/* roulang page: index */
:root {
      --primary: #0F2744;
      --primary-hover: #1E3A8A;
      --accent: #0D9488;
      --bg-light: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #475569;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: #FFFFFF;
    }
    .custom-gradient-bg {
      background: linear-gradient(135deg, #0F2744 0%, #1E3A8A 50%, #0B132B 100%);
    }
    .hero-glow {
      position: absolute;
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(37,99,235,0.15) 0%, rgba(13,148,136,0.05) 50%, transparent 70%);
      top: -100px;
      right: -100px;
      pointer-events: none;
    }
    .card-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(15, 39, 68, 0.1), 0 10px 10px -5px rgba(15, 39, 68, 0.04);
    }
    .faq-answer {
      transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
    }