html {
      scrollbar-gutter: stable;
      overflow-y: scroll;
    }
    :root {
      --header-topbar-height: 42px;
      --header-navbar-height: 88px;
      --header-height: 130px;
    }
    body {
      padding-top: var(--header-height, 130px) !important;
    }
    .main-header {
      position: fixed !important;
      top: 0 !important;
      left: 0 !important;
      right: 0 !important;
      width: 100% !important;
      z-index: 1000 !important;
      background: transparent !important;
      border-bottom: none !important;
      height: var(--header-height, 130px) !important;
      min-height: var(--header-height, 130px) !important;
      max-height: var(--header-height, 130px) !important;
      display: flex !important;
      flex-direction: column !important;
      padding: 0 !important;
      margin: 0 !important;
      box-shadow: none !important;
      box-sizing: border-box !important;
      transform: translateZ(0) !important;
      -webkit-transform: translateZ(0) !important;
      backface-visibility: hidden !important;
      -webkit-backface-visibility: hidden !important;
    }
    /* 1. TOP CONTACT BAR */
    .top-contact-bar {
      width: 100% !important;
      height: var(--header-topbar-height, 42px) !important;
      min-height: var(--header-topbar-height, 42px) !important;
      max-height: var(--header-topbar-height, 42px) !important;
      background: #18181B !important;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08) !important;
      color: #94A3B8 !important;
      font-size: 13px !important;
      box-sizing: border-box !important;
      display: flex !important;
      align-items: center !important;
      line-height: 1 !important;
      z-index: 1002 !important;
    }
    .top-bar-container {
      max-width: 1200px !important;
      width: 100% !important;
      margin: 0 auto !important;
      padding: 0 1.5rem !important;
      box-sizing: border-box !important;
      height: 100% !important;
      display: flex !important;
      align-items: center !important;
      justify-content: space-between !important;
    }
    .top-bar-social {
      display: flex !important;
      align-items: center !important;
      gap: 14px !important;
      flex-shrink: 0 !important;
    }
    .top-social-item {
      display: inline-flex !important;
      align-items: center !important;
      justify-content: center !important;
      width: 20px !important;
      height: 20px !important;
      flex-shrink: 0 !important;
      color: #94A3B8 !important;
      text-decoration: none !important;
      transition: color 0.2s ease, transform 0.2s ease !important;
    }
    .top-social-item:hover {
      color: #FFFFFF !important;
      transform: translateY(-1px) !important;
    }
    .top-social-item.top-fb:hover { color: #1877F2 !important; }
    .top-social-item.top-tw:hover { color: #FFFFFF !important; }
    .top-social-item.top-lk:hover { color: #0A66C2 !important; }

    .top-bar-contact {
      display: flex !important;
      align-items: center !important;
      gap: 20px !important;
      margin-left: auto !important;
      flex-shrink: 0 !important;
      width: 474px !important;
      min-width: 474px !important;
      max-width: 474px !important;
      justify-content: flex-end !important;
      box-sizing: border-box !important;
    }
    .top-contact-link {
      display: inline-flex !important;
      align-items: center !important;
      gap: 7px !important;
      color: #CBD5E1 !important;
      text-decoration: none !important;
      font-family: var(--font-body, 'Inter', -apple-system, BlinkMacSystemFont, sans-serif) !important;
      font-size: 12.5px !important;
      font-weight: 500 !important;
      white-space: nowrap !important;
      flex-shrink: 0 !important;
      line-height: 1 !important;
      transition: color 0.15s ease !important;
      box-sizing: border-box !important;
    }
    .top-contact-link.top-wa {
      width: 140px !important;
      min-width: 140px !important;
      max-width: 140px !important;
      justify-content: flex-start !important;
    }
    .top-contact-link.top-mail {
      width: 186px !important;
      min-width: 186px !important;
      max-width: 186px !important;
      justify-content: flex-start !important;
    }
    .top-mail-wrap {
      position: relative !important;
      display: inline-flex !important;
      align-items: center !important;
    }
    .top-copied-badge {
      display: none !important;
      position: absolute !important;
      top: calc(100% + 7px) !important;
      left: 50% !important;
      transform: translateX(-50%) translateY(4px) !important;
      background: #059669 !important;
      color: #FFFFFF !important;
      font-size: 12px !important;
      font-weight: 600 !important;
      line-height: 1 !important;
      padding: 5px 11px !important;
      border-radius: 9999px !important;
      white-space: nowrap !important;
      opacity: 0 !important;
      visibility: hidden !important;
      pointer-events: none !important;
      z-index: 100000 !important;
      box-shadow: 0 4px 14px rgba(5, 150, 105, 0.4) !important;
      align-items: center !important;
      justify-content: center !important;
    }
    .top-copied-badge::after {
      content: '' !important;
      position: absolute !important;
      bottom: 100% !important;
      left: 50% !important;
      transform: translateX(-50%) !important;
      width: 0 !important;
      height: 0 !important;
      border-left: 5px solid transparent !important;
      border-right: 5px solid transparent !important;
      border-bottom: 5px solid #059669 !important;
    }
    .top-mail-wrap.copied .top-copied-badge {
      display: inline-flex !important;
      opacity: 1 !important;
      visibility: visible !important;
      transform: translateX(-50%) translateY(0) !important;
      animation: copiedBadgeFadeIn 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards !important;
    }
    @keyframes copiedBadgeFadeIn {
      from {
        opacity: 0;
        transform: translateX(-50%) translateY(4px);
      }
      to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
      }
    }
    .top-contact-link:hover {
      color: #FFFFFF !important;
    }
    .top-contact-text {
      font-family: inherit !important;
      font-size: inherit !important;
      font-weight: inherit !important;
      white-space: nowrap !important;
      display: inline-block !important;
      line-height: 1 !important;
    }
    .top-icon-circle {
      display: inline-flex !important;
      align-items: center !important;
      justify-content: center !important;
      color: #38BDF8 !important; /* Brand cyan-blue accent */
      flex-shrink: 0 !important;
      width: 14px !important;
      height: 14px !important;
      min-width: 14px !important;
      min-height: 14px !important;
    }
    .top-icon-wa {
      color: #25D366 !important; /* Official WhatsApp green */
    }
    .top-icon-mail {
      color: #38BDF8 !important;
    }
    .top-lang-selector {
      position: relative !important;
      display: inline-flex !important;
      align-items: center !important;
      flex-shrink: 0 !important;
      width: 108px !important;
      min-width: 108px !important;
      max-width: 108px !important;
      box-sizing: border-box !important;
    }
    .top-lang-btn {
      display: inline-flex !important;
      align-items: center !important;
      justify-content: flex-start !important;
      gap: 6px !important;
      width: 108px !important;
      min-width: 108px !important;
      max-width: 108px !important;
      height: 28px !important;
      min-height: 28px !important;
      max-height: 28px !important;
      padding: 0 8px !important;
      background: rgba(255, 255, 255, 0.06) !important;
      border: 1px solid rgba(255, 255, 255, 0.12) !important;
      border-radius: 6px !important;
      cursor: pointer !important;
      color: #E2E8F0 !important;
      transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease !important;
      font-family: var(--font-body, 'Inter', -apple-system, BlinkMacSystemFont, sans-serif) !important;
      font-size: 12px !important;
      font-weight: 500 !important;
      line-height: 1 !important;
      white-space: nowrap !important;
      flex-shrink: 0 !important;
      box-sizing: border-box !important;
    }
    .top-lang-btn:hover,
    .top-lang-selector.active .top-lang-btn {
      background: rgba(255, 255, 255, 0.14) !important;
      border-color: rgba(255, 255, 255, 0.25) !important;
      color: #FFFFFF !important;
    }
    .top-lang-btn .lang-flag-current {
      width: 20px !important;
      height: 14px !important;
      min-width: 20px !important;
      min-height: 14px !important;
      max-width: 20px !important;
      max-height: 14px !important;
      aspect-ratio: 20 / 14 !important;
      border-radius: 2px !important;
      box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.12) !important;
      object-fit: cover !important;
      flex-shrink: 0 !important;
      display: inline-block !important;
      margin: 0 !important;
      padding: 0 !important;
    }
    .top-lang-label {
      font-family: var(--font-body, 'Inter', -apple-system, BlinkMacSystemFont, sans-serif) !important;
      font-size: 12px !important;
      font-weight: 500 !important;
      color: inherit !important;
      letter-spacing: -0.01em !important;
      white-space: nowrap !important;
      line-height: 1 !important;
      display: inline-block !important;
      flex-shrink: 0 !important;
      overflow: hidden !important;
      text-overflow: ellipsis !important;
      width: 52px !important;
      min-width: 52px !important;
      max-width: 52px !important;
      text-align: center !important;
      margin: 0 !important;
      padding: 0 !important;
    }
    .top-lang-selector .lang-arrow {
      color: #94A3B8 !important;
      width: 11px !important;
      height: 11px !important;
      min-width: 11px !important;
      min-height: 11px !important;
      flex-shrink: 0 !important;
      display: inline-block !important;
      margin: 0 0 0 auto !important;
    }
    .top-lang-drop-menu {
      top: calc(100% + 6px) !important;
      right: 0 !important;
      left: auto !important;
    }

