/* roulang page: index */
:root {
      --primary-color: #0F52BA;
      --accent-green: #00E676;
      --accent-orange: #FF6D00;
      --text-main: #111827;
      --text-muted: #4B5563;
      --bg-light: #F8F9FA;
      --bg-dark: #0D1117;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      color: var(--text-main);
      background-color: var(--bg-light);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    .font-din {
      font-family: 'DIN Alternate', 'Inter', -apple-system, sans-serif;
    }
    .bg-grid-pattern {
      background-size: 30px 30px;
      background-image: 
        linear-gradient(to right, rgba(15, 82, 186, 0.05) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(15, 82, 186, 0.05) 1px, transparent 1px);
    }
    .bg-grid-dark {
      background-size: 30px 30px;
      background-image: 
        linear-gradient(to right, rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    }
    .text-glow {
      text-shadow: 0 0 15px rgba(0, 230, 118, 0.4);
    }
    .transition-custom {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .blur-nav {
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }