/* ==========================================================================
   全局通用规范与重设 (Global Standards)
   ========================================================================== */
html,
body {
  font-size: 16px; /* 全局最小字体大小不得低于 16px */
  line-height: 1.6;
  color: #1a1a1a;
  background-color: #ffffff;
  max-width: 1920px;
  margin: 0 auto;
}

body,
button,
input,
select,
textarea,
p,
span,
a,
div {
  font-size: 16px; /* 强制全局文本不得低于 16px */
}

/* 文本对齐规范：所有卡片文案、列表内容、描述文本默认采用左上方对齐 */
.card-body,
.content-body {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  text-align: left;
}

/* 图片比例规范：内容卡片统一 3:2 比例 */
.card-img-wrapper,
.slide-img-wrapper {
  width: 100%;
  aspect-ratio: 3 / 2;
  overflow: hidden;
}

.card-img-wrapper img,
.slide-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ==========================================================================
   页面容器与 Header 区域
   ========================================================================== */
.container {
  width: 100%;
  min-height: 100vh;
  margin: 0 auto;
  position: relative;
  overflow-x: hidden;
}

.header {
  width: 100%;
  position: relative;
  background-color: #c97945;
  overflow: hidden;
}

/* Banner 容器与自适应排版 */
.banner-wrapper {
  position: relative;
  width: 100%;
  overflow: hidden;
  line-height: 0;
  background-color: #c97945;
}

/* Banner 图片：自小而大、从模糊到清晰出现 */
.banner-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  transform-origin: center center;
  animation: bannerZoomIn 1.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  will-change: transform, filter, opacity;
}

@keyframes bannerZoomIn {
  0% {
    transform: scale(0.86);
    filter: blur(22px);
    opacity: 0;
  }
  40% {
    opacity: 0.75;
  }
  100% {
    transform: scale(1);
    filter: blur(0);
    opacity: 1;
  }
}

/* ==========================================================================
   Hero 标题组精确定位与入场特效 (基于视图宽度自适应缩放)
   ========================================================================== */
.hero-titles {
  position: absolute;
  top: 24%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  /* 纯流式视图宽度布局，完全随视口宽度等比缩放 */
  width: 48vw;
  max-width: 1050px;
  pointer-events: none;
}

.hero-title-item {
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
}

/* 装饰折线线条 (hero-title-3) */
.title-decor {
  width: 67%;
  margin: 0 auto;
  margin-top: -5%;
}

.title-img-decor {
  width: 100%;
  height: auto;
  display: block;
  transform-origin: left center;
  /* 延迟 1.25s 像光线轨迹般从左向右伸展 */
  animation: titleDecorExpand 1.1s cubic-bezier(0.22, 1, 0.36, 1) 1.25s both;
  filter: drop-shadow(0 0 0.4vw rgba(246, 187, 67, 0.5));
}

@keyframes titleDecorExpand {
  0% {
    opacity: 0;
    clip-path: inset(0 100% 0 0);
    transform: translateX(-1vw);
  }
  30% {
    opacity: 1;
  }
  100% {
    opacity: 1;
    clip-path: inset(0 0 0 0);
    transform: translateX(0);
  }
}

/* 主英文标题 (hero-title-1: CHINA RAILWAY EXPRESS) */
.title-main {
  width: 90%;
  margin-bottom: 0.8vw;
}

.title-img-main {
  width: 100%;
  height: auto;
  display: block;
  /* 延迟 0.75s 从上方淡入浮降 */
  animation: titleMainFlyIn 1s cubic-bezier(0.18, 0.9, 0.28, 1) 0.75s both;
  /* filter: drop-shadow(0 0.4vw 0.8vw rgba(0, 0, 0, 0.35)); */
}

@keyframes titleMainFlyIn {
  0% {
    opacity: 0;
    transform: translateY(-2vw) scale(0.95);
    /* filter: blur(8px) drop-shadow(0 0 0 rgba(0, 0, 0, 0)); */
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
    /* filter: blur(0) drop-shadow(0 0.4vw 0.8vw rgba(0, 0, 0, 0.35)); */
  }
}

/* 副英文标题 (hero-title-2: POWERS OPENING-UP OF XI'AN) */
.title-sub {
  width: 100%;
  margin-bottom: 0;
}

.title-img-sub {
  width: 100%;
  height: auto;
  display: block;
  /* 延迟 1.0s 从下方淡入平稳托起 */
  animation: titleSubFlyIn 1s cubic-bezier(0.18, 0.9, 0.28, 1) 1s both;
  filter: drop-shadow(0 0.3vw 0.6vw rgba(0, 0, 0, 0.45))
    drop-shadow(0 0 1.5px rgba(255, 255, 255, 0.65));
}

