/* roulang page: index */
:root {
            --primary: #1E40AF;
            --primary-hover: #1D4ED8;
            --accent: #0284C7;
            --success: #059669;
            --surface-bg: #F8FAFC;
            --surface-card: #FFFFFF;
            --text-heading: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-color: #E2E8F0;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--surface-bg);
            color: var(--text-body);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        .hero-progress-ring {
            stroke-dasharray: 283;
            stroke-dashoffset: 22.64; /* 92% 进度 */
            transition: stroke-dashoffset 1.5s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .industrial-card {
            background-color: var(--surface-card);
            border: 1px solid var(--border-color);
            border-radius: 0.75rem;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .industrial-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 24px -10px rgba(15, 23, 42, 0.08), 0 4px 6px -2px rgba(15, 23, 42, 0.02);
            border-color: #CBD5E1;
        }

        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .accordion-item.active .accordion-content {
            max-height: 240px;
        }
        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }