/* roulang page: index */
:root {
            --primary: #00A86B;
            --primary-hover: #008F5B;
            --accent: #FF6B00;
            --bg-light: #F4F6F9;
            --dark-tech: #0D131A;
            --text-main: #111827;
            --text-sub: #4B5563;
            --border-color: #E5E7EB;
        }
        html { scroll-behavior: smooth; }
        body { font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; line-height: 1.65; color: var(--text-main); background-color: var(--bg-light); }
        .hero-bg {
            background: linear-gradient(rgba(13, 19, 26, 0.88), rgba(13, 19, 26, 0.92)), url('/assets/images/cac1e87a251a3741.webp') center/cover no-repeat;
        }
        .dark-section-bg {
            background: radial-gradient(circle at 80% 20%, #172433 0%, #0D131A 100%);
        }
        .coupon-notch {
            position: relative;
            background: radial-gradient(circle at left, transparent 10px, #ffffff 11px) left,
                        radial-gradient(circle at right, transparent 10px, #ffffff 11px) right;
            background-size: 51% 100%;
            background-repeat: no-repeat;
        }