:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --bg-alt: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --neon-cyan: #06b6d4;
      --neon-green: #10b981;
      --neon-purple: #8b5cf6;
      --neon-pink: #ec4899;
      --accent-glow: linear-gradient(135deg, #06b6d4 0%, #3b82f6 50%, #8b5cf6 100%);
      --card-border: rgba(14, 165, 233, 0.18);
      --card-shadow: 0 10px 30px -10px rgba(6, 182, 212, 0.12), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
      --card-shadow-hover: 0 20px 35px -10px rgba(6, 182, 212, 0.25), 0 0 15px rgba(16, 185, 129, 0.2);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-width: 1200px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

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

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

    /* 炫彩荧光氛围背景底纹 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: 
        radial-gradient(circle at 10% 15%, rgba(6, 182, 212, 0.07) 0%, transparent 35%),
        radial-gradient(circle at 90% 40%, rgba(139, 92, 246, 0.06) 0%, transparent 35%),
        radial-gradient(circle at 50% 80%, rgba(16, 185, 129, 0.05) 0%, transparent 40%);
      pointer-events: none;
      z-index: -1;
    }

    /* 容器统一标准 */
    .container {
      width: 100%;
      max-width: var(--container-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

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

    /* 导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(6, 182, 212, 0.15);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    }

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

    .brand-group {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      background: linear-gradient(120deg, #0f172a, #0284c7);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover {
      color: var(--neon-cyan);
      background: rgba(6, 182, 212, 0.08);
    }

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

    .btn-glow {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      border-radius: 999px;
      font-size: 0.9rem;
      font-weight: 600;
      color: #ffffff;
      background: var(--accent-glow);
      box-shadow: 0 4px 15px rgba(6, 182, 212, 0.35);
      border: none;
      cursor: pointer;
      position: relative;
      overflow: hidden;
      transition: var(--transition);
    }

    .btn-glow:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 22px rgba(6, 182, 212, 0.5);
      color: #ffffff;
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 18px;
      border-radius: 999px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      background: #ffffff;
      border: 1px solid rgba(6, 182, 212, 0.3);
      transition: var(--transition);
    }

    .btn-outline:hover {
      border-color: var(--neon-cyan);
      background: rgba(6, 182, 212, 0.05);
      color: var(--neon-cyan);
    }

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

    /* 首屏 Hero - 无图片约束 */
    .hero-section {
      padding: 80px 0 60px;
      position: relative;
    }

    .hero-wrapper {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      border-radius: 999px;
      background: rgba(6, 182, 212, 0.1);
      border: 1px solid rgba(6, 182, 212, 0.3);
      color: #0284c7;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: 0 0 15px rgba(6, 182, 212, 0.15);
    }

    .hero-badge::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--neon-green);
      box-shadow: 0 0 8px var(--neon-green);
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 760px;
      margin-bottom: 36px;
      line-height: 1.7;
    }

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

    .hero-cta-main {
      padding: 14px 36px;
      font-size: 1.05rem;
      letter-spacing: 0.5px;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      width: 100%;
      margin-top: 10px;
    }

    .metric-card {
      background: var(--bg-card);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 22px 16px;
      text-align: center;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(6, 182, 212, 0.4);
    }

    .metric-num {
      font-size: 1.85rem;
      font-weight: 800;
      color: #0284c7;
      display: block;
      margin-bottom: 4px;
      font-family: Arial, sans-serif;
    }

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

    /* 通用章节样式 */
    .section-wrap {
      padding: 70px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: #0284c7;
      background: rgba(6, 182, 212, 0.08);
      padding: 4px 12px;
      border-radius: 6px;
      margin-bottom: 12px;
      border: 1px solid rgba(6, 182, 212, 0.2);
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 平台介绍 & 核心能力 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: stretch;
    }

    .about-card {
      background: var(--bg-card);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--card-shadow);
    }

    .model-tags-box {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 20px;
    }

    .model-tag {
      font-size: 0.78rem;
      font-weight: 600;
      padding: 5px 12px;
      background: #f8fafc;
      border: 1px solid rgba(14, 165, 233, 0.2);
      border-radius: 999px;
      color: #0369a1;
      transition: var(--transition);
    }

    .model-tag:hover {
      background: rgba(6, 182, 212, 0.15);
      border-color: var(--neon-cyan);
      transform: scale(1.04);
    }

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

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

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      position: relative;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(6, 182, 212, 0.45);
    }

    .feature-icon-box {
      width: 46px;
      height: 46px;
      border-radius: 12px;
      background: rgba(6, 182, 212, 0.1);
      border: 1px solid rgba(6, 182, 212, 0.3);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      color: #0284c7;
      font-size: 1.3rem;
      font-weight: 700;
    }

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

    .feature-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      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-card {
      background: var(--bg-card);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      text-align: center;
      box-shadow: var(--card-shadow);
      position: relative;
      transition: var(--transition);
    }

    .step-card:hover {
      border-color: var(--neon-cyan);
      transform: translateY(-4px);
    }

    .step-badge {
      width: 32px;
      height: 32px;
      background: var(--accent-glow);
      color: #ffffff;
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.85rem;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .step-title {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .step-desc {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* 素材案例展示区 */
    .showcase-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      align-items: stretch;
    }

    .showcase-img-card {
      background: var(--bg-card);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 20px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .img-frame {
      width: 100%;
      border-radius: var(--radius-md);
      overflow: hidden;
      background: #e2e8f0;
      position: relative;
      margin-bottom: 16px;
    }

    .img-frame img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.4s ease;
    }

    .showcase-img-card:hover .img-frame img {
      transform: scale(1.02);
    }

    .img-info-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .img-info-text {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 对比评测表格 */
    .compare-container {
      background: var(--bg-card);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--card-shadow);
      overflow-x: auto;
    }

    .score-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      padding: 20px 24px;
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.08), rgba(139, 92, 246, 0.08));
      border: 1px solid rgba(6, 182, 212, 0.25);
      border-radius: var(--radius-md);
      margin-bottom: 28px;
    }

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

    .score-val {
      font-size: 2.2rem;
      font-weight: 900;
      color: #0284c7;
      font-family: Arial, sans-serif;
    }

    .stars-box {
      color: #f59e0b;
      font-size: 1.1rem;
      letter-spacing: 2px;
    }

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .custom-table th, .custom-table td {
      padding: 16px 18px;
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      font-size: 0.92rem;
    }

    .custom-table th {
      background: #f8fafc;
      color: var(--text-main);
      font-weight: 700;
    }

    .highlight-col {
      background: rgba(6, 182, 212, 0.04);
      font-weight: 600;
      color: #0369a1;
    }

    /* 需求匹配与表单 */
    .form-box {
      background: var(--bg-card);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--card-shadow);
      max-width: 780px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .form-group.full {
      grid-column: span 2;
    }

    .form-group label {
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid #cbd5e1;
      font-size: 0.92rem;
      outline: none;
      transition: var(--transition);
      background: #f8fafc;
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--neon-cyan);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
    }

    textarea.form-control {
      min-height: 110px;
      resize: vertical;
    }

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

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      user-select: none;
    }

    .faq-question::after {
      content: "+";
      font-size: 1.3rem;
      font-weight: 400;
      color: #0284c7;
      transition: transform 0.25s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.65;
      background: #fcfdfe;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px;
      border-top: 1px dashed rgba(226, 232, 240, 0.8);
    }

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

    .review-card {
      background: var(--bg-card);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }

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

    .review-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .avatar-placeholder {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, #06b6d4, #8b5cf6);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
    }

    .review-name {
      font-size: 0.95rem;
      font-weight: 700;
    }

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

    .review-body {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 文章与资讯 */
    .article-box {
      background: var(--bg-card);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--card-shadow);
    }

    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-link-item {
      padding: 8px 16px;
      background: #f8fafc;
      border: 1px solid rgba(6, 182, 212, 0.2);
      border-radius: var(--radius-sm);
      font-size: 0.88rem;
      color: #0369a1;
      transition: var(--transition);
    }

    .article-link-item:hover {
      background: rgba(6, 182, 212, 0.1);
      border-color: var(--neon-cyan);
    }

    /* 合作联系板块 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    .contact-info-card {
      background: var(--bg-card);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--card-shadow);
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 18px;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .contact-icon {
      width: 38px;
      height: 38px;
      border-radius: 8px;
      background: rgba(6, 182, 212, 0.1);
      color: #0284c7;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    .qr-container {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
      background: #f8fafc;
      border: 1px dashed rgba(6, 182, 212, 0.35);
      border-radius: var(--radius-md);
      padding: 24px;
    }

    .qr-container img {
      max-width: 150px;
      height: auto;
      border-radius: 8px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
      margin-bottom: 12px;
    }

    /* 页脚与友情链接 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid rgba(6, 182, 212, 0.15);
      padding: 40px 0 24px;
      color: var(--text-muted);
      font-size: 0.88rem;
    }

    .footer-inner {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 12px;
      padding-bottom: 20px;
      border-bottom: 1px solid #e2e8f0;
    }

    .friend-links-title {
      font-weight: 700;
      color: var(--text-main);
      margin-right: 8px;
    }

    .friend-links-box a {
      color: var(--text-muted);
      padding: 4px 10px;
      background: #f8fafc;
      border-radius: 4px;
      border: 1px solid #e2e8f0;
      font-size: 0.82rem;
    }

    .friend-links-box a:hover {
      color: var(--neon-cyan);
      border-color: var(--neon-cyan);
    }

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.82rem;
    }

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

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid rgba(6, 182, 212, 0.3);
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #0284c7;
      cursor: pointer;
      transition: var(--transition);
      font-size: 1.1rem;
    }

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

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .grid-3, .grid-4, .flow-steps, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .about-grid, .showcase-grid, .contact-grid {
        grid-template-columns: 1fr;
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.08);
        border-bottom: 1px solid rgba(6, 182, 212, 0.15);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        width: 100%;
        padding: 10px 0;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-3, .grid-4, .flow-steps, .reviews-grid, .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full {
        grid-column: span 1;
      }
      .hero-metrics {
        grid-template-columns: 1fr 1fr;
      }
    }