/* roulang page: index */
:root {
      --bg-main: #F8FAFC;
      --bg-alt: #F1F5F9;
      --bg-dark: #030712;
      --bg-dark-card: #0B132B;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-light: #94A3B8;
      --primary: #0A5C36;
      --accent: #10B981;
      --accent-blue: #0284C7;
      --border-color: #E2E8F0;
      --border-dark: #1E293B;
      --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 10px 15px -3px rgba(15, 23, 42, 0.06);
      --shadow-lg: 0 20px 25px -5px rgba(15, 23, 42, 0.1);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 14px;
      --container-max: 1240px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.65;
      letter-spacing: 0.015em;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, textarea {
      font-family: inherit;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    .section-py {
      padding: 96px 0;
    }
    @media (max-width: 768px) {
      .section-py {
        padding: 56px 0;
      }
    }
    .section-header {
      margin-bottom: 48px;
    }
    .section-header.text-center {
      text-align: center;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }
    .tag-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      font-size: 0.8125rem;
      font-weight: 600;
      color: var(--primary);
      background-color: rgba(16, 185, 129, 0.12);
      border: 1px solid rgba(16, 185, 129, 0.25);
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
      text-transform: uppercase;
    }
    .tag-badge-dark {
      color: var(--accent);
      background-color: rgba(16, 185, 129, 0.15);
      border-color: rgba(16, 185, 129, 0.3);
    }
    .h1-title {
      font-size: 2.75rem;
      line-height: 1.25;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 24px;
    }
    .h2-title {
      font-size: 2.125rem;
      line-height: 1.3;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 18px;
    }
    .h2-title-dark {
      color: #FFFFFF;
    }
    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .section-desc-dark {
      color: var(--text-light);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 13px 28px;
      font-size: 0.9375rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      min-height: 48px;
    }
    .btn-primary {
      background-color: var(--accent);
      color: #030712;
      box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
    }
    .btn-primary:hover {
      background-color: #059669;
      color: #FFFFFF;
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(16, 185, 129, 0.45);
    }
    .btn-outline {
      background: transparent;
      border-color: rgba(255, 255, 255, 0.35);
      color: #FFFFFF;
    }
    .btn-outline:hover {
      background-color: rgba(255, 255, 255, 0.1);
      border-color: #FFFFFF;
    }
    .btn-secondary {
      background-color: #0F172A;
      color: #FFFFFF;
    }
    .btn-secondary:hover {
      background-color: #1E293B;
      transform: translateY(-2px);
    }

    /* 顶部通栏状态栏与主导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: #FFFFFF;
      box-shadow: 0 1px 0 var(--border-color);
      transition: background 0.3s ease;
    }
    .top-bar {
      background-color: #0B132B;
      color: var(--text-light);
      font-size: 0.8125rem;
      padding: 8px 0;
      border-bottom: 1px solid var(--border-dark);
    }
    .top-bar-flex {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .top-meta-group {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .status-dot {
      display: inline-block;
      width: 8px;
      height: 8px;
      background-color: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
    }
    .main-nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.01em;
    }
    .brand-logo-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, #0A5C36 0%, #10B981 100%);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFFFFF;
      font-size: 1.1rem;
      font-weight: 900;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 32px;
    }
    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 6px 0;
      position: relative;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 2px;
      background-color: var(--accent);
    }
    .nav-action {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-main);
      padding: 6px;
    }

    /* 1. 首屏 Banner (#hero-banner) */
    .hero-section {
      position: relative;
      background-color: #030712;
      color: #FFFFFF;
      padding: 110px 0 130px;
      overflow: hidden;
    }
    .hero-bg-overlay {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: linear-gradient(180deg, rgba(3, 7, 18, 0.88) 0%, rgba(11, 19, 43, 0.95) 100%), url('/assets/images/850b60c163298f2b.webp') center/cover no-repeat;
      z-index: 1;
    }
    .hero-glow-layer {
      position: absolute;
      top: 20%;
      left: 30%;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(16, 185, 129, 0.15) 0%, rgba(3, 7, 18, 0) 70%);
      pointer-events: none;
      z-index: 2;
    }
    .hero-content {
      position: relative;
      z-index: 3;
      max-width: 920px;
      margin: 0 auto;
      text-align: center;
    }
    .hero-intro-text {
      font-size: 1.1875rem;
      color: var(--text-light);
      margin-bottom: 36px;
      line-height: 1.75;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-btn-group {
      display: flex;
      justify-content: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .hero-feature-tags {
      display: flex;
      justify-content: center;
      gap: 28px;
      flex-wrap: wrap;
      border-top: 1px solid rgba(255, 255, 255, 0.12);
      padding-top: 28px;
      font-size: 0.875rem;
      color: #CBD5E1;
    }
    .hero-feature-tags span {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    /* 2. 品牌与架构概览 (#brand-intro) */
    .brand-section {
      background-color: var(--bg-main);
    }
    .split-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 56px;
      align-items: center;
    }
    .spec-list {
      list-style: none;
      margin-top: 28px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .spec-item {
      display: flex;
      gap: 14px;
    }
    .spec-dot {
      width: 20px;
      height: 20px;
      border-radius: 4px;
      background: rgba(16, 185, 129, 0.18);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.75rem;
      font-weight: 700;
      flex-shrink: 0;
      margin-top: 3px;
    }
    .img-frame {
      position: relative;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      background-color: #FFFFFF;
    }

