:root {
      --primary-purple: #7928ca;
      --primary-light: #9d4edd;
      --primary-subtle: #f3e8ff;
      --primary-glow: rgba(121, 40, 202, 0.15);
      --accent-pink: #d946ef;
      --accent-cyan: #06b6d4;
      --bg-main: #fcfaff;
      --bg-card: #ffffff;
      --bg-alt: #f6f0fd;
      --text-main: #1f1a2e;
      --text-muted: #5e5473;
      --text-light: #8e83a8;
      --border-color: #eadcf8;
      --border-focus: #c084fc;
      --shadow-sm: 0 4px 12px rgba(121, 40, 202, 0.05);
      --shadow-md: 0 10px 25px rgba(121, 40, 202, 0.09);
      --shadow-lg: 0 18px 40px rgba(121, 40, 202, 0.14);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-max: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: radial-gradient(circle at 10% 0%, #f7eaff 0%, #faf5ff 40%, #fcfaff 100%);
      color: var(--text-main);
      min-height: 100vh;
      overflow-x: hidden;
    }

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

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

    /* 容器基准 */
    .site-container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

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

    .brand-name {
      font-size: 20px;
      font-weight: 800;
      color: var(--primary-purple);
      letter-spacing: -0.5px;
    }

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

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

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary-purple);
      background: var(--primary-subtle);
    }

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

    .btn-nav-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 8px 18px;
      font-size: 14px;
      font-weight: 700;
      color: #ffffff !important;
      background: linear-gradient(135deg, var(--primary-purple), var(--accent-pink));
      border-radius: 99px;
      box-shadow: 0 4px 14px rgba(121, 40, 202, 0.3);
    }

    .btn-nav-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(121, 40, 202, 0.4);
    }

    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      font-size: 24px;
      color: var(--primary-purple);
      cursor: pointer;
      padding: 4px;
    }

    /* 首屏 Hero (严格无图片) */
    .hero-section {
      padding: 64px 0 56px;
      position: relative;
      text-align: center;
    }

    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #eedaff;
      border: 1px solid #d8b4fe;
      border-radius: 99px;
      font-size: 13px;
      font-weight: 700;
      color: #6b21a8;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 42px;
      font-weight: 900;
      line-height: 1.25;
      color: #2e1065;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title .highlight {
      color: var(--primary-purple);
      position: relative;
    }

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

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

    .btn-hero-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 36px;
      font-size: 16px;
      font-weight: 700;
      color: #ffffff !important;
      background: linear-gradient(135deg, #7928ca 0%, #c026d3 100%);
      border-radius: 99px;
      box-shadow: 0 8px 24px rgba(121, 40, 202, 0.35);
      border: 1px solid rgba(255, 255, 255, 0.4);
    }

    .btn-hero-primary:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 12px 30px rgba(121, 40, 202, 0.45);
    }

    .btn-hero-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 30px;
      font-size: 16px;
      font-weight: 700;
      color: var(--primary-purple);
      background: #ffffff;
      border: 1px solid #d8b4fe;
      border-radius: 99px;
      box-shadow: var(--shadow-sm);
    }

    .btn-hero-secondary:hover {
      background: var(--primary-subtle);
      border-color: var(--primary-purple);
      transform: translateY(-2px);
    }

    .hero-highlights-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      max-width: 1060px;
      margin: 0 auto;
      text-align: left;
    }

    .hero-stat-card {
      background: #ffffff;
      padding: 20px 22px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

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

    .stat-label {
      font-size: 13px;
      font-weight: 700;
      color: var(--primary-purple);
      margin-bottom: 6px;
    }

    .stat-val {
      font-size: 22px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .stat-sub {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.4;
    }

    /* 模块通用样式 */
    .page-section {
      padding: 72px 0;
      border-top: 1px solid rgba(234, 220, 248, 0.6);
    }

    .page-section.alt-bg {
      background: #fbf6ff;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 44px;
    }

    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary-purple);
      background: var(--primary-subtle);
      padding: 4px 14px;
      border-radius: 99px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.3;
    }

    .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: 28px;
      align-items: center;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

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

    .card-icon-badge {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      background: var(--primary-subtle);
      color: var(--primary-purple);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 18px;
      margin-bottom: 18px;
    }

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

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

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

    .model-badge {
      font-size: 13px;
      font-weight: 600;
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid #e2d1f7;
      border-radius: 99px;
      color: #4b3869;
      box-shadow: 0 2px 6px rgba(121, 40, 202, 0.04);
      transition: all 0.2s ease;
    }

    .model-badge:hover {
      background: var(--primary-purple);
      color: #ffffff;
      border-color: var(--primary-purple);
    }

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

    .step-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      position: relative;
    }

    .step-num {
      display: inline-block;
      font-size: 12px;
      font-weight: 800;
      background: var(--primary-purple);
      color: #fff;
      padding: 2px 10px;
      border-radius: 99px;
      margin-bottom: 12px;
    }

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

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

    /* 案例展示区图片卡片 */
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease;
    }

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

    .media-card-img-wrap {
      width: 100%;
      background: #f0e6fc;
      overflow: hidden;
    }

    .media-card-img-wrap img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

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

    .media-card-body {
      padding: 18px 20px;
    }

    .media-card-body h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }

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

    /* 对比评测表格与评分板 */
    .review-score-panel {
      background: linear-gradient(135deg, #7928ca 0%, #a855f7 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 32px;
      margin-bottom: 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 14px 30px rgba(121, 40, 202, 0.25);
    }

    .score-left h3 {
      font-size: 24px;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .score-left p {
      font-size: 14px;
      opacity: 0.9;
    }

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

    .stars-box {
      font-size: 22px;
      color: #fbbf24;
      letter-spacing: 2px;
    }

    .score-number {
      font-size: 48px;
      font-weight: 900;
      line-height: 1;
      color: #ffffff;
    }

    .score-number span {
      font-size: 20px;
      opacity: 0.8;
      font-weight: 500;
    }

    .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);
    }

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

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

    .comparison-table th {
      background: #f7effe;
      font-weight: 700;
      color: var(--primary-purple);
    }

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

    .comparison-table tr:hover td {
      background: #faf5ff;
    }

    .badge-check {
      display: inline-block;
      color: #10b981;
      font-weight: 800;
    }

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

    .testimonial-body {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      position: relative;
    }

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

    .user-avatar-circle {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: #eedaff;
      color: var(--primary-purple);
      font-weight: 800;
      font-size: 15px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .user-meta h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

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

    /* FAQ 手风琴 */
    .faq-wrapper {
      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;
      box-shadow: var(--shadow-sm);
      transition: border-color 0.2s;
    }

    .faq-item.active {
      border-color: var(--primary-purple);
    }

    .faq-question {
      padding: 18px 22px;
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
    }

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

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 22px;
      background: #fdfbff;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 14px 22px 20px;
      border-top: 1px solid #f3e8ff;
    }

    /* 需求提交表单 */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px 32px;
      box-shadow: var(--shadow-md);
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 20px;
    }

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

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

    .form-label {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-main);
    }

    .form-input,
    .form-select,
    .form-textarea {
      width: 100%;
      padding: 12px 14px;
      font-size: 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #faf8fd;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
      font-family: inherit;
    }

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      border-color: var(--primary-purple);
      background: #ffffff;
      box-shadow: 0 0 0 3px var(--primary-glow);
    }

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

    .btn-form-submit {
      width: 100%;
      padding: 14px;
      font-size: 16px;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary-purple), var(--accent-pink));
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 6px 18px rgba(121, 40, 202, 0.3);
      transition: all 0.25s ease;
    }

    .btn-form-submit:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(121, 40, 202, 0.4);
    }

    /* 资讯与友情链接 */
    .article-links-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-bottom: 24px;
    }

    .article-links-box h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 14px;
      color: var(--primary-purple);
    }

    .article-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      list-style: none;
    }

    .article-list a {
      font-size: 13px;
      color: var(--text-muted);
      background: #f7f1fc;
      padding: 6px 14px;
      border-radius: 99px;
      display: inline-block;
    }

    .article-list a:hover {
      background: var(--primary-purple);
      color: #ffffff;
    }

    /* 页脚 */
    .site-footer {
      background: #181126;
      color: #d1c8e2;
      padding: 56px 0 28px;
      border-top: 1px solid #2e2246;
    }

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

    .footer-col h4 {
      font-size: 16px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 18px;
    }

    .footer-col p {
      font-size: 13px;
      line-height: 1.7;
      margin-bottom: 10px;
      color: #aba0c2;
    }

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

    .footer-col ul a {
      font-size: 13px;
      color: #aba0c2;
    }

    .footer-col ul a:hover {
      color: #d946ef;
      padding-left: 4px;
    }

    .footer-qr-card {
      background: #251b3b;
      padding: 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
      text-align: center;
      border: 1px solid #3d2f5e;
    }

    .footer-qr-card img {
      width: 100px;
      height: 100px;
      margin: 0 auto 8px;
      border-radius: 4px;
    }

    .footer-qr-card span {
      font-size: 12px;
      color: #d8b4fe;
    }

    .friend-links-bar {
      border-top: 1px solid #281d3f;
      padding-top: 20px;
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 13px;
    }

    .friend-links-bar span {
      color: #8b7ca8;
      font-weight: 600;
    }

    .friend-links-bar a {
      color: #a89bc2;
      margin-right: 10px;
    }

    .friend-links-bar a:hover {
      color: #ffffff;
      text-decoration: underline;
    }

    .footer-bottom {
      border-top: 1px solid #281d3f;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
      color: #7b6d94;
    }

    /* 悬浮客服面板 */
    .floating-contact {
      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: #7928ca;
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(121, 40, 202, 0.4);
      cursor: pointer;
      position: relative;
      transition: transform 0.2s ease, background 0.2s ease;
      border: none;
      font-size: 20px;
    }

    .float-btn:hover {
      transform: scale(1.08);
      background: #9d4edd;
    }

    .float-qr-pop {
      position: absolute;
      right: 56px;
      bottom: 0;
      background: #ffffff;
      padding: 14px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: none;
      width: 150px;
      text-align: center;
      color: var(--text-main);
    }

    .float-qr-pop img {
      width: 120px;
      height: 120px;
      margin: 0 auto 6px;
    }

    .float-qr-pop p {
      font-size: 12px;
      font-weight: 700;
      color: var(--primary-purple);
    }

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

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 32px;
      }
      .hero-highlights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3,
      .grid-4,
      .step-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .grid-2 {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 26px;
      }
      .hero-desc {
        font-size: 15px;
      }
      .hero-highlights-grid,
      .grid-3,
      .grid-4,
      .step-list,
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .review-score-panel {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full-width {
        grid-column: span 1;
      }
      .site-container {
        padding: 0 16px;
      }
    }