:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --secondary: #06b6d4;
      --accent-coral: #ff5757;
      --accent-yellow: #ffb703;
      --accent-purple: #8b5cf6;
      --bg-base: #fafbff;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-sub: #64748b;
      --border-light: #e2e8f0;
      --border-hover: #cbd5e1;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 10px 15px -3px rgba(79, 70, 229, 0.08), 0 4px 6px -4px rgba(79, 70, 229, 0.04);
      --shadow-lg: 0 20px 25px -5px rgba(79, 70, 229, 0.12), 0 8px 10px -6px rgba(79, 70, 229, 0.06);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-width: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

    ul, ol {
      list-style: none;
    }

    .container {
      width: 100%;
      max-width: var(--container-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }
    .nav-brand {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .logo-container {
      display: flex;
      align-items: center;
      max-width: 160px;
      height: 44px;
    }
    .ai-page-logo {
      max-height: 44px;
      width: auto;
      object-fit: contain;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-muted);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }
    .nav-links a:hover {
      color: var(--primary);
      background: rgba(79, 70, 229, 0.05);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-gradient {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent-purple) 100%);
      color: #ffffff !important;
      padding: 10px 22px;
      border-radius: 50px;
      font-size: 14px;
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.35);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }
    .btn-gradient:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .mobile-menu-btn span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: 0.3s;
    }

    /* 首屏 Hero 区 - 纯几何与动效，无图片 */
    .hero-section {
      padding: 90px 0 70px;
      position: relative;
      background: radial-gradient(circle at 10% 20%, rgba(79, 70, 229, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(6, 182, 212, 0.08) 0%, transparent 40%),
                  #ffffff;
      border-bottom: 1px solid var(--border-light);
    }
    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: linear-gradient(90deg, rgba(79, 70, 229, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
      border: 1px solid rgba(79, 70, 229, 0.2);
      border-radius: 50px;
      font-size: 13px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 44px;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 22px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .btn-hero-main {
      background: linear-gradient(135deg, #ff5757 0%, #ff8c42 100%);
      color: #ffffff !important;
      padding: 15px 36px;
      font-size: 16px;
      font-weight: 700;
      border-radius: 50px;
      box-shadow: 0 8px 24px rgba(255, 87, 87, 0.35);
      transition: all 0.25s ease;
    }
    .btn-hero-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(255, 87, 87, 0.45);
    }
    .btn-hero-secondary {
      background: #ffffff;
      color: var(--text-main);
      padding: 15px 34px;
      font-size: 16px;
      font-weight: 600;
      border-radius: 50px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }
    .btn-hero-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    /* 品牌指标栏 */
    .metric-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }
    .metric-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s ease;
    }
    .metric-card:hover {
      transform: translateY(-4px);
    }
    .metric-value {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 通用区块头 */
    .section-wrap {
      padding: 80px 0;
    }
    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 50px;
    }
    .section-tag {
      font-size: 13px;
      font-weight: 700;
      color: var(--secondary);
      text-transform: uppercase;
      letter-spacing: 1.5px;
      margin-bottom: 10px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 模型矩阵徽章云 */
    .model-pills {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 30px;
    }
    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border-light);
      padding: 8px 18px;
      border-radius: 50px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-muted);
      box-shadow: var(--shadow-sm);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: all 0.2s ease;
    }
    .model-pill::before {
      content: "";
      width: 7px;
      height: 7px;
      background: var(--accent-coral);
      border-radius: 50%;
    }
    .model-pill:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    /* 服务能力卡片网格 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }
    .service-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }
    .service-card::after {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 4px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
      opacity: 0;
      transition: opacity 0.3s ease;
    }
    .service-card:hover::after {
      opacity: 1;
    }
    .service-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(79, 70, 229, 0.08);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 20px;
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 一站式制作场景 */
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .scene-box {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s ease, border-color 0.2s ease;
    }
    .scene-box:hover {
      transform: translateY(-3px);
      border-color: var(--secondary);
    }
    .scene-box h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .scene-box h4 span {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 2px;
    }
    .scene-box p {
      font-size: 13px;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 标准流程 4 步 */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .step-number {
      font-size: 36px;
      font-weight: 900;
      color: rgba(79, 70, 229, 0.15);
      position: absolute;
      top: 16px;
      right: 20px;
      line-height: 1;
    }
    .step-card h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .step-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 案例图片展示区 */
    .case-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
      align-items: stretch;
    }
    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      display: flex;
      flex-direction: column;
    }
    .case-img-wrap {
      width: 100%;
      background: #f1f5f9;
      aspect-ratio: 16 / 9;
      overflow: hidden;
    }
    .case-img-wrap.square {
      aspect-ratio: 1 / 1;
      max-height: 380px;
    }
    .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-info {
      padding: 24px;
      flex-grow: 1;
    }
    .case-info h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .case-info p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 对比评测卡片与表格 */
    .eval-box {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
      margin-bottom: 30px;
    }
    .eval-summary {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 24px;
    }
    .eval-score-wrap {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .eval-score-num {
      font-size: 52px;
      font-weight: 900;
      color: var(--accent-coral);
      line-height: 1;
    }
    .eval-score-text h4 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
    }
    .eval-score-text p {
      font-size: 14px;
      color: var(--text-sub);
    }
    .eval-tag {
      background: #fef2f2;
      border: 1px solid #fecaca;
      color: #dc2626;
      padding: 8px 18px;
      border-radius: 50px;
      font-size: 14px;
      font-weight: 700;
    }
    .table-responsive {
      width: 100%;
      overflow-x: auto;
    }
    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }
    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-light);
    }
    .eval-table th {
      background: #f8fafc;
      color: var(--text-main);
      font-weight: 700;
    }
    .eval-table td.highlight {
      font-weight: 700;
      color: var(--primary);
      background: rgba(79, 70, 229, 0.02);
    }

