/* roulang page: index */
:root {
      --primary: hsl(215, 88%, 36%);
      --primary-gradient: linear-gradient(135deg, #1e40af 0%, #3b82f6 50%, #6366f1 100%);
      --accent: #10b981;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-soft: rgba(226, 232, 240, 0.9);
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      color: var(--text-main);
      background-color: #f8fafc;
      overflow-x: hidden;
    }
    .hero-banner {
      background: linear-gradient(rgba(11, 17, 32, 0.88), rgba(15, 23, 42, 0.92)), url('/assets/images/79051c9d3ef9a19e.jpg') center/cover no-repeat;
    }
    .badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      border-radius: 9999px;
      padding: 0.35rem 1rem;
      font-size: 0.875rem;
      font-weight: 500;
      backdrop-filter: blur(8px);
    }
    .card-modern {
      background: var(--bg-card);
      border: 1px solid var(--border-soft);
      border-radius: 1.25rem;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-modern:hover {
      transform: translateY(-4px);
      box-shadow: 0 20px 25px -5px rgba(30, 64, 175, 0.08), 0 8px 10px -6px rgba(30, 64, 175, 0.04);
      border-color: rgba(59, 130, 246, 0.4);
    }
    .tech-gradient-border {
      position: relative;
      border-radius: 1.5rem;
      background: #0f172a;
    }
    .tech-gradient-border::before {
      content: '';
      position: absolute;
      inset: -1px;
      border-radius: 1.55rem;
      padding: 1px;
      background: linear-gradient(135deg, rgba(59,130,246,0.6), rgba(16,185,129,0.3), rgba(99,102,241,0.5));
      -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
      -webkit-mask-composite: xor;
      mask-composite: exclude;
      pointer-events: none;
    }
    .tab-content { display: none; }
    .tab-content.active { display: block; }