/* roulang page: index */
:root {
      --primary-color: #1e40af;
      --primary-hover: #1d4ed8;
      --accent-color: #0284c7;
      --text-main: #0f172a;
      --text-muted: #475569;
      --bg-page: #f8fafc;
      --card-border: #e2e8f0;
    }
    html {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Noto Sans", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: var(--bg-page);
      color: var(--text-main);
      overflow-x: hidden;
      min-width: 375px;
    }
    .hero-gradient {
      background: radial-gradient(circle at 75% 25%, rgba(37, 99, 235, 0.12) 0%, rgba(248, 250, 252, 0) 65%),
                  linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
    }
    .glass-nav {
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    .card-transition {
      transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-transition:hover {
      transform: translateY(-5px);
      box-shadow: 0 16px 32px -8px rgba(15, 23, 42, 0.08), 0 4px 12px -2px rgba(15, 23, 42, 0.03);
    }
    .faq-item summary::-webkit-details-marker {
      display: none;
    }
    .faq-item[open] summary svg {
      transform: rotate(180deg);
    }
    .badge-glow {
      box-shadow: 0 0 12px rgba(37, 99, 235, 0.25);
    }