/* roulang page: index */
:root {
      --primary: #0F2926;
      --primary-dark: #0A1C1A;
      --primary-mid: #1D4A43;
      --accent: #C5A880;
      --accent-hover: #B5966B;
      --bg-surface: #F8F9FA;
      --text-main: #1A202C;
      --text-muted: #4A5568;
      --border-color: #E2E8F0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
      line-height: 1.75;
      overflow-x: hidden;
    }
    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(10, 28, 26, 0.92) 0%, rgba(15, 41, 38, 0.85) 60%, rgba(29, 74, 67, 0.78) 100%);
    }
    .nav-blur {
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .card-hover {
      transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s ease;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 30px -10px rgba(15, 41, 38, 0.12);
    }