/* roulang page: index */
:root {
      --bg-dark: #0A0D14;
      --bg-sec: #101522;
      --card-bg: #161D2F;
      --primary: #00F5A0;
      --cyan: #00D9F5;
      --text-main: #F8FAFC;
      --text-muted: #94A3B8;
      --border-line: rgba(255, 255, 255, 0.08);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: system-ui, -apple-system, 'SF Pro Display', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      line-height: 1.6;
      overflow-x: hidden;
    }
    .grid-bg {
      background-size: 40px 40px;
      background-image: 
        linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    }
    .glow-effect {
      box-shadow: 0 0 35px -5px rgba(0, 245, 160, 0.25);
    }
    .glow-cyan {
      box-shadow: 0 0 30px -5px rgba(0, 217, 245, 0.25);
    }
    .custom-scroll::-webkit-scrollbar {
      width: 6px;
      height: 6px;
    }
    .custom-scroll::-webkit-scrollbar-thumb {
      background: rgba(255, 255, 255, 0.15);
      border-radius: 3px;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }