:root {
      --primary: #4f46e5;
      --primary-light: #6366f1;
      --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
      --accent-rainbow: linear-gradient(135deg, #ec4899 0%, #8b5cf6 50%, #06b6d4 100%);
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --text-main: #0f172a;
      --text-secondary: #475569;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.03);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.06), 0 2px 4px -1px rgba(0,0,0,0.03);
      --shadow-hover: 0 14px 30px -4px rgba(79, 70, 229, 0.12), 0 8px 12px -3px rgba(0,0,0,0.04);
      --container-max: 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-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
      background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(6, 182, 212, 0.05) 0px, transparent 50%);
      background-attachment: fixed;
    }

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      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, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 1px 4px rgba(0,0,0,0.02);
    }

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

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

    .ai-page-logo {
      height: 42px;
      width: auto;
      max-width: 100%;
      object-fit: contain;
      display: block;
    }

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

    .nav-links a {
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
      white-space: nowrap;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      background-color: #f1f5f9;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
      text-align: center;
      line-height: 1.2;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
      color: #ffffff;
    }

    .btn-outline {
      border-color: #cbd5e1;
      color: var(--text-main);
      background: #ffffff;
    }

    .btn-outline:hover {
      background: #f8fafc;
      border-color: var(--primary);
      color: var(--primary);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 区域通用样式 */
    .section-spacing {
      padding: 72px 0;
    }

    .section-title-wrap {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 48px;
    }

    .section-badge {
      display: inline-block;
      padding: 6px 14px;
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      border-radius: 9999px;
      background: #eef2ff;
      color: var(--primary);
      margin-bottom: 12px;
      border: 1px solid rgba(79, 70, 229, 0.15);
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-secondary);
      line-height: 1.6;
    }

    /* 首屏 Hero (无图片) */
    .hero-section {
      padding: 80px 0 60px;
      background: linear-gradient(180deg, rgba(255,255,255,0.9) 0%, rgba(248,250,252,0.8) 100%);
      position: relative;
    }

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

    .hero-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #eff6ff;
      border: 1px solid #bfdbfe;
      border-radius: 9999px;
      color: #1d4ed8;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 36px;
      line-height: 1.6;
    }

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

    .hero-btn-prominent {
      font-size: 1.1rem;
      padding: 14px 34px;
      box-shadow: 0 10px 25px rgba(79, 70, 229, 0.35);
    }

    /* 首屏数据指标卡片 (纯CSS) */
    .hero-metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .metric-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      position: relative;
      overflow: hidden;
    }

    .metric-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: var(--accent-rainbow);
    }

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

    .metric-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
      font-feature-settings: "tnum";
    }

    .metric-label {
      font-size: 0.9rem;
      color: var(--text-secondary);
      font-weight: 500;
    }

    /* 平台支持模型云 */
    .model-tags-section {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 36px 0;
    }

    .model-tags-title {
      text-align: center;
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 20px;
      letter-spacing: 1px;
    }

    .model-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }

    .model-pill {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      color: var(--text-main);
      padding: 6px 14px;
      border-radius: 9999px;
      font-size: 0.85rem;
      font-weight: 600;
      transition: all 0.2s ease;
    }

    .model-pill:hover {
      background: #eef2ff;
      border-color: var(--primary-light);
      color: var(--primary);
      transform: scale(1.04);
    }

    /* 平台核心介绍卡片 */
    .about-cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .about-feature-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .about-feature-box:hover {
      box-shadow: var(--shadow-hover);
      border-color: #cbd5e1;
      transform: translateY(-3px);
    }

    .about-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: #f1f5f9;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1.25rem;
      margin-bottom: 18px;
    }

    .about-feature-box h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .about-feature-box p {
      font-size: 0.95rem;
      color: var(--text-secondary);
      line-height: 1.6;
    }

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

    .scenario-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .scenario-card:hover {
      border-color: #a5b4fc;
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .scenario-badge {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--primary);
      background: #eef2ff;
      padding: 4px 10px;
      border-radius: 4px;
      align-self: flex-start;
      margin-bottom: 14px;
    }

    .scenario-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .scenario-card p {
      font-size: 0.9rem;
      color: var(--text-secondary);
      line-height: 1.55;
      flex-grow: 1;
    }

    /* 标准制作流程 */
    .workflow-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

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

    .step-number {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 800;
      font-size: 1rem;
      margin-bottom: 16px;
    }

    .workflow-step h3 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .workflow-step p {
      font-size: 0.88rem;
      color: var(--text-secondary);
      line-height: 1.5;
    }

