:root {
      --bg-main: #060913;
      --bg-card: rgba(16, 23, 42, 0.75);
      --bg-card-hover: rgba(22, 33, 62, 0.9);
      --neon-cyan: #00f2fe;
      --neon-purple: #9d4edd;
      --neon-magenta: #ff007f;
      --neon-blue: #4facfe;
      --text-main: #f8fafc;
      --text-muted: #94a3b8;
      --text-dim: #64748b;
      --border-color: rgba(255, 255, 255, 0.12);
      --border-glow: rgba(0, 242, 254, 0.4);
      --gradient-accent: linear-gradient(135deg, #00f2fe 0%, #4facfe 50%, #9d4edd 100%);
      --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 {
      overflow-x: hidden;
      background: radial-gradient(circle at 10% 20%, rgba(157, 78, 221, 0.15), transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(0, 242, 254, 0.12), transparent 45%),
                  radial-gradient(circle at 50% 50%, rgba(255, 0, 127, 0.08), transparent 50%),
                  var(--bg-main);
      background-attachment: fixed;
      min-height: 100vh;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.3s ease;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(6, 9, 19, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-wrap img.ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      background: linear-gradient(90deg, #fff, var(--neon-cyan));
      -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 {
      font-size: 0.95rem;
      color: var(--text-muted);
      font-weight: 500;
      padding: 8px 14px;
      border-radius: 6px;
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--neon-cyan);
      text-shadow: 0 0 10px rgba(0, 242, 254, 0.5);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-neon-outline {
      padding: 8px 18px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--neon-cyan);
      border: 1px solid var(--neon-cyan);
      border-radius: 999px;
      background: rgba(0, 242, 254, 0.05);
      box-shadow: 0 0 12px rgba(0, 242, 254, 0.2);
    }
    .btn-neon-outline:hover {
      background: var(--neon-cyan);
      color: #060913;
      box-shadow: 0 0 20px rgba(0, 242, 254, 0.6);
    }
    .mobile-menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: var(--text-main);
      font-size: 1.6rem;
      cursor: pointer;
    }

    /* 模块通用样式 */
    section.section-block {
      padding: 90px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .section-head {
      text-align: center;
      margin-bottom: 56px;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.8rem;
      text-transform: uppercase;
      letter-spacing: 2px;
      color: var(--neon-cyan);
      padding: 4px 14px;
      border-radius: 999px;
      background: rgba(0, 242, 254, 0.08);
      border: 1px solid rgba(0, 242, 254, 0.25);
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 720px;
      margin: 0 auto;
    }

    /* 首屏 Hero */
    .hero-wrap {
      padding: 100px 0 80px;
      text-align: center;
      position: relative;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      border-radius: 999px;
      background: rgba(255, 0, 127, 0.1);
      border: 1px solid rgba(255, 0, 127, 0.3);
      color: #ff6b9d;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: 0 0 15px rgba(255, 0, 127, 0.2);
    }
    .hero-h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 22px;
      background: linear-gradient(135deg, #ffffff 20%, #90e0ef 60%, #b5179e 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -1px;
    }
    .hero-lead {
      font-size: 1.2rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }
    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .btn-main {
      padding: 14px 34px;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 12px;
      background: linear-gradient(90deg, #ff007f, #7928ca);
      color: #fff;
      box-shadow: 0 0 25px rgba(255, 0, 127, 0.4);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 35px rgba(255, 0, 127, 0.7);
    }
    .btn-sub {
      padding: 14px 30px;
      font-size: 1.05rem;
      font-weight: 600;
      border-radius: 12px;
      border: 1px solid var(--border-glow);
      background: rgba(0, 242, 254, 0.05);
      color: var(--neon-cyan);
    }
    .btn-sub:hover {
      background: rgba(0, 242, 254, 0.15);
      transform: translateY(-2px);
    }
    .stats-strip {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }
    .stat-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 24px;
      text-align: center;
      transition: border-color 0.3s;
    }
    .stat-box:hover {
      border-color: var(--neon-cyan);
    }
    .stat-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: #fff;
      margin-bottom: 4px;
      font-family: monospace;
    }
    .stat-num.neon-text {
      color: var(--neon-cyan);
      text-shadow: 0 0 12px rgba(0, 242, 254, 0.4);
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 网格卡片与通用组件 */
    .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: 28px;
    }

    .neon-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 28px;
      position: relative;
      transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
      backdrop-filter: blur(10px);
    }
    .neon-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 242, 254, 0.5);
      box-shadow: 0 10px 30px rgba(0, 242, 254, 0.15);
    }
    .card-icon-tag {
      width: 46px;
      height: 46px;
      border-radius: 10px;
      background: rgba(0, 242, 254, 0.1);
      border: 1px solid rgba(0, 242, 254, 0.2);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--neon-cyan);
      font-size: 1.3rem;
      margin-bottom: 18px;
    }
    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 10px;
    }
    .card-text {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 标签云 */
    .tag-cloud-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }
    .model-tag {
      font-size: 0.85rem;
      padding: 6px 14px;
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: 8px;
      color: #cbd5e1;
      transition: 0.2s;
    }
    .model-tag:hover {
      border-color: var(--neon-purple);
      color: #fff;
      box-shadow: 0 0 10px rgba(157, 78, 221, 0.3);
    }

    /* 评测与评分大卡片 */
    .review-score-banner {
      background: linear-gradient(135deg, rgba(22, 33, 62, 0.8), rgba(15, 23, 42, 0.95));
      border: 1px solid var(--border-glow);
      border-radius: 20px;
      padding: 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 36px;
      box-shadow: 0 0 30px rgba(0, 242, 254, 0.15);
      flex-wrap: wrap;
      gap: 24px;
    }
    .score-big {
      font-size: 4.5rem;
      font-weight: 900;
      line-height: 1;
      color: var(--neon-cyan);
      text-shadow: 0 0 25px rgba(0, 242, 254, 0.6);
      font-family: monospace;
    }
    .stars-box {
      color: #ffb703;
      font-size: 1.4rem;
      margin: 8px 0;
    }
    .score-desc-title {
      font-size: 1.5rem;
      font-weight: 700;
      color: #fff;
    }
    .score-desc-sub {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    /* 对比表格 */
    .table-container {
      overflow-x: auto;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      background: var(--bg-card);
    }
    table.neon-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    table.neon-table th,
    table.neon-table td {
      padding: 16px 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.95rem;
    }
    table.neon-table th {
      background: rgba(255, 255, 255, 0.03);
      color: #fff;
      font-weight: 600;
    }
    table.neon-table tr:hover td {
      background: rgba(0, 242, 254, 0.03);
    }
    .highlight-cell {
      color: var(--neon-cyan);
      font-weight: 700;
    }

    /* 流程步骤 */
    .steps-chain {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-node {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 24px;
      position: relative;
    }
    .step-digit {
      font-size: 1.8rem;
      font-weight: 900;
      font-family: monospace;
      color: var(--neon-magenta);
      margin-bottom: 12px;
    }

    /* 案例展示 */
    .case-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 16px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .case-img-wrap {
      width: 100%;
      overflow: hidden;
      background: #000;
    }
    .case-img-wrap img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.05);
    }
    .case-content {
      padding: 22px;
      flex-grow: 1;
    }

    /* 客户评价卡片 */
    .testimonial-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 26px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-body {
      font-size: 0.95rem;
      color: #cbd5e1;
      line-height: 1.7;
      margin-bottom: 18px;
    }
    .user-meta {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(45deg, var(--neon-cyan), var(--neon-purple));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 700;
      font-size: 1.1rem;
    }
    .user-info h4 {
      font-size: 0.95rem;
      color: #fff;
    }
    .user-info p {
      font-size: 0.8rem;
      color: var(--text-dim);
    }

    /* FAQ 折叠面板 */
    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      overflow: hidden;
      transition: border-color 0.3s;
    }
    .faq-item.active {
      border-color: var(--neon-cyan);
    }
    .faq-header {
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      font-size: 1rem;
      color: #fff;
    }
    .faq-indicator {
      font-size: 1.2rem;
      color: var(--neon-cyan);
      transition: transform 0.3s;
    }
    .faq-item.active .faq-indicator {
      transform: rotate(45deg);
    }
    .faq-body {
      padding: 0 24px 20px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
      display: none;
    }
    .faq-item.active .faq-body {
      display: block;
    }

    /* 表单区 */
    .form-panel {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 20px;
      padding: 40px;
      max-width: 780px;
      margin: 0 auto;
    }
    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 20px;
    }
    .form-group-full {
      grid-column: span 2;
    }
    .form-label {
      display: block;
      font-size: 0.9rem;
      color: #cbd5e1;
      margin-bottom: 8px;
      font-weight: 500;
    }
    .form-control {
      width: 100%;
      background: rgba(15, 23, 42, 0.8);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 8px;
      padding: 12px 16px;
      color: #fff;
      font-size: 0.95rem;
      transition: 0.3s;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--neon-cyan);
      box-shadow: 0 0 10px rgba(0, 242, 254, 0.3);
    }
    textarea.form-control {
      min-height: 120px;
      resize: vertical;
    }
    .btn-submit {
      width: 100%;
      padding: 14px;
      background: linear-gradient(90deg, #00f2fe, #4facfe);
      border: none;
      border-radius: 8px;
      color: #060913;
      font-size: 1.05rem;
      font-weight: 700;
      cursor: pointer;
      transition: all 0.3s ease;
    }
    .btn-submit:hover {
      box-shadow: 0 0 20px rgba(0, 242, 254, 0.5);
      transform: translateY(-2px);
    }

    /* 资讯与友情链接 */
    .article-row {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 24px;
    }
    .article-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 14px 20px;
      background: rgba(255, 255, 255, 0.02);
      border-radius: 8px;
      border: 1px solid rgba(255, 255, 255, 0.06);
    }
    .article-item:hover {
      border-color: var(--neon-cyan);
      background: rgba(0, 242, 254, 0.03);
    }
    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      padding: 18px 0;
    }
    .friend-links-box a {
      font-size: 0.85rem;
      color: var(--text-dim);
      background: rgba(255, 255, 255, 0.03);
      padding: 6px 12px;
      border-radius: 4px;
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .friend-links-box a:hover {
      color: var(--neon-cyan);
      border-color: var(--neon-cyan);
    }

    /* 页脚 */
    footer.site-footer {
      background: #03050a;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-title {
      font-size: 1rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 16px;
    }
    .footer-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-list a {
      color: var(--text-muted);
      font-size: 0.9rem;
    }
    .footer-list a:hover {
      color: var(--neon-cyan);
    }
    .contact-item {
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-muted);
      font-size: 0.9rem;
      margin-bottom: 10px;
    }
    .footer-qr img {
      width: 90px;
      height: 90px;
      border-radius: 8px;
      border: 1px solid rgba(255, 255, 255, 0.15);
      display: block;
    }
    .copyright-bar {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 24px;
      text-align: center;
      color: var(--text-dim);
      font-size: 0.85rem;
    }

    /* 浮动客服挂件 */
    .float-service-panel {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--bg-card);
      border: 1px solid var(--neon-cyan);
      box-shadow: 0 0 15px rgba(0, 242, 254, 0.3);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--neon-cyan);
      cursor: pointer;
      position: relative;
    }
    .float-btn:hover {
      background: var(--neon-cyan);
      color: #060913;
    }
    .float-qr-pop {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #0f172a;
      padding: 12px;
      border-radius: 12px;
      border: 1px solid var(--neon-cyan);
      box-shadow: 0 0 25px rgba(0, 242, 254, 0.4);
      display: none;
      text-align: center;
      width: 140px;
    }
    .float-qr-pop img {
      width: 116px;
      height: 116px;
      display: block;
      margin-bottom: 6px;
    }
    .float-qr-pop span {
      font-size: 0.75rem;
      color: #fff;
    }
    .float-btn.qr-trigger:hover .float-qr-pop {
      display: block;
    }

    /* 响应式调整 */
    @media (max-width: 1024px) {
      .grid-4, .steps-chain {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-strip {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #060913;
        flex-direction: column;
        padding: 20px 0;
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .hero-h1 {
        font-size: 2.1rem;
      }
      .grid-3, .grid-2, .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group-full {
        grid-column: span 1;
      }
      .stats-strip, .steps-chain {
        grid-template-columns: 1fr;
      }
      .review-score-banner {
        flex-direction: column;
        text-align: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }