/* ==========================================================================
   2026 Nanchang Aviation Industry Expo - Main Stylesheet
   Theme Color: #0b2070
   Design Max Width: 1200px
   Responsive: Mobile, Tablet, Desktop
   ========================================================================== */

/* --- CSS Variables & Design Tokens --- */
:root {
  --primary-color: #0b2070;
  --primary-light: #1638a5;
  --primary-dark: #07154a;
  --accent-blue: #1c75bc;
  --accent-cyan: #00a0e9;
  --text-main: #1f2d3d;
  --text-regular: #475669;
  --text-light: #8492a6;
  --text-muted: #99a9bf;
  --border-color: #e4e7ed;
  --bg-light: #f5f8fc;
  --bg-white: #ffffff;
  --card-shadow: 0 4px 16px rgba(11, 32, 112, 0.08);
  --card-hover-shadow: 0 12px 28px rgba(11, 32, 112, 0.16);
  --container-width: 1200px;
  --transition-fast: 0.25s ease;
  --transition-normal: 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);

  /* var(--c-green)专区 */
  --media-gap: 20px;
  --media-item-w: 180px;
  --media-item-h: 100px;
}

/* --- Base & Reset --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  color: var(--text-main);
  background: linear-gradient(180deg, #f4faff 0%, #ccdaf4 100%);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all var(--transition-fast);
}

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  outline: none;
}

/* --- Layout Container --- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-left: auto;
  margin-right: auto;
}

/* --- 首页背景包裹层 --- */
.index-bg {
  background: url("../images/bg.png") no-repeat right bottom;
  background-size: cover;
  padding: 100px 0;
}

/* --- Section Headers --- */
.section-title-box {
  text-align: center;
  margin-bottom: 80px;
  position: relative;
}

.section-title-box .title-zh {
  font-size: 42px;
  font-weight: 700;
  color: #333;
  letter-spacing: 4px;
  position: relative;
  z-index: 3;
  display: inline-block;
}

.section-title-box .title-zh::after {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 56px;
  height: 3px;
  background: linear-gradient(90deg, #00a0e9, #0b2070);
  border-radius: 2px;
}

.section-title-box .title-en {
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  bottom: 14px;
  font-size: 66px;
  font-weight: 800;
  color: #aaa;
  text-transform: uppercase;
  z-index: 1;
  pointer-events: none;
  white-space: nowrap;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(to bottom, #000 55%, transparent 95%);
  mask-image: linear-gradient(to bottom, #000 55%, transparent 80%);
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
  box-shadow: 0 2px 14px rgba(11, 32, 112, 0.08);
  transition: all var(--transition-normal);
}

.site-header.scrolled {
  box-shadow: 0 4px 20px rgba(11, 32, 112, 0.12);
}

.header-placeholder {
  height: 78px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
}

.logo-box {
  display: flex;
  align-items: center;
}

.site-logo {
  height: 52px;
  width: auto;
  object-fit: contain;
}

/* Desktop Navigation */
.desktop-nav {
  display: block;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 10px 14px;
  font-size: 15px;
  font-weight: 500;
  color: #2c3e50;
  border-radius: 4px;
  position: relative;
}

.nav-item:hover > .nav-link,
.nav-item.active > .nav-link {
  color: var(--primary-color);
  font-weight: 600;
}

/* Dropdown Sub-menu */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 160px;
  background: #ffffff;
  border-radius: 6px;
  box-shadow: 0 8px 24px rgba(11, 32, 112, 0.12);
  padding: 8px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition-normal);
  z-index: 1050;
  border-top: 3px solid var(--primary-color);
}

.nav-item:hover > .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu li a {
  display: block;
  padding: 10px 18px;
  font-size: 14px;
  color: #334155;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.dropdown-menu li a:hover {
  background-color: #f0f4fc;
  color: var(--primary-color);
  padding-left: 22px;
}

/* Mobile Hamburger Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 5px;
  z-index: 1001;
}

.hamburger-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--primary-color);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.menu-toggle.active .hamburger-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active .hamburger-bar:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active .hamburger-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ==========================================================================
   Mobile Drawer Sidebar
   ========================================================================== */
.drawer-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  z-index: 1100;
}

.drawer-overlay.active {
  opacity: 1;
  visibility: visible;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: -320px;
  width: 300px;
  height: 100vh;
  background: #ffffff;
  box-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
  z-index: 1200;
  display: flex;
  flex-direction: column;
  transition: right var(--transition-normal);
  overflow-y: auto;
}

