:root {
      --primary-purple: #7026e6;
      --light-purple: #9254de;
      --vibrant-violet: #6218d6;
      --bg-light: #f9f7fe;
      --card-bg: #ffffff;
      --text-main: #201b2d;
      --text-muted: #5e5772;
      --border-color: #eadcfc;
      --accent-pink: #f759ab;
      --shadow-sm: 0 4px 12px rgba(112, 38, 230, 0.06);
      --shadow-hover: 0 12px 28px rgba(112, 38, 230, 0.15);
      --max-width: 1200px;
    }

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

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

    body {
      background: linear-gradient(180deg, #fbf9ff 0%, #f6f0fe 100%);
      min-height: 100vh;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(112, 38, 230, 0.04);
    }

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

    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

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

    .brand-text {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-purple);
      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;
      color: var(--text-main);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      transition: color 0.25s ease;
    }

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

    .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;
      text-decoration: none;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-purple) 0%, var(--vibrant-violet) 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(112, 38, 230, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(112, 38, 230, 0.45);
      color: #ffffff;
    }

    .btn-secondary {
      background: #ffffff;
      color: var(--primary-purple);
      border: 1px solid var(--primary-purple);
    }

    .btn-secondary:hover {
      background: #f4ecfd;
      transform: translateY(-2px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

    .menu-toggle span {
      display: block;
      width: 24px;
      height: 3px;
      background: var(--text-main);
      margin: 4px 0;
      border-radius: 2px;
      transition: 0.3s;
    }

    /* 首屏纯代码无图视觉区 */
    .hero-section {
      padding: 80px 0 60px;
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #eee4fc;
      color: var(--primary-purple);
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 24px;
      border: 1px solid rgba(112, 38, 230, 0.2);
    }

    .hero-title {
      font-size: 2.5rem;
      line-height: 1.25;
      font-weight: 800;
      color: #1a122e;
      margin-bottom: 20px;
    }

    .hero-title span {
      background: linear-gradient(135deg, #7026e6 0%, #ba25c6 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-lead {
      max-width: 820px;
      margin: 0 auto 36px;
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

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

    .stat-card {
      background: #ffffff;
      padding: 24px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease;
    }

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

    .stat-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-purple);
      margin-bottom: 4px;
    }

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

    /* 通用区块排版 */
    section.page-section {
      padding: 70px 0;
      border-bottom: 1px solid rgba(234, 220, 252, 0.5);
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 0.85rem;
      text-transform: uppercase;
      font-weight: 700;
      letter-spacing: 1px;
      color: var(--primary-purple);
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
    }

    /* 平台核心能力卡片 */
    .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: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
    }

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

    .card-icon-box {
      width: 52px;
      height: 52px;
      background: #f4ecfd;
      color: var(--primary-purple);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      font-weight: bold;
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 1.25rem;
      margin-bottom: 12px;
      color: var(--text-main);
    }

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

    /* 场景分类卡片 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 20px;
    }

    .scenario-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 22px;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .scenario-item:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-sm);
      border-color: var(--light-purple);
    }

    .scenario-item h4 {
      color: var(--primary-purple);
      font-size: 1.1rem;
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .scenario-item p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 支持模型标签池 */
    .tags-container {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      padding: 20px;
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid var(--border-color);
    }

    .model-tag {
      padding: 6px 14px;
      background: #f6f0fe;
      border: 1px solid #ebd8fc;
      border-radius: 6px;
      font-size: 0.85rem;
      color: var(--primary-purple);
      font-weight: 500;
      transition: all 0.2s;
    }

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

    /* 图文案例展示 */
    .media-case-card {
      background: #ffffff;
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .media-container {
      width: 100%;
      background: #f3ecfb;
      overflow: hidden;
    }

    .media-container img {
      width: 100%;
      max-width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

    .media-case-card:hover .media-container img {
      transform: scale(1.02);
    }

    .media-content {
      padding: 22px;
    }

    .media-content h3 {
      font-size: 1.15rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .media-content p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .promo-gallery {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 30px;
    }

    .promo-gallery img.ai-page-image {
      border-radius: 8px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }

    /* 对比评测表格 */
    .table-wrapper {
      overflow-x: auto;
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

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

    .compare-table th,
    .compare-table td {
      padding: 18px 20px;
      border-bottom: 1px solid #f1e6fd;
      font-size: 0.95rem;
    }

    .compare-table th {
      background: #f8f4fe;
      color: var(--primary-purple);
      font-weight: 700;
    }

    .compare-table tr:hover td {
      background: #fdfcff;
    }

    .badge-star {
      display: inline-block;
      background: #fff7e6;
      color: #fa8c16;
      padding: 4px 10px;
      border-radius: 4px;
      font-weight: bold;
    }

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

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
      position: relative;
    }

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

    .avatar-circle {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--light-purple) 0%, var(--primary-purple) 100%);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 1.1rem;
    }

    .reviewer-info h4 {
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .reviewer-info p {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* FAQ 手风琴面板 */
    .faq-list {
      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: 10px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      color: var(--text-main);
      font-size: 1rem;
      transition: background 0.2s;
    }

    .faq-question:hover {
      background: #fbf9ff;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background: #fdfcff;
      border-top: 1px solid transparent;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.6;
    }

    .faq-item.open .faq-answer {
      max-height: 300px;
      padding: 16px 24px 22px;
      border-top-color: #f1e7fe;
    }

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

    /* 表单与需求接入 */
    .form-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
      margin-bottom: 20px;
    }

    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid #d9cced;
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s;
      background: #fcfbfe;
    }

    .form-control:focus {
      border-color: var(--primary-purple);
      background: #ffffff;
    }

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

    /* 流程指示组件 */
    .steps-wrapper {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-box {
      background: #ffffff;
      padding: 24px;
      border-radius: 10px;
      border: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary-purple);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 14px;
      font-weight: bold;
    }

    .step-box h4 {
      font-size: 1.05rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .step-box p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 文章列表 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
      margin-top: 20px;
    }

    .article-item {
      background: #ffffff;
      padding: 16px 20px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      text-decoration: none;
      color: var(--text-main);
      font-size: 0.95rem;
      font-weight: 500;
      transition: all 0.2s ease;
    }

    .article-item:hover {
      border-color: var(--primary-purple);
      color: var(--primary-purple);
      transform: translateX(4px);
    }

    /* 页脚 */
    footer.site-footer {
      background: #191424;
      color: #b7b0cc;
      padding: 60px 0 30px;
      border-top: 3px solid var(--primary-purple);
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.3rem;
      margin-bottom: 14px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.6;
      margin-bottom: 16px;
      color: #a49cb8;
    }

    .footer-links h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 16px;
    }

    .footer-links ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links ul li a {
      color: #b7b0cc;
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s;
    }

    .footer-links ul li a:hover {
      color: #ffffff;
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 12px;
      font-size: 0.9rem;
      color: #b7b0cc;
    }

    .footer-qr-block {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-qr-block img {
      width: 100px;
      height: 100px;
      border-radius: 6px;
      background: #ffffff;
      padding: 4px;
    }

    .friend-links-bar {
      border-top: 1px solid #2b233d;
      padding-top: 24px;
      margin-top: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .friend-links-bar span {
      color: #8c83a5;
      font-size: 0.85rem;
    }

    .friend-links-bar a {
      color: #b7b0cc;
      text-decoration: none;
      font-size: 0.85rem;
      transition: color 0.2s;
    }

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

    .footer-bottom {
      border-top: 1px solid #2b233d;
      padding-top: 24px;
      margin-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #7b7391;
    }

    /* 悬浮客服面板 */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-hover);
      border-radius: 12px;
      padding: 12px;
      text-align: center;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
    }

    .float-kefu img {
      width: 80px;
      height: 80px;
      border-radius: 6px;
    }

    .float-kefu span {
      font-size: 0.78rem;
      font-weight: 600;
      color: var(--primary-purple);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.1rem;
      }
      .hero-highlights,
      .steps-wrapper,
      .promo-gallery {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3,
      .review-grid {
        grid-template-columns: 1fr;
      }
      .grid-2 {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px 0;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-sm);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        display: block;
        padding: 12px;
      }
      .form-row {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
      .hero-highlights {
        grid-template-columns: 1fr;
      }
      .promo-gallery {
        grid-template-columns: 1fr 1fr;
      }
      .float-kefu {
        right: 10px;
        bottom: 20px;
        scale: 0.9;
      }
    }