* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --brand-start: #6c5ce7;
      --brand-end: #00cec9;
      --brand-accent: #fd79a8;
      --ink: #1e272e;
      --ink-soft: #485460;
      --paper: #f8f9fc;
      --card-bg: rgba(255, 255, 255, 0.7);
      --shadow-sm: 0 8px 24px rgba(108, 92, 231, 0.08);
      --shadow-md: 0 16px 40px rgba(108, 92, 231, 0.12);
      --shadow-lg: 0 24px 56px rgba(108, 92, 231, 0.18);
      --radius-lg: 24px;
      --radius-md: 18px;
      --radius-sm: 12px;
      --container-max: 1200px;
      --container-pad: 24px;
    }
    body {
      font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      color: var(--ink);
      line-height: 1.6;
      background-color: #f3f6fd;
      background-image: radial-gradient(circle at 10% 20%, rgba(108, 92, 231, 0.06) 0%, transparent 30%),
                        radial-gradient(circle at 90% 30%, rgba(0, 206, 201, 0.06) 0%, transparent 35%),
                        radial-gradient(circle at 50% 80%, rgba(253, 121, 168, 0.05) 0%, transparent 40%);
      background-attachment: fixed;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    ul {
      list-style: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 var(--container-pad);
    }
    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.78);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(108, 92, 231, 0.08);
      transition: box-shadow 0.25s ease;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
    }
    .brand {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand .ai-page-logo {
      width: 44px;
      height: auto;
      max-width: 100%;
    }
    .brand-text {
      font-weight: 700;
      font-size: 1.25rem;
      background: linear-gradient(135deg, var(--brand-start), var(--brand-end));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      letter-spacing: -0.02em;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      flex-wrap: wrap;
    }
    .nav-links a {
      padding: 8px 14px;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--ink-soft);
      border-radius: 999px;
      transition: color 0.2s, background 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--brand-start);
      background: rgba(108, 92, 231, 0.08);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-outline {
      border: 1.5px solid var(--brand-start);
      color: var(--brand-start);
      background: transparent;
      padding: 8px 20px;
      border-radius: 999px;
      font-size: 0.9rem;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: var(--brand-start);
      color: #fff;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--brand-start), var(--brand-end));
      border: none;
      color: #fff;
      padding: 10px 24px;
      border-radius: 999px;
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      transition: transform 0.2s, box-shadow 0.25s;
      box-shadow: 0 8px 20px rgba(108, 92, 231, 0.25);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 14px 28px rgba(108, 92, 231, 0.35);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--ink);
      cursor: pointer;
      padding: 4px 8px;
    }
    /* 首屏 Hero */
    .hero {
      position: relative;
      padding: 72px 0 56px;
      overflow: hidden;
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      z-index: 0;
      background: radial-gradient(ellipse at 20% 20%, rgba(108, 92, 231, 0.12) 0%, transparent 55%),
                  radial-gradient(ellipse at 80% 50%, rgba(0, 206, 201, 0.10) 0%, transparent 55%);
      pointer-events: none;
    }
    .hero-grid {
      position: absolute;
      inset: 0;
      background-image: linear-gradient(rgba(108, 92, 231, 0.03) 1px, transparent 1px),
                        linear-gradient(90deg, rgba(108, 92, 231, 0.03) 1px, transparent 1px);
      background-size: 48px 48px;
      mask-image: radial-gradient(ellipse at center, black, transparent 75%);
      -webkit-mask-image: radial-gradient(ellipse at center, black, transparent 75%);
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 1;
      max-width: 780px;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(255, 255, 255, 0.7);
      backdrop-filter: blur(8px);
      padding: 6px 18px;
      border-radius: 999px;
      font-size: 0.85rem;
      font-weight: 500;
      color: var(--brand-start);
      border: 1px solid rgba(108, 92, 231, 0.2);
      margin-bottom: 24px;
      animation: fadeUp 0.6s ease both;
    }
    .hero h1 {
      font-size: 3rem;
      line-height: 1.2;
