/* roulang page: index */
:root {
      --primary: #4F46E5;
      --primary-gradient: linear-gradient(135deg, #4F46E5 0%, #7C3AED 100%);
      --primary-hover: #4338CA;
      --accent-green: #10B981;
      --accent-amber: #F59E0B;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0F172A;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: rgba(226, 232, 240, 0.9);
      --card-radius: 20px;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 20px 25px -5px rgba(79, 70, 229, 0.08), 0 8px 10px -6px rgba(79, 70, 229, 0.04);
      --shadow-hover: 0 25px 35px -5px rgba(79, 70, 229, 0.15);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    }

    body {
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.65;
      font-size: 16px;
      overflow-x: hidden;
    }

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

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

    ul {
      list-style: none;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Top Bar */
    .top-bar {
      background-color: #0B1120;
      color: #94A3B8;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-info span {
      margin-right: 20px;
    }

    /* Header */
    .header {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      position: sticky;
      top: 0;
      z-index: 1000;
      border-bottom: 1px solid var(--border-color);
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 76px;
    }
    .logo {
      font-size: 24px;
      font-weight: 800;
      color: #1E1B4B;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-badge {
      background: var(--primary-gradient);
      color: #fff;
      font-size: 12px;
      padding: 2px 8px;
      border-radius: 6px;
      font-weight: 600;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-body);
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .btn-cta {
      background: var(--primary-gradient);
      color: #fff;
      padding: 10px 24px;
      border-radius: 9999px;
      font-weight: 600;
      font-size: 14px;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(79, 70, 229, 0.35);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* Section Global */
    section {
      padding: 90px 0;
      position: relative;
    }
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 56px;
    }
    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      background: rgba(79, 70, 229, 0.1);
      color: var(--primary);
      font-size: 13px;
      font-weight: 700;
      border-radius: 9999px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 34px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Cards System */
    .card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--card-radius);
      padding: 32px;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(79, 70, 229, 0.3);
    }

    /* Hero Section */
    .hero-section {
      padding: 70px 0 90px;
      background: radial-gradient(circle at 10% 20%, rgba(79, 70, 229, 0.06) 0%, rgba(255, 255, 255, 0) 60%),
                  radial-gradient(circle at 90% 80%, rgba(124, 58, 237, 0.05) 0%, rgba(255, 255, 255, 0) 60%);
      border-bottom: 1px solid var(--border-color);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-h1 {
      font-size: 44px;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
    }
    .hero-h1 span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-intro {
      font-size: 16px;
      color: var(--text-body);
      line-height: 1.8;
      margin-bottom: 32px;
    }
    .hero-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-bottom: 32px;
    }
    .badge-capsule {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 16px;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 9999px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
    }
    .badge-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--accent-green);
    }
    .hero-actions {
      display: flex;
      gap: 16px;
    }
    .btn-secondary {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      color: var(--text-main);
      padding: 12px 28px;
      border-radius: 9999px;
      font-weight: 600;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
    }
    .btn-secondary:hover {
      background: #F1F5F9;
      border-color: #CBD5E1;
    }
    .hero-media {
      position: relative;
      border-radius: var(--card-radius);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 4px solid #FFFFFF;
    }
    .hero-media img {
      width: 100%;
      height: 420px;
      object-fit: cover;
    }

    /* 2. Pain Points */
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .pain-card {
      border-top: 4px solid #EF4444;
      background: #FFFFFF;
    }
    .pain-icon {
      font-size: 28px;
      color: #EF4444;
      margin-bottom: 16px;
    }
    .pain-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .pain-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 3. About Section */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .about-img-wrap {
      border-radius: var(--card-radius);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
    }
    .about-img-wrap img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }
    .spec-item {
      display: flex;
      gap: 16px;
      margin-top: 20px;
    }
    .spec-box {
      background: #F8FAFC;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 16px;
      flex: 1;
    }
    .spec-num {
      font-size: 20px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .spec-label {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 4. Features Grid */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      position: relative;
      overflow: hidden;
    }
    .feature-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: rgba(79, 70, 229, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 22px;
      margin-bottom: 20px;
    }
    .feature-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .feature-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 5. Process Horizontal */
    .process-container {
      position: relative;
    }
    .process-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
      z-index: 2;
    }
    .process-card {
      background: #FFFFFF;
      position: relative;
    }
    .step-badge {
      width: 36px;
      height: 36px;
      background: var(--primary-gradient);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 16px;
      margin-bottom: 16px;
    }
    .process-card h4 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .process-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 6. Products Showcase */
    .product-card {
      padding: 0;
      overflow: hidden;
    }
    .product-img {
      height: 200px;
      width: 100%;
      object-fit: cover;
    }
    .product-content {
      padding: 24px;
    }
    .product-tags {
      display: flex;
      gap: 8px;
      margin-bottom: 12px;
    }
    .tag-sm {
      font-size: 12px;
      padding: 3px 8px;
      border-radius: 4px;
      background: #F1F5F9;
      color: #475569;
      font-weight: 600;
    }
    .product-title {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .product-desc {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 16px;
    }
    .product-stats {
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
      display: flex;
      justify-content: space-between;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
    }

