;
}

.carousel-caption h3 {
  font-size: 16px;
  line-height: 1.4;
}

.news-tabs {
  display: flex;
  flex-direction: column;
}

.tab-headers {
  display: flex;
  border-bottom: 1px solid #eee;
  margin-bottom: 20px;
}

.tab-header {
  padding: 12px 20px;
  border: none;
  background: none;
  color: #666;
  font-size: 16px;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: all 0.3s;
}

.tab-header.active {
  color: #0066CC;
  border-bottom-color: #0066CC;
}

.news-list {
  list-style: none;
}

.news-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid #f0f0f0;
}

.news-list li:last-child {
  border-bottom: none;
}

.news-list li a {
  color: #333;
  text-decoration: none;
  font-size: 14px;
  flex: 1;
  transition: color 0.3s;
}

.news-list li a:hover {
  color: #0066CC;
}

.news-list .date {
  color: #999;
  font-size: 12px;
  margin-left: 10px;
}

/* 图书荐读 */
.books-section {
  background: white;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  margin-bottom: 25px;
}

.books-section h2 {
  color: #0066CC;
  font-size: 22px;
  margin-bottom: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  letter-spacing: 0.3px;
}

.books-carousel {
  position: relative;
  display: flex;
  align-items: center;
  gap: 20px;
}

.carousel-prev,
.carousel-next {
  background: #0066CC;
  color: white;
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  font-size: 20px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.carousel-prev:hover,
.carousel-next:hover {
  background: #004499;
}

.books-container {
  flex: 1;
  display: flex;
  gap: 20px;
  overflow: hidden;
}

.book-card {
  position: relative;
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  border-radius: 12px;
  padding: 25px;
  min-width: 300px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s;
}

.book-card:hover {
  transform: translateY(-5px);
}

.book-card.active {
  transform: scale(1.02);
}

.book-cover {
  width: 80px;
  height: 100px;
  margin-bottom: 15px;
  border-radius: 4px;
  overflow: hidden;
}

.book-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.book-info h3 {
  font-size: 16px;
  color: #333;
  margin-bottom: 10px;
  line-height: 1.4;
}

.book-desc {
  font-size: 14px;
  color: #666;
  margin-bottom: 10px;
  line-height: 1.4;
}

.book-date {
  font-size: 12px;
  color: #999;
}

.vine-decoration {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 30px;
  height: 30px;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="%2328a745"><path d="M12 2C6.48 2 2 6.48 2 12s4.48 10 10 10 10-4.48 10-10S17.52 2 12 2zm-2 15l-5-5 1.41-1.41L10 14.17l7.59-7.59L19 8l-9 9z"/></svg>') no-repeat center;
  background-size: contain;
}

/* 底部信息区 */
.site-footer {
  background-color: #333;
  color: white;
  padding: 30px 0 15px;
  position: relative;
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 30px;
  align-items: start;
}

.footer-info {
  display: flex;
  gap: 30px;
}

.footer-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.footer-logo img {
  height: 50px;
  margin-bottom: 10px;
}

.footer-logo h3 {
  font-size: 18px;
  margin-bottom: 5px;
}

.footer-logo p {
  font-size: 12px;
  opacity: 0.8;
}

.contact-info {
  flex: 1;
}

.contact-info p {
  margin-bottom: 8px;
  font-size: 14px;
  opacity: 0.9;
}

.footer-qr {
  text-align: center;
}

.footer-qr img {
  width: 80px;
  height: 80px;
  border-radius: 8px;
  margin-bottom: 8px;
}

.footer-qr p {
  font-size: 14px;
  opacity: 0.9;
}

.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  background: #0066CC;
  color: white;
  border: none;
  padding: 12px 20px;
  border-radius: 25px;
  cursor: pointer;
  font-size: 14px;
  box-shadow: 0 4px 12px rgba(0, 102, 204, 0.3);
  transition: all 0.3s;
  z-index: 1000;
}

.back-to-top:hover {
  background: #004499;
  transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    padding: 0 15px;
  }
  
  .top-info .container {
    flex-direction: column;
    gap: 15px;
  }
  
  .top-search input {
    width: 250px;
  }
  
  .nav-menu {
    flex-direction: column;
  }
  
  .dropdown {
    position: static;
    display: block;
    min-width: auto;
    box-shadow: none;
    background: rgba(255, 255, 255, 0.95);
    margin-top: 10px;
  }
  
  .section-row {
    grid-template-columns: 1fr;
  }
  
  .news-content {
    grid-template-columns: 1fr;
  }
  
  .service-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .resource-grid {
    grid-template-columns: 1fr;
  }
  
  .books-container {
    flex-direction: column;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-info {
    flex-direction: column;
    align-items: center;
  }
}