/* roulang page: index */
:root {
      --primary-blue: #0F52BA;
      --accent-blue: #1E88E5;
      --hover-blue: #0b3d8f;
      --bg-light: #FAFCFF;
      --bg-white: #FFFFFF;
      --bg-dark: #0A192F;
      --bg-soft-blue: #F0F6FF;
      --border-color: #E2E8F0;
      --text-main: #0A1931;
      --text-body: #374151;
      --text-muted: #6B7280;
      --text-white: #F9FAFB;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --shadow-sm: 0 2px 6px -1px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 6px 20px -2px rgba(15, 82, 186, 0.06), 0 2px 6px -1px rgba(0, 0, 0, 0.02);
      --shadow-hover: 0 12px 28px -4px rgba(15, 82, 186, 0.14), 0 4px 10px -2px rgba(0, 0, 0, 0.04);
      --transition-base: all 0.25s ease;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition-base);
    }

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

    button, input, select, textarea {
      font-family: inherit;
      outline: none;
    }

    .container {
      width: 100%;
      max-width: 1260px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Section Global Styles */
    section {
      padding: 92px 0;
      position: relative;
    }

    .section-alt {
      background-color: #F4F8FD;
      border-top: 1px solid #EAF0FA;
      border-bottom: 1px solid #EAF0FA;
    }

    .section-header {
      margin-bottom: 56px;
      text-align: left;
    }

    .section-header.center {
      text-align: center;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
      margin-bottom: 60px;
    }

    .badge-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background: rgba(30, 136, 229, 0.1);
      color: var(--primary-blue);
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 14px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Top Bar & Navigation */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(10, 25, 49, 0.05);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }

    .header-topbar {
      background: var(--bg-dark);
      color: #94A3B8;
      font-size: 12px;
      padding: 7px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .header-topbar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .topbar-contact {
      display: flex;
      gap: 20px;
    }

    .topbar-contact a {
      color: #CBD5E1;
    }
    .topbar-contact a:hover {
      color: #FFFFFF;
    }

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

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

    .logo-symbol {
      width: 42px;
      height: 42px;
      background: linear-gradient(135deg, var(--primary-blue), var(--accent-blue));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 800;
      font-size: 20px;
      box-shadow: 0 4px 10px rgba(15, 82, 186, 0.25);
    }

    .logo-text-group {
      display: flex;
      flex-direction: column;
    }

    .logo-title {
      font-size: 18px;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.3px;
      line-height: 1.2;
    }

    .logo-subtitle {
      font-size: 11px;
      color: var(--text-muted);
      letter-spacing: 0.5px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 30px;
    }

    .nav-item a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 6px 0;
    }

    .nav-item a:hover,
    .nav-item a.active {
      color: var(--primary-blue);
    }

    .nav-item a.active::after,
    .nav-item a:hover::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary-blue);
      border-radius: 2px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 11px 22px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition-base);
    }

    .btn-primary {
      background-color: var(--primary-blue);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(15, 82, 186, 0.25);
    }

    .btn-primary:hover {
      background-color: var(--hover-blue);
      box-shadow: 0 6px 18px rgba(15, 82, 186, 0.35);
      transform: translateY(-2px);
    }

    .btn-secondary {
      background: #FFFFFF;
      color: var(--primary-blue);
      border-color: #BFDBFE;
    }

    .btn-secondary:hover {
      background: #EFF6FF;
      border-color: var(--primary-blue);
    }

    .btn-light {
      background: rgba(255, 255, 255, 0.15);
      color: #FFFFFF;
      border-color: rgba(255, 255, 255, 0.3);
      backdrop-filter: blur(4px);
    }

    .btn-light:hover {
      background: #FFFFFF;
      color: var(--bg-dark);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 1. Hero Section (左文右图 5:7 斜向错位) */
    .hero-section {
      background: radial-gradient(circle at 10% 20%, rgba(30, 136, 229, 0.06) 0%, rgba(250, 252, 255, 1) 60%), url('/assets/images/64fa4aaa304c86c4.png') no-repeat right bottom / contain;
      padding: 70px 0 90px;
      overflow: hidden;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      align-items: center;
    }

    .hero-content {
      z-index: 2;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #EBF3FF;
      border: 1px solid #C7DCFE;
      padding: 6px 14px;
      border-radius: 30px;
      color: var(--primary-blue);
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .hero-tag span {
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10B981;
      animation: pulse 1.8s infinite;
    }

    @keyframes pulse {
      0% { opacity: 0.6; transform: scale(0.9); }
      50% { opacity: 1; transform: scale(1.15); }
      100% { opacity: 0.6; transform: scale(0.9); }
    }

    .hero-title {
      font-size: 38px;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 18px;
    }

    .hero-description {
      font-size: 16px;
      color: var(--text-body);
      line-height: 1.75;
      margin-bottom: 30px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 38px;
      flex-wrap: wrap;
    }

    .hero-kpis {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      padding-top: 24px;
      border-top: 1px solid var(--border-color);
    }

    .kpi-item h4 {
      font-size: 26px;
      font-weight: 800;
      color: var(--primary-blue);
      line-height: 1;
      margin-bottom: 6px;
    }

    .kpi-item p {
      font-size: 12px;
      color: var(--text-muted);
    }

    .hero-visual {
      position: relative;
    }

    .hero-img-card {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 20px 40px -10px rgba(15, 82, 186, 0.2);
      border: 4px solid #FFFFFF;
      transform: perspective(1000px) rotateY(-5deg) rotateX(2deg);
      transition: var(--transition-base);
    }

    .hero-img-card:hover {
      transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
    }

    .hero-img-card img {
      width: 100%;
      height: 480px;
      object-fit: cover;
    }

    .floating-metric-badge {
      position: absolute;
      bottom: 24px;
      left: -20px;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      padding: 16px 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-hover);
      border: 1px solid #DCE7F6;
      display: flex;
      align-items: center;
      gap: 14px;
      z-index: 3;
    }

    .badge-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: #E1EFFE;
      color: var(--primary-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
    }

    /* 2. 板块二：业务全景架构介绍 (Overview) */
    .overview-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .overview-schematic {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 32px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

    .layer-card {
      background: #F8FAFC;
      border: 1px dashed #CBD5E1;
      border-radius: 8px;
      padding: 14px 18px;
      margin-bottom: 12px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .layer-card:last-child {
      margin-bottom: 0;
    }

    .layer-card.highlight {
      background: #EFF6FF;
      border-color: #93C5FD;
      border-style: solid;
    }

    .layer-title {
      font-weight: 700;
      font-size: 14px;
      color: var(--text-main);
    }

    .layer-desc {
      font-size: 12px;
      color: var(--text-muted);
    }

    .compliance-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-top: 24px;
      background: #ECFDF5;
      border: 1px solid #A7F3D0;
      color: #065F46;
      padding: 10px 16px;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 600;
    }

    /* 3. 板块三：核心优势矩阵 (Grid 6 Cards) */
    .strength-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .strength-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
      display: flex;
      flex-direction: column;
    }

    .strength-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: #BFDBFE;
    }

    .strength-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: #EFF6FF;
      color: var(--primary-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .strength-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .strength-text {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.65;
    }

    /* 4. 板块四：热门服务产品矩阵 (Product Matrix - 3 Cards) */
    .product-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .product-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      display: flex;
      flex-direction: column;
      transition: var(--transition-base);
    }

    .product-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .product-card-thumb {
      height: 200px;
      overflow: hidden;
      position: relative;
    }

    .product-card-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .product-card:hover .product-card-thumb img {
      transform: scale(1.05);
    }

    .product-badge {
      position: absolute;
      top: 14px;
      right: 14px;
      background: rgba(15, 82, 186, 0.9);
      color: #fff;
      font-size: 11px;
      padding: 4px 10px;
      border-radius: 4px;
      font-weight: 600;
    }

    .product-card-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .product-card-title {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .product-card-text {
      font-size: 14px;
      color: var(--text-body);
      margin-bottom: 18px;
      flex: 1;
    }

    .product-spec-list {
      list-style: none;
      border-top: 1px solid #F1F5F9;
      padding-top: 14px;
      margin-bottom: 18px;
    }

    .product-spec-list li {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .product-spec-list li::before {
      content: '✔';
      color: var(--primary-blue);
      font-weight: bold;
      font-size: 12px;
    }

    /* 5. 板块五：数据驱动对比看板 (Split Comparison Table) */
    .compare-container {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow: hidden;
    }

    .compare-header-row {
      display: grid;
      grid-template-columns: 2fr 3fr 3fr;
      background: #F8FAFC;
      border-bottom: 2px solid #E2E8F0;
      font-weight: 700;
      font-size: 15px;
      color: var(--text-main);
    }

    .compare-cell {
      padding: 18px 22px;
      display: flex;
      align-items: center;
    }

    .compare-row {
      display: grid;
      grid-template-columns: 2fr 3fr 3fr;
      border-bottom: 1px solid #EDF2F7;
      font-size: 14px;
    }

    .compare-row:last-child {
      border-bottom: none;
    }

    .compare-label {
      font-weight: 600;
      color: var(--text-main);
      background: #FBFDFF;
    }

    .compare-old {
      color: #94A3B8;
      background: #FFFDFC;
    }

    .compare-new {
      background: #F0F7FF;
      color: var(--primary-blue);
      font-weight: 600;
    }

    /* 6. 板块六：深色沉浸式案例与核心理念区 (Dark Theme Showcase) */
    .dark-showcase-section {
      background: var(--bg-dark);
      color: var(--text-white);
      padding: 100px 0;
      background-image: radial-gradient(circle at 80% 20%, rgba(30, 136, 229, 0.15) 0%, transparent 60%);
    }

    .dark-showcase-section .section-title {
      color: #FFFFFF;
    }

    .dark-showcase-section .section-desc {
      color: #94A3B8;
    }

    .dark-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }

    .topology-container {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      padding: 30px;
      position: relative;
    }

    .topology-node {
      background: rgba(15, 82, 186, 0.35);
      border: 1px solid rgba(147, 197, 253, 0.4);
      padding: 16px 20px;
      border-radius: 8px;
      margin-bottom: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .topology-node:last-child {
      margin-bottom: 0;
    }

    .node-title {
      font-weight: 700;
      font-size: 15px;
      color: #FFFFFF;
    }

    .node-stat {
      color: #38BDF8;
      font-size: 13px;
      font-weight: 600;
    }

    .dark-feature-list {
      list-style: none;
      margin-top: 24px;
    }

    .dark-feature-item {
      display: flex;
      gap: 16px;
      margin-bottom: 24px;
    }

    .dark-feature-icon {
      width: 36px;
      height: 36px;
      border-radius: 6px;
      background: rgba(30, 136, 229, 0.2);
      color: #60A5FA;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      font-weight: 700;
    }

    /* 7. 板块七：典型用户故事与业务实录 (User Stories) */
    .story-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .story-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
    }

    .story-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .story-thumb {
      height: 180px;
      overflow: hidden;
    }

    .story-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .story-body {
      padding: 24px;
    }

    .story-role {
      font-size: 12px;
      color: var(--primary-blue);
      font-weight: 700;
      text-transform: uppercase;
      margin-bottom: 6px;
    }

    .story-headline {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .story-text {
      font-size: 13px;
      color: var(--text-body);
      line-height: 1.6;
    }

    /* 8. 板块八：关键数据性能统计条 (Metric Milestone Strip) */
    .metric-strip-section {
      background: linear-gradient(135deg, #0F52BA 0%, #1565C0 100%);
      color: #FFFFFF;
      padding: 60px 0;
    }

    .metric-strip-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .strip-item h3 {
      font-size: 40px;
      font-weight: 900;
      color: #FFFFFF;
      letter-spacing: -0.5px;
      margin-bottom: 8px;
    }

