/* roulang page: index */
:root {
            --color-primary: #10B981;
            --color-primary-bright: #00E599;
            --color-secondary: #06B6D4;
            --color-secondary-dark: #0284C7;
            --color-accent: #F97316;
            --bg-light: #F8FAFC;
            --bg-surface: #FFFFFF;
            --bg-dark: #0F172A;
            --bg-dark-card: #1E293B;
            --bg-footer: #0B0F19;
            --text-main: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --text-light: #F8FAFC;
            --border-light: #E2E8F0;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --shadow-soft: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
            --shadow-glow: 0 10px 30px -5px rgba(16, 185, 129, 0.35);
        }

        *, *::before, *::after {
            box-sizing: border-box;
        }

        html, body {
            margin: 0;
            padding: 0;
            overflow-x: hidden;
            background-color: var(--bg-light);
            color: var(--text-body);
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }

        .font-tech {
            font-family: "DIN Alternate", "Bahnschrift", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
            letter-spacing: -0.02em;
        }

        /* 机能网格背景与光晕 */
        .sport-grid-dark {
            background-color: var(--bg-dark);
            background-image: 
                linear-gradient(to right, rgba(30, 41, 59, 0.55) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(30, 41, 59, 0.55) 1px, transparent 1px);
            background-size: 40px 40px;
        }

        .sport-grid-light {
            background-image: 
                linear-gradient(to right, rgba(226, 232, 240, 0.6) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(226, 232, 240, 0.6) 1px, transparent 1px);
            background-size: 36px 36px;
        }

        /* 定制按钮体系 */
        .btn-sport-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 46px;
            padding: 0.75rem 1.75rem;
            background: linear-gradient(135deg, #10B981 0%, #00E599 100%);
            color: #0F172A;
            font-weight: 700;
            border-radius: var(--radius-sm);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: 0 4px 14px rgba(16, 185, 129, 0.25);
            text-decoration: none;
            cursor: pointer;
            border: none;
        }

        .btn-sport-primary:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-glow);
            filter: brightness(1.04);
        }

        .btn-sport-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 46px;
            padding: 0.75rem 1.75rem;
            background: rgba(15, 23, 42, 0.55);
            color: #F8FAFC;
            font-weight: 600;
            border-radius: var(--radius-sm);
            border: 1px solid rgba(6, 182, 212, 0.5);
            transition: all 0.3s ease;
            text-decoration: none;
            cursor: pointer;
            backdrop-filter: blur(8px);
        }

        .btn-sport-outline:hover {
            background: #06B6D4;
            color: #0F172A;
            border-color: #06B6D4;
            transform: translateY(-2px);
        }

        /* 卡片与悬浮样式 */
        .sport-card-light {
            background: var(--bg-surface);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-soft);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .sport-card-light:hover {
            border-color: var(--color-primary);
            transform: translateY(-4px);
            box-shadow: 0 14px 30px -5px rgba(16, 185, 129, 0.14);
        }

        .sport-card-dark {
            background: rgba(30, 41, 59, 0.75);
            border: 1px solid rgba(16, 185, 129, 0.16);
            border-radius: var(--radius-lg);
            box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
            backdrop-filter: blur(12px);
            transition: all 0.3s ease;
        }

        .sport-card-dark:hover {
            border-color: rgba(0, 229, 153, 0.45);
            box-shadow: 0 12px 32px -8px rgba(16, 185, 129, 0.22);
        }

        /* 呼吸指示灯 */
        @keyframes pulse-ring {
            0% { transform: scale(0.85); opacity: 0.9; }
            50% { transform: scale(1.35); opacity: 0.3; }
            100% { transform: scale(0.85); opacity: 0.9; }
        }
        .status-dot-ring {
            animation: pulse-ring 2s infinite ease-in-out;
        }

        /* 骨骼点闪烁动效 */
        @keyframes node-blink {
            0%, 100% { r: 5; opacity: 1; }
            50% { r: 7; opacity: 0.65; }
        }
        .skeleton-node {
            animation: node-blink 2.2s infinite ease-in-out;
        }

        /* 导航高亮与手风琴过渡 */
        .nav-anchor {
            position: relative;
            color: #334155;
            font-weight: 500;
            transition: color 0.2s ease;
        }
        .nav-anchor:hover, .nav-anchor.active {
            color: #059669;
        }
        .nav-anchor::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, #10B981, #06B6D4);
            transition: width 0.25s ease;
        }
        .nav-anchor:hover::after, .nav-anchor.active::after {
            width: 100%;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .faq-item.open .faq-answer {
            max-height: 420px;
        }
        .faq-item.open .faq-icon {
            transform: rotate(180deg);
        }

        @media (max-width: 768px) {
            .hero-title-responsive {
                font-size: 2rem !important;
                line-height: 1.25 !important;
            }
        }