/* 基础重置与艳红热烈主题变量定义 */
    :root {
      --primary: #d32f2f;
      --primary-hover: #b71c1c;
      --primary-light: #ffebee;
      --primary-accent: #ff5252;
      --secondary: #e65100;
      --text-main: #1f2429;
      --text-sub: #555b63;
      --text-light: #7b838e;
      --bg-page: #fbf9f9;
      --bg-card: #ffffff;
      --border-color: #f0d5d5;
      --shadow-sm: 0 2px 8px rgba(211, 47, 47, 0.06);
      --shadow-md: 0 8px 24px rgba(211, 47, 47, 0.1);
      --shadow-lg: 0 16px 36px rgba(183, 28, 28, 0.14);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --transition: all 0.28s ease;
      --max-width: 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;
    }

    /* 统一标准容器 */
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
    }

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

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      color: var(--text-main);
      font-weight: 500;
      text-decoration: none;
      font-size: 0.92rem;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      display: inline-block;
    }

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

    .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);
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
      line-height: 1.4;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(211, 47, 47, 0.35);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover) 0%, #8e0000 100%);
      box-shadow: 0 6px 20px rgba(211, 47, 47, 0.45);
      transform: translateY(-2px);
    }

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

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

    .mobile-toggle {
      display: none;
      flex-direction: column;
      justify-content: space-around;
      width: 30px;
      height: 24px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 0;
    }

    .mobile-toggle span {
      width: 100%;
      height: 3px;
      background-color: var(--text-main);
      border-radius: 2px;
      transition: var(--transition);
    }

    /* 首屏 Hero 区域（坚决不包含任何图片） */
    .hero-section {
      padding: 90px 0 80px;
      background: radial-gradient(circle at 80% 20%, #ffebee 0%, #fff5f5 45%, #ffffff 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }

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

    .hero-badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 16px;
      background: var(--primary-light);
      border: 1px solid rgba(211, 47, 47, 0.2);
      border-radius: 30px;
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 700;
      margin-bottom: 24px;
      letter-spacing: 0.5px;
    }

    .hero-title {
      font-size: 2.6rem;
      font-weight: 900;
      line-height: 1.25;
      color: #1a1a1a;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      color: var(--primary);
      position: relative;
      display: inline-block;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-sub);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .hero-stats-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
      text-align: left;
    }

    .hero-stat-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-top: 3px solid var(--primary);
      padding: 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .hero-stat-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .hero-stat-num {
      font-size: 1.75rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 4px;
    }

    .hero-stat-label {
      font-size: 0.88rem;
      color: var(--text-sub);
      font-weight: 500;
    }

    /* 模块通用样式 */
    .section-block {
      padding: 85px 0;
      position: relative;
    }

    .section-block.alt-bg {
      background-color: #fff9f9;
      border-top: 1px solid rgba(211, 47, 47, 0.08);
      border-bottom: 1px solid rgba(211, 47, 47, 0.08);
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-eyebrow {
      color: var(--primary);
      font-size: 0.88rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-sub);
      line-height: 1.65;
    }

    /* 平台支持模型标签滚动墙 */
    .models-tag-matrix {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid #ffd5d5;
      color: #931919;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.82rem;
      font-weight: 600;
      box-shadow: 0 1px 3px rgba(0,0,0,0.02);
      transition: var(--transition);
    }

    .model-tag:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: translateY(-2px);
    }

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

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
      align-items: center;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid #f5dede;
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

    .feature-icon-box {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      margin-bottom: 20px;
      font-weight: bold;
    }

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

    .feature-card p {
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.6;
      flex-grow: 1;
    }

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

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

    .step-badge {
      display: inline-block;
      background: var(--primary);
      color: #ffffff;
      font-weight: 800;
      font-size: 0.85rem;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
    }

    .process-step h4 {
      font-size: 1.1rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .process-step p {
      font-size: 0.88rem;
      color: var(--text-sub);
      line-height: 1.55;
    }

    /* 对比评测表格与评级区 */
    .review-score-banner {
      background: linear-gradient(135deg, #b71c1c 0%, #d32f2f 100%);
      color: #ffffff;
      border-radius: var(--radius-md);
      padding: 30px;
      margin-bottom: 35px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      box-shadow: var(--shadow-md);
    }

    .score-left h3 {
      font-size: 1.6rem;
      margin-bottom: 6px;
    }

    .score-left p {
      color: #ffcdd2;
      font-size: 0.95rem;
    }

    .score-right {
      display: flex;
      align-items: center;
      gap: 24px;
    }

    .rating-val {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1;
      color: #ffffff;
    }

    .rating-meta {
      font-size: 0.9rem;
      color: #ffebee;
    }

    .star-display {
      color: #ffeb3b;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }

    .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;
      min-width: 680px;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f5dede;
      font-size: 0.92rem;
    }

    .compare-table th {
      background-color: #fff2f2;
      font-weight: 700;
      color: #8e1717;
    }

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

    .highlight-cell {
      color: var(--primary);
      font-weight: 700;
      background-color: rgba(211, 47, 47, 0.03);
    }

    /* 案例展示区（展示素材图） */
    .case-gallery-grid {
      display: grid;
      grid-template-columns: repeat(3, 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);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

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

    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 10;
      overflow: hidden;
      background: #f0f0f0;
    }

    .case-img-wrap.square-ratio {
      aspect-ratio: 1 / 1;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.5s ease;
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.05);
    }

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

    .case-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      margin-bottom: 6px;
      display: block;
    }

    .case-body h4 {
      font-size: 1.15rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .case-body p {
      font-size: 0.88rem;
      color: var(--text-sub);
      line-height: 1.5;
    }

    /* 用户评论卡片 (6条真实评论) */
    .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: 26px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .testimonial-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }

    .user-avatar-badge {
      width: 44px;
      height: 44px;
      background: var(--primary-light);
      color: var(--primary);
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
    }

    .user-info h4 {
      font-size: 1rem;
      color: var(--text-main);
      margin-bottom: 2px;
    }

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

    .testimonial-text {
      font-size: 0.9rem;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 最新文章列表模块 */
    .articles-section-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }

    .article-links-row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
      padding-top: 16px;
      border-top: 1px dashed var(--border-color);
    }

    .article-links-row a {
      font-size: 0.88rem;
      color: var(--primary);
      text-decoration: none;
      background: var(--primary-light);
      padding: 4px 12px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }

    .article-links-row a:hover {
      background: var(--primary);
      color: #ffffff;
    }

    /* 需求匹配与联系我们表单 */
    .form-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #dcdfe6;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition);
      background-color: #fafafa;
    }

    .form-control:focus {
      border-color: var(--primary);
      background-color: #ffffff;
      box-shadow: 0 0 0 3px rgba(211, 47, 47, 0.12);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 120px;
    }

    .contact-info-card {
      background: linear-gradient(135deg, #b71c1c 0%, #d32f2f 100%);
      color: #ffffff;
      padding: 40px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
    }

    .contact-info-card h3 {
      font-size: 1.6rem;
      margin-bottom: 16px;
    }

    .contact-info-card p {
      color: #ffcdd2;
      font-size: 0.95rem;
      line-height: 1.7;
      margin-bottom: 24px;
    }

    .contact-list {
      list-style: none;
      margin-bottom: 30px;
    }

    .contact-list li {
      margin-bottom: 14px;
      font-size: 0.95rem;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .qr-box {
      background: #ffffff;
      padding: 16px;
      border-radius: var(--radius-md);
      display: inline-block;
      text-align: center;
      max-width: 170px;
    }

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

    .qr-box span {
      font-size: 0.8rem;
      color: var(--text-main);
      font-weight: 600;
    }

    /* FAQ 折叠面板 */
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
      transition: var(--transition);
    }

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

    .faq-question {
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      font-size: 1.02rem;
      user-select: none;
    }

    .faq-icon {
      font-size: 1.3rem;
      color: var(--primary);
      transition: transform 0.3s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background: #fffafa;
      color: var(--text-sub);
      font-size: 0.93rem;
      line-height: 1.65;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 18px;
    }

    /* 友情链接与底部 */
    .friend-links-wrap {
      padding: 24px 0;
      background: #fdf5f5;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .friend-links-inner {
      display: flex;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
    }

    .friend-links-title {
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--primary);
    }

    .friend-links-inner a {
      color: var(--text-sub);
      text-decoration: none;
      font-size: 0.85rem;
      transition: var(--transition);
    }

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

    .site-footer {
      background-color: #ffffff;
      color: var(--text-sub);
      padding: 40px 0 30px;
      border-top: 1px solid var(--border-color);
    }

    .footer-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

    .footer-left p {
      font-size: 0.88rem;
      color: var(--text-light);
    }

    .footer-links {
      display: flex;
      gap: 20px;
    }

    .footer-links a {
      color: var(--text-sub);
      text-decoration: none;
      font-size: 0.88rem;
      transition: var(--transition);
    }

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

    /* 浮动客服入口 */
    .floating-contact {
      position: fixed;
      right: 24px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      box-shadow: 0 4px 12px rgba(211, 47, 47, 0.4);
      cursor: pointer;
      transition: var(--transition);
      position: relative;
    }

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

    .float-tooltip {
      position: absolute;
      right: 60px;
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      padding: 10px;
      border-radius: var(--radius-sm);
      white-space: nowrap;
      box-shadow: var(--shadow-md);
      display: none;
      font-size: 0.85rem;
    }

    .float-btn:hover .float-tooltip {
      display: block;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.1rem;
      }
      .grid-4, .hero-stats-row, .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .testimonials-grid, .case-gallery-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-2 {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-toggle {
        display: flex;
      }
      .nav-links {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 8px 16px rgba(0,0,0,0.08);
        display: none;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 12px 16px;
        width: 100%;
      }
      .hero-section {
        padding: 50px 0;
      }
      .hero-title {
        font-size: 1.75rem;
      }
      .grid-4, .hero-stats-row, .process-timeline, .grid-3, .testimonials-grid, .case-gallery-grid {
        grid-template-columns: 1fr;
      }
      .form-box, .contact-info-card {
        padding: 24px;
      }
      .review-score-banner {
        flex-direction: column;
        align-items: flex-start;
      }
    }