/* roulang page: index */
:root {
      --brand-primary: #0d9488;
      --brand-primary-dark: #0f766e;
      --brand-gradient: linear-gradient(135deg, #0d9488 0%, #059669 100%);
      --brand-accent: #f97316;
      --brand-dark: #0f172a;
      --brand-slate: #1e293b;
      --bg-light: #f8fafc;
      --text-main: #0f172a;
      --text-muted: #475569;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    }
    body {
      background-color: var(--bg-light);
      color: var(--text-main);
      overflow-x: hidden;
    }
    .hero-gradient {
      background: linear-gradient(135deg, #0f172a 0%, #115e59 60%, #064e3b 100%);
    }
    .card-shadow {
      box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.02);
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .card-shadow:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 28px -4px rgba(13, 148, 136, 0.12), 0 4px 12px -2px rgba(15, 23, 42, 0.06);
    }
    .code-glow {
      box-shadow: 0 0 25px rgba(13, 148, 136, 0.25);
    }
    .badge-primary {
      background-color: #f0fdf4;
      color: #15803d;
      border: 1px solid #bbf7d0;
    }
    .tab-active {
      background: var(--brand-gradient);
      color: #ffffff;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .faq-answer.open {
      max-height: 300px;
    }