/* roulang page: index */
:root {
      --primary: #1A56DB;
      --primary-hover: #1646B6;
      --accent: #0E9F6E;
      --accent-hover: #097d56;
      --bg-main: #F8FAFC;
      --surface: #FFFFFF;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-color: #E2E8F0;
      --dark-bg: #0F1E36;
      --radius: 10px;
      --shadow-sm: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
      --shadow-hover: 0 12px 28px -4px rgba(15, 23, 42, 0.12);
      --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

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

    body {
      font-family: var(--font-family);
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.65;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

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

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .section {
      padding: 85px 0;
    }

    .section-alt {
      background-color: #FFFFFF;
    }

    .section-dark {
      background-color: var(--dark-bg);
      color: #FFFFFF;
    }

    .section-header {
      text-align: center;
      max-width: 820px;
      margin: 0 auto 50px auto;
    }

    .section-badge {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      background-color: #EFF6FF;
      border: 1px solid #DBEAFE;
      padding: 4px 14px;
      border-radius: 9999px;
      margin-bottom: 14px;
    }

    .section-dark .section-badge {
      background: rgba(30, 64, 175, 0.35);
      border-color: rgba(96, 165, 250, 0.4);
      color: #93C5FD;
    }

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

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

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius);
      cursor: pointer;
      border: none;
      transition: all 0.25s ease;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(26, 86, 219, 0.35);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
    }

    .btn-outline {
      background-color: transparent;
      color: var(--primary);
      border: 1px solid var(--primary);
    }

    .btn-outline:hover {
      background-color: #EFF6FF;
      transform: translateY(-2px);
    }

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

    .btn-dark-white:hover {
      background-color: #F1F5F9;
      transform: translateY(-2px);
    }

    /* Top Utility Bar */
    .utility-bar {
      background-color: #0B1320;
      color: #94A3B8;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .utility-wrapper {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .utility-info span {
      margin-right: 22px;
    }

    .status-indicator {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: #34D399;
    }

    .status-dot {
      width: 7px;
      height: 7px;
      background: #10B981;
      border-radius: 50%;
      box-shadow: 0 0 6px #10B981;
    }

    /* Main Nav */
    .site-header {
      position: sticky;
      top: 0;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      z-index: 1000;
      box-shadow: 0 1px 3px rgba(0,0,0,0.05);
      border-bottom: 1px solid var(--border-color);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 800;
      color: var(--primary);
    }

    .brand-logo-icon {
      width: 34px;
      height: 34px;
      background: linear-gradient(135deg, #1A56DB, #0E9F6E);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFF;
      font-weight: 900;
      font-size: 18px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 28px;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: #334155;
    }

    .nav-links a:hover {
      color: var(--primary);
    }

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

    /* Section 1: Hero */
    .hero-section {
      background: radial-gradient(circle at 80% 20%, rgba(26, 86, 219, 0.08) 0%, rgba(248, 250, 252, 1) 70%), url('/assets/images/7df5abc7d3e7633a.jpg') no-repeat center right / cover;
      position: relative;
      padding: 90px 0 100px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-layout {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 50px;
      align-items: center;
    }

    .hero-h1 {
      font-size: 44px;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

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

    .hero-badge-group {
      display: flex;
      gap: 12px;
      margin-bottom: 24px;
      flex-wrap: wrap;
    }

    .hero-badge-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #FFFFFF;
      border: 1px solid #E2E8F0;
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 13px;
      color: #334155;
      font-weight: 500;
    }

    .hero-badge-item svg {
      width: 16px;
      height: 16px;
      fill: var(--accent);
    }

    .hero-cta-group {
      display: flex;
      gap: 16px;
      align-items: center;
    }

    .hero-card {
      background: #FFFFFF;
      border-radius: 12px;
      padding: 30px;
      box-shadow: 0 10px 30px -5px rgba(15, 23, 42, 0.1);
      border: 1px solid var(--border-color);
    }

