:root {
      --primary-red: #d32f2f;
      --primary-red-hover: #b71c1c;
      --accent-gold: #e65100;
      --accent-warm: #fff5f5;
      --bg-page: #fcfcfc;
      --bg-card: #ffffff;
      --text-main: #212121;
      --text-muted: #616161;
      --border-color: #f0d5d5;
      --border-strong: #e0b4b4;
      --shadow-sm: 0 2px 8px rgba(211, 47, 47, 0.06);
      --shadow-md: 0 6px 20px rgba(211, 47, 47, 0.1);
      --container-width: 1200px;
      --transition: all 0.25s ease-in-out;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
    }
    body {
      overflow-x: hidden;
      background: radial-gradient(circle at top, #fff8f8 0%, #fdfdfd 100%);
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    ul, ol {
      list-style: none;
    }
    .container {
      width: 100%;
      max-width: var(--container-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航栏 */
    .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);
      box-shadow: var(--shadow-sm);
    }
    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-box .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }
    .brand-name {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-red);
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }
    .nav-links a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 15px;
      color: var(--text-main);
      font-weight: 500;
      border-radius: 4px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-red);
      background-color: var(--accent-warm);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 15px;
      font-weight: 600;
      border-radius: 6px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
    }
    .btn-primary {
      background-color: var(--primary-red);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(211, 47, 47, 0.25);
    }
    .btn-primary:hover {
      background-color: var(--primary-red-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(211, 47, 47, 0.35);
      color: #ffffff;
    }
    .btn-outline {
      border-color: var(--primary-red);
      color: var(--primary-red);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--accent-warm);
      transform: translateY(-2px);
    }
    .nav-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 区域通用样式 */
    .section-padding {
      padding: 72px 0;
      border-bottom: 1px solid #f5eeee;
    }
    .section-head {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 48px auto;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background-color: var(--accent-warm);
      color: var(--primary-red);
      font-size: 13px;
      font-weight: 600;
      border-radius: 20px;
      border: 1px solid var(--border-color);
      margin-bottom: 12px;
      text-transform: uppercase;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: #1a1a1a;
      line-height: 1.35;
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 首屏 Hero (严禁包含图片) */
    .hero-section {
      padding: 90px 0 80px 0;
      background: linear-gradient(180deg, #fff2f2 0%, #ffffff 100%);
      position: relative;
    }
    .hero-content {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }
    .hero-tagline {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffebeb;
      border: 1px solid #f8caca;
      color: var(--primary-red);
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 800;
      color: #111111;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      color: var(--primary-red);
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 36px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-cta-group {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }
    .btn-large {
      padding: 14px 34px;
      font-size: 17px;
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }
    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 24px 16px;
      border-radius: 12px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-red);
    }
    .stat-value {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary-red);
      line-height: 1.1;
      margin-bottom: 8px;
    }
    .stat-label {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台矩阵标签条 */
    .model-strip {
      background: #ffffff;
      padding: 24px 0;
      border-bottom: 1px solid #f0e0e0;
    }
    .model-strip-inner {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }
    .model-chip {
      padding: 6px 14px;
      background: #fbf5f5;
      border: 1px solid #f5dcdc;
      color: #4a4a4a;
      font-size: 13px;
      font-weight: 500;
      border-radius: 6px;
      transition: var(--transition);
    }
    .model-chip:hover {
      border-color: var(--primary-red);
      color: var(--primary-red);
      background: var(--accent-warm);
    }

    /* 平台介绍 & 特性 */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 30px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-red);
    }
    .feature-card h3 {
      font-size: 19px;
      margin-bottom: 12px;
      color: #1a1a1a;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 场景卡片大网格 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .scenario-card {
      background: #ffffff;
      border: 1px solid #f2e2e2;
      border-radius: 12px;
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }
    .scenario-card:hover {
      border-color: var(--primary-red);
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }
    .scenario-card-head {
      margin-bottom: 12px;
    }
    .scenario-tag {
      display: inline-block;
      font-size: 12px;
      padding: 2px 8px;
      background: #fff0f0;
      color: var(--primary-red);
      border-radius: 4px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .scenario-card h3 {
      font-size: 18px;
      color: #1a1a1a;
      margin-bottom: 8px;
    }
    .scenario-card p {
      font-size: 14px;
      color: #555555;
      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;
      margin-top: 10px;
    }
    .timeline-step {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 28px 20px;
      text-align: center;
      position: relative;
    }
    .step-number {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-red);
      color: #ffffff;
      font-size: 18px;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px auto;
    }
    .timeline-step h3 {
      font-size: 17px;
      margin-bottom: 10px;
    }
    .timeline-step p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 案例中心展示图 */
    .media-card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-bottom: 30px;
    }
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .media-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .media-box {
      width: 100%;
      aspect-ratio: 16 / 10;
      background: #fafafa;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
      border-bottom: 1px solid #f5eeee;
    }
    .media-box.square-box {
      aspect-ratio: 1 / 1;
    }
    .media-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .media-card:hover .media-box img {
      transform: scale(1.04);
    }
    .media-info {
      padding: 18px 20px;
    }
    .media-info h3 {
      font-size: 16px;
      margin-bottom: 6px;
      color: #222;
    }
    .media-info p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 对比评测卡与表格 */
    .review-highlight {
      background: linear-gradient(135deg, #fff5f5 0%, #ffffff 100%);
      border: 2px solid var(--primary-red);
      border-radius: 12px;
      padding: 30px;
      text-align: center;
      margin-bottom: 36px;
    }
    .review-score {
      font-size: 52px;
      font-weight: 900;
      color: var(--primary-red);
      line-height: 1;
    }
    .review-stars {
      color: #f59e0b;
      font-size: 24px;
      margin: 8px 0;
    }
    .comparison-table-wrap {
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      box-shadow: var(--shadow-sm);
    }
    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .comparison-table th, 
    .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f0e6e6;
      font-size: 14px;
    }
    .comparison-table th {
      background: #fff8f8;
      color: #333333;
      font-weight: 600;
    }
    .comparison-table tr:last-child td {
      border-bottom: none;
    }
    .highlight-col {
      background: #fffdfd;
      color: var(--primary-red);
      font-weight: 600;
    }

    /* 用户评论 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-body {
      font-size: 14px;
      color: #444444;
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed #f0dcdc;
      padding-top: 14px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #fee2e2;
      color: var(--primary-red);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
    }
    .author-info h4 {
      font-size: 15px;
      color: #222;
    }
    .author-info span {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-question {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      background: none;
      border: none;
      font-size: 16px;
      font-weight: 600;
      color: #222;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-question:hover {
      color: var(--primary-red);
    }
    .faq-icon {
      font-size: 18px;
      color: var(--primary-red);
      transition: transform 0.25s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #fffdfd;
      padding: 0 24px;
      font-size: 14px;
      color: #555;
      line-height: 1.6;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 12px 24px 20px 24px;
      border-top: 1px solid #f8eaea;
    }

    /* 表单与联系区 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
    }
    .contact-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }
    .contact-card h3 {
      font-size: 20px;
      margin-bottom: 16px;
      color: #222;
    }
    .contact-item {
      margin-bottom: 14px;
      font-size: 15px;
      color: #444;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .qr-box {
      margin-top: 20px;
      padding: 16px;
      background: #fff8f8;
      border: 1px solid #fed7d7;
      border-radius: 8px;
      display: inline-block;
      text-align: center;
    }
    .qr-box img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      display: block;
      margin: 0 auto 8px auto;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 6px;
      color: #333;
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #dcdcdc;
      border-radius: 6px;
      font-size: 14px;
      transition: var(--transition);
      background: #fafafa;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary-red);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(211, 47, 47, 0.1);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* 行业资讯 & 最新文章 */
    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-top: 20px;
    }
    .article-card-link {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 18px 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition);
    }
    .article-card-link:hover {
      border-color: var(--primary-red);
      background: var(--accent-warm);
      transform: translateX(4px);
    }
    .article-card-link span {
      font-size: 15px;
      font-weight: 500;
      color: #333;
    }
    .article-card-link .arrow {
      color: var(--primary-red);
      font-weight: bold;
    }

    /* 友情链接与页脚 */
    .footer-section {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 24px 0;
      color: var(--text-muted);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 36px;
    }
    .footer-col h4 {
      font-size: 16px;
      font-weight: 700;
      color: #222;
      margin-bottom: 16px;
    }
    .footer-links-inline {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .footer-links-inline a {
      color: var(--text-muted);
      font-size: 14px;
    }
    .footer-links-inline a:hover {
      color: var(--primary-red);
    }
    .footer-bottom {
      border-top: 1px solid #f0e6e6;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #777;
    }

    /* 悬浮客服面板 */
    .floating-service {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary-red);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(211, 47, 47, 0.4);
      cursor: pointer;
      position: relative;
      transition: var(--transition);
      border: none;
      font-size: 20px;
    }
    .float-btn:hover {
      transform: scale(1.08);
      background: var(--primary-red-hover);
    }
    .float-qr-pop {
      display: none;
      position: absolute;
      right: 56px;
      bottom: 0;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 12px;
      box-shadow: var(--shadow-md);
      text-align: center;
      width: 150px;
    }
    .float-qr-pop img {
      width: 120px;
      height: 120px;
      display: block;
      margin: 0 auto 6px auto;
    }
    .float-btn:hover .float-qr-pop {
      display: block;
    }

    /* 响应式样式规范 */
    @media (max-width: 1024px) {
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .scenario-grid,
      .feature-grid,
      .media-card-grid,
      .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .workflow-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-grid,
      .footer-grid {
        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: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .nav-toggle {
        display: block;
      }
      .hero-title {
        font-size: 28px;
      }
      .section-title {
        font-size: 24px;
      }
      .hero-stats-grid,
      .scenario-grid,
      .feature-grid,
      .media-card-grid,
      .testimonial-grid,
      .workflow-timeline,
      .article-links-grid {
        grid-template-columns: 1fr;
      }
      .hero-cta-group {
        flex-direction: column;
      }
      .btn-large {
        width: 100%;
      }
    }