/* roulang page: index */
:root {
            --bg-dark: #0D1117;
            --bg-card: #161B22;
            --bg-elevated: #1F242C;
            --brand-purple: #7928CA;
            --brand-cyan: #00DFD8;
            --text-heading: #F0F6FC;
            --text-body: #C9D1D9;
            --text-dim: #8B949E;
            --border-dim: rgba(255, 255, 255, 0.08);
            --border-highlight: rgba(0, 223, 216, 0.3);
        }

        body {
            background-color: var(--bg-dark);
            color: var(--text-body);
            font-family: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            line-height: 1.75;
            overflow-x: hidden;
        }

        .gradient-brand {
            background: linear-gradient(135deg, #7928CA 0%, #00DFD8 100%);
        }

        .gradient-brand-text {
            background: linear-gradient(135deg, #A855F7 0%, #00DFD8 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .glass-panel {
            background: rgba(22, 27, 34, 0.85);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border-dim);
        }

        .glass-panel:hover {
            border-color: rgba(0, 223, 216, 0.25);
            box-shadow: 0 8px 30px rgba(0, 223, 216, 0.08);
            transform: translateY(-2px);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .hero-banner {
            background-image: linear-gradient(to bottom, rgba(13, 17, 23, 0.75), rgba(13, 17, 23, 0.96)), url('/assets/images/f88d1b76c4435e68.webp');
            background-size: cover;
            background-position: center;
        }

        .spec-bg {
            background-image: linear-gradient(to right, rgba(13, 17, 23, 0.95), rgba(22, 27, 34, 0.92)), url('/assets/images/4d9851995739550c.png');
            background-size: cover;
            background-position: center;
        }

        .radar-card {
            background: radial-gradient(circle at top left, rgba(121, 40, 202, 0.15), transparent 70%), #161B22;
        }

        /* 隐藏原生滚动条并平滑滚动 */
        html {
            scroll-behavior: smooth;
        }

        /* 手风琴动效 */
        .faq-content {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out;
        }
        .faq-open .faq-content {
            max-height: 240px;
        }
        .faq-open .faq-arrow {
            transform: rotate(180deg);
        }