/* roulang page: index */
:root {
            --color-primary: #0F2C59;
            --color-primary-dark: #0B192C;
            --color-accent: #D4AF37;
            --color-accent-hover: #C5A059;
            --color-bg-light: #F8FAFC;
            --color-text-main: #1E293B;
            --color-text-muted: #475569;
            --radius-card: 14px;
            --shadow-soft: 0 10px 30px -10px rgba(15, 44, 89, 0.08);
            --shadow-hover: 0 16px 36px -10px rgba(15, 44, 89, 0.16);
        }

        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            color: var(--color-text-main);
        }

        section {
            scroll-margin-top: 84px;
        }

        .card-custom {
            border: 1px solid rgba(15, 44, 89, 0.08);
            box-shadow: var(--shadow-soft);
            transition: all 0.3s ease;
        }

        .card-custom:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(212, 175, 55, 0.3);
        }

        .btn-gold {
            background: linear-gradient(135deg, #D4AF37 0%, #C5A059 100%);
            color: #ffffff;
            transition: all 0.25s ease;
        }

        .btn-gold:hover {
            opacity: 0.95;
            transform: translateY(-1px);
            box-shadow: 0 6px 18px rgba(212, 175, 55, 0.35);
        }

        .btn-navy {
            background-color: var(--color-primary);
            color: #ffffff;
            transition: all 0.25s ease;
        }

        .btn-navy:hover {
            background-color: var(--color-primary-dark);
            transform: translateY(-1px);
        }

        /* Accordion transition */
        details summary::-webkit-details-marker {
            display: none;
        }