/* roulang page: index */
:root {
            --bg-deep: #0A0D14;
            --bg-card: #121722;
            --bg-surface: #1E2536;
            --accent-cyan: #00F2FE;
            --accent-red: #FF4655;
            --text-main: #F8FAFC;
            --text-sub: #94A3B8;
            --border-glow: rgba(0, 242, 254, 0.2);
            --border-dim: rgba(255, 255, 255, 0.08);
        }

        body {
            background-color: var(--bg-deep);
            color: var(--text-main);
            font-family: 'system-ui', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            overflow-x: hidden;
        }

        /* 战术切角与微弱内光描边 */
        .tactical-border {
            border: 1px solid var(--border-dim);
            background: linear-gradient(180deg, rgba(26, 34, 51, 0.6) 0%, rgba(18, 23, 34, 0.9) 100%);
            backdrop-filter: blur(10px);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .tactical-border:hover {
            border-color: rgba(0, 242, 254, 0.45);
            box-shadow: 0 10px 30px -10px rgba(0, 242, 254, 0.2);
            transform: translateY(-2px);
        }

        .tactical-badge {
            background: rgba(0, 242, 254, 0.08);
            border: 1px solid rgba(0, 242, 254, 0.3);
            color: var(--accent-cyan);
        }

        .tactical-btn-primary {
            background-color: var(--accent-red);
            color: #FFFFFF;
            transition: all 0.2s ease;
            position: relative;
            overflow: hidden;
        }
        .tactical-btn-primary:hover {
            box-shadow: 0 0 25px rgba(255, 70, 85, 0.5);
            transform: translateY(-1px);
        }

        .tactical-btn-outline {
            border: 1px solid var(--accent-cyan);
            color: var(--accent-cyan);
            background: transparent;
            transition: all 0.2s ease;
        }
        .tactical-btn-outline:hover {
            background: rgba(0, 242, 254, 0.12);
            box-shadow: 0 0 20px rgba(0, 242, 254, 0.3);
        }

        /* 网格背景图层 */
        .bg-grid-pattern {
            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);
        }

        /* 流程连线动画 */
        .step-node::after {
            content: '';
            position: absolute;
            top: 50%;
            right: -2rem;
            width: 2rem;
            height: 2px;
            background: linear-gradient(90deg, #00F2FE, transparent);
            display: none;
        }
        @media (min-width: 1024px) {
            .step-node:not(:last-child)::after {
                display: block;
            }
        }

        /* 原生手风琴控制 */
        .faq-item.active .faq-answer {
            max-height: 300px;
            opacity: 1;
            padding-top: 1rem;
        }
        .faq-item .faq-answer {
            max-height: 0;
            opacity: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, opacity 0.3s ease, padding 0.35s ease;
        }
        .faq-item.active .faq-icon {
            transform: rotate(180deg);
            color: var(--accent-cyan);
        }