/* roulang page: index */
:root {
            --primary: #059669;
            --primary-hover: #10B981;
            --primary-light: #ECFDF5;
            --dark: #0B0F19;
            --text-main: #0F172A;
            --text-muted: #475569;
            --border-light: #E2E8F0;
            --accent: #F97316;
            --bg-page: #F8FAFC;
        }

        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }

        body {
            background-color: var(--bg-page);
            color: var(--text-main);
            line-height: 1.65;
        }

        .hero-banner-bg {
            background: linear-gradient(135deg, rgba(11, 15, 25, 0.88) 0%, rgba(5, 150, 105, 0.75) 100%), url('/assets/images/e7ada9e046d2a6ad.jpg') center/cover no-repeat;
        }

        .coupon-card {
            background: linear-gradient(135deg, #ffffff 0%, #f0fdf4 100%);
            border: 2px dashed #059669;
            position: relative;
        }

        .coupon-card::before, .coupon-card::after {
            content: '';
            position: absolute;
            top: 50%;
            width: 20px;
            height: 20px;
            background: #0B0F19;
            border-radius: 50%;
            transform: translateY(-50%);
        }
        .coupon-card::before { left: -11px; }
        .coupon-card::after { right: -11px; }

        .card-elevated {
            transition: transform 0.25s ease, box-shadow 0.25s ease;
        }
        .card-elevated:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px -8px rgba(0, 0, 0, 0.08);
        }

        .dark-tech-block {
            background: #0B0F19;
            color: #F8FAFC;
        }