    /* 客户评价 6 条 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-light);
      padding-top: 14px;
    }
    .user-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--secondary), var(--primary));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
    }
    .user-meta h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }
    .user-meta span {
      font-size: 12px;
      color: var(--text-sub);
    }

    /* FAQ 手风琴 */
    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      overflow: hidden;
      transition: border-color 0.2s ease;
    }
    .faq-item:hover {
      border-color: var(--primary);
    }
    .faq-btn {
      width: 100%;
      padding: 20px 24px;
      text-align: left;
      background: none;
      border: none;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-icon {
      font-size: 20px;
      color: var(--primary);
      transition: transform 0.2s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-body {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      display: none;
    }
    .faq-item.active .faq-body {
      display: block;
    }

    /* 需求匹配与表单 */
    .form-container {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      max-width: 760px;
      margin: 0 auto;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--text-main);
      background: #f8fafc;
      outline: none;
      transition: border-color 0.2s ease;
    }
    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* 宣传与推广横幅 Banner */
    .promo-banner {
      background: linear-gradient(135deg, rgba(79, 70, 229, 0.05) 0%, rgba(6, 182, 212, 0.05) 100%);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 40px;
      margin: 40px 0;
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .promo-banner-text {
      flex: 1;
    }
    .promo-banner-text h3 {
      font-size: 24px;
      font-weight: 800;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .promo-banner-text p {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .promo-banner-img {
      flex: 1;
      max-width: 480px;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .promo-banner-img img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* 文章列表 */
    .article-links-box {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      margin-top: 30px;
    }
    .article-links-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }
    .article-item-link {
      background: #f1f5f9;
      padding: 8px 16px;
      border-radius: var(--radius-sm);
      font-size: 13px;
      color: var(--text-muted);
      transition: all 0.2s ease;
    }
    .article-item-link:hover {
      background: var(--primary);
      color: #ffffff;
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #e2e8f0;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-col p {
      font-size: 14px;
      color: #94a3b8;
      line-height: 1.7;
      margin-bottom: 12px;
    }
    .footer-col ul li {
      margin-bottom: 10px;
    }
    .footer-col ul li a {
      font-size: 14px;
      color: #94a3b8;
    }
    .footer-col ul li a:hover {
      color: #ffffff;
    }
    .qr-container {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 10px;
    }
    .qr-box {
      width: 110px;
      height: 110px;
      background: #ffffff;
      padding: 6px;
      border-radius: var(--radius-sm);
    }
    .qr-box img {
      width: 100%;
      height: 100%;
      object-fit: contain;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #64748b;
    }

    /* 友情链接与文章栏 */
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
      margin-top: 16px;
    }
    .friend-links a {
      font-size: 13px;
      color: #94a3b8;
      background: #1e293b;
      padding: 4px 12px;
      border-radius: 4px;
    }
    .friend-links a:hover {
      color: #ffffff;
      background: var(--primary);
    }

    /* 浮动客服入口 */
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 18px;
      cursor: pointer;
      transition: all 0.2s ease;
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.08);
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .metric-grid, .service-grid, .flow-steps, .scene-grid, .review-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-container {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .promo-banner {
        flex-direction: column;
      }
      .promo-banner-img {
        max-width: 100%;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 74px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-light);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 30px;
      }
      .metric-grid, .service-grid, .flow-steps, .scene-grid, .review-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .form-container {
        padding: 24px;
      }
    }