/* roulang page: index */
:root {
      --brand-orange: #FF4E1B;
      --brand-deep: #1A1A2E;
      --brand-green: #00C897;
      --text-primary: #1F2937;
      --text-secondary: #4B5563;
      --bg-light: #F9FAFB;
      --white: #FFFFFF;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-primary);
      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;
    }
    .container-nav {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    .nav-blur {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    .hero-gradient {
      background: linear-gradient(135deg, #FF4E1B 0%, #FF7B4A 45%, #1A1A2E 100%);
    }
    .card-hover {
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 32px rgba(0,0,0,0.1);
    }
    .btn-primary {
      background: linear-gradient(135deg, #FF4E1B, #E6440F);
      color: white;
      border-radius: 12px;
      padding: 14px 32px;
      font-weight: 600;
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(255,78,27,0.3);
    }
    .btn-primary:hover {
      transform: scale(1.02);
      background: linear-gradient(135deg, #D63E0F, #C5300A);
      box-shadow: 0 8px 20px rgba(255,78,27,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--brand-orange);
      color: var(--brand-orange);
      border-radius: 12px;
      padding: 14px 32px;
      font-weight: 600;
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(255,78,27,0.08);
      border-color: #D63E0F;
      color: #D63E0F;
    }
    .btn-white {
      background: white;
      color: var(--brand-orange);
      border-radius: 12px;
      padding: 14px 32px;
      font-weight: 700;
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    }
    .btn-white:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(0,0,0,0.15);
    }
    .badge-green {
      background-color: var(--brand-green);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 0.3px;
    }
    .section-spacing {
      padding-top: 100px;
      padding-bottom: 100px;
    }
    @media (max-width: 768px) {
      .section-spacing {
        padding-top: 64px;
        padding-bottom: 64px;
      }
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .logo-graphic {
      font-weight: 800;
      font-size: 1.6rem;
      color: var(--brand-orange);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-dot {
      width: 8px;
      height: 8px;
      background: var(--brand-green);
      border-radius: 50%;
      display: inline-block;
    }
    .command-search {
      background: rgba(0,0,0,0.04);
      border-radius: 8px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.9rem;
      color: #6B7280;
      border: 1px solid transparent;
      transition: all 0.2s;
      cursor: pointer;
    }
    .command-search:hover {
      background: white;
      border-color: #E5E7EB;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    .kbd {
      background: #E5E7EB;
      border-radius: 4px;
      padding: 2px 6px;
      font-size: 0.7rem;
      font-weight: 600;
      color: #374151;
      margin-left: 4px;
    }
    .footer-link {
      color: #9CA3AF;
      transition: color 0.2s;
      font-size: 0.9rem;
    }
    .footer-link:hover {
      color: var(--brand-orange);
    }