:root {
      --primary: #e11d48;
      --primary-hover: #be123c;
      --primary-light: #fff1f2;
      --primary-subtle: #ffe4e6;
      --secondary: #9f1239;
      --accent: #f43f5e;
      --text-main: #1e293b;
      --text-muted: #475569;
      --text-light: #64748b;
      --bg-page: #fff8f9;
      --bg-surface: #ffffff;
      --bg-alt: #fdf2f4;
      --border-color: #fecdd3;
      --border-hover: #fda4af;
      --card-shadow: 0 10px 25px -5px rgba(225, 29, 72, 0.08), 0 8px 10px -6px rgba(225, 29, 72, 0.04);
      --card-shadow-hover: 0 20px 35px -8px rgba(225, 29, 72, 0.16), 0 10px 15px -5px rgba(225, 29, 72, 0.08);
      --radius: 12px;
      --transition: all 0.28s ease;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    .section {
      padding: 70px 0;
      position: relative;
    }

    .section-alt {
      background-color: var(--bg-alt);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

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

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background-color: var(--primary-light);
      color: var(--primary);
      border: 1px solid var(--border-color);
      border-radius: 999px;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--secondary);
      line-height: 1.3;
      margin-bottom: 14px;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background-color: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 4px 12px rgba(225, 29, 72, 0.03);
    }

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

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

    .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

    .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-item a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      padding: 8px 14px;
      border-radius: 6px;
      display: block;
    }

    .nav-item a:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: 8px;
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(225, 29, 72, 0.3);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      box-shadow: 0 6px 20px rgba(225, 29, 72, 0.4);
      transform: translateY(-1px);
      color: #ffffff;
    }

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

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

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
      color: var(--secondary);
    }

    /* 首屏 Hero (无图片，纯 CSS 科技感) */
    .hero-section {
      padding: 80px 0 65px;
      background: radial-gradient(circle at 85% 15%, rgba(254, 205, 211, 0.45) 0%, transparent 50%),
                  radial-gradient(circle at 10% 80%, rgba(255, 228, 230, 0.6) 0%, transparent 45%),
                  linear-gradient(180deg, #ffffff 0%, var(--bg-page) 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }

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

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 24px;
      box-shadow: 0 4px 12px rgba(225, 29, 72, 0.08);
    }

    .hero-tag .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(244, 63, 94, 0.25);
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      color: var(--secondary);
      line-height: 1.25;
      margin-bottom: 22px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 34px;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }

    .hero-actions .btn-lg {
      padding: 14px 34px;
      font-size: 1.1rem;
      font-weight: 700;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 20px;
    }

    .metric-card {
      background: #ffffff;
      padding: 22px 16px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      text-align: center;
      transition: var(--transition);
    }

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

    .metric-num {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 品牌模型支持滚动展示 */
    .model-badge-wrapper {
      margin-top: 35px;
      padding-top: 25px;
      border-top: 1px dashed var(--border-color);
    }

    .model-badge-title {
      font-size: 0.88rem;
      color: var(--text-light);
      margin-bottom: 12px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .model-pills {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }

    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 4px 10px;
      border-radius: 6px;
      font-size: 0.8rem;
      color: var(--text-main);
      font-weight: 500;
    }

    /* 网格卡片通用 */
    .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: 24px;
    }

    .card {
      background-color: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 26px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

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

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      margin-bottom: 18px;
      border: 1px solid var(--border-color);
    }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 10px;
    }

    .card-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .card-tag {
      margin-top: 14px;
      font-size: 0.8rem;
      font-weight: 600;
      color: var(--accent);
    }

    /* 流程与步骤 */
    .step-list {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

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

    .step-number {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      margin: 0 auto 16px auto;
    }

    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 对比评测表格与卡片 */
    .eval-highlight-box {
      background: linear-gradient(135deg, #ffffff 0%, var(--primary-light) 100%);
      border: 2px solid var(--primary);
      border-radius: var(--radius);
      padding: 30px;
      margin-bottom: 35px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