    /* 对比评测专属板块 */
    .rating-banner {
      background: #ffffff;
      border: 1px solid #c7d2fe;
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-md);
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }

    .rating-info-left {
      max-width: 600px;
    }

    .rating-score-box {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-md);
      padding: 20px 32px;
      text-align: center;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 1.4rem;
      letter-spacing: 2px;
      margin-bottom: 6px;
    }

    .score-huge {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1;
    }

    .score-huge span {
      font-size: 1.2rem;
      color: var(--text-muted);
      font-weight: 500;
    }

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

    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }

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

    .comp-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

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

    .highlight-col {
      background: #f5f7ff;
      font-weight: 600;
      color: var(--primary);
    }

    .badge-win {
      display: inline-block;
      background: #dcfce7;
      color: #15803d;
      padding: 2px 8px;
      border-radius: 4px;
      font-size: 0.8rem;
      font-weight: 700;
    }

    /* 案例中心展示（合规使用指定图片） */
    .case-gallery-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

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

    .case-img-container {
      width: 100%;
      overflow: hidden;
      background: #f1f5f9;
      position: relative;
    }

    .ai-page-image {
      width: 100%;
      height: auto;
      max-width: 100%;
      display: block;
      transition: transform 0.3s ease;
    }

    .case-gallery-item:hover .ai-page-image {
      transform: scale(1.02);
    }

    .case-info {
      padding: 20px;
      flex-grow: 1;
    }

    .case-info h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .case-info p {
      font-size: 0.9rem;
      color: var(--text-secondary);
      line-height: 1.5;
    }

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

    .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-content {
      font-size: 0.92rem;
      color: var(--text-secondary);
      line-height: 1.6;
      margin-bottom: 20px;
      position: relative;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 16px;
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #e2e8f0;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .author-details h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-details span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ 手风琴样式 */
    .faq-list {
      max-width: 900px;
      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;
      transition: all 0.2s ease;
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }

    .faq-icon {
      font-size: 1.25rem;
      font-weight: 400;
      color: var(--text-muted);
      transition: transform 0.2s ease;
    }

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.95rem;
      color: var(--text-secondary);
      line-height: 1.6;
      border-top: 1px solid transparent;
    }

    .faq-item.active {
      border-color: #cbd5e1;
      box-shadow: var(--shadow-sm);
    }

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

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

    .faq-item.active .faq-answer {
      display: block;
      border-top-color: #f1f5f9;
    }

    /* 需求匹配与联系我们表单 */
    .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-side {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-channels {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin: 24px 0;
    }

    .channel-item {
      display: flex;
      align-items: center;
      gap: 14px;
      font-size: 0.95rem;
      color: var(--text-secondary);
    }

    .channel-icon {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 700;
    }

    .qrcode-box {
      margin-top: 10px;
      background: #f8fafc;
      padding: 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      display: inline-block;
      max-width: 220px;
    }

    .qrcode-box img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: 4px;
    }

    .qrcode-desc {
      font-size: 0.8rem;
      text-align: center;
      color: var(--text-muted);
      margin-top: 8px;
    }

    .contact-form-side form {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

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

    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background: #ffffff;
      outline: none;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }

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

    /* 行业资讯与短代码文章 */
    .article-module-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .article-link-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-link-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 16px;
      background: #f8fafc;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
      border: 1px solid transparent;
    }

    .article-link-item:hover {
      background: #ffffff;
      border-color: #cbd5e1;
      box-shadow: var(--shadow-sm);
      color: var(--primary);
    }

    /* 友情链接与页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 48px 0 24px;
      color: var(--text-secondary);
      font-size: 0.9rem;
    }

    .footer-top-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 36px;
    }

    .footer-brand h4 {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .footer-links-col h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .footer-links-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-friend-links {
      border-top: 1px solid #f1f5f9;
      padding: 20px 0;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 0.85rem;
    }

    .footer-friend-links span {
      font-weight: 700;
      color: var(--text-main);
    }

    .footer-friend-links a {
      color: var(--text-secondary);
    }

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

    .footer-bottom {
      border-top: 1px solid #f1f5f9;
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 浮动客服小部件 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .widget-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--text-main);
      transition: all 0.2s ease;
      font-weight: 700;
      font-size: 0.85rem;
    }

    .widget-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-2px);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .about-cards-grid,
      .scenarios-grid,
      .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .workflow-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 2.1rem;
      }
      .about-cards-grid,
      .scenarios-grid,
      .testimonials-grid,
      .case-gallery-grid {
        grid-template-columns: 1fr;
      }
      .workflow-timeline {
        grid-template-columns: 1fr;
      }
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
    }