/* roulang page: index */
:root {
            --bg-primary: #0a0f1d;
            --bg-secondary: #0d1527;
            --card-glass: rgba(16, 24, 48, 0.72);
            --card-border: rgba(255, 255, 255, 0.08);
            --text-main: #f8fafc;
            --text-muted: #94a3b8;
            --accent-cyan: #00f2fe;
            --accent-green: #00f5a0;
            --glow-cyan: rgba(0, 242, 254, 0.45);
        }

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

        body {
            background-color: var(--bg-primary);
            color: var(--text-main);
            font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
            overflow-x: hidden;
            line-height: 1.6;
        }

        /* 玻璃拟态卡片系统 */
        .glass-panel {
            background: var(--card-glass);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border: 1px solid var(--card-border);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
        }

        .glass-card-interactive {
            background: var(--card-glass);
            backdrop-filter: blur(14px);
            border: 1px solid var(--card-border);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .glass-card-interactive:hover {
            border-color: rgba(0, 242, 254, 0.35);
            transform: translateY(-4px);
            box-shadow: 0 15px 35px rgba(0, 242, 254, 0.12);
        }

        /* 发光按钮系统 */
        .btn-glow-cyan {
            background: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
            color: #050a14;
            font-weight: 600;
            transition: all 0.25s ease;
            box-shadow: 0 4px 15px rgba(0, 242, 254, 0.25);
        }

        .btn-glow-cyan:hover {
            box-shadow: 0 0 25px rgba(0, 242, 254, 0.6);
            transform: translateY(-2px);
        }

        .btn-glass {
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: #ffffff;
            transition: all 0.25s ease;
        }

        .btn-glass:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            transform: translateY(-2px);
        }

        /* 渐变文本 */
        .text-gradient-cyan {
            background: linear-gradient(135deg, #ffffff 20%, #00f2fe 70%, #00f5a0 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .text-gradient-green {
            background: linear-gradient(135deg, #00f5a0 0%, #00f2fe 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        /* 脉冲微动画 */
        @keyframes pulse-subtle {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.85; transform: scale(1.02); }
        }
        .animate-subtle-pulse {
            animation: pulse-subtle 4s ease-in-out infinite;
        }

        /* FAQ 手风琴动画 */
        .faq-content {
            transition: max-height 0.35s ease, opacity 0.35s ease;
            max-height: 0;
            overflow: hidden;
            opacity: 0;
        }
        .faq-item.active .faq-content {
            max-height: 400px;
            opacity: 1;
        }
        .faq-icon {
            transition: transform 0.3s ease;
        }
        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }

        /* 背景装饰微光 */
        .glow-sphere {
            position: absolute;
            width: 450px;
            height: 450px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(0, 242, 254, 0.12) 0%, rgba(10, 15, 29, 0) 70%);
            pointer-events: none;
            z-index: 0;
        }