    /* 2. MAIN NAV BAR */
    .main-nav-bar {
      width: 100% !important;
      height: var(--header-navbar-height, 88px) !important;
      min-height: var(--header-navbar-height, 88px) !important;
      max-height: var(--header-navbar-height, 88px) !important;
      background: rgba(255, 255, 255, 0.98) !important;
      backdrop-filter: blur(16px) !important;
      -webkit-backdrop-filter: blur(16px) !important;
      border-bottom: 1px solid #E2E8F0 !important;
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.04) !important;
      box-sizing: border-box !important;
      display: flex !important;
      align-items: center !important;
    }
    .nav-bar-container {
      max-width: 1200px !important;
      width: 100% !important;
      margin: 0 auto !important;
      padding: 0 1.5rem !important;
      box-sizing: border-box !important;
      height: 100% !important;
      display: flex !important;
      justify-content: space-between !important;
      align-items: center !important;
      gap: 1.5rem !important;
    }

    /* Brand Logo */
    .brand-logo {
      display: inline-flex !important;
      align-items: center !important;
      gap: 0.85rem !important;
      text-decoration: none !important;
      flex-shrink: 0 !important;
      white-space: nowrap !important;
    }
    .brand-logo-img {
      display: block !important;
      height: 38px !important;
      width: auto !important;
      max-width: 240px !important;
      object-fit: contain !important;
    }

    /* Desktop Navigation Links */
    .nav-links {
      display: flex !important;
      align-items: center !important;
      gap: 2.25rem !important;
      flex-wrap: nowrap !important;
      white-space: nowrap !important;
      flex-shrink: 0 !important;
      list-style: none !important;
      margin: 0 !important;
      padding: 0 !important;
    }
    .nav-item {
      color: #1E293B !important;
      text-decoration: none !important;
      font-family: var(--font-body, 'Inter', -apple-system, BlinkMacSystemFont, sans-serif) !important;
      font-size: 0.95rem !important;
      font-weight: 500 !important;
      padding: 0.5rem 0 !important;
      position: relative !important;
      display: inline-block !important;
      transition: color 0.2s ease !important;
      line-height: 1.5 !important;
      white-space: nowrap !important;
    }
    .nav-item::after {
      content: "" !important;
      position: absolute !important;
      bottom: 0 !important;
      left: 0 !important;
      width: 0% !important;
      height: 2.5px !important;
      background: #0284C7 !important;
      border-radius: 2px !important;
      transition: width 0.2s cubic-bezier(0.16, 1, 0.3, 1) !important;
    }
    .nav-item:hover::after,
    .nav-item.active::after {
      width: 100% !important;
    }
    .nav-item:hover,
    .nav-item.active {
      color: #0284C7 !important;
    }

