/* roulang page: index */
:root {
            --brand-primary: #0D3B36;
            --brand-accent: #00A878;
            --brand-amber: #F39C12;
            --bg-neutral: #F7F9F8;
            --bg-dark: #061715;
            --text-title: #111918;
            --text-body: #475553;
            --text-muted: #7C8D8A;
            --card-border: #E3E8E6;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-body);
            background-color: var(--bg-neutral);
            line-height: 1.75;
        }

        .hero-video-bg {
            background-image: linear-gradient(rgba(6, 23, 21, 0.78), rgba(13, 59, 54, 0.88)), url('/assets/images/c661f7e26e6ab91c.png');
            background-size: cover;
            background-position: center;
        }

        .dark-philosophy-bg {
            background-image: linear-gradient(rgba(6, 23, 21, 0.94), rgba(6, 23, 21, 0.97)), url('/assets/images/1dc254ff69599118.jpg');
            background-size: cover;
            background-position: center;
        }

        .section-py {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }

        @media (min-width: 1024px) {
            .section-py {
                padding-top: 6.5rem;
                padding-bottom: 6.5rem;
            }
        }

        .card-custom {
            background-color: #FFFFFF;
            border: 1px solid var(--card-border);
            border-radius: 0.875rem;
            box-shadow: 0 4px 20px -2px rgba(13, 59, 54, 0.05);
            transition: all 0.25s ease;
        }

        .card-custom:hover {
            transform: translateY(-4px);
            border-color: rgba(0, 168, 120, 0.4);
            box-shadow: 0 12px 28px -4px rgba(13, 59, 54, 0.12);
        }

        details > summary {
            list-style: none;
        }
        details > summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary .faq-chevron {
            transform: rotate(180deg);
        }
        details summary .faq-chevron {
            transition: transform 0.2s ease;
        }