* {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
      background: #f8faff;
      color: #1e293b;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 霓虹亮彩风背景基底 */
    .page-bg {
      position: fixed;
      inset: 0;
      z-index: -1;
      background:
        radial-gradient(circle at 12% 18%, rgba(0, 180, 255, 0.08) 0%, transparent 45%),
        radial-gradient(circle at 88% 32%, rgba(160, 90, 255, 0.07) 0%, transparent 50%),
        radial-gradient(circle at 50% 90%, rgba(0, 220, 200, 0.05) 0%, transparent 55%),
        linear-gradient(145deg, #f0f6ff 0%, #fafcff 40%, #f4f7fd 100%);
      pointer-events: none;
    }
    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0, 120, 255, 0.08);
      box-shadow: 0 4px 24px rgba(0, 80, 200, 0.04);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      min-height: 72px;
      gap: 20px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }
    .ai-page-logo {
      max-width: 150px;
      height: auto;
      display: block;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      flex-wrap: wrap;
      list-style: none;
    }
    .nav-links a {
      display: block;
      padding: 8px 14px;
      color: #1e3a5f;
      font-size: 0.94rem;
      font-weight: 500;
      text-decoration: none;
      border-radius: 8px;
      transition: background 0.2s, color 0.2s, transform 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      background: rgba(0, 140, 255, 0.08);
      color: #0066ff;
      transform: translateY(-1px);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      padding: 10px 22px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 0.94rem;
      text-decoration: none;
      cursor: pointer;
      border: none;
      transition: all 0.25s ease;
      white-space: nowrap;
      line-height: 1.3;
    }
    .btn-primary {
      background: linear-gradient(105deg, #0066ff, #00a3ff, #4f7dff);
      color: #fff;
      box-shadow: 0 8px 22px -6px rgba(0, 110, 255, 0.4);
    }
    .btn-primary:hover {
      box-shadow: 0 12px 28px -6px rgba(0, 110, 255, 0.55);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: #fff;
      color: #0066ff;
      border: 1.5px solid rgba(0, 102, 255, 0.3);
    }
    .btn-outline:hover {
      background: rgba(0, 102, 255, 0.05);
      border-color: #0066ff;
      transform: translateY(-2px);
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      line-height: 1;
      color: #0a2540;
      cursor: pointer;
      padding: 4px 8px;
    }
    /* 首屏 hero */
    .hero {
      padding: 70px 0 60px;
      position: relative;
      overflow: hidden;
    }
    .hero::after {
      content: '';
      position: absolute;
      width: 520px;
      height: 520px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(0, 163, 255, 0.12) 0%, transparent 70%);
      top: -120px;
      right: -120px;
      z-index: 0;
      pointer-events: none;
    }
    .hero .container {
      position: relative;
      z-index: 1;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
    }
    .hero-content {
      flex: 1 1 480px;
    }
    .hero-badge {
      display: inline-block;
      background: rgba(0, 110, 255, 0.1);
      color: #0066ff;
      font-size: 0.85rem;
      font-weight: 600;
      padding: 6px 16px;
      border-radius: 40px;
      margin-bottom: 20px;
      letter-spacing: 0.4px;
      border: 1px solid rgba(0, 110, 255, 0.15);
      animation: fadeInUp 0.6s ease;
    }
    .hero h1 {
      font-size: 2.9rem;
      font-weight: 800;
      line-height: 1.2;
      color: #0a1e3c;
      margin-bottom: 22px;
      letter-spacing: -0.02em;
      animation: fadeInUp 0.7s ease 0.1s both;
    }
    .hero h1 span {
      background: linear-gradient(120deg, #0066ff, #00b4ff, #6a5cff);
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }
    .hero-desc {
      font-size: 1.12rem;
      color: #3a4d66;
      max-width: 560px;
      margin-bottom: 30px;
      animation: fadeInUp 0.7s ease 0.2s both;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      margin-bottom: 28px;
      animation: fadeInUp 0.7s ease 0.3s both;
    }
