:root {
      --primary: #ff2a6d;
      --primary-hover: #e01e5a;
      --primary-light: #fff0f5;
      --primary-gradient: linear-gradient(135deg, #ff2a6d 0%, #ff6584 100%);
      --accent: #9b00e8;
      --text-main: #1e2229;
      --text-muted: #5f6b7c;
      --text-light: #8c9ba5;
      --bg-main: #fdfafb;
      --bg-card: #ffffff;
      --border-color: #f7d6e0;
      --shadow-sm: 0 4px 12px rgba(255, 42, 109, 0.06);
      --shadow-md: 0 10px 30px rgba(255, 42, 109, 0.1);
      --shadow-lg: 0 20px 45px rgba(255, 42, 109, 0.15);
      --radius: 12px;
      --container-width: 1200px;
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }

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

    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-main);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }

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

    ul, ol {
      list-style: none;
    }

    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 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: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

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

    .logo-area img.ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }

    .brand-text {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

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

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      padding: 8px 14px;
      border-radius: 6px;
    }

    .nav-links a:hover {
      color: var(--primary);
      background: var(--primary-light);
    }

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

    .btn-header-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 8px 18px;
      background: var(--primary-gradient);
      color: #ffffff !important;
      font-weight: 700;
      font-size: 0.9rem;
      border-radius: 50px;
      box-shadow: 0 4px 14px rgba(255, 42, 109, 0.3);
    }

    .btn-header-cta:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 20px rgba(255, 42, 109, 0.4);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 首屏 Hero（无图片） */
    .hero-section {
      position: relative;
      padding: 90px 0 80px;
      background: radial-gradient(circle at 80% 20%, rgba(255, 42, 109, 0.12) 0%, transparent 50%),
                  radial-gradient(circle at 10% 80%, rgba(155, 0, 232, 0.08) 0%, transparent 40%),
                  #ffffff;
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: var(--primary-light);
      border: 1px solid var(--border-color);
      color: var(--primary);
      font-size: 0.88rem;
      font-weight: 700;
      border-radius: 50px;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-title span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.8;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-btns {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .btn-main-primary {
      padding: 14px 34px;
      background: var(--primary-gradient);
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 50px;
      box-shadow: 0 8px 24px rgba(255, 42, 109, 0.35);
      border: 2px solid transparent;
    }

    .btn-main-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 30px rgba(255, 42, 109, 0.45);
    }

    .btn-main-outline {
      padding: 14px 30px;
      background: #ffffff;
      color: var(--primary);
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 50px;
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-sm);
    }

    .btn-main-outline:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
    }

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

    .stat-card {
      background: rgba(255, 255, 255, 0.85);
      border: 1px solid var(--border-color);
      padding: 20px 16px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      text-align: center;
    }

    .stat-card .num {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-card .label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 通用Section */
    .section-wrap {
      padding: 80px 0;
      border-bottom: 1px solid rgba(255, 42, 109, 0.08);
    }

    .section-wrap.alt-bg {
      background: #ffffff;
    }

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-tag {
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.35;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 平台支持模型标签流 */
    .model-tags-container {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 24px;
    }

    .model-tag {
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 50px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .model-tag:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    /* 卡片网格 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

    .feature-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: 800;
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .feature-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

    .flow-step-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px 20px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .flow-step-num {
      width: 42px;
      height: 42px;
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      box-shadow: 0 4px 12px rgba(255, 42, 109, 0.3);
    }

    .flow-step-item h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

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

    /* 案例展示区 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

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

    .case-media-box {
      width: 100%;
      background: #f0f3f6;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .case-media-box img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }

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

    .case-body {
      padding: 22px;
    }

    .case-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 10px;
      border-radius: 4px;
      margin-bottom: 10px;
    }

    .case-body h4 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    /* 对比评测卡片与表格 */
    .review-highlight-box {
      background: #ffffff;
      border: 2px solid var(--primary);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-md);
      margin-bottom: 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }

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

    .score-circle {
      width: 90px;
      height: 90px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1.8rem;
      line-height: 1;
      box-shadow: 0 6px 18px rgba(255, 42, 109, 0.35);
    }

