/* roulang page: index */
:root {
      --primary-blue: #1d4ed8;
      --accent-energy: #f97316;
      --accent-tech: #0ea5e9;
      --bg-light: #f8fafc;
      --text-dark: #0f172a;
      --border-color: #e2e8f0;
    }
    body {
      color: #334155;
      background-color: var(--bg-light);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      overflow-x: hidden;
    }
    .hero-glow {
      background: radial-gradient(circle at 50% 30%, rgba(29, 78, 216, 0.18) 0%, rgba(15, 23, 42, 0.95) 75%);
    }
    details[open] summary svg {
      transform: rotate(180deg);
    }