/* roulang page: index */
:root {
      --primary: #1E40AF;
      --primary-hover: #1D4ED8;
      --accent: #06B6D4;
      --bg-page: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #475569;
      --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
      --card-hover-shadow: 0 12px 30px -4px rgba(37, 99, 235, 0.12);
    }
    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-page);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .custom-shadow {
      box-shadow: var(--card-shadow);
      transition: all 0.25s ease-in-out;
    }
    .custom-shadow:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-2px);
    }
    .bento-hero-grid {
      display: grid;
      grid-template-columns: repeat(12, 1fr);
      gap: 1.5rem;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .accordion-content.open {
      max-height: 400px;
    }