/* roulang page: index */
:root {
      --primary: #00E599;
      --primary-dark: #0bb57a;
      --bg-dark: #0F141C;
      --card-bg: #1A202C;
      --accent-orange: #FF5722;
      --text-main: #FFFFFF;
      --text-muted: #94A3B8;
      --border-color: rgba(255,255,255,0.08);
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      line-height: 1.65;
      background-color: #0F141C;
      color: #E2E8F0;
    }
    .custom-container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }
    .badge-glow {
      box-shadow: 0 0 15px rgba(0, 229, 153, 0.25);
    }
    .tech-card {
      background: #1A202C;
      border: 1px solid rgba(255,255,255,0.08);
      transition: all 0.25s ease-in-out;
    }
    .tech-card:hover {
      border-color: rgba(0, 229, 153, 0.4);
      transform: translateY(-2px);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
    }
    .accordion-content.open {
      max-height: 500px;
    }