/* roulang page: index */
:root {
            --primary: #00D2A0;
            --primary-purple: #6C5CE7;
            --dark: #0F172A;
            --light-bg: #F8F9FD;
            --card-border: #E2E8F0;
        }
        html { scroll-behavior: smooth; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background-color: #F8F9FD; color: #334155; }
        .hero-banner {
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 41, 59, 0.88) 100%), url('/assets/images/1867df40630f5b32.png') center/cover no-repeat;
        }
        .tech-dark-bg {
            background: radial-gradient(circle at 80% 20%, rgba(108, 92, 231, 0.15) 0%, transparent 50%), radial-gradient(circle at 20% 80%, rgba(0, 210, 160, 0.1) 0%, transparent 50%), #0F172A;
        }
        .gradient-text {
            background: linear-gradient(135deg, #00D2A0 0%, #6C5CE7 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .gradient-btn {
            background: linear-gradient(135deg, #00D2A0 0%, #00B894 100%);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .gradient-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 25px -5px rgba(0, 210, 160, 0.4);
        }
        .card-soft {
            background: #FFFFFF;
            border: 1px solid #E2E8F0;
            transition: all 0.3s ease;
        }
        .card-soft:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 25px -5px rgba(15, 23, 42, 0.08);
            border-color: #CBD5E1;
        }
        .faq-item-body {
            transition: max-height 0.35s ease, opacity 0.3s ease;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .faq-item.active .faq-item-body {
            max-height: 220px;
            opacity: 1;
        }
        .faq-item.active .faq-chevron {
            transform: rotate(180deg);
        }