/* roulang page: index */
:root {
      --primary-color: #1E6091;
      --primary-light: #0A84FF;
      --accent-cyan: #00B4D8;
      --dark-navy: #0B132B;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --bg-base: #F8FAFC;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', Roboto, sans-serif;
    }
    body {
      background-color: var(--bg-base);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .custom-shadow-card {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.02);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .custom-shadow-card:hover {
      box-shadow: 0 20px 30px -10px rgba(30, 96, 145, 0.12), 0 8px 16px -4px rgba(15, 23, 42, 0.04);
      transform: translateY(-4px);
    }
    .glass-nav {
      background: rgba(255, 255, 255, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .dark-grid-pattern {
      background-color: #0B132B;
      background-image: radial-gradient(rgba(0, 180, 216, 0.15) 1px, transparent 0);
      background-size: 24px 24px;
    }