/* roulang page: index */
:root {
            --bg-deep: #070B14;
            --bg-card: rgba(15, 23, 42, 0.65);
            --bg-card-hover: rgba(30, 41, 59, 0.75);
            --border-glass: rgba(255, 255, 255, 0.08);
            --border-highlight: rgba(0, 240, 255, 0.3);
            --primary-cyan: #00F0FF;
            --primary-blue: #2563EB;
            --accent-gold: #F59E0B;
            --text-main: #FFFFFF;
            --text-muted: #94A3B8;
            --text-dim: #64748B;
        }

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

        body {
            background-color: var(--bg-deep);
            color: var(--text-main);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            line-height: 1.7;
            letter-spacing: 0.02em;
            overflow-x: hidden;
            background-image: 
                radial-gradient(circle at 15% 10%, rgba(37, 99, 235, 0.12) 0%, transparent 40%),
                radial-gradient(circle at 85% 60%, rgba(0, 240, 255, 0.08) 0%, transparent 40%),
                radial-gradient(circle at 50% 90%, rgba(13, 27, 42, 0.7) 0%, transparent 60%);
            background-attachment: fixed;
        }

        /* 玻璃拟态卡片 */
        .glass-card {
            background: var(--bg-card);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glass);
            border-top: 1px solid rgba(0, 240, 255, 0.22);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .glass-card:hover {
            background: var(--bg-card-hover);
            border-color: rgba(0, 240, 255, 0.35);
            transform: translateY(-4px);
            box-shadow: 0 16px 32px -8px rgba(0, 240, 255, 0.12);
        }

        /* 发光按钮 */
        .btn-glow-primary {
            background: linear-gradient(135deg, #00F0FF 0%, #2563EB 100%);
            color: #070B14;
            font-weight: 700;
            box-shadow: 0 0 24px rgba(0, 240, 255, 0.45);
            transition: all 0.25s ease;
            position: relative;
            overflow: hidden;
        }

        .btn-glow-primary:hover {
            box-shadow: 0 0 35px rgba(0, 240, 255, 0.75);
            transform: translateY(-2px);
            color: #000000;
        }

        .btn-glow-secondary {
            background: rgba(15, 23, 42, 0.7);
            border: 1px solid rgba(0, 240, 255, 0.45);
            color: #00F0FF;
            transition: all 0.25s ease;
            backdrop-filter: blur(8px);
        }

        .btn-glow-secondary:hover {
            background: rgba(0, 240, 255, 0.15);
            border-color: #00F0FF;
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
            transform: translateY(-2px);
        }

        /* 呼吸光点 */
        .status-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background-color: #10B981;
            box-shadow: 0 0 10px #10B981;
            animation: pulse-dot 2s infinite;
        }

        @keyframes pulse-dot {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.4; transform: scale(0.85); }
        }

        /* 标题科技渐变高光 */
        .tech-gradient-text {
            background: linear-gradient(135deg, #FFFFFF 20%, #00F0FF 80%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        /* FAQ 手风琴展开动效 */
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease-out, opacity 0.3s ease;
            opacity: 0;
        }

        .faq-item.active .faq-answer {
            max-height: 300px;
            opacity: 1;
        }

        .faq-item.active .faq-icon {
            transform: rotate(180deg);
            color: var(--primary-cyan);
        }

        /* 统一 Section 间距 */
        section {
            padding: 5.5rem 1rem;
            position: relative;
        }

        @media (max-width: 768px) {
            section {
                padding: 3.5rem 1rem;
            }
        }