/* roulang page: index */
:root {
      --primary-gradient: linear-gradient(135deg, #4F46E5 0%, #06B6D4 100%);
      --primary-purple: #4F46E5;
      --aurora-cyan: #06B6D4;
      --neon-green: #10B981;
      --bg-light-start: #F8FAFC;
      --bg-light-end: #F1F5F9;
      --bg-dark-obsidian: #0B0F19;
      --bg-dark-card: #111827;
      --text-heading: #0F172A;
      --text-body: #475569;
      --text-muted: #64748B;
      --text-light: #FFFFFF;
      --text-light-dim: #94A3B8;
      --card-radius: 1.35rem;
      --card-radius-sm: 0.85rem;
      --shadow-soft: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
      --shadow-hover: 0 20px 30px -10px rgba(79, 70, 229, 0.12), 0 10px 15px -5px rgba(6, 182, 212, 0.08);
      --border-light: rgba(226, 232, 240, 0.8);
      --border-dark: rgba(255, 255, 255, 0.08);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light-start);
      color: var(--text-body);
    }

    body {
      overflow-x: hidden;
      line-height: 1.6;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }

    /* 顶部导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      background: rgba(255, 255, 255, 0.88);
      border-bottom: 1px solid var(--border-light);
    }

    .top-status-bar {
      background: #0f172a;
      color: #94a3b8;
      font-size: 0.75rem;
      padding: 0.35rem 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .top-status-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .status-indicator {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background-color: var(--neon-green);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--neon-green);
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(0.85); }
    }

    .main-nav {
      height: 4.5rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .brand-logo {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-heading);
      display: flex;
      align-items: center;
      gap: 0.5rem;
      letter-spacing: -0.02em;
    }
    .brand-logo-badge {
      background: var(--primary-gradient);
      color: #fff;
      font-size: 0.7rem;
      padding: 0.2rem 0.5rem;
      border-radius: 0.375rem;
      font-weight: 700;
      text-transform: uppercase;
    }
    .nav-links {
      display: flex;
      gap: 1.75rem;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-heading);
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary-purple);
    }
    .btn-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--primary-gradient);
      color: #ffffff !important;
      font-weight: 600;
      font-size: 0.95rem;
      padding: 0.7rem 1.4rem;
      border-radius: 9999px;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
      transition: all 0.25s ease;
      border: none;
      cursor: pointer;
    }
    .btn-cta:hover {
      opacity: 0.92;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
    }
    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: #ffffff;
      color: var(--text-heading);
      border: 1px solid var(--border-light);
      font-weight: 600;
      font-size: 0.95rem;
      padding: 0.7rem 1.4rem;
      border-radius: 9999px;
      transition: all 0.25s;
    }
    .btn-secondary:hover {
      border-color: var(--aurora-cyan);
      color: var(--primary-purple);
      background: #f8fafc;
    }

    /* 移动端菜单按钮 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-heading);
    }

    /* 通用板块规范 */
    .section-spacing {
      padding: 5.5rem 0;
    }
    .section-header {
      margin-bottom: 3.5rem;
      max-width: 820px;
    }
    .section-header.text-center {
      margin-left: auto;
      margin-right: auto;
      text-align: center;
    }
    .section-tag {
      display: inline-flex;
      align-items: center;
      gap: 0.35rem;
      padding: 0.3rem 0.85rem;
      border-radius: 9999px;
      font-size: 0.8rem;
      font-weight: 700;
      background: rgba(79, 70, 229, 0.08);
      color: var(--primary-purple);
      margin-bottom: 0.85rem;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--text-heading);
      line-height: 1.25;
      margin-bottom: 1rem;
      letter-spacing: -0.02em;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-body);
      line-height: 1.7;
    }

    /* 徽章 Badge */
    .data-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 0.25rem 0.75rem;
      border-radius: 9999px;
      font-size: 0.75rem;
      font-weight: 600;
      background: rgba(6, 182, 212, 0.1);
      color: #0891B2;
    }
    .data-badge.badge-green {
      background: rgba(16, 185, 129, 0.1);
      color: var(--neon-green);
    }

    /* #hero 首屏 */
    .hero-section {
      padding-top: 8.5rem;
      padding-bottom: 4.5rem;
      position: relative;
      background: radial-gradient(circle at top right, rgba(6, 182, 212, 0.08), transparent 45%),
                  radial-gradient(circle at bottom left, rgba(79, 70, 229, 0.05), transparent 50%),
                  linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-h1 {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.2;
      color: var(--text-heading);
      margin-bottom: 1.25rem;
      letter-spacing: -0.03em;
    }
    .hero-h1 span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.1rem;
      color: var(--text-body);
      margin-bottom: 2rem;
      line-height: 1.8;
    }
    .hero-actions {
      display: flex;
      gap: 1rem;
      align-items: center;
      margin-bottom: 2.25rem;
    }
    .hero-trust-bar {
      display: flex;
      gap: 2rem;
      padding-top: 1.5rem;
      border-top: 1px solid var(--border-light);
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .hero-trust-item {
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .trust-dot {
      color: var(--neon-green);
      font-weight: bold;
    }

    .hero-dashboard-card {
      background: var(--bg-dark-obsidian);
      border-radius: var(--card-radius);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 1.75rem;
      color: #fff;
      box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.25);
      position: relative;
      overflow: hidden;
    }
    .dash-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 1.5rem;
      padding-bottom: 1rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .dash-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1rem;
      margin-bottom: 1.5rem;
    }
    .dash-metric-box {
      background: rgba(255, 255, 255, 0.03);
      padding: 1rem;
      border-radius: var(--card-radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.05);
    }
    .dash-metric-label {
      font-size: 0.75rem;
      color: var(--text-light-dim);
      margin-bottom: 0.25rem;
    }
    .dash-metric-val {
      font-size: 1.6rem;
      font-weight: 800;
      color: #fff;
      font-family: monospace;
    }
    .dash-preview-image {
      border-radius: var(--card-radius-sm);
      overflow: hidden;
      position: relative;
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .dash-preview-image img {
      width: 100%;
      height: 180px;
      object-fit: cover;
    }
    .dash-live-badge {
      position: absolute;
      top: 0.75rem;
      left: 0.75rem;
      background: rgba(0, 0, 0, 0.7);
      backdrop-filter: blur(4px);
      padding: 0.25rem 0.6rem;
      border-radius: 4px;
      font-size: 0.7rem;
      color: #10B981;
      display: flex;
      align-items: center;
      gap: 5px;
    }

    /* #services 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2rem;
    }
    .service-card {
      background: #ffffff;
      border-radius: var(--card-radius);
      padding: 2.25rem;
      box-shadow: var(--shadow-soft);
      border: 1px solid var(--border-light);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: all 0.3s ease;
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      border-color: rgba(79, 70, 229, 0.3);
      transform: translateY(-4px);
    }
    .service-card-top {
      margin-bottom: 1.5rem;
    }
    .service-card-title {
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--text-heading);
      margin: 0.75rem 0;
    }
    .service-param-box {
      margin-top: 1.5rem;
      padding: 1rem;
      background: #f8fafc;
      border-radius: var(--card-radius-sm);
      border-left: 3px solid var(--aurora-cyan);
      font-size: 0.85rem;
      color: #334155;
    }

    /* #features 技术核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }
    .feature-card {
      background: #ffffff;
      border-radius: var(--card-radius);
      padding: 1.85rem;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-soft);
      transition: all 0.25s ease;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      border-color: rgba(6, 182, 212, 0.4);
    }
    .feature-card-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-heading);
      margin: 0.75rem 0 0.5rem 0;
    }
    .feature-card-desc {
      font-size: 0.9rem;
      color: var(--text-body);
      line-height: 1.6;
    }

    /* #products 商业产品线 */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .product-card {
      background: #ffffff;
      border-radius: var(--card-radius);
      border: 1px solid var(--border-light);
      overflow: hidden;
      box-shadow: var(--shadow-soft);
      display: flex;
      flex-direction: column;
      transition: transform 0.3s;
    }
    .product-card:hover {
      transform: translateY(-5px);
    }
    .product-img-box {
      height: 190px;
      overflow: hidden;
      position: relative;
    }
    .product-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s;
    }
    .product-card:hover .product-img-box img {
      transform: scale(1.05);
    }
    .product-body {
      padding: 1.75rem;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .product-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-heading);
      margin-bottom: 0.5rem;
    }
    .product-specs {
      list-style: none;
      margin: 1.25rem 0;
      font-size: 0.85rem;
      border-top: 1px solid #f1f5f9;
      padding-top: 1rem;
      flex: 1;
    }
    .product-specs li {
      display: flex;
      justify-content: space-between;
      padding: 0.35rem 0;
      color: #64748b;
    }
    .product-specs li strong {
      color: var(--text-heading);
    }

