/* roulang page: index */
:root {
      --primary: #0C7A6D;
      --primary-dark: #08584E;
      --secondary: #1E9E8C;
      --accent: #E87A5D;
      --bg-light: #F4F8F7;
      --text-dark: #111E25;
      --border-line: #E2ECE9;
    }
    body {
      color: #1f2937;
      background-color: #ffffff;
      line-height: 1.75;
      letter-spacing: 0.02em;
    }
    .custom-shadow {
      box-shadow: 0 4px 20px -2px rgba(12, 122, 109, 0.06);
    }
    .custom-shadow-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-shadow-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px -4px rgba(12, 122, 109, 0.14);
    }
    .hero-bg {
      background-image: linear-gradient(to bottom, rgba(17, 30, 37, 0.78), rgba(12, 122, 109, 0.88)), url('/assets/images/fd9cb4632636300e.webp');
      background-size: cover;
      background-position: center;
    }
    .concept-bg {
      background-image: linear-gradient(135deg, rgba(17, 30, 37, 0.95), rgba(12, 122, 109, 0.92)), url('/assets/images/3f7df6df29264d11.webp');
      background-size: cover;
      background-position: center;
    }
    .faq-collapse {
      transition: max-height 0.35s ease-out, opacity 0.25s ease-in-out;
    }