/* roulang page: index */
:root {
      --color-primary: #0B0F19;
      --color-accent-green: #10B981;
      --color-accent-orange: #F97316;
      --color-bg-light: #F8FAFC;
      --color-text-main: #1E293B;
      --color-text-muted: #64748B;
      --color-border: #E2E8F0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      color: var(--color-text-main);
      background-color: var(--color-bg-light);
      -webkit-font-smoothing: antialiased;
    }
    .hero-bg-overlay {
      background: linear-gradient(135deg, rgba(11, 15, 25, 0.94) 0%, rgba(17, 24, 39, 0.88) 100%);
    }
    .custom-gradient-btn {
      background: linear-gradient(135deg, #10B981 0%, #059669 100%);
    }
    .custom-gradient-btn:hover {
      background: linear-gradient(135deg, #059669 0%, #047857 100%);
    }
    .tab-content {
      display: none;
    }
    .tab-content.active {
      display: block;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease-out;
    }
    .faq-answer.open {
      max-height: 240px;
    }