:root {
      --bg-main: #060913;
      --bg-surface: #0b1120;
      --bg-card: #111a2e;
      --bg-card-hover: #16223d;
      --neon-cyan: #00f2fe;
      --neon-pink: #f72585;
      --neon-purple: #7209b7;
      --neon-blue: #4cc9f0;
      --neon-green: #10b981;
      --text-main: #f8fafc;
      --text-muted: #94a3b8;
      --text-dim: #64748b;
      --border-glow: rgba(0, 242, 254, 0.2);
      --border-subtle: rgba(255, 255, 255, 0.08);
      --gradient-neon: linear-gradient(135deg, #00f2fe 0%, #4facfe 50%, #f72585 100%);
      --gradient-accent: linear-gradient(135deg, #00f2fe 0%, #7209b7 100%);
      --shadow-cyan: 0 0 25px rgba(0, 242, 254, 0.25);
      --shadow-pink: 0 0 25px rgba(247, 37, 133, 0.25);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    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: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 15% 10%, rgba(0, 242, 254, 0.08) 0%, transparent 40%),
        radial-gradient(circle at 85% 30%, rgba(247, 37, 133, 0.08) 0%, transparent 45%),
        radial-gradient(circle at 50% 80%, rgba(114, 9, 183, 0.08) 0%, transparent 50%);
      background-attachment: fixed;
    }

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

    /* 容器体系 */
    .container {
      width: 100%;
      max-width: 1240px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    .section-wrap {
      padding: 80px 0;
      position: relative;
    }

    .section-head {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 16px;
      border-radius: 999px;
      font-size: 0.85rem;
      font-weight: 600;
      letter-spacing: 1px;
      color: var(--neon-cyan);
      background: rgba(0, 242, 254, 0.1);
      border: 1px solid rgba(0, 242, 254, 0.3);
      margin-bottom: 12px;
      text-transform: uppercase;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 16px;
      background: linear-gradient(135deg, #ffffff 30%, var(--neon-cyan) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    /* 顶部导航 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(6, 9, 19, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-subtle);
    }

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

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

    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

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

    .nav-links li a {
      font-size: 0.95rem;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      display: block;
    }

    .nav-links li a:hover {
      color: var(--neon-cyan);
      background: rgba(0, 242, 254, 0.05);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      white-space: nowrap;
    }

    .btn-neon {
      background: var(--gradient-neon);
      color: #060913;
      box-shadow: var(--shadow-cyan);
    }

    .btn-neon:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 35px rgba(0, 242, 254, 0.5);
    }

    .btn-outline {
      border-color: var(--neon-cyan);
      color: var(--neon-cyan);
      background: rgba(0, 242, 254, 0.05);
    }

    .btn-outline:hover {
      background: rgba(0, 242, 254, 0.15);
      transform: translateY(-2px);
    }

    .nav-toggle {
      display: none;
      background: transparent;
      border: none;
      color: var(--text-main);
      font-size: 1.5rem;
      cursor: pointer;
    }

    /* Hero 首屏 (无图) */
    .hero-section {
      padding: 90px 0 80px;
      position: relative;
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: rgba(0, 242, 254, 0.08);
      border: 1px solid rgba(0, 242, 254, 0.3);
      border-radius: 999px;
      color: var(--neon-cyan);
      font-size: 0.9rem;
      margin-bottom: 24px;
      animation: pulseGlow 3s infinite alternate;
    }

    @keyframes pulseGlow {
      0% { box-shadow: 0 0 10px rgba(0, 242, 254, 0.2); }
      100% { box-shadow: 0 0 25px rgba(0, 242, 254, 0.5); }
    }

    .hero-title {
      font-size: 2.8rem;
      line-height: 1.25;
      font-weight: 800;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-title .glow-cyan {
      color: var(--neon-cyan);
      text-shadow: 0 0 20px rgba(0, 242, 254, 0.5);
    }

    .hero-title .glow-pink {
      color: var(--neon-pink);
      text-shadow: 0 0 20px rgba(247, 37, 133, 0.5);
    }

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

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

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1080px;
      margin: 0 auto;
    }

    .stat-card {
      background: var(--bg-card);
      border: 1px solid var(--border-glow);
      padding: 24px;
      border-radius: var(--radius-md);
      position: relative;
      overflow: hidden;
      transition: var(--transition);
    }

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

    .stat-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: var(--gradient-neon);
    }

    .stat-val {
      font-size: 2rem;
      font-weight: 800;
      color: var(--neon-cyan);
      margin-bottom: 6px;
    }

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

    /* 服务能力卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .card-neon {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .card-neon:hover {
      border-color: var(--neon-cyan);
      transform: translateY(-4px);
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), 0 0 20px rgba(0, 242, 254, 0.15);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: rgba(0, 242, 254, 0.1);
      border: 1px solid rgba(0, 242, 254, 0.3);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--neon-cyan);
      font-size: 1.3rem;
      margin-bottom: 20px;
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .card-desc {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
      margin-bottom: 18px;
      flex-grow: 1;
    }

    .card-badge {
      display: inline-block;
      align-self: flex-start;
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.78rem;
      background: rgba(247, 37, 133, 0.15);
      color: #ff5c9f;
      border: 1px solid rgba(247, 37, 133, 0.3);
    }

    /* 场景矩阵 4列 */
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
    }

    .matrix-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-sm);
      padding: 20px;
      transition: var(--transition);
    }

    .matrix-item:hover {
      border-color: var(--neon-cyan);
      background: var(--bg-card);
      transform: translateY(-3px);
    }

    .matrix-title {
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .matrix-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 模型标签云 */
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      padding: 8px 16px;
      background: var(--bg-surface);
      border: 1px solid rgba(0, 242, 254, 0.2);
      border-radius: 999px;
      font-size: 0.88rem;
      color: var(--text-main);
      transition: var(--transition);
    }

    .model-tag:hover {
      border-color: var(--neon-cyan);
      background: rgba(0, 242, 254, 0.1);
      color: var(--neon-cyan);
      transform: scale(1.05);
    }

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

    .step-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      position: relative;
    }

    .step-num {
      position: absolute;
      top: -14px;
      left: 20px;
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--gradient-neon);
      color: #060913;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
    }

    .step-card h3 {
      font-size: 1.15rem;
      margin-top: 8px;
      margin-bottom: 10px;
    }

    .step-card p {
      color: var(--text-muted);
      font-size: 0.9rem;
      line-height: 1.5;
    }

    /* 对比评测板块 */
    .eval-box {
      background: var(--bg-card);
      border: 1px solid var(--neon-cyan);
      box-shadow: 0 0 30px rgba(0, 242, 254, 0.1);
      border-radius: var(--radius-lg);
      padding: 40px;
    }

    .eval-head {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 20px;
    }

    .eval-score {
      display: flex;
      align-items: center;
      gap: 16px;
      background: rgba(0, 242, 254, 0.06);
      border: 1px solid rgba(0, 242, 254, 0.3);
      padding: 12px 24px;
      border-radius: var(--radius-md);
    }

    .score-num {
      font-size: 2.4rem;
      font-weight: 900;
      color: var(--neon-cyan);
    }

    .score-stars {
      color: #ffd166;
      font-size: 1.3rem;
      letter-spacing: 2px;
    }

    .table-wrap {
      overflow-x: auto;
    }

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

    .neon-table th, .neon-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-subtle);
    }

    .neon-table th {
      background: rgba(255, 255, 255, 0.02);
      color: var(--text-muted);
      font-weight: 600;
    }

    .neon-table td strong {
      color: var(--neon-cyan);
    }

    /* 案例中心图文展示 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .case-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
    }

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

    .case-media {
      aspect-ratio: 16 / 9;
      background: var(--bg-surface);
      position: relative;
      overflow: hidden;
    }