    /* 3. HEADER ACTIONS & MOBILE NAV CONTROLS */
    .header-actions {
      display: flex !important;
      align-items: center !important;
      gap: 8px !important;
      position: relative !important;
    }

    /* Mobile Language Selector in White Nav Bar (Default hidden on desktop) */
    .mobile-lang-selector {
      position: relative !important;
      display: none !important;
      align-items: center !important;
    }
    .mobile-lang-btn {
      display: inline-flex !important;
      align-items: center !important;
      gap: 6px !important;
      height: 38px !important;
      min-height: 38px !important;
      padding: 0 10px 0 8px !important;
      background: #F8FAFC !important;
      border: 1px solid #E2E8F0 !important;
      border-radius: 8px !important;
      cursor: pointer !important;
      color: #1E293B !important;
      font-family: inherit !important;
      font-size: 12.5px !important;
      font-weight: 500 !important;
      transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1) !important;
      box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04) !important;
      -webkit-tap-highlight-color: transparent !important;
      box-sizing: border-box !important;
    }
    .mobile-lang-btn:hover,
    .mobile-lang-btn:active,
    .mobile-lang-selector.active .mobile-lang-btn {
      background: #F0F9FF !important;
      border-color: #0284C7 !important;
      color: #0284C7 !important;
      box-shadow: 0 0 0 2px rgba(2, 132, 199, 0.12) !important;
    }
    .mobile-lang-btn .lang-flag-current {
      width: 20px !important;
      height: 14px !important;
      border-radius: 2px !important;
      box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.12) !important;
      object-fit: cover !important;
      flex-shrink: 0 !important;
      display: inline-block !important;
    }
    .mobile-lang-label {
      font-size: 12px !important;
      font-weight: 500 !important;
      color: inherit !important;
      letter-spacing: -0.01em !important;
      white-space: nowrap !important;
      line-height: 1 !important;
    }
    .mobile-lang-btn .lang-arrow {
      color: #94A3B8 !important;
      transition: transform 0.2s ease !important;
      flex-shrink: 0 !important;
    }
    .mobile-lang-selector.active .mobile-lang-btn .lang-arrow {
      transform: rotate(180deg) !important;
      color: #0284C7 !important;
    }
    .mobile-lang-drop-menu {
      display: none !important;
      position: absolute !important;
      top: calc(100% + 8px) !important;
      right: 0 !important;
      left: auto !important;
      min-width: 190px !important;
      max-width: 260px !important;
      max-height: min(420px, calc(100vh - 84px)) !important;
      overflow-y: auto !important;
      -webkit-overflow-scrolling: touch !important;
      background: #FFFFFF !important;
      border: 1px solid #E2E8F0 !important;
      border-radius: 12px !important;
      box-shadow: 0 12px 30px -4px rgba(15, 23, 42, 0.16), 0 4px 10px -2px rgba(15, 23, 42, 0.08) !important;
      padding: 6px 0 !important;
      z-index: 100005 !important;
      scrollbar-width: thin !important;
      scrollbar-color: #CBD5E1 transparent !important;
    }
    .mobile-lang-selector.active .mobile-lang-drop-menu,
    .mobile-lang-selector.open .mobile-lang-drop-menu {
      display: block !important;
      animation: mobileLangDropFadeIn 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards !important;
    }
    @keyframes mobileLangDropFadeIn {
      from {
        opacity: 0;
        transform: translateY(6px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
    .mobile-lang-drop-menu::-webkit-scrollbar {
      width: 4px !important;
    }
    .mobile-lang-drop-menu::-webkit-scrollbar-thumb {
      background: #CBD5E1 !important;
      border-radius: 4px !important;
    }

    /* Hamburger Menu Button */
    .mobile-menu-btn {
      display: none !important;
      width: 38px !important;
      height: 38px !important;
      min-width: 38px !important;
      min-height: 38px !important;
      padding: 0 !important;
      background: #FFFFFF !important;
      border: 1px solid #E2E8F0 !important;
      border-radius: 8px !important;
      cursor: pointer !important;
      flex-direction: column !important;
      justify-content: center !important;
      align-items: center !important;
      gap: 5px !important;
      transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1) !important;
      box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04) !important;
      -webkit-tap-highlight-color: transparent !important;
      box-sizing: border-box !important;
    }
    .mobile-menu-btn:hover,
    .mobile-menu-btn:active {
      background: #F8FAFC !important;
      border-color: #CBD5E1 !important;
    }
    .hamburger-line {
      display: block !important;
      width: 18px !important;
      height: 2px !important;
      background: #1E293B !important;
      border-radius: 2px !important;
      transition: transform 0.25s ease, opacity 0.2s ease !important;
    }

    /* Responsive Breakpoints */
    @media (max-width: 900px) {
      .top-contact-link.top-mail,
      .top-mail-wrap {
        display: none !important;
      }
    }
    @media (max-width: 768px) {
      :root {
        --header-topbar-height: 0px !important;
        --header-navbar-height: 64px !important;
        --header-height: 64px !important;
      }
      body {
        padding-top: var(--header-height, 64px) !important;
      }
      /* 手机端彻底去掉顶部黑色导航栏 */
      .top-contact-bar {
        display: none !important;
        height: 0 !important;
        min-height: 0 !important;
        max-height: 0 !important;
        padding: 0 !important;
        margin: 0 !important;
        border: none !important;
      }
      /* 白色主导航栏贴顶并消除双重空白 bug */
      .main-header {
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        right: 0 !important;
        width: 100% !important;
        height: var(--header-height, 64px) !important;
        min-height: var(--header-height, 64px) !important;
        max-height: var(--header-height, 64px) !important;
        padding: 0 !important;
        margin: 0 !important;
        background: #FFFFFF !important;
        border-bottom: 1px solid #E2E8F0 !important;
        box-shadow: 0 2px 10px rgba(15, 23, 42, 0.05) !important;
        display: flex !important;
        flex-direction: column !important;
        justify-content: center !important;
      }
      .main-nav-bar {
        height: 100% !important;
        min-height: 100% !important;
        max-height: 100% !important;
        display: flex !important;
        align-items: center !important;
        width: 100% !important;
        border-bottom: none !important;
        box-shadow: none !important;
        padding: 0 !important;
        margin: 0 !important;
      }
      .main-nav-bar .container {
        height: 100% !important;
        display: flex !important;
        align-items: center !important;
        justify-content: space-between !important;
        padding-left: 1rem !important;
        padding-right: 1rem !important;
        gap: 0.75rem !important;
      }

    @media (display-mode: standalone) and (max-width: 768px) {
      :root {
        --header-height: calc(64px + env(safe-area-inset-top, 0px)) !important;
      }
      body {
        padding-top: var(--header-height, 64px) !important;
      }
      .main-header {
        height: var(--header-height, 64px) !important;
        min-height: var(--header-height, 64px) !important;
        max-height: var(--header-height, 64px) !important;
        padding-top: env(safe-area-inset-top, 0px) !important;
      }
    }
      .brand-logo-img {
        height: 26px !important;
        max-width: 150px !important;
      }
      /* 手机端展示语言切换和三横汉堡按钮 */
      .mobile-lang-selector {
        display: inline-flex !important;
      }
      .mobile-menu-btn {
        display: inline-flex !important;
      }
      .desktop-only {
        display: none !important;
      }
      .mobile-only {
        display: inline-flex !important;
      }
    }

    /* 超窄屏防御：屏幕过小时收缩文字，确保零横向溢出 */
    @media (max-width: 370px) {
      .mobile-lang-label {
        display: none !important;
      }
      .mobile-lang-btn {
        padding: 0 6px !important;
        gap: 4px !important;
      }
      .main-nav-bar .container {
        padding-left: 0.75rem !important;
        padding-right: 0.75rem !important;
      }
    }

    @media (min-width: 769px) {
      .mobile-only {
        display: none !important;
      }
    }

    /* Lang Dropdown Styles */
    .lang-drop-menu {
      display: none !important;
      position: absolute !important;
      top: calc(100% + 8px) !important;
      right: 0 !important;
      left: auto !important;
      min-width: 200px !important;
      width: max-content !important;
      max-width: 280px !important;
      direction: ltr !important;
      text-align: left !important;
      max-height: none !important;
      overflow: visible !important;
      background: #FFFFFF !important;
      border: 1px solid #E2E8F0 !important;
      border-radius: 8px !important;
      box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.12), 0 8px 10px -6px rgba(15, 23, 42, 0.08) !important;
      padding: 6px 0 !important;
      z-index: 100005 !important;
      visibility: hidden !important;
      opacity: 0 !important;
      transform: translateY(6px) !important;
      pointer-events: none !important;
    }
    .lang-drop-arrow {
      display: block !important;
      position: absolute !important;
      top: -5px !important;
      right: 24px !important;
      width: 10px !important;
      height: 10px !important;
      background: #FFFFFF !important;
      border-top: 1px solid #E2E8F0 !important;
      border-left: 1px solid #E2E8F0 !important;
      transform: rotate(45deg) !important;
      pointer-events: none !important;
    }
    .lang-currency-selector.active .lang-drop-menu,
    .lang-currency-selector.open .lang-drop-menu {
      display: block !important;
      visibility: visible !important;
      opacity: 1 !important;
      transform: translateY(0) !important;
      pointer-events: auto !important;
      animation: langDropMenuFadeIn 0.2s cubic-bezier(0.16, 1, 0.3, 1) forwards !important;
    }
    @keyframes langDropMenuFadeIn {
      from {
        opacity: 0;
        transform: translateY(6px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
    .lang-drop-list {
      list-style: none !important;
      margin: 0 !important;
      padding: 0 !important;
    }
    .lang-drop-item {
      width: 100% !important;
      margin: 0 !important;
      padding: 0 !important;
    }
    .lang-drop-btn {
      display: flex !important;
      align-items: center !important;
      width: 100% !important;
      padding: 7px 16px !important;
      background: transparent !important;
      border: none !important;
      font-family: inherit !important;
      font-size: 13px !important;
      font-weight: 500 !important;
      color: #334155 !important;
      text-decoration: none !important;
      cursor: pointer !important;
      box-sizing: border-box !important;
      transition: background 0.15s ease, color 0.15s ease !important;
      text-align: left !important;
      line-height: 1.4 !important;
      -webkit-tap-highlight-color: transparent !important;
      direction: ltr !important;
      gap: 10px !important;
    }
    .lang-drop-btn:hover {
      background: #F1F5F9 !important;
      color: #0284C7 !important;
    }
    .lang-drop-item.active .lang-drop-btn {
      background: #F0F9FF !important;
      color: #0284C7 !important;
      font-weight: 600 !important;
    }
    .lang-flag-icon {
      width: 22px !important;
      height: 15px !important;
      border-radius: 2px !important;
      object-fit: cover !important;
      box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.12) !important;
      display: inline-block !important;
      vertical-align: middle !important;
      flex-shrink: 0 !important;
      margin: 0 !important;
    }
    .lang-drop-text {
      flex: 1 1 auto !important;
      white-space: nowrap !important;
      overflow: visible !important;
      text-overflow: clip !important;
    }
    .lang-drop-check {
      font-size: 12px !important;
      color: #0284C7 !important;
      margin-left: 10px !important;
      font-weight: 700 !important;
      flex-shrink: 0 !important;
    }
    [dir="rtl"] .lang-drop-menu {
      right: 0 !important;
      left: auto !important;
    }
    [dir="rtl"] .lang-drop-arrow {
      right: 24px !important;
      left: auto !important;
    }
    [dir="rtl"] .lang-drop-btn {
      text-align: left !important;
      direction: ltr !important;
    }
    [dir="rtl"] .lang-flag-icon {
      margin: 0 !important;
    }
    [dir="rtl"] .lang-drop-check {
      margin-left: 10px !important;
      margin-right: 0 !important;
    }