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

body {
  font: 12px / 1.5 "Microsoft YaHei", "Hiragino Sans GB", arial, simsun, sans-serif;
  color: #333;
}

a {
  text-decoration: none;
}

/* 模块标题 */
.module-title {
  font-weight: bold;
  font-size: 26px;
  color: #30363b;
  line-height: 37px;
  text-align: left;
  padding: 10px 0;
  border-bottom: 1px solid #e3e7eb;
  letter-spacing: 1px;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.module-title::before {
  content: "";
  display: block;
  width: 80px;
  height: 2px;
  background: #187dfe;
  position: absolute;
  left: 0;
  bottom: 0;
}

/* 更多链接 */
.more-link {
  font-size: 14px;
  color: #999;
  line-height: 20px;
  text-decoration: none;
  display: flex;
  align-items: center;
}

.more-link::after {
  content: "";
  display: inline-block;
  width: 22px;
  height: 22px;
  background: url(../image/icon_more.png) no-repeat;
  background-size: 100% 100%;
}

/* 查看更多 */
.look-more-link {
  font-size: 14px;
  color: #999999;
  text-decoration: none;
  cursor: pointer;
}

.look-more-link::after {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-left: 4px;
  background: url(../image/icon_triangle.png) no-repeat;
  background-size: 100% 100%;
}

/* Hero Banner */
.hero-banner {
  /* background: url(../image/banner_technical-topics.png) no-repeat center; */
  height: 440px;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  color: #fff;
  position: relative;
  overflow: hidden;
}

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

.hero-title {
  display: none;
  font-size: 52px;
  font-weight: bold;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
  letter-spacing: 2px;
}

.hero-subtitle {
  display: none;
  font-size: 18px;
  opacity: 0.9;
  position: relative;
  z-index: 1;
}

.hero-tabs {
  /* display: flex; */
  display: none;
  gap: 10px;
  margin-top: 30px;
  position: relative;
  z-index: 1;
}

.hero-tab {
  padding: 10px 25px;
  background-color: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s;
  color: #fff;
  font-size: 16px;
}

.hero-tab.active {
  background-color: #fff;
  color: #1e40af;
  font-weight: bold;
}

.hero-tab:hover {
  background-color: rgba(255, 255, 255, 0.3);
}

.top-content {
  position: relative;
}

/* 左侧知识导航 */
.knowledge-nav {
  background: linear-gradient(180deg, #39aaf4, #8554eb);
  box-shadow: 0px 0px 20px 0px rgba(4, 0, 0, 0.5);
  border-radius: 0px 10px 10px 0px;
  position: absolute;
  top: 0;
  z-index: 99;
}

/* 导航栏隐藏状态 */
.nav-items.hidden {
  opacity: 0;
  transform: translateX(-20px);
  width: 0;
  padding: 0;
  overflow: hidden;
}

.nav-items {
  padding: 20px 10px;
  transition: all 0.3s ease-in-out;
  opacity: 1;
  transform: translateX(0);
  width: 220px;
}

.knowledge-nav-title {
  color: #fff;
  font-size: 18px;
  padding: 20px 12px 14px;
  background: #8554eb;
  border-radius: 0px 10px 10px 0px;
  cursor: pointer;
  position: absolute;
  top: 20px;
  right: -48px;
  transition: all 0.3s ease;
}

.vertical-text {
  writing-mode: vertical-rl;
  letter-spacing: 2px;
  white-space: nowrap;
}

.menu-arrow {
  width: 24px;
  height: 24px;
  background: url(../image/icon_fold-up.png) no-repeat center;
  transition: transform 0.3s ease;
}

.menu-arrow.rotated {
  transform: rotate(180deg);
}

.nav-item-box {
  padding: 1px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.nav-item {
  display: flex;
  align-items: center;
  padding: 10px 18px 10px 8px;
  color: #fff;
  cursor: pointer;
  font-size: 16px;
  border-radius: 21px;
}

.nav-item:hover {
  background: #ffffff;
  color: #439ef3;
  font-weight: bold;
}

.nav-item.active {
  background: #ffffff;
  color: #439ef3;
  font-weight: bold;
}

