/* roulang page: index */
:root {
      --primary-dark: #0F172A;
      --primary-slate: #1E293B;
      --board-dark: #0A0F1D;
      --accent-cyan: #0EA5E9;
      --accent-green: #10B981;
      --bg-light: #F8FAFC;
      --card-white: #FFFFFF;
      --text-muted: #64748B;
      --border-line: #E2E8F0;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      -webkit-font-smoothing: antialiased;
      background-color: var(--bg-light);
      color: #1E293B;
    }
    .hero-mask {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(10, 15, 29, 0.88) 100%);
    }
    .custom-scrollbar::-webkit-scrollbar {
      width: 6px;
      height: 6px;
    }
    .custom-scrollbar::-webkit-scrollbar-thumb {
      background: #CBD5E1;
      border-radius: 4px;
    }
    .custom-scrollbar::-webkit-scrollbar-track {
      background: #F1F5F9;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
    }
    .accordion-active .accordion-content {
      max-height: 400px;
    }
    .accordion-active .accordion-icon {
      transform: rotate(180deg);
    }