:root {
      --primary: #7c3aed;
      --primary-hover: #6d28d9;
      --primary-light: #f5f3ff;
      --secondary: #ec4899;
      --accent: #8b5cf6;
      --text-dark: #1e1b4b;
      --text-main: #334155;
      --text-light: #64748b;
      --bg-page: #fbfbfe;
      --bg-card: #ffffff;
      --border-color: #ede9fe;
      --shadow-sm: 0 4px 6px -1px rgba(124, 58, 237, 0.06), 0 2px 4px -2px rgba(124, 58, 237, 0.04);
      --shadow-md: 0 10px 25px -3px rgba(124, 58, 237, 0.1), 0 4px 6px -4px rgba(124, 58, 237, 0.05);
      --shadow-lg: 0 20px 30px -10px rgba(124, 58, 237, 0.15);
      --radius: 12px;
      --radius-sm: 6px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }

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

    ul, ol {
      list-style: none;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    .section {
      padding: 70px 0;
      position: relative;
    }

    .section-alt {
      background: linear-gradient(180deg, #f8f6ff 0%, #ffffff 100%);
    }

    .section-header {
      text-align: center;
      margin-bottom: 45px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: var(--primary-light);
      color: var(--primary);
      font-size: 0.875rem;
      font-weight: 600;
      border-radius: 9999px;
      margin-bottom: 12px;
      border: 1px solid var(--border-color);
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-dark);
      letter-spacing: -0.5px;
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-light);
      max-width: 680px;
      margin: 0 auto;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: none;
      outline: none;
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .btn-primary {
      background: linear-gradient(135deg, #7c3aed 0%, #9333ea 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(124, 58, 237, 0.35);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #6d28d9 0%, #7e22ce 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(124, 58, 237, 0.45);
    }

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

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }

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

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

    .brand-name {
      font-size: 1.3rem;
      font-weight: 800;
      color: var(--text-dark);
      letter-spacing: -0.5px;
    }

    .brand-name span {
      color: var(--primary);
    }

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

    .nav-item {
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
    }

    .nav-item:hover, .nav-item.active {
      color: var(--primary);
      background: var(--primary-light);
    }

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

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-dark);
      cursor: pointer;
      padding: 6px;
    }

    /* Hero 首屏 - 纯CSS亮紫氛围，严禁图片 */
    .hero-section {
      padding: 90px 0 70px;
      background: radial-gradient(circle at 85% 15%, rgba(236, 72, 153, 0.12) 0%, transparent 40%),
                  radial-gradient(circle at 15% 85%, rgba(124, 58, 237, 0.15) 0%, transparent 50%),
                  linear-gradient(180deg, #ffffff 0%, #fbf9ff 100%);
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 880px;
      margin: 0 auto;
    }

    .hero-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 9999px;
      font-size: 0.9rem;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-pill-badge {
      background: var(--primary);
      color: #fff;
      font-size: 0.75rem;
      padding: 2px 8px;
      border-radius: 9999px;
    }

    .hero-title {
      font-size: 2.6rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-dark);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      line-height: 1.7;
      color: var(--text-light);
      margin-bottom: 36px;
      max-width: 720px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 10px;
    }

    .stat-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }

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

    .stat-number {
      font-size: 1.9rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.85rem;
      color: var(--text-light);
      font-weight: 500;
    }

    /* 平台介绍 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .about-badge-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 24px;
    }

    .about-badge {
      background: var(--primary-light);
      color: var(--primary);
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 0.875rem;
      font-weight: 600;
      border: 1px solid var(--border-color);
    }

    .feature-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-top: 24px;
    }

    .feature-item {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .feature-icon {
      color: var(--primary);
      font-weight: bold;
    }

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

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

    .card {
      background: var(--bg-card);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

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

    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      margin-bottom: 16px;
      font-weight: bold;
    }

    .card-title {
      font-size: 1.15rem;
      color: var(--text-dark);
      margin-bottom: 10px;
      font-weight: 700;
    }

    .card-desc {
      font-size: 0.9rem;
      color: var(--text-light);
      line-height: 1.6;
      flex-grow: 1;
    }

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

    .step-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px 16px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-num {
      width: 32px;
      height: 32px;
      background: var(--primary);
      color: #fff;
      border-radius: 50%;
      margin: 0 auto 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.9rem;
      font-weight: bold;
    }

