:root {
      --primary-yellow: #facc15;
      --primary-gold: #eab308;
      --dark-amber: #ca8a04;
      --light-yellow: #fefce8;
      --accent-warm: #fffbeb;
      --text-dark: #18181b;
      --text-muted: #52525b;
      --bg-light: #fafaf9;
      --bg-card: #ffffff;
      --border-color: #fde047;
      --border-soft: #fef08a;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-yellow: 0 10px 15px -3px rgba(234, 179, 8, 0.25);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-full: 9999px;
      --container-width: 1200px;
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--primary-yellow);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .brand-box .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

    .brand-text {
      display: flex;
      flex-direction: column;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-dark);
      letter-spacing: -0.5px;
    }

    .brand-tag {
      font-size: 0.75rem;
      color: var(--dark-amber);
      font-weight: 600;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      display: block;
      padding: 8px 12px;
      color: var(--text-dark);
      text-decoration: none;
      font-size: 0.92rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      background-color: var(--primary-yellow);
      color: #000;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 700;
      border-radius: var(--radius-full);
      text-decoration: none;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 2px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-yellow), var(--primary-gold));
      color: #000;
      box-shadow: 0 4px 12px rgba(234, 179, 8, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(234, 179, 8, 0.45);
      background: linear-gradient(135deg, #fde047, var(--primary-yellow));
    }

    .btn-outline {
      border-color: var(--text-dark);
      color: var(--text-dark);
      background: transparent;
    }

    .btn-outline:hover {
      background: var(--text-dark);
      color: #fff;
    }

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

    /* 模块通用样式 */
    section {
      padding: 70px 0;
      position: relative;
    }

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

    .badge-pill {
      display: inline-block;
      padding: 6px 14px;
      background-color: var(--light-yellow);
      border: 1px solid var(--border-color);
      color: var(--dark-amber);
      font-size: 0.85rem;
      font-weight: 700;
      border-radius: var(--radius-full);
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-dark);
      margin-bottom: 14px;
      line-height: 1.3;
    }

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

    /* 首屏 Hero */
    .hero-section {
      padding: 90px 0 70px;
      background: radial-gradient(circle at 50% 20%, #fef9c3 0%, var(--bg-light) 70%);
      border-bottom: 1px solid var(--border-soft);
      text-align: center;
    }

    .hero-content {
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-h1 {
      font-size: 2.6rem;
      font-weight: 900;
      color: #09090b;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-h1 span.highlight {
      background: linear-gradient(120deg, #ca8a04, #854d0e);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      text-decoration: underline;
      text-decoration-color: var(--primary-yellow);
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 35px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }

    .hero-tags {
      display: flex;
      justify-content: center;
      gap: 10px;
      flex-wrap: wrap;
    }

    .hero-tag-item {
      padding: 6px 16px;
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-full);
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-dark);
      box-shadow: var(--shadow-sm);
    }

    /* 数据指标卡 */
    .stats-bar {
      margin-top: 50px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .stat-card {
      background: #fff;
      padding: 24px 20px;
      border-radius: var(--radius-md);
      border: 2px solid var(--border-soft);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: all 0.3s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      border-color: var(--primary-gold);
      box-shadow: var(--shadow-yellow);
    }

    .stat-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--dark-amber);
      line-height: 1;
      margin-bottom: 8px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 服务与能力网格 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 24px;
    }

    .service-card {
      background: #fff;
      border: 1px solid #e4e4e7;
      border-top: 4px solid var(--primary-yellow);
      border-radius: var(--radius-md);
      padding: 26px 22px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: all 0.25s ease;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-yellow);
      border-top-color: var(--dark-amber);
    }

    .service-icon-box {
      width: 48px;
      height: 48px;
      background: var(--light-yellow);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: var(--dark-amber);
      font-size: 1.2rem;
      margin-bottom: 16px;
    }

    .service-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-dark);
    }

    .service-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.55;
      margin-bottom: 14px;
      flex-grow: 1;
    }

    .service-badge {
      align-self: flex-start;
      font-size: 0.78rem;
      font-weight: 700;
      background: #fef08a;
      color: #713f12;
      padding: 3px 10px;
      border-radius: var(--radius-sm);
    }

    /* 平台矩阵 */
    .model-pills-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 25px;
    }

    .model-pill {
      background: #fff;
      border: 1px solid #e4e4e7;
      padding: 8px 18px;
      border-radius: var(--radius-full);
      font-size: 0.92rem;
      font-weight: 700;
      color: #27272a;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s;
    }

    .model-pill:hover {
      background: var(--primary-yellow);
      border-color: var(--primary-gold);
      transform: scale(1.05);
    }

    /* 对比评测卡片 */
    .rating-header-card {
      background: linear-gradient(135deg, #fffbeb, #fef9c3);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      display: flex;
      align-items: center;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 20px;
      margin-bottom: 35px;
    }

    .rating-item {
      text-align: center;
    }

    .rating-big-score {
      font-size: 3rem;
      font-weight: 900;
      color: #854d0e;
      line-height: 1;
    }

    .rating-stars {
      color: #ca8a04;
      font-size: 1.4rem;
      margin-top: 6px;
    }

    .compare-table-box {
      background: #fff;
      border-radius: var(--radius-lg);
      border: 1px solid #e4e4e7;
      overflow-x: auto;
      box-shadow: var(--shadow-md);
    }

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

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f4f4f5;
    }

    .compare-table th {
      background: #fefce8;
      font-size: 0.95rem;
      font-weight: 800;
      color: var(--text-dark);
    }

    .compare-table tr:hover td {
      background-color: #fafaf9;
    }

    .highlight-col {
      background-color: rgba(250, 204, 21, 0.12);
      font-weight: 700;
      color: #854d0e;
    }

    /* 案例展示区（带图片展示） */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }

    .case-card {
      background: #fff;
      border-radius: var(--radius-md);
      border: 1px solid #e4e4e7;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #f4f4f5;
    }

    .case-img-wrap.square-ratio {
      aspect-ratio: 1 / 1;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.05);
    }

    .case-info {
      padding: 20px;
    }

    .case-info h4 {
      font-size: 1.15rem;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .case-info p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 标准流程时间线 */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .step-item {
      background: #fff;
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid #e4e4e7;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary-yellow);
      border-radius: var(--radius-full);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1rem;
      color: #000;
      margin-bottom: 14px;
    }

    .step-item h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-item p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 客户好评 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .review-card {
      background: #fff;
      border: 1px solid #e4e4e7;
      border-left: 4px solid var(--primary-gold);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .reviewer-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 14px;
    }

    .reviewer-info h4 {
      font-size: 1rem;
      font-weight: 800;
    }

    .reviewer-info span {
      font-size: 0.82rem;
      color: var(--dark-amber);
      font-weight: 600;
    }

    .reviewer-stars {
      color: #eab308;
      font-size: 0.9rem;
    }

    .review-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* FAQ 折叠面板 */
    .faq-accordion {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #fff;
      border: 1px solid #e4e4e7;
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: border-color 0.2s;
    }

    .faq-item.active {
      border-color: var(--primary-gold);
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 22px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 700;
      font-size: 1.02rem;
      color: var(--text-dark);
      background: #fff;
      user-select: none;
    }

    .faq-question:hover {
      background-color: var(--light-yellow);
    }

    .faq-icon {
      font-size: 1.2rem;
      font-weight: bold;
      color: var(--dark-amber);
      transition: transform 0.2s ease;
    }

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

    .faq-answer {
      display: none;
      padding: 0 22px 18px 22px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      border-top: 1px dashed var(--border-soft);
      padding-top: 14px;
      background: #fff;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 需求表单与联系我们 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #fff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-info-col h3 {
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 16px;
    }

    .contact-details {
      list-style: none;
      margin: 20px 0;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .contact-details li {
      font-size: 0.95rem;
      color: var(--text-dark);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .contact-details strong {
      color: var(--dark-amber);
    }

    .qr-container {
      margin-top: 20px;
      padding: 16px;
      background: var(--light-yellow);
      border-radius: var(--radius-md);
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }

    .qr-container img {
      width: 130px;
      height: 130px;
      border-radius: var(--radius-sm);
      object-fit: cover;
      border: 1px solid var(--border-color);
    }

    .qr-container span {
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--dark-amber);
    }

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

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

    .form-group label {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-dark);
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
      padding: 12px 14px;
      border: 1px solid #d4d4d8;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      outline: none;
      transition: all 0.2s ease;
      font-family: inherit;
    }

    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--dark-amber);
      box-shadow: 0 0 0 3px rgba(250, 204, 21, 0.35);
    }

    /* 资讯板块 */
    .article-links-box {
      background: #fff;
      border: 1px solid #e4e4e7;
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .article-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 16px;
    }

    .article-list li a {
      display: block;
      padding: 12px 16px;
      background: var(--light-yellow);
      border-radius: var(--radius-sm);
      text-decoration: none;
      color: var(--text-dark);
      font-weight: 600;
      font-size: 0.92rem;
      transition: all 0.2s;
      border: 1px solid var(--border-soft);
    }

    .article-list li a:hover {
      background: var(--primary-yellow);
      border-color: var(--primary-gold);
      transform: translateX(4px);
    }

    /* 友情链接与页脚 */
    footer.site-footer {
      background: #18181b;
      color: #d4d4d8;
      padding: 50px 0 30px;
      border-top: 4px solid var(--primary-yellow);
    }

    .footer-inner {
      display: flex;
      flex-direction: column;
      gap: 30px;
    }

    .footer-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 15px;
      align-items: center;
      padding-bottom: 25px;
      border-bottom: 1px solid #27272a;
    }

    .footer-links-title {
      font-weight: 700;
      color: var(--primary-yellow);
      font-size: 0.95rem;
    }

    .footer-links-wrap a {
      color: #a1a1aa;
      text-decoration: none;
      font-size: 0.88rem;
      transition: color 0.2s;
    }

    .footer-links-wrap a:hover {
      color: var(--primary-yellow);
      text-decoration: underline;
    }

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.85rem;
      color: #71717a;
    }

    .footer-bottom a {
      color: #a1a1aa;
      text-decoration: none;
    }

    .footer-bottom a:hover {
      color: #fff;
    }

    /* 悬浮客服挂件 */
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      background: var(--primary-yellow);
      border: 2px solid #000;
      border-radius: var(--radius-full);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      color: #000;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
      text-decoration: none;
      transition: all 0.2s;
    }

    .float-btn:hover {
      transform: scale(1.1);
      background: #fde047;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .stats-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links.show {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #fff;
        border-bottom: 2px solid var(--primary-yellow);
        padding: 16px 20px;
        gap: 0;
        box-shadow: var(--shadow-md);
      }
      .nav-links.show li a {
        padding: 12px 16px;
      }
    }

    @media (max-width: 600px) {
      .hero-h1 {
        font-size: 1.85rem;
      }
      .section-title {
        font-size: 1.6rem;
      }
      .stats-bar,
      .process-steps {
        grid-template-columns: 1fr;
      }
      .hero-actions {
        flex-direction: column;
      }
      .btn {
        width: 100%;
      }
    }