:root {
      --bg-page: #0d1117;
      --bg-page-light: #f6f8fb;
      --surface-card: #ffffff;
      --surface-card-soft: #f0f4f9;
      --text-main: #141b2b;
      --text-sub: #526075;
      --text-muted: #7b8a9e;
      --neon-cyan: #00e5ff;
      --neon-purple: #8a2be2;
      --neon-blue: #0066ff;
      --neon-lime: #10b981;
      --neon-amber: #f59e0b;
      --border-color: #e2e8f0;
      --border-glow: rgba(0, 229, 255, 0.25);
      --container-max: 1200px;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 10px 25px rgba(20, 27, 43, 0.06);
      --shadow-neon: 0 0 25px rgba(0, 229, 255, 0.18);
      --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-page-light);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.6;
    }
    body {
      background: radial-gradient(circle at 10% 0%, rgba(0, 229, 255, 0.07) 0%, transparent 35%),
                  radial-gradient(circle at 90% 15%, rgba(138, 43, 226, 0.06) 0%, transparent 35%),
                  radial-gradient(circle at 50% 80%, rgba(16, 185, 129, 0.05) 0%, transparent 40%),
                  var(--bg-page-light);
      color: var(--text-main);
      min-height: 100vh;
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    .section-spacing {
      padding-top: 80px;
      padding-bottom: 80px;
    }
    .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 16px;
      background: rgba(0, 102, 255, 0.08);
      color: var(--neon-blue);
      border: 1px solid rgba(0, 102, 255, 0.2);
      border-radius: 999px;
      font-size: 0.875rem;
      font-weight: 600;
      letter-spacing: 0.5px;
      box-shadow: 0 2px 8px rgba(0, 102, 255, 0.06);
    }
    .badge-pill::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--neon-cyan);
      box-shadow: 0 0 8px var(--neon-cyan);
    }
    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 50px;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--text-main);
      margin-top: 14px;
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-sub);
      line-height: 1.7;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }
    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-logo-wrap .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }
    .brand-text {
      display: flex;
      flex-direction: column;
    }
    .brand-text .title {
      font-size: 1.25rem;
      font-weight: 800;
      background: linear-gradient(135deg, #0066ff 0%, #8a2be2 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      line-height: 1.2;
    }
    .brand-text .sub {
      font-size: 0.75rem;
      color: var(--text-muted);
      letter-spacing: 0.5px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links a {
      padding: 8px 14px;
      font-size: 0.93rem;
      font-weight: 500;
      color: var(--text-sub);
      border-radius: var(--radius-sm);
    }
    .nav-links a:hover {
      color: var(--neon-blue);
      background: rgba(0, 102, 255, 0.05);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-portal {
      padding: 9px 20px;
      background: linear-gradient(135deg, #0066ff 0%, #00e5ff 100%);
      color: #ffffff;
      font-weight: 600;
      font-size: 0.9rem;
      border-radius: var(--radius-sm);
      box-shadow: 0 4px 15px rgba(0, 102, 255, 0.25);
      border: none;
      cursor: pointer;
    }
    .btn-nav-portal:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 229, 255, 0.4);
      color: #ffffff;
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      padding: 6px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 首屏 Hero (无图片) */
    .hero-section {
      padding-top: 70px;
      padding-bottom: 80px;
      position: relative;
      overflow: hidden;
      background: linear-gradient(180deg, rgba(255, 255, 255, 0.85) 0%, rgba(240, 244, 250, 0.6) 100%);
      border-bottom: 1px solid var(--border-color);
    }
    .hero-glow-1 {
      position: absolute;
      top: -80px;
      left: 20%;
      width: 320px;
      height: 320px;
      background: radial-gradient(circle, rgba(0, 229, 255, 0.2) 0%, transparent 70%);
      filter: blur(50px);
      pointer-events: none;
    }
    .hero-glow-2 {
      position: absolute;
      bottom: -60px;
      right: 15%;
      width: 360px;
      height: 360px;
      background: radial-gradient(circle, rgba(138, 43, 226, 0.15) 0%, transparent 70%);
      filter: blur(60px);
      pointer-events: none;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }
    .hero-h1 {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.25;
      letter-spacing: -1px;
      margin-top: 20px;
      margin-bottom: 24px;
      color: #0f172a;
    }
    .hero-gradient-text {
      background: linear-gradient(135deg, #0066ff 10%, #8a2be2 60%, #00e5ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }
    .hero-subhead {
      font-size: 1.25rem;
      color: var(--text-sub);
      max-width: 800px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }
    .hero-cta-box {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 40px;
    }
    .btn-portal-primary {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      padding: 16px 36px;
      background: linear-gradient(135deg, #0066ff 0%, #00d2ff 100%);
      color: #ffffff;
      font-size: 1.1rem;
      font-weight: 700;
      border-radius: var(--radius-md);
      box-shadow: 0 8px 30px rgba(0, 102, 255, 0.35);
      border: 1px solid rgba(255, 255, 255, 0.3);
      position: relative;
      overflow: hidden;
    }
    .btn-portal-primary:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 12px 36px rgba(0, 229, 255, 0.5);
      color: #ffffff;
    }
    .btn-portal-secondary {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 16px 32px;
      background: #ffffff;
      color: var(--text-main);
      font-size: 1.05rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .btn-portal-secondary:hover {
      border-color: var(--neon-cyan);
      background: #fafcff;
      color: var(--neon-blue);
      transform: translateY(-2px);
    }
    .hero-features-chips {
      display: flex;
      align-items: center;
      justify-content: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .feature-chip {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 14px;
      background: #ffffff;
      border: 1px solid rgba(0, 102, 255, 0.15);
      border-radius: var(--radius-sm);
      font-size: 0.88rem;
      color: var(--text-sub);
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.03);
    }
    .feature-chip svg {
      width: 16px;
      height: 16px;
      color: var(--neon-lime);
    }

    /* 数据指标栏 */
    .metric-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: -30px;
      position: relative;
      z-index: 10;
    }
    .metric-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 24px 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
      border-top: 3px solid var(--neon-blue);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-neon);
      border-top-color: var(--neon-cyan);
    }
    .metric-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.1;
      margin-bottom: 6px;
      font-family: inherit;
    }
    .metric-label {
      font-size: 0.9rem;
      color: var(--text-sub);
    }

    /* 卡片通用样式 */
    .card-base {
      background: var(--surface-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .card-base:hover {
      border-color: rgba(0, 229, 255, 0.6);
      box-shadow: 0 10px 30px rgba(0, 102, 255, 0.08);
      transform: translateY(-4px);
    }

    /* 模型矩阵徽章墙 */
    .models-marquee {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }
    .model-badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
      font-weight: 600;
      color: #334155;
      box-shadow: 0 2px 5px rgba(0,0,0,0.02);
      transition: var(--transition);
    }
    .model-badge:hover {
      border-color: var(--neon-purple);
      color: var(--neon-purple);
      transform: scale(1.05);
    }

    /* 栅格布局 */
    .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: 30px;
    }

    /* 场景卡片 */
    .scene-icon {
      width: 46px;
      height: 46px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(0, 102, 255, 0.1) 0%, rgba(0, 229, 255, 0.1) 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      color: var(--neon-blue);
    }
    .scene-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .scene-desc {
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 流程步骤 */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .flow-step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .step-badge {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--neon-blue);
      color: #ffffff;
      font-size: 0.9rem;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      box-shadow: 0 0 10px rgba(0, 102, 255, 0.4);
    }

    /* 对比表格 */
    .comparison-wrapper {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      min-width: 680px;
    }
    .comparison-table th, .comparison-table td {
      padding: 18px 20px;
      text-align: left;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }
    .comparison-table th {
      background: #f8fafc;
      color: var(--text-main);
      font-weight: 700;
    }
    .comparison-table tr:hover {
      background: #f8fbff;
    }
    .highlight-col {
      background: rgba(0, 102, 255, 0.03);
      font-weight: 600;
      color: var(--neon-blue);
    }
    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: linear-gradient(135deg, #10b981 0%, #00e5ff 100%);
      color: #ffffff;
      padding: 6px 14px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 0.9rem;
    }

    /* 案例展示 */
    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .case-media-box {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #e2e8f0;
      overflow: hidden;
    }
    .case-media-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: var(--transition);
    }
    .case-card:hover .case-media-box img {
      transform: scale(1.04);
    }
    .case-body {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

