/* roulang page: index */
:root {
      --primary: #1D4ED8;
      --indigo: #4338CA;
      --cyan: #06B6D4;
      --orange: #F97316;
      --bg-light: #F8FAFC;
      --text-main: #0F172A;
      --text-muted: #334155;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
    }
    body {
      background-color: var(--bg-light);
      color: var(--text-muted);
      overflow-x: hidden;
    }
    .gradient-brand {
      background: linear-gradient(135deg, #1D4ED8 0%, #4338CA 100%);
    }
    .badge-pill {
      display: inline-flex;
      align-items: center;
      padding: 0.25rem 0.85rem;
      border-radius: 9999px;
      font-size: 0.8125rem;
      font-weight: 600;
      border-width: 1px;
    }
    .tech-border-card {
      position: relative;
      background: #FFFFFF;
      border: 1px solid #E2E8F0;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .tech-border-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 35px -10px rgba(29, 78, 216, 0.12);
      border-color: #93C5FD;
    }