* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --bg-deep: #0a0a1a;
      --bg-card: rgba(20, 20, 40, 0.75);
      --bg-card-solid: #14142c;
      --border-glow: rgba(200, 80, 255, 0.35);
      --primary: #c44eff;
      --primary-soft: #a53ce0;
      --secondary: #ff4dd0;
      --accent-cyan: #00e5ff;
      --text-main: #f0eaff;
      --text-sub: #c5b8e0;
      --text-dim: #8b7fa8;
      --radius-lg: 20px;
      --radius-md: 14px;
      --radius-sm: 8px;
      --shadow-glow: 0 0 30px rgba(196, 78, 255, 0.35);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    }
    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 20% 10%, #1a0a2e 0%, #0a0a1a 60%, #060610 100%);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    a {
      color: var(--text-sub);
      text-decoration: none;
      transition: color 0.2s;
    }
    a:hover {
      color: var(--primary);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10, 10, 26, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(196, 78, 255, 0.2);
    }
    .nav-wrap {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 10px 0;
      flex-wrap: wrap;
      gap: 10px;
    }
    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }
    .ai-page-logo {
      height: 36px;
      width: auto;
    }
    .brand-text {
      font-size: 1.3rem;
      font-weight: 700;
      color: #fff;
      letter-spacing: 1px;
    }
    .brand-text span {
      color: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
      flex-wrap: wrap;
    }
    .nav-links li a {
      display: block;
      padding: 6px 12px;
      font-size: 0.9rem;
      color: var(--text-sub);
      border-radius: 20px;
      transition: background 0.2s, color 0.2s;
      white-space: nowrap;
    }
    .nav-links li a:hover {
      background: rgba(196, 78, 255, 0.2);
      color: #fff;
    }
    .nav-cta {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .btn {
      display: inline-block;
      padding: 10px 24px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 0.9rem;
      text-align: center;
      transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
      cursor: pointer;
      border: none;
      line-height: 1.4;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: #fff;
      box-shadow: 0 4px 18px rgba(196, 78, 255, 0.4);
    }
    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 28px rgba(196, 78, 255, 0.6);
      color: #fff;
    }
    .btn-outline {
      background: transparent;
      border: 1px solid rgba(196, 78, 255, 0.6);
      color: var(--text-main);
    }
    .btn-outline:hover {
      background: rgba(196, 78, 255, 0.15);
      border-color: var(--primary);
      transform: translateY(-2px);
    }
    .btn-sm {
      padding: 8px 18px;
      font-size: 0.85rem;
    }
    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      font-size: 1.5rem;
      padding: 4px 10px;
      border-radius: 8px;
      cursor: pointer;
      line-height: 1;
    }
    /* 首屏Hero */
    .hero {
      position: relative;
      padding: 80px 0 60px;
      overflow: hidden;
      background: radial-gradient(ellipse at 70% 30%, rgba(196, 78, 255, 0.18) 0%, transparent 70%);
    }
    .hero::before {
      content: '';
      position: absolute;
      top: -20%;
      right: -10%;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(255, 77, 208, 0.12) 0%, transparent 70%);
      border-radius: 50%;
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #ffffff 0%, #e0b0ff 55%, #c44eff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 1.1rem;
      color: var(--text-sub);
      margin-bottom: 28px;
      max-width: 520px;
    }
    .hero-btns {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-bottom: 32px;
    }
    .hero-btns .btn {
      min-width: 160px;
    }
    .hero-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }
    .badge {
      background: rgba(196, 78, 255, 0.15);
      border: 1px solid rgba(196, 78, 255, 0.3);
      padding: 5px 14px;
      border-radius: 40px;
      font-size: 0.8rem;
      color: var(--text-sub);
    }
    .hero-visual {
      display: flex;
      flex-direction: column;
      gap: 16px;
      align-items: stretch;
    }
    .hero-data-card {
      background: var(--bg-card);
      border: 1px solid var(--border-glow);
      border-radius: var(--radius-md);