      font-weight: 800;
      letter-spacing: -0.03em;
      color: var(--ink);
      margin-bottom: 20px;
      animation: fadeUp 0.6s 0.1s ease both;
    }
    .hero h1 span {
      background: linear-gradient(135deg, var(--brand-start), var(--brand-end), var(--brand-accent));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--ink-soft);
      max-width: 620px;
      margin-bottom: 32px;
      animation: fadeUp 0.6s 0.2s ease both;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      animation: fadeUp 0.6s 0.3s ease both;
    }
    .hero-metrics {
      display: flex;
      flex-wrap: wrap;
      gap: 24px 48px;
      margin-top: 48px;
      padding-top: 32px;
      border-top: 1px solid rgba(108, 92, 231, 0.12);
      animation: fadeUp 0.6s 0.4s ease both;
    }
    .metric-item .num {
      font-size: 1.8rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--brand-start), var(--brand-end));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }
    .metric-item .label {
      font-size: 0.85rem;
      color: var(--ink-soft);
    }
    /* 区块通用 */
    .section {
      padding: 64px 0;
    }
    .section-head {
      margin-bottom: 40px;
      max-width: 680px;
    }
    .section-tag {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--brand-start);
      background: rgba(108, 92, 231, 0.08);
      padding: 4px 14px;
      border-radius: 999px;
      margin-bottom: 12px;
    }
    .section-head h2 {
      font-size: 2rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-bottom: 12px;
      color: var(--ink);
    }
    .section-head p {
      color: var(--ink-soft);
      font-size: 1.05rem;
    }
    /* 卡片网格 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 24px;
    }
    .card {
      background: var(--card-bg);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border: 1px solid rgba(255, 255, 255, 0.7);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(108, 92, 231, 0.15), rgba(0, 206, 201, 0.12));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 16px;
    }
    .card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--ink);
    }
    .card p {
      font-size: 0.92rem;
      color: var(--ink-soft);
      line-height: 1.65;
    }
    /* 流程步骤 */
    .steps {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
      gap: 20px;
      counter-reset: step;
    }
    .step-item {
      background: rgba(255, 255, 255, 0.6);
      backdrop-filter: blur(6px);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      border: 1px solid rgba(108, 92, 231, 0.1);
      position: relative;
      transition: background 0.2s;
    }
    .step-item::before {
      counter-increment: step;
      content: counter(step);
      display: flex;
      align-items: center;
      justify-content: center;
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--brand-start), var(--brand-end));
      color: #fff;
      font-weight: 700;
      font-size: 0.9rem;
      margin-bottom: 12px;
    }
    .step-item h4 {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 4px;
    }
    .step-item p {
      font-size: 0.85rem;
      color: var(--ink-soft);
    }
    /* 对比表格 */
    .table-wrap {
      overflow-x: auto;
      border-radius: var(--radius-md);
      background: rgba(255, 255, 255, 0.6);
      backdrop-filter: blur(6px);
      border: 1px solid rgba(108, 92, 231, 0.1);
    }
    table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.92rem;
      min-width: 620px;
    }
    th, td {
      padding: 14px 18px;
      text-align: left;
      border-bottom: 1px solid rgba(108, 92, 231, 0.08);
    }
    th {
      background: rgba(108, 92, 231, 0.04);
      font-weight: 700;
      color: var(--ink);
      white-space: nowrap;
    }
    td {
      color: var(--ink-soft);
    }
    .rating-stars {
      color: #fdcb6e;
      font-size: 1rem;
      letter-spacing: 2px;
    }
    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 860px;
    }
    .faq-item {
      background: rgba(255, 255, 255, 0.65);
      backdrop-filter: blur(6px);
      border: 1px solid rgba(108, 92, 231, 0.1);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: box-shadow 0.2s;
    }
    .faq-item:hover {
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 18px 22px;
      font-weight: 600;
      cursor: pointer;
      user-select: none;
      font-size: 0.98rem;
      color: var(--ink);
      gap: 12px;
    }
    .faq-question::after {
      content: '+';
      font-size: 1.4rem;
      font-weight: 300;
