/* roulang page: index */
:root {
            --bg-deep: #070B14;
            --bg-card: rgba(15, 23, 42, 0.72);
            --brand-blue: #0066FF;
            --brand-cyan: #00E5FF;
            --brand-border: rgba(255, 255, 255, 0.08);
            --brand-border-hover: rgba(0, 229, 255, 0.35);
        }
        body {
            background-color: var(--bg-deep);
            color: #F8FAFC;
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            overflow-x: hidden;
        }
        .glass-panel {
            background: var(--bg-card);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--brand-border);
            box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.7);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .glass-panel:hover {
            border-color: var(--brand-border-hover);
        }
        .glow-btn {
            background: linear-gradient(135deg, #0066FF 0%, #0052CC 100%);
            box-shadow: 0 0 25px rgba(0, 102, 255, 0.45);
            transition: all 0.25s ease;
        }
        .glow-btn:hover {
            box-shadow: 0 0 35px rgba(0, 229, 255, 0.65);
            transform: translateY(-2px);
        }
        .glow-cyan-btn {
            background: linear-gradient(135deg, rgba(0, 229, 255, 0.15) 0%, rgba(0, 102, 255, 0.2) 100%);
            border: 1px solid rgba(0, 229, 255, 0.4);
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.2);
            transition: all 0.25s ease;
        }
        .glow-cyan-btn:hover {
            border-color: #00E5FF;
            box-shadow: 0 0 30px rgba(0, 229, 255, 0.45);
            transform: translateY(-2px);
        }
        .badge-cyan {
            background: rgba(0, 229, 255, 0.1);
            border: 1px solid rgba(0, 229, 255, 0.3);
            color: #00E5FF;
        }
        .badge-blue {
            background: rgba(0, 102, 255, 0.12);
            border: 1px solid rgba(0, 102, 255, 0.3);
            color: #60A5FA;
        }
        .tech-gradient-border {
            position: relative;
        }
        .tech-gradient-border::before {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: inherit;
            padding: 1px;
            background: linear-gradient(135deg, rgba(0, 229, 255, 0.5), transparent 60%);
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            pointer-events: none;
        }
        details summary::-webkit-details-marker {
            display:none;
        }
        details[open] summary .faq-icon {
            transform: rotate(180deg);
            color: #00E5FF;
        }