      padding: 18px 22px;
      backdrop-filter: blur(10px);
      display: flex;
      justify-content: space-between;
      align-items: center;
      animation: floatCard 5s ease-in-out infinite alternate;
    }
    .hero-data-card:nth-child(2) { animation-delay: 0.8s; }
    .hero-data-card:nth-child(3) { animation-delay: 1.6s; }
    @keyframes floatCard {
      0% { transform: translateY(0); }
      100% { transform: translateY(-8px); }
    }
    .data-num {
      font-size: 1.8rem;
      font-weight: 800;
      color: #fff;
      line-height: 1.2;
    }
    .data-num small {
      font-size: 0.85rem;
      font-weight: 400;
      color: var(--text-sub);
      margin-left: 4px;
    }
    .data-label {
      font-size: 0.85rem;
      color: var(--text-dim);
    }
    .data-tag {
      background: rgba(0, 229, 255, 0.12);
      color: var(--accent-cyan);
      padding: 4px 12px;
      border-radius: 30px;
      font-size: 0.75rem;
      font-weight: 600;
    }
    /* 区块通用 */
    section {
      padding: 70px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-header h2 {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: #fff;
    }
    .section-header p {
      font-size: 1rem;
      color: var(--text-sub);
      max-width: 700px;
      margin: 0 auto;
    }
    .accent-line {
      display: inline-block;
      width: 60px;
      height: 4px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
      border-radius: 4px;
      margin-top: 16px;
    }
    /* 关于我们 + 指标卡 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      align-items: stretch;
    }
    .about-text {
      background: var(--bg-card);
      border: 1px solid rgba(196, 78, 255, 0.2);
      border-radius: var(--radius-lg);
      padding: 32px;
      backdrop-filter: blur(8px);
    }
    .about-text h3 {
      font-size: 1.5rem;
      margin-bottom: 16px;
      color: #fff;
    }
    .about-text p {
      color: var(--text-sub);
      margin-bottom: 14px;
      font-size: 0.95rem;
    }
    .about-text .highlight {
      color: var(--primary);
      font-weight: 600;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .metric-card {
      background: var(--bg-card);
      border: 1px solid rgba(196, 78, 255, 0.15);
      border-radius: var(--radius-md);
      padding: 24px 18px;
      text-align: center;
      transition: transform 0.25s, box-shadow 0.25s;
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-glow);
    }
    .metric-card .m-num {
      font-size: 1.9rem;
      font-weight: 800;
      color: var(--primary);
    }
    .metric-card .m-label {
      font-size: 0.85rem;
      color: var(--text-sub);
      margin-top: 4px;
    }
    /* 服务能力卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
      gap: 20px;
    }
    .service-card {
      background: var(--bg-card);
      border: 1px solid rgba(196, 78, 255, 0.15);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 40px rgba(196, 78, 255, 0.25);
      border-color: rgba(196, 78, 255, 0.5);
    }
    .service-icon {
      width: 44px;
      height: 44px;
      background: rgba(196, 78, 255, 0.15);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      font-size: 1.4rem;
    }
    .service-card h3 {
      font-size: 1.1rem;
      margin-bottom: 10px;
      color: #fff;
    }
    .service-card p {
      font-size: 0.88rem;
      color: var(--text-sub);
      line-height: 1.5;
    }
    /* 模型标签云 */
    .model-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 20px;
    }
    .model-tag {
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(196, 78, 255, 0.25);
      padding: 7px 18px;
      border-radius: 40px;
      font-size: 0.85rem;
      color: var(--text-sub);
      transition: background 0.2s, color 0.2s, transform 0.2s;
    }
    .model-tag:hover {
      background: rgba(196, 78, 255, 0.25);
      color: #fff;
      transform: scale(1.05);
    }
    /* 流程步骤 */
    .steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }
    .step-item {
      position: relative;
      background: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 30px 16px 24px;
      border: 1px solid rgba(196, 78, 255, 0.15);
    }
    .step-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      font-weight: 800;
      font-size: 1.2rem;
      color: #fff;
      margin-bottom: 16px;
    }
    .step-item h4 {
      font-size: 1rem;
      margin-bottom: 8px;
      color: #fff;
    }
    .step-item p {
      font-size: 0.85rem;
      color: var(--text-sub);
    }
    /* 对比评测 */
    .compare-wrap {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 28px;
      align-items: start;
    }
    .compare-table-wrap {
      overflow-x: auto;
      border-radius: var(--radius-md);
      border: 1px solid rgba(196, 78, 255, 0.2);
    }
    table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.88rem;
      min-width: 500px;
    }
    th, td {
      padding: 14px 16px;
      text-align: left;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }
    th {
      background: rgba(196, 78, 255, 0.12);
      color: #fff;
      font-weight: 600;
    }
    td {
      color: var(--text-sub);
    }
    tr:last-child td {
      border-bottom: none;
    }
    .rating-card {
      background: var(--bg-card);
      border: 1px solid rgba(196, 78, 255, 0.3);
      border-radius: var(--radius-md);
      padding: 30px;
      text-align: center;
    }
    .rating-stars {
      font-size: 1.6rem;
      color: #ffd700;
      letter-spacing: 4px;
      margin-bottom: 12px;
    }
    .rating-score {
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
    }
    .rating-score small {
      font-size: 1rem;
      color: var(--text-dim);
      font-weight: 400;
    }
    .rating-label {
      font-size: 1rem;
      color: var(--text-sub);
      margin-top: 8px;
    }
    /* 案例中心 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
      gap: 18px;
    }
    .case-card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid rgba(196, 78, 255, 0.15);
      transition: transform 0.25s, box-shadow 0.25s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 32px rgba(196, 78, 255, 0.2);
    }
    .case-card .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      background: #1a1030;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-dim);
      font-size: 0.8rem;
    }
    .case-card .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-card .case-body {
      padding: 16px;
    }
    .case-card h4 {
      font-size: 0.95rem;
      color: #fff;
      margin-bottom: 6px;
    }
    .case-card p {
      font-size: 0.8rem;
      color: var(--text-sub);
    }
    /* 评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 20px;
    }
    .review-card {
      background: var(--bg-card);
      border: 1px solid rgba(196, 78, 255, 0.12);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: transform 0.2s;
    }
    .review-card:hover {
      transform: translateY(-3px);
      border-color: rgba(196, 78, 255, 0.35);
    }
    .review-text {
      font-size: 0.9rem;
      color: var(--text-sub);
      margin-bottom: 18px;
      line-height: 1.6;
    }
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .review-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #fff;
      font-size: 0.9rem;
    }
    .review-name {
      font-size: 0.9rem;
      font-weight: 600;
      color: #fff;
    }
    .review-role {
      font-size: 0.75rem;
      color: var(--text-dim);
    }
    /* FAQ */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid rgba(196, 78, 255, 0.15);
      border-radius: var(--radius-sm);
      overflow: hidden;
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 18px 22px;
      text-align: left;
      font-size: 1rem;
      font-weight: 600;
      color: #fff;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-family: inherit;
      transition: background 0.2s;
    }
    .faq-question:hover {
      background: rgba(196, 78, 255, 0.12);
    }
    .faq-question .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.3s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s;
      padding: 0 22px;
      color: var(--text-sub);
      font-size: 0.92rem;
      line-height: 1.6;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 22px 18px;
    }
    /* 表单 */
    .form-wrap {
      max-width: 720px;
      margin: 0 auto;
      background: var(--bg-card);
      border: 1px solid rgba(196, 78, 255, 0.2);
      border-radius: var(--radius-lg);
      padding: 36px 32px;
      backdrop-filter: blur(8px);
    }
    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .form-group input,
    .form-group select,
    .form-group textarea {
      width: 100%;