.nav-item-icon {
  width: 20px;
  height: 20px;
  margin-right: 10px;
  background: url(../image/icon_special-topic.png) no-repeat center;
  border-radius: 3px;
}

.nav-item-text {
  flex: 1;
}

.nav-item-arrow {
  width: 16px;
  height: 16px;
  background: url(../image/icon_menu-arrow.png) no-repeat center;
}

/* 右侧内容区 */
.right-content {
  width: 1200px;
  margin: 24px auto;
}

.foreword-baike {
  display: flex;
  align-items: center;
}

/* 前言部分 */
.foreword {
  flex: 1;
  background: #f8fafd;
  border-radius: 4px;
  border: 1px solid #f1f2f4;
  padding: 24px 80px;
  position: relative;
  min-height: 144px;
}

.foreword-title {
  width: 100px;
  height: 100px;
  background: url(../image/icon_preface.png) no-repeat;
  position: absolute;
  top: 0;
  left: 0;
}

.foreword-content {
  text-indent: 2em;
  font-size: 16px;
  color: #333;
  line-height: 24px;
  letter-spacing: 1px;
  text-align: justify;
}

.expand-link {
  color: #187dfe;
  cursor: pointer;
  margin-left: 5px;
}

.expand-link:hover {
  text-decoration: underline;
}

/* 百科 */
.baike {
  width: 248px;
  margin-left: 40px;
  overflow: hidden;
}

.baike-logo {
  display: block;
  width: 157px;
  margin: 0 auto 10px;
}

.baike-logo img {
  height: auto;
  width: 100%;
}

.baike-search {
  display: flex;
  font-size: 0;
  height: 40px;
}

.baike-search input {
  border: 1px solid #409eff;
  border-radius: 4px;
  padding: 0 5px;
  font-size: 14px;
  width: 163px;
}

.baike-search input:focus-visible {
  outline: none;
}

.baike-search .search-btn {
  width: 85px;
  flex-shrink: 0;
  background: url(../image/word-bg_baike.gif) no-repeat;
  background-size: 100% 100%;
  margin-left: -7px;
  text-align: center;
  color: #fff;
  font-size: 14px;
  line-height: 40px;
  padding-left: 15px;
  cursor: pointer;
}

/* 精华推荐和精彩视频 */
.featured-section {
  margin: 24px 0 49px;
  display: flex;
  justify-content: space-between;
}

/* 精华推荐 */
.featured-box {
  width: 66%;
}

.featured-article {
  margin-top: 16px;
  display: flex;
  background: #f7f8fa;
  padding: 24px;
  cursor: pointer;
  border: 1px solid #d3d3d3;
}

.featured-article:nth-child(2n) {
  flex-direction: row-reverse;
}

.featured-article:nth-child(2n) .article-content {
  margin-right: 24px;
  margin-left: 0;
}

.article-image {
  width: 372px;
  height: 220px;
  border-radius: 4px;
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
  object-fit: cover;
}

.article-content {
  margin-left: 24px;
  overflow: hidden;
}

.article-title {
  font-weight: bold;
  color: #666;
  line-height: 24px;
  text-overflow: ellipsis;
  overflow: hidden;
  word-break: break-all;
  white-space: nowrap;
  transition: color 0.3s;
  font-size: 18px;
  margin-bottom: 10px;
}

.featured-article:hover .article-title {
  color: #187dfe;
}

.article-excerpt {
  font-size: 14px;
  word-break: break-all;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 6;
  -webkit-box-orient: vertical;
  text-indent: 2em;
  color: #333333;
  line-height: 24px;
  margin: 0;
  padding: 0;
}

/* 精彩视频和PPT */
.video-box {
  width: 32%;
  height: 630px;
  display: flex;
  flex-direction: column;
}

.video-content {
  flex: 1;
  overflow: hidden;
  border: 1px solid #d3d3d3;
  background: #f7f8fa;
  margin-top: 16px;
  padding: 34px 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.video-item {
  position: relative;
  cursor: pointer;
  height: 47%;
  width: 100%;
}

