/* roulang page: index */
:root {
            --primary-glow: #00F2FE;
            --secondary-glow: #4FACFE;
            --bg-base: #0A0F1D;
            --card-base: rgba(17, 24, 39, 0.75);
            --border-glow: rgba(0, 242, 254, 0.2);
            --text-title: #F8FAFC;
            --text-body: #94A3B8;
        }

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

        .glass-card {
            background: var(--card-base);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-glow);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .glass-card:hover {
            border-color: rgba(0, 242, 254, 0.5);
            box-shadow: 0 0 25px rgba(0, 242, 254, 0.15);
            transform: translateY(-3px);
        }

        .gradient-text {
            background: linear-gradient(135deg, #FFFFFF 20%, #00F2FE 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .btn-glow {
            background: linear-gradient(135deg, #00F2FE 0%, #4FACFE 100%);
            box-shadow: 0 0 15px rgba(0, 242, 254, 0.4);
            transition: all 0.3s ease;
        }

        .btn-glow:hover {
            box-shadow: 0 0 25px rgba(0, 242, 254, 0.7);
            transform: scale(1.02);
        }

        /* 手风琴平滑展开 */
        .faq-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out, padding 0.35s ease;
        }
        .faq-content.open {
            max-height: 350px;
            padding-bottom: 1.25rem;
        }