:root {
      --primary: #6366f1;
      --primary-glow: #818cf8;
      --neon-cyan: #06b6d4;
      --neon-magenta: #ec4899;
      --neon-lime: #10b981;
      --neon-amber: #f59e0b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --bg-soft: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --border-glow: rgba(99, 102, 241, 0.25);
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
      --shadow-md: 0 4px 20px -2px rgba(99, 102, 241, 0.12), 0 2px 6px -1px rgba(0, 0, 0, 0.04);
      --shadow-neon: 0 0 20px rgba(6, 182, 212, 0.25), 0 0 40px rgba(236, 72, 153, 0.15);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --container-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-page);
    }

    body {
      line-height: 1.6;
      background: radial-gradient(circle at 10% 10%, rgba(236, 72, 153, 0.04) 0%, transparent 40%),
                  radial-gradient(circle at 90% 30%, rgba(6, 182, 212, 0.05) 0%, transparent 50%),
                  radial-gradient(circle at 50% 80%, rgba(99, 102, 241, 0.05) 0%, transparent 60%),
                  var(--bg-page);
      overflow-x: hidden;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: all 0.25s ease;
    }

    a:hover {
      color: var(--neon-magenta);
    }

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

    /* 顶部导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      box-shadow: 0 4px 16px rgba(15, 23, 42, 0.03);
    }

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

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

    .brand-box .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      background: linear-gradient(135deg, #0f172a 0%, #4338ca 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: rgba(99, 102, 241, 0.08);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.92rem;
      font-weight: 700;
      border-radius: var(--radius-full);
      border: 1px solid transparent;
      cursor: pointer;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      text-align: center;
      line-height: 1.2;
    }

    .btn-neon {
      background: linear-gradient(135deg, #ec4899 0%, #8b5cf6 50%, #06b6d4 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 15px rgba(236, 72, 153, 0.35);
      border: none;
    }

    .btn-neon:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 22px rgba(6, 182, 212, 0.45);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--primary);
      border-color: var(--primary);
    }

    .btn-outline:hover {
      background: rgba(99, 102, 241, 0.06);
      transform: translateY(-2px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 6px 10px;
      border-radius: 6px;
      cursor: pointer;
      font-size: 1.1rem;
      color: var(--text-main);
    }

    /* 首屏 Hero (无图片，霓虹几何纯CSS质感) */
    .hero-section {
      padding: 64px 0 54px;
      position: relative;
    }

    .hero-inner {
      text-align: center;
      max-width: 920px;
      margin: 0 auto;
    }

    .neon-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      border-radius: var(--radius-full);
      background: linear-gradient(90deg, rgba(236, 72, 153, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
      border: 1px solid rgba(236, 72, 153, 0.3);
      color: #be185d;
      font-size: 0.85rem;
      font-weight: 700;
      margin-bottom: 24px;
      box-shadow: 0 2px 10px rgba(236, 72, 153, 0.1);
    }

    .hero-title {
      font-size: 2.5rem;
      line-height: 1.25;
      font-weight: 900;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }

    .hero-title span {
      background: linear-gradient(120deg, #ec4899 0%, #6366f1 50%, #06b6d4 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.12rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 44px;
    }

    .btn-hero-glow {
      padding: 14px 34px;
      font-size: 1.05rem;
    }

    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
      padding: 16px 20px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }

    .model-badge {
      display: inline-block;
      padding: 4px 10px;
      border-radius: 6px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      font-size: 0.78rem;
      font-weight: 600;
      color: #334155;
      transition: all 0.2s ease;
    }

    .model-badge:hover {
      border-color: var(--neon-cyan);
      color: var(--neon-cyan);
      background: #ecfeff;
      transform: translateY(-1px);
    }

    /* 通用Section */
    section.page-section {
      padding: 60px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 40px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--neon-magenta);
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 数据指标卡 */
    .stat-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-bottom: 30px;
    }

    .stat-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .stat-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, #ec4899, #06b6d4);
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(99, 102, 241, 0.4);
    }

    .stat-num {
      font-size: 2.2rem;
      font-weight: 900;
      background: linear-gradient(135deg, #0f172a 30%, #6366f1 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-muted);
    }

    /* 网格卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

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

    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: linear-gradient(135deg, rgba(236, 72, 153, 0.1), rgba(6, 182, 212, 0.1));
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      font-weight: 800;
      margin-bottom: 16px;
      border: 1px solid rgba(99, 102, 241, 0.2);
    }

    .card-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

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

    .badge-tag {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 4px;
      background: #e0e7ff;
      color: #4338ca;
      margin-bottom: 8px;
    }

