/* roulang page: index */
:root {
      --bg-deep: #0B0F19;
      --blue-electric: #0057FF;
      --titanium: #B0C4DE;
      --orange-energy: #FF4D00;
      --card-bg: rgba(255, 255, 255, 0.03);
      --card-border: rgba(255, 255, 255, 0.08);
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-xl: 24px;
      --font-inter: 'Inter', system-ui, -apple-system, sans-serif;
      --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-inter), var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--titanium);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, .btn {
      cursor: pointer;
      border: none;
      background: transparent;
      font-family: inherit;
    }
    .glass-card {
      background: rgba(255, 255, 255, 0.03);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      border-color: rgba(0, 87, 255, 0.5);
      box-shadow: 0 8px 32px rgba(0, 87, 255, 0.15);
      transform: translateY(-4px);
    }
    .glow-btn-blue {
      background-color: var(--blue-electric);
      color: white;
      border-radius: var(--radius-md);
      font-weight: 600;
      padding: 0.75rem 1.75rem;
      box-shadow: 0 0 15px rgba(0, 87, 255, 0.6);
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      letter-spacing: 0.02em;
    }
    .glow-btn-blue:hover {
      box-shadow: 0 0 25px rgba(0, 87, 255, 0.9);
      background-color: #0047cc;
      transform: translateY(-2px);
    }
    .glow-btn-orange {
      background-color: var(--orange-energy);
      color: white;
      border-radius: var(--radius-md);
      font-weight: 600;
      padding: 0.75rem 1.75rem;
      box-shadow: 0 0 15px rgba(255, 77, 0, 0.5);
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
    }
    .glow-btn-orange:hover {
      box-shadow: 0 0 28px rgba(255, 77, 0, 0.8);
      background-color: #e64400;
      transform: translateY(-2px);
    }
    .nav-pill {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.06);
      border-radius: 40px;
      padding: 0.5rem 1.5rem;
      display: flex;
      align-items: center;
      gap: 1.5rem;
      transition: all 0.2s;
    }
    .nav-pill a {
      font-weight: 500;
      font-size: 0.9rem;
      color: #B0C4DE;
      transition: color 0.2s;
      display: flex;
      align-items: center;
      gap: 0.3rem;
    }
    .nav-pill a:hover {
      color: white;
    }
    .stat-number {
      font-family: var(--font-inter);
      font-weight: 800;
      background: linear-gradient(to right, #ffffff, #a0c0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: all 0.25s;
    }
    .faq-question {
      cursor: pointer;
      font-weight: 600;
      color: white;
      padding: 1.25rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s;
      color: #B0C4DE;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.25rem;
    }
    .faq-item.active .faq-question {
      color: var(--blue-electric);
    }
    .icon-plus {
      transition: transform 0.3s ease;
      font-size: 1.4rem;
      font-weight: 300;
    }
    .faq-item.active .icon-plus {
      transform: rotate(45deg);
    }
    @media (max-width: 768px) {
      .nav-pill {
        gap: 0.8rem;
        padding: 0.4rem 1rem;
      }
      .nav-pill a span {
        display: none;
      }
      .nav-pill a i {
        font-size: 1.25rem;
      }
      h1 {
        font-size: 2.5rem !important;
      }
      h2 {
        font-size: 2rem !important;
      }
    }
    .bg-grid {
      background-image: radial-gradient(rgba(255,255,255,0.03) 1px, transparent 1px);
      background-size: 30px 30px;
    }
    .hero-visual-card {
      background: rgba(255,255,255,0.02);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 28px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    }
    .footer-link {
      color: #B0C4DE;
      transition: color 0.2s;
    }
    .footer-link:hover {
      color: var(--blue-electric);
    }
    .text-glow {
      text-shadow: 0 0 8px rgba(0,87,255,0.4);
    }