    /* #architecture 深色技术架构区 */
    .arch-section {
      background: var(--bg-dark-obsidian);
      color: #ffffff;
      padding: 6rem 0;
      position: relative;
    }
    .arch-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .arch-layer-item {
      background: var(--bg-dark-card);
      border: 1px solid var(--border-dark);
      border-radius: var(--card-radius-sm);
      padding: 1.25rem 1.5rem;
      margin-bottom: 1rem;
      position: relative;
      transition: border-color 0.3s;
    }
    .arch-layer-item:hover {
      border-color: var(--aurora-cyan);
    }
    .arch-layer-num {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--aurora-cyan);
      text-transform: uppercase;
      letter-spacing: 0.05em;
    }
    .arch-layer-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin: 0.25rem 0;
      color: #ffffff;
    }
    .arch-layer-desc {
      font-size: 0.85rem;
      color: var(--text-light-dim);
    }

    /* #usecases 行业应用 */
    .usecase-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3.5rem;
      align-items: center;
      margin-bottom: 4.5rem;
    }
    .usecase-row:last-child {
      margin-bottom: 0;
    }
    .usecase-row.reversed {
      direction: rtl;
    }
    .usecase-row.reversed .usecase-text {
      direction: ltr;
    }
    .usecase-img {
      border-radius: var(--card-radius);
      overflow: hidden;
      box-shadow: var(--shadow-soft);
      border: 1px solid var(--border-light);
    }
    .usecase-img img {
      width: 100%;
      height: 320px;
      object-fit: cover;
    }
    .usecase-title {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--text-heading);
      margin-bottom: 1rem;
    }
    .usecase-desc {
      font-size: 0.98rem;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 1.5rem;
    }
    .usecase-metric-pill {
      display: inline-block;
      padding: 0.5rem 1rem;
      background: #eef2ff;
      border-radius: var(--card-radius-sm);
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary-purple);
    }

    /* #milestones 里程碑数据条 */
    .milestone-bar {
      background: linear-gradient(90deg, #1e1b4b 0%, #0f172a 100%);
      border-radius: var(--card-radius);
      padding: 2.75rem 2rem;
      color: #ffffff;
      box-shadow: 0 15px 30px -10px rgba(30, 27, 75, 0.4);
    }
    .milestone-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
      text-align: center;
    }
    .milestone-val {
      font-size: 2.5rem;
      font-weight: 900;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 0.25rem;
    }
    .milestone-label {
      font-size: 0.85rem;
      color: var(--text-light-dim);
    }

    /* #comparison 对比表格 */
    .comparison-table-wrapper {
      background: #ffffff;
      border-radius: var(--card-radius);
      box-shadow: var(--shadow-soft);
      border: 1px solid var(--border-light);
      overflow-x: auto;
    }
    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .comp-table th, .comp-table td {
      padding: 1.25rem 1.75rem;
      border-bottom: 1px solid #f1f5f9;
    }
    .comp-table th {
      background: #f8fafc;
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-heading);
    }
    .comp-table td {
      font-size: 0.9rem;
      color: var(--text-body);
    }
    .comp-highlight {
      background: rgba(79, 70, 229, 0.02);
      font-weight: 600;
      color: var(--primary-purple);
    }

    /* #testimonials 评价卡片 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }
    .testimonial-card {
      background: #ffffff;
      border-radius: var(--card-radius);
      padding: 2rem;
      box-shadow: var(--shadow-soft);
      border: 1px solid var(--border-light);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-quote {
      font-size: 0.92rem;
      line-height: 1.7;
      color: #334155;
      margin-bottom: 1.5rem;
      font-style: italic;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }
    .author-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-heading);
    }
    .author-info p {
      font-size: 0.8rem;
      color: #64748b;
    }

    /* #news 资讯洞见 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.5rem;
    }
    .news-card {
      background: #ffffff;
      border-radius: var(--card-radius);
      border: 1px solid var(--border-light);
      overflow: hidden;
      box-shadow: var(--shadow-soft);
      display: flex;
      flex-direction: column;
    }
    .news-img {
      height: 160px;
    }
    .news-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .news-body {
      padding: 1.5rem;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .news-date {
      font-size: 0.75rem;
      color: #94a3b8;
      margin-bottom: 0.5rem;
    }
    .news-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-heading);
      margin-bottom: 0.6rem;
      line-height: 1.4;
    }
    .news-snippet {
      font-size: 0.85rem;
      color: var(--text-body);
      line-height: 1.6;
      flex: 1;
    }

    /* #security 平台安全 */
    .security-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
    }
    .security-card {
      background: #ffffff;
      border-radius: var(--card-radius);
      padding: 2.25rem;
      box-shadow: var(--shadow-soft);
      border: 1px solid var(--border-light);
    }
    .security-icon {
      font-size: 1.75rem;
      margin-bottom: 1rem;
    }

    /* #faq 手风琴 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #ffffff;
      border-radius: var(--card-radius-sm);
      border: 1px solid var(--border-light);
      margin-bottom: 1rem;
      overflow: hidden;
      transition: all 0.2s;
    }
    .faq-question {
      padding: 1.25rem 1.75rem;
      font-weight: 700;
      color: var(--text-heading);
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 1.75rem;
      color: var(--text-body);
      font-size: 0.92rem;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 250px;
      padding-bottom: 1.25rem;
    }
    .faq-arrow {
      transition: transform 0.3s ease;
      font-size: 0.8rem;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }

    /* #contact 转化接入 */
    .contact-card {
      background: linear-gradient(135deg, #0F172A 0%, #1E1B4B 100%);
      border-radius: var(--card-radius);
      padding: 3.5rem;
      color: #ffffff;
      box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.4);
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 3.5rem;
    }
    .form-group {
      margin-bottom: 1.25rem;
    }
    .form-group label {
      display: block;
      font-size: 0.85rem;
      margin-bottom: 0.4rem;
      color: var(--text-light-dim);
    }
    .form-control {
      width: 100%;
      padding: 0.85rem 1rem;
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--card-radius-sm);
      color: #ffffff;
      font-size: 0.9rem;
      transition: border-color 0.2s;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--aurora-cyan);
    }
    .form-control option {
      background: #0f172a;
      color: #fff;
    }

    /* 页脚 Footer */
    .site-footer {
      background: #0B0F19;
      color: #94A3B8;
      padding: 4.5rem 0 2rem 0;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      font-size: 0.88rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 3rem;
      margin-bottom: 3.5rem;
    }
    .footer-col h4 {
      color: #ffffff;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 1.25rem;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 0.6rem;
    }
    .footer-links a:hover {
      color: #ffffff;
    }
    .footer-bottom {
      padding-top: 2rem;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      text-align: center;
      font-size: 0.8rem;
      color: #64748B;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid, .arch-grid, .contact-card {
        grid-template-columns: 1fr;
        gap: 2.5rem;
      }
      .services-grid, .features-grid, .products-grid, .news-grid, .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links, .top-status-bar {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .services-grid, .features-grid, .products-grid, .news-grid, .testimonials-grid, .security-grid, .milestone-grid {
        grid-template-columns: 1fr;
      }
      .usecase-row, .usecase-row.reversed {
        grid-template-columns: 1fr;
        direction: ltr;
        gap: 1.5rem;
      }
      .hero-h1 {
        font-size: 2.25rem;
      }
      .hero-actions {
        flex-direction: column;
        align-items: stretch;
      }
      .contact-card {
        padding: 2rem 1.5rem;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .mobile-menu.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 4.5rem;
        left: 0;
        width: 100%;
        background: #ffffff;
        padding: 1.5rem;
        box-shadow: 0 10px 15px rgba(0,0,0,0.1);
        gap: 1rem;
      }
    }
    .mobile-menu {
      display: none;
    }