:root {
      --primary: #4f46e5;
      --primary-light: #6366f1;
      --primary-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #d946ef 100%);
      --accent-warm: linear-gradient(135deg, #f97316 0%, #ec4899 100%);
      --accent-cyan: #06b6d4;
      --accent-emerald: #10b981;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --border-focus: #818cf8;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(79, 70, 229, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 20px 35px -5px rgba(99, 102, 241, 0.18), 0 10px 15px -5px rgba(217, 70, 239, 0.1);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-width: 1200px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      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", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.08) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(217, 70, 239, 0.08) 0px, transparent 50%),
        radial-gradient(at 50% 100%, rgba(6, 182, 212, 0.06) 0px, transparent 50%);
      background-attachment: fixed;
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    /* 导航栏 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      box-shadow: 0 4px 20px rgba(79, 70, 229, 0.04);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      max-width: 180px;
    }

    .brand-logo img {
      max-height: 42px;
      width: auto;
      object-fit: contain;
    }

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

    .nav-links li {
      margin: 0;
      padding: 0;
    }

    .nav-links a {
      display: inline-block;
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      background: rgba(99, 102, 241, 0.08);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 9999px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-gradient {
      background: var(--primary-gradient);
      color: #ffffff !important;
      box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
    }

    .btn-gradient:hover {
      box-shadow: 0 6px 20px rgba(217, 70, 239, 0.45);
      transform: translateY(-2px);
    }

    .btn-warm {
      background: var(--accent-warm);
      color: #ffffff !important;
      box-shadow: 0 4px 15px rgba(249, 115, 22, 0.35);
    }

    .btn-warm:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 22px rgba(236, 72, 153, 0.45);
    }

    .btn-outline {
      border-color: #c7d2fe;
      color: var(--primary);
      background: #ffffff;
    }

    .btn-outline:hover {
      background: #eef2ff;
      border-color: var(--primary);
    }

    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .mobile-menu-btn span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: var(--transition);
    }

    /* 首屏 Hero (严格无图片) */
    .hero-section {
      position: relative;
      padding: 70px 0 60px;
      text-align: center;
      overflow: hidden;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      border-radius: 9999px;
      background: linear-gradient(90deg, rgba(238, 242, 255, 0.95), rgba(253, 242, 248, 0.95));
      border: 1px solid #c7d2fe;
      color: #4338ca;
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 22px;
      box-shadow: 0 2px 8px rgba(99, 102, 241, 0.12);
    }

    .hero-title {
      font-size: clamp(28px, 4.2vw, 44px);
      line-height: 1.25;
      font-weight: 900;
      letter-spacing: -0.5px;
      color: #0f172a;
      margin-bottom: 20px;
    }

    .hero-desc {
      max-width: 820px;
      margin: 0 auto 36px;
      font-size: clamp(15px, 1.8vw, 18px);
      color: var(--text-muted);
      line-height: 1.7;
    }

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

    .btn-hero-primary {
      padding: 14px 34px;
      font-size: 16px;
      letter-spacing: 0.5px;
    }

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

    .hero-stat-card {
      background: #ffffff;
      border: 1px solid rgba(226, 232, 240, 0.9);
      border-radius: var(--radius-md);
      padding: 22px 16px;
      box-shadow: var(--shadow-sm);
      position: relative;
      overflow: hidden;
      transition: var(--transition);
    }

    .hero-stat-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 4px;
      background: var(--primary-gradient);
    }

    .hero-stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #c7d2fe;
    }

    .stat-number {
      font-size: 32px;
      font-weight: 900;
      color: #312e81;
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-light);
    }

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

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 46px;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: #7c3aed;
      background: #ede9fe;
      border-radius: 9999px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: clamp(24px, 3.2vw, 34px);
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 模型矩阵徽章云 */
    .model-pills {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 24px;
    }

    .model-pill {
      font-size: 13px;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: 9999px;
      background: #ffffff;
      border: 1px solid #e0e7ff;
      color: #3730a3;
      box-shadow: 0 1px 4px rgba(79, 70, 229, 0.08);
      transition: var(--transition);
    }

    .model-pill:hover {
      background: #eef2ff;
      border-color: #6366f1;
      transform: translateY(-2px);
    }

    /* 卡片网格 */
    .feature-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .service-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      position: relative;
    }

    .service-card:hover {
      transform: translateY(-5px);
      border-color: #818cf8;
      box-shadow: var(--shadow-md);
    }

    .card-icon-box {
      width: 52px;
      height: 52px;
      border-radius: var(--radius-sm);
      background: linear-gradient(135deg, #e0e7ff 0%, #fae8ff 100%);
      color: #4f46e5;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 18px;
    }

    .service-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .service-card .card-badge {
      display: inline-block;
      align-self: flex-start;
      margin-top: 14px;
      font-size: 12px;
      font-weight: 600;
      color: #0284c7;
      background: #e0f2fe;
      padding: 3px 10px;
      border-radius: 4px;
    }

    /* 流程步骤 */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 16px;
      position: relative;
    }

    .process-step {
      background: #ffffff;
      padding: 24px 18px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
      position: relative;
      transition: var(--transition);
    }

