/* 基础重置与字体 */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --esc-white: #ffffff;
      --esc-white-light: #fbfbfd;
      --esc-white-medium: #f5f5f7;
      --esc-gray-extra-light: #f2f2f7;
      --esc-gray-light: #e5e5ea;
      --esc-gray: #c7c7cc;
      --esc-gray-medium: #8e8e93;
      --esc-gray-dark: #48484a;
      --esc-black-light: #3a3a3c;
      --esc-black: #1d1d1f;
      /* 极少使用 */
      --esc-blue: #007AFF;
      /* 极少使用，仅作为细微点缀 */
      --esc-gold: #d4af37;
      /* 苹果风格的金色 */
      --esc-space-black: #000000;
      --spacing-xs: 8px;
      --spacing-sm: 16px;
      --spacing-md: 32px;
      --spacing-lg: 64px;
      --spacing-xl: 96px;
      --border-radius: 12px;
      --border-radius-lg: 24px;
    }

    html {
      scroll-behavior: smooth;
      font-size: 62.5%;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", Arial, sans-serif;
      line-height: 1.5;
      color: var(--esc-gray-dark);
      background-color: var(--esc-white);
      overflow-x: hidden;
    }

    /* 排版 */
    h1,
    h2,
    h3,
    h4,
    h5 {
      font-weight: 600;
      letter-spacing: -0.02em;
      line-height: 1.1;
    }

    h1 {
      font-size: 5.6rem;
      color: var(--esc-black-light);
    }

    h2 {
      font-size: 4.8rem;
      margin-bottom: var(--spacing-md);
      color: var(--esc-black-light);
    }

    h3 {
      font-size: 3.2rem;
      margin-bottom: var(--spacing-sm);
      color: var(--esc-black-light);
    }

    h4 {
      font-size: 2.4rem;
      margin-bottom: var(--spacing-sm);
      color: var(--esc-black-light);
    }

    h5 {
      font-size: 1.8rem;
      margin-bottom: var(--spacing-xs);
      color: var(--esc-gray-dark);
    }

    p {
      /* font-size: 1.7rem; */
      line-height: 1.6;
      color: var(--esc-gray-medium);
    }

    .lead {
      font-size: 2.4rem;
      line-height: 1.4;
      color: var(--esc-gray-dark);
    }

    .caption {
      font-size: 1.4rem;
      color: var(--esc-gray-medium);
      text-transform: uppercase;
      letter-spacing: 0.1em;
      margin-bottom: var(--spacing-sm);
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      padding: var(--spacing-sm) var(--spacing-md);
      display: flex;
      justify-content: space-between;
      align-items: center;
      z-index: 1000;
      backdrop-filter: blur(20px) saturate(180%);
      -webkit-backdrop-filter: blur(20px) saturate(180%);
      background-color: rgba(255, 255, 255, 0.92);
      border-bottom: 1px solid rgba(0, 0, 0, 0.02);
      transition: all 0.3s ease;
    }

    .navbar.scrolled {
      background-color: rgba(255, 255, 255, 0.98);
      padding: var(--spacing-xs) var(--spacing-md);
    }
    .logo {
      display: flex;
      align-items: center;
      gap: var(--spacing-xs);
      text-decoration: none;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      border-radius: 8px;
      background: linear-gradient(135deg, var(--esc-gold) 0%, #f9e076 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--esc-white);
      font-weight: bold;
      font-size: 1.8rem;
    }

    .logo-text {
      font-size: 2.1rem;
      font-weight: 600;
      letter-spacing: -0.02em;
      color: var(--esc-gray-dark);
    }

    .nav-links {
      display: flex;
      gap: var(--spacing-md);
      position: relative;
    }

    .nav-link {
      font-size: 1.2rem;
      font-weight: 400;
      color: var(--esc-gray-medium);
      text-decoration: none;
      transition: all 0.3s ease;
      position: relative;
      display: flex;
      align-items: center;
    }

    .nav-link:hover {
      color: var(--esc-black-light);
    }

    .nav-link.active {
      color: var(--esc-black-light);
    }

    /* 下拉菜单样式 - 苹果风格 */
    .dropdown {
      position: relative;
      display: inline-block;
    }

    .dropdown-content {
      display: none;
      position: absolute;
      background-color: var(--esc-white);
      min-width: 240px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
      z-index: 1000;
      border-radius: 8px;
      top: calc(100% + 10px);
      left: 0;
      overflow: hidden;
      opacity: 0;
      visibility: hidden;
      transform: translateY(-10px);
      transition: all 0.3s ease;
      padding: 16px 0;
    }

    .dropdown-content.show {
      display: block;
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }

    .dropdown-content .nav-link {
      padding: 8px 24px;
      display: block;
      width: 100%;
      font-size: 1.2rem;
      color: var(--esc-gray-dark);
    }

    .dropdown-content .nav-link:hover {
      background-color: var(--esc-white-medium);
      color: var(--esc-black);
    }

    /* 三级菜单样式 */
    .sub-dropdown {
      position: relative;
    }

    .sub-dropdown-content {
      display: none;
      position: absolute;
      background-color: var(--esc-white);
      min-width: 200px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
      z-index: 1001;
      border-radius: 8px;
      top: -8px;
      left: calc(100% - 8px);
      overflow: hidden;
      opacity: 0;
      visibility: hidden;
      transform: translateX(-10px);
      transition: all 0.3s ease;
      padding: 16px 0;
    }

    /* 苹果风格的PC端悬停显示 */
    .dropdown:hover .dropdown-content {
      display: block;
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }

    .sub-dropdown:hover .sub-dropdown-content {
      display: block;
      opacity: 1;
      visibility: visible;
      transform: translateX(0);
    }

    .sub-dropdown-content.show {
      display: block !important;
      opacity: 1;
      visibility: visible;
      transform: translateX(0);
    }

    .sub-dropdown-content .nav-link {
      padding: 8px 24px;
      display: block;
      width: 100%;
      font-size: 1.2rem;
    }

    .sub-dropdown-content .nav-link:hover {
      background-color: var(--esc-white-medium);
    }

    .nav-actions {
      display: flex;
      gap: var(--spacing-sm);
      flex-shrink: 0;
    }

    .btn-nav {
      padding: 0.8rem 1.6rem;
      font-size: 1.4rem;
      font-weight: 500;
      border-radius: 20px;
      border: 1px solid rgba(0, 0, 0, 0.05);
      background: rgba(0, 0, 0, 0.02);
      color: var(--esc-gray-dark);
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .btn-nav:hover {
      background: rgba(0, 0, 0, 0.04);
      border-color: rgba(0, 0, 0, 0.08);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: var(--esc-gray-dark);
      font-size: 2.4rem;
      cursor: pointer;
    }

    /* 苹果风格的移动端菜单 */
    .dropdown-content.apple-style {
      width: auto;
      min-width: 980px;
      max-width: calc(100vw - 40px);
      left: 50%;
      transform: translate(-50%, 5px);
      border-radius: 0 0 18px 18px;
      padding: 20px 0 10px;
      box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
      background: #f5f5f7;
      top: 100%;
      font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
      border: 1px solid rgba(0, 0, 0, 0.08);
    }

    .dropdown-row {
      display: flex;
      padding: 0 20px;
    }

    .dropdown-col {
      flex: 1;
      padding: 12px 20px;
      min-width: 200px;
    }

    .dropdown-col.full-width {
      flex: none;
      width: 100%;
      padding: 20px 40px;
    }

    .dropdown-col h4 {
      margin: 0 0 12px 0;
      font-size: 1.15rem;
      font-weight: 600;
      color: #1d1d1f;
      display: flex;
      align-items: center;
      text-transform: uppercase;
      letter-spacing: 0.03em;
      color: #8d8d8f;
      font-weight: 400;
    }

    .dropdown-col .nav-link {
      display: block;
      width: 100%;
      font-size: 1.15rem;
      color: #1d1d1f;
      padding: 7px 0;
      margin: 0;
      border-radius: 0;
      transition: color 0.15s ease;
      font-weight: 400;
      letter-spacing: -0.01em;
      font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
    }

    .dropdown-col .nav-link:hover {
      background-color: transparent;
      color: #0071e3;
    }

    .dropdown-col.featured {
      border-left: 1px solid #d2d2d7;
      position: relative;
    }

    .featured-card {
      background: linear-gradient(135deg, #ffffff, #f8f8f9);
      padding: 24px;
      border-radius: 12px;
      height: 100%;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    }