@keyframes titleSubFlyIn {
  0% {
    opacity: 0;
    transform: translateY(2vw) scale(0.96);
    filter: blur(6px) drop-shadow(0 0 0 rgba(0, 0, 0, 0));
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: drop-shadow(0 0.3vw 0.6vw rgba(0, 0, 0, 0.45))
      drop-shadow(0 0 1.5px rgba(255, 255, 255, 0.65));
  }
}

/* ==========================================================================
   响应式布局断点规范 (Responsive Breakpoints)
   ========================================================================== */

/* ==========================================================================
   Content 模块 - item1 (UPDATES 专栏)
   ========================================================================== */
.content {
  width: 100%;
  position: relative;
}

.content-item-1 {
  width: 100%;
  background: linear-gradient(35deg, #c4723c, #e5a77e, #c4723c);
  padding: 56px 0 76px;
  position: relative;
  overflow: hidden;
}

.content-inner {
  width: 92%;
  max-width: 1320px;
  margin: 0 auto;
}

/* 栏目标题栏 (Section Header - 带滚动入场动效) */
.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  padding-bottom: 26px;
  position: relative;
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.75s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.75s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.content-item.in-view .section-header {
  opacity: 1;
  transform: translateY(0);
}

.section-title-wrap {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  position: relative;
  cursor: pointer;
}

.decor-arc-dots {
  display: block;
  margin-bottom: -6px;
  transform-origin: left bottom;
  transition: transform 0.3s ease;
}

.section-title-wrap:hover .decor-arc-dots {
  transform: scale(1.06);
}

.section-title {
  margin: 0;
  line-height: 1.1;
}

/* 栏目标题规范：包裹 <a> 并具备 Hover 效果（文字上浮、主题色切换、下划线伸展） */
.section-title-link {
  font-family: "Georgia", "Times New Roman", "Source Sans 3", serif;
  font-size: 38px;
  font-weight: 700;
  letter-spacing: 2px;
  color: #822008;
  display: inline-block;
  transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.section-title-link:hover,
.section-title-wrap:hover .section-title-link {
  color: #f5c208;
  transform: translateY(-3px);
}

.title-bottom-bar {
  width: 140px;
  height: 4px;
  background: linear-gradient(90deg, #7e1e06 0%, #f5c208 100%);
  margin-top: 8px;
  border-radius: 2px;
  transition: all 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.section-title-wrap:hover .title-bottom-bar {
  width: 200px;
  background: linear-gradient(90deg, #c37846 0%, #ffd97a 100%);
  box-shadow: 0 0 12px rgba(245, 194, 8, 0.65);
}

/* 栏目标题图片（替换原文字标题；宽度按栏目头部百分比自适应，负边距按图片留白比例裁去上下透明区域） */
.section-title-wrap--img {
  width: 50%;
}

.section-title-img {
  display: block;
  width: 100%;
  height: auto;
  margin-top: -8.2%;
  margin-bottom: -9.5%;
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.section-title-wrap:hover .section-title-img {
  transform: translateY(-3px);
}

/* 更多链接区域 */
.section-more-wrap {
  display: flex;
  align-items: center;
  gap: 16px;
}

.decor-dots {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.dot-square {
  width: 6px;
  height: 6px;
  border-radius: 1px;
  display: inline-block;
  /* 持续性交错波浪跳动与流光微动效 */
  animation: dotPulseWave 1.6s ease-in-out infinite;
  will-change: transform, opacity, box-shadow;
}

.dot-cyan {
  background-color: #f6260f;
  color: #f6260f;
  animation-delay: 0s;
}

.dot-green {
  background-color: #19a8a4;
  color: #19a8a4;
  animation-delay: 0.22s;
}

.dot-purple {
  background-color: #7a524b;
  color: #7a524b;
  animation-delay: 0.44s;
}

.dot-orange {
  background-color: #ffa860;
  color: #ffa860;
  animation-delay: 0.66s;
}

@keyframes dotPulseWave {
  0%,
  100% {
    transform: translateY(0) scale(1);
    opacity: 0.45;
    /* box-shadow: 0 0 0 rgba(255, 255, 255, 0); */
  }
  30% {
    transform: translateY(-4px) scale(1.35);
    opacity: 1;
    /* box-shadow: 0 0 8px currentColor; */
  }
  60% {
    transform: translateY(0) scale(1);
    opacity: 0.65;
  }
}

/* 鼠标悬停在 MORE 区域时，微动效加速响应 */
.section-more-wrap:hover .dot-square {
  animation-duration: 0.9s;
}

.section-more-link {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 1.5px;
  color: #ffffff;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.25s ease;
}