    .strip-item p {
      font-size: 14px;
      color: #BFDBFE;
    }

    /* 9. 板块九：企业技术发展里程碑 (Timeline) */
    .timeline-container {
      position: relative;
      max-width: 920px;
      margin: 0 auto;
      padding: 20px 0;
    }

    .timeline-container::before {
      content: '';
      position: absolute;
      top: 0;
      bottom: 0;
      left: 50%;
      width: 2px;
      background: #DCE7F6;
      transform: translateX(-50%);
    }

    .timeline-item {
      position: relative;
      margin-bottom: 40px;
      width: 50%;
    }

    .timeline-item:last-child {
      margin-bottom: 0;
    }

    .timeline-item.left {
      left: 0;
      padding-right: 48px;
      text-align: right;
    }

    .timeline-item.right {
      left: 50%;
      padding-left: 48px;
      text-align: left;
    }

    .timeline-dot {
      position: absolute;
      top: 18px;
      width: 16px;
      height: 16px;
      border-radius: 50%;
      background: #FFFFFF;
      border: 4px solid var(--primary-blue);
      z-index: 2;
    }

    .timeline-item.left .timeline-dot {
      right: -8px;
    }

    .timeline-item.right .timeline-dot {
      left: -8px;
    }

    .timeline-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px 26px;
      box-shadow: var(--shadow-sm);
      display: inline-block;
      text-align: left;
    }

    .timeline-year {
      font-size: 13px;
      font-weight: 700;
      color: var(--primary-blue);
      margin-bottom: 6px;
      display: inline-block;
      background: #EFF6FF;
      padding: 3px 10px;
      border-radius: 4px;
    }

    .timeline-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .timeline-desc {
      font-size: 13px;
      color: var(--text-body);
      line-height: 1.6;
    }

    /* 10. 板块十：行业客户与机构评价区 (Testimonials) */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .testimonial-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
    }

    .testimonial-quote {
      font-size: 14px;
      color: var(--text-body);
      line-height: 1.7;
      margin-bottom: 24px;
      position: relative;
      z-index: 1;
    }

    .testimonial-quote::before {
      content: '“';
      font-size: 56px;
      font-family: Georgia, serif;
      color: #E2E8F0;
      position: absolute;
      top: -24px;
      left: -12px;
      z-index: -1;
      line-height: 1;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 14px;
      border-top: 1px solid #F1F5F9;
      padding-top: 18px;
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #1E88E5, #0F52BA);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
      flex-shrink: 0;
    }

    .author-meta h5 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.2;
    }

    .author-meta p {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 11. 板块十一：资讯与前沿动态 (News & Insights) */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .news-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: var(--transition-base);
    }

    .news-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .news-thumb {
      height: 180px;
      overflow: hidden;
    }

    .news-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .news-content {
      padding: 22px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .news-meta {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 12px;
      font-size: 12px;
      color: var(--text-muted);
    }

    .news-category {
      color: var(--primary-blue);
      font-weight: 600;
      background: #EFF6FF;
      padding: 2px 8px;
      border-radius: 4px;
    }

    .news-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.4;
      margin-bottom: 10px;
    }

    .news-brief {
      font-size: 13px;
      color: var(--text-body);
      line-height: 1.6;
      flex: 1;
      margin-bottom: 16px;
    }

    .news-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--primary-blue);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 12. 板块十二：平台安全合规与运行保障体系 (Platform Security) */
    .security-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .security-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px 22px;
      box-shadow: var(--shadow-sm);
      text-align: left;
    }

    .security-icon {
      width: 44px;
      height: 44px;
      border-radius: 8px;
      background: #F0FDF4;
      color: #16A34A;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 800;
      margin-bottom: 16px;
    }

    .security-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .security-desc {
      font-size: 13px;
      color: var(--text-body);
      line-height: 1.6;
    }

    /* 13. 板块十三：高频热点解答手风琴 (FAQ Accordion) */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition-base);
    }

    .faq-header {
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      font-size: 16px;
      color: var(--text-main);
      user-select: none;
    }