    .score-circle span {
      font-size: 0.75rem;
      font-weight: 500;
      opacity: 0.9;
    }

    .score-info h3 {
      font-size: 1.4rem;
      font-weight: 800;
      margin-bottom: 6px;
    }

    .stars {
      color: #ff9800;
      font-size: 1.2rem;
      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: 680px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }

    .compare-table th {
      background: #fff5f8;
      font-weight: 700;
      color: var(--text-main);
    }

    .compare-table td.highlight-cell {
      background: rgba(255, 42, 109, 0.03);
      font-weight: 700;
      color: var(--primary);
    }

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

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

    .testi-quote {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      position: relative;
    }

    .testi-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f2f2f2;
      padding-top: 14px;
    }

    .testi-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1rem;
    }

    .testi-meta h5 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

    /* 常见问题 FAQ 手风琴 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-question {
      padding: 18px 24px;
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      transition: var(--transition);
    }

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

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #ffffff;
    }

    .faq-answer-inner {
      padding: 0 24px 20px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 资讯与百科 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .news-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .news-card h4 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .news-links-list {
      display: flex;
      flex-direction: column;
      gap: 10px;
      margin-top: 14px;
    }

    .news-link-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 8px 12px;
      background: var(--primary-light);
      border-radius: 6px;
      font-size: 0.88rem;
      color: var(--primary);
      font-weight: 600;
    }

    .news-link-item:hover {
      background: #ffe3ec;
    }

    /* 需求匹配与联系我们表单 */
    .contact-container {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-info-col {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin: 20px 0;
    }

    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
    }

    .qr-card {
      display: inline-block;
      padding: 12px;
      background: var(--primary-light);
      border: 1px dashed var(--primary);
      border-radius: 8px;
      text-align: center;
      margin-top: 12px;
      max-width: 170px;
    }

    .qr-card img {
      width: 130px;
      height: 130px;
      display: block;
      margin: 0 auto 6px;
      border-radius: 4px;
    }

    .qr-card span {
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--primary);
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #dcdfe6;
      border-radius: 8px;
      font-size: 0.92rem;
      font-family: inherit;
      color: var(--text-main);
      background: #fdfdfd;
      transition: var(--transition);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(255, 42, 109, 0.15);
      background: #ffffff;
    }

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

    .btn-submit {
      width: 100%;
      padding: 14px;
      background: var(--primary-gradient);
      color: #ffffff;
      font-size: 1rem;
      font-weight: 700;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      box-shadow: 0 6px 18px rgba(255, 42, 109, 0.35);
      transition: var(--transition);
    }

    .btn-submit:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(255, 42, 109, 0.45);
    }

    /* 友情链接与页脚 */
    .site-footer {
      background: #181b22;
      color: #b0bac5;
      padding: 60px 0 30px;
      border-top: 3px solid var(--primary);
      font-size: 0.9rem;
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 18px;
      position: relative;
    }

    .footer-col h4::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: -6px;
      width: 28px;
      height: 2px;
      background: var(--primary);
    }

    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links a {
      color: #9aa8b6;
    }

    .footer-links a:hover {
      color: var(--primary);
      padding-left: 4px;
    }

    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .friend-links-box a {
      display: inline-block;
      background: #252a35;
      color: #c0ccd8;
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.82rem;
      transition: var(--transition);
    }

    .friend-links-box a:hover {
      background: var(--primary);
      color: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid #2a313e;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #7b8898;
    }

    /* 悬浮工具栏 */
    .floating-bar {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      color: var(--primary);
      font-size: 1.2rem;
      cursor: pointer;
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.08);
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .testimonial-grid {
        grid-template-columns: repeat(1, 1fr);
      }
      .contact-container {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
    }

    @media (max-width: 576px) {
      .hero-title {
        font-size: 1.8rem;
      }
      .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .flow-steps-grid {
        grid-template-columns: 1fr;
      }
      .case-grid {
        grid-template-columns: 1fr;
      }
      .news-grid {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
      .review-highlight-box {
        flex-direction: column;
        align-items: flex-start;
      }
    }