/* roulang page: index */
:root {
            --primary: #0F52BA;
            --accent: #4F46E5;
            --brand-cyan: #06B6D4;
            --amber-warn: #F59E0B;
            --bg-canvas: #F8FAFC;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --border-card: rgba(226, 232, 240, 0.85);
            --shadow-subtle: 0 10px 25px -5px rgba(15, 23, 42, 0.05);
            --shadow-hover: 0 20px 35px -5px rgba(15, 23, 42, 0.12);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
            background-color: var(--bg-canvas);
            color: var(--text-body);
            line-height: 1.6;
            overflow-x: hidden;
            scroll-behavior: smooth;
        }

        .custom-card {
            background-color: #FFFFFF;
            border-radius: 20px;
            border: 1px solid var(--border-card);
            box-shadow: var(--shadow-subtle);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .custom-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
        }

        .badge-glow {
            background: rgba(15, 82, 186, 0.08);
            border: 1px solid rgba(15, 82, 186, 0.2);
            color: var(--primary);
        }

        .btn-gradient {
            background: linear-gradient(135deg, #0F52BA 0%, #4F46E5 50%, #06B6D4 100%);
            color: #FFFFFF;
            transition: all 0.25s ease;
            box-shadow: 0 4px 14px rgba(15, 82, 186, 0.35);
        }

        .btn-gradient:hover {
            opacity: 0.95;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(15, 82, 186, 0.45);
        }

        .btn-gradient:active {
            transform: translateY(0);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }

        .faq-item.active .faq-answer {
            max-height: 250px;
        }

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