.section-more-link:hover {
  color: #7e1e06;
  transform: translateX(4px);
}

/* ==========================================================================
   UPDATES 三列主体布局
   ========================================================================== */
.updates-layout {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 26px;
  width: 100%;
}

/* 左列：Swiper 轮播图容器 (约占 47%) */
.updates-col-swiper {
  flex: 0 0 47%;
  max-width: 47%;
  min-width: 0;
  display: flex;
}

/* 规则要求：Swiper 轮播图配置 CSS touch-action 与 -webkit-user-drag */
.swiper-container,
.swiper-slide {
  touch-action: pan-y;
  -webkit-user-drag: none;
}

.swiper-updates {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
  border-radius: 4px;
  box-shadow: 0 8px 24px rgba(0, 10, 30, 0.35);
}

.swiper-updates .swiper-slide {
  height: auto;
  position: relative;
}

.slide-card-link {
  display: block;
  position: relative;
  width: 100%;
  height: 100%;
  text-decoration: none;
}

/* 规则要求：统一 3:2 宽高比例 */
.slide-img-wrapper {
  width: 100%;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  position: relative;
}

.slide-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.slide-card-link:hover .slide-img-wrapper img {
  transform: scale(1.04);
}

/* 幻灯片底部覆盖蒙层与文字 (左上方对齐，字号>=16px) */
.slide-overlay {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  padding: 30px 20px 18px;
  background: linear-gradient(
    180deg,
    rgba(72, 28, 1, 0) 0%,
    rgba(35, 24, 0, 0.6) 40%,
    rgba(40, 24, 0, 0.92) 100%
  );
  z-index: 2;
}

.slide-title {
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
  color: #ffffff;
  margin: 0;
  transition: color 0.25s ease;
}

.slide-card-link:hover .slide-title {
  color: #f5c208;
}

/* 自定义 Swiper 左右切换按钮 */
.swiper-btn-custom {
  width: 48px;
  height: 48px;
  background: rgba(0, 20, 50, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  top: 50%;
  transform: translateY(-50%);
  margin-top: 0;
  cursor: pointer;
  transition: all 0.25s ease;
  backdrop-filter: blur(4px);
  z-index: 10;
}

.swiper-btn-custom:hover {
  background: rgba(247, 146, 4, 0.55);
  color: #ffffff;
}

.swiper-button-prev.swiper-btn-custom {
  left: 10px;
}

.swiper-button-next.swiper-btn-custom {
  right: 10px;
}

/* 中列：焦点单图卡片 (约占 25%) */
.updates-col-middle {
  flex: 0 0 25%;
  max-width: 25%;
  min-width: 0;
  display: flex;
}

.feature-card-link {
  display: flex;
  flex-direction: column;
  width: 100%;
  text-decoration: none;
}

.card-inner {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
}

/* 中列单图卡片图片同样严格保持 3:2 宽高比 */
.card-img-wrapper {
  width: 100%;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: 4px;
  box-shadow: 0 6px 18px rgba(0, 10, 30, 0.3);
}

.card-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.feature-card-link:hover .card-img-wrapper img {
  transform: scale(1.05);
}

.feature-card-body {
  padding-top: 18px;
  flex: 1;
}

.feature-title {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.45;
  color: #ffffff;
  margin: 0;
  transition: all 0.25s ease;
}

.feature-card-link:hover .feature-title {
  color: #7e1e06;
  transform: translateY(-2px);
}

/* 右列：新闻列表 (严格左上方对齐规范，避免下沉) */
.updates-col-news {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: flex-start;
}

.news-list-wrap {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: flex-start;
  width: 100%;
}

.news-item {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  text-align: left;
  padding: 0 0 22px 0;
  margin-bottom: 22px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.news-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.news-item-link {
  color: #ffffff;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.45;
  display: block;
  text-decoration: none;
  transition: all 0.25s ease;
}

.news-item-link:hover {
  color: #7e1e06;
  transform: translateX(4px);
}

/* ==========================================================================
   回到顶部按钮规范 (#backToTop)
   ========================================================================== */
.back-to-top-btn {
  position: fixed;
  right: 28px;
  bottom: 36px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #7e7f80 0%, #c1c2c4 100%);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(126, 30, 6, 0.35);
  cursor: pointer;
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transform: translateY(18px) scale(0.9);
  transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
  text-decoration: none;
}

.back-to-top-btn:hover {
  background: linear-gradient(135deg, #7e7f80 0%, #c1c2c4 100%);
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 6px 22px rgba(196, 120, 70, 0.55);
  color: #ffffff;
}

.back-to-top-btn.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

/* ==========================================================================
   Content 模块 - item2 (Nishan Focuses 专栏)
   ========================================================================== */
.content-item-2 {
  width: 100%;
  /* background: linear-gradient(45deg, #0d2847, #1e4f73, #367d8f); */
  padding: 60px 0 84px;
  position: relative;
  overflow: hidden;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* PC 端一行四列卡片网格 (上图下字) */
.focus-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  width: 100%;
}

.focus-card {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
}

.focus-card-link {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100%;
  text-decoration: none;
  transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.focus-card-link:hover {
  transform: translateY(-4px);
}

.focus-card .card-img-wrapper {
  width: 100%;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: 4px;
  box-shadow: 0 6px 18px rgba(0, 10, 30, 0.35);
}

.focus-card .card-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.focus-card-link:hover .card-img-wrapper img {
  transform: scale(1.05);
}

/* 卡片文本：左上方对齐规范，字号>=16px */
.focus-card .card-body {
  padding-top: 16px;
  flex: 1;
}

.focus-card .card-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.45;
  color: #000f;
  margin: 0;
  text-align: left;
  transition: all 0.25s ease;
}

.focus-card-link:hover .card-title {
  color: #c4723c;
}

/* ==========================================================================
   Content 模块 - item3 (Global Insights 专栏)
   ========================================================================== */
.content-item-3 {
  width: 100%;
  /* background: linear-gradient(45deg, #22183c, #3a2559, #63437d); */
  padding: 60px 0 84px;
  position: relative;
  overflow: hidden;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* PC 端两行两列水平卡片网格 (左图右字) */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
  width: 100%;
}

.insight-card {
  width: 100%;
  height: 100%;
}

.insight-card-link {
  display: flex;
  flex-direction: row;
  align-items: stretch;
  background: #f8f6f4;
  border-radius: 4px;
  overflow: hidden;
  width: 100%;
  height: 100%;
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(0, 8, 26, 0.35);
  transition:
    transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1),
    box-shadow 0.3s ease;
}

.insight-card-link:hover {
  box-shadow: 0 10px 24px rgba(0, 8, 26, 0.45);
}

/* 左图：统一 3:2 宽高比规范 */
.insight-card .card-img-wrapper {
  width: 48%;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  flex-shrink: 0;
  position: relative;
}

.insight-card .card-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.insight-card-link:hover .card-img-wrapper img {
  transform: scale(1.05);
}

/* 右字：严格左上方对齐规范，字号>=16px */
.insight-card .card-body {
  width: 52%;
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  text-align: left;
}

.insight-card .card-title {
  font-size: 19px;
  font-weight: 600;
  line-height: 1.45;
  color: #181d28;
  margin: 0;
  text-align: left;
  transition: color 0.25s ease;
}

.insight-card-link:hover .card-title {
  color: #c4723c;
}

/* ==========================================================================
   Content 模块 - item4 (Confucius Festival 专栏)
   ========================================================================== */
.content-item-4 {
  width: 100%;
  background: linear-gradient(35deg, #c4723c, #e5a77e, #c4723c);
  padding: 60px 0 84px;
  position: relative;
  overflow: hidden;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* PC 端两行三列图文叠层卡片网格 */
.festival-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  width: 100%;
}

.festival-card {
  width: 100%;
  height: 100%;
  position: relative;
}

.festival-card-link {
  display: block;
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 4px;
  overflow: hidden;
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(0, 8, 26, 0.35);
  transition:
    transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1),
    box-shadow 0.3s ease;
}

.festival-card-link:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 24px rgba(0, 8, 26, 0.45);
}

/* 统一 3:2 宽高比规范 */
.festival-card .card-img-wrapper {
  width: 100%;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  position: relative;
}

.festival-card .card-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.festival-card-link:hover .card-img-wrapper img {
  transform: scale(1.05);
}

/* 底部渐变半透明蒙层：左上方对齐规范，字号>=16px */
.festival-card .card-overlay {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  padding: 30px 20px 18px;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(29, 20, 1, 0.45) 25%,
    rgba(38, 26, 1, 0.92) 85%
  );
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  text-align: left;
}

.festival-card .card-title {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.4;
  color: #ffffff;
  margin: 0;
  text-align: left;
  transition: color 0.25s ease;
}

.festival-card-link:hover .card-title {
  color: #f8c407;
}

/* ==========================================================================
   Content 模块 - item5 (Intl Exchanges 专栏 - 9:16 竖幅卡片)
   ========================================================================== */
.content-item-5 {
  width: 100%;
  background: none;
  padding: 60px 0 84px;
  position: relative;
  overflow: hidden;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* PC 端一行四列 9:16 竖幅卡片网格 */
.exchanges-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  width: 100%;
}

