/* roulang page: index */
:root {
            --primary: #10b981;
            --primary-dark: #059669;
            --accent-cyan: #06b6d4;
            --accent-orange: #f97316;
            --bg-main: #f8fafc;
            --bg-card: #ffffff;
            --text-heading: #0f172a;
            --text-body: #334155;
            --text-muted: #64748b;
            --border-color: rgba(226, 232, 240, 0.8);
            --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
            --gradient-brand: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-main);
            color: var(--text-body);
            line-height: 1.7;
            letter-spacing: 0.02em;
            margin: 0;
            padding: 0;
        }

        .gradient-brand-bg {
            background: var(--gradient-brand);
        }

        .gradient-brand-text {
            background: var(--gradient-brand);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .card-custom {
            border-radius: 1.25rem;
            border: 1px solid var(--border-color);
            background: var(--bg-card);
            box-shadow: var(--shadow-card);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 30px -10px rgba(16, 185, 129, 0.12);
        }

        .badge-pill {
            display: inline-flex;
            align-items: center;
            border-radius: 9999px;
            padding: 0.25rem 0.85rem;
            font-size: 0.85rem;
            font-weight: 600;
            background: rgba(16, 185, 129, 0.12);
            color: var(--primary-dark);
        }

        details > summary {
            list-style: none;
        }
        details > summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary svg {
            transform: rotate(180deg);
        }

        html {
            scroll-behavior: smooth;
        }