:root {
      --bg-base: #faf8f5;
      --bg-card: #ffffff;
      --text-main: #1d2129;
      --text-sub: #4e5969;
      --text-muted: #86909c;
      --border-color: #2b2b2b;
      --shadow-solid: 4px 4px 0px #1d2129;
      --shadow-hover: 6px 6px 0px #1d2129;
      --color-yellow: #ffe14d;
      --color-pink: #ff6b8b;
      --color-blue: #3d84ff;
      --color-cyan: #36d399;
      --color-purple: #9b51e0;
      --color-orange: #ff8e3c;
      --container-width: 1200px;
      --radius: 12px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background-color: var(--bg-base);
      background-image: radial-gradient(circle at 1px 1px, rgba(43, 43, 43, 0.08) 1px, transparent 0);
      background-size: 24px 24px;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    ul, ol {
      list-style: none;
    }

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

    .section-wrap {
      padding: 70px 0;
      border-bottom: 2px dashed rgba(43, 43, 43, 0.2);
    }

    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-badge {
      display: inline-block;
      padding: 6px 16px;
      background: var(--color-yellow);
      border: 2px solid var(--border-color);
      border-radius: 20px;
      font-weight: 700;
      font-size: 14px;
      margin-bottom: 12px;
      box-shadow: 2px 2px 0px var(--border-color);
      transform: rotate(-1deg);
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-sub);
      max-width: 680px;
      margin: 0 auto;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: #ffffff;
      border-bottom: 3px solid var(--border-color);
      box-shadow: 0 4px 0 rgba(0,0,0,0.05);
    }

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

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

    .brand-box .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

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

    .nav-links li a {
      font-weight: 600;
      font-size: 15px;
      padding: 8px 14px;
      border-radius: 8px;
      transition: all 0.2s ease;
      display: inline-block;
    }

    .nav-links li a:hover {
      background: var(--color-yellow);
      color: var(--text-main);
    }

    .nav-cta-btn {
      background: var(--color-pink);
      color: #fff !important;
      border: 2px solid var(--border-color);
      box-shadow: 2px 2px 0px var(--border-color);
      font-weight: 700 !important;
    }

    .nav-cta-btn:hover {
      transform: translate(-1px, -1px);
      box-shadow: 4px 4px 0px var(--border-color);
      background: #ff5277 !important;
    }

    .menu-toggle {
      display: none;
      background: var(--color-yellow);
      border: 2px solid var(--border-color);
      padding: 6px 12px;
      font-size: 18px;
      font-weight: bold;
      border-radius: 8px;
      cursor: pointer;
    }

    /* 首屏 Hero (绝无图片) */
    .hero-section {
      padding: 80px 0 60px;
      position: relative;
    }

    .hero-content {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }

    .hero-tag {
      background: var(--color-cyan);
      border: 2px solid var(--border-color);
      padding: 6px 18px;
      font-size: 14px;
      font-weight: 800;
      border-radius: 30px;
      box-shadow: 2px 2px 0px var(--border-color);
      margin-bottom: 24px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .hero-title {
      font-size: 44px;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      color: var(--text-main);
      max-width: 900px;
    }

    .hero-title .highlight {
      background: linear-gradient(180deg, transparent 65%, var(--color-yellow) 65%);
      display: inline;
      padding: 0 4px;
    }

    .hero-p {
      font-size: 18px;
      color: var(--text-sub);
      max-width: 760px;
      margin-bottom: 36px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
    }

    .btn-main {
      background: var(--color-yellow);
      border: 3px solid var(--border-color);
      box-shadow: var(--shadow-solid);
      color: var(--text-main);
      font-size: 18px;
      font-weight: 800;
      padding: 14px 34px;
      border-radius: var(--radius);
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 10px;
      transition: all 0.2s ease;
    }

    .btn-main:hover {
      transform: translate(-2px, -2px);
      box-shadow: var(--shadow-hover);
      background: #ffd61f;
    }

    .btn-secondary {
      background: #ffffff;
      border: 3px solid var(--border-color);
      box-shadow: var(--shadow-solid);
      color: var(--text-main);
      font-size: 18px;
      font-weight: 800;
      padding: 14px 30px;
      border-radius: var(--radius);
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all 0.2s ease;
    }

    .btn-secondary:hover {
      transform: translate(-2px, -2px);
      box-shadow: var(--shadow-hover);
      background: #f4f4f4;
    }

    .hero-stat-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      width: 100%;
      margin-top: 10px;
    }

    .stat-card {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px;
      text-align: center;
      box-shadow: var(--shadow-solid);
      position: relative;
    }

    .stat-num {
      font-size: 32px;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 4px;
      font-family: monospace;
    }

    .stat-label {
      font-size: 14px;
      color: var(--text-sub);
      font-weight: 600;
    }

    /* 平台标签云 */
    .model-tags-bar {
      margin-top: 40px;
      width: 100%;
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px;
      box-shadow: var(--shadow-solid);
      text-align: center;
    }

    .tags-container {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 12px;
    }

