:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --primary: #0284c7;
      --primary-glow: #38bdf8;
      --neon-cyan: #06b6d4;
      --neon-purple: #8b5cf6;
      --neon-pink: #ec4899;
      --border-color: #e2e8f0;
      --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
      --card-shadow-hover: 0 12px 28px -4px rgba(6, 182, 212, 0.15), 0 4px 12px -2px rgba(139, 92, 246, 0.1);
      --container-max: 1200px;
    }

    * {
      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 {
      background: radial-gradient(circle at 10% 20%, rgba(6, 182, 212, 0.04) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(139, 92, 246, 0.04) 0%, transparent 40%),
                  var(--bg-main);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-box img.ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }
    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      background: linear-gradient(135deg, #0284c7, #8b5cf6);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      transition: all 0.25s ease;
      border-radius: 6px;
    }
    .nav-links li a:hover {
      color: var(--primary);
      background: rgba(2, 132, 199, 0.06);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-header-cta {
      background: linear-gradient(135deg, #06b6d4, #8b5cf6);
      color: #ffffff !important;
      text-decoration: none;
      padding: 8px 18px;
      border-radius: 9999px;
      font-size: 0.9rem;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
      transition: all 0.25s ease;
    }
    .btn-header-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(139, 92, 246, 0.4);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 炫彩荧光氛围饰条与徽章 */
    .badge-glow {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background: rgba(6, 182, 212, 0.1);
      border: 1px solid rgba(6, 182, 212, 0.3);
      border-radius: 9999px;
      color: #0284c7;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 20px;
    }
    .glow-dot {
      width: 8px;
      height: 8px;
      background-color: #06b6d4;
      border-radius: 50%;
      box-shadow: 0 0 8px #06b6d4;
      animation: pulseDot 2s infinite;
    }
    @keyframes pulseDot {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.4; transform: scale(0.8); }
    }

    /* Hero 首屏 (严格无图片) */
    .hero-section {
      padding: 80px 0 60px;
      text-align: center;
      position: relative;
    }
    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.02em;
    }
    .hero-title span {
      background: linear-gradient(135deg, #0284c7 0%, #8b5cf6 50%, #ec4899 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 36px;
    }
    .hero-btns {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .btn-main-glow {
      padding: 14px 32px;
      background: linear-gradient(135deg, #0284c7, #8b5cf6);
      color: #ffffff;
      text-decoration: none;
      font-size: 1.05rem;
      font-weight: 600;
      border-radius: 10px;
      box-shadow: 0 8px 24px rgba(2, 132, 199, 0.35);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-main-glow:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(139, 92, 246, 0.45);
    }
    .btn-secondary-glow {
      padding: 14px 28px;
      background: #ffffff;
      color: var(--text-main);
      text-decoration: none;
      font-size: 1.05rem;
      font-weight: 600;
      border-radius: 10px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }
    .btn-secondary-glow:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(2, 132, 199, 0.03);
    }

    /* 平台指标卡片 (Hero区域下方数字) */
    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
    }
    .stat-card {
      background: var(--bg-card);
      padding: 24px 16px;
      border-radius: 14px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      position: relative;
      overflow: hidden;
      transition: all 0.3s ease;
    }
    .stat-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, #06b6d4, #8b5cf6);
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    .stat-value {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 公共模块框架 */
    .section-block {
      padding: 70px 0;
    }
    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 50px;
    }
    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--primary);
      margin-bottom: 8px;
      display: block;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      letter-spacing: -0.01em;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
    }

    /* 模型矩阵徽章墙 */
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-bottom: 30px;
    }
    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 9999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .model-pill:hover {
      border-color: #8b5cf6;
      color: #8b5cf6;
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(139, 92, 246, 0.15);
    }

    /* 服务能力卡片网格 */
    .grid-cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .feature-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 28px 24px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      position: relative;
    }
    .feature-box:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-shadow-hover);
      border-color: rgba(6, 182, 212, 0.4);
    }
    .feature-icon-title {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }
    .icon-badge {
      width: 40px;
      height: 40px;
      border-radius: 10px;
      background: linear-gradient(135deg, rgba(6, 182, 212, 0.12), rgba(139, 92, 246, 0.12));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
    }
    .feature-box h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .feature-box p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 平台介绍图文板块 */
    .about-layout {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
      background: #ffffff;
      padding: 40px;
      border-radius: 18px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }
    .about-text h3 {
      font-size: 1.6rem;
      font-weight: 800;
      margin-bottom: 16px;
      color: var(--text-main);
    }
    .about-text p {
      color: var(--text-muted);
      font-size: 0.95rem;
      margin-bottom: 20px;
    }
    .about-points {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      margin-bottom: 24px;
    }
    .about-points li {
      font-size: 0.9rem;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 500;
    }
    .about-points li::before {
      content: "✓";
      color: #06b6d4;
      font-weight: 800;
    }
    .media-card {
      border-radius: 12px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
      border: 1px solid var(--border-color);
      background: #f1f5f9;
    }
    .media-card img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    /* 流程步骤 */
    .process-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 24px;
      position: relative;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }
    .step-card:hover {
      border-color: #8b5cf6;
      transform: translateY(-3px);
    }
    .step-num {
      font-size: 1.8rem;
      font-weight: 900;
      background: linear-gradient(135deg, #06b6d4, #8b5cf6);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 8px;
    }
    .step-card h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .step-card p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 对比评测板块 */
    .review-score-panel {
      background: linear-gradient(135deg, #0f172a, #1e293b);
      color: #ffffff;
      padding: 36px;
      border-radius: 18px;
      margin-bottom: 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      box-shadow: 0 10px 30px rgba(15, 23, 42, 0.15);
    }
    .review-score-left h3 {
      font-size: 1.5rem;
      margin-bottom: 6px;
    }
    .review-stars {
      color: #fbbf24;
      font-size: 1.3rem;
      margin-bottom: 6px;
    }
    .review-score-right {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }
    .score-big {
      font-size: 3.5rem;
      font-weight: 900;
      color: #38bdf8;
      line-height: 1;
    }
    .score-max {
      font-size: 1.2rem;
      color: #94a3b8;
    }
    .compare-table-wrapper {
      overflow-x: auto;
      background: #ffffff;
      border-radius: 14px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }
    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }
    .highlight-col {
      background: rgba(6, 182, 212, 0.04);
      font-weight: 600;
      color: var(--primary);
    }

    /* 案例中心双列 */
    .case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }
    .case-card .img-box {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #f1f5f9;
      overflow: hidden;
    }
    .case-card .img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-content {
      padding: 24px;
    }
    .case-content h4 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .case-content p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 24px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-quote {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      position: relative;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 12px;
    }
    .author-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, #06b6d4, #8b5cf6);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }
    .author-info h5 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .author-info span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ 手风琴 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }
    .faq-question {
      padding: 18px 22px;
      font-size: 1rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
      transition: background-color 0.2s ease;
    }
    .faq-question:hover {
      background-color: #f8fafc;
    }
    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.25s ease;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #fafbfc;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.6;
      padding: 0 22px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 14px 22px 18px;
      border-top: 1px solid var(--border-color);
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }

    /* 需求表单与联系方式 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 36px;
      background: #ffffff;
      padding: 40px;
      border-radius: 18px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s ease;
      background: #f8fafc;
      color: var(--text-main);
    }
    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
    }
    .btn-submit {
      width: 100%;
      padding: 14px;
      background: linear-gradient(135deg, #0284c7, #8b5cf6);
      color: #ffffff;
      border: none;
      border-radius: 8px;
      font-size: 1rem;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 6px 18px rgba(2, 132, 199, 0.3);
      transition: all 0.3s ease;
    }
    .btn-submit:hover {
      opacity: 0.95;
      transform: translateY(-2px);
    }
    .contact-info-panel {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 20px;
    }
    .qr-card {
      background: #f8fafc;
      padding: 20px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      text-align: center;
    }
    .qr-card img {
      width: 130px;
      height: 130px;
      object-fit: contain;
      margin: 0 auto 10px;
      display: block;
      border-radius: 8px;
    }
    .contact-meta-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 0.92rem;
    }
    .contact-meta-list li {
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--text-muted);
    }
    .contact-meta-list strong {
      color: var(--text-main);
    }

    /* 文章与外链列表 */
    .article-tags-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 16px;
    }
    .article-tag-link {
      background: #f1f5f9;
      padding: 6px 14px;
      border-radius: 6px;
      text-decoration: none;
      color: var(--text-muted);
      font-size: 0.88rem;
      transition: all 0.2s ease;
    }
    .article-tag-link:hover {
      background: var(--primary);
      color: #ffffff;
    }

    /* 页脚统一深色 */
    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 50px 0 24px;
      margin-top: auto;
      border-top: 1px solid #1e293b;
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-col ul li a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.88rem;
      transition: color 0.2s ease;
    }
    .footer-col ul li a:hover {
      color: #38bdf8;
    }
    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding: 20px 0;
      margin-bottom: 20px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 0.85rem;
    }
    .friend-links-box span {
      color: #cbd5e1;
      font-weight: 600;
    }
    .friend-links-box a {
      color: #94a3b8;
      text-decoration: none;
      transition: color 0.2s ease;
    }
    .friend-links-box a:hover {
      color: #38bdf8;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      text-align: center;
      font-size: 0.82rem;
      color: #64748b;
    }

    /* 浮动客服入口 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: linear-gradient(135deg, #06b6d4, #8b5cf6);
      color: #ffffff;
      padding: 12px 18px;
      border-radius: 9999px;
      box-shadow: 0 8px 24px rgba(6, 182, 212, 0.4);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      font-size: 0.9rem;
      font-weight: 600;
      transition: transform 0.25s ease;
    }
    .floating-kefu:hover {
      transform: scale(1.05);
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .hero-stats { grid-template-columns: repeat(2, 1fr); }
      .grid-cards { grid-template-columns: repeat(2, 1fr); }
      .process-grid { grid-template-columns: repeat(2, 1fr); }
      .reviews-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-top { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .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; }
      .mobile-menu-btn { display: block; }
      .hero-title { font-size: 2rem; }
      .grid-cards, .case-grid, .reviews-grid, .about-layout, .contact-wrapper { grid-template-columns: 1fr; }
      .process-grid { grid-template-columns: 1fr; }
      .footer-top { grid-template-columns: 1fr; }
      .about-layout { padding: 24px; }
      .contact-wrapper { padding: 24px; }
    }