/* roulang page: index */
:root {
      --primary: #1E40AF;
      --primary-hover: #1D4ED8;
      --accent: #0284C7;
      --accent-soft: #E0F2FE;
      --bg-page: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #475569;
      --border-color: #E2E8F0;
      --radius-default: 1rem;
      --shadow-default: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
    }
    * {
      box-sizing: border-box;
      scroll-behavior: smooth;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.75;
      background-color: var(--bg-page);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .custom-container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }
    .hover-card {
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .hover-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 32px -4px rgba(14, 165, 233, 0.12), 0 8px 16px -4px rgba(15, 23, 42, 0.06);
    }
    .text-gradient {
      background: linear-gradient(135deg, #1E40AF 0%, #0284C7 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .bg-grid-pattern {
      background-image: radial-gradient(rgba(30, 64, 175, 0.08) 1px, transparent 1px);
      background-size: 24px 24px;
    }
    .hero-glow {
      position: absolute;
      top: -100px;
      right: -100px;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(2, 132, 199, 0.15) 0%, rgba(248, 250, 252, 0) 70%);
      filter: blur(40px);
      pointer-events: none;
      z-index: 0;
    }
    details summary::-webkit-details-marker {
      display: none;
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }