/* roulang page: index */
:root {
      --primary-teal: #0D9488;
      --primary-dark: #0F766E;
      --accent-amber: #D97706;
      --accent-dark: #B45309;
      --bg-light: #F0FDFA;
      --card-bg: #FFFFFF;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --text-teal: #0F766E;
      --border-light: #E2E8F0;
      --border-teal: #CCFBF1;
      --radius-card: 20px;
      --radius-btn: 14px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(13,148,136,0.12);
      --font-global: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-global);
      background-color: #F8FAFC;
      color: var(--text-main);
      line-height: 1.7;
      margin: 0;
      padding: 0;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .nav-blur {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226,232,240,0.6);
    }
    .text-gradient-teal {
      background: linear-gradient(135deg, #0D9488, #0F766E);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .bg-gradient-hero {
      background: linear-gradient(135deg, #0D9488 0%, #0F766E 100%);
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border-light);
      transition: all 0.25s ease;
      padding: 32px;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-teal);
      transform: translateY(-4px);
    }
    .btn-primary {
      background: linear-gradient(135deg, #0D9488, #0F766E);
      color: white;
      border-radius: 12px;
      padding: 14px 32px;
      font-weight: 600;
      transition: all 0.2s ease;
      box-shadow: 0 4px 12px rgba(13,148,136,0.2);
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #0F766E, #115E59);
      box-shadow: 0 8px 20px rgba(13,148,136,0.35);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-teal);
      color: var(--primary-teal);
      border-radius: 12px;
      padding: 14px 32px;
      font-weight: 600;
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: var(--bg-light);
      border-color: var(--primary-dark);
      color: var(--primary-dark);
    }
    .btn-accent {
      background: linear-gradient(135deg, #D97706, #B45309);
      color: white;
      border-radius: 14px;
      padding: 16px 40px;
      font-weight: 700;
      box-shadow: 0 8px 24px rgba(217,119,6,0.3);
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-accent:hover {
      background: linear-gradient(135deg, #B45309, #92400E);
      box-shadow: 0 12px 28px rgba(217,119,6,0.45);
      transform: scale(1.03);
    }
    .badge {
      background: #CCFBF1;
      color: #0F766E;
      padding: 4px 12px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 500;
    }
    .data-badge {
      background: linear-gradient(135deg, #F0FDFA, #FFFFFF);
      border-radius: 28px;
      padding: 32px 20px;
      text-align: center;
      box-shadow: 0 8px 24px rgba(0,0,0,0.02);
      border: 1px solid #E2E8F0;
      transition: 0.2s;
    }
    .data-badge:hover {
      border-color: var(--accent-amber);
      transform: scale(1.03);
    }
    .section-spacing {
      margin-bottom: 120px;
    }
    .hamburger-menu {
      display: none;
    }
    @media (max-width: 1024px) {
      .section-spacing {
        margin-bottom: 80px;
      }
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .hamburger-menu {
        display: block;
      }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        height: calc(100vh - 72px);
        background: white;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 32px;
        z-index: 50;
        backdrop-filter: blur(8px);
      }
      .mobile-menu.open {
        display: flex;
      }
      .hero-title {
        font-size: 32px;
      }
      .card {
        padding: 24px;
      }
      .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .data-row {
        flex-wrap: wrap;
        justify-content: center;
      }
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.2s;
      background: #F0FDFA;
      border-left: 3px solid #0D9488;
      margin-top: 8px;
      border-radius: 0 8px 8px 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 20px;
    }
    .faq-icon {
      transition: transform 0.25s;
      color: #0D9488;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }