/* roulang page: index */
:root {
            --color-deep: #0A2E2B;
            --color-dark: #061816;
            --color-primary: #10B981;
            --color-hover: #059669;
            --color-accent: #F97316;
            --color-bg-base: #F8FAFC;
            --color-card-border: #E2E8F0;
            --font-main: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }

        body {
            font-family: var(--font-main);
            background-color: var(--color-bg-base);
            color: #0F172A;
            line-height: 1.7;
            overflow-x: hidden;
        }

        .hero-pattern {
            background-image: linear-gradient(135deg, rgba(10, 46, 43, 0.94) 0%, rgba(6, 24, 22, 0.96) 100%), url('/assets/images/e7a0deed6c8c2ebb.png');
            background-size: cover;
            background-position: center;
        }

        .dark-matrix-bg {
            background-image: linear-gradient(180deg, rgba(6, 24, 22, 0.96) 0%, rgba(10, 46, 43, 0.92) 100%), url('/assets/images/ddc3774a582e6bf3.png');
            background-size: cover;
            background-position: center;
        }

        .glass-card {
            background: rgba(255, 255, 255, 0.04);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .faq-content {
            transition: max-height 0.35s ease-out, opacity 0.3s ease-out;
            max-height: 0;
            opacity: 0;
            overflow: hidden;
        }

        .faq-item.active .faq-content {
            max-height: 280px;
            opacity: 1;
        }

        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }