/* roulang page: index */
:root {
            --bg-pitch-dark: #0B0E14;
            --bg-pitch-card: #121820;
            --border-glow: rgba(0, 230, 118, 0.15);
            --brand-green: #00E676;
            --brand-emerald: #10B981;
            --brand-amber: #F59E0B;
            --text-high: #FFFFFF;
            --text-mid: #94A3B8;
            --text-low: #64748B;
        }

        body {
            background-color: var(--bg-pitch-dark);
            color: var(--text-high);
            font-family: Inter, -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        .code-font {
            font-family: 'JetBrains Mono', Menlo, Monaco, 'Courier New', monospace;
        }

        .glow-card {
            background: linear-gradient(180deg, rgba(27, 35, 48, 0.5) 0%, rgba(18, 24, 32, 0.8) 100%);
            border: 1px solid rgba(148, 163, 184, 0.12);
            transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .glow-card:hover {
            border-color: rgba(0, 230, 118, 0.35);
            box-shadow: 0 8px 30px rgba(0, 230, 118, 0.08);
            transform: translateY(-3px);
        }

        .gradient-line {
            background: linear-gradient(90deg, rgba(0, 230, 118, 0.8) 0%, rgba(16, 185, 129, 0.2) 50%, transparent 100%);
        }

        .pulse-beacon {
            box-shadow: 0 0 0 0 rgba(0, 230, 118, 0.7);
            animation: pulse-ring 2s infinite cubic-bezier(0.66, 0, 0, 1);
        }

        @keyframes pulse-ring {
            to {
                box-shadow: 0 0 0 8px rgba(0, 230, 118, 0);
            }
        }

        .terminal-scroll::-webkit-scrollbar {
            width: 4px;
        }
        .terminal-scroll::-webkit-scrollbar-thumb {
            background: #283346;
            border-radius: 4px;
        }

        /* FAQ 手风琴动画 */
        details summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary svg {
            transform: rotate(180deg);
        }