:root {
      --primary: #7928ca;
      --primary-light: #9d4edd;
      --primary-dark: #5a189a;
      --secondary: #d946ef;
      --accent: #f72585;
      --bg-main: #faf7fd;
      --bg-card: #ffffff;
      --text-main: #1e1b2e;
      --text-muted: #5e5873;
      --border-color: #eadcf8;
      --shadow-sm: 0 4px 12px rgba(121, 40, 202, 0.06);
      --shadow-md: 0 10px 30px rgba(121, 40, 202, 0.1);
      --shadow-lg: 0 18px 45px rgba(121, 40, 202, 0.15);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }
    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }
    .brand-name {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      text-decoration: none;
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }
    .nav-links li a:hover {
      color: var(--primary);
      background: rgba(121, 40, 202, 0.06);
    }
    .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: 30px;
      text-decoration: none;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(121, 40, 202, 0.3);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(121, 40, 202, 0.4);
      color: #ffffff;
    }
    .btn-outline {
      background: #ffffff;
      color: var(--primary);
      border-color: var(--primary-light);
    }
    .btn-outline:hover {
      background: rgba(121, 40, 202, 0.05);
      border-color: var(--primary);
      color: var(--primary-dark);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 首屏 Hero */
    .hero-section {
      position: relative;
      padding: 90px 0 70px;
      background: radial-gradient(circle at 80% 20%, rgba(217, 70, 239, 0.12) 0%, transparent 40%),
                  radial-gradient(circle at 20% 80%, rgba(121, 40, 202, 0.1) 0%, transparent 40%),
                  linear-gradient(180deg, #ffffff 0%, var(--bg-main) 100%);
      text-align: center;
      overflow: hidden;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      border-radius: 20px;
      background: rgba(121, 40, 202, 0.08);
      border: 1px solid rgba(121, 40, 202, 0.2);
      color: var(--primary-dark);
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-subtitle {
      max-width: 820px;
      margin: 0 auto 36px;
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .hero-cta {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
    }
    .btn-hero {
      padding: 14px 34px;
      font-size: 16px;
      border-radius: 30px;
    }
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
    }
    .metric-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-light);
    }
    .metric-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 通用模块样式 */
    .section-wrapper {
      padding: 80px 0;
      position: relative;
    }
    .section-wrapper.bg-alt {
      background: #ffffff;
      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;
    }
    .section-tag {
      display: inline-block;
      color: var(--primary);
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
    }

    /* 平台矩阵 */
    .platform-chips {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 24px;
    }
    .chip {
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
      transition: var(--transition);
    }
    .chip:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    /* 服务卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .service-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 30px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
      border-color: var(--primary-light);
    }
    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(121, 40, 202, 0.12) 0%, rgba(217, 70, 239, 0.12) 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .card-title {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
    }
    .card-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }
    .card-tag {
      font-size: 12px;
      padding: 3px 8px;
      background: rgba(121, 40, 202, 0.05);
      color: var(--primary-dark);
      border-radius: 4px;
    }

    /* 流程步骤 */
    .workflow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-box {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 28px 20px;
      border: 1px solid var(--border-color);
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #fff;
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      box-shadow: 0 4px 10px rgba(121, 40, 202, 0.3);
    }
    .step-title {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-desc {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 案例展示 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .case-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .case-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }
    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #eee;
      overflow: hidden;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.03);
    }
    .case-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .case-meta {
      display: flex;
      justify-content: space-between;
      font-size: 13px;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 8px;
    }

    /* 宣传图画廊 */
    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 40px;
    }
    .banner-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      background: #fff;
    }
    .banner-item img {
      width: 100%;
      height: auto;
      display: block;
      transition: var(--transition);
    }
    .banner-item:hover img {
      transform: scale(1.04);
    }