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

.video-thumbnail {
  width: 40px;
  height: 40px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: rgba(0, 0, 0, 0.6);
  background-image: url(../image/icon_video-play.png);
  background-repeat: no-repeat;
  background-position: center;
}

.video-title {
  width: 100%;
  background-color: rgba(0, 0, 0, 0.4);
  font-size: 14px;
  color: #ffffff;
  padding: 12px 20px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  word-break: break-all;
  position: absolute;
  left: 0;
  bottom: 0;
}

/* 国内国际新闻 */
.news-section {
  display: flex;
  position: relative;
  margin-bottom: 87px;
}

.bg-offset {
  content: '';
  display: block;
  width: calc(49% - 20px);
  height: 100%;
  background: #F7F8FA;
  position: absolute;
  top: 20px;
  left: 20px;
  z-index: -1;
}

.bg-offset2 {
  content: '';
  display: block;
  width: calc(49% - 20px);
  height: 100%;
  background: #F7F8FA;
  position: absolute;
  top: 20px;
  left: calc(51% + 20px);
  z-index: -1;
}

.news-box {
  width: calc(49% - 20px);
  padding: 24px 20px;
  background-color: #fff;
  border: 1px solid #D3D3D3;
  position: relative;
  z-index: 2;
}

.news-box:last-child {
  margin-left: calc(2% + 20px);
}

.news-box-title {
  font-size: 24px;
  color: #30363B;
  line-height: 29px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.news-box-title span::before {
  content: '';
  display: inline-block;
  width: 40px;
  height: 28px;
  vertical-align: bottom;
  background-color: #D3D3D3;
  margin-right: 10px;
  background: url(../image/icon_international.png) no-repeat;
  background-size: 100% 100%;
}

.news-list {
  margin-top: 22px;
  overflow: hidden;
}

.news-item {
  display: flex;
  align-items: center;
  padding: 10px 20px;
  background-color: #F7F8FA;
  cursor: pointer;
}

.news-item:nth-child(2n) {
  background-color: transparent;
}

.news-icon {
  padding: 2px 6px;
  background: linear-gradient(180deg, #167CFF, #9DC8FE);
  border-radius: 4px;
  font-size: 12px;
  color: #FFFFFF;
  margin-right: 6px;
}

.news-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  overflow: hidden;
}

.news-date {
  font-size: 14px;
  color: #187DFE;
  min-width: 70px;
  text-align: right;
}

.news-title {
  font-size: 14px;
  color: #333;
  padding-right: 8px;
  flex: 1;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  word-break: break-all;
}

.news-item:hover .news-title {
  color: #187dfe;
}

/* 技术前沿 */
.tech-frontier {
  width: 100%;
  /* margin: 20px 0 0; */
  padding: 40px 0 72px;
  background-color: #F6FAFE;
}

.tech-content {
  max-width: 1200px;
  margin: 0 auto;
  overflow: hidden;
}

.section-title {
  font-size: 24px;
  color: #30363B;
  line-height: 29px;
  text-align: center;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid #e3e7eb;
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 2px;
  background-color: #187DFE;
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
}

.tech-carousel-swiper {
  width: 100%;
  position: relative;
  height: 255px;
}

.tech-carousel-swiper .swiper-button-prev {
  left: 0;
}

.tech-carousel-swiper .swiper-button-next  {
  right: 0;
}

.tech-carousel-swiper .swiper-button-prev::before {
  content: '';
  display: block;
  width: 36px;
  height: 50px;
  background: url(../image/icon_swiper-prev.png) no-repeat;
  background-size: 100% 100%;
}

.tech-carousel-swiper .swiper-button-next::before {
  content: '';
  display: block;
  width: 36px;
  height: 50px;
  background: url(../image/icon_swiper-next.png) no-repeat;
  background-size: 100% 100%;
}

.tech-carousel-swiper .swiper-button-prev,
.tech-carousel-swiper .swiper-button-next {
  width: 36px;
}

.tech-carousel-swiper .swiper-button-prev svg,
.tech-carousel-swiper .swiper-button-next svg {
  display: none;
}

