/* roulang page: index */
:root {
      --brand-primary: #00D084;
      --brand-dark: #0B0D10;
      --text-main: #1E293B;
      --text-muted: #64748B;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      color: var(--text-main);
      background-color: #F8FAFC;
      line-height: 1.75;
      font-family: system-ui, -apple-system, PingFang SC, "Microsoft YaHei", sans-serif;
    }
    .text-balance-tight {
      letter-spacing: -0.02em;
    }
    .glow-brand {
      box-shadow: 0 0 25px rgba(0, 208, 132, 0.28);
    }
    .hero-mask {
      background: linear-gradient(180deg, rgba(11, 13, 16, 0.82) 0%, rgba(11, 13, 16, 0.94) 100%);
    }
    .tech-border {
      border: 1px solid rgba(255, 255, 255, 0.08);
    }
    .glass-dark {
      background: rgba(18, 22, 29, 0.85);
      backdrop-filter: blur(12px);
    }
    /* 手风琴平滑展开微样式 */
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary .faq-icon {
      transform: rotate(180deg);
      color: #00D084;
    }