:root {
      --primary: #2563EB;
      --primary-dark: #1D4ED8;
      --accent: #FF4D00;
      --accent-hover: #E04400;
      --electric: #00D26A;
      --bg-light: #F8FAFC;
      --surface: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-color: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 20px 35px -10px rgba(37, 99, 235, 0.15);
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

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

    .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, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }

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

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      height: 44px;
    }

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

    .brand-name {
      font-size: 20px;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

    .brand-tag {
      background: var(--accent);
      color: #fff;
      font-size: 11px;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 20px;
    }

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

    .nav-links li a {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      font-weight: 700;
      padding: 10px 20px;
      border-radius: 8px;
      cursor: pointer;
      border: none;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: var(--shadow-lg);
    }

    .btn-accent {
      background: var(--accent);
      color: #FFFFFF;
      box-shadow: 0 4px 12px rgba(255, 77, 0, 0.25);
    }

    .btn-accent:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      color: var(--text-main);
      border: 1px solid var(--border-color);
    }

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

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

    /* 首屏 Hero */
    .hero-section {
      padding: 70px 0 50px;
      background: radial-gradient(circle at 85% 15%, rgba(255, 77, 0, 0.08) 0%, rgba(37, 99, 235, 0.08) 50%, rgba(248, 250, 252, 1) 100%);
      border-bottom: 1px solid var(--border-color);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }

    .hero-content {
      max-width: 640px;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #FFFFFF;
      border: 1px solid rgba(37, 99, 235, 0.2);
      padding: 6px 14px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 20px;
      box-shadow: var(--shadow-sm);
    }

    .hero-badge .pulse-dot {
      width: 8px;
      height: 8px;
      background: var(--electric);
      border-radius: 50%;
      box-shadow: 0 0 0 4px rgba(0, 210, 106, 0.2);
    }

    .hero-title {
      font-size: 40px;
      line-height: 1.25;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 18px;
      letter-spacing: -1px;
    }

    .hero-title span {
      color: var(--accent);
    }

    .hero-desc {
      font-size: 17px;
      line-height: 1.7;
      color: var(--text-muted);
      margin-bottom: 28px;
    }

    .hero-action-group {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
      margin-bottom: 36px;
    }

    .hero-action-group .btn {
      padding: 14px 28px;
      font-size: 16px;
    }

    .hero-highlights {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
    }

    .highlight-item h4 {
      font-size: 22px;
      font-weight: 900;
      color: var(--text-main);
    }

    .highlight-item p {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 2px;
    }

    .hero-visual-card {
      background: #FFFFFF;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-md);
      position: relative;
    }

    .hero-visual-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 20px;
      padding-bottom: 14px;
      border-bottom: 1px solid var(--border-color);
    }

    .engine-title {
      font-size: 16px;
      font-weight: 800;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .model-chip-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
      margin-bottom: 20px;
    }

    .model-chip {
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      padding: 12px;
      border-radius: var(--radius-sm);
      display: flex;
      flex-direction: column;
      gap: 4px;
      transition: var(--transition);
    }

    .model-chip:hover {
      border-color: var(--primary);
      background: #FFFFFF;
      box-shadow: var(--shadow-sm);
    }

    .model-chip-name {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-main);
    }

    .model-chip-status {
      font-size: 11px;
      color: var(--electric);
      font-weight: 600;
    }

    .hero-box-banner {
      background: linear-gradient(135deg, #1E293B 0%, #0F172A 100%);
      color: #FFFFFF;
      padding: 16px;
      border-radius: var(--radius-sm);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .hero-box-banner h5 {
      font-size: 14px;
      font-weight: 700;
    }

    .hero-box-banner p {
      font-size: 12px;
      color: #94A3B8;
    }

    /* 通用Section */
    .section {
      padding: 70px 0;
      position: relative;
    }

    .section-alt {
      background-color: #FFFFFF;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 50px;
    }

    .section-subtitle {
      font-size: 13px;
      font-weight: 800;
      text-transform: uppercase;
      color: var(--accent);
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: inline-block;
    }

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

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
    }

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

    .about-text-group h3 {
      font-size: 26px;
      font-weight: 800;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .about-text-group p {
      font-size: 15px;
      color: var(--text-muted);
      margin-bottom: 16px;
    }

    .about-points {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
      margin-top: 24px;
    }

    .about-points li {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      background: var(--bg-light);
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
    }

    .about-points li::before {
      content: "✓";
      color: var(--primary);
      font-weight: 900;
    }

    .about-visual {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

    /* 场景卡片矩阵 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

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

    .feature-tag {
      font-size: 11px;
      font-weight: 700;
      color: var(--primary);
      background: rgba(37, 99, 235, 0.08);
      padding: 4px 10px;
      border-radius: 20px;
    }

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

    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 流程与步骤 */
    .steps-wrapper {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

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

    .step-num {
      font-size: 32px;
      font-weight: 900;
      color: var(--accent);
      margin-bottom: 12px;
      line-height: 1;
    }

