/* roulang page: index */
:root {
      --color-primary: #234B38;
      --color-primary-hover: #1B3B2C;
      --color-dark: #16281F;
      --color-accent: #C39B67;
      --color-bg: #F8F6F0;
      --color-surface: #FFFFFF;
      --color-text: #1E2B24;
      --color-body: #4A5850;
      --color-border: #E3DFD5;
      --shadow-sm: 0 4px 20px -2px rgba(35, 75, 56, 0.06);
      --shadow-lg: 0 12px 30px -4px rgba(35, 75, 56, 0.12);
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      background-color: var(--color-bg);
      color: var(--color-body);
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.8;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, .font-serif-title {
      font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
      color: var(--color-text);
    }
    .card-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: var(--color-accent);
    }
    details summary::-webkit-details-marker {
      display: none;
    }