    /* 3. 核心优势六宫格 (#core-features) */
    .features-section {
      background-color: var(--bg-alt);
    }
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: #FFFFFF;
      padding: 36px 30px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(16, 185, 129, 0.5);
    }
    .card-metric-badge {
      align-self: flex-start;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: 4px;
      background-color: #F8FAFC;
      color: var(--accent-blue);
      border: 1px solid #E2E8F0;
      margin-bottom: 18px;
    }
    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .card-text {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.68;
    }

    /* 4. 热门产品解决方案 (#hot-products) */
    .products-section {
      background-color: var(--bg-main);
    }
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-box {
      background-color: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: all 0.3s ease;
    }
    .product-box:hover {
      box-shadow: var(--shadow-lg);
      border-color: var(--primary);
    }
    .product-box-body {
      padding: 30px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .product-spec-row {
      display: flex;
      justify-content: space-between;
      padding: 10px 0;
      border-bottom: 1px dashed var(--border-color);
      font-size: 0.875rem;
    }
    .spec-key {
      color: var(--text-muted);
    }
    .spec-val {
      font-weight: 600;
      color: var(--text-main);
    }
    .product-box-footer {
      padding: 20px 30px;
      background-color: #F8FAFC;
      border-top: 1px solid var(--border-color);
    }

    /* 5. 深色沉浸式 AI 模型与技术理念 (#tech-concept) */
    .dark-concept-section {
      background-color: var(--bg-dark);
      color: #FFFFFF;
    }
    .concept-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      margin-top: 40px;
    }
    .concept-card {
      background-color: var(--bg-dark-card);
      border: 1px solid var(--border-dark);
      padding: 32px;
      border-radius: var(--radius-md);
      transition: all 0.3s ease;
    }
    .concept-card:hover {
      border-color: var(--accent);
      box-shadow: 0 0 20px rgba(16, 185, 129, 0.15);
    }
    .concept-card h3 {
      font-size: 1.25rem;
      color: #FFFFFF;
      margin-bottom: 14px;
    }
    .concept-card p {
      color: var(--text-light);
      font-size: 0.9375rem;
      line-height: 1.65;
    }

    /* 6. 场景业务全链路时间线 (#user-stories) */
    .timeline-section {
      background-color: var(--bg-alt);
    }
    .timeline-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .step-card {
      background-color: #FFFFFF;
      padding: 28px 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }
    .step-number {
      width: 36px;
      height: 36px;
      background-color: var(--primary);
      color: #FFFFFF;
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
    }
    .step-card h3 {
      font-size: 1.125rem;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .step-card p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 7. 关键数据统计指标 (#data-metrics) */
    .metrics-bar-section {
      background-color: #0B132B;
      color: #FFFFFF;
      padding: 56px 0;
      border-top: 1px solid var(--border-dark);
      border-bottom: 1px solid var(--border-dark);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .metric-num {
      font-size: 2.75rem;
      font-weight: 800;
      color: var(--accent);
      font-variant-numeric: tabular-nums;
      margin-bottom: 6px;
    }
    .metric-label {
      font-size: 1rem;
      font-weight: 600;
      color: #FFFFFF;
      margin-bottom: 4px;
    }
    .metric-sub {
      font-size: 0.8125rem;
      color: var(--text-light);
    }

    /* 8. 客户评价与实测证明 (#social-proof) */
    .proof-section {
      background-color: var(--bg-main);
    }
    .proof-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .proof-card {
      background-color: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .proof-quote {
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
      font-style: italic;
    }
    .proof-author {
      display: flex;
      align-items: center;
      gap: 14px;
      border-top: 1px solid var(--border-color);
      padding-top: 18px;
    }
    .proof-avatar-init {
      width: 44px;
      height: 44px;
      background: var(--bg-alt);
      border-radius: 50%;
      color: var(--primary);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--border-color);
    }
    .author-name {
      font-weight: 700;
      font-size: 0.9375rem;
      color: var(--text-main);
    }
    .author-title {
      font-size: 0.8125rem;
      color: var(--text-muted);
    }

