/* ========================================
   迅凯催化风格 - 导航栏样式
   ======================================== */
nav.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  min-height: 80px;
  height: auto !important;
  background-color: transparent !important;
  box-shadow: none !important;
  z-index: 1030;
  transition: all 0.3s ease;
  overflow: visible !important;
}

nav.navbar.scrolled {
  min-height: 70px;
  height: auto !important;
  background-color: rgba(255, 255, 255, 0.98) !important;
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0, 120, 215, 0.1) !important;
}

.nav-container {
  max-width: 1600px !important;
  width: 100%;
  margin: 0 auto;
  padding: 0 30px;
  min-height: 80px;
  height: auto;
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  flex-wrap: nowrap !important;
  gap: 20px;
}

/* Logo样式 */
nav.navbar .nav-logo {
  display: flex !important;
  align-items: center !important;
  flex-direction: row !important;
  gap: 10px;
  text-decoration: none;
  flex-wrap: nowrap !important;
  flex-shrink: 0;
  margin-right: 20px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
}

.logo-icon svg,
.logo-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.logo-text-wrap {
  display: flex !important;
  flex-direction: row !important;
  align-items: center !important;
  gap: 10px;
  line-height: 1.2;
}

.logo-cn {
  font-size: 16px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: 1px;
  white-space: nowrap !important;
}

.logo-en {
  font-size: 11px;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: 1px;
  text-transform: uppercase;
  padding-left: 10px;
  border-left: 1px solid rgba(255, 255, 255, 0.3);
  white-space: nowrap !important;
}

.logo-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-left: 20px;
  padding: 6px 12px;
  border: 2px solid #D32F2F;
  background-color: white;
  white-space: nowrap;
}

.badge-hitachi {
  font-size: 12px;
  font-weight: 700;
  color: #D32F2F;
  letter-spacing: 0.5px;
  line-height: 1;
}

.badge-chinese {
  font-size: 9px;
  font-weight: 600;
  color: #D32F2F;
  line-height: 1.4;
  margin-top: 2px;
}

nav.navbar.scrolled .logo-cn {
  color: var(--primary-color);
}

nav.navbar.scrolled .logo-en {
  color: var(--text-medium);
}

nav.navbar.scrolled .logo-icon svg circle {
  stroke: #D32F2F;
}

nav.navbar.scrolled .logo-icon svg text {
  fill: #D32F2F;
}

/* 导航菜单 */
nav.navbar .nav-menu {
  display: flex !important;
  align-items: center !important;
  flex-direction: row !important;
  gap: 30px;
  flex: 1;
  justify-content: center;
  flex-wrap: nowrap !important;
}

nav.navbar .nav-links {
  display: flex !important;
  align-items: center !important;
  flex-direction: row !important;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: nowrap !important;
}

nav.navbar .nav-item {
  display: flex !important;
  align-items: center !important;
  flex-direction: row !important;
  position: relative;
  white-space: nowrap !important;
}

.nav-item {
  position: relative;
}

nav.navbar .nav-link {
  display: flex !important;
  align-items: center !important;
  flex-direction: row !important;
  gap: 6px;
  font-size: 16px;
  font-weight: 500;
  color: #ffffff;
  text-decoration: none;
  padding: 8px 0;
  position: relative;
  transition: color 0.3s ease;
  white-space: nowrap !important;
  writing-mode: horizontal-tb !important;
}

nav.navbar .nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background-color: #B31E23;
  transition: width 0.3s ease;
}

nav.navbar .nav-link:hover {
  color: #B31E23;
}

nav.navbar .nav-link:hover::after {
  width: 100%;
}

nav.navbar .nav-link.active {
  color: #B31E23;
}

nav.navbar .nav-link.active::after {
  width: 100%;
}

nav.navbar.scrolled .nav-link {
  color: #1A1A2E !important;
}

nav.navbar.scrolled .nav-link:hover {
  color: #B31E23 !important;
}

nav.navbar.scrolled .nav-link.active {
  color: #B31E23 !important;
}

nav.navbar.scrolled .nav-link::after {
  background-color: #B31E23;
}

/* 右侧操作区 */
nav.navbar .nav-actions {
  display: flex !important;
  align-items: center !important;
  flex-direction: row !important;
  gap: 16px;
  flex-shrink: 0;
  margin-left: 20px;
}

nav.navbar .nav-phone {
  display: flex !important;
  align-items: center !important;
  gap: 8px;
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: color 0.3s ease;
  white-space: nowrap;
}

nav.navbar .nav-phone i {
  color: var(--accent-color);
  font-size: 16px;
}

nav.navbar .nav-phone:hover {
  color: var(--accent-color);
}

nav.navbar.scrolled .nav-phone {
  color: var(--text-dark);
}

nav.navbar.scrolled .nav-phone:hover {
  color: var(--primary-color);
}

nav.navbar .nav-icon-btn {
  width: 40px;
  height: 40px;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  color: #ffffff;
  font-size: 18px;
  cursor: pointer;
  transition: color 0.3s ease;
}

nav.navbar .nav-icon-btn:hover {
  color: var(--accent-color);
}

nav.navbar.scrolled .nav-icon-btn {
  color: var(--text-medium);
}

nav.navbar.scrolled .nav-icon-btn:hover {
  color: var(--primary-color);
}

/* 语言选择 */
nav.navbar .nav-lang {
  position: relative !important;
  z-index: 100 !important;
}

nav.navbar .lang-dropdown {
  position: relative !important;
}

nav.navbar .lang-select {
  display: flex !important;
  align-items: center !important;
  flex-direction: row !important;
  gap: 6px;
  padding: 6px 12px;
  color: #ffffff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  background: none;
  border: none;
  transition: color 0.3s ease;
}

nav.navbar .lang-select:hover {
  color: var(--accent-color);
}

nav.navbar .lang-select i {
  font-size: 10px;
  transition: transform 0.3s ease;
}

nav.navbar .lang-dropdown.open .lang-select i {
  transform: rotate(180deg);
}

#langOptions {
  position: absolute !important;
  top: 100% !important;
  right: 0 !important;
  margin-top: 8px !important;
  background-color: rgba(255, 255, 255, 0.2) !important;
  backdrop-filter: blur(10px) !important;
  -webkit-backdrop-filter: blur(10px) !important;
  border: 1px solid rgba(255, 255, 255, 0.3) !important;
  border-radius: 8px !important;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15) !important;
  min-width: 120px !important;
  overflow: hidden !important;
  opacity: 0 !important;
  visibility: hidden !important;
  transform: translateY(-10px) !important;
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease !important;
  z-index: 9999 !important;
  pointer-events: none !important;
}

nav.navbar .lang-dropdown.open #langOptions {
  opacity: 1 !important;
  visibility: visible !important;
  transform: translateY(0) !important;
  pointer-events: auto !important;
}

nav.navbar #langOptions .lang-option {
  display: block !important;
  padding: 10px 18px !important;
  color: #ffffff !important;
  font-size: 14px !important;
  font-weight: 500 !important;
  text-decoration: none !important;
  text-align: center !important;
  transition: all 0.2s ease !important;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15) !important;
}

nav.navbar #langOptions .lang-option:last-child {
  border-bottom: none !important;
}

