:root {
      --primary: #FFCC00;
      --primary-hover: #E6B800;
      --primary-light: #FFF8D6;
      --primary-gradient: linear-gradient(135deg, #FFE033 0%, #FFB700 100%);
      --dark: #12141A;
      --dark-card: #1A1D24;
      --text-main: #1E232E;
      --text-muted: #586174;
      --text-light: #8E98A8;
      --bg-page: #FDFDFB;
      --bg-alt: #F6F7F9;
      --border-color: #E8EBEF;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 10px 24px rgba(0,0,0,0.06);
      --shadow-hover: 0 16px 36px rgba(255,193,7,0.18);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 22px;
      --transition: all 0.28s ease;
    }

    * {
      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;
      overflow-x: hidden;
    }

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

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(253, 253, 251, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }

    .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;
      letter-spacing: -0.5px;
      color: var(--dark);
    }

    .brand-tag {
      background: var(--primary);
      font-size: 0.72rem;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 4px;
      color: var(--dark);
      margin-left: 6px;
    }

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

    .nav-links li a {
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
    }

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

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

    .btn-header {
      background: var(--primary);
      color: var(--dark);
      font-weight: 700;
      padding: 9px 20px;
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(255, 204, 0, 0.35);
      border: 1px solid rgba(0,0,0,0.06);
    }

    .btn-header:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }

    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--dark);
      padding: 4px;
    }

    /* 醒目黄色主视觉 首屏（无图片） */
    .hero-section {
      background: radial-gradient(circle at 50% 20%, #FFFDF0 0%, #FAF6E3 60%, #F5EFC7 100%);
      padding: 70px 0 60px;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

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

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #FFFFFF;
      border: 2px solid var(--primary);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-badge .dot {
      width: 8px;
      height: 8px;
      background-color: #10B981;
      border-radius: 50%;
      display: inline-block;
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--dark);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 34px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .btn-main-official {
      background: var(--primary-gradient);
      color: var(--dark);
      font-size: 1.12rem;
      font-weight: 800;
      padding: 16px 36px;
      border-radius: 12px;
      box-shadow: 0 10px 24px rgba(255, 183, 0, 0.45);
      border: 2px solid #111827;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .btn-main-official:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 14px 30px rgba(255, 183, 0, 0.6);
    }

    .btn-secondary {
      background: #FFFFFF;
      color: var(--dark);
      font-size: 1.05rem;
      font-weight: 700;
      padding: 16px 30px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-stat-card {
      background: #FFFFFF;
      border: 1px solid #E6D99C;
      border-top: 4px solid var(--primary);
      padding: 20px 14px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      text-align: center;
    }

    .hero-stat-card .val {
      font-size: 1.7rem;
      font-weight: 900;
      color: var(--dark);
      margin-bottom: 4px;
    }

    .hero-stat-card .lbl {
      font-size: 0.82rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 通用Section */
    .section-wrap {
      padding: 80px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-wrap.alt-bg {
      background-color: var(--bg-alt);
    }

    .section-header {
      text-align: center;
      max-width: 740px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      background: var(--primary);
      color: var(--dark);
      font-size: 0.8rem;
      font-weight: 800;
      padding: 4px 12px;
      border-radius: 20px;
      text-transform: uppercase;
      margin-bottom: 12px;
    }

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

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

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

    .model-chip {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 30px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--dark);
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
      transition: var(--transition);
    }

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

    /* 服务网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

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

    .service-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: var(--primary-light);
      border: 1px solid var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
      font-weight: 800;
      color: var(--dark);
    }

    .service-card h3 {
      font-size: 1.22rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--dark);
    }

    .service-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

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

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

    .step-number {
      font-size: 2rem;
      font-weight: 900;
      color: var(--primary);
      opacity: 0.9;
      line-height: 1;
      margin-bottom: 12px;
    }

    .process-step h3 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    /* 案例展示区 */
    .cases-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-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .case-img-wrap {
      width: 100%;
      height: 200px;
      background: #EAEEF3;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .case-body {
      padding: 20px;
    }

    .case-body h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .case-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-bottom: 14px;
    }

    .case-badge {
      display: inline-block;
      padding: 3px 8px;
      background: var(--bg-alt);
      border-radius: 4px;
      font-size: 0.78rem;
      font-weight: 600;
      color: var(--text-muted);
    }

    /* 评测与对比表格 */
    .compare-box {
      background: #FFFFFF;
      border: 2px solid var(--primary);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .score-summary-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: var(--primary-light);
      padding: 18px 24px;
      border-radius: var(--radius-md);
      margin-bottom: 28px;
    }

    .score-title-group h3 {
      font-size: 1.3rem;
      font-weight: 800;
      color: var(--dark);
    }

    .score-stars {
      color: #E6A200;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }

    .score-digits {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--dark);
    }

    .score-digits span {
      font-size: 1.1rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    .compare-table-responsive {
      width: 100%;
      overflow-x: auto;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }

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

    .compare-table th {
      background: var(--bg-alt);
      font-weight: 700;
      color: var(--dark);
    }

    .compare-table td.highlight {
      background: rgba(255, 204, 0, 0.1);
      font-weight: 700;
      color: var(--dark);
    }

    /* 需求匹配表单与联系 */
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      align-items: start;
    }

    .contact-info-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .contact-info-item {
      display: flex;
      align-items: flex-start;
      gap: 16px;
      margin-bottom: 22px;
    }

    .contact-info-item:last-child {
      margin-bottom: 0;
    }

    .qr-box {
      margin-top: 24px;
      padding: 18px;
      background: var(--bg-alt);
      border-radius: var(--radius-md);
      text-align: center;
      border: 1px dashed var(--border-color);
    }

    .qr-box img {
      width: 130px;
      height: 130px;
      display: block;
      margin: 0 auto 10px;
      border-radius: 6px;
    }

    .form-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-top: 5px solid var(--primary);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-md);
    }

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

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

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      transition: var(--transition);
      background: #FFFFFF;
      color: var(--text-main);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(255, 204, 0, 0.25);
    }

    .btn-submit {
      width: 100%;
      background: var(--primary-gradient);
      color: var(--dark);
      font-size: 1.05rem;
      font-weight: 800;
      padding: 14px;
      border: 2px solid #111827;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: var(--transition);
    }

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

    /* 评论板块 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

    .review-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;
    }

    .review-stars {
      color: #E6A200;
      font-size: 0.9rem;
      margin-bottom: 12px;
    }

    .review-text {
      font-size: 0.92rem;
      color: var(--text-main);
      line-height: 1.65;
      margin-bottom: 18px;
    }

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

    .reviewer-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: var(--dark);
      font-size: 0.9rem;
    }

    .reviewer-name {
      font-weight: 700;
      font-size: 0.92rem;
    }

    .reviewer-role {
      font-size: 0.78rem;
      color: var(--text-muted);
    }

    /* FAQ 展开面板 */
    .faq-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 18px;
    }

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item.active {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 20px;
      font-weight: 700;
      font-size: 1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      background: #FFFFFF;
    }

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.28s ease;
      color: var(--dark);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 20px;
      color: var(--text-muted);
      font-size: 0.9rem;
      line-height: 1.6;
      background: #FFFDF7;
    }

    .faq-item.active .faq-answer {
      padding: 0 20px 18px 20px;
      max-height: 200px;
    }

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

    .article-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
    }

    .article-box h3 {
      font-size: 1.18rem;
      font-weight: 700;
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .article-list {
      list-style: none;
    }

    .article-list li {
      padding: 10px 0;
      border-bottom: 1px dashed var(--border-color);
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 0.9rem;
    }

    .article-list li:last-child {
      border-bottom: none;
    }

    .article-list li a:hover {
      color: #B28900;
      text-decoration: underline;
    }

    /* 宣传条 */
    .promo-banner-wrap {
      margin: 40px 0 0;
      text-align: center;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .promo-banner-wrap .ai-page-image {
      display: block;
      width: 100%;
      height: auto;
    }

    /* 页脚与友情链接 */
    .site-footer {
      background: #11141A;
      color: #A0AEC0;
      padding: 60px 0 30px;
      font-size: 0.9rem;
    }

    .footer-top {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 32px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 16px;
      position: relative;
      padding-bottom: 8px;
    }

    .footer-col h4::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 24px;
      height: 3px;
      background: var(--primary);
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links li a:hover {
      color: var(--primary);
    }

    .friend-links-section {
      border-top: 1px solid #242933;
      padding: 24px 0;
      margin-bottom: 24px;
    }

    .friend-links-title {
      color: #FFFFFF;
      font-size: 0.9rem;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .friend-links-wrap a {
      color: #8C99A8;
      font-size: 0.84rem;
      transition: var(--transition);
    }

    .friend-links-wrap a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid #1C222C;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.82rem;
      color: #6C7A8C;
    }

    .footer-bottom a {
      color: #8C99A8;
    }

    /* 浮动客服 */
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: var(--dark);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      box-shadow: 0 4px 16px rgba(0,0,0,0.2);
      cursor: pointer;
      transition: var(--transition);
      border: 2px solid #FFFFFF;
    }

    .float-btn:hover {
      transform: scale(1.1);
      background: var(--primary-hover);
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .services-grid, .cases-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline, .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-layout {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .services-grid, .cases-grid, .reviews-grid, .articles-grid, .faq-grid {
        grid-template-columns: 1fr;
      }
      .process-timeline, .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }