:root {
      --bg-base: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --neon-cyan: #00f2fe;
      --neon-magenta: #ff0844;
      --neon-purple: #7f00ff;
      --primary: #6366f1;
      --primary-hover: #4f46e5;
      --border-color: #e2e8f0;
      --card-shadow: 0 10px 30px rgba(99, 102, 241, 0.08);
      --neon-glow: 0 0 20px rgba(0, 242, 254, 0.35);
      --radius: 12px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    /* 居中容器规范 */
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 2px solid transparent;
      border-image: linear-gradient(90deg, var(--neon-cyan), var(--neon-magenta), var(--neon-purple)) 1;
      box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

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

    .ai-page-logo {
      max-height: 44px;
      width: auto;
      object-fit: contain;
    }

    .nav-links-wrapper {
      display: flex;
      align-items: center;
    }

    .nav-links {
      gap: 0; /* 严格按照要求设置 */
      display: flex;
      align-items: center;
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .nav-links li {
      padding: 0 10px;
    }

    .nav-links a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      transition: color 0.3s;
      white-space: nowrap;
    }

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

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

    .btn-neon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-weight: 600;
      font-size: 14px;
      border-radius: 30px;
      color: #ffffff;
      background: linear-gradient(135deg, #7f00ff, #ff0844);
      box-shadow: 0 4px 15px rgba(255, 8, 68, 0.3);
      transition: transform 0.3s, box-shadow 0.3s;
      border: none;
      cursor: pointer;
    }

    .btn-neon:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 242, 254, 0.5);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 通用Section规范 */
    section {
      padding: 80px 0;
      border-bottom: 1px solid #edf2f7;
    }

    .section-title-wrap {
      text-align: center;
      margin-bottom: 50px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      border-radius: 20px;
      background: rgba(99, 102, 241, 0.1);
      color: var(--primary);
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      margin-bottom: 10px;
      border: 1px solid rgba(0, 242, 254, 0.4);
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 700px;
      margin: 0 auto;
    }

    /* 首屏 HERO 区域（严格无图片） */
    .hero-section {
      padding: 100px 0 80px;
      background: radial-gradient(circle at 50% 20%, rgba(0, 242, 254, 0.12), rgba(255, 8, 68, 0.05), transparent 70%);
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid var(--neon-cyan);
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary);
      box-shadow: var(--neon-glow);
      margin-bottom: 24px;
    }

    /* H1改写 控制在20字以内 */
    .hero-title {
      font-size: 44px;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #0f172a 0%, #4f46e5 50%, #ff0844 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

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

    .hero-btn-main {
      padding: 14px 36px;
      font-size: 16px;
      font-weight: 700;
      border-radius: 30px;
      background: linear-gradient(90deg, #00f2fe, #4f46e5, #ff0844);
      color: #ffffff;
      box-shadow: 0 8px 25px rgba(0, 242, 254, 0.4);
      transition: all 0.3s;
    }

    .hero-btn-main:hover {
      transform: translateY(-3px);
      box-shadow: 0 12px 30px rgba(255, 8, 68, 0.5);
    }

    .hero-btn-sub {
      padding: 14px 30px;
      font-size: 16px;
      font-weight: 600;
      border-radius: 30px;
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      transition: all 0.3s;
    }

    .hero-btn-sub:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
    }

    .metric-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      position: relative;
      overflow: hidden;
    }

    .metric-card::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; height: 3px;
      background: linear-gradient(90deg, var(--neon-cyan), var(--neon-magenta));
    }

    .metric-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 通用卡片网格 */
    .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-radius: var(--radius);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: all 0.3s;
      position: relative;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      border-color: var(--neon-cyan);
      box-shadow: 0 15px 35px rgba(0, 242, 254, 0.2);
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: linear-gradient(135deg, rgba(0,242,254,0.1), rgba(255,8,68,0.1));
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 20px;
      margin-bottom: 18px;
      border: 1px solid rgba(99, 102, 241, 0.2);
    }

    .feature-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .feature-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 对比表格 */
    .table-wrapper {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }

    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .comp-table th, .comp-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f5f9;
      font-size: 14px;
    }

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

    .comp-table tr.highlight {
      background: rgba(0, 242, 254, 0.04);
    }

    .score-badge {
      display: inline-block;
      padding: 4px 10px;
      background: linear-gradient(90deg, #ff0844, #7f00ff);
      color: #ffffff;
      font-weight: 800;
      border-radius: 6px;
      font-size: 13px;
    }

    /* 案例图片墙 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .case-img-holder {
      width: 100%;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .ai-page-image {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s;
    }

    .case-card:hover .ai-page-image {
      transform: scale(1.03);
    }

    .case-info {
      padding: 20px;
    }

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

    .review-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }

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

    .user-avatar-text {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--neon-cyan), var(--primary));
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .user-meta h4 {
      font-size: 15px;
      font-weight: 700;
    }

    .user-meta span {
      font-size: 12px;
      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-radius: var(--radius);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 16px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
    }

    .faq-question::after {
      content: '+';
      font-size: 20px;
      color: var(--primary);
      transition: transform 0.3s;
    }

    .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: 14px;
      line-height: 1.7;
      background: #fafafa;
    }

    .faq-item.active .faq-answer {
      max-height: 250px;
      padding: 16px 24px 20px;
    }

    /* 表单与联系 */
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }

    .contact-form {
      background: #ffffff;
      padding: 32px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 14px;
      outline: none;
      transition: border-color 0.3s;
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    }

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

    .submit-btn {
      width: 100%;
      padding: 14px;
      border-radius: 8px;
      background: linear-gradient(90deg, #7f00ff, #ff0844);
      color: #ffffff;
      font-weight: 700;
      font-size: 16px;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 15px rgba(127, 0, 255, 0.3);
    }

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

    .qr-code-img {
      max-width: 160px;
      height: auto;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      margin-top: 10px;
    }

    /* 友情链接与页脚 */
    footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
    }

    .footer-content {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-brand h3 {
      color: #ffffff;
      font-size: 20px;
      margin-bottom: 12px;
    }

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

    .friend-links a {
      color: #cbd5e1;
      font-size: 13px;
      background: rgba(255,255,255,0.05);
      padding: 4px 10px;
      border-radius: 4px;
      transition: color 0.3s;
    }

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

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #64748b;
    }

    /* 文章列表链接 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 14px 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      transition: border-color 0.3s;
    }

    .article-item:hover {
      border-color: var(--primary);
    }

    .article-item a {
      font-weight: 600;
      color: var(--text-main);
    }

    /* 浮动客服 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: #ffffff;
      border: 2px solid var(--neon-cyan);
      border-radius: 30px;
      padding: 8px 16px;
      box-shadow: 0 8px 25px rgba(0,0,0,0.15);
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 700;
      color: var(--primary);
      cursor: pointer;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .grid-3, .grid-4, .review-grid, .case-grid, .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-layout {
        grid-template-columns: 1fr;
      }
      .footer-content {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links-wrapper {
        display: none;
        position: absolute;
        top: 76px;
        left: 0; right: 0;
        background: #ffffff;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      }
      .nav-links-wrapper.active {
        display: block;
      }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-links li {
        padding: 10px 0;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 28px;
      }
      .grid-3, .grid-4, .review-grid, .case-grid, .hero-metrics {
        grid-template-columns: 1fr;
      }
      .footer-content {
        grid-template-columns: 1fr;
      }
    }