/* roulang page: index */
:root {
            --color-bg-dark: #0F141C;
            --color-titanium: #1E2633;
            --color-radar: #00D492;
            --color-amber: #FFB020;
            --color-deep-dark: #090D14;
            --color-surface-light: #F6F8FA;
            --color-surface-soft: #EDF1F5;
            --color-text-main: #1D232F;
            --color-text-muted: #5A6578;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: #FFFFFF;
            color: var(--color-text-main);
            overflow-x: hidden;
        }

        .border-subtle {
            border-color: rgba(255, 255, 255, 0.08);
        }

        .border-card-light {
            border-color: rgba(226, 232, 240, 0.85);
        }

        .radar-glow-btn {
            background-color: var(--color-radar);
            box-shadow: 0 0 20px rgba(0, 212, 146, 0.35);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .radar-glow-btn:hover {
            box-shadow: 0 0 28px rgba(0, 212, 146, 0.6);
            transform: translateY(-2px);
        }

        .card-elevate {
            transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
        }

        .card-elevate:hover {
            transform: translateY(-4px);
            border-color: rgba(0, 212, 146, 0.4);
            box-shadow: 0 16px 36px -12px rgba(15, 20, 28, 0.12);
        }

        .dark-card-elevate {
            transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
        }

        .dark-card-elevate:hover {
            transform: translateY(-4px);
            border-color: rgba(0, 212, 146, 0.5);
            box-shadow: 0 20px 40px -15px rgba(0, 212, 146, 0.15);
        }

        .din-number {
            font-family: 'DIN Alternate', 'Impact', sans-serif;
            letter-spacing: -0.5px;
        }

        .hero-radar-pulse {
            position: relative;
        }

        .hero-radar-pulse::after {
            content: '';
            position: absolute;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            border-radius: 50%;
            border: 2px solid var(--color-radar);
            animation: pulse-ring 3s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
        }

        @keyframes pulse-ring {
            0% { transform: scale(0.85); opacity: 0.8; }
            50% { transform: scale(1.35); opacity: 0.2; }
            100% { transform: scale(1.7); opacity: 0; }
        }

        .news-tab-active {
            border-left: 3px solid var(--color-radar);
            background: rgba(0, 212, 146, 0.05);
        }

        .faq-item[open] summary svg {
            transform: rotate(180deg);
        }