.tech-carousel {
  overflow: hidden;
}

.tech-card {
  display: block;
}

.tech-card img {
  width: 100%;
  height: 100%;
  /* object-fit: cover; */
}

.tech-card-title {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(17, 94, 194, 0.8);
  padding: 15px 20px;
  max-height: 86px;
  transition: all 0.3s;
}

.card-title {
  color: #fff;
  font-size: 18px;
  font-weight: bold;
  line-height: 28px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.tech-card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(17, 94, 194, 0.8);
  color: #fff;
  padding: 20px;
  display: none;
  z-index: 10;
}

.tech-card:hover .tech-card-overlay {
  display: block;
}

.tech-card:hover .tech-card-title {
  display: none;
}

.tech-card-overlay-title {
  font-weight: bold;
  font-size: 18px;
  color: #FFFFFF;
  line-height: 28px;
  margin-bottom: 10px;
  height: 84px;
  word-break: break-all;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
}

.tech-card-overlay-text {
  font-size: 14px;
  color: #FFFFFF;
  line-height: 24px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 5;
  -webkit-box-orient: vertical;
}

/* 专利及其他 */
.patents-section {
  width: 100%;
  padding: 0 0 80px;
  /* padding: 20px 0 40px; */
  background-color: #FDFEFF;
}

.patents-content {
  margin: 0 auto;
  max-width: 1200px;
}

.patents-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.patents-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.patent-item {
  width: 49%;
  padding: 20px 10px;
  border-bottom: 1px dashed #E9ECEE;
  display: flex;
  align-items: center;
}

.patent-date-wrapper {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  border-radius: 4px;
  border: 1px solid #187DFE;
}

.patent-day {
  background-color: rgba(24, 125, 254, 0.8);
  color: #fff;
  padding: 2px 6px;
  font-size: 12px;
  border-radius: 3px 0 0 3px;
}

.patent-year {
  background-color: #fff;
  color: #666666;
  padding: 2px 6px;
  font-size: 12px;
  border-radius: 0 3px 3px 0;
}

.patent-country {
  display: inline-block;
  color: #187DFE;
  font-size: 14px;
  line-height: 14px;
  flex-shrink: 0;
  padding: 0 10px;
}

.patent-line {
  display: inline-block;
  width: 1px;
  height: 14px;
  background-color: #187DFE;
}

.patent-title {
  font-size: 14px;
  color: #333;
  transition: color 0.3s;
  flex: 1;
  padding-left: 10px;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  word-break: break-all;
}

.patent-item:hover .patent-title {
  color: #187dfe;
}

/* 调研汇编和热点技术横向排列 */
.research-hot-tech-wrapper {
  background: url(../image/bg_technical-preface.png) no-repeat right center;
}

.research-hot-tech-wrapper .module-title,
.research-hot-tech-wrapper .more-link {
  color: #fff;
}

.research-hot-tech-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 15px 0;
  display: flex;
  justify-content: space-between;
}

/* 调研汇编 */
.research-section {
  width: 64%;
}

.research-grid {
  display: flex;
  justify-content: space-between;
  margin-top: 16px;
}

.research-item {
  width: 23.5%;
  overflow: hidden;
}

.research-image {
  width: 100%;
  height: 220px;
}

.research-image img {
  width: 100%;
  height: 100%;
  border-radius: 5px;
}

.research-title {
  margin: 10px 0 24px;
  height: 40px;
  font-size: 14px;
  color: #fff;
  line-height: 20px;
  transition: color 0.3s;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.research-item:hover .research-title {
  color: #187dfe;
}

/* 热点技术 */
.hot-tech-section {
  width: 32%;
  height: 286px;
}

/* .hot-tech-section .module-title {
  border-bottom: 0;
} */

.hot-tech-container {
  position: relative;
  width: 100%;
  height: 286px;
  overflow: hidden;
  /* background: url(../image/bg_hot-tech.png) no-repeat;
  background-size: 100% 100%;
  background-color: #F6FAFE; */
}

.hot-tech-item {
  position: absolute;
  font-weight: bold;
  white-space: nowrap;
  cursor: pointer;
}