/* roulang page: index */
:root {
      --primary: #0F52BA;
      --primary-dark: #0A3A85;
      --primary-light: #EBF2FD;
      --accent: #00D084;
      --accent-dark: #00A669;
      --bg-light: #F8FAFC;
      --bg-dark: #0B132B;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
    }
    
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    }

    body {
      color: var(--text-body);
      background-color: #FFFFFF;
      line-height: 1.75;
      overflow-x: hidden;
    }

    .glass-nav {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }

    .badge-glow {
      box-shadow: 0 0 15px rgba(0, 208, 132, 0.35);
    }

    .card-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    .card-shadow:hover {
      box-shadow: 0 12px 28px -4px rgba(15, 82, 186, 0.12);
      transform: translateY(-3px);
    }

    .hero-gradient-overlay {
      background: linear-gradient(135deg, rgba(11, 19, 43, 0.92) 0%, rgba(15, 82, 186, 0.85) 60%, rgba(11, 19, 43, 0.95) 100%);
    }

    .data-stream-bg {
      background-color: var(--bg-dark);
      background-image: radial-gradient(#1e293b 1px, transparent 1px);
      background-size: 24px 24px;
    }

    .timeline-line::before {
      content: '';
      position: absolute;
      top: 0;
      bottom: 0;
      left: 50%;
      width: 2px;
      background-color: #E2E8F0;
      transform: translateX(-50%);
    }
    @media (max-width: 768px) {
      .timeline-line::before {
        left: 20px;
      }
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
    }