    /* 9. 服务方案与套餐价格 (#pricing-plans) */
    .pricing-section {
      background-color: var(--bg-alt);
    }
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      align-items: stretch;
    }
    .pricing-card {
      background-color: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 40px 32px;
      display: flex;
      flex-direction: column;
      position: relative;
    }
    .pricing-card.featured {
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-lg);
      transform: scale(1.02);
    }
    .featured-badge {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary);
      color: #FFFFFF;
      padding: 4px 16px;
      font-size: 0.75rem;
      font-weight: 700;
      border-radius: 20px;
    }
    .pricing-title {
      font-size: 1.35rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .pricing-desc {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-bottom: 24px;
    }
    .pricing-price {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 24px;
    }
    .pricing-price small {
      font-size: 0.875rem;
      font-weight: 400;
      color: var(--text-muted);
    }
    .pricing-list {
      list-style: none;
      margin-bottom: 32px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .pricing-list li {
      font-size: 0.875rem;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .check-icon {
      color: var(--accent);
      font-weight: 900;
    }

    /* 10. AI 安全动态与情报洞察 (#news-insights) */
    .news-section {
      background-color: var(--bg-main);
    }
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      background-color: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
    }
    .news-img-wrap {
      height: 200px;
      overflow: hidden;
    }
    .news-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .news-card:hover .news-img-wrap img {
      transform: scale(1.05);
    }
    .news-content {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .news-meta {
      display: flex;
      justify-content: space-between;
      font-size: 0.8125rem;
      color: var(--text-light);
      margin-bottom: 12px;
    }
    .threat-tag {
      color: #DC2626;
      font-weight: 600;
    }
    .news-title {
      font-size: 1.125rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
      line-height: 1.45;
    }
    .news-text {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 18px;
    }

    /* 11. FAQ 手风琴 (#faq-section) */
    .faq-section {
      background-color: var(--bg-alt);
    }
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap:24px;
      align-items: start;
    }
    .faq-item {
      background-color: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      margin-bottom: 16px;
      box-shadow: var(--shadow-sm);
    }
    .faq-summary {
      padding: 20px 24px;
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      list-style: none;
    }
    .faq-summary::-webkit-details-marker {
      display: none;
    }
    .faq-icon {
      font-size: 1.25rem;
      color: var(--primary);
      transition: transform 0.25s ease;
    }
    details[open] .faq-icon {
      transform: rotate(45deg);
    }
    .faq-content {
      padding: 0 24px 22px 24px;
      font-size: 0.9375rem;
      color: var(--text-muted);
      line-height: 1.7;
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
    }

    /* 12. 全站闭环决策转化区 (#bottom-cta) */
    .cta-section {
      background: radial-gradient(circle at 50% 20%, #0F231B 0%, #030712 100%);
      color: #FFFFFF;
      text-align: center;
      padding: 100px 0;
      border-top: 1px solid var(--border-dark);
    }
    .cta-box {
      max-width: 820px;
      margin: 0 auto;
    }
    .cta-form-wrap {
      display: flex;
      justify-content: center;
      gap: 12px;
      max-width: 580px;
      margin: 36px auto 20px;
      flex-wrap: wrap;
    }
    .cta-input {
      flex: 1;
      min-width: 260px;
      padding: 14px 18px;
      background: #0B132B;
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-sm);
      color: #FFFFFF;
      font-size: 0.9375rem;
    }
    .cta-input:focus {
      outline: none;
      border-color: var(--accent);
    }
    .cta-tips {
      font-size: 0.8125rem;
      color: var(--text-light);
    }

    /* 页脚系统 */
    .site-footer {
      background-color: #030712;
      color: var(--text-light);
      padding: 80px 0 32px;
      border-top: 1px solid var(--border-dark);
      font-size: 0.875rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 48px;
      margin-bottom: 56px;
    }
    .footer-brand h4 {
      color: #FFFFFF;
      font-size: 1.25rem;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .footer-desc {
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .footer-col h5 {
      color: #FFFFFF;
      font-size: 1rem;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: var(--accent);
    }
    .footer-contact-item {
      margin-bottom: 12px;
      display: flex;
      flex-direction: column;
      gap: 4px;
    }
    .footer-contact-item span {
      color: #FFFFFF;
    }
    .footer-bottom {
      border-top: 1px solid var(--border-dark);
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.8125rem;
    }

    /* 响应式断点控制 */
    @media (max-width: 1024px) {
      .split-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .features-grid,
      .products-grid,
      .concept-grid,
      .proof-grid,
      .pricing-grid,
      .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .timeline-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .pricing-card.featured {
        transform: none;
      }
    }
    @media (max-width: 768px) {
      .top-bar-flex {
        justify-content: center;
        text-align: center;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 24px;
        box-shadow: var(--shadow-lg);
        border-bottom: 1px solid var(--border-color);
        gap: 16px;
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .h1-title {
        font-size: 2rem;
      }
      .h2-title {
        font-size: 1.625rem;
      }
      .features-grid,
      .products-grid,
      .concept-grid,
      .proof-grid,
      .pricing-grid,
      .news-grid,
      .faq-grid,
      .timeline-steps,
      .metrics-grid,
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .nav-action .btn {
        padding: 8px 16px;
        font-size: 0.8125rem;
      }
    }