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

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

    /* 对比评测模块 */
    .review-score-banner {
      background: linear-gradient(135deg, #1E293B 0%, #0F172A 100%);
      color: #FFFFFF;
      border-radius: var(--radius-lg);
      padding: 36px;
      display: grid;
      grid-template-columns: 1fr 2fr;
      gap: 30px;
      align-items: center;
      margin-bottom: 36px;
    }

    .score-badge-large {
      text-align: center;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 24px;
      border-radius: var(--radius-md);
    }

    .score-num {
      font-size: 56px;
      font-weight: 900;
      color: var(--accent);
      line-height: 1;
      margin-bottom: 6px;
    }

    .score-stars {
      color: #FBBF24;
      font-size: 18px;
      letter-spacing: 2px;
      margin-bottom: 4px;
    }

    .score-label {
      font-size: 13px;
      color: #94A3B8;
    }

    .score-details h3 {
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 12px;
    }

    .score-details p {
      font-size: 14px;
      color: #CBD5E1;
      line-height: 1.7;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
      min-width: 680px;
    }

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

    .compare-table th {
      background: var(--bg-light);
      font-weight: 800;
      color: var(--text-main);
    }

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

    .highlight-col {
      background: rgba(37, 99, 235, 0.03);
      font-weight: 700;
      color: var(--primary);
    }

    /* 案例中心 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .case-card-img-wrap {
      width: 100%;
      aspect-ratio: 16/10;
      background: var(--bg-light);
      overflow: hidden;
    }

    .case-card-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }

    .case-card:hover .case-card-img-wrap img {
      transform: scale(1.04);
    }

    .case-card-body {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .case-card-body h3 {
      font-size: 16px;
      font-weight: 800;
      margin-bottom: 8px;
    }

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

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-card-stars {
      color: #F59E0B;
      font-size: 14px;
      margin-bottom: 12px;
    }

    .review-card p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 16px;
      font-style: italic;
    }

    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .reviewer-avatar {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: var(--primary);
      color: #FFFFFF;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
    }

    .reviewer-meta h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

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

    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 22px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      background: #FFFFFF;
      user-select: none;
    }

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

    .faq-icon {
      font-size: 18px;
      font-weight: 400;
      transition: var(--transition);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: var(--bg-light);
      border-top: 1px solid transparent;
    }

    .faq-answer-inner {
      padding: 18px 22px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      border-top-color: var(--border-color);
    }

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

    /* 需求匹配与联系表单 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-info-col h3 {
      font-size: 24px;
      font-weight: 800;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .contact-info-col p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 24px;
    }

    .contact-details {
      display: flex;
      flex-direction: column;
      gap: 14px;
      margin-bottom: 24px;
    }

    .contact-detail-item {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }

    .qr-box-wrap {
      display: flex;
      align-items: center;
      gap: 16px;
      background: var(--bg-light);
      padding: 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      max-width: 320px;
    }

    .qr-box-wrap img {
      width: 80px;
      height: 80px;
      border-radius: var(--radius-sm);
    }

    .qr-text h5 {
      font-size: 14px;
      font-weight: 800;
    }

    .qr-text p {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 0;
    }

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

    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      font-size: 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: var(--bg-light);
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }

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

    textarea.form-control {
      resize: vertical;
      min-height: 90px;
    }

    /* 文章与资讯 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }

    .article-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }

    .article-card h3 {
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 10px;
      line-height: 1.5;
    }

    .article-card a {
      color: var(--primary);
      font-size: 13px;
      font-weight: 700;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 页脚 */
    .site-footer {
      background: #0F172A;
      color: #94A3B8;
      padding: 60px 0 30px;
      border-top: 1px solid #1E293B;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-brand h4 {
      color: #FFFFFF;
      font-size: 18px;
      font-weight: 800;
      margin-bottom: 14px;
    }

    .footer-brand p {
      font-size: 13px;
      line-height: 1.7;
      margin-bottom: 16px;
    }

    .footer-col h5 {
      color: #FFFFFF;
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links li a {
      font-size: 13px;
      color: #94A3B8;
    }

    .footer-links li a:hover {
      color: #FFFFFF;
    }

    .friend-links-box {
      border-top: 1px solid #1E293B;
      padding-top: 24px;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
    }

    .friend-links-box span {
      font-size: 13px;
      color: #64748B;
      font-weight: 700;
    }

    .friend-links-box a {
      font-size: 13px;
      color: #94A3B8;
    }

    .friend-links-box a:hover {
      color: var(--accent);
    }

    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 20px;
      text-align: center;
      font-size: 12px;
      color: #64748B;
    }

    /* 浮动组件 */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 990;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-kefu-btn {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: #FFFFFF;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
      cursor: pointer;
      font-size: 20px;
      transition: var(--transition);
      border: none;
    }

    .float-kefu-btn:hover {
      transform: scale(1.1);
      background: var(--accent);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .card-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-wrapper {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .about-grid, .contact-wrapper, .review-score-banner {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .nav-links, .nav-cta-group {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
    }

    @media (max-width: 640px) {
      .card-grid, .steps-wrapper, .case-grid, .reviews-grid, .articles-grid, .about-points, .hero-highlights {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 30px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .contact-wrapper {
        padding: 20px;
      }
      .hero-action-group {
        flex-direction: column;
        align-items: stretch;
      }
    }