:root {
      --primary-cyan: #0fa4af;
      --primary-teal: #028090;
      --deep-teal: #004e64;
      --accent-cyan: #25a18e;
      --bg-gradient: linear-gradient(180deg, #f0fbfc 0%, #ffffff 400px, #f4fafb 100%);
      --bg-light: #f7fcfe;
      --card-bg: #ffffff;
      --text-main: #192a32;
      --text-sub: #4b636e;
      --text-light: #8397a1;
      --border-color: #d6e8ea;
      --primary-gradient: linear-gradient(135deg, #0fa4af 0%, #028090 100%);
      --hover-gradient: linear-gradient(135deg, #028090 0%, #004e64 100%);
      --card-shadow: 0 10px 30px rgba(15, 164, 175, 0.08);
      --card-shadow-hover: 0 16px 36px rgba(15, 164, 175, 0.16);
      --border-radius: 12px;
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      color: var(--text-main);
      background: var(--bg-gradient);
      line-height: 1.65;
      overflow-x: hidden;
      min-height: 100vh;
    }

    a {
      color: var(--primary-teal);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--deep-teal);
    }

    ul, ol {
      list-style: none;
    }

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

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 12px rgba(0, 78, 100, 0.04);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

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

    .brand-logo .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--deep-teal);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links li a {
      color: var(--text-main);
      font-size: 0.95rem;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: 6px;
      display: block;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary-teal);
      background: rgba(15, 164, 175, 0.08);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      font-size: 0.95rem;
      text-align: center;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(15, 164, 175, 0.35);
    }

    .btn-primary:hover {
      background: var(--hover-gradient);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(2, 128, 144, 0.45);
    }

    .btn-outline {
      border-color: var(--primary-cyan);
      color: var(--primary-cyan) !important;
      background: #ffffff;
    }

    .btn-outline:hover {
      background: var(--primary-cyan);
      color: #ffffff !important;
      transform: translateY(-2px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--deep-teal);
      cursor: pointer;
      padding: 4px;
    }

    /* 区域通配样式 */
    .section {
      padding: 80px 0;
      position: relative;
    }

    .section-alt {
      background: #f3fafb;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background: rgba(15, 164, 175, 0.12);
      color: var(--deep-teal);
      font-size: 0.85rem;
      font-weight: 700;
      border-radius: 50px;
      margin-bottom: 12px;
      border: 1px solid rgba(15, 164, 175, 0.25);
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: var(--deep-teal);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-sub);
    }

    /* Hero 首屏（无图片，纯CSS与渐变质感） */
    .hero-section {
      padding: 100px 0 80px 0;
      background: radial-gradient(circle at 80% 20%, rgba(37, 161, 142, 0.12) 0%, rgba(255, 255, 255, 0) 50%),
                  radial-gradient(circle at 10% 80%, rgba(15, 164, 175, 0.15) 0%, rgba(255, 255, 255, 0) 50%),
                  linear-gradient(180deg, #ecf9fb 0%, #ffffff 100%);
      border-bottom: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }

    .hero-container {
      max-width: 920px;
    }

    .hero-badge-wrap {
      margin-bottom: 20px;
    }

    .hero-badge {
      background: #ffffff;
      color: var(--deep-teal);
      padding: 6px 18px;
      border-radius: 30px;
      border: 1px solid var(--border-color);
      font-size: 0.9rem;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(0,0,0,0.03);
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 800;
      color: var(--deep-teal);
      line-height: 1.25;
      margin-bottom: 24px;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-sub);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .hero-actions .btn {
      padding: 14px 34px;
      font-size: 1.05rem;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .stat-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--border-radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-color: var(--primary-cyan);
    }

    .stat-val {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-cyan);
      margin-bottom: 4px;
      font-family: inherit;
    }

    .stat-lbl {
      font-size: 0.9rem;
      color: var(--text-sub);
      font-weight: 500;
    }

    /* 平台核心矩阵 */
    .platform-chips-wrap {
      margin-top: 30px;
      padding: 20px;
      background: #ffffff;
      border-radius: var(--border-radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }
    .platform-chips-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--deep-teal);
      margin-bottom: 12px;
      text-align: center;
    }
    .chips-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      justify-content: center;
    }
    .chip {
      background: #f0fbfc;
      color: var(--deep-teal);
      border: 1px solid #d0ecf0;
      padding: 4px 12px;
      border-radius: 6px;
      font-size: 0.85rem;
      font-weight: 600;
      transition: var(--transition);
    }
    .chip:hover {
      background: var(--primary-cyan);
      color: #fff;
    }

    /* 业务卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    .feature-card {
      background: var(--card-bg);
      border-radius: var(--border-radius);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-shadow-hover);
      border-color: var(--primary-cyan);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: rgba(15, 164, 175, 0.12);
      color: var(--primary-teal);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      font-weight: bold;
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 1.25rem;
      color: var(--deep-teal);
      margin-bottom: 10px;
    }

    .feature-card p {
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 流程图卡片 */
    .step-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--border-radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      position: relative;
      transition: var(--transition);
    }
    .step-card:hover {
      border-color: var(--primary-cyan);
      transform: translateY(-3px);
    }
    .step-num {
      display: inline-block;
      width: 36px;
      height: 36px;
      line-height: 36px;
      text-align: center;
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 700;
      border-radius: 50%;
      margin-bottom: 14px;
    }
    .step-card h3 {
      font-size: 1.15rem;
      color: var(--deep-teal);
      margin-bottom: 8px;
    }
    .step-card p {
      font-size: 0.9rem;
      color: var(--text-sub);
    }

    /* 对比评测表格与卡片 */
    .eval-overview-box {
      background: #ffffff;
      border: 2px solid var(--primary-cyan);
      border-radius: var(--border-radius);
      padding: 24px 32px;
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: var(--card-shadow);
    }
    .eval-score-wrap {
      display: flex;
      align-items: baseline;
      gap: 10px;
    }
    .eval-score-num {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--primary-cyan);
    }
    .eval-score-max {
      font-size: 1.1rem;
      color: var(--text-sub);
    }
    .eval-stars {
      color: #f59e0b;
      font-size: 1.3rem;
      letter-spacing: 2px;
    }

    .table-container {
      background: #ffffff;
      border-radius: var(--border-radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      overflow-x: auto;
    }

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .eval-table th {
      background: #f0fbfc;
      color: var(--deep-teal);
      font-weight: 700;
    }

    .eval-table tr:last-child td {
      border-bottom: none;
    }

    .eval-table tr:hover td {
      background: rgba(15, 164, 175, 0.03);
    }

    .col-highlight {
      background: rgba(15, 164, 175, 0.05);
      font-weight: 600;
      color: var(--primary-teal);
    }

    /* 案例中心展示 */
    .case-card {
      background: #ffffff;
      border-radius: var(--border-radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-shadow-hover);
    }
    .case-img-wrap {
      width: 100%;
      height: 200px;
      background: #eef6f7;
      overflow: hidden;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.04);
    }
    .case-body {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .case-body h3 {
      font-size: 1.15rem;
      color: var(--deep-teal);
      margin-bottom: 8px;
    }
    .case-body p {
      font-size: 0.9rem;
      color: var(--text-sub);
      margin-bottom: 12px;
      flex-grow: 1;
    }
    .case-tag {
      align-self: flex-start;
      background: #e6f6f8;
      color: var(--primary-teal);
      padding: 3px 10px;
      border-radius: 4px;
      font-size: 0.8rem;
      font-weight: 600;
    }

    /* 用户评论卡片 */
    .testimonial-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--border-radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .testimonial-card:hover {
      border-color: var(--primary-cyan);
      transform: translateY(-3px);
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .user-avatar-badge {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }
    .user-info h4 {
      font-size: 1rem;
      color: var(--deep-teal);
    }
    .user-info span {
      font-size: 0.85rem;
      color: var(--text-light);
    }
    .testimonial-text {
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* FAQ 手风琴面板 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      transition: var(--transition);
    }
    .faq-item.active {
      border-color: var(--primary-cyan);
    }
    .faq-question {
      width: 100%;
      padding: 18px 24px;
      background: #ffffff;
      border: none;
      text-align: left;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--deep-teal);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: var(--transition);
    }
    .faq-question:hover {
      background: #f7fcfe;
    }
    .faq-toggle-icon {
      font-size: 1.25rem;
      transition: transform 0.3s ease;
      color: var(--primary-teal);
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background: #fcfefe;
    }
    .faq-item.active .faq-answer {
      max-height: 260px;
      padding: 0 24px 20px 24px;
    }
    .faq-answer p {
      font-size: 0.95rem;
      color: var(--text-sub);
      line-height: 1.65;
    }

