/* roulang page: index */
:root {
      --primary: #00E599;
      --primary-hover: #00c784;
      --accent: #00C2FF;
      --dark-bg: #0B0F17;
      --card-dark: #131B2B;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius: 12px;
      --shadow-soft: 0 10px 30px -5px rgba(15, 23, 42, 0.05);
      --shadow-hover: 0 20px 40px -10px rgba(0, 229, 153, 0.15);
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #F8FAFC;
      overflow-x: hidden;
    }

    .font-mono-data {
      font-family: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;
    }

    .glass-nav {
      background: rgba(11, 15, 23, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }

    .bounding-box {
      border: 1.5px solid var(--primary);
      position: relative;
      background: rgba(0, 229, 153, 0.05);
    }

    .bounding-tag {
      position: absolute;
      top: -10px;
      left: -1px;
      background: var(--primary);
      color: #0B0F17;
      font-size: 10px;
      font-weight: 700;
      padding: 1px 5px;
      border-radius: 2px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .btn-neon {
      background-color: var(--primary);
      color: #0B0F17;
      transition: all 0.25s ease;
      font-weight: 600;
    }
    .btn-neon:hover {
      background-color: #00ffaa;
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(0, 229, 153, 0.35);
    }

    .feature-card {
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      border: 1px solid rgba(226, 232, 240, 0.8);
    }
    .feature-card:hover {
      border-color: rgba(0, 229, 153, 0.5);
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out, padding 0.3s ease;
    }
    .faq-item.active .faq-content {
      max-height: 250px;
      padding-top: 1rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(180deg);
      color: var(--primary);
    }

    .custom-scrollbar::-webkit-scrollbar {
      height: 6px;
      width: 6px;
    }
    .custom-scrollbar::-webkit-scrollbar-thumb {
      background: #334155;
      border-radius: 4px;
    }