/* roulang page: index */
:root {
            --primary: #EA580C;
            --primary-dark: #C2410C;
            --secondary: #1E293B;
            --slate-bg: #F8FAFC;
            --accent: #84CC16;
            --text-main: #0F172A;
            --text-muted: #64748B;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: #FFFFFF;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        .text-industrial { color: var(--primary); }
        .bg-industrial { background-color: var(--primary); }
        .bg-slate-panel { background-color: var(--secondary); }
        .bg-canvas { background-color: var(--slate-bg); }
        .border-theme { border-color: #E2E8F0; }
        .shadow-soft { box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.05); }
        .shadow-card-hover { transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); }
        .shadow-card-hover:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 28px -4px rgba(234, 88, 12, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
        }
        .accordion-content.active {
            max-height: 300px;
        }