/* 多彩涂鸦风格 (Neo-Brutalism & Colorful Graffiti) */
    :root {
      --bg-color: #FAF8F5;
      --text-color: #1E1E1E;
      --primary: #FFE600; /* 明黄 */
      --secondary: #FF4B91; /* 玫红 */
      --accent: #00F0FF; /* 青蓝 */
      --accent-dark: #8B5CF6; /* 紫色 */
      --success: #10B981;
      --border-dark: #1E1E1E;
      --card-shadow: 6px 6px 0px #1E1E1E;
      --hover-shadow: 10px 10px 0px #1E1E1E;
      --container-width: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

    body {
      background-color: var(--bg-color);
      color: var(--text-color);
      line-height: 1.6;
      overflow-x: hidden;
      padding-top: 80px; /* 导航留空 */
    }

    a {
      text-decoration: none;
      color: var(--text-color);
    }

    /* 骨架居中容器 */
    .container {
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* 涂鸦风公共标题 */
    .section-title {
      font-size: 2.2rem;
      font-weight: 900;
      text-align: center;
      margin-bottom: 40px;
      position: relative;
      display: inline-block;
      left: 50%;
      transform: translateX(-50%);
      padding: 10px 20px;
      background: var(--accent);
      border: 3px solid var(--border-dark);
      box-shadow: 4px 4px 0px var(--border-dark);
      transform: translateX(-50%) rotate(-1deg);
    }
    
    .section-title::after {
      content: '';
      position: absolute;
      width: 100%;
      height: 100%;
      left: 5px;
      top: 5px;
      border: 2px dashed var(--secondary);
      z-index: -1;
      pointer-events: none;
    }

    /* 涂鸦风格通用卡片 */
    .doodle-card {
      background: #FFFFFF;
      border: 3px solid var(--border-dark);
      box-shadow: var(--card-shadow);
      border-radius: 16px;
      padding: 24px;
      transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    }

    .doodle-card:hover {
      transform: translate(-4px, -4px);
      box-shadow: var(--hover-shadow);
    }

    /* 涂鸦大按钮 */
    .doodle-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 28px;
      font-size: 1.1rem;
      font-weight: bold;
      background: var(--primary);
      border: 3px solid var(--border-dark);
      box-shadow: 4px 4px 0px var(--border-dark);
      border-radius: 8px;
      cursor: pointer;
      transition: all 0.2s ease;
      color: var(--text-color);
    }

    .doodle-btn:hover {
      transform: translate(-2px, -2px);
      box-shadow: 6px 6px 0px var(--border-dark);
      background: var(--secondary);
      color: #FFF;
    }

    .doodle-btn:active {
      transform: translate(2px, 2px);
      box-shadow: 2px 2px 0px var(--border-dark);
    }

    .doodle-btn-accent {
      background: var(--accent);
    }
    .doodle-btn-accent:hover {
      background: var(--accent-dark);
    }

    /* 导航栏 */
    header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 80px;
      background: #FFF;
      border-bottom: 4px solid var(--border-dark);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 100%;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .ai-page-logo {
      height: 48px;
      display: block;
      border: 2px solid var(--border-dark);
      border-radius: 6px;
      background: var(--primary);
    }

    .brand-name {
      font-size: 1.4rem;
      font-weight: 900;
      color: var(--text-color);
      letter-spacing: 1px;
    }

    .nav-menu {
      display: flex;
      gap: 20px;
      align-items: center;
    }

    .nav-item {
      font-weight: bold;
      padding: 8px 12px;
      border-radius: 6px;
      transition: all 0.2s;
      border: 2px solid transparent;
    }

    .nav-item:hover {
      background: var(--primary);
      border-color: var(--border-dark);
      transform: rotate(-1.5deg);
    }

    .mobile-menu-btn {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      cursor: pointer;
    }

    /* Hero 首屏 (无图) */
    .hero-section {
      background: radial-gradient(circle at 10% 20%, rgba(255, 230, 0, 0.15) 0%, rgba(0, 240, 255, 0.1) 90.1%);
      border-bottom: 4px solid var(--border-dark);
      padding: 100px 0 120px 0;
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-block;
      background: var(--secondary);
      color: white;
      font-weight: bold;
      padding: 6px 16px;
      border: 2px solid var(--border-dark);
      border-radius: 20px;
      box-shadow: 2px 2px 0px var(--border-dark);
      transform: rotate(2deg);
      margin-bottom: 24px;
    }

    h1.hero-title {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 24px;
      color: var(--text-color);
    }

    h1.hero-title span {
      background: linear-gradient(120deg, var(--secondary) 0%, var(--accent-dark) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      padding: 0 6px;
    }

    .hero-subtitle {
      font-size: 1.25rem;
      max-width: 800px;
      margin: 0 auto 40px auto;
      color: #4a4a4a;
    }

    .hero-buttons {
      display: flex;
      justify-content: center;
      gap: 20px;
      flex-wrap: wrap;
    }

    /* 数据指标卡片 */
    .stats-section {
      padding: 60px 0;
      background: #fff;
      border-bottom: 4px solid var(--border-dark);
    }

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

    .stat-card {
      text-align: center;
      background: #FAF8F5;
    }

    .stat-num {
      font-size: 2.5rem;
      font-weight: 900;
      color: var(--secondary);
      margin-bottom: 8px;
    }

    .stat-label {
      font-weight: bold;
      color: #666;
    }

    /* 关于我们 & 平台介绍 */
    .about-section {
      padding: 80px 0;
      border-bottom: 4px solid var(--border-dark);
    }

    .about-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: start;
    }

    .about-content h3 {
      font-size: 1.8rem;
      font-weight: 900;
      margin-bottom: 20px;
    }

    .about-desc {
      font-size: 1.1rem;
      color: #4a4a4a;
      margin-bottom: 30px;
    }

    .feature-list {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .feature-item {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: bold;
    }

    .feature-item::before {
      content: '✔';
      color: #FFF;
      background: var(--success);
      width: 24px;
      height: 24px;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: 2px solid var(--border-dark);
    }

    .about-side {
      background: var(--accent);
      transform: rotate(1deg);
    }

    .about-side h4 {
      font-size: 1.4rem;
      font-weight: 900;
      margin-bottom: 16px;
    }

    .about-side ul {
      list-style-type: none;
    }

    .about-side li {
      margin-bottom: 12px;
      font-weight: bold;
      padding-left: 20px;
      position: relative;
    }

    .about-side li::before {
      content: '★';
      position: absolute;
      left: 0;
      color: var(--secondary);
    }

    /* 全平台 AIGC 服务 */
    .services-section {
      padding: 80px 0;
      background: #FFF;
      border-bottom: 4px solid var(--border-dark);
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .service-card h3 {
      font-size: 1.4rem;
      font-weight: 900;
      margin-bottom: 12px;
      color: var(--text-color);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .service-card p {
      color: #555;
      margin-bottom: 16px;
    }

    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .model-tag {
      font-size: 0.8rem;
      padding: 4px 8px;
      background: #F3F4F6;
      border: 1px solid var(--border-dark);
      border-radius: 4px;
      font-weight: bold;
    }

    /* 一站式 AIGC 制作 + 标准化流程 */
    .production-section {
      padding: 80px 0;
      border-bottom: 4px solid var(--border-dark);
    }

    .prod-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .scene-box h3 {
      margin-bottom: 20px;
      font-size: 1.6rem;
    }

    .scene-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .scene-item {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .scene-icon {
      width: 48px;
      height: 48px;
      background: var(--primary);
      border: 2px solid var(--border-dark);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      font-weight: bold;
    }

    /* 流程时间线 */
    .timeline {
      position: relative;
      padding-left: 30px;
      border-left: 4px dashed var(--border-dark);
      margin-left: 20px;
    }

    .timeline-item {
      position: relative;
      margin-bottom: 30px;
    }

    .timeline-item::before {
      content: '';
      position: absolute;
      left: -44px;
      top: 4px;
      width: 24px;
      height: 24px;
      background: var(--secondary);
      border: 3px solid var(--border-dark);
      border-radius: 50%;
    }

    .timeline-title {
      font-size: 1.2rem;
      font-weight: 900;
      margin-bottom: 6px;
    }

    /* 行业解决方案 & 全国网络 */
    .solutions-section {
      padding: 80px 0;
      background: #FFF;
      border-bottom: 4px solid var(--border-dark);
    }

    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-bottom: 50px;
    }

    .sol-card {
      border-top: 8px solid var(--accent-dark);
    }

    .sol-card h4 {
      font-size: 1.3rem;
      font-weight: bold;
      margin-bottom: 12px;
    }

    .network-box {
      background: #FFF;
      border: 3px solid var(--border-dark);
      border-radius: 16px;
      padding: 30px;
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .network-map-desc {
      flex: 1;
    }

    .network-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .network-tag {
      background: var(--accent);
      border: 2px solid var(--border-dark);
      padding: 6px 12px;
      border-radius: 20px;
      font-weight: bold;
      box-shadow: 2px 2px 0px var(--border-dark);
    }

    /* 技术标准 */
    .standards-section {
      padding: 80px 0;
      border-bottom: 4px solid var(--border-dark);
    }

    .standards-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .standard-card {
      text-align: center;
      background: #FFF;
    }

    .standard-num {
      width: 50px;
      height: 50px;
      background: var(--accent);
      border: 3px solid var(--border-dark);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1.3rem;
      margin: 0 auto 16px auto;
      transform: rotate(-10deg);
    }

    /* 培训板块 */
    .training-section {
      padding: 80px 0;
      background: #FFF;
      border-bottom: 4px solid var(--border-dark);
    }

    .training-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .cert-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .cert-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FAF8F5;
      padding: 16px;
      border: 2px solid var(--border-dark);
      border-radius: 8px;
    }

    .cert-info h4 {
      font-weight: 900;
      font-size: 1.1rem;
    }

    .cert-info p {
      font-size: 0.9rem;
      color: #666;
    }

    .cert-badge {
      background: var(--primary);
      font-size: 0.8rem;
      font-weight: bold;
      padding: 4px 10px;
      border: 1.5px solid var(--border-dark);
      border-radius: 4px;
    }

    /* 客户案例中心 (包含横版与方版素材图) */
    .cases-section {
      padding: 80px 0;
      border-bottom: 4px solid var(--border-dark);
    }

    .cases-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 30px;
    }

    .case-banner-area {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .case-banner-img {
      width: 100%;
      border-radius: 12px;
      border: 3px solid var(--border-dark);
      box-shadow: var(--card-shadow);
      object-fit: cover;
    }

    .case-banner-horizontal {
      height: 240px;
    }

    .case-square-area {
      display: grid;
      grid-template-columns: 1fr;
      gap: 20px;
    }

    .case-square-img {
      width: 100%;
      aspect-ratio: 1;
      border-radius: 12px;
      border: 3px solid var(--border-dark);
      box-shadow: var(--card-shadow);
      object-fit: cover;
    }

    /* 对比评测板块 */
    .comparison-section {
      padding: 80px 0;
      background: #FFF;
      border-bottom: 4px solid var(--border-dark);
    }

    .rating-box {
      text-align: center;
      margin-bottom: 40px;
      background: var(--primary);
      padding: 24px;
      border: 3px solid var(--border-dark);
      box-shadow: 4px 4px 0px var(--border-dark);
      border-radius: 12px;
      display: inline-block;
      left: 50%;
      transform: translateX(-50%);
      position: relative;
    }

    .rating-score {
      font-size: 3rem;
      font-weight: 900;
      color: var(--text-color);
    }

    .rating-stars {
      color: var(--secondary);
      font-size: 1.8rem;
      margin: 8px 0;
    }

    .table-container {
      overflow-x: auto;
    }

    table.comp-table {
      width: 100%;
      border-collapse: collapse;
      border: 3px solid var(--border-dark);
      background: #fff;
    }

    table.comp-table th, table.comp-table td {
      border: 2px solid var(--border-dark);
      padding: 16px;
      text-align: center;
      font-weight: bold;
    }

    table.comp-table th {
      background: var(--accent);
    }

    table.comp-table tr.highlight-row {
      background: rgba(255, 230, 0, 0.1);
    }

    .highlight-cell {
      color: var(--secondary);
      font-weight: 900;
    }

    /* Token 比价看板 */
    .token-section {
      padding: 80px 0;
      border-bottom: 4px solid var(--border-dark);
    }

    .token-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .token-card {
      border-top: 6px solid var(--primary);
    }

