/* roulang page: index */
:root {
      --primary: #0284C7;
      --primary-dark: #0F172A;
      --accent-cyan: #06B6D4;
      --accent-emerald: #10B981;
      --bg-base: #F8FAFC;
      --card-bg: #FFFFFF;
      --border-color: #E2E8F0;
      --text-main: #0F172A;
      --text-muted: #64748B;
    }
    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Segoe UI", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      overflow-x: hidden;
      line-height: 1.6;
    }
    .hero-glow {
      background: radial-gradient(circle at 50% 30%, rgba(6, 182, 212, 0.15), transparent 70%);
    }
    .cyber-border {
      border: 1px solid rgba(226, 232, 240, 0.8);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .cyber-border:hover {
      border-color: rgba(6, 182, 212, 0.5);
      box-shadow: 0 10px 25px -5px rgba(2, 132, 199, 0.12), 0 8px 10px -6px rgba(2, 132, 199, 0.08);
      transform: translateY(-2px);
    }
    .dark-card-glow {
      background: linear-gradient(145deg, #131d35 0%, #0a0f1d 100%);
      border: 1px solid rgba(56, 189, 248, 0.18);
    }
    .dark-card-glow:hover {
      border-color: rgba(56, 189, 248, 0.45);
      box-shadow: 0 0 25px rgba(6, 182, 212, 0.15);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-active .accordion-content {
      max-height: 250px;
    }
    .accordion-active .accordion-icon {
      transform: rotate(180deg);
    }