.mobile-drawer.active {
  right: 0;
}

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
}

.drawer-logo {
  height: 38px;
  width: auto;
}

.drawer-close {
  font-size: 30px;
  line-height: 1;
  color: #7f8c8d;
}

.drawer-body {
  padding: 12px 0;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
}

.mobile-nav-item {
  border-bottom: 1px solid #f1f5f9;
}

.mobile-link {
  display: block;
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 500;
  color: #1e293b;
}

.mobile-nav-item.active > .mobile-link,
.mobile-nav-item.active > .dropdown-title > .mobile-link {
  color: var(--primary-color);
  font-weight: 600;
}

.dropdown-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-right: 16px;
}

.dropdown-toggle-btn {
  width: 34px;
  height: 34px;
  font-size: 18px;
  font-weight: 700;
  color: #64748b;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
}

.mobile-sub-menu {
  display: none;
  background: #f8fafc;
  padding: 6px 0;
}

.mobile-sub-menu li a {
  display: block;
  padding: 10px 32px;
  font-size: 14px;
  color: #475569;
}

.mobile-sub-menu li a:hover {
  color: var(--primary-color);
}

/* ==========================================================================
   1. Banner Section
   ========================================================================== */
.banner-section {
  width: 100%;
  position: relative;
  overflow: hidden;
  background-color: #0b2070;
}

.bannerSwiper {
  width: 100%;
  max-width: 1920px;
  margin: 0 auto;
}

.banner-image {
  width: 100%;
  height: auto;
  display: block;
}

.bannerSwiper .banner-prev,
.bannerSwiper .banner-next {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.5);
  color: #ffffff;
  opacity: 0;
  transition: all var(--transition-fast);
}

.bannerSwiper:hover .banner-prev,
.bannerSwiper:hover .banner-next {
  opacity: 1;
}

.bannerSwiper .banner-prev:hover,
.bannerSwiper .banner-next:hover {
  background: var(--primary-color);
  border-color: var(--primary-color);
}

.bannerSwiper .banner-prev:after,
.bannerSwiper .banner-next:after {
  font-size: 18px;
  font-weight: bold;
}

.bannerSwiper .banner-pagination {
  bottom: 18px;
}

.bannerSwiper .swiper-pagination-bullet {
  width: 28px;
  height: 4px;
  border-radius: 2px;
  background: #ffffff;
  opacity: 0.5;
  transition: all var(--transition-fast);
}

.bannerSwiper .swiper-pagination-bullet-active {
  width: 44px;
  opacity: 1;
}

/* ==========================================================================
   2. Quick Access Cards (01-04)
   ========================================================================== */
.quick-access-section {
  padding: 40px 0 30px;
  position: relative;
  z-index: 10;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.quick-card {
  background: #ffffff;
  border-radius: 12px;
  padding: 24px 20px 22px;
  box-shadow: var(--card-shadow);
  text-align: center;
  position: relative;
  transition: all var(--transition-normal);
  border: 1px solid rgba(226, 232, 240, 0.8);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.quick-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--card-hover-shadow);
  border-color: rgba(11, 32, 112, 0.2);
}

.card-num {
  position: absolute;
  top: 14px;
  left: 18px;
  font-size: 20px;
  font-weight: 800;
  color: #93b5e8;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.card-icon {
  width: 58px;
  height: 58px;
  margin: 8px auto 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
}

.quick-card:hover .card-icon {
  transform: scale(1.1);
}

.card-icon img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.card-title {
  font-size: 18px;
  font-weight: 700;
  color: #1e293b;
  margin-bottom: 6px;
  transition: color var(--transition-fast);
}

.quick-card:hover .card-title {
  color: var(--primary-color);
}

.card-subtitle {
  font-size: 12px;
  color: var(--text-light);
  line-height: 1.3;
}

/* ==========================================================================
   3. VR Hub & Feature Action Buttons
   ========================================================================== */
.vr-hub-section {
  padding: 50px 0;
}

.vr-main-card {
  display: block;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(11, 32, 112, 0.12);
  margin-bottom: 24px;
  transition: all var(--transition-normal);
}

.vr-main-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 32px rgba(11, 32, 112, 0.2);
}

.vr-banner-img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s ease;
}

.vr-main-card:hover .vr-banner-img {
  transform: scale(1.02);
}

/* 3 Feature Action Buttons Row */
.feature-btns-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  border-radius: 12px;
  position: relative;
  overflow: hidden;
  /* background: linear-gradient(135deg, #1b499e 0%, #0b2070 100%); */
  color: #ffffff;
  box-shadow: 0 6px 18px rgba(11, 32, 112, 0.2);
  transition: all var(--transition-normal);
}

.feature-btn::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transition: left 0.6s ease;
}

