/* roulang page: index */
:root {
      --primary-gradient: linear-gradient(135deg, #1d4ed8 0%, #4338ca 50%, #312e81 100%);
      --accent-green: #10b981;
      --card-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --card-hover-shadow: 0 25px 50px -12px rgba(30, 58, 138, 0.22);
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      color: #1e293b;
      background-color: #f8fafc;
    }
    .custom-gradient {
      background: var(--primary-gradient);
    }
    .card-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-hover-shadow);
    }
    /* 首屏堆叠卡片视差层次 */
    .stack-hero-container {
      position: relative;
    }
    .stack-card-center {
      z-index: 20;
    }
    .stack-card-left {
      z-index: 10;
      transform: rotate(-3deg) translateY(12px);
    }
    .stack-card-right {
      z-index: 10;
      transform: rotate(3deg) translateY(12px);
    }
    @media (max-width: 1024px) {
      .stack-card-left, .stack-card-right {
        transform: none !important;
      }
    }