/* roulang page: index */
:root {
            --color-primary: #1A1F2C;
            --color-secondary: #0E131F;
            --color-accent: #00D084;
            --color-warn: #FF8F3D;
            --color-bg-light: #F4F6F9;
            --color-card-border: rgba(226, 232, 240, 0.85);
        }
        html { scroll-behavior: smooth; }
        body { font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif; background-color: #F4F6F9; color: #1E293B; }
        .hero-bg {
            background: linear-gradient(135deg, rgba(14, 19, 31, 0.94) 0%, rgba(26, 31, 44, 0.92) 100%), url('/assets/images/9438c2e9630b597e.webp') center/cover no-repeat;
        }
        .deep-dark-bg {
            background: linear-gradient(180deg, #0B0E14 0%, #111622 100%);
        }
        .circuit-pattern {
            background-image: radial-gradient(rgba(0, 208, 132, 0.12) 1px, transparent 0);
            background-size: 24px 24px;
        }
        .glow-border {
            box-shadow: 0 0 15px rgba(0, 208, 132, 0.15);
        }
        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .accordion-open .accordion-content {
            max-height: 300px;
        }
        .accordion-open .accordion-icon {
            transform: rotate(180deg);
        }