    /* 需求匹配与表单 */
    .form-wrapper {
      background: #ffffff;
      border-radius: var(--border-radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      padding: 36px;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-group label {
      display: block;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--deep-teal);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
      background: #fdfefe;
      transition: var(--transition);
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary-cyan);
      box-shadow: 0 0 0 3px rgba(15, 164, 175, 0.15);
      background: #ffffff;
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* 招商加盟卡片 */
    .agent-box {
      background: linear-gradient(135deg, #004e64 0%, #028090 100%);
      color: #ffffff;
      border-radius: var(--border-radius);
      padding: 48px;
      box-shadow: var(--card-shadow);
    }
    .agent-box h3 {
      font-size: 2rem;
      margin-bottom: 16px;
      color: #ffffff;
    }
    .agent-box p {
      font-size: 1.05rem;
      color: #e0f2f5;
      margin-bottom: 28px;
      max-width: 680px;
      line-height: 1.7;
    }
    .agent-perks {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-bottom: 32px;
    }
    .perk-item {
      background: rgba(255, 255, 255, 0.1);
      padding: 18px;
      border-radius: 8px;
      border: 1px solid rgba(255, 255, 255, 0.2);
    }
    .perk-item h4 {
      font-size: 1.1rem;
      color: #ffffff;
      margin-bottom: 6px;
    }
    .perk-item p {
      font-size: 0.85rem;
      color: #e0f2f5;
      margin-bottom: 0;
    }

    /* 宣传展示条 */
    .promo-gallery {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 36px;
    }
    .promo-gallery .ai-page-image {
      border-radius: 8px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      width: 100%;
      height: 180px;
      object-fit: cover;
    }

    /* 文章与资讯列表 */
    .article-list {
      background: #ffffff;
      border-radius: var(--border-radius);
      border: 1px solid var(--border-color);
      padding: 24px 32px;
      box-shadow: var(--card-shadow);
    }
    .article-item {
      padding: 14px 0;
      border-bottom: 1px dashed var(--border-color);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .article-item:last-child {
      border-bottom: none;
    }
    .article-link {
      font-size: 1rem;
      color: var(--text-main);
      font-weight: 500;
    }
    .article-link:hover {
      color: var(--primary-cyan);
      padding-left: 6px;
    }
    .article-date {
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* 底部通用规范 */
    .site-footer {
      background: #002d3a;
      color: #b0c9d1;
      padding: 60px 0 30px 0;
      border-top: 1px solid #004254;
      font-size: 0.95rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1.1rem;
      margin-bottom: 18px;
      position: relative;
    }
    .footer-col h4::after {
      content: "";
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 28px;
      height: 2px;
      background: var(--primary-cyan);
    }
    .footer-col ul li {
      margin-bottom: 10px;
    }
    .footer-col ul li a {
      color: #b0c9d1;
    }
    .footer-col ul li a:hover {
      color: #ffffff;
      padding-left: 4px;
    }
    .footer-qr-wrap {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-top: 14px;
    }
    .footer-qr-wrap img {
      width: 90px;
      height: 90px;
      border-radius: 6px;
      background: #ffffff;
      padding: 4px;
    }
    .footer-bottom {
      text-align: center;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.85rem;
      color: #7b9aa4;
    }
    .friend-links-wrap {
      margin-top: 16px;
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 12px;
    }
    .friend-links-wrap a {
      color: #7b9aa4;
      font-size: 0.85rem;
    }
    .friend-links-wrap a:hover {
      color: #ffffff;
    }

    /* 悬浮客服面板 */
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      background: var(--primary-gradient);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(0,0,0,0.15);
      cursor: pointer;
      position: relative;
      transition: var(--transition);
      border: none;
    }
    .float-btn:hover {
      transform: scale(1.08);
    }
    .qr-popover {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 8px;
      box-shadow: 0 10px 25px rgba(0,0,0,0.15);
      display: none;
      width: 140px;
      text-align: center;
      color: var(--text-main);
      font-size: 0.8rem;
      border: 1px solid var(--border-color);
    }
    .float-btn:hover .qr-popover {
      display: block;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .grid-4, .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .agent-perks {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 24px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.08);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-4, .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .promo-gallery {
        grid-template-columns: 1fr;
      }
      .eval-overview-box {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
      }
    }