:root {
      --bg-main: #0a0b12;
      --bg-card: #121324;
      --bg-card-hover: #1b1c35;
      --accent-pink: #ff2a8d;
      --accent-purple: #9d4edd;
      --accent-cyan: #00f2fe;
      --text-main: #ffffff;
      --text-muted: #cbd5e1;
      --text-dim: #94a3b8;
      --border-color: rgba(255, 42, 141, 0.25);
      --border-hover: rgba(0, 242, 254, 0.5);
      --glow-pink: 0 0 25px rgba(255, 42, 141, 0.4);
      --glow-purple: 0 0 25px rgba(157, 78, 221, 0.4);
      --site-width: 1200px;
      --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-main);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background: radial-gradient(circle at 10% 20%, rgba(157, 78, 221, 0.15), transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(255, 42, 141, 0.15), transparent 40%),
                  radial-gradient(circle at 50% 50%, rgba(0, 242, 254, 0.05), transparent 60%),
                  var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      min-height: 100vh;
    }

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

    /* 统一居中容器 */
    .site-container {
      width: 100%;
      max-width: var(--site-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(10, 11, 18, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255, 42, 141, 0.2);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }

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

    .brand-wrap .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

    .brand-text {
      font-size: 1.25rem;
      font-weight: 800;
      letter-spacing: 1px;
      background: linear-gradient(90deg, #ffffff, var(--accent-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 关键约束：.nav-links 的 gap 属性设置为 0 */
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links li a {
      display: inline-block;
      padding: 10px 14px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: 6px;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--accent-cyan);
      background: rgba(0, 242, 254, 0.08);
      text-shadow: 0 0 8px rgba(0, 242, 254, 0.6);
    }

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

    .btn-login {
      padding: 8px 18px;
      font-size: 0.88rem;
      color: var(--text-main);
      border: 1px solid var(--accent-pink);
      border-radius: 999px;
      background: rgba(255, 42, 141, 0.1);
    }

    .btn-login:hover {
      background: var(--accent-pink);
      box-shadow: var(--glow-pink);
      color: #ffffff;
    }

    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: 1px solid var(--border-color);
      color: var(--text-main);
      padding: 8px 12px;
      border-radius: 6px;
      cursor: pointer;
    }

    /* Hero 首屏 - 禁止包含任何图片 */
    .hero-section {
      padding: 80px 0 60px;
      position: relative;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      border-radius: 999px;
      font-size: 0.85rem;
      background: linear-gradient(90deg, rgba(255, 42, 141, 0.15), rgba(157, 78, 221, 0.2));
      border: 1px solid rgba(255, 42, 141, 0.4);
      color: var(--accent-cyan);
      margin-bottom: 24px;
      box-shadow: var(--glow-purple);
    }

    .hero-title {
      font-size: 2.85rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: 0.5px;
      background: linear-gradient(135deg, #ffffff 30%, #ff7ac6 70%, var(--accent-cyan) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.8;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      flex-wrap: wrap;
      gap: 18px;
      margin-bottom: 48px;
    }

    /* 必须醒目出现访问官网按钮，链接到https://doaigc.com */
    .btn-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 15px 38px;
      font-size: 1.1rem;
      font-weight: 700;
      color: #ffffff;
      border-radius: 999px;
      background: linear-gradient(135deg, var(--accent-pink), var(--accent-purple));
      box-shadow: 0 0 25px rgba(255, 42, 141, 0.55), 0 0 10px rgba(157, 78, 221, 0.5);
      border: 1px solid rgba(255, 255, 255, 0.3);
      transform: translateY(0);
      transition: var(--transition);
    }

    .btn-portal:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 0 35px rgba(255, 42, 141, 0.8), 0 0 20px rgba(0, 242, 254, 0.7);
    }

    .btn-sub-action {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 15px 32px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(0, 242, 254, 0.4);
      backdrop-filter: blur(8px);
    }

    .btn-sub-action:hover {
      background: rgba(0, 242, 254, 0.15);
      border-color: var(--accent-cyan);
      box-shadow: 0 0 20px rgba(0, 242, 254, 0.3);
      color: var(--accent-cyan);
    }

    /* 首屏纯CSS科技数据面板（无图片） */
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1060px;
      margin: 0 auto;
    }

    .stat-card {
      background: rgba(18, 19, 36, 0.7);
      border: 1px solid var(--border-color);
      padding: 24px 16px;
      border-radius: 16px;
      position: relative;
      overflow: hidden;
      backdrop-filter: blur(10px);
      transition: var(--transition);
    }

    .stat-card:hover {
      transform: translateY(-4px);
      border-color: var(--accent-cyan);
      box-shadow: 0 10px 25px rgba(0, 242, 254, 0.15);
    }

    .stat-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--accent-pink), var(--accent-cyan), transparent);
    }

    .stat-num {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--accent-cyan);
      margin-bottom: 6px;
      font-feature-settings: "tnum";
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 通用Section布局 */
    .section-wrap {
      padding: 90px 0 30px;
    }

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

    .section-eyebrow {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 2px;
      color: var(--accent-pink);
      margin-bottom: 10px;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .section-subtitle {
      font-size: 1.02rem;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
    }

    /* 卡片通用网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .cyber-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 28px;
      position: relative;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .cyber-card:hover {
      border-color: var(--border-hover);
      background: var(--bg-card-hover);
      transform: translateY(-5px);
      box-shadow: 0 12px 30px rgba(157, 78, 221, 0.2);
    }

    .card-icon {
      width: 50px;
      height: 50px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(255, 42, 141, 0.2), rgba(0, 242, 254, 0.2));
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--accent-cyan);
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: #ffffff;
    }

    .card-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .card-tag {
      display: inline-block;
      align-self: flex-start;
      font-size: 0.78rem;
      padding: 4px 10px;
      border-radius: 6px;
      background: rgba(255, 42, 141, 0.15);
      border: 1px solid rgba(255, 42, 141, 0.3);
      color: #ff9ecb;
    }

    /* 平台支持模型跑马灯标签云 */
    .models-stream-wrap {
      background: rgba(18, 19, 36, 0.8);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 22px 0;
      overflow: hidden;
      margin: 40px 0;
    }

    .models-marquee {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .model-chip {
      padding: 6px 14px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 8px;
      font-size: 0.86rem;
      font-weight: 600;
      color: #e2e8f0;
      transition: var(--transition);
    }

    .model-chip:hover {
      border-color: var(--accent-cyan);
      color: var(--accent-cyan);
      background: rgba(0, 242, 254, 0.1);
      box-shadow: 0 0 12px rgba(0, 242, 254, 0.3);
    }

    /* 对比评测板块 */
    .review-summary {
      background: linear-gradient(135deg, rgba(255, 42, 141, 0.15), rgba(157, 78, 221, 0.2));
      border: 1px solid rgba(255, 42, 141, 0.4);
      border-radius: 20px;
      padding: 36px;
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }

    .score-box {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }

    .score-val {
      font-size: 4rem;
      font-weight: 900;
      line-height: 1;
      color: var(--accent-cyan);
      text-shadow: 0 0 25px rgba(0, 242, 254, 0.5);
    }

    .score-meta {
      font-size: 1.1rem;
      color: var(--text-muted);
    }

    .stars-render {
      color: #ffd700;
      font-size: 1.5rem;
      letter-spacing: 4px;
      margin-top: 4px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      background: var(--bg-card);
    }

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

    .cyber-table th, .cyber-table td {
      padding: 18px 22px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .cyber-table th {
      background: rgba(255, 42, 141, 0.12);
      color: var(--accent-cyan);
      font-weight: 700;
    }

    .cyber-table tr:hover td {
      background: rgba(255, 255, 255, 0.02);
    }

    .highlight-col {
      color: #ff7ac6;
      font-weight: 700;
      background: rgba(255, 42, 141, 0.05);
    }

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

    .step-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 24px;
      position: relative;
    }

    .step-num {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--accent-pink), var(--accent-purple));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      margin-bottom: 16px;
    }

    /* 宣传图展示区与素材图 */
    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .media-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .media-card-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #0f111c;
      overflow: hidden;
    }

    .media-card-img-wrap.square-wrap {
      aspect-ratio: 1 / 1;
    }

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

    .media-card:hover .media-card-img-wrap img {
      transform: scale(1.04);
    }

    .media-card-info {
      padding: 18px 20px;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      max-width: 960px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-header {
      padding: 20px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 600;
      color: #ffffff;
      user-select: none;
    }

    .faq-header:hover {
      color: var(--accent-cyan);
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      transition: transform 0.3s;
      color: var(--accent-pink);
    }

    .faq-body {
      padding: 0 24px 20px;
      color: var(--text-muted);
      line-height: 1.7;
      display: none;
    }

    .faq-item.active {
      border-color: var(--accent-cyan);
      box-shadow: 0 4px 20px rgba(0, 242, 254, 0.1);
    }

    .faq-item.active .faq-body {
      display: block;
    }

    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
      color: var(--accent-cyan);
    }