nav.navbar #langOptions .lang-option:hover {
  background-color: transparent !important;
  color: #FF4500 !important;
}

nav.navbar #langOptions .lang-option.active {
  background-color: transparent !important;
  color: #FF4500 !important;
  font-weight: 600 !important;
}

nav.navbar .lang-option {
  display: block;
  padding: 10px 16px;
  color: var(--text-dark);
  font-size: 14px;
  text-decoration: none;
  transition: all 0.2s ease;
  text-align: center;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

nav.navbar .lang-option:last-child {
  border-bottom: none;
}

nav.navbar .lang-option:hover {
  background-color: transparent;
  color: #FF4500;
}

nav.navbar .lang-option.active {
  background-color: transparent;
  color: #FF4500;
  font-weight: 600;
}

nav.navbar.scrolled .lang-select {
  color: var(--text-dark);
}

nav.navbar.scrolled .lang-select:hover {
  color: #FF4500;
}

/* 联系我们按钮 */
nav.navbar .nav-contact-btn {
  display: flex !important;
  align-items: center !important;
  gap: 10px;
  padding: 10px 24px;
  border: 2px solid rgba(255, 255, 255, 0.6);
  border-radius: 50px;
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
}

nav.navbar .nav-contact-btn:hover {
  background-color: #ffffff;
  color: #B31E23;
  border-color: #ffffff;
}

nav.navbar .contact-arrow {
  width: 28px;
  height: 28px;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  background-color: #B31E23;
  border-radius: 50%;
  font-size: 12px;
  transition: all 0.3s ease;
}

nav.navbar .nav-contact-btn:hover .contact-arrow {
  background-color: #B31E23;
  transform: translateX(3px);
}

nav.navbar.scrolled .nav-contact-btn {
  border-color: #B31E23;
  color: #B31E23;
}

nav.navbar.scrolled .nav-contact-btn:hover {
  background-color: #B31E23;
  color: #ffffff;
}

nav.navbar.scrolled .nav-contact-btn:hover .contact-arrow {
  background-color: #ffffff;
  color: #B31E23;
}

nav.navbar.scrolled .contact-arrow {
  background-color: #B31E23;
  color: #ffffff;
}

/* 汉堡菜单 */
nav.navbar .nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 22px;
  cursor: pointer;
  z-index: 1031;
  background: none;
  border: none;
  padding: 0;
}

nav.navbar.scrolled .nav-toggle {
  color: var(--text-dark);
}

/* 移动端操作区（桌面端隐藏） */
.nav-mobile-actions {
  display: none;
}

.nav-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.6);
  z-index: 1029;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.nav-overlay.active {
  display: block;
  opacity: 1;
  visibility: visible;
}

/* 移动端菜单 */
.nav-menu-mobile {
  position: fixed;
  top: 0;
  right: 0;
  width: 280px;
  height: 100vh;
  background-color: #ffffff;
  padding: 20px;
  transform: translateX(100%);
  transition: transform 0.3s ease;
  z-index: 1032;
  overflow-y: auto;
}

.nav-menu-mobile.active {
  transform: translateX(0);
}

.nav-menu-mobile .mobile-close {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 30px;
}

.nav-menu-mobile .mobile-close button {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  color: var(--text-dark);
  font-size: 18px;
  cursor: pointer;
}

.nav-menu-mobile .nav-links-mobile {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-menu-mobile .nav-links-mobile li {
  margin-bottom: 10px;
}

.nav-menu-mobile .nav-links-mobile a {
  display: block;
  padding: 16px 20px;
  color: var(--text-dark);
  font-size: 16px;
  font-weight: 500;
  text-decoration: none;
  border-radius: 8px;
  transition: background-color 0.2s ease;
}

.nav-menu-mobile .nav-links-mobile a:hover,
.nav-menu-mobile .nav-links-mobile a.active {
  background-color: rgba(0, 120, 215, 0.08);
  color: var(--primary-color);
}

.nav-menu-mobile .mobile-phone {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  margin-top: 20px;
  margin-bottom: 10px;
  background-color: rgba(0, 120, 215, 0.05);
  border-radius: 8px;
  color: var(--primary-color);
  font-size: 16px;
  font-weight: 600;
}

.nav-menu-mobile .mobile-lang {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

.nav-menu-mobile .mobile-lang-title {
  font-size: 14px;
  color: var(--text-medium);
  margin-bottom: 12px;
}

.nav-menu-mobile .mobile-lang-options {
  display: flex;
  gap: 10px;
}

.nav-menu-mobile .mobile-lang-options button {
  flex: 1;
  padding: 12px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: transparent;
  color: var(--text-dark);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-menu-mobile .mobile-lang-options button.active,
.nav-menu-mobile .mobile-lang-options button:hover {
  background-color: var(--primary-color);
  color: #ffffff;
  border-color: var(--primary-color);
}

.nav-menu-mobile .mobile-contact-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px;
  margin-top: 20px;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  border-radius: 50px;
  color: #ffffff;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
}

.nav-menu-mobile .mobile-contact-btn i {
  font-size: 14px;
}

/* ========================================
   迅凯催化风格 - Hero区域样式
   ======================================== */
.hero-section {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 650px;
  overflow: hidden;
}

.hero-swiper {
  position: relative;
  width: 100%;
  height: 100%;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  visibility: hidden;
  transition: opacity 1.2s ease, visibility 1.2s ease;
}

.hero-slide.active {
  opacity: 1;
  visibility: visible;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, rgba(0, 40, 80, 0.7) 0%, rgba(0, 40, 80, 0.3) 50%, rgba(0, 40, 80, 0.1) 100%);
}

.hero-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 40px;
  height: 100%;
  position: relative;
  z-index: 2;
}

.hero-content {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  text-align: left;
  color: #ffffff;
  max-width: 650px;
  padding-top: 80px;
}

.hero-title {
  font-size: 52px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
  letter-spacing: 1px;
  opacity: 0;
  transform: translateY(30px);
  animation: heroFadeInUp 1s ease forwards;
  animation-delay: 0.3s;
}

.hero-subtitle {
  font-size: 20px;
  font-weight: 400;
  line-height: 1.7;
  margin-bottom: 40px;
  opacity: 0.9;
  opacity: 0;
  transform: translateY(30px);
  animation: heroFadeInUp 1s ease forwards;
  animation-delay: 0.5s;
}

.hero-buttons {
  opacity: 0;
  transform: translateY(30px);
  animation: heroFadeInUp 1s ease forwards;
  animation-delay: 0.7s;
}

/* Hero按钮 - 白色圆角带蓝色箭头 */
.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  padding: 8px 8px 8px 32px;
  background-color: #ffffff;
  border-radius: 50px;
  text-decoration: none;
  transition: all 0.4s ease;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.hero-btn-text {
  font-size: 17px;
  font-weight: 600;
  color: var(--primary-color);
  letter-spacing: 1px;
}

.hero-btn-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--primary-color);
  border-radius: 50%;
  color: #ffffff;
  font-size: 16px;
  transition: all 0.4s ease;
  flex-shrink: 0;
}

.hero-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 15px 40px rgba(0, 120, 215, 0.3);
}

.hero-btn:hover .hero-btn-icon {
  background-color: var(--accent-color);
  transform: translateX(5px);
}

@keyframes heroFadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 轮播指示器 - 连接线式 */
.swiper-indicators {
  position: absolute;
  bottom: 50px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
}

.indicator-line {
  display: flex;
  align-items: center;
  gap: 0;
}

.swiper-indicator {
  position: relative;
  width: 20px;
  height: 20px;
  padding: 0;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
}

.indicator-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.5);
  border: 2px solid rgba(255, 255, 255, 0.8);
  transition: all 0.3s ease;
}

.swiper-indicator.active .indicator-dot {
  width: 16px;
  height: 16px;
  background-color: var(--accent-color);
  border-color: var(--accent-color);
  box-shadow: 0 0 0 4px rgba(255, 69, 0, 0.25);
}

.indicator-connector {
  width: 40px;
  height: 2px;
  background-color: rgba(255, 255, 255, 0.4);
  margin: 0 -4px;
}

/* ========================================
   迅凯催化风格 - 通用样式调整
   ======================================== */
.section {
  padding: 60px 0;
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-dark);
  text-align: center;
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 15px;
  color: var(--text-medium);
  text-align: center;
  margin-bottom: 32px;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 40px;
}

/* 企业简介区调整 */
.about-preview {
  background-color: #ffffff;
}

.about-preview-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-preview-text .section-title {
  text-align: left;
  margin-bottom: 20px;
}

.about-preview-text .section-subtitle {
  text-align: left;
  margin-bottom: 30px;
  color: var(--primary-color);
  font-weight: 600;
}

.about-preview-desc {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-medium);
  margin-bottom: 40px;
}

.about-preview-image {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 120, 215, 0.15);
}

.about-preview-image img {
  width: 100%;
  height: 450px;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.about-preview-image:hover img {
  transform: scale(1.05);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 36px;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  border-radius: 50px;
  text-decoration: none;
  transition: all 0.3s ease;
  border: none;
}

.btn-outline:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 120, 215, 0.3);
  color: #ffffff;
}

/* 产品服务展示区调整 */
.products-preview {
  background-color: var(--bg-light);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 50px;
  align-items: stretch;
}

.product-card {
  background-color: #ffffff;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  transition: all 0.4s ease;
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 50px rgba(0, 120, 215, 0.15);
}

.product-image {
  position: relative;
  overflow: hidden;
  height: 260px;
  background: #f8f8f8;
  display: flex;
  align-items: center;
  justify-content: center;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  transition: transform 0.6s ease;
  padding: 20px;
  box-sizing: border-box;
}

.product-card:hover .product-image img {
  transform: scale(1.08);
}

.product-content {
  padding: 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.product-name {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 12px;
  transition: color 0.3s ease;
}

.product-card:hover .product-name {
  color: var(--primary-color);
}

.product-desc {
  font-size: 14px;
  color: var(--text-medium);
  line-height: 1.7;
  margin-bottom: 20px;
  min-height: 50px;
}

.btn-sm {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background-color: transparent;
  color: var(--primary-color);
  font-size: 14px;
  font-weight: 600;
  border: 2px solid var(--primary-color);
  border-radius: 50px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.btn-sm:hover {
  background-color: var(--primary-color);
  color: #ffffff;
}

.product-content .section-footer,
.product-content > a:last-child {
  margin-top: auto;
}

.section-footer {
  text-align: center;
  margin-top: 50px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 40px;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: #ffffff;
  font-size: 16px;
  font-weight: 600;
  border-radius: 50px;
  text-decoration: none;
  transition: all 0.3s ease;
  border: none;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 35px rgba(0, 120, 215, 0.35);
  color: #ffffff;
}

/* 产品下拉卡片样式 */
.product-desc-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
}

.product-desc-row .product-desc {
  flex: 1;
  margin-bottom: 0;
}

.product-dropdown-toggle {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-color);
  border-radius: 50%;
  background-color: transparent;
  color: var(--text-medium);
  cursor: pointer;
  transition: all 0.3s ease;
  flex-shrink: 0;
}

.product-dropdown-toggle:hover {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: #ffffff;
}

.product-card.open .product-dropdown-toggle {
  transform: rotate(180deg);
}

.product-dropdown-content {
  display: none;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
  animation: slideDown 0.3s ease;
}

.product-card.open .product-dropdown-content {
  display: block;
}

.product-items-content {
  display: none;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.product-card.open .product-items-content {
  display: block;
}

/* 子项目网格：每行2个 */
.product-items-content .series-items-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 12px;
}

.product-items-content .series-item-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px;
  background: #f8f9fa;
  border-radius: 8px;
  text-align: center;
}

.product-items-content .series-item-card img {
  width: 100%;
  height: 140px;
  object-fit: contain;
  object-position: center;
  border-radius: 6px;
  margin-bottom: 8px;
  background: #f8f8f8;
  padding: 10px;
  box-sizing: border-box;
}

.product-items-content .series-item-card span {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-dark);
}

.product-items-content .series-section-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
  margin: 16px 0 8px 0;
  padding-left: 4px;
}

.product-items-content .series-empty {
  text-align: center;
  color: #999;
  padding: 20px;
  font-size: 14px;
}

.product-more-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
  color: var(--primary-color);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.3s ease;
  width: 100%;
  justify-content: flex-end;
}


/* 产品中心简洁列表布局 */
.product-center-simple-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
}

.product-simple-card {
  text-align: left;
}

.product-simple-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 12px;
  line-height: 1.4;
}

.product-simple-divider {
  border-top: 1px dashed var(--border-color);
  margin-bottom: 16px;
}

.product-simple-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.product-simple-list li {
  font-size: 14px;
  color: var(--text-medium);
  line-height: 2.2;
  padding: 4px 0;
  border-bottom: 1px solid #f0f0f0;
}

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

/* 响应式 */
@media (max-width: 1024px) {
  .product-center-simple-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
  }
}

@media (max-width: 768px) {
  .product-center-simple-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }
}

@media (max-width: 480px) {
  .product-center-simple-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

.product-more-link:hover {
  color: var(--secondary-color);
  gap: 10px;
}

.product-more-link i {
  font-size: 12px;
  transition: transform 0.3s ease;
}

.product-more-link:hover i {
  transform: translateX(4px);
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.product-series {
  margin-top: 16px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.product-series:first-child {
  margin-top: 16px;
}

.series-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background-color: rgba(0, 120, 215, 0.03);
  border: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
  color: var(--text-dark);
  transition: all 0.3s ease;
}

.series-toggle:hover {
  background-color: rgba(0, 120, 215, 0.08);
}

.series-toggle i {
  font-size: 12px;
  color: var(--text-medium);
  transition: transform 0.3s ease;
}

.product-series.open .series-toggle i {
  transform: rotate(90deg);
}

.series-content {
  display: none;
  padding: 12px;
  background-color: #ffffff;
}

.product-series.open .series-content {
  display: block;
}

.series-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 12px;
}

.series-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px;
  border-radius: 8px;
  background-color: rgba(0, 120, 215, 0.03);
  transition: all 0.3s ease;
  cursor: pointer;
}

.series-item:hover {
  background-color: rgba(0, 120, 215, 0.12);
  transform: translateY(-2px);
}

.series-item img {
  width: 80px;
  height: 80px;
  object-fit: contain;
  border-radius: 6px;
  margin-bottom: 8px;
  background: #f8f8f8;
  padding: 4px;
}