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

    .case-card:hover .case-media img {
      transform: scale(1.03);
    }

    .case-content {
      padding: 24px;
    }

    .case-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
    }

    .case-desc {
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.6;
    }

    /* 评论板块 */
    .comment-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .comment-card:hover {
      border-color: var(--neon-pink);
    }

    .comment-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--gradient-accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #fff;
    }

    .user-info h4 {
      font-size: 1rem;
      font-weight: 600;
    }

    .user-info span {
      font-size: 0.8rem;
      color: var(--text-dim);
    }

    .comment-text {
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 常见问题 FAQ */
    .faq-list {
      max-width: 920px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

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

    .faq-item.active {
      border-color: var(--neon-cyan);
    }

    .faq-quest {
      padding: 20px 24px;
      font-size: 1.05rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-quest span {
      color: var(--text-main);
    }

    .faq-icon {
      font-size: 1.2rem;
      color: var(--neon-cyan);
      transition: var(--transition);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--neon-pink);
    }

    .faq-answ {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
      padding: 0 24px;
    }

    .faq-item.active .faq-answ {
      padding-bottom: 20px;
    }

    /* 文章列表 */
    .article-wrap {
      background: var(--bg-surface);
      border-radius: var(--radius-md);
      padding: 30px;
      border: 1px solid var(--border-subtle);
    }

    .article-links {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 16px;
      margin-top: 20px;
    }

    .article-link-item {
      background: var(--bg-card);
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-subtle);
      display: flex;
      align-items: center;
      justify-content: space-between;
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    .article-link-item:hover {
      border-color: var(--neon-cyan);
      color: var(--neon-cyan);
    }

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

    .contact-info-panel {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      padding: 32px;
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 16px;
      margin-bottom: 24px;
    }

    .contact-icon-box {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: rgba(0, 242, 254, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--neon-cyan);
      font-size: 1.2rem;
    }

    .qr-box {
      margin-top: 24px;
      padding: 16px;
      background: var(--bg-surface);
      border-radius: var(--radius-sm);
      display: inline-block;
      text-align: center;
    }

    .qr-box img {
      max-width: 140px;
      height: auto;
      border-radius: 6px;
      display: block;
      margin: 0 auto 8px;
    }

    .form-panel {
      background: var(--bg-card);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-md);
      padding: 36px;
    }

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

    .form-group label {
      display: block;
      margin-bottom: 8px;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      background: var(--bg-surface);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-sm);
      color: var(--text-main);
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 10px rgba(0, 242, 254, 0.2);
    }

    /* 底部友情链接与版权 */
    .footer-main {
      background: #04060c;
      border-top: 1px solid var(--border-subtle);
      padding: 60px 0 30px;
    }

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

    .friend-links-box {
      margin-top: 30px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
    }

    .friend-links-title {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-bottom: 12px;
    }

    .friend-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friend-links-wrap a {
      color: var(--text-dim);
      font-size: 0.88rem;
    }

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

    .footer-bottom {
      text-align: center;
      padding-top: 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      color: var(--text-dim);
      font-size: 0.88rem;
    }

    /* 悬浮客服 */
    .float-kefu {
      position: fixed;
      right: 24px;
      bottom: 40px;
      z-index: 999;
      background: var(--gradient-accent);
      width: 54px;
      height: 54px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      box-shadow: var(--shadow-pink);
      cursor: pointer;
      transition: var(--transition);
    }

    .float-kefu:hover {
      transform: scale(1.1);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .cards-grid { grid-template-columns: repeat(2, 1fr); }
      .matrix-grid { grid-template-columns: repeat(2, 1fr); }
      .step-grid { grid-template-columns: repeat(2, 1fr); gap: 30px 20px; }
      .comment-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-top { grid-template-columns: 1fr; gap: 30px; }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--bg-surface);
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-glow);
      }
      .nav-links.show { display: flex; }
      .nav-toggle { display: block; }
      .hero-title { font-size: 2rem; }
      .cards-grid, .matrix-grid, .case-grid, .comment-grid, .contact-grid { grid-template-columns: 1fr; }
      .eval-head { flex-direction: column; align-items: flex-start; }
    }