.feature-btn:hover::before {
  left: 100%;
}

.feature-btn:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 28px rgba(11, 32, 112, 0.3);
}

.feature-btn.btn-video {
  background: linear-gradient(135deg, #3a60b5 0%, #173b94 100%);
}

.feature-btn.btn-events {
  /* background: linear-gradient(135deg, #2b6cb0 0%, #0d3882 100%); */
}

.feature-btn.btn-onsite {
  background: linear-gradient(135deg, #2b55a8 0%, #0b2070 100%);
}

.feature-btn .btn-icon {
  font-size: 20px;
  color: #72b0ff;
}

.feature-btn .btn-text {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 2px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* ==========================================================================
   4. 新闻中心 (News Center)
   ========================================================================== */
.news-center-section {
  padding: 100px 0;
}

.news-columns-wrap {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 36px;
}

.news-col {
  border-radius: 12px;
  display: flex;
  flex-direction: column;
}

.news-cover-box {
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 18px;
}

.news-cover-img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.news-cover-box:hover .news-cover-img {
  transform: scale(1.04);
}

.news-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid #aaa;
  margin-bottom: 14px;
}

.col-heading {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-color);
  position: relative;
  padding-left: 12px;
}

.col-heading::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 18px;
  background-color: var(--primary-color);
  border-radius: 2px;
}

.col-more {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  color: #718096;
}

.col-more:hover {
  color: var(--primary-color);
}

.more-arrow {
  width: 12px;
  height: 12px;
  object-fit: contain;
}

.news-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.news-item {
  position: relative;
}

.news-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  color: #334155;
  padding: 3px 0;
  transition: all var(--transition-fast);
}

.news-item .news-dot {
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: #94a3b8;
  flex-shrink: 0;
  transition: background-color var(--transition-fast);
}

.news-text {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.news-date {
  font-size: 13px;
  color: #94a3b8;
  flex-shrink: 0;
  font-family: monospace, sans-serif;
}

.news-item:hover .news-link {
  color: var(--primary-color);
  padding-left: 6px;
}

.news-item:hover .news-dot {
  background-color: var(--primary-color);
}

/* ==========================================================================
   5. 同期活动 (Concurrent Events - Coverflow)
   ========================================================================== */
.concurrent-events-section {
  padding: 100px 0;
  position: relative;
  overflow: hidden;
}

.events-coverflow {
  position: relative;
  padding: 0 70px;
  user-select: none;
}

.coverflow-track {
  list-style: none;
  position: relative;
  height: clamp(200px, 36vw, 440px);
  touch-action: pan-y;
}

.coverflow-item {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 560px;
  max-width: 62%;
  aspect-ratio: 4 / 3;
  transform: translate(-50%, -50%) scale(0.5);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.6s cubic-bezier(0.25, 0.8, 0.25, 1), opacity 0.6s ease, filter 0.6s ease;
}

.coverflow-card {
  display: block;
  position: relative;
  width: 100%;
  height: 100%;
  box-shadow: 0 16px 40px rgba(11, 32, 112, 0.22);
  overflow: hidden;
}

.coverflow-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.coverflow-caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 36px 20px 16px;
  background: linear-gradient(180deg, transparent, rgba(7, 21, 74, 0.85));
  color: #ffffff;
  opacity: 0;
  transform: translateY(12px);
  transition: all 0.5s ease 0.15s;
}

.coverflow-caption h3 {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
}

.coverflow-tag {
  display: inline-block;
  font-size: 12px;
  padding: 2px 10px;
  margin-bottom: 8px;
  border-radius: 20px;
  background: var(--accent-cyan);
}

.coverflow-item.pos-0 {
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
  z-index: 5;
  pointer-events: auto;
}

.coverflow-item.pos-0 .coverflow-caption {
  opacity: 1;
  transform: none;
}

.coverflow-item.pos-1,
.coverflow-item.pos--1 {
  opacity: 1;
  z-index: 4;
  pointer-events: auto;
  cursor: pointer;
  filter: brightness(0.92);
}

.coverflow-item.pos-1 { transform: translate(calc(-50% + 38%), -50%) scale(0.82); }
.coverflow-item.pos--1 { transform: translate(calc(-50% - 38%), -50%) scale(0.82); }

.coverflow-item.pos-2,
.coverflow-item.pos--2 {
  opacity: 1;
  z-index: 3;
  pointer-events: auto;
  cursor: pointer;
  filter: brightness(0.85);
}

.coverflow-item.pos-2 { transform: translate(calc(-50% + 62%), -50%) scale(0.66); }
.coverflow-item.pos--2 { transform: translate(calc(-50% - 62%), -50%) scale(0.66); }