    .featured-card h4 {
      font-size: 1.15rem;
      margin: 0 0 12px 0;
      color: #1d1d1f;
      text-transform: uppercase;
      letter-spacing: 0.03em;
      color: #8d8d8f;
      font-weight: 400;
    }

    .featured-card p {
      font-size: 1.15rem;
      color: #6e6e73;
      margin: 5px 0;
      line-height: 1.5;
    }

    .product-showcase {
      display: flex;
      gap: 30px;
      margin-top: 15px;
      justify-content: space-around;
    }

    .product-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      text-align: center;
      flex: 1;
    }

    .product-item img {
      border-radius: 12px;
      width: 80px;
      height: 80px;
      object-fit: cover;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    }

    .product-item h5 {
      font-size: 1.15rem;
      margin: 8px 0 4px 0;
      color: #1d1d1f;
      font-weight: 500;
      letter-spacing: -0.01em;
    }

    .product-item p {
      font-size: 1.1rem;
      margin: 0;
      color: #6e6e73;
      line-height: 1.4;
    }

    .dropdown-col.showcase {
      padding: 0 40px;
    }

    .dropdown-col.showcase h3 {
      font-size: 1.2rem;
      margin: 0 0 20px 0;
      color: #1d1d1f;
      text-align: center;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: #8d8d8f;
      font-weight: 400;
    }

    .dropdown-content.apple-style.show {
      display: block;
      opacity: 1;
      visibility: visible;
      transform: translate(-50%, 0);
    }

    /* 移动端适配 */
    @media (max-width: 768px) {
      .dropdown-content.apple-style {
        position: static;
        width: 100%;
        min-width: unset;
        max-width: unset;
        margin-top: 10px;
        transform: none;
        border-radius: 12px;
      }

      .dropdown-row {
        flex-direction: column;
      }

      .dropdown-col {
        padding: 12px 20px;
      }

      .dropdown-col.full-width {
        padding: 20px;
      }

      .product-showcase {
        flex-direction: column;
      }
    }



    .dropdown-content.show-mobile {
      display: block;
      max-height: 70vh;
      padding: 16px 0;
      overflow-y: auto;
    }

    /* 移动端三级菜单样式 */
    .sub-dropdown-content {
      position: static;
      box-shadow: none;
      background-color: var(--esc-gray-light);
      padding-left: 30px;
      display: none;
      opacity: 1;
      visibility: visible;
      transform: none;
      border-radius: 0;
      width: 100%;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
    }

    .sub-dropdown-content.show-mobile {
      display: block;
      max-height: 60vh;
      padding: 16px 0;
      overflow-y: auto;
      margin-left: -30px;
      padding-left: 30px;
    }

    .mobile-menu-btn {
      display: block;
    }

    .hero-section {
      padding: calc(var(--spacing-xl) + 80px) var(--spacing-md) var(--spacing-xl);
    }


    /* 主要内容区域 */
    .main-content {
      margin-top: 80px;
    }

    /* 英雄区域 */
    .hero-section {
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
      padding: var(--spacing-xl) var(--spacing-md);
      position: relative;
      overflow: hidden;
      background-color: var(--esc-white-light);
    }

    .hero-grid {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 0;
      opacity: 0.03;
      background-image:
        linear-gradient(rgba(0, 0, 0, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 0, 0, 0.05) 1px, transparent 1px);
      background-size: 50px 50px;
    }

    .hero-title {
      margin-bottom: var(--spacing-md);
      max-width: 900px;
      position: relative;
      z-index: 1;
    }

    .hero-subtitle {
      max-width: 700px;
      margin-bottom: var(--spacing-lg);
      position: relative;
      z-index: 1;
    }

    /* 分区样式 */
    .section {
      padding: var(--spacing-xl) var(--spacing-md);
      position: relative;
    }

    .section-header {
      text-align: center;
      margin-bottom: var(--spacing-xl);
    }

    .section-light {
      background-color: var(--esc-white-light);
    }

    .section-white {
      background-color: var(--esc-white);
    }

    /* 卡片设计 */
    .card {
      background: var(--esc-white);
      border-radius: var(--border-radius-lg);
      padding: var(--spacing-lg);
      border: 1px solid rgba(0, 0, 0, 0.03);
      transition: all 0.5s ease;
      height: 100%;
      position: relative;
      overflow: hidden;
      box-shadow: 0 5px 20px rgba(0, 0, 0, 0.02);
    }

