/* roulang page: index */
:root {
      --color-navy: #0F2537;
      --color-dark: #0B1926;
      --color-cyan: #0D7A75;
      --color-blue: #1E4E79;
      --color-gold: #C58B39;
      --color-bg: #F8FAFC;
      --color-text: #334155;
      --color-muted: #64748B;
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans CN", sans-serif;
    }
    body {
      font-family: var(--font-stack);
      color: var(--color-text);
      background-color: var(--color-bg);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    .custom-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 37, 55, 0.06);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-shadow:hover {
      box-shadow: 0 12px 28px -4px rgba(15, 37, 55, 0.14);
      transform: translateY(-3px);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-content.active {
      max-height: 380px;
    }
    html {
      scroll-behavior: smooth;
    }