/* roulang page: index */
:root {
      --primary: #0F2C59;
      --primary-dark: #0A1E3D;
      --accent: #00B894;
      --accent-hover: #009879;
      --bg-light: #F8FAFC;
      --bg-dark: #0A1128;
      --warning: #E17055;
      --text-main: #1E293B;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --shadow-soft: 0 4px 20px rgba(15, 44, 89, 0.06);
      --shadow-hover: 0 12px 30px rgba(15, 44, 89, 0.12);
      --glow-accent: 0 0 18px rgba(0, 184, 148, 0.35);
    }

    /* Reset & Base */
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
      font-size: 16px;
      line-height: 1.75;
      color: var(--text-body);
      background-color: var(--bg-light);
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, h5, h6 {
      color: var(--text-main);
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: -0.02em;
    }
    a { color: var(--primary); text-decoration: none; transition: all 0.25s ease; }
    a:hover { color: var(--accent); }
    img { max-width: 100%; height: auto; display: block; }
    
    /* Global Layout Components */
    .section-wrap { padding: 90px 0; position: relative; }
    .section-wrap.dark-theme { background-color: var(--bg-dark); color: #E2E8F0; }
    .section-wrap.dark-theme h2, .section-wrap.dark-theme h3, .section-wrap.dark-theme h4 { color: #FFFFFF; }
    .section-wrap.dark-theme p { color: #94A3B8; }
    .section-wrap.alt-bg { background-color: #FFFFFF; }

    .sec-head { text-align: center; max-width: 840px; margin: 0 auto 55px auto; }
    .sec-subtitle {
      display: inline-block;
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--accent);
      text-transform: uppercase;
      letter-spacing: 0.08em;
      margin-bottom: 8px;
    }
    .sec-title { font-size: 2.2rem; margin-bottom: 16px; }
    .sec-lead { font-size: 1.05rem; color: var(--text-muted); line-height: 1.7; margin-bottom: 0; }

    /* Buttons & Badges */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all 0.25s cubic-bezier(0.165, 0.84, 0.44, 1);
      border: 1px solid transparent;
      min-height: 46px;
    }
    .btn-primary {
      background-color: var(--accent);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(0, 184, 148, 0.3);
    }
    .btn-primary:hover {
      background-color: var(--accent-hover);
      color: #FFFFFF;
      transform: translateY(-2px);
      box-shadow: var(--glow-accent);
    }
    .btn-navy {
      background-color: var(--primary);
      color: #FFFFFF;
    }
    .btn-navy:hover {
      background-color: var(--primary-dark);
      color: #FFFFFF;
      transform: translateY(-2px);
    }
    .btn-ghost {
      border-color: rgba(255, 255, 255, 0.35);
      color: #FFFFFF;
      background: rgba(255, 255, 255, 0.05);
    }
    .btn-ghost:hover {
      background: #FFFFFF;
      color: var(--primary);
      border-color: #FFFFFF;
    }
    .btn-warning {
      background-color: var(--warning);
      color: #FFFFFF;
    }
    .btn-warning:hover {
      background-color: #d35400;
      color: #FFFFFF;
      transform: translateY(-2px);
    }

    /* Top Information Bar */
    .top-utility-bar {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.82rem;
      color: var(--text-muted);
      padding: 8px 0;
    }
    .top-utility-bar .contact-info span { margin-right: 20px; }
    .top-utility-bar .contact-info i { color: var(--accent); margin-right: 6px; }

    /* Sticky Main Navigation */
    .site-header {
      background: rgba(255, 255, 255, 0.98);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 1000;
      box-shadow: 0 2px 10px rgba(15, 44, 89, 0.03);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      min-height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.01em;
    }
    .brand-logo i {
      font-size: 1.6rem;
      color: var(--accent);
    }
    .main-nav ul {
      display: flex;
      list-style: none;
      margin: 0;
      padding: 0;
      gap: 24px;
    }
    .main-nav a {
      font-size: 0.96rem;
      font-weight: 600;
      color: var(--text-body);
      position: relative;
      padding: 6px 0;
    }
    .main-nav a:hover, .main-nav a.active {
      color: var(--accent);
    }
    .main-nav a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .main-nav a:hover::after, .main-nav a.active::after {
      width: 100%;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .search-mock {
      display: flex;
      align-items: center;
      background: #F1F5F9;
      border-radius: 30px;
      padding: 6px 14px;
      border: 1px solid transparent;
    }
    .search-mock:focus-within {
      border-color: var(--accent);
      background: #FFFFFF;
    }
    .search-mock input {
      border: none;
      background: transparent;
      outline: none;
      font-size: 0.85rem;
      margin: 0;
      padding: 0 8px;
      width: 130px;
      box-shadow: none;
      height: auto;
    }

    /* 1. Hero Section (Banner Carousel & Docs Hub) */
    .hero-banner {
      position: relative;
      background: linear-gradient(135deg, rgba(10, 17, 40, 0.94) 0%, rgba(15, 44, 89, 0.92) 100%),
                  url('/assets/images/09da428006810c51.jpg') center/cover no-repeat;
      color: #FFFFFF;
      padding: 100px 0 90px;
      overflow: hidden;
    }
    .hero-content {
      max-width: 880px;
      margin: 0 auto;
      text-align: center;
    }
    .hero-pill {
      display: inline-flex;
      align-items: center;
      background: rgba(0, 184, 148, 0.15);
      border: 1px solid rgba(0, 184, 148, 0.4);
      color: #00F5C4;
      padding: 5px 16px;
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 3.2rem;
      color: #FFFFFF;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    }
    .hero-desc {
      font-size: 1.15rem;
      color: #CBD5E1;
      max-width: 740px;
      margin: 0 auto 36px;
      line-height: 1.8;
    }
    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }
    .hero-search-box {
      background: rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: 40px;
      padding: 6px 8px 6px 20px;
      display: flex;
      max-width: 580px;
      margin: 0 auto 20px;
    }
    .hero-search-box input {
      background: transparent;
      border: none;
      outline: none;
      color: #FFFFFF;
      margin: 0;
      font-size: 0.95rem;
      box-shadow: none;
      height: 42px;
    }
    .hero-search-box input::placeholder { color: #94A3B8; }
    .hero-hot-chips {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      flex-wrap: wrap;
      font-size: 0.85rem;
      color: #94A3B8;
    }
    .hero-hot-chips span { color: #CBD5E1; }
    .hero-hot-chips a {
      color: #00F5C4;
      background: rgba(255, 255, 255, 0.08);
      padding: 3px 12px;
      border-radius: 20px;
    }
    .hero-trust-bar {
      margin-top: 50px;
      padding-top: 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.12);
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 20px;
    }
    .trust-badge-item {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 0.95rem;
      color: #E2E8F0;
      font-weight: 500;
    }
    .trust-badge-item i { color: var(--accent); font-size: 1.3rem; }

    /* 2. Industry Pain Points */
    .pain-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 26px;
      height: 100%;
      box-shadow: var(--shadow-soft);
      position: relative;
      overflow: hidden;
      border-top: 4px solid var(--warning);
    }
    .pain-card.solution-edge { border-top-color: var(--accent); }
    .pain-icon {
      width: 52px;
      height: 52px;
      border-radius: 12px;
      background: #FFF5F2;
      color: var(--warning);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 20px;
    }
    .pain-card.solution-edge .pain-icon {
      background: #E6FBF5;
      color: var(--accent);
    }
    .pain-card h4 { font-size: 1.2rem; margin-bottom: 12px; }
    .pain-card p { font-size: 0.92rem; color: var(--text-muted); line-height: 1.68; margin-bottom: 0; }