    .token-header {
      display: flex;
      justify-content: space-between;
      margin-bottom: 12px;
      font-weight: bold;
      border-bottom: 2px dashed #DDD;
      padding-bottom: 8px;
    }

    .token-price {
      font-size: 1.4rem;
      color: var(--secondary);
      font-weight: 900;
    }

    /* 客户评论区 (6条) */
    .reviews-section {
      padding: 80px 0;
      background: #FFF;
      border-bottom: 4px solid var(--border-dark);
    }

    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: #FAF8F5;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-style: italic;
      color: #333;
      margin-bottom: 20px;
      font-size: 0.95rem;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed #CCC;
      padding-top: 12px;
    }

    .author-avatar {
      width: 40px;
      height: 40px;
      background: var(--accent);
      border: 2px solid var(--border-dark);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }

    .author-info h5 {
      font-weight: 900;
      font-size: 0.95rem;
    }

    .author-info span {
      font-size: 0.8rem;
      color: #777;
    }

    /* 需求匹配与联系我们表单 */
    .contact-section {
      padding: 80px 0;
      border-bottom: 4px solid var(--border-dark);
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
    }

    .contact-info-panel h3 {
      font-size: 1.8rem;
      font-weight: 900;
      margin-bottom: 20px;
    }

    .contact-ways {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-bottom: 30px;
    }

    .way-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: bold;
    }

    .way-icon {
      width: 36px;
      height: 36px;
      background: var(--accent);
      border: 2px solid var(--border-dark);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .agent-panel {
      background: var(--primary);
      padding: 20px;
      border: 3px solid var(--border-dark);
      border-radius: 12px;
      box-shadow: 4px 4px 0px var(--border-dark);
    }

    .form-panel h3 {
      font-size: 1.8rem;
      font-weight: 900;
      margin-bottom: 20px;
    }

    .doodle-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group label {
      font-weight: bold;
    }

    .form-control {
      padding: 12px;
      border: 3px solid var(--border-dark);
      border-radius: 8px;
      font-size: 1rem;
      background: #FFF;
      box-shadow: 3px 3px 0px var(--border-dark);
      transition: all 0.2s;
    }

    .form-control:focus {
      outline: none;
      box-shadow: 5px 5px 0px var(--border-dark);
      transform: translate(-2px, -2px);
    }

    /* 常见用户问题 FAQ + AI术语 */
    .faq-section {
      padding: 80px 0;
      background: #FFF;
      border-bottom: 4px solid var(--border-dark);
    }

    .faq-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
    }

    .faq-container {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      border: 2px solid var(--border-dark);
      border-radius: 8px;
      background: #FAF8F5;
      overflow: hidden;
    }

    .faq-header {
      padding: 16px;
      font-weight: bold;
      background: #FFF;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: background-color 0.2s;
    }

    .faq-header:hover {
      background: var(--primary);
    }

    .faq-body {
      padding: 0 16px;
      max-height: 0;
      overflow: hidden;
      transition: all 0.3s ease-in-out;
      background: #FAF8F5;
      border-top: 0px solid var(--border-dark);
    }

    .faq-body p {
      padding: 16px 0;
    }

    .faq-item.active .faq-body {
      max-height: 200px;
      border-top: 2px solid var(--border-dark);
    }

    .faq-toggle-icon {
      transition: transform 0.3s;
      font-size: 1.2rem;
    }

    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }

    /* 自助排查 & 术语百科 */
    .extra-help-panel h3 {
      font-size: 1.5rem;
      font-weight: 900;
      margin-bottom: 20px;
    }

    .trouble-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-bottom: 30px;
    }

    .trouble-item {
      background: #FFF;
      border: 2px solid var(--border-dark);
      padding: 12px;
      border-radius: 8px;
    }

    .trouble-item summary {
      font-weight: bold;
      cursor: pointer;
      outline: none;
    }

    .trouble-item p {
      margin-top: 10px;
      font-size: 0.9rem;
      color: #555;
    }

    .glossary-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .glossary-tag {
      background: var(--accent);
      border: 2px solid var(--border-dark);
      padding: 6px 10px;
      font-size: 0.85rem;
      font-weight: bold;
      border-radius: 4px;
      cursor: pointer;
    }

    /* 行业资讯 / 知识库 */
    .news-section {
      padding: 80px 0;
      border-bottom: 4px solid var(--border-dark);
    }

    .news-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .news-card h4 {
      font-size: 1.2rem;
      font-weight: 900;
      margin-bottom: 10px;
    }

    .news-card p {
      color: #666;
      font-size: 0.9rem;
      margin-bottom: 16px;
    }

    .news-link {
      font-weight: bold;
      color: var(--secondary);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    .news-link:hover {
      text-decoration: underline;
    }

    /* 宣传图展示区 (正文下方，不破坏首屏无图要求) */
    .brand-gallery-section {
      padding: 60px 0;
      background: #FAF8F5;
      border-bottom: 4px solid var(--border-dark);
    }
    
    .gallery-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .gallery-item {
      border: 3px solid var(--border-dark);
      border-radius: 12px;
      box-shadow: var(--card-shadow);
      overflow: hidden;
      background: #FFF;
      display: flex;
      flex-direction: column;
    }

    .gallery-item img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      display: block;
    }

    .gallery-desc {
      padding: 10px;
      font-size: 0.85rem;
      font-weight: bold;
      text-align: center;
      border-top: 2px solid var(--border-dark);
      background: #FFF;
    }

    /* 底部导航与友情链接 */
    footer {
      background: #1E1E1E;
      color: #FAF8F5;
      padding: 60px 0 30px 0;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-about h4 {
      font-size: 1.4rem;
      color: var(--primary);
      margin-bottom: 16px;
      font-weight: 900;
    }

    .footer-about p {
      color: #BBB;
      margin-bottom: 20px;
    }

    .footer-links h4 {
      font-size: 1.1rem;
      color: #FFF;
      margin-bottom: 16px;
      font-weight: 900;
      border-bottom: 2px solid var(--primary);
      display: inline-block;
      padding-bottom: 4px;
    }

    .footer-links ul {
      list-style-type: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links a {
      color: #BBB;
      font-size: 0.95rem;
      transition: color 0.2s;
    }

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

    .friend-links-area {
      border-top: 1px solid #333;
      padding-top: 24px;
      margin-bottom: 24px;
    }

    .friend-links-title {
      font-size: 0.9rem;
      color: #888;
      margin-bottom: 12px;
      font-weight: bold;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friend-links-list a {
      color: #888;
      font-size: 0.85rem;
      transition: color 0.2s;
    }

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

    .footer-bottom {
      border-top: 1px solid #333;
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: #666;
    }

    /* 悬浮客服面板 */
    .float-panel {
      position: fixed;
      right: 20px;
      bottom: 20px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      background: var(--primary);
      border: 3px solid var(--border-dark);
      box-shadow: 3px 3px 0px var(--border-dark);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      cursor: pointer;
      transition: all 0.2s;
      position: relative;
    }

    .float-btn:hover {
      transform: translate(-2px, -2px);
      box-shadow: 5px 5px 0px var(--border-dark);
      background: var(--secondary);
      color: #FFF;
    }

    .qr-tooltip {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #FFF;
      border: 3px solid var(--border-dark);
      border-radius: 8px;
      padding: 10px;
      box-shadow: var(--card-shadow);
      display: none;
      text-align: center;
    }

    .qr-tooltip img {
      width: 120px;
      height: 120px;
      display: block;
    }

    .qr-tooltip span {
      font-size: 0.75rem;
      color: var(--text-color);
      font-weight: bold;
      display: block;
      margin-top: 6px;
    }

    .float-btn:hover .qr-tooltip {
      display: block;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .stats-grid, .services-grid, .solutions-grid, .standards-grid, .reviews-grid, .gallery-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .about-grid, .prod-grid, .training-grid, .cases-grid, .contact-grid, .faq-grid {
        grid-template-columns: 1fr;
      }
      .network-box {
        flex-direction: column;
        align-items: flex-start;
      }
    }

    @media (max-width: 768px) {
      body {
        padding-top: 70px;
      }
      header {
        height: 70px;
      }
      .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: #FFF;
        flex-direction: column;
        padding: 20px;
        border-bottom: 4px solid var(--border-dark);
        gap: 15px;
      }
      .nav-menu.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      h1.hero-title {
        font-size: 2.2rem;
      }
      .stats-grid, .services-grid, .gallery-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }