:root {
      --primary: #0052d9;
      --primary-hover: #003cab;
      --primary-light: #ecf2fe;
      --accent: #00a870;
      --warning: #ed7b2f;
      --text-main: #182026;
      --text-regular: #4b5563;
      --text-muted: #6b7280;
      --bg-page: #f6f8fb;
      --bg-white: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --container-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease;
    }

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

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

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

    .brand-box .ai-page-logo {
      height: 38px;
      width: auto;
    }

    .brand-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
    }

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

    .nav-links a {
      padding: 8px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-regular);
      border-radius: var(--radius-sm);
    }

    .nav-links a:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
    }

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

    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(0, 82, 217, 0.25);
    }

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

    .btn-outline:hover {
      background-color: var(--primary-light);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 80% 20%, #e0edff 0%, #f6f8fb 60%);
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      background-color: var(--primary-light);
      color: var(--primary);
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 24px;
      border: 1px solid rgba(0, 82, 217, 0.15);
    }

    .hero-title {
      font-size: 40px;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      max-width: 820px;
      margin: 0 auto 36px;
      font-size: 18px;
      color: var(--text-regular);
      line-height: 1.7;
    }

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

    .hero-btn-main {
      padding: 14px 36px;
      font-size: 17px;
      background-color: var(--primary);
      color: #ffffff !important;
      border-radius: var(--radius-sm);
      box-shadow: 0 6px 20px rgba(0, 82, 217, 0.3);
    }

    .hero-btn-main:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
    }

    .metrics-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: var(--bg-white);
      padding: 30px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
      text-align: left;
    }

    .metric-item-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .metric-item-label {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 通用章节 */
    .section-block {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-head {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--primary);
      margin-bottom: 8px;
      display: block;
      letter-spacing: 1px;
    }

    .section-title {
      font-size: 30px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
    }

    /* 平台介绍 */
    .intro-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .intro-card {
      background: var(--bg-white);
      padding: 36px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .intro-card p {
      font-size: 16px;
      color: var(--text-regular);
      margin-bottom: 16px;
      line-height: 1.8;
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 24px;
    }

    .tag-chip {
      background-color: var(--bg-page);
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      color: var(--text-regular);
      font-weight: 500;
    }

    .model-roster {
      background: var(--primary-light);
      padding: 32px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(0, 82, 217, 0.2);
    }

    .model-roster h3 {
      font-size: 18px;
      color: var(--primary);
      margin-bottom: 16px;
      font-weight: 700;
    }

    .model-list {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .model-item {
      background: var(--bg-white);
      padding: 5px 12px;
      border-radius: 4px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-regular);
      border: 1px solid var(--border-color);
    }

    /* 服务场景网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .service-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(0, 82, 217, 0.3);
    }

    .service-icon {
      width: 44px;
      height: 44px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 18px;
      margin-bottom: 18px;
    }

    .service-card h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

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

    /* 流程步骤 */
    .steps-wrapper {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }

    .step-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }

    .step-num {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      opacity: 0.3;
      margin-bottom: 12px;
    }

    .step-card h3 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    /* 素材与案例展示 */
    .media-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-bottom: 30px;
    }

    .media-box {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .media-box-caption {
      padding: 16px 20px;
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
    }

    .banner-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }

    .banner-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    /* 对比评测模块 */
    .eval-score-card {
      background: linear-gradient(135deg, #0052d9 0%, #003cab 100%);
      color: #ffffff;
      padding: 36px;
      border-radius: var(--radius-md);
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 30px;
    }

    .score-left h3 {
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .score-left p {
      font-size: 15px;
      opacity: 0.9;
    }

    .score-badge-area {
      text-align: right;
    }

    .score-num {
      font-size: 48px;
      font-weight: 900;
      line-height: 1;
      color: #ffe066;
    }

    .score-stars {
      font-size: 18px;
      margin-top: 4px;
      letter-spacing: 2px;
    }

    .eval-table-box {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }

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

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

    .eval-table th {
      background-color: var(--bg-page);
      font-weight: 700;
      color: var(--text-main);
    }

    .eval-highlight {
      background-color: #f0f7ff;
      font-weight: 600;
      color: var(--primary);
    }

    /* Token 比价 */
    .token-price-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .token-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .token-card.featured {
      border: 2px solid var(--primary);
      position: relative;
    }

    .token-card h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .token-price {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 16px;
    }

    .token-price span {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: normal;
    }

    .token-features {
      list-style: none;
      text-align: left;
      font-size: 14px;
      color: var(--text-regular);
      margin-bottom: 24px;
    }

    .token-features li {
      padding: 6px 0;
      border-bottom: 1px dashed var(--border-color);
    }

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

    .review-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-quote {
      font-size: 14px;
      color: var(--text-regular);
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .review-user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

    .user-avatar-tag {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 14px;
    }

    .user-meta-name {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

    .user-meta-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 文章与资讯 */
    .articles-block {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
    }

    .article-links-row {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 16px;
    }

    .article-pill {
      background: var(--bg-page);
      border: 1px solid var(--border-color);
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
      color: var(--primary);
    }

    .article-pill:hover {
      background-color: var(--primary-light);
    }

    /* FAQ 手风琴 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.2s ease;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-toggle-sign {
      font-size: 20px;
      line-height: 1;
      font-weight: 400;
      color: var(--text-muted);
      transition: transform 0.2s;
    }

    .faq-card.open .faq-toggle-sign {
      transform: rotate(45deg);
      color: var(--primary);
    }

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-regular);
      line-height: 1.7;
    }

    .faq-card.open .faq-answer {
      display: block;
    }

    /* 表单与需求匹配 */
    .form-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: var(--bg-white);
      padding: 40px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .form-info h3 {
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .form-info p {
      font-size: 15px;
      color: var(--text-regular);
      margin-bottom: 24px;
    }

    .kefu-qr-box {
      margin-top: 20px;
      display: inline-block;
      text-align: center;
      border: 1px solid var(--border-color);
      padding: 12px;
      border-radius: var(--radius-sm);
      background: var(--bg-page);
    }

    .kefu-qr-box img {
      width: 130px;
      height: 130px;
      margin: 0 auto 8px;
    }

    .form-group {
      margin-bottom: 16px;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 11px 14px;
      font-size: 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #fafafa;
      color: var(--text-main);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
    }

    /* 代理加盟政策 */
    .agent-card {
      background: linear-gradient(135deg, #fefbf5 0%, #fff7eb 100%);
      border: 1px solid #fed7aa;
      border-radius: var(--radius-md);
      padding: 36px;
    }

    .agent-card h3 {
      font-size: 22px;
      font-weight: 700;
      color: #9a3412;
      margin-bottom: 12px;
    }

    .agent-card p {
      font-size: 15px;
      color: #7c2d12;
      line-height: 1.7;
      margin-bottom: 20px;
    }

    /* 友情链接与页脚 */
    .site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 48px 0 24px;
      font-size: 14px;
      color: var(--text-regular);
    }

    .footer-top {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 36px;
    }

    .footer-col h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .footer-col p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.8;
    }

    .footer-col ul {
      list-style: none;
    }

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

    .footer-col ul a {
      color: var(--text-regular);
      font-size: 13px;
    }

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

    .friend-links-wrap {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      margin-bottom: 24px;
    }

    .friend-links-title {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 10px;
    }

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

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

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

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 浮动入口 */
    .float-contact {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-lg);
      cursor: pointer;
      font-size: 13px;
      font-weight: 700;
      border: none;
      transition: transform 0.2s;
    }

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

    /* 响应式断点 */
    @media (max-width: 992px) {
      .grid-3, .grid-4, .steps-wrapper, .token-price-grid, .reviews-grid, .banner-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .intro-grid, .form-layout, .footer-top {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 32px;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .nav-actions {
        display: none;
      }
      .hero-section {
        padding: 50px 0 40px;
      }
      .hero-title {
        font-size: 26px;
      }
      .hero-subtitle {
        font-size: 15px;
      }
      .grid-3, .grid-4, .steps-wrapper, .token-price-grid, .reviews-grid, .media-grid, .banner-row {
        grid-template-columns: 1fr;
      }
      .metrics-bar {
        grid-template-columns: 1fr;
      }
      .eval-score-card {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
      .score-badge-area {
        text-align: center;
      }
    }