    /* 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(--border-color);
      border-radius: 16px;
      padding: 26px;
      display: flex;
      flex-direction: column;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
    }

    .author-avatar-badge {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .author-meta h4 {
      font-size: 1rem;
      color: #ffffff;
    }

    .author-meta p {
      font-size: 0.84rem;
      color: var(--accent-cyan);
    }

    .review-text {
      color: var(--text-muted);
      font-size: 0.94rem;
      line-height: 1.7;
      flex-grow: 1;
    }

    /* 表单与需求匹配区 */
    .contact-container {
      background: linear-gradient(180deg, var(--bg-card), #0e101f);
      border: 1px solid var(--border-color);
      border-radius: 20px;
      padding: 44px;
    }

    .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-width {
      grid-column: span 2;
    }

    .form-label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-muted);
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      background: rgba(10, 11, 18, 0.8);
      border: 1px solid rgba(255, 42, 141, 0.3);
      border-radius: 10px;
      padding: 14px 16px;
      color: #ffffff;
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition);
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--accent-cyan);
      box-shadow: 0 0 15px rgba(0, 242, 254, 0.25);
    }

    .form-submit-btn {
      width: 100%;
      padding: 16px;
      font-size: 1.1rem;
      font-weight: 700;
      color: #ffffff;
      background: linear-gradient(90deg, var(--accent-pink), var(--accent-purple));
      border: none;
      border-radius: 10px;
      cursor: pointer;
      box-shadow: var(--glow-pink);
      transition: var(--transition);
    }

    .form-submit-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 30px rgba(255, 42, 141, 0.7);
    }

    /* 文章列表与资讯 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 24px;
    }

    .article-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 20px;
      transition: var(--transition);
    }

    .article-item:hover {
      border-color: var(--accent-cyan);
      transform: translateY(-4px);
    }

    .article-title {
      font-size: 1rem;
      font-weight: 600;
      color: #ffffff;
      margin-bottom: 8px;
    }

    .article-meta {
      font-size: 0.82rem;
      color: var(--accent-cyan);
    }

    /* 底部统一容器规范 */
    .site-footer {
      background: #07080d;
      border-top: 1px solid rgba(255, 42, 141, 0.25);
      padding: 60px 0 30px;
      color: var(--text-dim);
      font-size: 0.9rem;
    }

    .footer-columns {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-col h3 {
      font-size: 1.1rem;
      color: #ffffff;
      margin-bottom: 18px;
      font-weight: 700;
    }

    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

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

    .qr-card {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      background: var(--bg-card);
      padding: 12px;
      border-radius: 10px;
      border: 1px solid var(--border-color);
    }

    .qr-card img {
      width: 108px;
      height: 108px;
      object-fit: cover;
      border-radius: 6px;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      text-align: center;
      display: flex;
      flex-direction: column;
      gap: 12px;
      color: var(--text-dim);
      font-size: 0.85rem;
    }

    .friend-links-list {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 8px;
    }

    .friend-links-list a {
      color: var(--text-muted);
    }

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

    /* 浮动客服挂件 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 1000;
      display: flex;
      flex-direction: column;
      align-items: flex-end;
      gap: 10px;
    }

    .kefu-trigger {
      width: 54px;
      height: 54px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--accent-pink), var(--accent-purple));
      box-shadow: 0 0 20px rgba(255, 42, 141, 0.6);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: #ffffff;
      border: 1px solid rgba(255, 255, 255, 0.3);
      transition: var(--transition);
    }

    .kefu-trigger:hover {
      transform: scale(1.08);
    }

    .kefu-popover {
      display: none;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 16px;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7);
      text-align: center;
      width: 180px;
    }

    .floating-kefu:hover .kefu-popover {
      display: block;
    }

    .kefu-popover img {
      width: 140px;
      height: 140px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 8px;
    }

    /* 响应式断点控制 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .grid-4, .hero-stats-grid, .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .reviews-grid, .articles-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-columns {
        grid-template-columns: 1fr 1fr;
      }
      .banner-gallery {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 74px;
        left: 0;
        right: 0;
        background: rgba(10, 11, 18, 0.98);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 16px 20px;
        gap: 0;
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li a {
        width: 100%;
        padding: 12px 16px;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-3, .grid-4, .reviews-grid, .articles-grid, .hero-stats-grid, .process-timeline, .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full-width {
        grid-column: span 1;
      }
      .footer-columns {
        grid-template-columns: 1fr;
      }
      .btn-portal, .btn-sub-action {
        width: 100%;
      }
    }