/* roulang page: index */
:root {
      --primary: #6C2BD9;
      --primary-dark: #4B1E9A;
      --accent: #F59E0B;
      --accent-light: #FCD34D;
      --deep: #1E1B4B;
      --soft: #F8F7FF;
      --muted: #6B7280;
      --card: #FFFFFF;
      --success: #10B981;
      --border: #E5E7EB;
      --radius-xl: 16px;
      --radius-2xl: 24px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.02);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --gradient-brand: linear-gradient(135deg, #6C2BD9 0%, #F59E0B 100%);
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
      background-color: var(--soft);
      color: #374151;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .container-main {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 16px;
      padding-right: 16px;
    }
    @media (min-width: 768px) {
      .container-main {
        padding-left: 32px;
        padding-right: 32px;
      }
    }
    @media (min-width: 1024px) {
      .container-main {
        padding-left: 40px;
        padding-right: 40px;
      }
    }
    .section-spacing {
      padding-top: 80px;
      padding-bottom: 80px;
    }
    @media (min-width: 1024px) {
      .section-spacing {
        padding-top: 120px;
        padding-bottom: 120px;
      }
    }
    .nav-blur {
      backdrop-filter: blur(12px);
      background-color: rgba(255,255,255,0.85);
    }
    .mobile-bottom-nav {
      display: flex;
    }
    @media (min-width: 768px) {
      .mobile-bottom-nav {
        display: none;
      }
    }
    .desktop-nav {
      display: none;
    }
    @media (min-width: 768px) {
      .desktop-nav {
        display: flex;
      }
    }
    .gradient-text {
      background: linear-gradient(135deg, #6C2BD9 0%, #F59E0B 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-background {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-overlay {
      background: linear-gradient(135deg, rgba(30,27,75,0.85) 0%, rgba(108,43,217,0.7) 100%);
      position: absolute;
      inset: 0;
    }
    .card-hover:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-top: 16px;
      padding-bottom: 8px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .focus-ring:focus-visible {
      outline: 2px solid var(--primary);
      outline-offset: 2px;
    }
    .btn-primary {
      background: var(--gradient-brand);
      color: white;
      font-weight: 600;
      border-radius: 12px;
      padding: 14px 32px;
      transition: all 0.25s;
      box-shadow: 0 4px 12px rgba(108,43,217,0.25);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      box-shadow: 0 0 20px rgba(108,43,217,0.5);
      transform: scale(1.02);
      background: linear-gradient(150deg, #6C2BD9 0%, #F59E0B 100%);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      border-radius: 12px;
      padding: 14px 32px;
      transition: all 0.25s;
    }
    .btn-outline:hover {
      background: rgba(108,43,217,0.08);
    }
    .stat-number {
      font-family: 'Inter', sans-serif;
      font-weight: 800;
    }
    input, textarea {
      border: 1px solid var(--border);
      border-radius: 8px;
      padding: 12px 16px;
      width: 100%;
      transition: border 0.2s, box-shadow 0.2s;
    }
    input:focus, textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(108,43,217,0.15);
      outline: none;
    }
    .hamburger-menu {
      display: block;
    }
    @media (min-width: 768px) {
      .hamburger-menu {
        display: none;
      }
    }
    #mobileMenu {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: white;
      position: absolute;
      top: 72px;
      left: 0;
      right: 0;
      box-shadow: 0 8px 20px rgba(0,0,0,0.1);
    }
    #mobileMenu.open {
      max-height: 400px;
    }