/* roulang page: index */
:root {
            --primary: #0284c7;
            --primary-dark: #0369a1;
            --accent: #0ea5e9;
            --dark-navy: #0a1128;
            --bg-light: #f8fafc;
            --text-main: #0f172a;
            --text-muted: #475569;
            --card-shadow: 0 4px 20px -4px rgba(2, 132, 199, 0.06);
            --card-shadow-hover: 0 12px 28px -6px rgba(2, 132, 199, 0.16);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            color: var(--text-main);
            background-color: #ffffff;
            overflow-x: hidden;
        }

        .custom-card {
            box-shadow: var(--card-shadow);
            transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .custom-card:hover {
            box-shadow: var(--card-shadow-hover);
            transform: translateY(-3px);
        }

        .code-box {
            background: #0f172a;
            color: #38bdf8;
            font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
        }

        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
        }
        .accordion-item.active .accordion-content {
            max-height: 240px;
        }
        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }