/* roulang page: index */
:root {
      --color-primary: #0F766E;
      --color-primary-light: #10B981;
      --color-accent: #6366F1;
      --color-dark: #090D16;
      --color-bg-subtle: #F8FAFC;
      --color-border: #E2E8F0;
      --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    html {
      scroll-behavior: smooth;
      font-family: var(--font-stack);
      letter-spacing: 0.015em;
    }
    body {
      background-color: #FFFFFF;
      color: #334155;
      overflow-x: hidden;
      line-height: 1.75;
    }
    .custom-container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }
    .code-grid-bg {
      background-color: #090D16;
      background-image: radial-gradient(rgba(16, 185, 129, 0.12) 1px, transparent 1px);
      background-size: 24px 24px;
    }
    .hero-glow {
      box-shadow: 0 20px 50px -15px rgba(15, 118, 110, 0.25);
    }
    .card-transition {
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .card-transition:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px -8px rgba(15, 23, 42, 0.08);
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }