/* roulang page: index */
:root {
            --bg-main: #0B0F19;
            --card-main: #111827;
            --brand-purple: #7C3AED;
            --brand-deep: #5B21B6;
            --neon-cyan: #06B6D4;
            --crit-red: #F43F5E;
            --text-pure: #F9FAFB;
            --text-muted: #9CA3AF;
            --border-glass: rgba(255, 255, 255, 0.08);
            --border-purple: rgba(124, 58, 237, 0.4);
        }

        html {
            scroll-behavior: smooth;
        }

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

        .glass-card {
            background: rgba(17, 24, 39, 0.75);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: 1.25rem;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .glass-card:hover {
            transform: translateY(-4px);
            border-color: var(--border-purple);
            box-shadow: 0 20px 40px -15px rgba(124, 58, 237, 0.25);
        }

        .gradient-purple-banner {
            background: linear-gradient(135deg, #1e1b4b 0%, #311042 50%, #0f172a 100%);
        }

        .badge-pill {
            background: linear-gradient(90deg, rgba(124, 58, 237, 0.15) 0%, rgba(6, 182, 212, 0.15) 100%);
            border: 1px solid rgba(124, 58, 237, 0.3);
            border-radius: 9999px;
            padding: 0.35rem 0.85rem;
        }

        .text-glow {
            text-shadow: 0 0 20px rgba(124, 58, 237, 0.4);
        }

        /* 手风琴平滑展示 */
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out, padding 0.35s ease-out;
        }
        .faq-item.active .faq-answer {
            max-height: 200px;
            padding-top: 0.75rem;
        }
        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }

        /* 浮动底栏防遮挡留白 */
        .pb-float-cta {
            padding-bottom: 5.5rem;
        }