      padding: 12px 16px;
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(196, 78, 255, 0.3);
      border-radius: var(--radius-sm);
      color: #fff;
      font-size: 0.92rem;
      font-family: inherit;
      transition: border-color 0.2s, box-shadow 0.2s;
    }
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(196, 78, 255, 0.2);
    }
    .form-group textarea {
      resize: vertical;
      min-height: 100px;
    }
    .form-group select option {
      background: #14142c;
      color: #fff;
    }
    .form-submit {
      width: 100%;
      padding: 14px;
      font-size: 1rem;
      margin-top: 8px;
    }
    /* 页脚 */
    .site-footer {
      background: #080814;
      border-top: 1px solid rgba(196, 78, 255, 0.2);
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.2fr;
      gap: 32px;
      margin-bottom: 36px;
    }
    .footer-brand p {
      font-size: 0.88rem;
      color: var(--text-sub);
      margin-top: 12px;
      line-height: 1.6;
    }
    .footer-col h4 {
      font-size: 0.95rem;
      color: #fff;
      margin-bottom: 14px;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col ul li {
      margin-bottom: 8px;
    }
    .footer-col ul li a {
      font-size: 0.85rem;
      color: var(--text-sub);
    }
    .footer-links-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px 16px;
      padding-top: 12px;
    }
    .footer-links-cloud a {
      font-size: 0.82rem;
      color: var(--text-dim);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 20px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 12px;
      font-size: 0.8rem;
      color: var(--text-dim);
    }
    .footer-bottom a {
      color: var(--text-dim);
    }
    /* 浮动客服 */
    .float-service {
      position: fixed;
      right: 20px;
      bottom: 80px;
      z-index: 200;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-service button,
    .float-service a {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      border: none;
      color: #fff;
      font-size: 1.2rem;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: 0 4px 16px rgba(196, 78, 255, 0.5);
      transition: transform 0.2s;
      text-decoration: none;
    }
    .float-service button:hover,
    .float-service a:hover {
      transform: scale(1.1);
    }
    .float-service .qr-pop {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #fff;
      padding: 10px;
      border-radius: 12px;
      box-shadow: 0 8px 30px rgba(0,0,0,0.5);
    }
    .float-service .qr-pop img {
      width: 140px;
      height: auto;
    }
    .float-service .qr-pop.show {
      display: block;
    }
    .back-top {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 200;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: rgba(196, 78, 255, 0.25);
      border: 1px solid var(--primary);
      color: #fff;
      font-size: 1.1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: background 0.2s;
      backdrop-filter: blur(6px);
    }
    .back-top:hover {
      background: rgba(196, 78, 255, 0.5);
    }
    /* 动画 */
    .fade-up {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }
    /* 响应式 */
    @media (max-width: 960px) {
      .hero-grid { grid-template-columns: 1fr; }
      .hero-content h1 { font-size: 2.4rem; }
      .about-grid { grid-template-columns: 1fr; }
      .compare-wrap { grid-template-columns: 1fr; }
      .steps { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        padding: 12px 0;
        order: 3;
      }
      .nav-links.open {
        display: flex;
      }
      .nav-links li a {
        padding: 10px 0;
        width: 100%;
      }
      .mobile-menu-btn { display: block; }
      .nav-cta .btn { display: none; }
      .hero-content h1 { font-size: 2rem; }
      .hero { padding: 50px 0 40px; }
      .section-header h2 { font-size: 1.6rem; }
      .form-row { grid-template-columns: 1fr; }
      .form-wrap { padding: 24px 18px; }
      .footer-grid { grid-template-columns: 1fr; gap: 24px; }
      .steps { grid-template-columns: 1fr; }
      .metrics-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 480px) {
      .container { padding: 0 16px; }
      .hero-content h1 { font-size: 1.7rem; }
      .hero-data-card { padding: 14px 16px; }
      .data-num { font-size: 1.4rem; }
      .btn { padding: 10px 18px; font-size: 0.85rem; }
    }