/* roulang page: index */
:root {
            --primary: #0052FF;
            --primary-dark: #0A2540;
            --accent-orange: #FF5C00;
            --accent-cyan: #00C6FF;
            --bg-light: #F6F9FC;
            --text-main: #1D2939;
            --text-muted: #667085;
            --radius-lg: 20px;
        }

        html {
            scroll-behavior: smooth;
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Source Han Sans CN", sans-serif;
        }

        body {
            background-color: #FFFFFF;
            color: var(--text-main);
            overflow-x: hidden;
        }

        .gradient-text {
            background: linear-gradient(135deg, #0052FF 0%, #00C6FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .gradient-orange-text {
            background: linear-gradient(135deg, #FF5C00 0%, #FF8A00 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .btn-gradient {
            background: linear-gradient(135deg, #0052FF 0%, #0077FF 100%);
            transition: all 0.3s ease;
        }

        .btn-gradient:hover {
            box-shadow: 0 8px 24px rgba(0, 82, 255, 0.35);
            transform: translateY(-2px);
        }

        .btn-accent {
            background: linear-gradient(135deg, #FF5C00 0%, #FF7A00 100%);
            transition: all 0.3s ease;
        }

        .btn-accent:hover {
            box-shadow: 0 8px 24px rgba(255, 92, 0, 0.35);
            transform: translateY(-2px);
        }

        .card-box {
            background: #FFFFFF;
            border: 1px solid #E4E7EC;
            border-radius: var(--radius-lg);
            transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .card-box:hover {
            border-color: #0052FF;
            box-shadow: 0 16px 36px rgba(10, 37, 64, 0.08);
            transform: translateY(-6px);
        }

        .dark-glass-card {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(12px);
            border-radius: var(--radius-lg);
            transition: all 0.3s ease;
        }

        .dark-glass-card:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: #00C6FF;
            box-shadow: 0 0 30px rgba(0, 198, 255, 0.15);
            transform: translateY(-4px);
        }

        .badge-capsule {
            display: inline-flex;
            align-items: center;
            padding: 4px 12px;
            border-radius: 9999px;
            font-size: 0.75rem;
            font-weight: 600;
        }

        details > summary {
            list-style: none;
        }
        details > summary::-webkit-details-marker {
            display: none;
        }