.coverflow-arrow {
  position: absolute;
  top: calc(50% - 16px);
  z-index: 10;
  width: 56px;
  height: 56px;
  margin-top: -28px;
  border: 0;
  background: transparent;
  cursor: pointer;
  opacity: 0.85;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.coverflow-arrow::before,
.coverflow-arrow::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 22px;
  height: 22px;
  border-left: 5px solid #ffffff;
  border-bottom: 5px solid #ffffff;
  filter: drop-shadow(0 2px 4px rgba(11, 32, 112, 0.45));
}

.coverflow-prev { left: 0; }
.coverflow-next { right: 0; }
.coverflow-prev::before { left: 12px; transform: translateY(-50%) rotate(45deg); }
.coverflow-prev::after { left: 26px; transform: translateY(-50%) rotate(45deg); }
.coverflow-next::before { right: 12px; transform: translateY(-50%) rotate(-135deg); }
.coverflow-next::after { right: 26px; transform: translateY(-50%) rotate(-135deg); }

.coverflow-arrow:hover { opacity: 1; }
.coverflow-prev:hover { transform: translateX(-4px); }
.coverflow-next:hover { transform: translateX(4px); }

.coverflow-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  /* margin-top: 24px; */
}

.coverflow-dots button {
  width: 10px;
  height: 10px;
  border: 0;
  border-radius: 5px;
  background: #b9c6dc;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.coverflow-dots button.active {
  width: 26px;
  background: var(--primary-color);
}

/* ==========================================================================
   6. 展区规划 (Exhibition Area Planning)
   ========================================================================== */
.exhibition-plan-section {
  padding: 100px 0;
}

.plan-map-wrapper {
  text-align: center;
}

.plan-map-img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  margin: 0 auto;
  transition: all var(--transition-normal);
  cursor: pointer;
}

.plan-map-img:hover {
  transform: translateY(-5px);
}

/* ==========================================================================
   7. 媒体专区 (Media Zone) —— 真正无缝，无顿挫
   ========================================================================== */
.media-zone-section {
  padding: 60px 0 70px;
}

.media-group-title {
  font-size: 20px;
  color: var(--primary-color);
  font-weight: 700;
  margin-bottom: 20px;
  padding-left: 12px;
  border-left: 4px solid var(--primary-color);
}

.media-scroll-wrap {
  margin-bottom: 20px;
}

.media-scroll-row {
  overflow: hidden;
  position: relative;
}

/* 轨道：只负责横向排列，位移由 JS 控制 */
.media-scroll-track {
  display: flex;
  width: max-content;
  will-change: transform;
  /* 不再用 animation，避免循环点顿挫 */
}

/* 每一组内容 A / B */
.media-group {
  display: flex;
  flex: 0 0 auto;
  gap: var(--media-gap);
  padding-right: var(--media-gap);
  box-sizing: content-box;
}

/* 单个媒体卡片 */
.media-scroll-item {
  flex: 0 0 var(--media-item-w);
  width: var(--media-item-w);
  height: var(--media-item-h);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #fff;
  border-radius: 5px;
  box-shadow: 0 2px 8px rgba(11, 32, 112, 0.06);
  box-sizing: border-box;
  overflow: hidden;
}

.media-scroll-item img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
  transition: all 0.5s;
}

.media-scroll-item img:hover {
  transform: scale(1.1);
}

/* 悬停暂停：由 JS 控制 */
.media-scroll-row.is-paused .media-scroll-track {
  /* 仅用于提示，实际暂停靠 JS */
}

/* 原始数据隐藏 */
[data-media-raw] {
  display: none !important;
}
/* ==========================================================================
   8. 页脚 Footer
   ========================================================================== */
.site-footer {
  padding: 80px 0;
  color: #334155;
  background: url(../images/bg05.jpg) no-repeat top center;
  background-size: cover;
  border-top: 1px solid #dce5f2;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-organizer {
  font-size: 16px;
  font-weight: 700;
  color: #0f172a;
}

.organizer-label {
  color: var(--primary-color);
}

.footer-copyright {
  font-size: 14px;
  color: #64748b;
}

.footer-location {
  font-size: 13px;
  color: #64748b;
}

.footer-right {
  flex-shrink: 0;
}

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

.qr-img {
  width: 110px;
  height: 110px;
  background: #ffffff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  margin-bottom: 6px;
}

.qr-text {
  font-size: 13px;
  color: #475569;
  font-weight: 500;
}

/* ==========================================================================
   Back to Top Floating Button
   ========================================================================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 46px;
  height: 46px;
  background: var(--primary-color);
  color: #ffffff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(11, 32, 112, 0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: all var(--transition-normal);
  z-index: 990;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--primary-light);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(11, 32, 112, 0.4);
}

/* ==========================================================================
   9. 展会亮点翻转卡片（保留备用）
   ========================================================================== */
.exhibition-highlights-con {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  padding-left: 0;
}

.exhibition-highlights-item {
  margin-bottom: 25px;
  width: 580px;
  height: 256px;
  perspective: 1000px;
  cursor: pointer;
}

.exhibition-highlights-before,
.exhibition-highlights-after {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  color: #fff;
  background-color: var(--primary-color);
  transition: all 1s ease-in-out 0s;
}

.exhibition-highlights-before {
  display: flex;
  justify-content: center;
  align-items: center;
  backface-visibility: hidden;
  text-align: center;
  font-size: 20px;
  line-height: 64px;
  background-image: url(../images/exhibition-highlights-after-bg.png);
  background-repeat: no-repeat;
  background-size: 100%;
  background-position: center;
}

.exhibition-highlights-after {
  transform: rotateY(180deg);
}

.exhibition-highlights-after p {
  margin: 20px;
  padding: 10px 20px 0;
  height: calc(100% - 40px);
  color: #000;
  font-size: 14px;
  text-indent: 2em;
  line-height: 26px;
  background-color: #fff;
  border: 1px solid var(--primary-color);
  display: flex;
  align-items: center;
}

.exhibition-highlights-item:hover .exhibition-highlights-before {
  transform: rotateY(180deg);
}

.exhibition-highlights-item:hover .exhibition-highlights-after {
  transform: rotateY(360deg);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

/* Large Tablets / Small Laptops (<= 1200px) */
@media (max-width: 1200px) {
  .header-inner {
    padding-left: 15px;
    padding-right: 15px;
  }

  .nav-list { gap: 2px; }
  .nav-link { padding: 8px 10px; font-size: 14px; }
  .cards-grid { gap: 16px; }
}

/* Medium Tablets (<= 992px) */
@media (max-width: 992px) {
  .desktop-nav { display: none; }
  .menu-toggle { display: flex; }

  .cards-grid { grid-template-columns: repeat(2, 1fr); }
  .news-columns-wrap {grid-template-columns: 1fr;gap: 28px;/* width: 100%; */display: block;margin-bottom: 10p;}

  .feature-btn .btn-text { font-size: 18px; }
}

/* Mobile Phones (<= 768px) */
@media (max-width: 768px) {
  :root {
    --media-gap: 20px;
    --media-item-w: 100px;
    --media-item-h: 70px;
  }
  .coverflow-caption{display: none;}
  .news-col{margin-top: 20px;}
  .back-to-top.visible{display: none;}
  .index-bg{padding: 50px 10px;}

  .header-placeholder { height: 64px; }
  .header-inner { height: 64px; }
  .site-logo { height: 40px; }

  .section-title-box {margin-bottom: 24px;}
  .section-title-box .title-zh {font-size: 26px;}
  .section-title-box .title-en {font-size: 32px;/* letter-spacing: 2px; */}

  .quick-access-section { padding: 24px 0 16px; }
  .cards-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }

  .quick-card { padding: 18px 14px 16px; border-radius: 10px; }
  .card-num { font-size: 16px; top: 10px; left: 12px; }
  .card-icon { width: 44px; height: 44px; margin: 6px auto 10px; }
  .card-title { font-size: 15px; }
  .card-subtitle { font-size: 11px; }

  .vr-hub-section { padding: 30px 0; }


  /* ===== 新闻中心 - 手机端 ===== */
  .news-center-section {padding: 30px 0;}

  .news-cover-img {height: 180px;}

  .news-header { gap: 10px; }
  .col-heading { font-size: 17px; padding-left: 10px; }
  .col-heading::before { height: 16px; width: 3px; }
  .col-more { font-size: 13px; flex-shrink: 0; }

  .news-list { gap: 8px; }

  .news-link {
    /* flex-direction: column; */
    /* align-items: flex-start; */
    gap: 4px;
    /* padding: 8px 0; */
  }

  .news-text {
    /* white-space: normal; */
    font-size: 14px;
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    width: 100%;
  }

  .news-date { font-size: 12px; }

  .news-item:hover .news-link {
    padding-left: 0;
    color: #334155;
  }
  .news-item:hover .news-dot {
    background-color: #94a3b8;
  }
  
  .concurrent-events-section{padding: 50px 0;}
  .events-coverflow{padding: 0 10px;}
  .media-zone-section{padding: 0;}
  /* ===== 新闻中心 - 手机端 end ===== */
 .site-footer{padding: 30px 10px;}
}