/* roulang page: index */
:root {
            --primary: #0F172A;
            --primary-deep: #0B0F19;
            --accent-cyan: #06B6D4;
            --accent-blue: #3B82F6;
            --accent-amber: #F59E0B;
            --text-main: #1E293B;
            --text-muted: #64748B;
            --border-light: #E2E8F0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #FFFFFF;
            line-height: 1.75;
        }
        h1, h2, h3, h4, h5, h6 {
            line-height: 1.3;
        }
        .coupon-cut {
            background-image: radial-gradient(circle at left, transparent 12px, #0F172A 13px), radial-gradient(circle at right, transparent 12px, #0F172A 13px);
            background-size: 51% 100%;
            background-position: left bottom, right bottom;
            background-repeat: no-repeat;
        }
        .coupon-sub-cut {
            background-image: radial-gradient(circle at left, transparent 10px, #ffffff 11px), radial-gradient(circle at right, transparent 10px, #ffffff 11px);
            background-size: 51% 100%;
            background-position: left bottom, right bottom;
            background-repeat: no-repeat;
        }
        .code-grid {
            background-size: 32px 32px;
            background-image: linear-gradient(to right, rgba(255, 255, 255, 0.04) 1px, transparent 1px),
                              linear-gradient(to bottom, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
        }