    .card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(0, 0, 0, 0.005) 0%, rgba(0, 0, 0, 0) 100%);
      z-index: 0;
    }

    .card:hover {
      transform: translateY(-10px);
      border-color: rgba(0, 0, 0, 0.05);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.03);
    }

    .card-icon {
      width: 70px;
      height: 70px;
      margin-bottom: var(--spacing-md);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2.8rem;
      background: rgba(0, 0, 0, 0.02);
      color: var(--esc-gray-dark);
      border: 1px solid rgba(0, 0, 0, 0.03);
      position: relative;
      z-index: 1;
    }

    /* 网格布局 */
    .grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: var(--spacing-lg);
      max-width: 1200px;
      margin: 0 auto;
    }

    .grid-2 {
      grid-template-columns: repeat(2, 1fr);
    }

    .grid-3 {
      grid-template-columns: repeat(3, 1fr);
    }

    /* 核心价值部分 */
    .core-values {
      display: flex;
      flex-direction: column;
      gap: var(--spacing-lg);
      max-width: 1200px;
      margin: 0 auto;
    }

    .value-item {
      display: flex;
      align-items: flex-start;
      gap: var(--spacing-md);
      padding: var(--spacing-md);
      border-radius: var(--border-radius);
      background: rgba(0, 0, 0, 0.005);
      transition: all 0.3s ease;
      border: 1px solid transparent;
    }

    .value-item:hover {
      background: rgba(0, 0, 0, 0.01);
      border-color: rgba(0, 0, 0, 0.03);
    }

    .value-icon {
      width: 50px;
      height: 50px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      background: rgba(0, 0, 0, 0.02);
      color: var(--esc-gray-dark);
      border: 1px solid rgba(0, 0, 0, 0.03);
      flex-shrink: 0;
    }

    /* 时间线样式 */
    .timeline {
      position: relative;
      max-width: 800px;
      margin: 0 auto;
    }

    .timeline::after {
      content: '';
      position: absolute;
      width: 1px;
      background: linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.05), transparent);
      top: 0;
      bottom: 0;
      left: 50%;
      margin-left: -0.5px;
    }

    .timeline-item {
      padding: var(--spacing-md);
      position: relative;
      width: 50%;
      box-sizing: border-box;
      margin-bottom: var(--spacing-lg);
    }

    .timeline-item:nth-child(odd) {
      left: 0;
      padding-right: 50px;
    }

    .timeline-item:nth-child(even) {
      left: 50%;
      padding-left: 50px;
    }

    .timeline-content {
      padding: var(--spacing-md);
      background: var(--esc-white);
      border-radius: var(--border-radius);
      border: 1px solid rgba(0, 0, 0, 0.03);
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.01);
    }

    .timeline-year {
      position: absolute;
      top: 0;
      width: 100px;
      height: 40px;
      line-height: 40px;
      text-align: center;
      border-radius: 20px;
      background: rgba(0, 0, 0, 0.03);
      color: var(--esc-gray-dark);
      font-weight: 600;
      z-index: 1;
      border: 1px solid rgba(0, 0, 0, 0.05);
    }

    .timeline-item:nth-child(odd) .timeline-year {
      right: -50px;
    }

    .timeline-item:nth-child(even) .timeline-year {
      left: -50px;
    }

    /* 交互式数据展示 */
    .stats-container {
      display: flex;
      justify-content: center;
      gap: var(--spacing-xl);
      flex-wrap: wrap;
      margin: var(--spacing-xl) 0;
    }

    .stat-item {
      text-align: center;
      min-width: 150px;
    }

    .stat-number {
      font-size: 4.8rem;
      font-weight: 700;
      color: var(--esc-black-light);
      margin-bottom: var(--spacing-xs);
      line-height: 1;
    }

    .stat-label {
      font-size: 1.4rem;
      color: var(--esc-gray-medium);
      text-transform: uppercase;
      letter-spacing: 0.1em;
    }

    /* 产品展示轮播 */
    .carousel-container {
      max-width: 1200px;
      margin: 0 auto;
      position: relative;
      overflow: hidden;
      border-radius: var(--border-radius-lg);
      background: var(--esc-white);
      border: 1px solid rgba(0, 0, 0, 0.03);
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.02);
    }

    .carousel {
      display: flex;
      transition: transform 0.5s ease;
    }

    .carousel-slide {
      min-width: 100%;
      padding: var(--spacing-xl);
      box-sizing: border-box;
      text-align: center;
      background: var(--esc-white);
    }

    .carousel-nav {
      position: absolute;
      top: 50%;
      transform: translateY(-50%);
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.95);
      border: 1px solid rgba(0, 0, 0, 0.05);
      color: var(--esc-gray-dark);
      font-size: 2rem;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: all 0.3s ease;
      z-index: 10;
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.03);
    }

    .carousel-nav:hover {
      background: rgba(255, 255, 255, 1);
      box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
      border-color: rgba(0, 0, 0, 0.08);
    }

    .carousel-prev {
      left: var(--spacing-md);
    }

    .carousel-next {
      right: var(--spacing-md);
    }

    .carousel-indicators {
      display: flex;
      justify-content: center;
      gap: var(--spacing-xs);
      margin-top: var(--spacing-md);
    }

    .carousel-indicator {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: rgba(0, 0, 0, 0.05);
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .carousel-indicator.active {
      background: var(--esc-gray-dark);
      transform: scale(1.2);
    }

    /* 页脚 */
    footer {
      background-color: #f5f5f7;
      /* 浅灰色背景 */
      padding: 40px 0 0;
      margin-top: var(--spacing-xl);
      color: var(--esc-gray-dark);
      /* 灰黑色字体 */
    }

    .footer-content {
      max-width: 1200px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: var(--spacing-lg);
      padding: 0 var(--spacing-md);
    }

    .footer-column {
      display: flex;
      flex-direction: column;
    }

    .footer-column h4 {
      font-size: 1.4rem;
      color: var(--esc-black);
      /* 更深的颜色 - 黑色 */
      margin-bottom: var(--spacing-sm);
      position: relative;
    }

    .footer-column ul {
      list-style: none;
      padding: 0;
    }

    .footer-column ul li {
      margin-bottom: var(--spacing-xs);
    }

    .footer-column ul li a {
      text-decoration: none;
      color: var(--esc-gray-dark);
      /* 更深的颜色 - 灰黑色 */
      font-size: 1.2rem;
      transition: all 0.3s ease;
      padding: 5px 0;
      display: block;
    }

    .footer-column ul li a:hover {
      color: var(--esc-black);
      /* 悬停时使用纯黑色 */
    }

    .footer-bottom {
      max-width: 1200px;
      margin: 40px auto 0;
      padding: 20px var(--spacing-md);
      border-top: 1px solid var(--esc-gray-light);
      /* 边框使用浅灰色 */
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 0.5rem;
    }

    .copyright p {
      font-size: 1.2rem;
      color: var(--esc-gray-dark);
      /* 版权信息也设为灰黑色 */
      margin: 0;
    }

    .footer-links {
      display: flex;
      gap: 1.5rem;
    }

    .footer-links a {
      text-decoration: none;
      color: var(--esc-gray-dark);
      /* 链接使用灰黑色 */
      font-size: 1.2rem;
      transition: all 0.3s ease;
      padding: 0.2rem 0.5rem;
    }

    .footer-links a:hover {
      color: var(--esc-black);
      /* 悬停时使用黑色 */
    }

    /* 本地化选择器样式 */
    .localization {
      display: flex;
      align-items: center;
      gap: 1rem;
      font-size: 1.2rem;
    }

    #country-selector,
    #language-selector {
      background: transparent;
      border: 1px solid var(--esc-gray-light);
      border-radius: 4px;
      padding: 0.5rem;
      color: var(--esc-gray-dark);
      font-size: 1.2rem;
      outline: none;
    }

    #location-indicator {
      font-size: 1.2rem;
      color: var(--esc-gray-dark);
    }

    /* 移动端特定样式 */
    @media (max-width: 768px) {
      .footer-content {
        grid-template-columns: 1fr;
        padding: 0 var(--spacing-md);
      }

      .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
      }

      .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        margin-bottom: var(--spacing-sm);
      }

      .footer-column h4 {
        padding: 10px 0;
        cursor: pointer;
        display: flex;
        justify-content: space-between;
        align-items: center;
      }

      .footer-column h4::after {
        content: '\f107';
        font-family: 'Font Awesome 6 Free';
        font-weight: 900;
        transition: transform 0.3s ease;
      }