    /* 评论卡片 */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-stars {
      color: #f59e0b;
      margin-bottom: 12px;
      font-size: 1.1rem;
    }
    .testimonial-text {
      font-size: 0.94rem;
      color: var(--text-sub);
      line-height: 1.65;
      margin-bottom: 18px;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
    }
    .author-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, #0066ff, #00e5ff);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
    }
    .author-meta .name {
      font-weight: 700;
      font-size: 0.92rem;
      color: var(--text-main);
    }
    .author-meta .role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ折叠面板 */
    .faq-accordion {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-item:hover {
      border-color: rgba(0, 102, 255, 0.4);
    }
    .faq-question {
      padding: 18px 22px;
      font-weight: 600;
      font-size: 1.02rem;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }
    .faq-question svg {
      width: 18px;
      height: 18px;
      transition: transform 0.3s ease;
      color: var(--text-muted);
    }
    .faq-answer {
      display: none;
      padding: 0 22px 20px 22px;
      font-size: 0.94rem;
      color: var(--text-sub);
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-question svg {
      transform: rotate(180deg);
      color: var(--neon-blue);
    }

    /* 表单与需求匹配 */
    .form-container-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      margin-bottom: 8px;
      font-weight: 600;
      font-size: 0.92rem;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #fafbfc;
      color: var(--text-main);
      transition: var(--transition);
      outline: none;
    }
    .form-control:focus {
      border-color: var(--neon-blue);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.12);
    }
    textarea.form-control {
      min-height: 110px;
      resize: vertical;
    }
    .btn-submit-form {
      width: 100%;
      padding: 14px;
      background: linear-gradient(135deg, #0066ff 0%, #00e5ff 100%);
      color: #ffffff;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 1.05rem;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 4px 15px rgba(0, 102, 255, 0.3);
      transition: var(--transition);
    }
    .btn-submit-form:hover {
      box-shadow: 0 6px 22px rgba(0, 229, 255, 0.5);
      transform: translateY(-2px);
    }

    /* 资讯列表 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .article-item-card {
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 18px 24px;
      transition: var(--transition);
    }
    .article-item-card:hover {
      border-color: var(--neon-blue);
      transform: translateX(4px);
    }
    .article-title-link {
      font-size: 0.98rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .article-title-link:hover {
      color: var(--neon-blue);
    }

    /* 底部专属 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding-top: 60px;
      padding-bottom: 40px;
      color: var(--text-sub);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .footer-links-col {
      display: flex;
      flex-direction: column;
      gap: 10px;
      font-size: 0.9rem;
    }
    .footer-links-col a:hover {
      color: var(--neon-blue);
    }
    .friend-links-box {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
      font-size: 0.88rem;
    }
    .friend-links-box a {
      color: var(--text-sub);
    }
    .friend-links-box a:hover {
      color: var(--neon-blue);
    }
    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
      color: var(--text-muted);
      flex-wrap: wrap;
      gap: 12px;
    }

    /* 悬浮客服面板 */
    .floating-service {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: 0 6px 20px rgba(0,0,0,0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--text-main);
      transition: var(--transition);
      position: relative;
    }
    .float-btn:hover {
      background: var(--neon-blue);
      color: #ffffff;
      border-color: var(--neon-blue);
      transform: scale(1.08);
    }
    .float-btn svg {
      width: 22px;
      height: 22px;
    }
    .qr-tooltip {
      position: absolute;
      right: 64px;
      bottom: 0;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      padding: 12px;
      border-radius: var(--radius-md);
      display: none;
      width: 140px;
      text-align: center;
      font-size: 0.75rem;
      color: var(--text-sub);
    }
    .float-btn:hover .qr-tooltip {
      display: block;
    }
    .qr-tooltip img {
      width: 100%;
      height: auto;
      border-radius: 4px;
      margin-bottom: 6px;
      display: block;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .metric-grid { grid-template-columns: repeat(2, 1fr); margin-top: 20px; }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .flow-steps { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr; gap: 30px; }
      .hero-h1 { font-size: 2.3rem; }
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: absolute;
        top: 74px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        box-shadow: var(--shadow-md);
      }
      .nav-menu.active { display: block; }
      .nav-links { flex-direction: column; align-items: flex-start; }
      .nav-links a { width: 100%; padding: 10px 0; }
      .mobile-toggle { display: block; }
      .hero-h1 { font-size: 1.85rem; }
      .hero-subhead { font-size: 1rem; }
      .grid-3, .grid-4, .grid-2, .metric-grid, .flow-steps { grid-template-columns: 1fr; }
      .section-title { font-size: 1.75rem; }
      .form-container-card { padding: 24px 16px; }
      .floating-service { right: 14px; bottom: 20px; }
    }