/* roulang page: index */
:root {
            --primary: #0F766E;
            --primary-hover: #115E59;
            --accent: #F97316;
            --text-title: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border: #E2E8F0;
            --bg-light: #F8FAFC;
        }
        html { scroll-behavior: smooth; }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-body);
            line-height: 1.7;
            background-color: #FFFFFF;
        }
        .hero-bg {
            background-image: linear-gradient(rgba(15, 23, 42, 0.88), rgba(15, 23, 42, 0.92)), url('/assets/images/3696d5856ef9fafb.webp');
            background-size: cover;
            background-position: center;
        }
        .solution-bg {
            background-image: linear-gradient(rgba(15, 23, 42, 0.94), rgba(15, 23, 42, 0.96)), url('/assets/images/2b58cd5c7e887f66.jpg');
            background-size: cover;
            background-position: center;
        }