/* roulang page: index */
:root {
            --brand-gradient: linear-gradient(135deg, #06B6D4 0%, #10B981 100%);
            --brand-gradient-hover: linear-gradient(135deg, #0891B2 0%, #059669 100%);
            --compute-gradient: linear-gradient(135deg, #3B82F6 0%, #6366F1 100%);
            --bg-light: #F8FAFC;
            --bg-white: #FFFFFF;
            --bg-dark: #0B0F19;
            --text-main: #0F172A;
            --text-secondary: #475569;
            --text-muted: #94A3B8;
            --radius-card: 1.25rem;
            --radius-lg: 1.5rem;
        }

        * {
            box-sizing: border-box;
        }

        body {
            background-color: var(--bg-light);
            color: var(--text-main);
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
            line-height: 1.6;
            overflow-x: hidden;
            margin: 0;
        }

        /* Brand Gradients */
        .bg-brand-gradient {
            background-image: var(--brand-gradient);
        }
        .bg-brand-gradient:hover {
            background-image: var(--brand-gradient-hover);
        }
        .text-brand-gradient {
            background: var(--brand-gradient);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .border-brand-glow {
            position: relative;
        }
        .border-brand-glow::after {
            content: '';
            position: absolute;
            inset: -1px;
            border-radius: inherit;
            padding: 1.5px;
            background: var(--brand-gradient);
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            pointer-events: none;
        }

        /* Card Interactions */
        .athletic-card {
            background: var(--bg-white);
            border-radius: var(--radius-card);
            border: 1px solid rgba(226, 232, 240, 0.9);
            box-shadow: 0 10px 30px -5px rgba(15, 23, 42, 0.05);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .athletic-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 20px 40px -10px rgba(6, 182, 212, 0.16);
            border-color: rgba(6, 182, 212, 0.45);
        }

        .dark-card {
            background: rgba(17, 24, 39, 0.85);
            border: 1px solid rgba(51, 65, 85, 0.7);
            border-radius: var(--radius-card);
            backdrop-filter: blur(12px);
            transition: all 0.3s ease;
        }
        .dark-card:hover {
            transform: translateY(-4px);
            border-color: #10B981;
            box-shadow: 0 20px 40px -12px rgba(16, 185, 129, 0.22);
        }

        /* Grid Technical Background */
        .tech-grid-bg {
            background-size: 36px 36px;
            background-image: 
                linear-gradient(to right, rgba(148, 163, 184, 0.08) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(148, 163, 184, 0.08) 1px, transparent 1px);
        }

        /* Custom Scrollbar */
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        ::-webkit-scrollbar-track {
            background: #0F172A;
        }
        ::-webkit-scrollbar-thumb {
            background: #334155;
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: #06B6D4;
        }

        /* Accordion Animations */
        details > summary {
            list-style: none;
        }
        details > summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary ~ * {
            animation: slideDown 0.25s ease-in-out;
        }
        @keyframes slideDown {
            0% { opacity: 0; transform: translateY(-6px); }
            100% { opacity: 1; transform: translateY(0); }
        }

        /* Responsive Touch Targets */
        @media (max-width: 768px) {
            .touch-target {
                min-height: 44px;
                min-width: 44px;
            }
        }