    .tag-badge {
      background: #f7f8fa;
      border: 1.5px solid var(--border-color);
      padding: 4px 12px;
      font-size: 13px;
      font-weight: 700;
      border-radius: 6px;
      color: var(--text-main);
      box-shadow: 1px 1px 0px var(--border-color);
    }

    /* 关于我们 / 平台介绍 */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .intro-text-card {
      background: #ffffff;
      border: 3px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-solid);
    }

    .intro-text-card h3 {
      font-size: 24px;
      font-weight: 800;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .intro-text-card p {
      font-size: 15px;
      color: var(--text-sub);
      margin-bottom: 16px;
      line-height: 1.7;
    }

    .intro-feature-list {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 24px;
    }

    .intro-feature-item {
      background: #fcf8f0;
      border: 2px solid var(--border-color);
      padding: 12px 16px;
      border-radius: 8px;
      font-weight: 700;
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .intro-feature-item::before {
      content: "★";
      color: var(--color-purple);
    }

    .media-card {
      background: #ffffff;
      border: 3px solid var(--border-color);
      border-radius: var(--radius);
      padding: 16px;
      box-shadow: var(--shadow-solid);
    }

    .media-card img {
      width: 100%;
      height: auto;
      display: block;
      border-radius: 8px;
      border: 2px solid var(--border-color);
    }

    .media-card-title {
      font-size: 15px;
      font-weight: 700;
      margin-top: 12px;
      text-align: center;
      color: var(--text-main);
    }

    /* 场景与能力网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-box {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-solid);
      transition: all 0.2s ease;
      display: flex;
      flex-direction: column;
      position: relative;
    }

    .service-box:hover {
      transform: translate(-3px, -3px);
      box-shadow: var(--shadow-hover);
    }

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

    .service-tag {
      font-size: 12px;
      font-weight: 700;
      padding: 2px 10px;
      border-radius: 12px;
      border: 1.5px solid var(--border-color);
      background: var(--color-cyan);
    }

    .service-box h3 {
      font-size: 18px;
      font-weight: 800;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .service-box p {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 对比评测表格与评分看板 */
    .review-score-banner {
      background: var(--color-yellow);
      border: 3px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--shadow-solid);
      display: flex;
      align-items: center;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 20px;
      margin-bottom: 36px;
    }

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

    .score-item .label {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .score-item .val {
      font-size: 36px;
      font-weight: 900;
      color: var(--text-main);
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      border: 3px solid var(--border-color);
      border-radius: var(--radius);
      box-shadow: var(--shadow-solid);
      background: #ffffff;
    }

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

    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 2px solid var(--border-color);
      border-right: 1px solid #eaeaea;
      font-size: 14px;
    }

    .eval-table th {
      background: #f7f8fa;
      font-weight: 800;
      color: var(--text-main);
      border-bottom: 3px solid var(--border-color);
    }

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

    .eval-table .highlight-col {
      background: #fffdf0;
      font-weight: 700;
      color: #b35300;
    }

    /* 案例中心展示 */
    .case-gallery-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      align-items: stretch;
    }

    .gallery-large, .gallery-small {
      background: #ffffff;
      border: 3px solid var(--border-color);
      border-radius: var(--radius);
      padding: 16px;
      box-shadow: var(--shadow-solid);
      display: flex;
      flex-direction: column;
    }

    .gallery-img-wrap {
      width: 100%;
      overflow: hidden;
      border: 2px solid var(--border-color);
      border-radius: 8px;
    }

    .gallery-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }

    .gallery-img-wrap:hover img {
      transform: scale(1.02);
    }

    .gallery-desc {
      margin-top: 14px;
    }

    .gallery-desc h3 {
      font-size: 18px;
      font-weight: 800;
      margin-bottom: 6px;
    }

    .gallery-desc p {
      font-size: 13px;
      color: var(--text-sub);
    }

    /* 流程步骤 */
    .step-chain {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .step-node {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px 20px;
      box-shadow: var(--shadow-solid);
      position: relative;
    }

    .step-badge {
      display: inline-block;
      width: 36px;
      height: 36px;
      line-height: 32px;
      text-align: center;
      background: var(--color-blue);
      color: #ffffff;
      font-weight: 900;
      border: 2px solid var(--border-color);
      border-radius: 50%;
      margin-bottom: 14px;
      box-shadow: 2px 2px 0px var(--border-color);
    }

    .step-node h3 {
      font-size: 16px;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .step-node p {
      font-size: 13px;
      color: var(--text-sub);
    }

    /* 客户评论卡片 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-solid);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-stars {
      color: #ff9800;
      font-size: 16px;
      margin-bottom: 10px;
    }

    .review-comment {
      font-size: 14px;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1.5px dashed rgba(43, 43, 43, 0.2);
      padding-top: 12px;
    }

    .author-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--color-purple);
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 2px solid var(--border-color);
    }

    .author-info h4 {
      font-size: 14px;
      font-weight: 800;
    }

    .author-info span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 需求表单与联系我们 */
    .contact-container {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 40px;
    }

    .form-box {
      background: #ffffff;
      border: 3px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-solid);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 14px;
      border: 2px solid var(--border-color);
      border-radius: 8px;
      font-size: 14px;
      background: #fafafa;
      color: var(--text-main);
      outline: none;
      transition: all 0.2s;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      background: #ffffff;
      border-color: #000;
      box-shadow: 2px 2px 0px var(--border-color);
    }

    .form-textarea {
      resize: vertical;
      min-height: 100px;
    }

    .form-submit-btn {
      width: 100%;
      padding: 14px;
      background: var(--color-cyan);
      border: 2px solid var(--border-color);
      border-radius: 8px;
      font-size: 16px;
      font-weight: 800;
      cursor: pointer;
      box-shadow: var(--shadow-solid);
      transition: all 0.2s;
    }

    .form-submit-btn:hover {
      background: #2ec28b;
      transform: translate(-2px, -2px);
      box-shadow: var(--shadow-hover);
    }

    .contact-info-card {
      background: #ffffff;
      border: 3px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-solid);
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .contact-info-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
    }

    .info-label {
      font-weight: 800;
      font-size: 14px;
      min-width: 80px;
    }

    .info-val {
      font-size: 14px;
      color: var(--text-sub);
    }

    .qr-box {
      border: 2px solid var(--border-color);
      border-radius: 8px;
      padding: 12px;
      background: #fdfdfd;
      text-align: center;
      margin-top: 10px;
    }

    .qr-box img {
      max-width: 140px;
      height: auto;
      display: inline-block;
      border-radius: 4px;
      border: 1px solid #ccc;
    }

    .qr-box p {
      font-size: 13px;
      font-weight: 700;
      margin-top: 8px;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius);
      box-shadow: var(--shadow-solid);
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 800;
      font-size: 16px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      background: #ffffff;
    }

    .faq-question::after {
      content: "+";
      font-size: 22px;
      font-weight: bold;
      transition: transform 0.2s;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #fafafa;
      border-top: 1px solid transparent;
    }

    .faq-item.active .faq-answer {
      border-top: 2px dashed var(--border-color);
      max-height: 300px;
      padding: 18px 24px;
    }

    .faq-answer p {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
    }

    /* 文章与资讯链接 */
    .article-box {
      background: #ffffff;
      border: 2px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-solid);
      margin-bottom: 24px;
    }

    .article-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-link-chip {
      background: #f4f6fa;
      border: 1.5px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 600;
      transition: background 0.2s;
    }

    .article-link-chip:hover {
      background: var(--color-yellow);
    }

    /* 友情链接与页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 3px solid var(--border-color);
      padding: 48px 0 24px;
      color: var(--text-main);
    }

    .footer-top {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      gap: 30px;
      margin-bottom: 36px;
    }

    .footer-brand {
      max-width: 320px;
    }

    .footer-brand p {
      font-size: 13px;
      color: var(--text-sub);
      margin-top: 12px;
    }

    .footer-links-group {
      display: flex;
      gap: 40px;
    }

    .footer-col h4 {
      font-size: 15px;
      font-weight: 800;
      margin-bottom: 14px;
    }

    .footer-col ul li {
      margin-bottom: 8px;
    }

    .footer-col ul li a {
      font-size: 13px;
      color: var(--text-sub);
      transition: color 0.2s;
    }

    .footer-col ul li a:hover {
      color: #000;
      text-decoration: underline;
    }

    .friend-links-bar {
      border-top: 1px solid #eaeaea;
      padding-top: 20px;
      margin-bottom: 24px;
    }

    .friend-links-bar h4 {
      font-size: 13px;
      font-weight: 800;
      margin-bottom: 10px;
      color: var(--text-main);
    }

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

    .friend-links-list a {
      font-size: 13px;
      color: var(--text-sub);
    }

    .friend-links-list a:hover {
      color: var(--color-purple);
      text-decoration: underline;
    }

    .footer-bottom {
      text-align: center;
      border-top: 2px solid var(--border-color);
      padding-top: 20px;
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 浮动客服入口 & 回到顶部 */
    .floating-tools {
      position: fixed;
      right: 24px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: var(--color-yellow);
      border: 2px solid var(--border-color);
      border-radius: 50%;
      box-shadow: 2px 2px 0px var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 13px;
      cursor: pointer;
      transition: transform 0.2s;
    }

    .float-btn:hover {
      transform: scale(1.08);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 34px;
      }
      .hero-stat-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .step-chain {
        grid-template-columns: repeat(2, 1fr);
      }
      .reviews-grid {
        grid-template-columns: 1fr;
      }
      .case-gallery-grid {
        grid-template-columns: 1fr;
      }
      .intro-grid {
        grid-template-columns: 1fr;
      }
      .contact-container {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 3px solid var(--border-color);
        padding: 16px 0;
        box-shadow: 0 4px 10px rgba(0,0,0,0.1);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        display: block;
        padding: 12px 0;
      }
      .hero-stat-grid {
        grid-template-columns: 1fr;
      }
      .services-grid {
        grid-template-columns: 1fr;
      }
      .step-chain {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 26px;
      }
      .section-title {
        font-size: 24px;
      }
      .btn-main, .btn-secondary {
        width: 100%;
        justify-content: center;
      }
    }