    /* 7. Dark Tech Section */
    .dark-section {
      background: var(--bg-dark);
      color: #F8FAFC;
    }
    .dark-section .section-title {
      color: #FFFFFF;
    }
    .dark-section .section-desc {
      color: #94A3B8;
    }
    .tech-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .tech-card {
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--card-radius);
      padding: 24px;
      margin-bottom: 20px;
    }
    .tech-card h4 {
      font-size: 18px;
      color: #38BDF8;
      margin-bottom: 8px;
    }
    .tech-card p {
      font-size: 14px;
      color: #94A3B8;
      line-height: 1.6;
    }

    /* 8. Stories Section */
    .grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .story-card {
      background: #FFFFFF;
      border-left: 4px solid var(--primary);
    }
    .story-team {
      font-size: 14px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 6px;
    }
    .story-title {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .story-metrics {
      display: flex;
      gap: 20px;
      background: #F8FAFC;
      padding: 16px;
      border-radius: 12px;
      margin: 16px 0;
    }
    .story-m-item div:first-child {
      font-size: 22px;
      font-weight: 800;
      color: var(--accent-green);
    }
    .story-m-item div:last-child {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 9. Metrics Section */
    .metrics-section {
      background: var(--primary-gradient);
      color: #FFFFFF;
      padding: 60px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-number {
      font-size: 42px;
      font-weight: 900;
      margin-bottom: 4px;
      letter-spacing: -1px;
    }
    .metric-title {
      font-size: 15px;
      opacity: 0.9;
    }

    /* 10. Testimonials */
    .testi-header {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }
    .testi-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }
    .testi-role {
      font-size: 13px;
      color: var(--text-muted);
    }
    .testi-stars {
      color: var(--accent-amber);
      font-size: 14px;
      margin-bottom: 12px;
    }

    /* 11. News Section */
    .news-card {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .news-date {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .news-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .news-desc {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 16px;
      line-height: 1.6;
    }
    .news-link {
      font-size: 14px;
      font-weight: 700;
      color: var(--primary);
    }

    /* 12. FAQ Accordion */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }
    .accordion-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      margin-bottom: 16px;
      overflow: hidden;
      transition: var(--transition);
    }
    .accordion-header {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 700;
      font-size: 17px;
      color: var(--text-main);
      user-select: none;
    }
    .accordion-icon {
      font-size: 20px;
      transition: transform 0.3s ease;
      color: var(--primary);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #F8FAFC;
    }
    .accordion-content-inner {
      padding: 0 24px 20px;
      font-size: 15px;
      color: var(--text-body);
      line-height: 1.7;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(45deg);
    }
    .accordion-item.active .accordion-content {
      max-height: 200px;
    }

    /* 13. Contact Form CTA */
    .contact-card-wrap {
      max-width: 920px;
      margin: 0 auto;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 24px;
      padding: 48px;
      box-shadow: var(--shadow-lg);
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .form-group.full {
      grid-column: span 2;
    }
    .form-label {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }
    .form-control {
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      font-size: 15px;
      outline: none;
      transition: var(--transition);
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }

    /* Footer */
    .footer {
      background: #0B1120;
      color: #94A3B8;
      padding: 70px 0 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-brand h3 {
      color: #FFFFFF;
      font-size: 22px;
      margin-bottom: 12px;
    }
    .footer-brand p {
      font-size: 14px;
      line-height: 1.7;
      max-width: 320px;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 16px;
      margin-bottom: 16px;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      font-size: 14px;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .grid-4, .process-grid, .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .hero-grid, .about-grid, .tech-grid, .grid-2, .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full {
        grid-column: span 1;
      }
      .grid-4, .grid-3, .process-grid, .metrics-grid {
        grid-template-columns: 1fr;
      }
      .hero-h1 {
        font-size: 30px;
      }
      .section-title {
        font-size: 26px;
      }
      .nav-menu {
        position: fixed;
        top: 76px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 30px;
        gap: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
        display: none;
      }
      .nav-menu.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .top-bar-info span:nth-child(2) {
        display: none;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
      .contact-card-wrap {
        padding: 24px;
      }
    }