.series-item span {
  font-size: 12px;
  color: var(--text-dark);
  text-align: center;
  font-weight: 500;
}

.series-group {
  margin-bottom: 8px;
}

.series-toggle-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 8px;
  font-size: 14px;
  color: var(--text-dark);
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: left;
}

.series-toggle-btn:hover {
  background: #e9ecef;
  border-color: #dee2e6;
}

.series-toggle-btn i {
  color: var(--text-medium);
  transition: transform 0.3s ease;
  font-size: 12px;
}

.series-group.open .series-toggle-btn i {
  transform: rotate(90deg);
}

.series-items-grid {
  display: none;
  padding: 12px;
  gap: 12px;
  grid-template-columns: repeat(2, 1fr);
  align-items: start;
}

.series-group.open .series-items-grid {
  display: grid;
}

.series-item-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 12px;
  border-radius: 8px;
  background-color: rgba(0, 120, 215, 0.03);
  transition: all 0.3s ease;
  cursor: pointer;
  box-sizing: border-box;
}

.series-item-card:hover {
  background-color: rgba(0, 120, 215, 0.12);
  transform: translateY(-2px);
}

.series-item-card img {
  width: 80px;
  height: 80px;
  object-fit: contain;
  border-radius: 6px;
  margin-bottom: 8px;
  flex-shrink: 0;
  background: #f8f8f8;
  padding: 4px;
}

.series-item-card span {
  font-size: 12px;
  color: var(--text-dark);
  text-align: center;
  font-weight: 500;
  word-break: keep-all;
  white-space: normal;
  line-height: 1.4;
  max-width: 100%;
  margin-top: 4px;
}

.series-item-placeholder {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  margin-bottom: 8px;
  flex-shrink: 0;
  background-color: #f0f0f0;
  color: #999;
  font-size: 11px;
}

.series-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 30px 20px;
  color: #999;
  font-size: 14px;
}

.series-item-pdf {
  display: flex;
  flex-direction: row;
  gap: 4px;
  margin-top: 8px;
  justify-content: center;
  align-items: center;
  width: 100%;
}

.pdf-view-btn, .pdf-download-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 3px 8px;
  font-size: 10px;
  border-radius: 3px;
  text-decoration: none;
  transition: all 0.2s ease;
  white-space: nowrap;
  flex: 1;
  max-width: 55px;
  height: 22px;
  line-height: 1;
}

.pdf-view-btn {
  background-color: rgba(0, 120, 215, 0.1);
  color: var(--primary-color);
  border: 1px solid rgba(0, 120, 215, 0.25);
}

.pdf-view-btn:hover {
  background-color: rgba(0, 120, 215, 0.2);
}

.pdf-download-btn {
  background-color: #e74c3c;
  color: #ffffff;
}

.pdf-download-btn:hover {
  background-color: #c0392b;
}

.pdf-view-btn i, .pdf-download-btn i {
  font-size: 9px;
}

.product-download-section {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--border-color);
  text-align: center;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 32px;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: #ffffff;
  font-size: 14px;
  font-weight: 600;
  border-radius: 50px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.download-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 120, 215, 0.3);
}

.product-docs-section {
  background: #f8f9fa;
  padding: 50px 0;
  margin-top: 60px;
}

.product-docs-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 30px;
  padding-left: 15px;
  border-left: 5px solid var(--accent-red);
}

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

.product-doc-item {
  background: #fff;
  padding: 20px 25px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.3s ease;
  text-decoration: none;
  color: var(--text-dark);
}

.product-doc-item:hover {
  background: #f0f4f8;
  transform: translateX(5px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

.product-doc-item .doc-info {
  display: flex;
  align-items: center;
  gap: 15px;
}

.product-doc-item .doc-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  flex-shrink: 0;
}

.product-doc-item .doc-name {
  font-size: 18px;
  font-weight: 500;
}

.product-doc-item .doc-download {
  color: var(--primary-color);
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 5px;
  flex-shrink: 0;
}

.product-doc-item:hover .doc-download {
  color: var(--primary-dark);
}

@media (max-width: 768px) {
  .product-docs-section {
    padding: 30px 0;
    margin-top: 40px;
  }
  
  .product-docs-title {
    font-size: 22px;
    margin-bottom: 20px;
  }
  
  .product-doc-item {
    padding: 15px;
  }
  
  .product-doc-item .doc-name {
    font-size: 15px;
  }
  
  .product-doc-item .doc-icon {
    width: 36px;
    height: 36px;
    font-size: 16px;
  }
}

.product-docs-section-inline {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
}

.product-card > .product-docs-section-inline {
  display: none;
  padding: 16px 28px 0;
  background: #fff;
}

.product-card > .product-docs-section-inline[style*="block"] {
  display: block;
}
.product-docs-inline-wrapper {
  background: #fff;
  border-radius: 8px;
  overflow: hidden;
}

.product-docs-inline-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-dark);
  padding: 15px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-left: 5px solid var(--accent-red);
  margin-bottom: 0;
  cursor: pointer;
}

.product-docs-inline-title:hover {
  background: #f8f9fa;
}

.product-docs-inline-title .doc-title-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.product-docs-inline-title i {
  color: var(--accent-red);
}

.product-docs-inline-title .doc-title-arrow {
  color: #999;
  font-size: 14px;
  transition: transform 0.3s ease;
}

.product-docs-inline-title.expanded .doc-title-arrow {
  transform: rotate(180deg);
}

.product-docs-inline-list {
  display: none;
  flex-direction: column;
}

.product-docs-inline-list.expanded {
  display: flex;
}

.product-doc-inline-item {
  display: flex;
  align-items: center;
  padding: 15px 20px;
  text-decoration: none;
  color: var(--text-dark);
  transition: all 0.3s ease;
  border-bottom: 1px solid #f0f0f0;
  cursor: pointer;
}

.product-doc-inline-item:last-child {
  border-bottom: none;
}

.product-doc-inline-item:hover {
  background: #f8f9fa;
}

.product-doc-inline-item .doc-inline-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #dc3545 0%, #c82333 100%);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
  flex-shrink: 0;
  margin-right: 15px;
}

.product-doc-inline-item .doc-inline-name {
  flex: 1;
  font-size: 16px;
}

.product-doc-inline-item:first-child .doc-inline-name {
  color: var(--accent-red);
  font-weight: 500;
}

.product-doc-inline-item:hover .doc-inline-name {
  color: var(--accent-red);
}

.product-doc-inline-item .doc-inline-download {
  padding: 6px 12px;
  background: #dc3545;
  color: #fff;
  border-radius: 4px;
  font-size: 12px;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: background 0.3s ease;
}

.product-doc-inline-item .doc-inline-download:hover {
  background: #c82333;
}

@media (max-width: 768px) {
  .product-docs-section-inline {
    margin-top: 15px;
    padding-top: 15px;
  }
  
  .product-docs-inline-title {
    font-size: 14px;
  }
  
  .product-doc-inline-item {
    padding: 10px 12px;
  }
  
  .product-doc-inline-item .doc-inline-name {
    font-size: 13px;
  }
  
  .product-doc-inline-item .doc-inline-icon {
    width: 28px;
    height: 28px;
    font-size: 12px;
  }
}

/* 数据统计区调整 */
.stats-section {
  background: #f8f9fa !important;
  padding: 60px 0;
  position: relative;
  overflow: hidden;
}

.stats-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: none;
  pointer-events: none;
}

.stats-section .container {
  position: relative;
  z-index: 1;
}

.stats-grid {
  display: grid !important;
  grid-template-columns: repeat(3, 1fr) !important;
  gap: 40px;
  text-align: center;
}

.stat-item {
  padding: 28px 20px !important;
  position: relative;
  background: #ffffff !important;
  border: 1px solid #e0e0e0 !important;
  border-radius: 16px !important;
  backdrop-filter: blur(10px);
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

.stat-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(26, 54, 93, 0.1), transparent);
  transition: left 0.6s ease;
  z-index: 0;
}

.stat-item > * {
  position: relative;
  z-index: 1;
}

.stat-item:hover {
  background: #ffffff !important;
  border-color: #1a365d !important;
  transform: translateY(-8px);
  box-shadow: 0 20px 50px rgba(26, 54, 93, 0.2);
}

.stat-item:hover::before {
  left: 100%;
}

.stat-item:hover .stat-number {
  color: #1a365d !important;
  text-shadow: 0 0 25px rgba(26, 54, 93, 0.3);
}

.stat-item:hover .stat-icon {
  background-color: #1a365d !important;
  color: #ffffff;
  transform: scale(1.1) rotate(360deg);
  box-shadow: 0 10px 30px rgba(26, 54, 93, 0.4);
}

.stat-item::after {
  content: '';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 80px;
  background-color: #e0e0e0;
}

.stat-item:last-child::after {
  display: none;
}

.stat-icon {
  width: 44px !important;
  height: 44px !important;
  margin: 0 auto 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: transparent !important;
  border: 2px solid #1a365d !important;
  border-radius: 50%;
  color: #1a365d;
  font-size: 20px;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.stat-number {
  font-size: 36px !important;
  font-weight: 700;
  color: #1a365d !important;
  line-height: 1;
  margin-bottom: 8px;
  transition: all 0.4s ease;
  text-shadow: none;
}

.stat-label {
  font-size: 16px !important;
  font-weight: 600;
  color: #333333 !important;
  margin-bottom: 4px;
  letter-spacing: 1px;
  text-shadow: none;
}

.stat-unit {
  font-size: 14px;
  color: #666666 !important;
  text-shadow: none;
}

/* 联系方式区调整 */
.contact-preview {
  background-color: #ffffff;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-bottom: 50px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  padding: 32px;
  background-color: var(--bg-light);
  border-radius: 12px;
  transition: all 0.3s ease;
}

.contact-item:hover {
  background-color: #ffffff;
  box-shadow: 0 10px 30px rgba(0, 120, 215, 0.1);
  transform: translateY(-5px);
}

.contact-icon {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  border-radius: 12px;
  color: #ffffff;
  font-size: 20px;
}

.contact-info h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 8px;
}

.contact-info p {
  font-size: 15px;
  color: var(--text-medium);
  line-height: 1.6;
  margin: 0;
}

/* 页脚样式调整 */
.footer {
  background-color: var(--bg-dark);
  color: #ffffff;
  padding-top: 80px;
}

.footer-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 60px;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 60px;
  padding-bottom: 60px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-title {
  font-size: 18px;
  font-weight: 600;
  color: #ffffff;
  margin: 0 0 24px 0;
  padding: 0;
  line-height: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-title i {
  color: var(--accent-color);
  font-size: 18px;
  line-height: 24px;
  height: 24px;
  width: 18px;
  text-align: center;
  flex-shrink: 0;
}

.footer-info {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0 !important;
}

.footer-info li {
  display: flex;
  align-items: center;
  gap: 12px;
  height: auto;
  min-height: 40px;
  margin: 0;
  padding: 4px 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
  line-height: 1.5;
}

.footer-info li span {
  display: block;
  height: auto;
  line-height: 1.5;
  flex: 1;
  min-width: 0;
  white-space: normal;
  word-break: break-word;
  overflow-wrap: break-word;
}

.footer-info i {
  color: var(--accent-color);
  flex-shrink: 0;
  font-size: 14px;
  line-height: 1.5;
  height: auto;
  width: 14px;
  text-align: center;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0 !important;
}

.footer-links li {
  display: flex;
  align-items: center;
  height: 40px;
  margin: 0;
  padding: 0;
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.3s ease;
  display: flex;
  align-items: center;
  height: 40px;
  line-height: 40px;
}

.footer-links a:hover {
  color: var(--accent-color);
}

.footer-social {
  display: flex;
  gap: 12px;
}

.social-link,
.footer-social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  color: #ffffff;
  font-size: 16px;
  text-decoration: none;
  transition: all 0.3s ease;
  cursor: pointer;
}

.social-link:hover,
.footer-social-link:hover {
  background-color: var(--accent-color);
  transform: translateY(-3px);
  color: #ffffff;
}

.footer-bottom {
  padding: 24px 0;
  text-align: center;
}

.copyright {
  color: rgba(255, 255, 255, 0.5);
  font-size: 14px;
  margin: 6px 0;
  line-height: 1.6;
}

/* 动画类 */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.animate-on-scroll.animated {
  opacity: 1;
  transform: translateY(0);
}

.stagger-0 { transition-delay: 0.1s; }
.stagger-1 { transition-delay: 0.2s; }
.stagger-2 { transition-delay: 0.3s; }

/* 工具类 */
.img-fluid {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ========================================
   响应式媒体查询 - 完整移动端适配
   ======================================== */

/* 大屏幕 (≥1440px) */
@media (min-width: 1440px) {
  nav.navbar .nav-links {
    gap: 32px;
  }
  
  nav.navbar .nav-actions {
    gap: 20px;
  }
}

/* 中等屏幕 (1200px - 1439px) */
@media (max-width: 1439px) {
  .nav-container {
    padding: 0 20px !important;
    max-width: 100% !important;
  }
  
  nav.navbar .nav-links {
    gap: 18px !important;
  }
  
  nav.navbar .nav-link {
    font-size: 14px;
  }
  
  nav.navbar .nav-actions {
    gap: 10px !important;
    margin-left: 8px !important;
  }
  
  nav.navbar .nav-phone span {
    font-size: 12px;
  }
  
  nav.navbar .nav-contact-btn {
    padding: 7px 14px !important;
    font-size: 12px !important;
  }
  
  nav.navbar .contact-arrow {
    width: 22px !important;
    height: 22px !important;
    font-size: 10px !important;
  }
  
  .logo-cn {
    font-size: 15px !important;
  }
  
  .logo-en {
    font-size: 10px !important;
  }
  
  .logo-badge {
    margin-left: 12px !important;
    padding: 4px 8px !important;
  }
  
  .badge-hitachi {
    font-size: 11px !important;
  }
  
  .badge-chinese {
    font-size: 8px !important;
  }
}

/* 中小屏幕 (1100px - 1199px) */
@media (max-width: 1199px) {
  .nav-container {
    padding: 0 15px !important;
  }
  
  nav.navbar .nav-links {
    gap: 14px !important;
  }
  
  nav.navbar .nav-link {
    font-size: 13px;
    padding: 6px 0;
  }
  
  nav.navbar .nav-phone {
    display: none !important;
  }
  
  nav.navbar .nav-actions {
    gap: 8px !important;
    margin-left: 5px !important;
  }
  
  .logo-cn {
    font-size: 13px !important;
  }
  
  .logo-en {
    font-size: 9px !important;
    padding-left: 6px !important;
  }
  
  .logo-icon {
    width: 36px !important;
    height: 36px !important;
  }
  
  .logo-badge {
    margin-left: 8px !important;
    padding: 3px 6px !important;
  }
  
  .badge-hitachi {
    font-size: 10px !important;
  }
  
  .badge-chinese {
    font-size: 7px !important;
  }
}

/* 小屏幕 (992px - 1099px) */
@media (max-width: 1099px) {
  nav.navbar .nav-links {
    gap: 10px !important;
  }
  
  nav.navbar .nav-link {
    font-size: 12px;
  }
  
  nav.navbar .nav-contact-btn {
    padding: 6px 12px !important;
    font-size: 11px !important;
  }
  
  .logo-cn {
    font-size: 12px !important;
  }
  
  .logo-en {
    display: none !important;
  }
  
  .logo-badge {
    display: none !important;
  }
  
  .lang-select {
    padding: 5px 8px !important;
    font-size: 12px !important;
  }
}

/* 平板屏幕 (768px - 991px) */
@media (max-width: 991px) {
  nav.navbar .nav-menu {
    display: none !important;
  }
  
  nav.navbar .nav-toggle {
    display: flex !important;
  }
  
  .nav-container {
    justify-content: space-between !important;
  }
  
  nav.navbar .nav-logo {
    max-width: 200px !important;
  }
  
  nav.navbar .nav-actions {
    display: none !important;
  }
  
  nav.navbar .nav-phone {
    display: none !important;
  }
  
  /* Hero区域 */
  .hero-section {
    height: 75vh !important;
    min-height: 500px !important;
  }
  
  .hero-title {
    font-size: 36px !important;
    line-height: 1.2 !important;
  }
  
  .hero-subtitle {
    font-size: 16px !important;
    line-height: 1.6 !important;
  }
  
  /* 产品卡片 */
  .products-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 20px !important;
  }
  
  .product-image {
    height: 220px !important;
  }
  
  /* 统计数据 */
  .stats-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 20px !important;
  }
  
  .stat-item {
    padding: 35px 20px !important;
  }
  
  /* 联系方式 */
  .contact-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 20px !important;
  }
  
  /* 页脚 */
  .footer-content {
    grid-template-columns: 1fr 1fr !important;
    gap: 30px !important;
  }
  
  .container {
    padding: 0 20px !important;
  }
}

/* 手机屏幕 (<768px) */
@media (max-width: 767px) {
  /* 导航栏 - 白色背景风格 */
  nav.navbar {
    min-height: 60px !important;
    height: auto !important;
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    z-index: 1030 !important;
    background-color: #ffffff !important;
    box-shadow: 0 1px 8px rgba(0, 0, 0, 0.08) !important;
  }
  
  nav.navbar.scrolled {
    min-height: 55px !important;
    height: auto !important;
    background-color: #ffffff !important;
  }
  
  .nav-container {
    min-height: 60px !important;
    height: auto !important;
    padding: 0 15px !important;
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    flex-wrap: nowrap !important;
    gap: 10px !important;
  }
  
  nav.navbar .nav-logo {
    max-width: 180px !important;
    gap: 8px !important;
    flex-shrink: 0 !important;
  }
  
  .logo-icon {
    width: 32px !important;
    height: 32px !important;
  }
  
  .logo-cn {
    font-size: 12px !important;
    white-space: nowrap !important;
    color: var(--primary-blue) !important;
  }
  
  .logo-en {
    display: none !important;
  }
  
  .logo-badge {
    display: none !important;
  }
  
  /* 移动端操作区容器 */
  .nav-mobile-actions {
    display: flex !important;
    align-items: center !important;
    gap: 4px !important;
    flex-shrink: 0 !important;
  }
  
  /* 移动端搜索按钮 */
  .nav-mobile-search {
    display: flex !important;
    width: 38px !important;
    height: 38px !important;
    font-size: 18px !important;
    color: var(--primary-blue) !important;
    background: transparent !important;
    border: none !important;
    cursor: pointer !important;
    align-items: center !important;
    justify-content: center !important;
  }
  
  /* 移动端语言选择 */
  .nav-mobile-lang {
    display: block !important;
    position: relative !important;
    z-index: 100 !important;
  }

  .nav-mobile-lang .lang-dropdown {
    position: relative !important;
  }

  .nav-mobile-lang .lang-select {
    display: flex !important;
    align-items: center !important;
    flex-direction: row !important;
    padding: 6px 10px !important;
    font-size: 14px !important;
    color: var(--primary-blue) !important;
    background: transparent !important;
    border: none !important;
    gap: 4px !important;
    cursor: pointer !important;
  }

  .nav-mobile-lang .lang-select i {
    font-size: 10px !important;
    transition: transform 0.3s ease !important;
  }

  .nav-mobile-lang .lang-dropdown.open .lang-select i {
    transform: rotate(180deg) !important;
  }

  .nav-mobile-lang .lang-options {
    position: absolute !important;
    top: 100% !important;
    right: 0 !important;
    min-width: 70px !important;
    margin-top: 6px !important;
    background-color: #ffffff !important;
    border: 1px solid rgba(0, 120, 215, 0.15) !important;
    border-radius: 8px !important;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1) !important;
    overflow: hidden !important;
    opacity: 0 !important;
    visibility: hidden !important;
    transform: translateY(-10px) !important;
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease !important;
    pointer-events: none !important;
    z-index: 9999 !important;
  }

  .nav-mobile-lang .lang-dropdown.open .lang-options {
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) !important;
    pointer-events: auto !important;
  }

  .nav-mobile-lang .lang-option {
    display: block !important;
    color: var(--text-dark) !important;
    font-size: 13px !important;
    padding: 10px 16px !important;
    text-decoration: none !important;
    transition: all 0.2s ease !important;
  }

  .nav-mobile-lang .lang-option:hover,
  .nav-mobile-lang .lang-option.active {
    background-color: rgba(255, 69, 0, 0.1) !important;
    color: var(--accent-color) !important;
  }
  
  /* 汉堡菜单按钮 */
  nav.navbar .nav-toggle {
    display: flex !important;
    width: 38px !important;
    height: 38px !important;
    font-size: 22px !important;
    color: var(--primary-blue) !important;
    background: transparent !important;
    border: none !important;
    flex-shrink: 0 !important;
    align-items: center !important;
    justify-content: center !important;
  }
  
  nav.navbar.scrolled .nav-toggle {
    color: var(--primary-blue) !important;
  }
  
  /* 桌面导航隐藏 */
  nav.navbar .nav-menu {
    display: none !important;
  }
  
  nav.navbar .nav-actions {
    display: none !important;
  }
  
  /* Hero区域手机端适配 */
  .hero-section {
    height: 65vh !important;
    min-height: 400px !important;
    padding-top: 60px !important;
  }
  
  .hero-container {
    padding: 0 15px !important;
    height: 100% !important;
  }
  
  .hero-content {
    padding-top: 0 !important;
    max-width: 100% !important;
    width: 100% !important;
  }
  
  .hero-title {
    font-size: 26px !important;
    line-height: 1.3 !important;
    margin-bottom: 14px !important;
  }
  
  .hero-subtitle {
    font-size: 14px !important;
    line-height: 1.6 !important;
    margin-bottom: 20px !important;
    opacity: 0.9 !important;
  }
  
  .hero-btn {
    padding: 6px 6px 6px 20px !important;
  }
  
  .hero-btn-text {
    font-size: 14px !important;
  }
  
  .hero-btn-icon {
    width: 34px !important;
    height: 34px !important;
    font-size: 13px !important;
  }
  
  .swiper-indicators {
    bottom: 15px !important;
  }
  
  .indicator-dot {
    width: 10px !important;
    height: 10px !important;
  }
  
  .swiper-indicator.active .indicator-dot {
    width: 14px !important;
    height: 14px !important;
  }
  
  .indicator-connector {
    width: 25px !important;
  }
  
  /* 产品卡片手机端适配 */
  .products-grid {
    grid-template-columns: 1fr !important;
    gap: 16px !important;
  }
  
  .product-card {
    border-radius: 8px !important;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.05) !important;
  }
  
  .product-card:hover {
    transform: none !important;
    box-shadow: 0 4px 20px rgba(0, 120, 215, 0.1) !important;
  }
  
  .product-image {
    height: 160px !important;
  }
  
  .product-content {
    padding: 16px !important;
  }
  
  .product-name {
    font-size: 17px !important;
    margin-bottom: 8px !important;
    line-height: 1.3 !important;
  }
  
  .product-desc {
    font-size: 13px !important;
    line-height: 1.6 !important;
  }
  
  .product-desc-row {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 8px !important;
  }
  
  .product-dropdown-toggle {
    align-self: flex-end !important;
  }
  
  .series-grid {
    grid-template-columns: repeat(2, 1fr) !important;
    gap: 8px !important;
  }
  
  .series-item {
    padding: 8px !important;
  }
  
  .series-item img {
    width: 100% !important;
    height: 60px !important;
    margin-bottom: 6px !important;
  }
  
  .series-item span {
    font-size: 11px !important;
    line-height: 1.3 !important;
  }
  
  .series-toggle {
    padding: 12px 14px !important;
    font-size: 14px !important;
  }
  
  .series-content {
    padding: 10px !important;
  }
  
  .download-btn {
    padding: 10px 24px !important;
    font-size: 13px !important;
  }
  
  /* 企业简介手机端适配 */
  .about-preview-content {
    grid-template-columns: 1fr !important;
    gap: 20px !important;
  }
  
  .about-preview-image img {
    height: 220px !important;
  }
  
  .about-preview-text .section-title {
    font-size: 22px !important;
  }
  
  .about-preview-text .section-subtitle {
    font-size: 14px !important;
  }
  
  .about-preview-desc {
    font-size: 14px !important;
    line-height: 1.7 !important;
    margin-bottom: 24px !important;
  }
  
  .btn-outline {
    padding: 12px 28px !important;
    font-size: 14px !important;
  }
  
  /* 统计数据手机端适配 */
  .stats-grid {
    grid-template-columns: repeat(3, 1fr) !important;
    gap: 10px !important;
  }

  .stat-item {
    padding: 16px 8px !important;
    border-radius: 10px !important;
  }

  .stat-item::after {
    display: none !important;
  }

  .stat-icon {
    width: 32px !important;
    height: 32px !important;
    font-size: 14px !important;
    margin-bottom: 8px !important;
  }

  .stat-number {
    font-size: 22px !important;
    margin-bottom: 4px !important;
  }

  .stat-label {
    font-size: 11px !important;
    margin-bottom: 2px !important;
  }

  .stat-unit {
    font-size: 10px !important;
  }
  
  /* 联系方式手机端适配 */
  .contact-grid {
    grid-template-columns: 1fr !important;
    gap: 15px !important;
  }
  
  .contact-item {
    padding: 20px !important;
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 12px !important;
  }
  
  .contact-icon {
    width: 48px !important;
    height: 48px !important;
    font-size: 20px !important;
  }
  
  .contact-info h3 {
    font-size: 16px !important;
  }
  
  .contact-info p {
    font-size: 14px !important;
  }
  
  /* 页脚手机端适配 */
  .footer {
    padding-top: 40px !important;
  }
  
  .footer-content {
    grid-template-columns: 1fr !important;
    gap: 25px !important;
    padding-bottom: 30px !important;
  }
  
  .footer-title {
    font-size: 16px !important;
    margin: 0 0 16px 0 !important;
    height: 22px !important;
    line-height: 22px !important;
  }
  
  .footer-title i {
    font-size: 16px !important;
    line-height: 22px !important;
    height: 22px !important;
    width: 16px !important;
  }
  
  .footer-info li {
    font-size: 13px !important;
    height: auto !important;
    min-height: 36px !important;
    line-height: 1.5 !important;
    margin: 0 !important;
    padding: 4px 0 !important;
    display: flex !important;
    align-items: flex-start !important;
    gap: 6px !important;
  }

  .footer-info li span {
    line-height: 1.5 !important;
    white-space: normal !important;
    word-break: break-word !important;
    overflow-wrap: break-word !important;
  }
  
  .footer-info i {
    font-size: 13px !important;
    line-height: 1.5 !important;
    height: auto !important;
    flex-shrink: 0 !important;
    padding-top: 2px !important;
  }
  
  .footer-links li {
    height: 36px !important;
    margin: 0 !important;
    padding: 0 !important;
  }
  
  .footer-links a {
    font-size: 13px !important;
    height: 36px !important;
    line-height: 36px !important;
  }
  
  .footer-bottom {
    padding: 16px 0 !important;
  }
  
  .copyright {
    font-size: 12px !important;
  }
  
  /* 通用样式 */
  .section {
    padding: 45px 0 !important;
  }
  
  .section-title {
    font-size: 24px !important;
    margin-bottom: 12px !important;
  }
  
  .section-subtitle {
    font-size: 13px !important;
    margin-bottom: 30px !important;
  }
  
  .container {
    padding: 0 15px !important;
    max-width: 100% !important;
  }
  
  .footer-container {
    padding: 0 15px !important;
    max-width: 100% !important;
  }
  
  /* 触摸优化 */
  .btn-primary {
    padding: 12px 28px !important;
    font-size: 14px !important;
    min-height: 44px !important;
  }
  
  .btn-primary:hover {
    transform: none !important;
  }
  
  .stat-item:hover {
    transform: none !important;
  }
  
  .contact-item:hover {
    transform: none !important;
  }
  
  /* iPhone安全区域 */
  nav.navbar {
    padding-top: env(safe-area-inset-top) !important;
  }
  
  .footer-bottom {
    padding-bottom: calc(16px + env(safe-area-inset-bottom)) !important;
  }
}

/* 小手机屏幕 (<480px) */
@media (max-width: 479px) {
  .hero-section {
    height: 55vh !important;
    min-height: 350px !important;
  }
  
