/* roulang page: index */
:root {
      --primary-deep: #1B5E20;
      --primary-vivid: #2E7D32;
      --accent-black: #1A1A1A;
      --bg-light: #FAFAFA;
      --card-bg: #FFFFFF;
      --text-body: #4A4A4A;
      --text-muted: #8A8A8A;
      --text-heading: #1A1A1A;
      --border-light: rgba(0,0,0,0.04);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-lg: 24px;
      --radius-card: 16px;
      --radius-btn: 9999px;
      --transition-base: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'Noto Sans SC', 'Inter', system-ui, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-family: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
      font-weight: 700;
      color: var(--text-heading);
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 1rem;
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
      border: 1px solid transparent;
    }
    .card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
      border-color: var(--primary-deep);
    }
    .btn-primary {
      background-color: var(--primary-deep);
      color: white;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: 0 4px 6px rgba(0,0,0,0.1);
      transition: var(--transition-base);
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background-color: var(--primary-vivid);
      box-shadow: 0 6px 14px rgba(0,0,0,0.15);
    }
    .btn-outline {
      border: 2px solid var(--primary-deep);
      color: var(--primary-deep);
      background: transparent;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-base);
      display: inline-block;
      text-align: center;
      cursor: pointer;
    }
    .btn-outline:hover {
      background-color: var(--primary-deep);
      color: white;
    }
    .hero-bg {
      background: linear-gradient(135deg, #F1F8E9 0%, #FFFFFF 100%);
    }
    .footer-bg {
      background-color: var(--accent-black);
    }
    .nav-blur {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .active-nav {
      color: var(--primary-deep) !important;
      font-weight: 600;
      border-bottom: 3px solid var(--primary-deep);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-top: 1rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 1.8rem;
      }
      .mobile-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        flex-direction: column;
        padding: 1.5rem;
        gap: 1.5rem;
      }
      .mobile-menu.open {
        display: flex;
      }
    }