/* roulang page: index */
:root {
            --color-bg-base: #F4F6F9;
            --color-dark: #12151A;
            --color-primary: #1E293B;
            --color-accent: #FF6B00;
            --color-border: #E2E8F0;
        }
        body {
            background-color: var(--color-bg-base);
            color: #334155;
            font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
            overflow-x: hidden;
        }
        .btn-safety {
            background-color: var(--color-accent);
            color: #ffffff;
            transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: 0 4px 12px rgba(255, 107, 0, 0.25);
        }
        .btn-safety:hover {
            background-color: #E55F00;
            transform: translateY(-2px);
            box-shadow: 0 6px 18px rgba(255, 107, 0, 0.35);
        }
        .card-industrial {
            background: #ffffff;
            border: 1px solid var(--color-border);
            transition: all 0.25s ease;
        }
        .card-industrial:hover {
            border-color: #CBD5E1;
            transform: translateY(-3px);
            box-shadow: 0 12px 24px -10px rgba(15, 23, 42, 0.08);
        }
        .dark-card-industrial {
            background: #1A1F26;
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: all 0.25s ease;
        }
        .dark-card-industrial:hover {
            border-color: rgba(255, 107, 0, 0.4);
            transform: translateY(-3px);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .accordion-item.active .accordion-content {
            max-height: 280px;
        }
        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }