/* roulang page: index */
:root {
      --brand-gradient: linear-gradient(135deg, #FF5E1E 0%, #FF3838 100%);
      --tech-dark: #0F172A;
      --bg-light: #F8FAFC;
      --card-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
      --hover-shadow: 0 25px 35px -5px rgba(255, 94, 30, 0.12), 0 10px 15px -5px rgba(0, 0, 0, 0.04);
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: #334155;
      line-height: 1.6;
    }
    .gradient-brand {
      background: var(--brand-gradient);
    }
    .text-gradient {
      background: var(--brand-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .card-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--hover-shadow);
    }
    .badge-blur {
      backdrop-filter: blur(8px);
      background: rgba(255, 255, 255, 0.88);
    }
    /* 手风琴平滑动效 */
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-item.active .accordion-content {
      max-height: 400px;
    }
    .accordion-item.active .accordion-icon {
      transform: rotate(180deg);
    }