/* roulang page: index */
:root {
      --primary: #1A1A2E;
      --secondary: #E94560;
      --gradient-brand: linear-gradient(135deg, #1A1A2E 0%, #16213E 50%, #E94560 100%);
      --bg: #F8F9FA;
      --card-bg: #FFFFFF;
      --text-main: #1A1A2E;
      --text-body: #4A4A6A;
      --text-muted: #6B7280;
      --accent: #E94560;
      --border: #E5E7EB;
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-btn: 10px;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-lg: 0 18px 35px rgba(0,0,0,0.07);
      --font-sans: 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    @media (min-width: 768px) {
      .container-custom {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    .glass-nav {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }
    .btn-primary {
      background-color: var(--secondary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.75rem 1.8rem;
      font-weight: 600;
      transition: all 0.25s ease;
      box-shadow: 0 4px 10px rgba(233,69,96,0.25);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      background-color: #C81E3A;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(233,69,96,0.35);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 0.7rem 1.8rem;
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
    }
    .btn-outline:hover {
      background-color: var(--primary);
      color: white;
    }
    .card-hover {
      transition: all 0.3s ease;
      background: var(--card-bg);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border);
    }
    .card-hover:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
    }
    .badge-accent {
      background-color: var(--secondary);
      color: white;
      border-radius: 30px;
      padding: 0.2rem 0.9rem;
      font-size: 0.8rem;
      font-weight: 600;
      letter-spacing: 0.4px;
    }
    .section-spacing {
      padding: 5rem 0;
    }
    @media (max-width: 768px) {
      .section-spacing {
        padding: 3.5rem 0;
      }
    }
    .h1-style {
      font-size: 3.4rem;
      font-weight: 800;
      line-height: 1.15;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .h2-style {
      font-size: 2.4rem;
      font-weight: 700;
      line-height: 1.25;
      color: var(--text-main);
    }
    @media (max-width: 768px) {
      .h1-style { font-size: 2.4rem; }
      .h2-style { font-size: 1.9rem; }
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-body);
      transition: color 0.2s;
      padding: 0.5rem 0.2rem;
      border-bottom: 2px solid transparent;
    }
    .nav-link:hover {
      color: var(--secondary);
      border-bottom-color: var(--secondary);
    }
    .mobile-menu {
      display: none;
    }
    @media (max-width: 767px) {
      .desktop-nav { display: none; }
      .mobile-menu { display: block; }
    }
    .pricing-recommended {
      border: 2px solid var(--secondary);
      box-shadow: 0 18px 35px rgba(233,69,96,0.12);
    }
    details summary {
      list-style: none;
      cursor: pointer;
      font-weight: 600;
      color: var(--text-main);
      padding: 1rem 0;
      border-bottom: 1px solid var(--border);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    .faq-answer {
      padding: 0.8rem 0 1.5rem;
      color: var(--text-body);
    }