/* roulang page: index */
:root {
            --color-primary: #0F2027;
            --color-teal: #005A5B;
            --color-accent: #00A887;
            --color-accent-hover: #008F72;
            --color-bg-light: #F8FAFC;
            --color-bg-alt: #F1F5F9;
            --color-bg-dark: #0B1315;
            --color-text-main: #0A1118;
            --color-text-body: #334155;
            --color-text-muted: #64748B;
            --color-border: #E2E8F0;
            --radius-card: 16px;
            --radius-btn: 8px;
            --shadow-card: 0 4px 20px -2px rgba(15, 32, 39, 0.05);
            --shadow-hover: 0 14px 30px -4px rgba(0, 90, 91, 0.12);
        }

        *, *::before, *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 108px;
        }

        body {
            font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--color-text-body);
            background-color: var(--color-bg-light);
            line-height: 1.65;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        h1, h2, h3, h4, .heading-font {
            color: var(--color-text-main);
            letter-spacing: -0.02em;
            line-height: 1.25;
        }

        .num-mono {
            font-family: 'JetBrains Mono', monospace;
            font-variant-numeric: tabular-nums;
        }

        /* Custom UI Components */
        .fintech-card {
            background: #FFFFFF;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .fintech-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(0, 168, 135, 0.35);
        }

        .btn-primary-mint {
            background: linear-gradient(135deg, #00A887 0%, #008F72 100%);
            color: #FFFFFF;
            border-radius: var(--radius-btn);
            font-weight: 600;
            transition: all 0.25s ease;
            box-shadow: 0 4px 14px rgba(0, 168, 135, 0.25);
        }

        .btn-primary-mint:hover {
            background: linear-gradient(135deg, #00B894 0%, #007A60 100%);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(0, 168, 135, 0.38);
        }

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

        .btn-outline-graphite {
            background: rgba(255, 255, 255, 0.9);
            color: var(--color-primary);
            border: 1px solid #CBD5E1;
            border-radius: var(--radius-btn);
            font-weight: 600;
            transition: all 0.25s ease;
        }

        .btn-outline-graphite:hover {
            border-color: var(--color-teal);
            color: var(--color-teal);
            background: #F0FDF9;
        }

        /* Quiz Radio Option Active State */
        .quiz-opt {
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .quiz-opt.active {
            border-color: #00A887;
            background-color: rgba(0, 168, 135, 0.12);
            color: #FFFFFF;
            box-shadow: 0 0 0 1px #00A887;
        }

        /* Subtle Grid Background Pattern */
        .bg-grid-slate {
            background-image: radial-gradient(rgba(0, 90, 91, 0.1) 1px, transparent 1px);
            background-size: 24px 24px;
        }

        .bg-grid-dark {
            background-image: linear-gradient(to right, rgba(255,255,255,0.03) 1px, transparent 1px),
                              linear-gradient(to bottom, rgba(255,255,255,0.03) 1px, transparent 1px);
            background-size: 36px 36px;
        }

        /* Accordion Smooth Transition */
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1), padding 0.35s ease;
        }
        .faq-item.open .faq-answer {
            max-height: 360px;
        }
        .faq-item.open .faq-icon {
            transform: rotate(180deg);
            color: #00A887;
        }

        /* Custom Scrollbar */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        ::-webkit-scrollbar-track {
            background: #F1F5F9;
        }
        ::-webkit-scrollbar-thumb {
            background: #94A3B8;
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: #005A5B;
        }

        /* Responsive adjustments */
        @media (max-width: 768px) {
            html {
                scroll-padding-top: 76px;
            }
            .section-pad {
                padding-top: 3.5rem;
                padding-bottom: 3.5rem;
            }
        }