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

    .step-item {
      background: #ffffff;
      padding: 24px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .step-idx {
      font-size: 1.8rem;
      font-weight: 900;
      color: #cbd5e1;
      margin-bottom: 8px;
    }

    .step-title {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .step-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 对比评测表格 */
    .comparison-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-md);
    }

    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, rgba(236, 72, 153, 0.08) 0%, rgba(6, 182, 212, 0.08) 100%);
      padding: 20px 28px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(99, 102, 241, 0.25);
      margin-bottom: 24px;
      flex-wrap: wrap;
      gap: 16px;
    }

    .rating-left h3 {
      font-size: 1.3rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .rating-score {
      font-size: 2.2rem;
      font-weight: 900;
      color: #be185d;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 1.2rem;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
    }

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .eval-table th, .eval-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }

    .eval-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

    .eval-table td.highlight {
      font-weight: 700;
      color: #4338ca;
      background: rgba(99, 102, 241, 0.04);
    }

    /* 案例中心图文 */
    .media-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .media-img-wrap {
      width: 100%;
      overflow: hidden;
      background: #e2e8f0;
    }

    .media-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.4s ease;
    }

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

    .media-body {
      padding: 20px;
    }

    .media-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .media-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* FAQ 折叠 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.25s ease;
    }

    .faq-item.active {
      border-color: var(--primary);
      box-shadow: 0 4px 12px rgba(99, 102, 241, 0.1);
    }

    .faq-question {
      padding: 16px 20px;
      font-weight: 700;
      font-size: 0.98rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      color: var(--text-main);
      user-select: none;
    }

    .faq-question:hover {
      color: var(--primary);
    }

    .faq-icon {
      font-size: 1.1rem;
      transition: transform 0.3s ease;
      color: var(--text-light);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      padding: 0 20px;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.6;
      background: #fafafa;
    }

    .faq-item.active .faq-answer {
      max-height: 500px;
      padding: 14px 20px 18px;
      transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
    }

    /* 评论卡片 */
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }

    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #ec4899, #06b6d4);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .review-author {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .review-role {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    .review-text {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 12px;
    }

    .review-stars {
      color: #f59e0b;
      font-size: 0.85rem;
    }

    /* 表单与联系区 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 16px;
    }

    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      font-size: 0.92rem;
      color: var(--text-main);
      background: #f8fafc;
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    }

    textarea.form-control {
      min-height: 110px;
      resize: vertical;
    }

    .contact-info-panel {
      background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 0.92rem;
      color: var(--text-muted);
      margin-bottom: 20px;
    }

    .contact-list li {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .contact-list strong {
      color: var(--text-main);
    }

    .qr-box {
      text-align: center;
      padding: 16px;
      background: #ffffff;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      max-width: 200px;
      margin: 0 auto;
    }

    .qr-box img {
      max-width: 120px;
      height: auto;
      margin-bottom: 6px;
      border-radius: 4px;
    }

    .qr-caption {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* 资讯与外链板块 */
    .article-list-wrap {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 18px;
      transition: all 0.2s ease;
    }

    .article-item:hover {
      border-color: var(--primary);
      transform: translateX(4px);
    }

    .article-link {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--text-main);
      display: block;
      margin-bottom: 6px;
    }

    .article-link:hover {
      color: var(--primary);
    }

    .article-date {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* 底部 Footer */
    footer.site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 50px 0 30px;
      border-top: 1px solid #1e293b;
      margin-top: 60px;
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 32px;
      padding-bottom: 36px;
      border-bottom: 1px solid #1e293b;
    }

    .footer-brand h4 {
      color: #f8fafc;
      font-size: 1.2rem;
      font-weight: 800;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.88rem;
      line-height: 1.6;
      max-width: 320px;
    }

    .footer-col h5 {
      color: #f8fafc;
      font-size: 0.95rem;
      font-weight: 700;
      margin-bottom: 14px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links li a {
      color: #94a3b8;
      font-size: 0.88rem;
    }

    .footer-links li a:hover {
      color: #38bdf8;
    }

    .footer-friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .footer-friend-links a {
      color: #94a3b8;
      font-size: 0.85rem;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
    }

    .footer-friend-links a:hover {
      color: #ffffff;
      background: #334155;
    }

    .footer-bottom {
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
      flex-wrap: wrap;
      gap: 12px;
    }

    .footer-bottom a {
      color: #94a3b8;
    }

    /* 浮动操作 */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: #ffffff;
      border-radius: var(--radius-full);
      padding: 10px 18px;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
      border: 1px solid rgba(99, 102, 241, 0.3);
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .float-kefu:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-neon);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .stat-grid, .grid-4, .steps-wrap {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-3, .grid-2, .stat-grid, .grid-4, .steps-wrap, .article-list-wrap {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        align-items: flex-start;
      }
    }