:root {
      --primary: #f59e0b;
      --primary-bright: #fbbf24;
      --primary-dark: #b45309;
      --primary-subtle: #fef3c7;
      --bg-page: #fdfdfc;
      --bg-surface: #ffffff;
      --bg-alt: #fbf8ef;
      --text-main: #18181b;
      --text-muted: #52525b;
      --text-light: #71717a;
      --border-color: #f3e8c8;
      --shadow-sm: 0 2px 8px rgba(245, 158, 11, 0.08);
      --shadow-md: 0 8px 24px rgba(180, 83, 9, 0.08);
      --shadow-lg: 0 16px 36px rgba(180, 83, 9, 0.12);
      --radius: 12px;
      --radius-sm: 6px;
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      background-image: radial-gradient(#fef08a 0.6px, transparent 0.6px);
      background-size: 24px 24px;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 顶部导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(10px);
      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-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-wrap .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      text-decoration: none;
      color: var(--text-muted);
      font-size: 0.95rem;
      font-weight: 500;
      padding: 8px 12px;
      transition: color 0.2s, background-color 0.2s;
      border-radius: var(--radius-sm);
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary-dark);
      background-color: var(--primary-subtle);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-main-site {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 8px 18px;
      background-color: var(--primary);
      color: #000;
      font-weight: 700;
      border-radius: var(--radius-sm);
      text-decoration: none;
      transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s;
      box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
      border: 1px solid var(--primary-bright);
    }
    .btn-main-site:hover {
      background-color: var(--primary-bright);
      transform: translateY(-1px);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-main);
      padding: 4px;
    }
    /* Hero首屏 - 严格无图 */
    .hero-section {
      padding: 72px 0 60px;
      background: linear-gradient(180deg, #fffbeb 0%, #fef3c7 40%, var(--bg-page) 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
    }
    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background-color: #fff;
      color: var(--primary-dark);
      border: 1px solid #fde68a;
      padding: 6px 16px;
      border-radius: 999px;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }
    .hero-title {
      font-size: clamp(2rem, 4vw, 3rem);
      line-height: 1.25;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-title span {
      color: var(--primary-dark);
      position: relative;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 720px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
    }
    .btn-hero-primary {
      padding: 14px 32px;
      font-size: 1.05rem;
      font-weight: 700;
      color: #000;
      background: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);
      border: 1px solid #d97706;
      border-radius: var(--radius);
      text-decoration: none;
      box-shadow: 0 8px 20px rgba(245, 158, 11, 0.35);
      transition: all 0.25s;
    }
    .btn-hero-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(245, 158, 11, 0.45);
    }
    .btn-hero-secondary {
      padding: 14px 28px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      text-decoration: none;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s;
    }
    .btn-hero-secondary:hover {
      background: var(--primary-subtle);
      border-color: #fcd34d;
    }
    .hero-stats-panel {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      background: #ffffff;
      padding: 24px;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .stat-item {
      text-align: center;
      padding: 8px;
      border-right: 1px dashed var(--border-color);
    }
    .stat-item:last-child {
      border-right: none;
    }
    .stat-num {
      font-size: 1.85rem;
      font-weight: 900;
      color: var(--primary-dark);
      display: block;
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 0.88rem;
      color: var(--text-light);
      font-weight: 500;
    }
    /* 公用 Section 结构 */
    .site-section {
      padding: 80px 0;
      border-bottom: 1px solid #f2ecdd;
    }
    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 50px;
    }
    .section-eyebrow {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary-dark);
      text-transform: uppercase;
      letter-spacing: 1px;
      display: block;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }
    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
    }
    /* 卡片通用 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #fde68a;
    }
    /* 服务能力卡片 */
    .service-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .service-card h3::before {
      content: "";
      width: 6px;
      height: 18px;
      background: var(--primary);
      border-radius: 4px;
      display: inline-block;
    }
    .service-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.55;
    }
    /* 平台矩阵标签云 */
    .model-chips {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }
    .model-chip {
      background: #ffffff;
      border: 1px solid #eedda9;
      padding: 8px 16px;
      border-radius: 999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 1px 3px rgba(0,0,0,0.03);
    }
    /* 评测板块 */
    .eval-container {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .eval-score-header {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      padding-bottom: 30px;
      border-bottom: 1px solid #f1e9d2;
      margin-bottom: 32px;
    }
    .score-badge {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .score-num {
      font-size: 3.2rem;
      font-weight: 900;
      color: var(--primary-dark);
      line-height: 1;
    }
    .score-total {
      font-size: 1.1rem;
      color: var(--text-light);
      font-weight: 600;
    }
    .rating-stars {
      color: #f59e0b;
      font-size: 1.3rem;
      font-weight: 700;
      margin-top: 4px;
    }
    .eval-table-wrap {
      overflow-x: auto;
    }
    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f3eedc;
      font-size: 0.95rem;
    }
    .eval-table th {
      background: var(--primary-subtle);
      color: var(--primary-dark);
      font-weight: 700;
    }
    .eval-table tr:hover td {
      background: #fffdf5;
    }
    .eval-table td:last-child {
      color: var(--primary-dark);
      font-weight: 600;
    }
    /* 步骤流程 */
    .step-item {
      position: relative;
      text-align: center;
      padding: 24px;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
    }
    .step-idx {
      width: 44px;
      height: 44px;
      background: #fef3c7;
      color: var(--primary-dark);
      font-weight: 900;
      font-size: 1.2rem;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      margin: 0 auto 16px;
      border: 1px solid #fcd34d;
    }
    .step-item h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    /* 案例展示 */
    .case-card {
      background: #fff;
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .case-media {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #f4ede0;
      overflow: hidden;
    }
    .case-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }
    .case-media.square {
      aspect-ratio: 1 / 1;
    }
    .case-body {
      padding: 20px;
    }
    .case-body h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .case-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }
    /* 用户评论 */
    .comment-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .comment-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
    }
    .comment-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f8f3e5;
      padding-top: 14px;
    }
    .avatar-initial {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: var(--primary-subtle);
      color: var(--primary-dark);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
    }
    .author-info h5 {
      font-size: 0.95rem;
      font-weight: 700;
    }
    .author-info span {
      font-size: 0.8rem;
      color: var(--text-light);
    }
    /* FAQ折叠 */
    .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-sm);
      overflow: hidden;
      transition: border-color 0.2s;
    }
    .faq-item:hover {
      border-color: #fcd34d;
    }
    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-icon {
      font-size: 1.25rem;
      color: var(--primary-dark);
      transition: transform 0.2s;
    }
    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* 需求表单与联系方式 */
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      align-items: flex-start;
    }
    .contact-info-panel {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
    }
    .contact-info-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin: 24px 0;
    }
    .contact-info-list li {
      font-size: 0.95rem;
      color: var(--text-muted);
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .contact-info-list strong {
      color: var(--text-main);
      min-width: 80px;
    }
    .qr-container {
      margin-top: 24px;
      padding: 16px;
      background: var(--bg-alt);
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      text-align: center;
    }
    .qr-container img {
      max-width: 140px;
      height: auto;
      display: block;
      margin: 0 auto 8px;
      border-radius: 4px;
    }
    .qr-desc {
      font-size: 0.85rem;
      color: var(--text-light);
      font-weight: 500;
    }
    .form-panel {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-group label {
      display: block;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #e4d8ba;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background-color: #fff;
      outline: none;
      transition: border-color 0.2s;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }
    .btn-submit {
      width: 100%;
      padding: 14px;
      background: var(--primary);
      color: #000;
      font-size: 1rem;
      font-weight: 700;
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: background-color 0.2s, transform 0.1s;
    }
    .btn-submit:hover {
      background: var(--primary-bright);
      transform: translateY(-1px);
    }
    /* 资讯与动态 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .article-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      text-decoration: none;
      color: var(--text-main);
      transition: all 0.2s;
    }
    .article-item:hover {
      background: var(--primary-subtle);
      border-color: #fcd34d;
      transform: translateX(4px);
    }
    .article-item span {
      font-weight: 600;
      font-size: 0.95rem;
    }
    .article-item em {
      font-style: normal;
      font-size: 0.85rem;
      color: var(--primary-dark);
      font-weight: 700;
    }
    /* 底部通用规范 */
    footer.site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 30px;
      color: var(--text-muted);
    }
    .footer-layout {
      display: flex;
      flex-direction: column;
      gap: 30px;
    }
    .footer-top {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: flex-start;
      gap: 24px;
    }
    .footer-brand {
      max-width: 360px;
    }
    .footer-brand .ai-page-logo {
      height: 36px;
      width: auto;
      margin-bottom: 12px;
      display: block;
    }
    .footer-brand p {
      font-size: 0.88rem;
      color: var(--text-light);
      line-height: 1.5;
    }
    .footer-links-group {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .footer-links-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }
    .friend-links-box a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.88rem;
      transition: color 0.2s;
    }
    .friend-links-box a:hover {
      color: var(--primary-dark);
      text-decoration: underline;
    }
    .footer-bottom {
      border-top: 1px solid #f3eedc;
      padding-top: 24px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
      font-size: 0.85rem;
      color: var(--text-light);
    }
    .footer-bottom a {
      color: var(--text-light);
      text-decoration: none;
    }
    .footer-bottom a:hover {
      color: var(--primary-dark);
    }
    /* 浮动客服 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 24px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }
    .floating-btn {
      width: 48px;
      height: 48px;
      background: var(--primary);
      border: 1px solid var(--primary-bright);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      text-decoration: none;
      color: #000;
      font-weight: bold;
      font-size: 1.1rem;
      transition: transform 0.2s;
    }
    .floating-btn:hover {
      transform: scale(1.06);
    }
    /* 响应式适配 */
    @media (max-width: 992px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-layout {
        grid-template-columns: 1fr;
      }
      .hero-stats-panel {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
      }
      .stat-item:nth-child(2) {
        border-right: none;
      }
    }
    @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;
        align-items: stretch;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        padding: 16px 20px;
      }
      .nav-links.show {
        display: flex;
      }
      .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .hero-stats-panel {
        grid-template-columns: 1fr;
      }
      .stat-item {
        border-right: none;
        border-bottom: 1px dashed var(--border-color);
        padding-bottom: 12px;
      }
      .stat-item:last-child {
        border-bottom: none;
      }
    }