    /* 3. Platform Architecture */
    .arch-diagram-wrapper {
      background: #0D1B2A;
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .arch-layer {
      background: rgba(255, 255, 255, 0.05);
      border: 1px dashed rgba(0, 184, 148, 0.4);
      border-radius: var(--radius-sm);
      padding: 14px 18px;
      margin-bottom: 12px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .arch-layer:last-child { margin-bottom: 0; }
    .arch-tag {
      font-size: 0.8rem;
      padding: 2px 8px;
      border-radius: 4px;
      background: var(--accent);
      color: #FFFFFF;
      font-weight: 600;
    }
    .arch-spec-list {
      list-style: none;
      margin: 24px 0 0;
      padding: 0;
    }
    .arch-spec-list li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 0.95rem;
    }
    .arch-spec-list li i {
      color: var(--accent);
      font-size: 1.1rem;
      margin-top: 4px;
    }

    /* 4. Core Advantages Matrix (6 Grid) */
    .advantage-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      transition: all 0.3s ease;
      height: 100%;
      box-shadow: var(--shadow-soft);
    }
    .advantage-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0, 184, 148, 0.4);
    }
    .adv-icon-wrap {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: #F0FDF4;
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      margin-bottom: 18px;
    }
    .advantage-card h4 { font-size: 1.15rem; margin-bottom: 10px; }
    .advantage-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.65; margin-bottom: 0; }

    /* 5. Hot Products */
    .product-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-soft);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .product-img {
      height: 200px;
      overflow: hidden;
      position: relative;
    }
    .product-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .product-box:hover .product-img img { transform: scale(1.05); }
    .product-body {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }
    .product-tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      margin-bottom: 14px;
    }
    .product-tags span {
      background: #F1F5F9;
      color: var(--text-body);
      font-size: 0.78rem;
      padding: 3px 10px;
      border-radius: 4px;
      font-weight: 500;
    }
    .product-body h4 { font-size: 1.25rem; margin-bottom: 10px; }
    .product-body p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.65; margin-bottom: 20px; flex-grow: 1; }

    /* 6. Dark Tech Showcase */
    .dark-showcase-box {
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-md);
      background: rgba(255, 255, 255, 0.02);
      padding: 34px;
    }
    .tech-metric-row {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }
    .metric-pill {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-sm);
      padding: 16px;
      text-align: center;
    }
    .metric-pill .num {
      font-size: 1.8rem;
      font-weight: 800;
      color: #00F5C4;
      display: block;
      line-height: 1.2;
    }
    .metric-pill .label { font-size: 0.85rem; color: #94A3B8; }

    /* 7. Operator Stories */
    .story-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 26px;
      box-shadow: var(--shadow-soft);
      height: 100%;
    }
    .story-badge {
      display: inline-block;
      font-size: 0.8rem;
      color: var(--primary);
      background: #EBF3FF;
      padding: 2px 10px;
      border-radius: 4px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .story-card h4 { font-size: 1.18rem; margin-bottom: 10px; }
    .story-card p { font-size: 0.9rem; color: var(--text-muted); line-height: 1.65; margin-bottom: 16px; }
    .story-result {
      background: #F8FAFC;
      border-left: 3px solid var(--accent);
      padding: 10px 14px;
      font-size: 0.88rem;
      color: var(--text-main);
      font-weight: 500;
    }

    /* 8. Key Metrics Bar */
    .metrics-bar-wrap {
      background: linear-gradient(90deg, #0A1E3D 0%, #0F2C59 100%);
      color: #FFFFFF;
      padding: 45px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    .metric-item { text-align: center; }
    .metric-item .big-number {
      font-size: 2.6rem;
      font-weight: 800;
      color: #00F5C4;
      line-height: 1.1;
      font-variant-numeric: tabular-nums;
      margin-bottom: 6px;
    }
    .metric-item .caption {
      font-size: 0.92rem;
      color: #CBD5E1;
      margin-bottom: 0;
    }

