/* roulang page: index */
:root {
      --primary: #0F4C81;
      --primary-deep: #0A3A62;
      --accent: #C5A059;
      --bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --text-primary: #1E293B;
      --text-secondary: #475569;
      --text-muted: #64748B;
      --border-light: #E2E8F0;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.02);
      --shadow-md: 0 10px 30px -10px rgba(0,0,0,0.08);
      --shadow-lg: 0 20px 40px -12px rgba(0,0,0,0.1);
      --radius-card: 16px;
      --radius-btn: 8px;
      --transition: all 0.3s ease;
      --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      --max-width: 1280px;
      --section-padding: 100px 24px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      font-size: 16px;
    }

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

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Navigation */
    .header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(248, 250, 252, 0.85);
      backdrop-filter: blur(10px);
      box-shadow: 0 1px 0 rgba(0,0,0,0.02);
    }

    .navbar-brand {
      font-weight: 800;
      font-size: 1.5rem;
      letter-spacing: -0.02em;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .brand-icon {
      width: 28px;
      height: 28px;
      color: var(--accent);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 16px 0;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .btn-primary-nav {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 4px 10px rgba(15,76,129,0.2);
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }

    .btn-primary-nav:hover {
      background: var(--primary-deep);
      transform: translateY(-1px);
      box-shadow: 0 8px 18px rgba(15,76,129,0.25);
    }

    .channel-bar {
      background: white;
      border-top: 1px solid var(--border-light);
      padding: 12px 0;
      overflow-x: auto;
      -webkit-overflow-scrolling: touch;
    }

    .channel-list {
      display: flex;
      gap: 32px;
      white-space: nowrap;
      font-weight: 500;
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    .channel-list a {
      position: relative;
      padding-bottom: 6px;
      color: inherit;
    }

    .channel-list a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }

    .channel-list a:hover,
    .channel-list a.active {
      color: var(--primary);
    }

    .channel-list a:hover::after,
    .channel-list a.active::after {
      width: 100%;
    }

    /* Hero */
    .hero {
      min-height: 80vh;
      display: flex;
      align-items: center;
      background: linear-gradient(180deg, #FFFFFF 0%, var(--bg) 100%);
      padding: 40px 0 80px;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 52px;
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: #0F2240;
      margin-bottom: 24px;
    }

    .hero-content p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 40px;
      max-width: 90%;
    }

    .cta-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      border: none;
      cursor: pointer;
      box-shadow: var(--shadow-md);
      transition: var(--transition);
    }

    .btn-primary:hover {
      background: var(--primary-deep);
      transform: translateY(-2px);
      box-shadow: var(--shadow-lg);
    }

    .btn-ghost {
      background: transparent;
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      border: 1px solid var(--primary);
      cursor: pointer;
      transition: var(--transition);
    }

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

    .hero-visual {
      position: relative;
    }

    .hero-image {
      width: 100%;
      border-radius: 24px;
      box-shadow: var(--shadow-lg);
    }

    /* Sections */
    section {
      padding: var(--section-padding);
    }

    .section-title {
      font-size: 36px;
      font-weight: 700;
      letter-spacing: -0.01em;
      color: var(--text-primary);
      margin-bottom: 16px;
    }

    .section-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 60px;
    }

    /* Features Bento Grid */
    .features-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }

    .feature-card {
      background: var(--card-bg);
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .feature-card.large {
      grid-row: span 2;
    }

    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(15,76,129,0.08);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      color: var(--primary);
    }

    .feature-card h3 {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 14px;
    }

    .feature-card p {
      color: var(--text-secondary);
      line-height: 1.7;
    }

    .sub-grid {
      display: grid;
      gap: 24px;
    }

    /* Scenarios */
    .scenario-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 80px;
      align-items: center;
      margin-bottom: 100px;
    }

    .scenario-text h3 {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .scenario-text p {
      color: var(--text-secondary);
      font-size: 17px;
    }

    .scenario-image {
      background: #EDF2F7;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }

    /* Cases Carousel */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scroll-snap-type: x mandatory;
    }

    .case-card {
      flex: 0 0 320px;
      background: #EEF2F6;
      border-radius: var(--radius-card);
      padding: 28px;
      scroll-snap-align: start;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .case-stat {
      font-size: 36px;
      font-weight: 800;
      color: var(--accent);
    }

    .case-quote {
      font-style: italic;
      color: var(--text-primary);
    }

    /* Pricing */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .pricing-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 40px 28px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
      border: 1px solid transparent;
    }

    .pricing-card.featured {
      border-color: var(--primary);
      box-shadow: var(--shadow-md);
      transform: scale(1.02);
    }

    .price {
      font-size: 42px;
      font-weight: 800;
      color: var(--primary);
      margin: 20px 0;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }

    .faq-question {
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    /* Footer */
    .footer {
      background: #1a202c;
      color: #CBD5E0;
      padding: 60px 24px 30px;
    }

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

    .footer a:hover {
      color: var(--accent);
    }

    @media (max-width: 1024px) {
      .hero-grid, .scenario-row, .features-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .pricing-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      h1 { font-size: 36px !important; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .channel-list { gap: 20px; }
    }