/* roulang page: index */
:root {
      --primary: #0F4C81;
      --primary-dark: #0A3258;
      --primary-light: #EBF3FA;
      --accent: #00A896;
      --accent-hover: #028073;
      --warning: #F4A261;
      --dark-bg: #0A192F;
      --dark-card: #112240;
      --slate-50: #F8FAFC;
      --slate-100: #F1F5F9;
      --slate-200: #E2E8F0;
      --slate-300: #CBD5E1;
      --slate-600: #475569;
      --slate-700: #334155;
      --slate-900: #0F172A;
      --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --radius-sm: 4px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 4px 6px -1px rgba(15, 76, 129, 0.08), 0 2px 4px -1px rgba(0,0,0,0.04);
      --shadow-lg: 0 12px 24px -8px rgba(15, 76, 129, 0.12);
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-base);
      color: var(--slate-700);
      background-color: var(--slate-50);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, select, textarea {
      font-family: inherit;
      font-size: inherit;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      padding: 0.75rem 1.6rem;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 4px 12px rgba(15, 76, 129, 0.25);
    }
    .btn-primary:hover {
      background-color: var(--primary-dark);
      box-shadow: 0 6px 16px rgba(15, 76, 129, 0.35);
      transform: translateY(-2px);
    }
    .btn-accent {
      background-color: var(--accent);
      color: #FFFFFF;
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      background-color: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }
    .btn-outline:hover {
      background-color: var(--primary-light);
    }
    .btn-white {
      background-color: #FFFFFF;
      color: var(--primary);
      font-weight: 700;
    }
    .btn-white:hover {
      background-color: var(--slate-100);
      transform: translateY(-2px);
    }
    .badge {
      display: inline-block;
      padding: 0.25rem 0.65rem;
      font-size: 0.75rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      letter-spacing: 0.05em;
      text-transform: uppercase;
    }
    .badge-primary {
      background: var(--primary-light);
      color: var(--primary);
      border: 1px solid rgba(15, 76, 129, 0.2);
    }
    .badge-accent {
      background: rgba(0, 168, 150, 0.1);
      color: var(--accent);
      border: 1px solid rgba(0, 168, 150, 0.25);
    }
    .badge-warning {
      background: rgba(244, 162, 97, 0.15);
      color: #C05621;
    }
    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 3.5rem;
    }
    .section-header h2 {
      font-size: 2.15rem;
      font-weight: 700;
      color: var(--slate-900);
      line-height: 1.35;
      margin-bottom: 1rem;
    }
    .section-header p {
      font-size: 1.05rem;
      color: var(--slate-600);
      line-height: 1.7;
    }
    .section-padding {
      padding: 5.5rem 0;
    }
    .bg-white { background-color: #FFFFFF; }
    .bg-slate { background-color: var(--slate-50); }
    .bg-dark { background-color: var(--dark-bg); color: #E2E8F0; }

    /* Top Bar */
    .top-bar {
      background-color: #0B192C;
      color: #94A3B8;
      font-size: 0.825rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding: 0.4rem 0;
    }
    .top-bar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-info {
      display: flex;
      gap: 1.5rem;
    }
    .top-bar-link:hover {
      color: #FFFFFF;
    }

    /* Main Nav */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
      border-bottom: 1px solid var(--slate-200);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.02em;
    }
    .brand-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFFFFF;
      font-weight: 900;
      font-size: 1.1rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 1.8rem;
      list-style: none;
    }
    .nav-link {
      font-size: 0.925rem;
      font-weight: 600;
      color: var(--slate-700);
      position: relative;
      padding: 0.5rem 0;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--accent);
      transition: width 0.2s ease;
    }
    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1rem;
    }

    /* Mobile toggle */
    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--slate-700);
    }

    /* Hero Section */
    .hero-section {
      position: relative;
      background: linear-gradient(rgba(10, 25, 47, 0.82), rgba(15, 76, 129, 0.88)), url('/assets/images/cf0cc8a6454d3d40.jpg') center/cover no-repeat;
      color: #FFFFFF;
      padding: 6.5rem 0 5.5rem;
      text-align: center;
    }
    .hero-content {
      max-width: 900px;
      margin: 0 auto;
    }
    .hero-title {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -0.02em;
      margin-bottom: 1.25rem;
      color: #FFFFFF;
    }
    .hero-subtitle {
      font-size: 1.15rem;
      color: #E2E8F0;
      margin-bottom: 2.5rem;
      line-height: 1.8;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }
    .search-bento-bar {
      background: #FFFFFF;
      padding: 0.5rem 0.6rem 0.5rem 1.25rem;
      border-radius: var(--radius-lg);
      box-shadow: 0 16px 36px rgba(0, 0, 0, 0.25);
      display: flex;
      align-items: center;
      max-width: 680px;
      margin: 0 auto 1.8rem;
    }
    .search-bento-bar input {
      border: none;
      outline: none;
      width: 100%;
      font-size: 0.95rem;
      color: var(--slate-900);
    }
    .hero-tags {
      display: flex;
      justify-content: center;
      align-items: center;
      flex-wrap: wrap;
      gap: 0.65rem;
      font-size: 0.875rem;
      color: #CBD5E1;
    }
    .hero-tag-item {
      background: rgba(255, 255, 255, 0.15);
      padding: 0.35rem 0.85rem;
      border-radius: 20px;
      color: #FFFFFF;
      border: 1px solid rgba(255, 255, 255, 0.25);
      transition: var(--transition);
    }
    .hero-tag-item:hover {
      background: var(--accent);
      border-color: var(--accent);
    }

    /* Section 2: Tech Specs */
    .tech-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .tech-media-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--slate-200);
      position: relative;
    }
    .tech-badge-overlay {
      position: absolute;
      bottom: 1.25rem;
      left: 1.25rem;
      background: rgba(15, 76, 129, 0.92);
      color: #FFFFFF;
      padding: 0.6rem 1rem;
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
      backdrop-filter: blur(4px);
    }
    .spec-item {
      display: flex;
      gap: 1rem;
      margin-bottom: 1.5rem;
    }
    .spec-num {
      width: 44px;
      height: 44px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      flex-shrink: 0;
    }

    /* Section 3: Advantages Matrix */
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.75rem;
    }
    .matrix-card {
      background: #FFFFFF;
      padding: 2rem;
      border-radius: var(--radius-md);
      border: 1px solid var(--slate-200);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .matrix-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: rgba(15, 76, 129, 0.35);
    }
    .matrix-card-icon {
      font-size: 1.85rem;
      margin-bottom: 1.25rem;
      color: var(--primary);
    }
    .matrix-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--slate-900);
      margin-bottom: 0.75rem;
    }
    .matrix-card p {
      font-size: 0.925rem;
      color: var(--slate-600);
      line-height: 1.65;
    }

    /* Section 4: Products Showcase */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .product-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--slate-200);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .product-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
    }
    .product-thumb {
      height: 220px;
      overflow: hidden;
      background-color: var(--slate-100);
    }
    .product-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .product-card:hover .product-thumb img {
      transform: scale(1.04);
    }
    .product-body {
      padding: 1.5rem;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .product-meta-list {
      list-style: none;
      margin: 1rem 0 1.5rem;
      padding-top: 1rem;
      border-top: 1px solid var(--slate-100);
      font-size: 0.85rem;
      color: var(--slate-600);
    }
    .product-meta-list li {
      display: flex;
      justify-content: space-between;
      margin-bottom: 0.5rem;
    }
    .product-meta-list span.val {
      font-weight: 600;
      color: var(--slate-900);
    }

    /* Section 5: Dark Innovation */
    .dark-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3.5rem;
      align-items: center;
    }
    .dark-card-panel {
      background: var(--dark-card);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      padding: 2.25rem;
    }
    .pipeline-step {
      display: flex;
      gap: 1.25rem;
      margin-bottom: 1.75rem;
    }
    .pipeline-dot {
      width: 14px;
      height: 14px;
      border-radius: 50%;
      background: var(--accent);
      margin-top: 6px;
      flex-shrink: 0;
      box-shadow: 0 0 10px var(--accent);
    }

    /* Section 6: Customer Stories */
    .story-card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .story-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--slate-200);
      padding: 1.75rem;
      box-shadow: var(--shadow-sm);
    }
    .story-phase {
      padding: 0.65rem 0.85rem;
      background: var(--slate-50);
      border-radius: var(--radius-sm);
      margin-bottom: 0.75rem;
      font-size: 0.875rem;
      line-height: 1.5;
    }
    .story-phase strong {
      color: var(--primary);
      display: block;
      margin-bottom: 0.25rem;
      font-size: 0.8rem;
      letter-spacing: 0.05em;
    }

    /* Section 7: Metric Counters */
    .counters-bar {
      background: linear-gradient(135deg, var(--primary-dark), #103358);
      color: #FFFFFF;
      padding: 4.5rem 0;
    }
    .counter-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .counter-value {
      font-size: 3rem;
      font-weight: 800;
      color: var(--warning);
      line-height: 1.1;
      margin-bottom: 0.5rem;
      letter-spacing: -0.03em;
    }
    .counter-label {
      font-size: 0.95rem;
      color: #CBD5E1;
    }

    /* Section 8: Testimonials */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .testimonial-card {
      background: #FFFFFF;
      padding: 2rem;
      border-radius: var(--radius-md);
      border: 1px solid var(--slate-200);
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .testimonial-stars {
      color: #F59E0B;
      font-size: 1.1rem;
      margin-bottom: 1rem;
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 0.85rem;
      margin-top: 1.5rem;
      padding-top: 1.25rem;
      border-top: 1px solid var(--slate-100);
    }
    .testimonial-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 700;
      font-size: 0.95rem;
    }

    /* Section 9: Industry News */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .news-card {
      background: #FFFFFF;
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-md);
      padding: 1.75rem;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .news-date {
      font-size: 0.8rem;
      color: var(--slate-600);
      margin-bottom: 0.75rem;
    }

    /* Section 10: FAQ */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-md);
      margin-bottom: 1rem;
      overflow: hidden;
    }
    .faq-header {
      padding: 1.25rem 1.5rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--slate-900);
      background: #FFFFFF;
      user-select: none;
      transition: background-color 0.2s ease;
    }
    .faq-header:hover {
      background-color: var(--slate-50);
    }
    .faq-content {
      padding: 0 1.5rem 1.25rem;
      color: var(--slate-600);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    /* Section 11: Final Form */
    .final-cta-section {
      background: linear-gradient(rgba(15, 76, 129, 0.95), rgba(10, 25, 47, 0.96)), url('/assets/images/3caa7a60d33eedf7.jpg') center/cover no-repeat;
      color: #FFFFFF;
      padding: 5rem 0;
    }
    .form-panel-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3.5rem;
      align-items: center;
    }
    .cta-form {
      background: #FFFFFF;
      padding: 2.25rem;
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
      color: var(--slate-900);
    }
    .form-group {
      margin-bottom: 1.25rem;
    }
    .form-group label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 0.4rem;
      color: var(--slate-700);
    }
    .form-control {
      width: 100%;
      padding: 0.75rem 1rem;
      border: 1px solid var(--slate-300);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s ease;
    }
    .form-control:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(0, 168, 150, 0.15);
    }

    /* Footer */
    .site-footer {
      background-color: #07101C;
      color: #94A3B8;
      padding: 4.5rem 0 2rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.9rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 3rem;
      margin-bottom: 3.5rem;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 1.25rem;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 0.7rem;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      padding-top: 2rem;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      text-align: center;
      font-size: 0.825rem;
      color: #64748B;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .matrix-grid, .products-grid, .story-card-grid, .testimonial-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .counter-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .top-bar { display: none; }
      .mobile-menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 1.5rem;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--slate-200);
      }
      .nav-links.active {
        display: flex;
      }
      .hero-title { font-size: 2rem; }
      .tech-grid, .dark-layout, .form-panel-grid {
        grid-template-columns: 1fr;
      }
      .matrix-grid, .products-grid, .story-card-grid, .testimonial-grid, .news-grid, .counter-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .section-padding { padding: 3.5rem 0; }
    }