/* 全局变量定义：鲜黄耀眼风 (Vibrant Yellow Style) */
    :root {
      --primary-yellow: #FFC700;
      --primary-yellow-hover: #E6B200;
      --primary-yellow-light: #FFF9E6;
      --accent-dark: #18181B;
      --text-main: #27272A;
      --text-muted: #71717A;
      --bg-main: #FAFAFA;
      --bg-card: #FFFFFF;
      --border-color: #E4E4E7;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 28px rgba(255,199,0,0.18);
      --container-width: 1200px;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
    }

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

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    /* 容器布局规范 */
    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    .section-padding {
      padding: 80px 0;
    }

    .bg-white {
      background-color: var(--bg-card);
    }

    .bg-light {
      background-color: var(--bg-main);
    }

    .bg-yellow-soft {
      background-color: var(--primary-yellow-light);
    }

    /* 标题规范 */
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      background-color: var(--primary-yellow);
      color: var(--accent-dark);
      font-weight: 700;
      font-size: 13px;
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--accent-dark);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 15px;
      font-weight: 700;
      border-radius: 8px;
      cursor: pointer;
      border: 2px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary-yellow);
      color: var(--accent-dark);
      box-shadow: 0 4px 14px rgba(255, 199, 0, 0.4);
    }

    .btn-primary:hover {
      background-color: var(--primary-yellow-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 199, 0, 0.5);
    }

    .btn-dark {
      background-color: var(--accent-dark);
      color: #FFFFFF;
    }

    .btn-dark:hover {
      background-color: #27272A;
      transform: translateY(-2px);
    }

    .btn-outline {
      border-color: var(--accent-dark);
      color: var(--accent-dark);
      background: transparent;
    }

    .btn-outline:hover {
      background-color: var(--accent-dark);
      color: #FFFFFF;
    }

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

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

    .logo-box {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

    /* 严格要求的 CSS: .nav-links 必须 gap:0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

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

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

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

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--accent-dark);
    }

    /* 首屏 HERO 区域 (严格规定：不得出现任何图片，包含醒目官网访问按钮) */
    .hero-section {
      padding: 90px 0 70px;
      background: linear-gradient(180deg, #FFFDF0 0%, #FAFAFA 100%);
      text-align: center;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #FFFFFF;
      border: 1px solid var(--primary-yellow);
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 700;
      color: var(--accent-dark);
      margin-bottom: 24px;
      box-shadow: 0 4px 12px rgba(255, 199, 0, 0.15);
    }

    .hero-title {
      font-size: 42px;
      font-weight: 900;
      color: var(--accent-dark);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.6;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    .btn-hero-main {
      font-size: 16px;
      padding: 14px 36px;
      background-color: var(--primary-yellow);
      color: var(--accent-dark);
      border-radius: 8px;
      font-weight: 800;
      box-shadow: 0 6px 20px rgba(255, 199, 0, 0.45);
      border: 2px solid var(--primary-yellow);
    }

    .btn-hero-main:hover {
      background-color: var(--primary-yellow-hover);
      transform: translateY(-2px);
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
      background: #FFFFFF;
      padding: 24px;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .stat-item h3 {
      font-size: 28px;
      font-weight: 900;
      color: var(--accent-dark);
    }

    .stat-item h3 span {
      color: var(--primary-yellow-hover);
    }

    .stat-item p {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 600;
      margin-top: 4px;
    }

    /* 平台介绍 & 大模型标签云 */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .intro-text-block h3 {
      font-size: 26px;
      font-weight: 800;
      margin-bottom: 16px;
      color: var(--accent-dark);
    }

    .intro-text-block p {
      font-size: 15px;
      color: var(--text-muted);
      margin-bottom: 20px;
    }

    .model-tags-container {
      background: #FFFFFF;
      padding: 30px;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .model-tags-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--accent-dark);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .model-tag {
      background: var(--bg-main);
      border: 1px solid var(--border-color);
      padding: 6px 12px;
      border-radius: 6px;
      font-size: 12px;
      font-weight: 600;
      color: var(--accent-dark);
      transition: var(--transition);
    }

    .model-tag:hover {
      background-color: var(--primary-yellow);
      border-color: var(--primary-yellow);
    }

    /* 服务能力 & 一站式制作场景卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 28px;
      border-radius: 12px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-yellow);
    }

    .service-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-yellow-light);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      margin-bottom: 16px;
      color: var(--accent-dark);
      font-weight: bold;
    }

    .service-card h4 {
      font-size: 18px;
      font-weight: 700;
      color: var(--accent-dark);
      margin-bottom: 8px;
    }

    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 行业方案与服务网络 */
    .network-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .network-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 24px;
      border-radius: 12px;
      text-align: center;
    }

    .network-card h5 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--accent-dark);
    }

    .network-card p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 标准流程 (Step Card) */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .step-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 24px;
      border-radius: 12px;
      position: relative;
    }

    .step-num {
      font-size: 32px;
      font-weight: 900;
      color: var(--primary-yellow);
      margin-bottom: 10px;
      line-height: 1;
    }

    .step-card h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 13px;
      color: var(--text-muted);
    }

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

    .case-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .case-img-wrap {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background-color: #E2E8F0;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.05);
    }

    .case-info {
      padding: 20px;
    }

    .case-info h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .case-info p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 对比评测表格 (五星 / 9.9分 / 满分10分) */
    .eval-box {
      background: #FFFFFF;
      border: 2px solid var(--primary-yellow);
      border-radius: 16px;
      padding: 40px;
      box-shadow: 0 8px 24px rgba(255, 199, 0, 0.12);
    }

    .eval-header-summary {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: var(--primary-yellow-light);
      padding: 20px 30px;
      border-radius: 12px;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 16px;
    }

    .eval-score-badge {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .score-num {
      font-size: 40px;
      font-weight: 900;
      color: var(--accent-dark);
    }

    .score-num span {
      font-size: 20px;
      color: var(--text-muted);
      font-weight: 500;
    }

    .stars-rate {
      color: #FF9500;
      font-size: 22px;
      letter-spacing: 2px;
    }

    .eval-table-wrapper {
      width: 100%;
      overflow-x: auto;
    }

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

    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

    .eval-table th {
      background-color: var(--bg-main);
      font-weight: 700;
      color: var(--accent-dark);
    }

    .eval-table td.highlight {
      font-weight: 700;
      color: var(--accent-dark);
      background-color: rgba(255, 199, 0, 0.08);
    }

    /* Token 比价 */
    .token-table-wrapper {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      overflow: hidden;
    }

    .token-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 600px;
    }

    .token-table th, .token-table td {
      padding: 14px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

    .token-table th {
      background-color: var(--bg-main);
      font-weight: 700;
    }

    .price-tag {
      display: inline-block;
      padding: 2px 8px;
      background-color: #DCFCE7;
      color: #166534;
      font-weight: 700;
      font-size: 12px;
      border-radius: 4px;
    }

    /* 加盟代理模块 */
    .partner-banner {
      background: linear-gradient(135deg, var(--accent-dark) 0%, #27272A 100%);
      color: #FFFFFF;
      border-radius: 16px;
      padding: 50px;
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 30px;
      align-items: center;
    }

    .partner-banner h3 {
      font-size: 30px;
      font-weight: 800;
      margin-bottom: 14px;
      color: var(--primary-yellow);
    }

    .partner-banner p {
      font-size: 15px;
      color: #D4D4D8;
      margin-bottom: 24px;
    }

    /* 帮助中心, AI百科 & 文章列表 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .article-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 20px;
      border-radius: 10px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .article-card h5 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .article-card a {
      color: var(--accent-dark);
    }

    .article-card a:hover {
      color: var(--primary-yellow-hover);
    }

    /* FAQ 折叠面板 (>=10 items) */
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--accent-dark);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .faq-question::after {
      content: '+';
      font-size: 20px;
      font-weight: 400;
      transition: var(--transition);
    }

    .faq-item.active .faq-question::after {
      content: '−';
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background-color: var(--bg-main);
      border-top: 1px solid transparent;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      border-top-color: var(--border-color);
    }

    .faq-answer-inner {
      padding: 18px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 客户评论卡片 (6条) */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 24px;
      border-radius: 12px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-text {
      font-size: 14px;
      color: var(--text-main);
      margin-bottom: 20px;
      font-style: italic;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

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

    .author-info h5 {
      font-size: 14px;
      font-weight: 700;
      color: var(--accent-dark);
    }

    .author-info p {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 联系我们与需求提交表单 (?s=index/submitForm) */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }

    .contact-info-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 36px;
      border-radius: 16px;
    }

    .contact-info-card h3 {
      font-size: 24px;
      font-weight: 800;
      margin-bottom: 20px;
    }

    .contact-list {
      list-style: none;
      margin-bottom: 30px;
    }

    .contact-list li {
      margin-bottom: 14px;
      font-size: 15px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .contact-qr {
      width: 140px;
      padding: 10px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      background: #FFFFFF;
    }

    .form-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 36px;
      border-radius: 16px;
    }

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

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--accent-dark);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 14px;
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--primary-yellow-hover);
      box-shadow: 0 0 0 3px rgba(255, 199, 0, 0.2);
    }

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

    /* 页脚 */
    .site-footer {
      background-color: #18181B;
      color: #A1A1AA;
      padding: 60px 0 30px;
      font-size: 14px;
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      padding-bottom: 40px;
      border-bottom: 1px solid #27272A;
    }

    .footer-brand p {
      margin-top: 14px;
      font-size: 13px;
      line-height: 1.6;
    }

    .footer-col h5 {
      color: #FFFFFF;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .footer-col ul {
      list-style: none;
    }

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

    .footer-col ul li a:hover {
      color: var(--primary-yellow);
    }

    .friendly-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }

    .friendly-links a {
      color: #A1A1AA;
      font-size: 13px;
    }

    .friendly-links a:hover {
      color: var(--primary-yellow);
    }

    .footer-bottom {
      padding-top: 30px;
      text-align: center;
      font-size: 13px;
    }

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

    .cs-btn {
      width: 50px;
      height: 50px;
      background: var(--primary-yellow);
      color: var(--accent-dark);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      box-shadow: 0 4px 14px rgba(0,0,0,0.15);
      cursor: pointer;
      position: relative;
    }

    .cs-qr-pop {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #FFFFFF;
      padding: 12px;
      border-radius: 8px;
      box-shadow: 0 10px 25px rgba(0,0,0,0.15);
      width: 150px;
      text-align: center;
    }

    .cs-btn:hover .cs-qr-pop {
      display: block;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .services-grid, .cases-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .network-grid, .process-steps, .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .intro-grid, .partner-banner, .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .header-actions {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .services-grid, .cases-grid, .reviews-grid, .network-grid, .process-steps, .news-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 28px;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
    }