  .hero-title {
    font-size: 22px !important;
  }
  
  .hero-subtitle {
    font-size: 13px !important;
  }
  
  .product-image {
    height: 140px !important;
  }
  
  .product-name {
    font-size: 16px !important;
  }
  
  .stat-number {
    font-size: 30px !important;
  }
  
  .container {
    padding: 0 12px !important;
  }
}

/* 语言下拉菜单悬停效果 - 红色 */
/* 语言选择按钮悬停效果 - 只变文字颜色 */
nav.navbar .lang-select:hover {
  color: #FF4500 !important;
  background-color: transparent !important;
}

nav.navbar.scrolled .lang-select:hover {
  color: #FF4500 !important;
  background-color: transparent !important;
}

/* 下拉菜单项悬停效果 - 只变文字颜色 */
nav.navbar #langOptions .lang-option:hover,
nav.navbar #langOptionsMobile .lang-option:hover,
nav.navbar .lang-options .lang-option:hover {
  color: #FF4500 !important;
  background-color: transparent !important;
}

#langOptions .lang-option:hover,
#langOptionsMobile .lang-option:hover,
.lang-options .lang-option:hover {
  color: #FF4500 !important;
  background-color: transparent !important;
}

/* 下拉菜单项激活状态 */
nav.navbar #langOptions .lang-option.active,
nav.navbar #langOptionsMobile .lang-option.active,
nav.navbar .lang-options .lang-option.active {
  color: #FF4500 !important;
}

#langOptions .lang-option.active,
#langOptionsMobile .lang-option.active,
.lang-options .lang-option.active {
  color: #FF4500 !important;
}

/* 移动端侧边栏语言按钮悬停效果 - 只变文字颜色 */
.nav-menu-mobile .mobile-lang-options button.active,
.nav-menu-mobile .mobile-lang-options button:hover {
  color: #FF4500 !important;
  background-color: transparent !important;
  border-color: #FF4500 !important;
}

/* ========================================
   搜索弹窗
   ======================================== */
.search-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10000;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.search-modal.active {
  pointer-events: auto;
  opacity: 1;
  visibility: visible;
}

.search-modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(10, 37, 64, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.search-modal-content {
  position: relative;
  max-width: 1200px;
  width: calc(100% - 40px);
  margin: 0 auto;
  padding: 80px 20px 0 20px;
  transform: translateY(-20px);
  transition: transform 0.3s ease;
}

.search-modal.active .search-modal-content {
  transform: translateY(0);
}

.search-form {
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #e8f0fe 0%, #f0f7ff 100%);
  border: 2px solid #c5d6f0;
  border-radius: 50px;
  padding: 8px 8px 8px 32px;
  box-shadow: 0 10px 40px rgba(0, 120, 215, 0.15);
  transition: all 0.3s ease;
}

.search-form:focus-within {
  border-color: #0078D7;
  box-shadow: 0 10px 50px rgba(0, 120, 215, 0.3);
}

.search-input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-size: 18px;
  color: #333;
  padding: 16px 0;
  font-family: inherit;
}

.search-input::placeholder {
  color: #6b7280;
  font-size: 18px;
}

.search-submit-btn {
  width: 56px;
  height: 56px;
  min-width: 56px;
  border: none;
  background: transparent;
  color: #0078D7;
  font-size: 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.3s ease;
}

.search-submit-btn:hover {
  background-color: rgba(0, 120, 215, 0.1);
  color: #005A9E;
  transform: scale(1.05);
}

.search-close-btn {
  position: absolute;
  top: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  border: none;
  background-color: rgba(255, 255, 255, 0.9);
  color: #333;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.search-close-btn:hover {
  background-color: #FF4500;
  color: #ffffff;
  transform: rotate(90deg);
}

@media (max-width: 768px) {
  .search-modal-content {
    padding-top: 70px;
  }

  .search-form {
    padding: 6px 6px 6px 20px;
  }

  .search-input {
    font-size: 16px;
    padding: 12px 0;
  }

  .search-input::placeholder {
    font-size: 16px;
  }

  .search-submit-btn {
    width: 44px;
    height: 44px;
    min-width: 44px;
    font-size: 18px;
  }

  .search-close-btn {
    top: 20px;
    right: 15px;
    width: 36px;
    height: 36px;
    font-size: 16px;
  }
}

.search-results {
  margin-top: 30px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(0, 120, 215, 0.15);
  overflow: hidden;
  display: none;
}

.search-results-header {
  padding: 16px 24px;
  background: linear-gradient(135deg, #0078D7 0%, #106EBE 100%);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
}

.search-results-count {
  display: flex;
  align-items: center;
  gap: 8px;
}

.search-results-list {
  max-height: 400px;
  overflow-y: auto;
}

.search-result-item {
  padding: 20px 24px;
  border-bottom: 1px solid #e5e7eb;
  transition: background-color 0.2s ease;
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover {
  background-color: #f8fafc;
}

.search-result-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.search-result-type {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
  color: #0369a1;
  font-size: 12px;
  font-weight: 600;
  border-radius: 20px;
  white-space: nowrap;
  flex-shrink: 0;
}

.search-result-item[data-type="category"] .search-result-type {
  background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
  color: #dc2626;
}

.search-result-item[data-type="category"] {
  background: linear-gradient(135deg, #fef2f2 0%, #fff5f5 100%);
  border-left: 3px solid #dc2626;
}

.search-result-title {
  font-size: 16px;
  font-weight: 600;
  color: #1f2937;
  line-height: 1.4;
}

.search-result-desc {
  margin-top: 8px;
  font-size: 14px;
  color: #6b7280;
  line-height: 1.5;
}

.search-result-date {
  margin-top: 8px;
  font-size: 13px;
  color: #9ca3af;
}

@media (max-width: 768px) {
  .search-results {
    margin-top: 20px;
  }
  
  .search-results-header {
    padding: 12px 16px;
    font-size: 13px;
  }
  
  .search-result-item {
    padding: 16px;
  }
  
  .search-result-title {
    font-size: 15px;
  }
  
  .search-result-desc {
    font-size: 13px;
  }
}

/* 页脚联系方式对齐修复（仅桌面端） */
@media (min-width: 768px) {
  .footer-content {
    grid-template-columns: minmax(460px, 2fr) repeat(3, minmax(160px, 1fr)) !important;
    gap: 48px !important;
  }
  .footer-info li {
    display: grid !important;
    grid-template-columns: 18px minmax(0, 1fr) !important;
    align-items: start !important;
    gap: 14px !important;
    height: auto !important;
    min-height: 34px !important;
    line-height: 1.55 !important;
    margin-bottom: 12px !important;
  }
  .footer-info li span,
  .footer-info li a {
    display: block !important;
    height: auto !important;
    line-height: 1.55 !important;
    min-width: 0 !important;
    word-break: normal !important;
    overflow-wrap: anywhere !important;
  }
  .footer-info li:has([data-i18n="footer_address"]) span {
    max-width: 34em !important;
  }
}
@media (max-width: 991px) {
  .footer-content {
    grid-template-columns: 1fr 1fr !important;
  }
}
@media (max-width: 767px) {
  .footer-content {
    grid-template-columns: 1fr !important;
  }
}

/* 移动端子项目每行2个 */
@media (max-width: 767px) {
  .product-items-content .series-items-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .product-items-content .series-item-card img {
    height: 100px;
  }
}