/* roulang page: index */
:root {
      --color-brand: #0F2C24;
      --color-brand-light: #1B473B;
      --color-brand-accent: #C59B27;
      --color-bg-light: #F8F9FA;
      --color-text-main: #1A1A1A;
      --color-text-muted: #5A626A;
      --color-border: #E5E7EB;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--color-text-main);
      background-color: var(--color-bg-light);
      letter-spacing: -0.01em;
      line-height: 1.65;
    }
    .custom-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 44, 36, 0.05);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .custom-shadow:hover {
      box-shadow: 0 12px 28px -4px rgba(15, 44, 36, 0.12);
      transform: translateY(-4px);
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }