/* roulang page: index */
:root {
      --brand-dark: #1E2F2B;
      --brand-gold: #D49B3B;
      --brand-gold-dark: #B87D2A;
      --brand-light: #F8F7F4;
      --brand-emerald: #2A9D8F;
      --text-body: #3A3A3A;
      --text-weak: #6B6B6B;
      --card-radius: 1rem;
      --btn-radius: 9999px;
      --shadow-card: 0 10px 25px -5px rgba(0,0,0,0.05), 0 8px 10px -6px rgba(0,0,0,0.02);
      --shadow-card-hover: 0 20px 30px -10px rgba(0,0,0,0.1), 0 10px 15px -6px rgba(0,0,0,0.05);
    }
    * {
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: #F8F7F4;
      color: #3A3A3A;
      line-height: 1.6;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a, button {
      transition: all 0.2s ease;
    }
    .nav-capsule {
      background: rgba(30, 47, 43, 0.85);
      backdrop-filter: blur(12px);
      border-radius: 9999px;
      max-width: 56rem;
      margin-left: auto;
      margin-right: auto;
      padding: 0.5rem 1.5rem;
      box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    }
    .nav-link {
      color: white;
      font-weight: 500;
      padding: 0.5rem 1rem;
      border-radius: 9999px;
      transition: 0.2s;
    }
    .nav-link:hover {
      color: #D49B3B;
      background: rgba(255,255,255,0.1);
    }
    .btn-primary {
      background-color: #D49B3B;
      color: white;
      border-radius: 9999px;
      padding: 0.75rem 2rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: 0.2s;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 10px rgba(212,155,59,0.3);
    }
    .btn-primary:hover {
      background-color: #B87D2A;
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(184,125,42,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      border-radius: 9999px;
      padding: 0.75rem 2rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: 0.2s;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
      transform: translateY(-2px);
    }
    .service-card {
      background: white;
      border-radius: 1rem;
      box-shadow: var(--shadow-card);
      transition: 0.3s ease;
      overflow: hidden;
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-card-hover);
    }
    .service-card.featured {
      transform: scale(1.05);
      border: 2px solid rgba(212,155,59,0.35);
      box-shadow: 0 15px 30px rgba(0,0,0,0.08);
      position: relative;
      z-index: 2;
    }
    .service-card.featured:hover {
      transform: scale(1.05) translateY(-8px);
    }
    .service-img {
      height: 200px;
      object-fit: cover;
      width: 100%;
      background: #e2e8f0;
    }
    .arrow-link {
      display: inline-flex;
      align-items: center;
      color: #2A9D8F;
      font-weight: 600;
      transition: 0.2s;
    }
    .arrow-link i {
      margin-left: 4px;
      transition: 0.2s;
    }
    .arrow-link:hover i {
      transform: translateX(4px);
    }
    .stat-number {
      font-family: "Inter", "Segoe UI", sans-serif;
      font-weight: 800;
      color: #D49B3B;
      font-size: 2.5rem;
    }
    .case-tag {
      border: 1px solid #D49B3B;
      color: #D49B3B;
      border-radius: 9999px;
      padding: 0.25rem 1rem;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      background: rgba(212,155,59,0.08);
    }
    .solution-card {
      background: white;
      border-radius: 1rem;
      padding: 1.5rem;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
      display: flex;
      align-items: center;
      gap: 1.5rem;
    }
    .solution-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-card-hover);
    }
    .solution-icon {
      width: 80px;
      height: 80px;
      border-radius: 50%;
      background: rgba(42,157,143,0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      transition: 0.3s;
      flex-shrink: 0;
    }
    .solution-card:hover .solution-icon {
      background: #1E2F2B;
      color: white;
    }
    .faq-item {
      border-bottom: 1px solid #e5e7eb;
    }
    .faq-question {
      background: white;
      padding: 1.2rem 0.5rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: 0.2s;
      color: #1E2F2B;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      padding: 0 0.5rem;
      color: #4a4a4a;
    }
    .faq-item.active .faq-answer {
      max-height: 150px;
      padding: 0.8rem 0.5rem;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }
    footer a:hover {
      color: #D49B3B;
    }
    @media (max-width: 768px) {
      .nav-capsule {
        border-radius: 2rem;
        max-width: 95%;
        padding: 0.5rem 1rem;
      }
      .service-card.featured {
        transform: none;
        border: 1px solid rgba(212,155,59,0.3);
      }
      .service-card.featured:hover {
        transform: translateY(-8px);
      }
      .solution-card {
        flex-direction: column;
        text-align: center;
      }
    }
    .mobile-menu {
      display: none;
    }
    #menu-toggle:checked ~ .mobile-menu {
      display: flex;
      flex-direction: column;
      position: absolute;
      top: 70px;
      left: 20px;
      right: 20px;
      background: rgba(30,47,43,0.95);
      backdrop-filter: blur(15px);
      border-radius: 2rem;
      padding: 1.5rem;
      z-index: 50;
    }