/* roulang page: index */
:root {
            --color-bg-deep: #030712;
            --color-bg-navy: #0B132B;
            --color-neon-blue: #00F2FE;
            --color-neon-cyan: #4FACFE;
            --color-border-glow: rgba(0, 242, 254, 0.25);
            --glass-bg: rgba(15, 23, 42, 0.72);
        }
        
        body {
            background-color: var(--color-bg-deep);
            color: #94A3B8;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
            scroll-behavior: smooth;
        }

        .glass-panel {
            background: var(--glass-bg);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .glass-panel:hover {
            border-color: rgba(0, 242, 254, 0.4);
            box-shadow: 0 0 25px rgba(0, 242, 254, 0.12);
            transform: translateY(-2px);
        }

        .btn-glow {
            background: linear-gradient(135deg, #00F2FE 0%, #4FACFE 100%);
            box-shadow: 0 0 20px rgba(79, 172, 254, 0.4);
            transition: all 0.25s ease;
        }

        .btn-glow:hover {
            box-shadow: 0 0 30px rgba(0, 242, 254, 0.7);
            transform: translateY(-2px);
        }

        .text-glow {
            text-shadow: 0 0 16px rgba(0, 242, 254, 0.45);
        }

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

        .faq-item.active .faq-content {
            max-height: 400px;
            opacity: 1;
        }

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