    .eval-score {
      display: flex;
      align-items: baseline;
      gap: 6px;
    }

    .eval-score-num {
      font-size: 3rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }

    .eval-score-max {
      font-size: 1.2rem;
      color: var(--text-light);
      font-weight: 700;
    }

    .eval-stars {
      color: #f59e0b;
      font-size: 1.3rem;
      margin-top: 4px;
    }

    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      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 var(--border-color);
      font-size: 0.95rem;
    }

    .compare-table th {
      background-color: var(--primary-light);
      color: var(--secondary);
      font-weight: 700;
    }

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

    .highlight-col {
      background-color: rgba(254, 226, 226, 0.35);
      font-weight: 700;
      color: var(--primary);
    }

    /* 案例与素材图展示 */
    .media-card {
      background: #ffffff;
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }

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

    .media-card-img {
      width: 100%;
      aspect-ratio: 16 / 9;
      object-fit: cover;
      background-color: var(--primary-light);
    }

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

    .media-card-body {
      padding: 20px;
    }

    /* 客户评价板块 */
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 0.95rem;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 18px;
      position: relative;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

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

    .user-info-name {
      font-weight: 700;
      color: var(--secondary);
      font-size: 0.95rem;
    }

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

    /* FAQ 手风琴面板 */
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-item.active {
      border-color: var(--primary);
      box-shadow: 0 4px 15px rgba(225, 29, 72, 0.08);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

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

    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.3s ease;
    }

    .faq-item.active .faq-toggle-icon {
      transform: rotate(180deg);
    }

    .faq-answer {
      padding: 0 24px 20px 24px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
      display: none;
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 表单与联系模块 */
    .form-wrapper {
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 18px;
      margin-bottom: 18px;
    }

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

    .form-group.full {
      grid-column: span 2;
    }

    .form-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: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
      background-color: #fff;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(225, 29, 72, 0.15);
    }

    textarea.form-control {
      min-height: 110px;
      resize: vertical;
    }

    .contact-info-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      height: 100%;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      margin-bottom: 20px;
    }

    .contact-item-title {
      font-size: 0.85rem;
      color: var(--text-light);
      font-weight: 600;
    }

    .contact-item-val {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--secondary);
    }

    .qr-box {
      text-align: center;
      padding: 16px;
      background: var(--primary-light);
      border-radius: 8px;
      border: 1px solid var(--border-color);
      margin-top: 10px;
    }

    .qr-box img {
      max-width: 130px;
      margin: 0 auto 8px auto;
      border-radius: 6px;
    }

    /* 行业资讯与文章 */
    .article-list {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-item {
      background: #ffffff;
      padding: 22px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .article-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 10px;
      line-height: 1.4;
    }

    .article-link {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary);
      margin-top: 12px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 友情链接与页脚 */
    .site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 25px 0;
      color: var(--text-muted);
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 35px;
    }

    .footer-col-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 16px;
    }

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

    .footer-links a {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

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

    .footer-friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 8px;
    }

    .footer-friend-links a {
      font-size: 0.85rem;
      color: var(--text-muted);
      background: var(--bg-page);
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid var(--border-color);
    }

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

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

    /* 浮动组件与返回顶部 */
    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 80px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      background: #ffffff;
      color: var(--primary);
      border-radius: 50%;
      box-shadow: 0 4px 16px rgba(225, 29, 72, 0.2);
      border: 1px solid var(--border-hover);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 1.1rem;
      transition: var(--transition);
    }

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

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .grid-3, .article-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4, .step-list, .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
      .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: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
    }

    @media (max-width: 768px) {
      .grid-2, .grid-3, .grid-4, .step-list, .hero-metrics, .article-list {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full {
        grid-column: span 1;
      }
      .hero-title {
        font-size: 2rem;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
      .section {
        padding: 45px 0;
      }
    }