:root {
      --primary: #6b21a8;
      --primary-bright: #9333ea;
      --primary-light: #f3e8ff;
      --secondary: #d946ef;
      --accent: #ec4899;
      --dark: #1e1135;
      --text-main: #2b1f45;
      --text-muted: #5f5476;
      --bg-page: #faf7fd;
      --bg-card: #ffffff;
      --border-color: #e9d5ff;
      --container-max: 1200px;
      --shadow-sm: 0 2px 8px rgba(107, 33, 168, 0.06);
      --shadow-md: 0 10px 25px rgba(107, 33, 168, 0.08);
      --shadow-lg: 0 16px 36px rgba(107, 33, 168, 0.12);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 10% 20%, rgba(217, 70, 239, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(147, 51, 234, 0.05) 0%, transparent 40%);
    }

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

    ul, ol {
      list-style: none;
    }

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      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, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

    .brand-logo-box {
      width: 130px;
      display: flex;
      align-items: center;
    }

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

    .nav-links a {
      padding: 8px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      border-radius: 6px;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-bright);
      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: 14px;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-bright), var(--accent));
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(147, 51, 234, 0.35);
    }

    .btn-primary:hover {
      box-shadow: 0 6px 18px rgba(147, 51, 234, 0.5);
      transform: translateY(-2px);
      color: #ffffff;
    }

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

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

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary);
      cursor: pointer;
    }

    /* 首屏 Hero (无图设计，高科技亮紫流光) */
    .hero-section {
      padding: 90px 0 70px;
      position: relative;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--primary-light);
      border: 1px solid var(--border-color);
      color: var(--primary);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-badge span {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--secondary);
      box-shadow: 0 0 8px var(--secondary);
    }

    .hero-title {
      font-size: 40px;
      line-height: 1.25;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title .text-gradient {
      background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.6;
    }

    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    .hero-cta-group .btn-lg {
      padding: 14px 34px;
      font-size: 16px;
      border-radius: 10px;
    }

    .hero-features-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 24px;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

    .hero-stat-card {
      text-align: center;
      padding: 10px;
      border-right: 1px solid var(--border-color);
    }

    .hero-stat-card:last-child {
      border-right: none;
    }

    .hero-stat-number {
      font-size: 26px;
      font-weight: 800;
      color: var(--primary-bright);
      margin-bottom: 4px;
    }

    .hero-stat-label {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 区域通用样式 */
    .section-block {
      padding: 80px 0;
      border-bottom: 1px solid rgba(233, 213, 255, 0.6);
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary-bright);
      margin-bottom: 8px;
      display: inline-block;
    }

    .section-title {
      font-size: 30px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
    }

    /* 卡片网格 */
    .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 var(--border-color);
      border-radius: 14px;
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

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

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: linear-gradient(135deg, var(--primary-light), #fdf4ff);
      color: var(--primary-bright);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 20px;
      margin-bottom: 18px;
    }

    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 10px;
    }

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

    .card-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: 16px;
    }

    .mini-badge {
      font-size: 12px;
      background: var(--primary-light);
      color: var(--primary);
      padding: 3px 8px;
      border-radius: 4px;
    }

    /* 聚合模型云标签 */
    .model-pills-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 30px;
    }

    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    /* 流程步骤 */
    .workflow-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      text-align: left;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-num {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 14px;
    }

    /* 对比表格与评测面板 */
    .rating-highlight-box {
      background: linear-gradient(135deg, #fdf4ff, #faf5ff);
      border: 2px solid var(--border-color);
      border-radius: 16px;
      padding: 30px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
    }

    .rating-score-group {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .score-badge-circle {
      width: 80px;
      height: 80px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-bright), var(--accent));
      color: #ffffff;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 15px rgba(147, 51, 234, 0.3);
    }

    .score-val {
      font-size: 26px;
      font-weight: 800;
      line-height: 1;
    }

    .score-scale {
      font-size: 11px;
      opacity: 0.9;
    }

    .rating-meta h3 {
      font-size: 20px;
      color: var(--dark);
      margin-bottom: 6px;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 18px;
      letter-spacing: 2px;
    }

    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    .compare-table th, 
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

    .compare-table th {
      background: #faf5ff;
      color: var(--dark);
      font-weight: 700;
    }

