/* roulang page: index */
:root {
            --bg-base: #0A0D14;
            --bg-secondary: #121620;
            --bg-card: #181E2B;
            --color-gold: #D4AF37;
            --color-cyan: #00C2FF;
            --color-green: #00E599;
            --text-main: #FFFFFF;
            --text-muted: #A0AEC0;
            --border-dim: rgba(255, 255, 255, 0.08);
            --border-gold-dim: rgba(212, 175, 55, 0.25);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            background-color: var(--bg-base);
            color: var(--text-main);
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            line-height: 1.65;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        /* 工业级发光微网格与背景渐变 */
        .tech-grid {
            background-size: 40px 40px;
            background-image: 
                linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
        }

        .gradient-border-gold {
            border: 1px solid var(--border-gold-dim);
            background: linear-gradient(180deg, rgba(212, 175, 55, 0.06) 0%, rgba(212, 175, 55, 0.01) 100%);
        }

        .card-surface {
            background: linear-gradient(180deg, rgba(255, 255, 255, 0.04) 0%, rgba(255, 255, 255, 0.01) 100%);
            border: 1px solid var(--border-dim);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .card-surface:hover {
            transform: translateY(-4px);
            border-color: rgba(212, 175, 55, 0.4);
            box-shadow: 0 15px 35px -10px rgba(0, 0, 0, 0.8), 0 0 15px -3px rgba(212, 175, 55, 0.2);
        }

        /* 控制台代码与等宽字体面板 */
        .mono-num {
            font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
        }

        /* 自定义手风琴过度效果 */
        .faq-content {
            transition: max-height 0.35s ease-out, opacity 0.3s ease-out;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .faq-item.active .faq-content {
            max-height: 400px;
            opacity: 1;
        }
        .faq-item.active .faq-icon {
            transform: rotate(180deg);
            color: var(--color-gold);
        }

        /* 交互选型指示器高亮 */
        .quiz-option.active {
            border-color: var(--color-gold);
            background: rgba(212, 175, 55, 0.12);
            color: #FFFFFF;
        }

        /* 隐藏滚动条 */
        .no-scrollbar::-webkit-scrollbar {
            display: none;
        }
        .no-scrollbar {
            -ms-overflow-style: none;
            scrollbar-width: none;
        }