:root {
      --primary-red: #d32f2f;
      --deep-red: #9a0007;
      --bright-red: #ff3d00;
      --soft-red: #fff5f5;
      --accent-gold: #ffb300;
      --text-dark: #1f1f1f;
      --text-muted: #555555;
      --bg-light: #faf8f8;
      --bg-white: #ffffff;
      --border-color: #f0d0d0;
      --card-shadow: 0 10px 30px rgba(180, 20, 20, 0.08);
      --card-hover-shadow: 0 16px 36px rgba(180, 20, 20, 0.16);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --container-width: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    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-dark);
      line-height: 1.6;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

    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;
    }

    /* 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 12px rgba(211, 47, 47, 0.05);
    }

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

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

    .brand-area .logo-wrapper {
      max-width: 150px;
      display: flex;
      align-items: center;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-dark);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
    }

    .nav-links a:hover {
      color: var(--primary-red);
      background-color: var(--soft-red);
    }

    .header-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: 30px;
      cursor: pointer;
      transition: all 0.3s cubic-bezier(0.165, 0.84, 0.44, 1);
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--bright-red) 0%, var(--primary-red) 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 15px rgba(211, 47, 47, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 22px rgba(211, 47, 47, 0.45);
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--primary-red) !important;
      border-color: var(--primary-red);
    }

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

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

    /* 模块通用样式 */
    .section-wrap {
      padding: 70px 0;
      position: relative;
    }

    .section-alt {
      background: #ffffff;
      border-top: 1px solid #f6e6e6;
      border-bottom: 1px solid #f6e6e6;
    }

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

    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      color: var(--primary-red);
      background: var(--soft-red);
      padding: 4px 14px;
      border-radius: 20px;
      border: 1px solid var(--border-color);
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-dark);
      margin-bottom: 14px;
      line-height: 1.3;
    }

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

    /* 首屏 Hero 无图片纯技术美感设计 */
    .hero-section {
      padding: 85px 0 65px;
      background: radial-gradient(circle at 80% 20%, #ffebeb 0%, #faf8f8 65%);
      position: relative;
      overflow: hidden;
    }

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

    .hero-content h1 {
      font-size: 40px;
      line-height: 1.25;
      font-weight: 900;
      color: var(--deep-red);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-lead {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 30px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 40px;
    }

    .hero-stats-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 15px;
      border-top: 1px dashed var(--border-color);
      padding-top: 25px;
    }

    .stat-badge {
      font-size: 14px;
      color: var(--text-muted);
    }

    .stat-badge strong {
      display: block;
      font-size: 24px;
      font-weight: 800;
      color: var(--primary-red);
      line-height: 1.2;
    }

    /* Hero 右侧动态仪表交互板 (不含图片) */
    .hero-dashboard-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: 0 20px 45px rgba(211, 47, 47, 0.12);
      position: relative;
    }

    .dash-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-bottom: 1px solid #fce8e8;
      padding-bottom: 15px;
      margin-bottom: 20px;
    }

    .dash-status {
      font-size: 13px;
      font-weight: 700;
      color: var(--primary-red);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .dash-status::before {
      content: "";
      width: 8px;
      height: 8px;
      background: var(--bright-red);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--bright-red);
    }

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

    .cluster-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 10px 14px;
      background: var(--soft-red);
      border-radius: var(--radius-sm);
      border: 1px solid #f8dede;
      font-size: 14px;
    }

    .cluster-name {
      font-weight: 700;
      color: var(--deep-red);
    }

    .cluster-tag {
      font-size: 12px;
      background: #fff;
      color: var(--primary-red);
      padding: 2px 8px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
    }

    /* 模型矩阵与胶囊标签 */
    .model-pills-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .model-pill {
      font-size: 13px;
      font-weight: 600;
      color: var(--deep-red);
      background: #fff;
      padding: 8px 16px;
      border-radius: 20px;
      border: 1px solid var(--border-color);
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
      transition: all 0.2s ease;
    }

    .model-pill:hover {
      background: var(--primary-red);
      color: #fff;
      transform: translateY(-2px);
    }

    /* 卡片网格布局 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 25px;
    }

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

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--card-shadow);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-hover-shadow);
    }

    .feature-card h3 {
      font-size: 20px;
      font-weight: 700;
      color: var(--deep-red);
      margin-bottom: 12px;
    }

    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .badge-sub {
      display: inline-block;
      font-size: 12px;
      color: var(--bright-red);
      background: var(--soft-red);
      padding: 3px 10px;
      border-radius: 4px;
      font-weight: 600;
      width: fit-content;
    }

    /* 视觉素材卡片与图文区 */
    .media-card {
      background: #fff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }

    .media-card .img-box {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #eee;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .media-card .img-box-square {
      aspect-ratio: 1 / 1;
    }

    .media-card img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

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

    .media-content {
      padding: 20px;
    }

    .media-content h4 {
      font-size: 18px;
      font-weight: 700;
      color: var(--deep-red);
      margin-bottom: 8px;
    }

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

    /* 标准流程时间线 */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-item {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 44px;
      height: 44px;
      line-height: 44px;
      background: var(--primary-red);
      color: #fff;
      font-size: 18px;
      font-weight: 800;
      border-radius: 50%;
      margin: 0 auto 16px auto;
      box-shadow: 0 4px 10px rgba(211, 47, 47, 0.3);
    }

    .step-item h4 {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }

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

    /* 对比评测卡片与表格 */
    .review-score-banner {
      background: linear-gradient(135deg, #fff7f7 0%, #ffe9e9 100%);
      border: 2px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 35px;
    }

    .score-left h3 {
      font-size: 26px;
      font-weight: 800;
      color: var(--deep-red);
      margin-bottom: 8px;
    }

    .stars-render {
      color: var(--accent-gold);
      font-size: 22px;
      margin-right: 10px;
    }

    .score-badge {
      background: var(--primary-red);
      color: #fff;
      font-size: 28px;
      font-weight: 900;
      padding: 10px 24px;
      border-radius: 40px;
      box-shadow: 0 6px 18px rgba(211, 47, 47, 0.3);
    }

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

    .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 #f6dede;
      font-size: 14px;
    }

    .compare-table th {
      background: var(--soft-red);
      color: var(--deep-red);
      font-weight: 700;
    }

    .highlight-col {
      background: #fffafa;
      color: var(--primary-red);
      font-weight: 700;
    }

    /* 需求表单模块 */
    .form-wrapper {
      max-width: 780px;
      margin: 0 auto;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--card-shadow);
    }

    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
      margin-bottom: 20px;
    }

    .form-group label {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-dark);
    }

    .form-group input, 
    .form-group select, 
    .form-group textarea {
      width: 100%;
      padding: 12px 16px;
      font-size: 14px;
      border: 1px solid #e0c8c8;
      border-radius: var(--radius-sm);
      background: #fdfbfb;
      outline: none;
      transition: border-color 0.25s;
    }

    .form-group input:focus, 
    .form-group select:focus, 
    .form-group textarea:focus {
      border-color: var(--primary-red);
      background: #fff;
    }

    /* 折叠面板 (FAQ) */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 15px;
    }

    .faq-item {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
    }

    .faq-question {
      padding: 18px 22px;
      font-size: 16px;
      font-weight: 700;
      color: var(--deep-red);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-question::after {
      content: "+";
      font-size: 20px;
      font-weight: 400;
      transition: transform 0.3s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #fffcfc;
      padding: 0 22px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 250px;
      padding: 12px 22px 20px 22px;
      border-top: 1px solid #fae8e8;
    }

    /* 客户评价网格 */
    .comment-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--card-shadow);
    }

    .comment-card p {
      font-size: 14px;
      color: var(--text-dark);
      line-height: 1.6;
      margin-bottom: 20px;
      font-style: italic;
    }

    .comment-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f6dede;
      padding-top: 15px;
    }

    .avatar-icon {
      width: 40px;
      height: 40px;
      background: var(--soft-red);
      color: var(--primary-red);
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--border-color);
    }

    .author-info h5 {
      font-size: 14px;
      font-weight: 700;
      color: var(--deep-red);
    }

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

    /* 文章及知识条目 */
    .article-list {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-item {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      transition: all 0.25s ease;
    }

    .article-item:hover {
      border-color: var(--primary-red);
      transform: translateY(-3px);
    }

    .article-item h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-dark);
    }

    .article-item a {
      color: var(--primary-red);
      font-size: 13px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 联系我们与二维码 */
    .contact-card-wrap {
      display: grid;
      grid-template-columns: 1fr 1.5fr;
      gap: 40px;
      align-items: center;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--card-shadow);
    }

    .qr-side {
      text-align: center;
      padding: 20px;
      background: var(--soft-red);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .qr-side img {
      max-width: 170px;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      border: 2px solid #fff;
    }

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 15px;
    }

    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 15px;
    }

    .contact-label {
      font-weight: 700;
      color: var(--deep-red);
      min-width: 90px;
    }

    /* 页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px 0;
      color: var(--text-dark);
    }

    .footer-top {
      display: grid;
      grid-template-columns: 1.8fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      font-size: 16px;
      font-weight: 700;
      color: var(--deep-red);
      margin-bottom: 18px;
    }

    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a {
      font-size: 13px;
      color: var(--text-muted);
    }

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

    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .friend-links-wrap a {
      font-size: 12px;
      background: var(--soft-red);
      color: var(--deep-red);
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid var(--border-color);
    }

    .footer-bottom {
      border-top: 1px solid #f6dede;
      padding-top: 25px;
      text-align: center;
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 悬浮客服面板 */
    .float-panel {
      position: fixed;
      right: 20px;
      bottom: 40px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      z-index: 999;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: var(--primary-red);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      box-shadow: 0 6px 16px rgba(211, 47, 47, 0.35);
      cursor: pointer;
      transition: all 0.25s ease;
    }

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

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #fff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .grid-3, .grid-4, .article-list, .flow-steps {
        grid-template-columns: 1fr;
      }
      .form-row, .contact-card-wrap {
        grid-template-columns: 1fr;
      }
      .hero-content h1 {
        font-size: 28px;
      }
      .section-title {
        font-size: 24px;
      }
      .review-score-banner {
        flex-direction: column;
        text-align: center;
        gap: 15px;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
    }