    .faq-icon {
      font-size: 18px;
      color: var(--primary-blue);
      transition: transform 0.25s ease;
    }

    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #FBFDFF;
      color: var(--text-body);
      font-size: 14px;
      line-height: 1.7;
      padding: 0 24px;
      border-top: 1px solid transparent;
    }

    .faq-item.active {
      border-color: #BFDBFE;
    }

    .faq-item.active .faq-header {
      color: var(--primary-blue);
    }

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

    .faq-item.active .faq-body {
      max-height: 240px;
      padding: 16px 24px 20px;
      border-top-color: #F1F5F9;
    }

    /* 14. 板块十四：转化行动呼吁与快速咨询表单 (Conversion CTA & Form) */
    .conversion-card {
      background: linear-gradient(135deg, #0A192F 0%, #0F52BA 100%);
      border-radius: var(--radius-lg);
      padding: 56px 48px;
      color: #FFFFFF;
      box-shadow: 0 16px 36px rgba(10, 25, 49, 0.25);
    }

    .conversion-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }

    .conversion-intro h2 {
      font-size: 32px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 18px;
      color: #FFFFFF;
    }

    .conversion-intro p {
      font-size: 15px;
      color: #CBD5E1;
      line-height: 1.75;
      margin-bottom: 28px;
    }

    .conversion-guarantees {
      list-style: none;
    }

    .conversion-guarantees li {
      font-size: 14px;
      color: #E2E8F0;
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .conversion-form {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 32px;
      color: var(--text-body);
      box-shadow: var(--shadow-md);
    }

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

    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      background: #F8FAFC;
      transition: var(--transition-base);
    }

    .form-control:focus {
      background: #FFFFFF;
      border-color: var(--primary-blue);
      box-shadow: 0 0 0 3px rgba(15, 82, 186, 0.15);
    }

    .form-privacy {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 20px;
      display: flex;
      align-items: flex-start;
      gap: 8px;
    }

    .form-privacy input {
      margin-top: 3px;
    }

    /* Footer */
    .site-footer {
      background: #060E1A;
      color: #94A3B8;
      padding: 72px 0 24px;
      border-top: 1px solid #1E293B;
      font-size: 14px;
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 48px;
    }

    .footer-brand h4 {
      color: #FFFFFF;
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .footer-brand p {
      line-height: 1.7;
      font-size: 13px;
      margin-bottom: 20px;
      color: #64748B;
    }

    .footer-col h5 {
      color: #FFFFFF;
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 18px;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links a {
      color: #94A3B8;
      font-size: 13px;
    }

    .footer-links a:hover {
      color: #FFFFFF;
    }

    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
      color: #64748B;
      flex-wrap: wrap;
      gap: 14px;
    }

    /* Responsive Breakpoints */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .hero-img-card img {
        height: 380px;
      }
      .strength-grid,
      .product-grid,
      .story-grid,
      .news-grid,
      .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .security-grid,
      .metric-strip-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .dark-grid,
      .conversion-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      section {
        padding: 56px 0;
      }
      .nav-menu {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 28px;
      }
      .section-title {
        font-size: 24px;
      }
      .strength-grid,
      .product-grid,
      .story-grid,
      .news-grid,
      .testimonial-grid,
      .security-grid,
      .metric-strip-grid {
        grid-template-columns: 1fr;
      }
      .overview-grid {
        grid-template-columns: 1fr;
      }
      .timeline-container::before {
        left: 20px;
      }
      .timeline-item {
        width: 100%;
        left: 0 !important;
        padding-left: 48px !important;
        padding-right: 0 !important;
        text-align: left !important;
      }
      .timeline-item .timeline-dot {
        left: 12px !important;
      }
      .compare-header-row,
      .compare-row {
        grid-template-columns: 1fr;
      }
      .compare-cell {
        padding: 12px 16px;
      }
      .floating-metric-badge {
        position: static;
        margin-top: 14px;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
      .conversion-card {
        padding: 32px 20px;
      }
      .header-topbar {
        display: none;
      }
    }