    /* 9. Testimonials */
    .testimonial-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 30px;
      box-shadow: var(--shadow-soft);
      height: 100%;
      position: relative;
    }
    .stars { color: #F59E0B; margin-bottom: 14px; font-size: 0.95rem; }
    .testimonial-card p { font-style: normal; font-size: 0.93rem; color: var(--text-body); line-height: 1.7; margin-bottom: 20px; }
    .client-meta { display: flex; align-items: center; gap: 12px; }
    .client-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 700;
      font-size: 1.1rem;
    }
    .client-info h5 { margin: 0; font-size: 0.95rem; }
    .client-info span { font-size: 0.8rem; color: var(--text-muted); }

    /* 10. News & Insights */
    .news-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 22px;
      box-shadow: var(--shadow-soft);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .news-date { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 8px; }
    .news-card h4 { font-size: 1.05rem; line-height: 1.45; margin-bottom: 10px; }
    .news-card p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.6; margin-bottom: 16px; flex-grow: 1; }
    .news-tag {
      font-size: 0.78rem;
      color: var(--accent);
      background: #E6FBF5;
      padding: 2px 8px;
      border-radius: 4px;
      display: inline-block;
      width: fit-content;
    }

    /* 11. FAQ Accordion (Foundation overrides) */
    .accordion { border: none; background: transparent; }
    .accordion-item {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      background: #FFFFFF;
      overflow: hidden;
    }
    .accordion-title {
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      padding: 18px 24px;
      border: none;
      transition: background 0.2s ease;
    }
    .accordion-title:hover { background: #F8FAFC; color: var(--accent); }
    .accordion-title::before {
      font-size: 1.1rem;
      right: 24px;
      content: '+' !important;
      font-weight: normal;
    }
    .is-active > .accordion-title::before { content: '–' !important; }
    .accordion-content {
      padding: 20px 24px;
      font-size: 0.93rem;
      color: var(--text-body);
      line-height: 1.7;
      border-top: 1px solid var(--border-color);
      background: #FFFFFF;
    }

    /* 12. Final CTA & Contact Form */
    .cta-form-container {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: 0 10px 40px rgba(15, 44, 89, 0.08);
    }
    .custom-field { margin-bottom: 20px; }
    .custom-field label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .custom-field input, .custom-field select, .custom-field textarea {
      width: 100%;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 10px 14px;
      font-size: 0.92rem;
      color: var(--text-body);
      background: #F8FAFC;
      transition: all 0.2s ease;
      box-shadow: none;
    }
    .custom-field input:focus, .custom-field select:focus, .custom-field textarea:focus {
      background: #FFFFFF;
      border-color: var(--accent);
      outline: none;
      box-shadow: 0 0 0 3px rgba(0, 184, 148, 0.15);
    }

    /* Footer */
    .site-footer {
      background: #08111E;
      color: #94A3B8;
      font-size: 0.9rem;
      padding: 70px 0 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
    }
    .footer-col h5 {
      color: #FFFFFF;
      font-size: 1.05rem;
      margin-bottom: 20px;
      position: relative;
    }
    .footer-links { list-style: none; margin: 0; padding: 0; }
    .footer-links li { margin-bottom: 10px; }
    .footer-links a { color: #94A3B8; font-size: 0.88rem; }
    .footer-links a:hover { color: #00F5C4; padding-left: 4px; }
    .footer-bottom {
      margin-top: 50px;
      padding-top: 25px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.82rem;
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
    }

    /* Responsive */
    @media (max-width: 1023px) {
      .hero-title { font-size: 2.4rem; }
      .main-nav { display: none; }
      .nav-actions .search-mock { display: none; }
      .section-wrap { padding: 60px 0; }
    }
    @media (max-width: 639px) {
      .hero-title { font-size: 1.85rem; }
      .sec-title { font-size: 1.65rem; }
      .top-utility-bar { display: none; }
      .cta-form-container { padding: 24px; }
      .footer-bottom { flex-direction: column; text-align: center; }
    }