    /* 对比评测卡片与表格 */
    .review-highlight {
      background: linear-gradient(135deg, rgba(121, 40, 202, 0.05) 0%, rgba(217, 70, 239, 0.05) 100%);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      margin-bottom: 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }
    .review-score-box {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .score-big {
      font-size: 48px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
    }
    .score-stars {
      color: #f59e0b;
      font-size: 20px;
      margin-bottom: 4px;
    }
    .score-label {
      font-size: 14px;
      color: var(--text-muted);
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .table-custom {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }
    .table-custom th, .table-custom td {
      padding: 16px 20px;
      border-bottom: 1px solid #f0e6fa;
    }
    .table-custom th {
      background: rgba(121, 40, 202, 0.04);
      color: var(--text-main);
      font-weight: 700;
    }
    .table-custom tr:last-child td {
      border-bottom: none;
    }
    .highlight-cell {
      background: rgba(121, 40, 202, 0.03);
      color: var(--primary-dark);
      font-weight: 700;
    }

    /* 用户评论 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-card:hover {
      border-color: var(--primary-light);
      transform: translateY(-4px);
    }
    .review-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
    }
    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .reviewer-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 14px;
    }
    .reviewer-name {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }
    .reviewer-role {
      font-size: 12px;
      color: var(--primary);
    }

    /* FAQ 折叠 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item:hover {
      border-color: var(--primary-light);
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }
    .faq-icon {
      font-size: 18px;
      color: var(--primary);
      transition: var(--transition);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: rgba(121, 40, 202, 0.02);
    }
    .faq-answer-inner {
      padding: 0 24px 18px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 资讯与百科 */
    .articles-box {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 24px;
    }
    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }
    .article-link-item {
      display: inline-block;
      padding: 8px 16px;
      background: var(--bg-main);
      border: 1px solid var(--border-color);
      border-radius: 6px;
      color: var(--text-main);
      text-decoration: none;
      font-size: 14px;
      transition: var(--transition);
    }
    .article-link-item:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    /* 联系我们与表单 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }
    .contact-info-col {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .contact-meta-item {
      margin-bottom: 20px;
    }
    .meta-title {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 4px;
    }
    .meta-value {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
    }
    .qr-box {
      margin-top: 20px;
      padding: 16px;
      background: var(--bg-main);
      border-radius: var(--radius-md);
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      border: 1px solid var(--border-color);
      width: fit-content;
    }
    .qr-box img {
      width: 130px;
      height: 130px;
      object-fit: contain;
      border-radius: 6px;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      outline: none;
      transition: var(--transition);
      background: var(--bg-main);
      color: var(--text-main);
    }
    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(121, 40, 202, 0.1);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* 友情链接与页脚 */
    .site-footer {
      background: #140d21;
      color: #d1c8e2;
      padding: 60px 0 30px;
      border-top: 1px solid #2d1e47;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-brand h3 {
      color: #ffffff;
      font-size: 20px;
      margin-bottom: 12px;
    }
    .footer-brand p {
      font-size: 14px;
      line-height: 1.6;
      color: #a79cb9;
      margin-bottom: 16px;
    }
    .footer-title {
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .footer-list {
      list-style: none;
    }
    .footer-list li {
      margin-bottom: 10px;
    }
    .footer-list a {
      color: #a79cb9;
      text-decoration: none;
      font-size: 14px;
      transition: var(--transition);
    }
    .footer-list a:hover {
      color: var(--secondary);
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }
    .friend-links a {
      color: #a79cb9;
      text-decoration: none;
      font-size: 13px;
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: 4px;
      transition: var(--transition);
    }
    .friend-links a:hover {
      color: #ffffff;
      background: var(--primary);
    }
    .footer-bottom {
      text-align: center;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 13px;
      color: #837798;
    }

    /* 浮动工具栏 */
    .float-toolbar {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 46px;
      height: 46px;
      background: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
      cursor: pointer;
      text-decoration: none;
      font-weight: 700;
      transition: var(--transition);
      border: 1px solid var(--border-color);
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.1);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-title { font-size: 32px; }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .workflow-steps { grid-template-columns: repeat(2, 1fr); }
      .review-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .contact-wrapper { grid-template-columns: 1fr; }
      .banner-gallery { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .mobile-menu-btn { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show { display: flex; }
      .nav-actions { display: none; }
      .hero-title { font-size: 26px; }
      .hero-metrics { grid-template-columns: repeat(2, 1fr); }
      .grid-3, .grid-4, .case-grid, .review-grid, .banner-gallery { grid-template-columns: 1fr; }
      .workflow-steps { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }