/* roulang page: index */
:root {
      --primary: #1A5F5A;
      --primary-hover: #134642;
      --accent: #E07A5F;
      --accent-hover: #cf664b;
      --secondary: #81B29A;
      --dark-slate: #22333B;
      --light-bg: #F9F8F6;
      --surface: #FFFFFF;
      --text-main: #2B2D42;
      --text-muted: #6C757D;
      --border-color: #E5E7EB;
      --shadow-soft: 0 12px 32px -8px rgba(26, 95, 90, 0.08);
      --shadow-hover: 0 20px 40px -10px rgba(26, 95, 90, 0.16);
    }
    
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--light-bg);
      color: var(--text-main);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .glass-nav {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    }

    .card-hover-effect {
      transition: transform 0.28s ease, box-shadow 0.28s ease;
    }
    .card-hover-effect:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .btn-gradient {
      background: linear-gradient(135deg, #1A5F5A 0%, #22333B 100%);
      transition: all 0.25s ease;
    }
    .btn-gradient:hover {
      background: linear-gradient(135deg, #237a74 0%, #2f444e 100%);
      transform: translateY(-1px);
    }

    .btn-accent {
      background: #E07A5F;
      transition: all 0.25s ease;
    }
    .btn-accent:hover {
      background: #cf664b;
      transform: translateY(-1px);
    }

    /* 细致平滑滚动与手风琴样式 */
    html {
      scroll-behavior: smooth;
    }
    details > summary {
      list-style: none;
    }
    details > summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }