:root {
      --primary-color: #2563eb;
      --primary-hover: #1d4ed8;
      --secondary-color: #0ea5e9;
      --accent-color: #8b5cf6;
      --accent-warm: #f59e0b;
      --text-main: #1e293b;
      --text-sub: #475569;
      --text-light: #64748b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --border-focus: #93c5fd;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
    }

    * {
      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, sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    a {
      color: var(--primary-color);
      text-decoration: none;
      transition: color 0.2s ease;
    }

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

    .container {
      width: 100%;
      max-width: 1200px;
      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: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
    }

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

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

    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

    .brand-text {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

    .nav-links li a {
      color: var(--text-sub);
      font-size: 0.95rem;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.2s;
    }

    .nav-links li a:hover {
      color: var(--primary-color);
      background-color: rgba(37, 99, 235, 0.05);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 18px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      transition: all 0.2s ease;
      border: 1px solid transparent;
      text-decoration: none;
      line-height: 1;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
      color: #ffffff;
      box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
    }

    .btn-primary:hover {
      color: #ffffff;
      transform: translateY(-1px);
      box-shadow: 0 6px 14px rgba(37, 99, 235, 0.35);
    }

    .btn-outline {
      border-color: var(--border-color);
      background-color: #ffffff;
      color: var(--text-main);
    }

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

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
      color: var(--text-main);
    }

    /* 通用区块排版 */
    .section {
      padding: 70px 0;
    }

    .section-alt {
      background-color: #f1f5f9;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .section-head {
      text-align: center;
      margin-bottom: 45px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 12px;
      font-size: 0.82rem;
      font-weight: 600;
      color: var(--primary-color);
      background-color: #e0e7ff;
      border-radius: 9999px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-sub);
      max-width: 720px;
      margin: 0 auto;
    }

    /* 首屏 Hero */
    .hero-section {
      position: relative;
      background: radial-gradient(circle at top center, #ffffff 0%, #f0f7ff 60%, #e0f2fe 100%);
      padding: 90px 0 80px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid #bfdbfe;
      border-radius: 9999px;
      font-size: 0.875rem;
      color: var(--primary-color);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.5rem;
      line-height: 1.3;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 20px;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-sub);
      margin-bottom: 32px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .btn-hero-official {
      padding: 13px 30px;
      font-size: 1.05rem;
      background: linear-gradient(135deg, #1d4ed8, #0284c7);
      color: #ffffff;
      border-radius: var(--radius-md);
      box-shadow: 0 6px 18px rgba(29, 78, 216, 0.3);
    }

    .btn-hero-official:hover {
      color: #ffffff;
      transform: translateY(-2px);
      box-shadow: 0 8px 22px rgba(29, 78, 216, 0.4);
    }

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

    .hero-tag-item {
      font-size: 0.85rem;
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 5px 12px;
      border-radius: var(--radius-sm);
      color: var(--text-sub);
    }

    /* 指标统计 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: -35px;
      position: relative;
      z-index: 10;
    }

    .metric-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px 20px;
      text-align: center;
      box-shadow: var(--shadow-md);
      transition: transform 0.2s ease;
    }

    .metric-card:hover {
      transform: translateY(-3px);
    }

    .metric-value {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary-color);
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 0.9rem;
      color: var(--text-sub);
    }

    /* 平台介绍 */
    .platform-intro-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .platform-intro-p {
      font-size: 1.05rem;
      color: var(--text-sub);
      line-height: 1.8;
      margin-bottom: 24px;
    }

    .platform-pillars {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

    .pillar-card {
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
    }

    .pillar-title {
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .pillar-text {
      font-size: 0.9rem;
      color: var(--text-sub);
    }

    /* 场景卡片矩阵 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
      gap: 22px;
    }

    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .service-card:hover {
      border-color: var(--border-focus);
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }

    .service-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 600;
      padding: 3px 8px;
      background: #eff6ff;
      color: var(--primary-color);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      align-self: flex-start;
    }

    .service-title {
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .service-desc {
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .service-meta {
      font-size: 0.85rem;
      color: var(--text-light);
      border-top: 1px dashed var(--border-color);
      padding-top: 12px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    /* 模型矩阵胶囊云 */
    .model-capsules {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 7px 15px;
      border-radius: 9999px;
      font-size: 0.875rem;
      color: var(--text-main);
      font-weight: 500;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .model-pill:hover {
      border-color: var(--primary-color);
      color: var(--primary-color);
      transform: scale(1.04);
    }

    /* 流程步骤 */
    .steps-container {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      position: relative;
    }

    .step-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      position: relative;
    }

    .step-index {
      width: 34px;
      height: 34px;
      background: var(--primary-color);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
      margin-bottom: 14px;
    }

    .step-heading {
      font-size: 1.05rem;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.875rem;
      color: var(--text-sub);
    }

    /* 案例中心媒体展区 */
    .case-gallery {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #e2e8f0;
      overflow: hidden;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s ease;
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.03);
    }

    .case-body {
      padding: 20px;
    }

    .case-title {
      font-size: 1.1rem;
      font-weight: 600;
      margin-bottom: 8px;
    }

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

    /* 对比评测表格与卡片 */
    .review-summary-card {
      background: linear-gradient(135deg, #1e3a8a, #2563eb);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-bottom: 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

    .review-score-title {
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .review-score-desc {
      font-size: 0.95rem;
      opacity: 0.9;
    }

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

    .score-stars {
      color: #fbbf24;
      font-size: 1.4rem;
      margin-bottom: 4px;
    }

    .score-number {
      font-size: 2.2rem;
      font-weight: 800;
    }

    .score-max {
      font-size: 1rem;
      opacity: 0.8;
    }

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

    .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 var(--border-color);
    }

    .compare-table th {
      background: #f8fafc;
      font-size: 0.95rem;
      color: var(--text-main);
      font-weight: 600;
    }

    .compare-table td {
      font-size: 0.9rem;
      color: var(--text-sub);
    }

    .compare-table tr:hover {
      background-color: #f8fafc;
    }

    .highlight-cell {
      color: var(--primary-color) !important;
      font-weight: 600;
      background: rgba(37, 99, 235, 0.02);
    }

    /* Token 比价 */
    .token-table-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .token-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 640px;
    }

    .token-table th, .token-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.9rem;
    }

    .token-table th {
      background: #f8fafc;
      color: var(--text-main);
      font-weight: 600;
    }

    .price-discount {
      color: #16a34a;
      font-weight: 700;
    }

    .price-standard {
      text-decoration: line-through;
      color: var(--text-light);
    }

    /* 用户评论 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 20px;
    }

    .testimonial-card {
      background: #ffffff;
      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;
    }

    .testimonial-body {
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.65;
      margin-bottom: 18px;
      font-style: italic;
    }

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

    .user-avatar-dummy {
      width: 40px;
      height: 40px;
      background: #e2e8f0;
      color: var(--primary-color);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
    }

    .user-name {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .user-role {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 22px;
      background: none;
      border: none;
      font-size: 1.02rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

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

    .faq-answer {
      display: none;
      padding: 0 22px 18px 22px;
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.65;
    }

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

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

    /* 表单与联系模块 */
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: flex-start;
    }

    .contact-form-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 11px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #ffffff;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    .contact-meta-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .meta-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .meta-icon {
      width: 36px;
      height: 36px;
      background: #eff6ff;
      color: var(--primary-color);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      flex-shrink: 0;
    }

    .meta-content {
      font-size: 0.92rem;
      color: var(--text-sub);
    }

    .meta-title {
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 2px;
    }

    .qr-card {
      text-align: center;
      background: #f8fafc;
      border: 1px dashed var(--border-color);
      border-radius: var(--radius-md);
      padding: 18px;
    }

    .qr-card img {
      max-width: 140px;
      height: auto;
      border-radius: var(--radius-sm);
      display: block;
      margin: 0 auto 8px auto;
    }

    /* 资讯与文章列表 */
    .article-links-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .article-links-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 14px;
      list-style: none;
    }

    .article-link-item a {
      display: block;
      padding: 10px 14px;
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      color: var(--text-main);
      transition: all 0.2s;
    }

    .article-link-item a:hover {
      border-color: var(--primary-color);
      color: var(--primary-color);
      background: #ffffff;
    }

    /* 宣传横幅图区 */
    .banner-strip {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
      margin-top: 30px;
    }

    .banner-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: #e2e8f0;
    }

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

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 50px 0 30px 0;
      border-top: 1px solid #1e293b;
    }

    .footer-content {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.25rem;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.7;
      max-width: 400px;
    }

    .footer-links-col h5 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 16px;
    }

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

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

    .footer-links-col a {
      color: #94a3b8;
      font-size: 0.9rem;
    }

    .footer-links-col a:hover {
      color: #ffffff;
    }

    .friend-links-wrap {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-bottom: 24px;
    }

    .friend-links-title {
      font-size: 0.85rem;
      color: #64748b;
      margin-bottom: 10px;
    }

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

    .friend-links a {
      color: #94a3b8;
      font-size: 0.85rem;
    }

    .friend-links a:hover {
      color: #38bdf8;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* 悬浮组件 */
    .float-kefu-btn {
      position: fixed;
      right: 20px;
      bottom: 20px;
      width: 52px;
      height: 52px;
      background: var(--primary-color);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
      cursor: pointer;
      z-index: 999;
      transition: transform 0.2s;
      text-decoration: none;
    }

    .float-kefu-btn:hover {
      transform: scale(1.08);
      color: #ffffff;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-layout {
        grid-template-columns: 1fr;
      }
      .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 1.85rem;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
      }
      .header-actions .btn {
        display: none;
      }
      .metrics-grid {
        grid-template-columns: 1fr;
        margin-top: 20px;
      }
    }