/* roulang page: index */
:root {
            --primary: #4f46e5;
            --accent: #06b6d4;
            --dark: #0f172a;
            --surface: #ffffff;
            --text-main: #0f172a;
            --text-muted: #475569;
            --border: #e2e8f0;
        }
        html { scroll-behavior: smooth; font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; }
        .hero-bg {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.94) 0%, rgba(30, 27, 75, 0.88) 100%), url('/assets/images/d24ffcd296fc78b0.webp') center/cover no-repeat;
        }
        .cta-bg {
            background: linear-gradient(rgba(15, 23, 42, 0.92), rgba(15, 23, 42, 0.92)), url('/assets/images/c1d88a3232981919.webp') center/cover no-repeat;
        }
        .glass-card {
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(226, 232, 240, 0.8);
        }
        .glass-card-dark {
            background: rgba(30, 41, 59, 0.7);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(51, 65, 85, 0.8);
        }
        .faq-content {
            transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
        }