    .step-name {
      font-size: 1rem;
      color: var(--text-dark);
      font-weight: 700;
      margin-bottom: 6px;
    }

    .step-text {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* 案例展示 */
    .case-media-wrap {
      border-radius: var(--radius-sm);
      overflow: hidden;
      margin-bottom: 14px;
      background: #f1edfd;
    }

    .case-media-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }

    .case-card:hover .case-media-wrap img {
      transform: scale(1.03);
    }

    /* 对比评测表格 */
    .review-highlight {
      background: #ffffff;
      border: 2px solid var(--accent);
      border-radius: var(--radius);
      padding: 28px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      box-shadow: var(--shadow-md);
    }

    .review-score-box {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .score-big {
      font-size: 3rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }

    .score-meta {
      font-size: 0.9rem;
      color: var(--text-light);
    }

    .score-stars {
      color: #f59e0b;
      font-size: 1.3rem;
      margin-bottom: 4px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 640px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .compare-table th {
      background: #faf8ff;
      color: var(--text-dark);
      font-weight: 700;
    }

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

    .col-highlight {
      background: rgba(124, 58, 237, 0.03);
      font-weight: 600;
      color: var(--primary);
    }

    /* 需求匹配表单与联系 */
    .form-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #ffffff;
      padding: 36px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

    .contact-info-block {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .contact-card-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .contact-icon {
      width: 36px;
      height: 36px;
      background: var(--primary-light);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: bold;
    }

    .qr-box {
      margin-top: 10px;
      padding: 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      display: inline-block;
      text-align: center;
      background: #fafafa;
    }

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

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

    .form-label {
      display: block;
      margin-bottom: 6px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-dark);
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s ease;
      background: #fdfdfd;
      color: var(--text-main);
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      background: #ffffff;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-question {
      padding: 16px 20px;
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1rem;
      font-weight: 600;
      color: var(--text-dark);
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.25s 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 20px;
      color: var(--text-light);
      font-size: 0.92rem;
      line-height: 1.6;
    }

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

    /* 用户评论卡片 */
    .comment-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 22px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .comment-text {
      font-size: 0.92rem;
      color: var(--text-main);
      margin-bottom: 16px;
      font-style: normal;
      line-height: 1.65;
    }

    .comment-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .user-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
    }

    .user-info-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-dark);
    }

    .user-info-role {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* 最新文章与模型标签 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .article-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 10px;
    }

    .article-title:hover {
      color: var(--primary);
    }

    .tags-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      justify-content: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .tag-chip {
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--text-main);
      padding: 6px 14px;
      border-radius: 9999px;
      font-size: 0.85rem;
      font-weight: 500;
      box-shadow: var(--shadow-sm);
    }

    .tag-chip:hover {
      color: var(--primary);
      border-color: var(--primary);
    }

    /* 浮动客服入口 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: linear-gradient(135deg, #7c3aed, #9333ea);
      color: #ffffff;
      border-radius: 50%;
      box-shadow: var(--shadow-lg);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      cursor: pointer;
      border: none;
      transition: transform 0.25s ease;
    }

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

    /* 页脚 */
    .site-footer {
      background: #181126;
      color: #cbd5e1;
      padding: 50px 0 25px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }

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

    .footer-title {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .footer-text {
      font-size: 0.88rem;
      line-height: 1.7;
      color: #94a3b8;
    }

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

    .footer-links a {
      color: #cbd5e1;
      font-size: 0.88rem;
    }

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

    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 8px;
    }

    .friend-links-box a {
      color: #a78bfa;
      font-size: 0.85rem;
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: 4px;
    }

    .friend-links-box a:hover {
      color: #ffffff;
      background: rgba(124, 58, 237, 0.3);
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 20px;
      text-align: center;
      font-size: 0.82rem;
      color: #64748b;
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .cards-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .cards-grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps {
        grid-template-columns: repeat(3, 1fr);
      }
      .about-grid, .form-layout, .footer-main {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-subtitle {
        font-size: 1rem;
      }
      .section-title {
        font-size: 1.55rem;
      }
      .cards-grid-3, .cards-grid-4, .hero-stats-grid, .flow-steps, .articles-grid {
        grid-template-columns: 1fr;
      }
      .form-layout {
        padding: 20px;
      }
      .nav-actions .btn-secondary {
        display: none;
      }
    }