/* roulang page: index */
:root {
      --primary: #0f2937;
      --accent: #10b981;
      --cyan: #06b6d4;
      --bg-dark: #0b1720;
      --text-main: #0f172a;
      --text-muted: #475569;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      color: var(--text-main);
      background-color: #ffffff;
      line-height: 1.75;
    }
    .hero-bg {
      background: linear-gradient(135deg, rgba(15, 41, 55, 0.94) 0%, rgba(11, 23, 32, 0.96) 100%), url('/assets/images/33e67bbd091c00f4.jpg') center/cover no-repeat;
    }
    .dark-panel-bg {
      background: linear-gradient(180deg, #0b1720 0%, #0f2937 100%);
    }
    .card-hover {
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 30px -10px rgba(15, 41, 55, 0.12);
    }
    details > summary::-webkit-details-marker {
      display: none;
    }