/* roulang page: index */
:root {
            --brand-gradient: linear-gradient(135deg, #0F2B48 0%, #1A5F7A 100%);
            --accent-gold: #D4AF37;
            --slate-night: #0B192C;
            --card-shadow: 0 10px 30px -10px rgba(15, 43, 72, 0.08);
            --card-shadow-hover: 0 20px 35px -10px rgba(15, 43, 72, 0.16);
        }
        html { scroll-behavior: smooth; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; }
        .bg-brand-grad { background: var(--brand-gradient); }
        .card-custom {
            box-shadow: var(--card-shadow);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .card-custom:hover {
            transform: translateY(-6px);
            box-shadow: var(--card-shadow-hover);
        }
        .coupon-mask {
            mask-image: radial-gradient(circle at 0.5rem 50%, transparent 0.5rem, white 0.55rem);
        }
        .active-tab {
            border-color: #1A5F7A;
            color: #1A5F7A;
            background-color: #F1F5F9;
        }