    .compare-table tr:hover {
      background-color: #fcf9ff;
    }

    .highlight-col {
      background: rgba(243, 232, 255, 0.4);
      font-weight: 600;
      color: var(--primary);
    }

    /* 案例展示区 */
    .case-banner-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-bottom: 24px;
    }

    .case-banner-item {
      background: #ffffff;
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .case-banner-item .image-frame {
      width: 100%;
      height: 240px;
      overflow: hidden;
      background: #f3e8ff;
    }

    .case-banner-item img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }

    .case-banner-item:hover img {
      transform: scale(1.03);
    }

    .case-info {
      padding: 20px;
    }

    /* 用户评论卡片 */
    .review-card {
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

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

    .reviewer-info h4 {
      font-size: 15px;
      color: var(--dark);
    }

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

    .review-body {
      font-size: 13.5px;
      color: var(--text-main);
      line-height: 1.6;
    }

    /* FAQ 手风琴 */
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      margin-bottom: 12px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      font-size: 15px;
      font-weight: 600;
      color: var(--dark);
      background: none;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      transition: var(--transition);
    }

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

    .faq-icon {
      font-size: 18px;
      transition: transform 0.3s ease;
      color: var(--primary-bright);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0 24px;
      background: #faf7fd;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px 20px;
      border-top: 1px solid var(--border-color);
    }

    /* 表单与服务专区 */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 14px;
      color: var(--text-main);
      background-color: #faf7fd;
      transition: var(--transition);
      outline: none;
    }

    .form-control:focus {
      border-color: var(--primary-bright);
      background-color: #ffffff;
      box-shadow: 0 0 0 3px rgba(147, 51, 234, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* 文章列表 */
    .article-links-box {
      background: #ffffff;
      border-radius: 12px;
      padding: 24px;
      border: 1px solid var(--border-color);
    }

    .article-links-box ul {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
    }

    .article-links-box li a {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      color: var(--text-main);
      padding: 8px;
      border-radius: 6px;
    }

    .article-links-box li a:hover {
      color: var(--primary-bright);
      background: var(--primary-light);
    }

    /* 友情链接 */
    .friend-links-area {
      padding: 24px 0;
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      font-size: 13px;
    }

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

    .friend-links-list a {
      color: var(--text-muted);
    }

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

    /* 页脚 */
    .site-footer {
      background: #180b2b;
      color: #d1c4e9;
      padding: 60px 0 30px;
      font-size: 14px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.2fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      margin-bottom: 18px;
      position: relative;
      padding-bottom: 8px;
    }

    .footer-col h4::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 0;
      width: 24px;
      height: 2px;
      background: var(--secondary);
    }

    .footer-col p {
      font-size: 13.5px;
      line-height: 1.7;
      margin-bottom: 10px;
      color: #bfaedc;
    }

    .footer-links-list li {
      margin-bottom: 8px;
    }

    .footer-links-list a {
      color: #bfaedc;
    }

    .footer-links-list a:hover {
      color: #ffffff;
      padding-left: 4px;
    }

    .qr-frame {
      width: 110px;
      background: #ffffff;
      padding: 6px;
      border-radius: 8px;
      margin-top: 10px;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #9f8bbd;
    }

    /* 浮动客服挂件与返回顶部 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: var(--primary-bright);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(107, 33, 168, 0.35);
      cursor: pointer;
      border: none;
      transition: var(--transition);
      font-size: 18px;
    }

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

    .float-qr-hover {
      position: relative;
    }

    .float-qr-pop {
      position: absolute;
      right: 56px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 8px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      width: 140px;
      text-align: center;
      display: none;
    }

    .float-qr-pop p {
      font-size: 12px;
      color: var(--dark);
      margin-top: 6px;
    }

    .float-qr-hover:hover .float-qr-pop {
      display: block;
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .grid-4, .workflow-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-features-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stat-card:nth-child(2) {
        border-right: none;
      }
      .case-banner-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .hero-title {
        font-size: 28px;
      }
      .grid-2, .grid-3, .grid-4, .workflow-timeline, .hero-features-bar {
        grid-template-columns: 1fr;
      }
      .hero-stat-card {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
      }
      .hero-stat-card:last-child {
        border-bottom: none;
      }
      .rating-highlight-box {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
      .rating-score-group {
        flex-direction: column;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .article-links-box ul {
        grid-template-columns: 1fr;
      }
    }