/* roulang page: index */
:root {
            --color-night-dark: #0B132B;
            --color-night-card: #1C2541;
            --color-brand-orange: #FF6B35;
            --color-brand-teal: #00F0A8;
            --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: #F8FAFC;
            color: #1E293B;
            line-height: 1.7;
        }
        .gradient-text {
            background: linear-gradient(135deg, #FF6B35 0%, #00F0A8 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .btn-gradient {
            background: linear-gradient(135deg, #FF6B35 0%, #E85D04 100%);
            transition: var(--transition-smooth);
        }
        .btn-gradient:hover {
            opacity: 0.95;
            transform: translateY(-2px);
            box-shadow: 0 10px 20px -5px rgba(255, 107, 53, 0.4);
        }
        .card-hover {
            transition: var(--transition-smooth);
        }
        .card-hover:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 30px -10px rgba(11, 19, 43, 0.12);
        }
        .faq-body {
            transition: max-height 0.3s ease-out, opacity 0.3s ease;
        }