/* roulang page: index */
:root {
            --primary: #0d9488;
            --primary-dark: #0f766e;
            --accent: #f59e0b;
            --bg-dark: #020617;
            --bg-card: #0f172a;
            --text-main: #0f172a;
            --text-muted: #64748b;
        }
        html { scroll-behavior: smooth; }
        body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; }
        .hero-bg-overlay {
            background: linear-gradient(135deg, rgba(2, 6, 23, 0.94) 0%, rgba(15, 23, 42, 0.88) 60%, rgba(13, 148, 136, 0.75) 100%);
        }
        .coupon-mask {
            background: radial-gradient(circle at 0 50%, transparent 12px, #ffffff 13px) top left,
                        radial-gradient(circle at 100% 50%, transparent 12px, #ffffff 13px) top right;
            background-size: 51% 100%;
            background-repeat: no-repeat;
        }
        .custom-scrollbar::-webkit-scrollbar {
            height: 6px;
        }
        .custom-scrollbar::-webkit-scrollbar-track {
            background: #1e293b;
        }
        .custom-scrollbar::-webkit-scrollbar-thumb {
            background: #0d9488;
            border-radius: 3px;
        }