.exchange-card {
  width: 100%;
  height: 100%;
  position: relative;
}

.exchange-card-link {
  display: block;
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 14px;
  overflow: hidden;
  text-decoration: none;
  box-shadow: 0 8px 24px rgba(0, 8, 26, 0.45);
  transition:
    transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1),
    box-shadow 0.35s ease;
}

.exchange-card-link:hover {
  transform: translateY(-5px);
  box-shadow: 0 14px 32px rgba(0, 8, 26, 0.55);
}

/* 强制保持 9:16 宽高比 (用户指定尺寸) */
.exchange-card .card-img-wrapper {
  width: 100%;
  aspect-ratio: 9 / 16;
  overflow: hidden;
  position: relative;
  border-radius: 14px;
}

.exchange-card .card-img-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.exchange-card-link:hover .card-img-wrapper img {
  transform: scale(1.06);
}

/* 底部渐变半透明蒙层：严格左上方对齐规范，字号>=16px */
.exchange-card .card-overlay {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  padding: 38px 22px 24px;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(29, 20, 1, 0.45) 25%,
    rgba(38, 26, 1, 0.92) 85%
  );
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  text-align: left;
}

.exchange-card .card-title {
  font-size: 21px;
  font-weight: 700;
  line-height: 1.35;
  color: #ffffff;
  margin: 0 0 10px 0;
  text-align: left;
  transition: color 0.25s ease;
}

.exchange-card-link:hover .card-title {
  color: #f8c407;
}

.exchange-card .card-desc {
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.88);
  margin: 0;
  text-align: left;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ==========================================================================
   响应式断点规范 (1024px, 768px, 480px)
   ========================================================================== */

/* 1. 1024px 断点：平板/中屏微调 */
/* ==========================================================================
   Content 模块 - item6 (Charming Shandong 专栏 - 非对称拼图马赛克)
   ========================================================================== */
.content-item-6 {
  width: 100%;
  background: linear-gradient(35deg, #f7ede1, #fcf9e6, #f7ede1);
  padding: 60px 0 84px;
  position: relative;
  overflow: hidden;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

/* PC 端 4 列 4 行非对称拼图网格 */
.charming-mosaic-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: 170px 170px 150px 190px;
  gap: 16px;
  width: 100%;
}

.mosaic-item {
  width: 100%;
  height: 100%;
  position: relative;
  border-radius: 6px;
  overflow: hidden;
}

/* 左侧大列定位 */
.mosaic-item-ethnic {
  grid-column: 1 / 3;
  grid-row: 1 / 3;
}

.mosaic-item-dining {
  grid-column: 1 / 3;
  grid-row: 3 / 5;
}

/* 右侧分列定位 */
.mosaic-item-attractions {
  grid-column: 3 / 5;
  grid-row: 1 / 3;
}

.mosaic-item-hotels {
  grid-column: 3 / 4;
  grid-row: 3 / 4;
}

.mosaic-item-shopping {
  grid-column: 4 / 5;
  grid-row: 3 / 4;
}

.mosaic-item-transportation {
  grid-column: 3 / 5;
  grid-row: 4 / 5;
}

.mosaic-link {
  display: block;
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
  text-decoration: none;
  box-shadow: 0 6px 18px rgba(0, 8, 26, 0.35);
}

.mosaic-img-box {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
}

.mosaic-img-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* PC 端半透明黑色遮罩与文字：平时隐藏，鼠标悬停时浮现 */
.mosaic-mask {
  position: absolute;
  inset: 0;
  background: rgba(26, 20, 0, 0.72);
  backdrop-filter: blur(2px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  transition: opacity 0.35s ease;
  z-index: 2;
}

.mosaic-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  transform: translateY(12px);
  transition: transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.mosaic-title {
  font-size: 22px;
  font-weight: 700;
  color: #ffffff;
  margin: 0;
  letter-spacing: 0.5px;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
  transition: color 0.25s ease;
}

.mosaic-line {
  display: block;
  width: 0;
  height: 3px;
  background: #f8c407;
  margin-top: 8px;
  border-radius: 2px;
  transition: width 0.35s ease;
}

/* PC 端鼠标悬停效果 */
.mosaic-link:hover .mosaic-mask {
  opacity: 1;
}

.mosaic-link:hover .mosaic-content {
  transform: translateY(0);
}

.mosaic-link:hover .mosaic-title {
  color: #f8c407;
}

.mosaic-link:hover .mosaic-line {
  width: 40px;
}

.mosaic-link:hover .mosaic-img-box img {
  transform: scale(1.06);
}

/* ==========================================================================
   Content 模块 - 滚动视口入场动效 (Entrance Reveal Animations)
   ========================================================================== */

/* 1. item1 (UPDATES) 三列入场动效 */
.updates-col-swiper,
.updates-col-middle,
.updates-col-news {
  opacity: 0;
  transform: translateY(32px);
  transition:
    opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.content-item-1.in-view .updates-col-swiper {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 0.1s;
}

.content-item-1.in-view .updates-col-middle {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 0.22s;
}

.content-item-1.in-view .updates-col-news {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 0.34s;
}

/* 2. item2 (Nishan Focuses) 四列卡片阶梯错落入场 */
.focus-card {
  opacity: 0;
  transform: translateY(36px);
  transition:
    opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.content-item-2.in-view .focus-card {
  opacity: 1;
  transform: translateY(0);
}

.content-item-2.in-view .focus-card:nth-child(1) {
  transition-delay: 0.08s;
}
.content-item-2.in-view .focus-card:nth-child(2) {
  transition-delay: 0.18s;
}
.content-item-2.in-view .focus-card:nth-child(3) {
  transition-delay: 0.28s;
}
.content-item-2.in-view .focus-card:nth-child(4) {
  transition-delay: 0.38s;
}

/* 3. item3 (Global Insights) 两行两列卡片阶梯入场 */
.insight-card {
  opacity: 0;
  transform: translateY(36px);
  transition:
    opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.content-item-3.in-view .insight-card {
  opacity: 1;
  transform: translateY(0);
}

.content-item-3.in-view .insight-card:nth-child(1) {
  transition-delay: 0.08s;
}
.content-item-3.in-view .insight-card:nth-child(2) {
  transition-delay: 0.18s;
}
.content-item-3.in-view .insight-card:nth-child(3) {
  transition-delay: 0.28s;
}
.content-item-3.in-view .insight-card:nth-child(4) {
  transition-delay: 0.38s;
}

/* 4. item4 (Confucius Festival) 两行三列叠层卡片阶梯入场 */
.festival-card {
  opacity: 0;
  transform: translateY(36px);
  transition:
    opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.content-item-4.in-view .festival-card {
  opacity: 1;
  transform: translateY(0);
}

.content-item-4.in-view .festival-card:nth-child(1) {
  transition-delay: 0.06s;
}
.content-item-4.in-view .festival-card:nth-child(2) {
  transition-delay: 0.14s;
}
.content-item-4.in-view .festival-card:nth-child(3) {
  transition-delay: 0.22s;
}
.content-item-4.in-view .festival-card:nth-child(4) {
  transition-delay: 0.3s;
}
.content-item-4.in-view .festival-card:nth-child(5) {
  transition-delay: 0.38s;
}
.content-item-4.in-view .festival-card:nth-child(6) {
  transition-delay: 0.46s;
}

/* 5. item5 (Intl Exchanges) 四张 9:16 竖卡阶梯入场 */
.exchange-card {
  opacity: 0;
  transform: translateY(40px);
  transition:
    opacity 0.85s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.85s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.content-item-5.in-view .exchange-card {
  opacity: 1;
  transform: translateY(0);
}

.content-item-5.in-view .exchange-card:nth-child(1) {
  transition-delay: 0.08s;
}
.content-item-5.in-view .exchange-card:nth-child(2) {
  transition-delay: 0.18s;
}
.content-item-5.in-view .exchange-card:nth-child(3) {
  transition-delay: 0.28s;
}
.content-item-5.in-view .exchange-card:nth-child(4) {
  transition-delay: 0.38s;
}

/* 6. item6 (Charming Shandong) 六块非对称拼图错落升起入场 */
.mosaic-item {
  opacity: 0;
  transform: translateY(36px) scale(0.97);
  transition:
    opacity 0.85s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.85s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.content-item-6.in-view .mosaic-item {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.content-item-6.in-view .mosaic-item-ethnic {
  transition-delay: 0.08s;
}
.content-item-6.in-view .mosaic-item-attractions {
  transition-delay: 0.16s;
}
.content-item-6.in-view .mosaic-item-hotels {
  transition-delay: 0.24s;
}
.content-item-6.in-view .mosaic-item-shopping {
  transition-delay: 0.32s;
}
.content-item-6.in-view .mosaic-item-dining {
  transition-delay: 0.4s;
}
.content-item-6.in-view .mosaic-item-transportation {
  transition-delay: 0.48s;
}

/* ==========================================================================
   Footer 模块 (背景色: #c4733d)
   ========================================================================== */
.footer {
  width: 100%;
  background-color: #c4733d;
  padding: 28px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  position: relative;
  z-index: 5;
}

