/* roulang page: index */
:root {
            --primary: #1E3A8A;
            --royal: #2563EB;
            --electric: #06B6D4;
            --bg-light: #F8FAFC;
            --text-main: #334155;
            --text-muted: #64748B;
            --border-soft: rgba(226, 232, 240, 0.85);
            --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --card-shadow-hover: 0 16px 32px -4px rgba(37, 99, 235, 0.1);
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: var(--bg-light);
            line-height: 1.75;
            overflow-x: hidden;
        }
        .clean-card {
            background: #ffffff;
            border: 1px solid var(--border-soft);
            box-shadow: var(--card-shadow);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .clean-card:hover {
            box-shadow: var(--card-shadow-hover);
            transform: translateY(-2px);
        }
        .newsletter-quote {
            border-left: 4px solid var(--royal);
            background: rgba(37, 99, 235, 0.03);
        }
        .ping-badge {
            display: inline-flex;
            align-items: center;
            font-variant-numeric: tabular-nums;
        }

/* roulang page: category1 */
:root {
        --primary: #1E3A8A;
        --royal: #2563EB;
        --electric: #06B6D4;
        --bg-light: #F8FAFC;
        --text-main: #334155;
        --text-muted: #64748B;
        --border-soft: rgba(226, 232, 240, 0.85);
        --card-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
        --card-shadow-hover: 0 16px 32px -4px rgba(37, 99, 235, 0.1);
    }
    body {
        font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        color: var(--text-main);
        background-color: var(--bg-light);
        line-height: 1.75;
        overflow-x: hidden;
    }
    .clean-card {
        background: #ffffff;
        border: 1px solid var(--border-soft);
        box-shadow: var(--card-shadow);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .clean-card:hover {
        box-shadow: var(--card-shadow-hover);
        transform: translateY(-2px);
    }
    .ping-badge {
        display: inline-flex;
        align-items: center;
        font-variant-numeric: tabular-nums;
    }
    .filter-btn.active {
        background-color: #2563EB;
        color: #ffffff;
        border-color: #2563EB;
    }