    .hero-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      color: #5e6f88;
      font-size: 0.92rem;
      animation: fadeInUp 0.7s ease 0.4s both;
    }
    .hero-meta span {
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .hero-visual {
      flex: 1 1 320px;
      display: flex;
      flex-direction: column;
      gap: 18px;
      animation: fadeInUp 0.8s ease 0.2s both;
    }
    .stat-card {
      background: rgba(255, 255, 255, 0.75);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.9);
      border-radius: 24px;
      padding: 24px 28px;
      box-shadow: 0 20px 40px -16px rgba(0, 80, 200, 0.18);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 28px 50px -18px rgba(0, 80, 200, 0.25);
    }
    .stat-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: #0066ff;
      line-height: 1.1;
    }
    .stat-label {
      font-size: 0.9rem;
      color: #4b5e77;
    }
    .stat-highlight {
      background: linear-gradient(135deg, #f0f7ff, #ffffff);
    }
    /* 通用区块 */
    .section {
      padding: 72px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }
    .section-label {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: #0066ff;
      background: rgba(0, 110, 255, 0.08);
      padding: 4px 14px;
      border-radius: 40px;
      margin-bottom: 14px;
    }
    .section-header h2 {
      font-size: 2.1rem;
      font-weight: 750;
      color: #0a1e3c;
      margin-bottom: 12px;
      letter-spacing: -0.01em;
    }
    .section-header p {
      font-size: 1.05rem;
      color: #52637c;
    }
    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 28px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 24px;
    }
    .card {
      background: #ffffff;
      border-radius: 24px;
      padding: 30px 26px;
      border: 1px solid rgba(0, 100, 255, 0.06);
      box-shadow: 0 12px 30px -12px rgba(0, 60, 150, 0.08);
      transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
    }
    .card:hover {
      transform: translateY(-5px);
      box-shadow: 0 24px 46px -16px rgba(0, 90, 210, 0.18);
      border-color: rgba(0, 110, 255, 0.18);
    }
    .card-icon {
      width: 52px;
      height: 52px;
      border-radius: 16px;
      background: linear-gradient(135deg, #e8f2ff, #d6e9ff);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      margin-bottom: 20px;
    }
    .card h3 {
      font-size: 1.24rem;
      font-weight: 700;
      color: #0a1e3c;
      margin-bottom: 10px;
    }
    .card p {
      color: #52637c;
      font-size: 0.96rem;
      line-height: 1.65;
    }
    /* 流程步骤 */
    .steps {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      justify-content: center;
      counter-reset: step;
    }
    .step-item {
      flex: 1 1 180px;
      background: #fff;
      border-radius: 20px;
      padding: 28px 20px;
      text-align: center;
      box-shadow: 0 8px 24px -10px rgba(0, 50, 120, 0.08);
      border: 1px solid rgba(0, 110, 255, 0.06);
      position: relative;
      transition: transform 0.25s;
    }
    .step-item:hover {
      transform: translateY(-4px);
    }
    .step-num {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #0066ff, #4d9aff);
      color: #fff;
      font-weight: 800;
      margin-bottom: 14px;
      font-size: 1.1rem;
    }
    .step-item h4 {
      font-size: 1.05rem;
      font-weight: 700;
      color: #0a1e3c;
      margin-bottom: 6px;
    }
    .step-item p {
      font-size: 0.9rem;
      color: #5e7089;
    }
    /* 对比评测表格 */
    .compare-wrap {
      overflow-x: auto;
      background: #fff;
      border-radius: 28px;
      border: 1px solid rgba(0, 110, 255, 0.08);
      box-shadow: 0 12px 36px -12px rgba(0, 50, 120, 0.08);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 720px;
      font-size: 0.95rem;
    }
    .compare-table th {
      background: #f4f9ff;
      color: #0a1e3c;
      font-weight: 700;
      padding: 18px 22px;
      text-align: left;
      border-bottom: 1px solid #e6efff;
    }
    .compare-table td {
      padding: 16px 22px;
      border-bottom: 1px solid #edf3fc;
      color: #1e3a5f;
      vertical-align: middle;
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }
    .compare-table .highlight-cell {
      background: #f5faff;
      font-weight: 600;
      color: #0066ff;
    }
    .rating-stars {
      color: #ffb800;
      font-size: 1.1rem;
      letter-spacing: 2px;
    }
    .score-badge {
      display: inline-block;
      background: linear-gradient(135deg, #0066ff, #00b4ff);
      color: #fff;
      padding: 4px 14px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 0.95rem;
    }
    /* FAQ */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 880px;
      margin: 0 auto;
    }
    .faq-item {
      background: #fff;
      border-radius: 18px;
      border: 1px solid rgba(0, 110, 255, 0.08);
      transition: box-shadow 0.2s;
    }
    .faq-item:hover {
      box-shadow: 0 8px 20px -8px rgba(0, 70, 180, 0.08);
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 18px 24px;
      font-weight: 600;
      color: #0a1e3c;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 1rem;
      gap: 16px;
    }
    .faq-question .arrow {
      font-size: 1.3rem;
      color: #0066ff;
      transition: transform 0.25s;
      flex-shrink: 0;
    }
    .faq-item.active .arrow {
      transform: rotate(180deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0 24px;
      color: #4a5e7a;
      font-size: 0.95rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px;
    }
    /* 评论卡片 */
    .testimonials {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }
    .testimonial-card {
      background: #fff;
      border-radius: 24px;
      padding: 28px;
      border: 1px solid rgba(0, 110, 255, 0.05);
      box-shadow: 0 10px 26px -12px rgba(0, 50, 120, 0.08);
      transition: transform 0.25s;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .testimonial-card:hover {
      transform: translateY(-3px);
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .testimonial-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #cce0ff, #a0c4ff);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #0044aa;
      font-size: 1.1rem;
    }
    .testimonial-name {
      font-weight: 700;
      color: #0a1e3c;
      font-size: 0.98rem;
    }
    .testimonial-role {
      font-size: 0.82rem;
      color: #6b7f9c;
    }
    .testimonial-text {
      color: #3d5069;
      font-size: 0.96rem;
      line-height: 1.65;
    }
    /* 案例展示 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 24px;
    }
    .case-item {
      background: #fff;
      border-radius: 22px;
      overflow: hidden;
      border: 1px solid rgba(0, 110, 255, 0.06);
      box-shadow: 0 10px 24px -12px rgba(0, 50, 120, 0.08);
      transition: transform 0.25s;
    }
    .case-item:hover {
      transform: scale(1.01);
    }
    .case-img-wrap {
      aspect-ratio: 16/10;
      background: #eef5ff;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }
    .case-info {
      padding: 18px 22px 22px;
    }
    .case-info h4 {
      font-size: 1.05rem;
      font-weight: 700;
      color: #0a1e3c;
      margin-bottom: 6px;
    }
    .case-info p {
      font-size: 0.9rem;
      color: #5c6f8a;
    }
    /* 文章列表 */
    .article-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
    }
    .article-item {
      background: #fff;
      border-radius: 18px;
      padding: 20px 22px;
      border: 1px solid rgba(0, 110, 255, 0.06);
      display: flex;
      flex-direction: column;
      gap: 8px;
      transition: background 0.2s, transform 0.2s;
    }
    .article-item:hover {
      background: #f8fcff;
      transform: translateX(3px);
    }
    .article-item a {
      color: #0066ff;
      font-weight: 600;
      text-decoration: none;
      font-size: 0.98rem;
    }
    .article-item .article-desc {
      font-size: 0.88rem;
      color: #60738f;
    }
    /* 表单 */
    .form-container {
      background: #fff;
      border-radius: 32px;
      padding: 40px;
      box-shadow: 0 20px 50px -20px rgba(0, 50, 120, 0.12);
      border: 1px solid rgba(0, 110, 255, 0.06);
      max-width: 760px;
      margin: 0 auto;
    }
    .form-row {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      margin-bottom: 20px;
    }
    .form-group {
      flex: 1 1 220px;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group label {
      font-size: 0.88rem;
      font-weight: 600;
      color: #1e3a5f;
    }
    .form-group input,
    .form-group select,
    .form-group textarea {
      width: 100%;
      padding: 12px 16px;
      border-radius: 12px;
      border: 1px solid #d9e6ff;
      background: #fafdff;
      font-size: 0.95rem;
      color: #0a1e3c;
      transition: border 0.2s, box-shadow 0.2s;
      font-family: inherit;
    }
    .form-group input:focus,
    .form-group select:focus,
    .form-group textarea:focus {
      outline: none;
      border-color: #0066ff;
      box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.12);
    }
    .form-group textarea {
      resize: vertical;
      min-height: 100px;
    }
    .submit-btn {
      width: 100%;
      padding: 14px;
      font-size: 1rem;
      border-radius: 50px;
      margin-top: 6px;
    }
    /* 页脚 */
    .site-footer {
      background: #0b1c33;
      color: #d4e2f5;
      padding: 48px 0 28px;
      margin-top: 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 36px;
    }
    .footer-brand .ai-page-logo {
      max-width: 140px;
      margin-bottom: 16px;
      
    }
    .footer-brand p {
      font-size: 0.9rem;
      color: #9db4d4;
      line-height: 1.7;
    }
    .footer-col h4 {
      color: #fff;
      font-size: 1rem;
      margin-bottom: 16px;
      font-weight: 600;
    }
    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-col a {
      color: #a7bddb;
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s;
    }
    .footer-col a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 12px;
      font-size: 0.88rem;
      color: #8ba3c7;
    }
    .footer-bottom a {
      color: #aac1e0;
      text-decoration: none;
    }
    /* 浮动客服 */
    .float-kefu {
      position: fixed;
      bottom: 32px;
      right: 28px;
      z-index: 200;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
    }
    .kefu-btn {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      background: linear-gradient(135deg, #0066ff, #4d9aff);
      box-shadow: 0 12px 28px -8px rgba(0, 80, 220, 0.4);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 1.5rem;
      border: none;
      cursor: pointer;
      transition: transform 0.2s;
    }
    .kefu-btn:hover {
      transform: scale(1.05);
    }
    .kefu-pop {
      display: none;
      position: absolute;
      bottom: 68px;
      right: 0;
      background: #fff;
      border-radius: 20px;
      padding: 16px;
      box-shadow: 0 16px 40px -12px rgba(0, 40, 100, 0.25);
      text-align: center;
      width: 190px;
    }
    .kefu-pop img {
      width: 140px;
      height: 140px;
      border-radius: 12px;
      object-fit: cover;
      margin-bottom: 8px;
    }
    .kefu-pop p {
      font-size: 0.82rem;
      color: #2b405b;
    }
    .float-kefu.open .kefu-pop {
      display: block;
    }
    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(24px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
    /* 响应式 */
    @media (max-width: 960px) {
      .hero h1 { font-size: 2.2rem; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 760px) {
      .header-inner { flex-wrap: wrap; min-height: auto; padding: 12px 0; }
      .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        padding: 12px 0 4px;
        order: 3;
      }
      .nav-links.open { display: flex; }
      .nav-links a { width: 100%; padding: 10px 12px; }
      .mobile-menu-btn { display: block; }
      .hero { padding: 48px 0 40px; }
      .hero h1 { font-size: 1.9rem; }
      .form-container { padding: 24px; }
      .footer-grid { grid-template-columns: 1fr; gap: 28px; }
      .float-kefu { bottom: 18px; right: 16px; }
    }
    @media (max-width: 480px) {
      .hero h1 { font-size: 1.6rem; }
      .section-header h2 { font-size: 1.6rem; }
      .btn { padding: 9px 18px; font-size: 0.88rem; }
    }
    /* 滚动渐入 */
    .fade-in-section {
      opacity: 0;
      transform: translateY(28px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .fade-in-section.visible {
      opacity: 1;
      transform: translateY(0);
    }