/* roulang page: index */
:root {
        --primary: #0F172A;
        --accent: #0EA5E9;
        --accent-teal: #06B6D4;
        --bg-light: #F8FAFC;
        --text-main: #0F172A;
        --text-muted: #475569;
      }
      html {
        scroll-behavior: smooth;
        font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      }
      .hero-bg {
        background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(2, 6, 23, 0.88) 100%), url('/assets/images/432b17e470d7e60e.webp') center/cover no-repeat;
      }
      .glass-nav {
        backdrop-filter: blur(12px);
        background-color: rgba(255, 255, 255, 0.92);
      }
      .card-hover {
        transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      }
      .card-hover:hover {
        transform: translateY(-6px);
        box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
      }
      .tab-active {
        border-color: #0EA5E9;
        color: #0EA5E9;
        background-color: rgba(14, 165, 233, 0.08);
      }