      .footer-column h4.collapsed::after {
        content: '\f106';
      }

      .footer-column ul {
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
      }

      .footer-column ul.expanded {
        max-height: 300px;
      }
    }

    /* 按钮 */
    .btn {
      display: inline-block;
      padding: 1.4rem 3rem;
      font-size: 1.6rem;
      font-weight: 500;
      text-decoration: none;
      border-radius: 30px;
      transition: all 0.3s ease;
      cursor: pointer;
      border: none;
    }

    .btn-primary {
      background: rgba(0, 0, 0, 0.04);
      color: var(--esc-gray-dark);
      border: 1px solid rgba(0, 0, 0, 0.05);
    }

    .btn-primary:hover {
      background: rgba(0, 0, 0, 0.06);
      transform: scale(1.05);
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
      border-color: rgba(0, 0, 0, 0.08);
    }

    .btn-secondary {
      background: transparent;
      color: var(--esc-gray-dark);
      border: 1px solid rgba(0, 0, 0, 0.05);
    }

    .btn-secondary:hover {
      background: rgba(0, 0, 0, 0.02);
      border-color: rgba(0, 0, 0, 0.08);
    }

    /* 响应式设计 - 移动端适配 */
    @media (max-width: 768px) {
      h1 {
        font-size: 4rem;
      }

      h2 {
        font-size: 3.2rem;
      }

      h3 {
        font-size: 2.4rem;
      }

      .lead {
        font-size: 2rem;
      }

      .navbar {
        padding: var(--spacing-sm);
      }

      .nav-links {
        display: none;
      }

      .nav-links.show-mobile {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: var(--esc-white);
        flex-direction: column;
        align-items: center;
        justify-content: flex-start;
        padding-top: 80px;
        z-index: 2000;
        transform: translateY(-100%);
        transition: transform 0.4s ease;
      }

      .nav-links.show-mobile.show {
        transform: translateY(0);
      }

      .nav-link {
        margin: 8px 0;
        display: block;
        padding: 12px 20px;
        width: calc(100% - 40px);
        border-radius: var(--border-radius);
      }

      .nav-link:hover {
        background-color: var(--esc-white-medium);
      }

      .dropdown,
      .sub-dropdown {
        width: 100%;
        display: block;
      }

      .dropdown-content,
      .sub-dropdown-content {
        position: static;
        display: none;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
        min-width: 100%;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
        border-radius: 0;
      }

      .dropdown.active .dropdown-content {
        display: block;
        max-height: 500px;
        opacity: 1;
        visibility: visible;
        padding: 10px 0;
        border-radius: var(--border-radius);
      }

      .sub-dropdown.active .sub-dropdown-content {
        display: block;
        max-height: 400px;
        opacity: 1;
        visibility: visible;
        padding: 10px 0 10px 20px;
        border-radius: var(--border-radius);
      }

      .sub-dropdown-content {
        left: 20px;
        top: 100%;
        position: relative;
        min-width: calc(100% - 20px);
      }

      .sub-dropdown-content .nav-link {
        padding-left: 30px;
        background-color: rgba(0, 0, 0, 0.03);
      }

      .mobile-menu-btn {
        display: block;
      }
    }

    /* 移动端子菜单样式 */
    @media (max-width: 768px) {
      .sub-dropdown-content .nav-link {
        padding: 12px 20px 12px 40px !important;
        background-color: rgba(0, 0, 0, 0.03);
      }

      .dropdown-content .nav-link,
      .sub-dropdown-content .nav-link {
        width: calc(100% - 40px);
        margin: 4px 20px;
        border-radius: 4px;
      }

      .dropdown-content .nav-link:first-child,
      .sub-dropdown-content .nav-link:first-child {
        margin-top: 8px;
      }

      .dropdown-content .nav-link:last-child,
      .sub-dropdown-content .nav-link:last-child {
        margin-bottom: 8px;
      }
    }

    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 400px;
      height: 100vh;
      background: var(--esc-white);
      z-index: 10000;
      transition: right 0.3s ease;
      box-shadow: -5px 0 15px rgba(0, 0, 0, 0.05);
      overflow-y: auto;
    }

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

    .mobile-menu-header {
      padding: var(--spacing-lg) var(--spacing-md);
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid var(--esc-gray-light);
    }

    .mobile-menu-links {
      padding: var(--spacing-md);
    }

    .mobile-menu-link {
      display: block;
      padding: var(--spacing-sm) var(--spacing-md);
      text-decoration: none;
      color: var(--esc-gray-dark);
      font-size: 1.6rem;
      transition: all 0.2s ease;
      border-radius: var(--border-radius);
    }

    .mobile-menu-link:hover,
    .mobile-menu-link.active {
      background-color: var(--esc-white-medium);
      color: var(--esc-black-light);
    }

    .menu-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.5);
      z-index: 9999;
      opacity: 0;
      visibility: hidden;
      transition: all 0.3s ease;
    }

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

    /* 动画 */
    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(30px);
      }

      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .fade-in {
      opacity: 0;
      animation: fadeInUp 0.8s ease forwards;
    }

    @keyframes float {

      0%,
      100% {
        transform: translateY(0);
      }

      50% {
        transform: translateY(-10px);
      }
    }

    .float {
      animation: float 5s ease-in-out infinite;
    }

    /* 粒子效果 */
    .particles-container {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: -1;
    }

    /* 进度条 */
    .progress-container {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: transparent;
      z-index: 1002;
    }

    .progress-bar {
      height: 100%;
      background: rgba(0, 0, 0, 0.05);
      width: 0%;
      transition: width 0.3s ease;
    }

    /* 滚动提示 */
    .scroll-hint {
      position: absolute;
      bottom: var(--spacing-lg);
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--esc-gray);
      font-size: 1.2rem;
      text-transform: uppercase;
      letter-spacing: 0.2em;
    }

    .scroll-hint-icon {
      margin-top: var(--spacing-xs);
      font-size: 2rem;
      animation: bounce 2s infinite;
    }

    @keyframes bounce {

      0%,
      20%,
      50%,
      80%,
      100% {
        transform: translateY(0);
      }

      40% {
        transform: translateY(-10px);
      }

      60% {
        transform: translateY(-5px);
      }
    }

    /* 优雅的线条装饰 */
    .line-decoration {
      position: absolute;
      width: 100%;
      height: 1px;
      background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.03), transparent);
      z-index: 0;
    }

    /* 科技感网格背景 */
    .tech-grid {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: -1;
      opacity: 0.02;
      background-image:
        linear-gradient(90deg, rgba(0, 0, 0, 0.03) 1px, transparent 1px),
        linear-gradient(rgba(0, 0, 0, 0.03) 1px, transparent 1px);
      background-size: 30px 30px;
    }

    /* 超浅灰色分隔线 */
    .separator {
      width: 100%;
      height: 1px;
      background: rgba(0, 0, 0, 0.02);
      margin: var(--spacing-xl) 0;
    }

    .footer-section ul li a {

      transition: all 0.2s ease;
      color: var(--esc-gray-dark);
    }

    /* 苹果官网风格的底部导航 */
    .bottom-navigation {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      display: none;
      background: rgba(255, 255, 255, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-top: 1px solid var(--esc-gray-light);
      padding: 8px 0;
      z-index: 1000;
    }

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

    .nav-link-mobile {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-decoration: none;
      color: var(--esc-gray-medium);
      font-size: 1.0rem;
      transition: all 0.3s ease;
      padding: 4px 0;
    }

    .nav-link-mobile.active,
    .nav-link-mobile:hover {
      color: var(--esc-blue);
    }

    .nav-icon {
      font-size: 1.5rem;
      margin-bottom: 2px;
    }

    .nav-text {
      font-size: 0.8rem;
    }

    @media (max-width: 768px) {
      .bottom-navigation {
        display: flex;
      }

      .main-content {
        margin-bottom: 80px;
      }
    }

    /* 图片容器样式 */
    .image-footer {
      padding: var(--spacing-sm) var(--spacing-md);
      /* 减小上下padding，保持左右padding */
      text-align: center;
    }

    .image-container {
      display: flex;
      justify-content: center;
      align-items: center;
      flex-wrap: wrap;
      column-gap: var(--spacing-md);
      /* 只设置列间距，即左右间距 */
      row-gap: 0;
      /* 行间距设置为0，即上下无间距 */
    }

    .footer-img {
      max-height: 60px;
      width: auto;
      object-fit: contain;
      padding: 0 10px;
      /* 给每张图片左右额外的间距 */
    }