/* roulang page: index */
:root {
            --primary-gradient: linear-gradient(135deg, #6366F1 0%, #3B82F6 50%, #06B6D4 100%);
            --accent-orange: #F97316;
            --accent-green: #10B981;
            --bg-light: #F8FAFC;
            --dark-surface: #0F172A;
            --dark-card: #1E293B;
            --text-main: #0F172A;
            --text-muted: #64748B;
            --border-soft: rgba(226, 232, 240, 0.8);
            --card-shadow: 0 10px 30px -10px rgba(99, 102, 241, 0.12);
        }
        
        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-light);
            color: #334155;
            overflow-x: hidden;
            scroll-behavior: smooth;
        }

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

        .gradient-btn {
            background: var(--primary-gradient);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .gradient-btn:hover {
            opacity: 0.95;
            transform: translateY(-2px);
            box-shadow: 0 12px 24px -6px rgba(99, 102, 241, 0.35);
        }

        .card-custom {
            background: #FFFFFF;
            border: 1px solid var(--border-soft);
            box-shadow: var(--card-shadow);
            border-radius: 1.25rem;
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
        }

        .card-custom:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 35px -12px rgba(99, 102, 241, 0.18);
            border-color: rgba(99, 102, 241, 0.3);
        }

        .badge-pill {
            display: inline-flex;
            align-items: center;
            gap: 0.375rem;
            padding: 0.35rem 0.85rem;
            border-radius: 9999px;
            font-size: 0.8125rem;
            font-weight: 600;
        }

        .pulse-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            animation: pulse-ring 2s infinite cubic-bezier(0.45, 0, 0.2, 1);
        }

        @keyframes pulse-ring {
            0% { transform: scale(0.9); opacity: 0.7; }
            50% { transform: scale(1.3); opacity: 1; }
            100% { transform: scale(0.9); opacity: 0.7; }
        }

        .grid-pattern {
            background-size: 32px 32px;
            background-image: linear-gradient(to right, rgba(203, 213, 225, 0.25) 1px, transparent 1px),
                              linear-gradient(to bottom, rgba(203, 213, 225, 0.25) 1px, transparent 1px);
        }

        .accordion-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .accordion-item.active .accordion-content {
            max-height: 250px;
        }
        .accordion-item.active .accordion-icon {
            transform: rotate(180deg);
        }