/* roulang page: index */
:root {
      --primary: #0052FF;
      --primary-hover: #003ECC;
      --secondary: #10B981;
      --accent: #FF5722;
      --dark: #0F172A;
      --dark-card: #1E293B;
      --light-bg: #F8FAFC;
      --border-color: #E2E8F0;
      --text-main: #0F172A;
      --text-muted: #475569;
    }
    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: #FFFFFF;
      color: var(--text-main);
      line-height: 1.75;
      overflow-x: hidden;
    }
    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(0, 82, 255, 0.82) 100%);
    }
    .carbon-mesh {
      background-color: var(--dark);
      background-image: radial-gradient(rgba(16, 185, 129, 0.15) 1px, transparent 0);
      background-size: 24px 24px;
    }
    .card-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-shadow:hover {
      box-shadow: 0 16px 32px -4px rgba(0, 82, 255, 0.12), 0 6px 12px -2px rgba(15, 23, 42, 0.08);
      transform: translateY(-4px);
    }
    .bento-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 1.25rem;
      transition: all 0.3s ease;
    }
    .bento-card:hover {
      border-color: #93C5FD;
      box-shadow: 0 12px 28px -6px rgba(0, 82, 255, 0.1);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .accordion-content.open {
      max-height: 300px;
    }