    .process-step:hover {
      border-color: #c084fc;
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .step-number {
      width: 38px;
      height: 38px;
      margin: 0 auto 14px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 15px;
    }

    .process-step h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .process-step p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 对比评测专属样式 */
    .rating-header-card {
      background: linear-gradient(135deg, #fdf4ff 0%, #eef2ff 100%);
      border: 2px solid #e9d5ff;
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .score-group {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .score-big {
      font-size: 48px;
      font-weight: 900;
      color: #7e22ce;
      line-height: 1;
    }

    .score-scale {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-muted);
    }

    .star-row {
      color: #f59e0b;
      font-size: 20px;
      margin-top: 4px;
    }

    .comparison-table-wrap {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      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 var(--border-color);
      font-size: 14px;
    }

    .comparison-table th {
      background: #f1f5f9;
      font-weight: 700;
      color: var(--text-main);
    }

    .comparison-table th.highlight-col,
    .comparison-table td.highlight-col {
      background: #fdf4ff;
      font-weight: 700;
      color: #6b21a8;
      border-left: 2px solid #d946ef;
      border-right: 2px solid #d946ef;
    }

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

    /* 案例图片展示 */
    .case-gallery-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      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-container {
      width: 100%;
      aspect-ratio: 16 / 10;
      overflow: hidden;
      background: #f1f5f9;
    }

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

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

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

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

    .case-info h4 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .case-info p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 宣传横幅图模块 */
    .banner-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 36px;
    }

    .banner-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .banner-item img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    /* 客户评论卡片 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      padding: 26px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
    }

    .review-card:hover {
      border-color: #a855f7;
      box-shadow: var(--shadow-md);
    }

    .review-text {
      font-size: 14px;
      color: var(--text-main);
      line-height: 1.65;
      margin-bottom: 20px;
      position: relative;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 16px;
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #6366f1, #d946ef);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
    }

    .author-meta h5 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

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

    /* FAQ 手风琴 */
    .faq-wrapper {
      max-width: 880px;
      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: #818cf8;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      background: transparent;
      border: none;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

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

    .faq-icon {
      font-size: 18px;
      transition: transform 0.25s ease;
      color: var(--primary);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 24px;
      background: #fafafa;
    }

    .faq-item.active .faq-answer {
      padding: 16px 24px 22px;
      max-height: 300px;
    }

    .faq-answer p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 需求匹配与表单 */
    .contact-card-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      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-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 14px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      outline: none;
      transition: var(--transition);
      background: #f8fafc;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    }

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

    .contact-info-panel {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding-left: 20px;
      border-left: 1px solid var(--border-color);
    }

    .contact-detail-list {
      list-style: none;
      margin-bottom: 24px;
    }

    .contact-detail-list li {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .contact-detail-list strong {
      color: var(--text-main);
    }

    .qr-box {
      background: #f8fafc;
      border: 1px dashed #cbd5e1;
      border-radius: var(--radius-md);
      padding: 20px;
      text-align: center;
      max-width: 220px;
    }

    .qr-box img {
      max-width: 140px;
      height: auto;
      margin: 0 auto 8px;
      display: block;
      border-radius: 6px;
    }

    .qr-box span {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 文章列表 */
    .article-links-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 16px;
    }

    .article-links-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
    }

    .article-links-list a {
      font-size: 14px;
      color: #3b82f6;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      word-break: break-all;
    }

    .article-links-list a:hover {
      color: #1d4ed8;
      text-decoration: underline;
    }

    /* 友情链接与页脚 */
    .friend-links-wrap {
      padding: 30px 0 20px;
      border-top: 1px solid var(--border-color);
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px 20px;
    }

    .friend-links-wrap strong {
      font-size: 13px;
      color: var(--text-main);
    }

    .friend-links-wrap a {
      font-size: 13px;
      color: var(--text-light);
    }

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

    footer.site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 40px 0 30px;
      color: var(--text-muted);
      font-size: 13px;
    }

    .footer-top {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      margin-bottom: 24px;
    }

    .footer-copy {
      color: var(--text-light);
    }

    /* 浮动返回顶部与客服 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .tool-btn {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary);
      transition: var(--transition);
      font-weight: 700;
      font-size: 13px;
    }

    .tool-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-3px);
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .feature-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-gallery-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .review-grid {
        grid-template-columns: 1fr;
      }
      .contact-card-grid {
        grid-template-columns: 1fr;
        padding: 24px;
      }
      .contact-info-panel {
        padding-left: 0;
        border-left: none;
        border-top: 1px solid var(--border-color);
        padding-top: 24px;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 24px;
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-section {
        padding: 44px 0 40px;
      }
      .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .feature-grid-3 {
        grid-template-columns: 1fr;
      }
      .feature-grid-4 {
        grid-template-columns: 1fr;
      }
      .process-timeline {
        grid-template-columns: 1fr;
      }
      .case-gallery-grid {
        grid-template-columns: 1fr;
      }
      .banner-row {
        grid-template-columns: 1fr;
      }
      .article-links-list {
        grid-template-columns: 1fr;
      }
      .rating-header-card {
        flex-direction: column;
        align-items: flex-start;
      }
    }