    .hero-card-header {
      padding-bottom: 16px;
      border-bottom: 1px solid var(--border-color);
      margin-bottom: 20px;
    }

    .hero-card-header h3 {
      font-size: 18px;
      color: var(--text-main);
      font-weight: 700;
    }

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

    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: #334155;
      margin-bottom: 6px;
    }

    .form-input {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid #CBD5E1;
      border-radius: 6px;
      font-size: 14px;
      outline: none;
      transition: border-color 0.2s;
    }

    .form-input:focus {
      border-color: var(--primary);
    }

    /* Section 2: About / Intro */
    .intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .intro-image-wrap {
      border-radius: 12px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
    }

    .intro-content h3 {
      font-size: 26px;
      margin-bottom: 18px;
      color: var(--text-main);
    }

    .intro-spec-list {
      margin-top: 24px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
    }

    .intro-spec-item {
      background: var(--bg-main);
      padding: 16px;
      border-radius: 8px;
      border-left: 3px solid var(--primary);
    }

    .intro-spec-item strong {
      display: block;
      color: var(--text-main);
      font-size: 15px;
      margin-bottom: 4px;
    }

    .intro-spec-item span {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* Section 3: Core Advantages */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .adv-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 30px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .adv-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-color: #BFDBFE;
    }

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

    .adv-card h4 {
      font-size: 18px;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .adv-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Section 4: Products Matrix (Blueprint Comparison) */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
      align-items: stretch;
    }

    .product-card {
      background: var(--surface);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 34px 28px;
      display: flex;
      flex-direction: column;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .product-card.featured {
      border: 2px solid var(--primary);
      box-shadow: 0 10px 30px -5px rgba(26, 86, 219, 0.18);
    }

    .featured-tag {
      position: absolute;
      top: -13px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary);
      color: #FFFFFF;
      font-size: 12px;
      padding: 3px 14px;
      border-radius: 20px;
      font-weight: 600;
    }

    .product-card h4 {
      font-size: 20px;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .product-target {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 20px;
      min-height: 38px;
    }

    .product-feature-list {
      list-style: none;
      margin-bottom: 30px;
      flex-grow: 1;
    }

    .product-feature-list li {
      position: relative;
      padding-left: 20px;
      font-size: 14px;
      color: #334155;
      margin-bottom: 12px;
    }

    .product-feature-list li::before {
      content: "✓";
      position: absolute;
      left: 0;
      color: var(--accent);
      font-weight: bold;
    }

    /* Section 5: Dark Showcase */
    .dark-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }

    .decision-step-list {
      margin-top: 30px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .decision-step-item {
      display: flex;
      gap: 16px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 16px 20px;
      border-radius: 8px;
    }

    .decision-step-num {
      width: 28px;
      height: 28px;
      border-radius: 50%;
      background: var(--primary);
      color: #FFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 13px;
      flex-shrink: 0;
    }

    .decision-step-item h5 {
      color: #FFFFFF;
      font-size: 15px;
      margin-bottom: 4px;
    }

    .decision-step-item p {
      color: #94A3B8;
      font-size: 13px;
      margin: 0;
    }

    /* Section 6: User Stories */
    .story-block {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
      margin-bottom: 60px;
    }

    .story-block:last-child {
      margin-bottom: 0;
    }

    .story-block.reversed .story-content {
      order: 1;
    }

    .story-block.reversed .story-media {
      order: 2;
    }

    .story-media {
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .story-tag {
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--primary);
      margin-bottom: 8px;
      display: block;
    }

    .story-title {
      font-size: 22px;
      color: var(--text-main);
      margin-bottom: 14px;
    }

    .story-desc {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .story-stats {
      display: flex;
      gap: 24px;
    }

    .story-stat-val {
      font-size: 22px;
      font-weight: 800;
      color: var(--primary);
    }

    .story-stat-lbl {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* Section 7: Metrics Bar */
    .metrics-container {
      background: #EFF6FF;
      border: 1px solid #DBEAFE;
      border-radius: 12px;
      padding: 40px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }

    .metric-value {
      font-size: 38px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
    }

    .metric-title {
      font-size: 14px;
      color: #334155;
      font-weight: 600;
    }

    /* Section 8: Testimonials */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .testi-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 30px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testi-text {
      font-size: 14px;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }

    .testi-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .testi-avatar {
      width: 44px;
      height: 44px;
      background: #DBEAFE;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }

    .testi-info h5 {
      font-size: 15px;
      color: var(--text-main);
    }

    .testi-info span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* Section 9: News / Insights */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .news-card {
      background: var(--surface);
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .news-body {
      padding: 24px;
    }

    .news-date {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 8px;
    }

    .news-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
      line-height: 1.4;
    }

    .news-summary {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Section 10: FAQ */
    .faq-wrapper {
      max-width: 800px;
      margin: 0 auto;
    }

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

    .faq-question {
      padding: 18px 22px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }

    .faq-toggle-icon {
      font-size: 18px;
      transition: transform 0.25s ease;
    }

    .faq-answer {
      padding: 0 22px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    .faq-item.active .faq-answer {
      padding: 0 22px 20px 22px;
      max-height: 300px;
    }

    .faq-item.active .faq-toggle-icon {
      transform: rotate(180deg);
    }

    /* Section 11: Compliance Bar */
    .compliance-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .compliance-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 20px;
      text-align: center;
    }

    .compliance-badge-icon {
      font-size: 24px;
      margin-bottom: 8px;
      color: var(--accent);
    }

    .compliance-card h5 {
      font-size: 15px;
      margin-bottom: 4px;
      color: var(--text-main);
    }

    .compliance-card p {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* Section 12: Final CTA */
    .cta-box {
      background: linear-gradient(135deg, #1A56DB 0%, #0F3E99 100%);
      border-radius: 16px;
      padding: 60px 40px;
      color: #FFFFFF;
      text-align: center;
    }

    .cta-box h2 {
      font-size: 32px;
      margin-bottom: 16px;
    }

    .cta-box p {
      font-size: 16px;
      color: #DBEAFE;
      max-width: 650px;
      margin: 0 auto 30px auto;
    }

    .cta-form {
      max-width: 540px;
      margin: 0 auto;
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
    }

    .cta-input {
      flex: 1 1 240px;
      padding: 14px 18px;
      border-radius: 6px;
      border: 1px solid rgba(255,255,255,0.3);
      font-size: 15px;
      outline: none;
    }

    .cta-submit {
      padding: 14px 28px;
      background: #0E9F6E;
      color: #FFFFFF;
      border: none;
      border-radius: 6px;
      font-weight: 700;
      cursor: pointer;
      transition: background 0.2s;
    }

    .cta-submit:hover {
      background: #097d56;
    }

    /* Footer */
    .site-footer {
      background: #0B1320;
      color: #94A3B8;
      padding: 60px 0 30px 0;
      border-top: 1px solid #1E293B;
    }

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

    .footer-col h5 {
      color: #FFFFFF;
      font-size: 15px;
      margin-bottom: 16px;
    }

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

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

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

    .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;
      flex-wrap: wrap;
      gap: 12px;
    }

    /* Mobile Responsive */
    @media (max-width: 1024px) {
      .hero-layout, .intro-grid, .dark-layout, .story-block {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .advantages-grid, .products-grid, .news-grid, .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-container, .compliance-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 767px) {
      .utility-bar {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-hover);
        gap: 16px;
      }
      .nav-links.active {
        display: flex;
      }
      .hero-h1 {
        font-size: 30px;
      }
      .section-title {
        font-size: 24px;
      }
      .advantages-grid, .products-grid, .news-grid, .testimonials-grid, .metrics-container, .compliance-grid {
        grid-template-columns: 1fr;
      }
      .story-block.reversed .story-content {
        order: unset;
      }
      .story-block.reversed .story-media {
        order: unset;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .cta-box {
        padding: 40px 20px;
      }
    }