/* roulang page: index */
:root {
            --primary: #10B981;
            --primary-dark: #047857;
            --accent: #FF5722;
            --bg-light: #F8FAFC;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #FFFFFF;
            line-height: 1.7;
        }
        .scroll-mt-header {
            scroll-margin-top: 96px;
        }
        .coupon-mask {
            background: radial-gradient(circle at left, transparent 8px, #ffffff 8.5px) left,
                        radial-gradient(circle at right, transparent 8px, #ffffff 8.5px) right;
            background-size: 51% 100%;
            background-repeat: no-repeat;
        }
        details > summary {
            list-style: none;
        }
        details > summary::-webkit-details-marker {
            display: none;
        }