      color: var(--brand-start);
      transition: transform 0.25s;
      flex-shrink: 0;
    }
    .faq-item.active .faq-question::after {
      content: '−';
      transform: rotate(180deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 22px;
      color: var(--ink-soft);
      font-size: 0.92rem;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 22px 20px;
    }
    /* 评论 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 24px;
    }
    .testimonial-card {
      background: rgba(255, 255, 255, 0.7);
      backdrop-filter: blur(6px);
      border-radius: var(--radius-lg);
      padding: 24px;
      border: 1px solid rgba(255, 255, 255, 0.8);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s, box-shadow 0.25s;
    }
    .testimonial-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }
    .testimonial-card .quote {
      font-size: 0.92rem;
      color: var(--ink-soft);
      line-height: 1.7;
      margin-bottom: 16px;
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--brand-start), var(--brand-end));
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 700;
      font-size: 0.9rem;
    }
    .user-info .name {
      font-weight: 600;
      font-size: 0.9rem;
    }
    .user-info .role {
      font-size: 0.78rem;
      color: var(--ink-soft);
    }
    /* 案例 / 素材 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 24px;
    }
    .case-item {
      background: rgba(255, 255, 255, 0.6);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid rgba(108, 92, 231, 0.1);
      transition: transform 0.25s, box-shadow 0.25s;
    }
    .case-item:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }
    .case-img-wrap {
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #eee;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }
    .case-item:hover .case-img-wrap img {
      transform: scale(1.03);
    }
    .case-body {
      padding: 16px 20px;
    }
    .case-body h4 {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 4px;
    }
    .case-body p {
      font-size: 0.85rem;
      color: var(--ink-soft);
    }
    /* 标签云 & 模型 */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 12px;
    }
    .tag {
      padding: 6px 16px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.7);
      border: 1px solid rgba(108, 92, 231, 0.15);
      font-size: 0.82rem;
      color: var(--ink-soft);
      transition: all 0.2s;
      cursor: default;
    }
    .tag:hover {
      background: linear-gradient(135deg, var(--brand-start), var(--brand-end));
      color: #fff;
      border-color: transparent;
      transform: translateY(-1px);
    }
    /* 价格/服务网络卡片 */
    .price-ref {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }
    .price-card {
      flex: 1 1 200px;
      background: rgba(255, 255, 255, 0.65);
      border-radius: var(--radius-md);
      padding: 20px;
      border: 1px solid rgba(108, 92, 231, 0.1);
    }
    .price-card .model {
      font-size: 0.85rem;
      color: var(--ink-soft);
    }
    .price-card .cost {
      font-size: 1.4rem;
      font-weight: 800;
      background: linear-gradient(135deg, var(--brand-start), var(--brand-end));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      margin: 4px 0;
    }
    .price-card .unit {
      font-size: 0.78rem;
      color: #999;
    }
    /* 表单 */
    .form-section {
      background: rgba(255, 255, 255, 0.55);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-lg);
      padding: 40px;
      border: 1px solid rgba(255, 255, 255, 0.8);
      box-shadow: var(--shadow-sm);
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group.full {
      grid-column: 1 / -1;
    }
    .form-group label {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--ink);
    }
    .form-group input,
    .form-group select,
    .form-group textarea {
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(108, 92, 231, 0.15);
      background: rgba(255, 255, 255, 0.85);
      font-size: 0.92rem;
      font-family: inherit;
      color: var(--ink);
      transition: border-color 0.2s, box-shadow 0.2s;
      outline: none;
    }
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      border-color: var(--brand-start);
      box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.12);
    }
    .form-group textarea {
      resize: vertical;
      min-height: 100px;
    }
    /* 页脚 */
    .site-footer {
      background: #1e272e;
      color: #d5d8dc;
      padding: 48px 0 24px;
      margin-top: 40px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
      margin-bottom: 32px;
    }
    .footer-brand .footer-logo {
      width: 120px;
      margin-bottom: 12px;
    }
    .footer-brand p {
      font-size: 0.85rem;
      line-height: 1.7;
      color: #aab7b8;
      max-width: 300px;
    }
    .footer-col h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 14px;
    }
    .footer-col a {
      display: block;
      font-size: 0.85rem;
      color: #aab7b8;
      margin-bottom: 10px;
      transition: color 0.2s;
    }
    .footer-col a:hover {
      color: var(--brand-end);
    }
    .footer-links-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px 16px;
      margin-bottom: 24px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    .footer-links-cloud a {
      font-size: 0.8rem;
      color: #8395a7;
      transition: color 0.2s;
    }
    .footer-links-cloud a:hover {
      color: var(--brand-end);
    }
    .footer-bottom {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      padding-top: 20px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.8rem;
      color: #8395a7;
      gap: 8px;
    }
    .footer-qrcode img {
      width: 100px;
      border-radius: 8px;
      margin-bottom: 6px;
    }
    /* 浮动客服 */
    .float-kefu {
      position: fixed;
      right: 24px;
      bottom: 100px;
      z-index: 90;
      display: flex;
      flex-direction: column;
      gap: 12px;
      align-items: center;
    }
    .float-kefu button {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      border: none;
      background: linear-gradient(135deg, var(--brand-start), var(--brand-end));
      color: #fff;
      font-size: 1.2rem;
      cursor: pointer;
      box-shadow: var(--shadow-md);
      transition: transform 0.2s, box-shadow 0.2s;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .float-kefu button:hover {
      transform: scale(1.08);
      box-shadow: var(--shadow-lg);
    }
    .kefu-pop {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #fff;
      padding: 14px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-lg);
      display: none;
      text-align: center;
      width: 160px;
      border: 1px solid rgba(108, 92, 231, 0.1);
    }
    .kefu-pop.show {
      display: block;
      animation: fadeUp 0.25s ease;
    }
    .kefu-pop p {
      font-size: 0.8rem;
      color: var(--ink-soft);
      margin-top: 6px;
    }
    .back-top {
      position: fixed;
      right: 24px;
      bottom: 32px;
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #fff;
      border: 1px solid rgba(108, 92, 231, 0.2);
      color: var(--brand-start);
      font-size: 1.1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      z-index: 90;
      box-shadow: var(--shadow-sm);
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.25s, transform 0.25s;
    }
    .back-top.show {
      opacity: 1;
      pointer-events: auto;
    }
    .back-top:hover {
      transform: translateY(-2px);
    }
    /* 动画 */
    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(16px); }
      to { opacity: 1; transform: translateY(0); }
    }
    .reveal {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.97);
        backdrop-filter: blur(16px);
        flex-direction: column;
        align-items: stretch;
        padding: 12px 24px 20px;
        gap: 4px;
        border-bottom: 1px solid rgba(108, 92, 231, 0.1);
        box-shadow: var(--shadow-md);
      }
      .nav-links.open {
        display: flex;
      }
      .nav-links a {
        padding: 12px 8px;
        border-radius: 8px;
      }
      .menu-toggle {
        display: block;
      }
      .header-inner {
        position: relative;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2rem;
      }
      .hero-desc {
        font-size: 1rem;
      }
      .hero-metrics {
        gap: 16px 32px;
      }
      .section {
        padding: 48px 0;
      }
      .section-head h2 {
        font-size: 1.6rem;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-section {
        padding: 24px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-actions .btn-outline {
        display: none;
      }
    }
    @media (max-width: 480px) {
      .hero h1 {
        font-size: 1.6rem;
      }
      .hero-actions {
        flex-direction: column;
        align-items: flex-start;
      }
      .hero-actions .btn-primary,
      .hero-actions .btn-outline {
        width: 100%;
        justify-content: center;
        text-align: center;
      }
    }