.footer-inner {
  width: 1200px;
  max-width: 100%;
  margin: 0 auto;
  padding: 0 20px;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.footer-logo {
  margin-bottom: 22px;
  display: inline-block;
}

.footer-logo a {
  display: inline-block;
}

.footer-logo img {
  max-height: 40px;
  width: auto;
  display: block;
  opacity: 0.95;
  transition:
    opacity 0.25s ease,
    transform 0.25s ease;
}

.footer-logo a:hover img {
  opacity: 1;
  transform: translateY(-2px);
}

/* 规范约束：全局最小字号不得低于 16px */
.footer-text {
  font-size: 16px;
  font-weight: 400;
  line-height: 1.65;
  color: #ffffff;
  margin: 4px 0;
  text-align: center;
  letter-spacing: 0.2px;
  opacity: 0.96;
}

.black {
  color: #000;
}

/* ==========================================================================
   响应式断点规范 (1024px, 768px, 480px)
   ========================================================================== */

/* 1. 1024px 断点：平板/中屏微调 */
@media screen and (max-width: 1024px) {
  .footer {
    padding: 40px 0;
  }

  .footer-inner {
    width: 92%;
  }

  .updates-layout {
    gap: 18px;
  }

  .focus-grid {
    gap: 16px;
  }

  .insights-grid {
    gap: 18px;
  }

  .festival-grid {
    gap: 16px;
  }

  .exchanges-grid {
    gap: 16px;
  }

  .charming-mosaic-grid {
    grid-template-rows: 150px 150px 130px 170px;
    gap: 14px;
  }

  .mosaic-title {
    font-size: 20px;
  }

  .focus-card .card-title {
    font-size: 17px;
  }

  .insight-card .card-body {
    padding: 18px 16px;
  }

  .insight-card .card-title {
    font-size: 17px;
  }

  .festival-card .card-title {
    font-size: 17px;
  }

  .exchange-card .card-title {
    font-size: 19px;
  }

  .exchange-card .card-desc {
    font-size: 16px;
  }

  .section-title-link {
    font-size: 32px;
  }

  .slide-title {
    font-size: 17px;
  }

  .feature-title {
    font-size: 18px;
  }

  .news-item-link {
    font-size: 17px;
  }
}

/* 2. 768px 断点：移动端主断点 */
@media screen and (max-width: 768px) {
  .footer {
    padding: 36px 0;
  }

  .footer-inner {
    width: 90%;
    padding: 0 16px;
  }

  .footer-logo {
    margin-bottom: 18px;
  }

  .footer-logo img {
    max-height: 34px;
  }

  .footer-text {
    font-size: 16px;
    line-height: 1.6;
  }

  .content-item-1 {
    padding: 38px 0 50px;
  }

  .content-item-2 {
    padding: 42px 0 56px;
  }

  .content-item-3 {
    padding: 42px 0 56px;
  }

  .content-item-4 {
    padding: 42px 0 56px;
  }

  .content-item-5 {
    padding: 42px 0 56px;
  }

  .content-item-6 {
    padding: 42px 0 56px;
  }

  .section-header {
    padding-bottom: 20px;
  }

  .section-title-link {
    font-size: 28px;
  }

  .section-title-wrap--img {
    width: 46%;
  }

  .title-bottom-bar {
    width: 110px;
    height: 3px;
  }

  .section-more-link {
    font-size: 16px;
  }

  /* 移动端排版重整：三列转为垂直自适应堆叠 */
  .updates-layout {
    flex-direction: column;
    gap: 28px;
  }

  .updates-col-swiper,
  .updates-col-middle,
  .updates-col-news {
    flex: 1 1 100%;
    max-width: 100%;
    width: 100%;
  }

  /* 768px 移动端主断点：focus-grid 转为 2x2 网格 */
  .focus-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  /* 768px 移动端主断点：insights-grid 转为单列垂直堆叠 */
  .insights-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* 768px 移动端主断点：festival-grid 转为 2 列网格 */
  .festival-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }

  /* 768px 移动端主断点：exchanges-grid 转为 2x2 网格 */
  .exchanges-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }

  /* 768px 移动端主断点：charming-mosaic-grid 转为 2 列整齐网格，遮罩与文字常驻显示 */
  .charming-mosaic-grid {
    grid-template-columns: repeat(2, 1fr);
    grid-template-rows: auto;
    grid-auto-rows: 210px;
    gap: 16px;
  }

  .mosaic-item {
    grid-column: auto !important;
    grid-row: auto !important;
  }

  /* 移动端遮罩常驻，但取消整块毛玻璃，图片保持清晰 */
  .mosaic-mask {
    opacity: 1;
    background: none;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    align-items: flex-end;
    justify-content: flex-start;
    padding: 34px 16px 16px;
  }

  /* 仅底部文字区域做局部模糊 + 渐变蒙层（类似 .card-overlay / .card-body） */
  .mosaic-mask::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 60%;
    background: linear-gradient(
      180deg,
      rgba(29, 20, 1, 0) 0%,
      rgba(29, 20, 1, 0.42) 42%,
      rgba(38, 26, 1, 0.92) 100%
    );
    -webkit-backdrop-filter: blur(3px);
    backdrop-filter: blur(3px);
    -webkit-mask-image: linear-gradient(
      180deg,
      rgba(0, 0, 0, 0) 0%,
      rgba(0, 0, 0, 1) 46%
    );
    mask-image: linear-gradient(
      180deg,
      rgba(0, 0, 0, 0) 0%,
      rgba(0, 0, 0, 1) 46%
    );
    pointer-events: none;
  }

  .mosaic-content {
    position: relative;
    z-index: 1;
    transform: none;
    align-items: flex-start;
    text-align: left;
  }

  .mosaic-title {
    font-size: 18px;
  }

  .mosaic-line {
    width: 32px;
  }

  .insight-card .card-img-wrapper {
    width: 44%;
  }

  .insight-card .card-body {
    width: 56%;
    padding: 18px 16px;
  }

  .insight-card .card-title {
    font-size: 16px;
  }

  .focus-card .card-title {
    font-size: 16px;
  }

  .festival-card .card-title {
    font-size: 16px;
  }

  .exchange-card .card-title {
    font-size: 18px;
  }

  .exchange-card .card-desc {
    font-size: 16px;
    -webkit-line-clamp: 3;
  }

  .slide-title {
    font-size: 17px;
  }

  .feature-card-body {
    padding-top: 14px;
  }

  .feature-title {
    font-size: 18px;
  }

  .news-list-wrap {
    gap: 12px;
  }

  .news-item {
    padding: 12px 0;
  }

  .news-item-link {
    font-size: 16px;
  }

  .back-to-top-btn {
    right: 18px;
    bottom: 24px;
    width: 42px;
    height: 42px;
  }
}

/* 3. 480px 断点：超小屏手机适配 */
@media screen and (max-width: 480px) {
  .footer {
    padding: 30px 0;
  }

  .footer-inner {
    width: 94%;
    padding: 0 12px;
  }

  .footer-logo {
    margin-bottom: 14px;
  }

  .footer-logo img {
    max-height: 28px;
  }

  .footer-text {
    font-size: 14px;
    line-height: 1.55;
  }

  .content-inner {
    width: 94%;
  }

  .content-item-1 {
    padding: 28px 0 40px;
  }

  .content-item-2 {
    padding: 32px 0 44px;
  }

  .content-item-3 {
    padding: 32px 0 44px;
  }

  .content-item-4 {
    padding: 32px 0 44px;
  }

  .content-item-5 {
    padding: 32px 0 44px;
  }

  .content-item-6 {
    padding: 32px 0 44px;
  }

  .section-title-link {
    font-size: 24px;
  }

  .section-title-wrap--img {
    width: 62%;
  }

  .title-bottom-bar {
    width: 80px;
  }

  .section-more-link {
    font-size: 16px;
  }

  .decor-dots {
    display: none;
  }

  /* 480px 超小屏：focus-grid 转为单列垂直堆叠 */
  .focus-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  /* 480px 超小屏：insight-card 转为单列上下排版以确保极佳体验 */
  .insights-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  /* 480px 超小屏：festival-grid 转为单列垂直堆叠 */
  .festival-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 480px 超小屏：exchanges-grid 转为单列垂直堆叠 */
  .exchanges-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  /* 480px 超小屏：charming-mosaic-grid 转为单列垂直堆叠 */
  .charming-mosaic-grid {
    grid-template-columns: 1fr;
    grid-auto-rows: 190px;
    gap: 14px;
  }

  .mosaic-title {
    font-size: 17px;
  }

  .insight-card-link {
    flex-direction: column;
  }

  .insight-card .card-img-wrapper {
    width: 100%;
  }

  .insight-card .card-body {
    width: 100%;
    padding: 14px 12px;
  }

  .insight-card .card-title {
    font-size: 16px;
  }

  .focus-card .card-title {
    font-size: 16px;
  }

  .festival-card .card-title {
    font-size: 16px;
  }

  .exchange-card .card-title {
    font-size: 18px;
  }

  .exchange-card .card-desc {
    font-size: 16px;
  }

  .slide-title {
    font-size: 16px;
  }

  .feature-title {
    font-size: 16px;
  }

  .news-item-link {
    font-size: 16px;
  }
}