/* roulang page: index */
:root {
            --color-primary: #0F172A;
            --color-primary-light: #1E293B;
            --color-cyan: #0284C7;
            --color-green: #10B981;
            --color-amber: #F59E0B;
            --color-bg-base: #FFFFFF;
            --color-bg-subtle: #F8FAFC;
            --border-subtle: rgba(226, 232, 240, 0.85);
            --border-dark: rgba(255, 255, 255, 0.12);
        }
        *, *::before, *::after {
            box-sizing: border-box;
        }
        body {
            background-color: var(--color-bg-base);
            color: #334155;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            line-height: 1.6;
            overflow-x: hidden;
        }
        .technical-grid {
            background-size: 28px 28px;
            background-image: 
                linear-gradient(to right, rgba(15, 23, 42, 0.04) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(15, 23, 42, 0.04) 1px, transparent 1px);
        }
        .technical-grid-dark {
            background-size: 32px 32px;
            background-image: 
                linear-gradient(to right, rgba(255, 255, 255, 0.05) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
        }
        .industrial-card {
            border: 1px solid var(--border-subtle);
            transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .industrial-card:hover {
            border-color: rgba(2, 132, 199, 0.4);
            transform: translateY(-3px);
            box-shadow: 0 16px 32px -8px rgba(15, 23, 42, 0.08);
        }
        .stat-glow {
            text-shadow: 0 0 12px rgba(2, 132, 199, 0.3);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .accordion-open .accordion-content {
            max-height: 480px;
        }
        .accordion-open .accordion-icon {
            transform: rotate(180deg);
        }