/* roulang page: index */
:root {
            --bg-deep: #060B18;
            --bg-card: rgba(15, 27, 56, 0.7);
            --bg-card-hover: rgba(20, 36, 75, 0.85);
            --border-glow: rgba(0, 210, 255, 0.25);
            --border-glow-hover: rgba(0, 210, 255, 0.65);
            --neon-blue: #00D2FF;
            --brand-blue: #0066FF;
            --neon-green: #00F5A0;
            --text-main: #FFFFFF;
            --text-sub: #94A3B8;
            --text-dim: #64748B;
        }

        html {
            scroll-behavior: smooth;
            background-color: var(--bg-deep);
            color: var(--text-main);
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
        }

        body {
            overflow-x: hidden;
        }

        /* 玻璃拟态卡片与发光边框 */
        .glass-panel {
            background: var(--bg-card);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glow);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .glass-panel:hover {
            border-color: var(--border-glow-hover);
            box-shadow: 0 10px 30px -10px rgba(0, 210, 255, 0.25);
            background: var(--bg-card-hover);
        }

        /* 发光按钮体系 */
        .btn-glow {
            background: linear-gradient(135deg, #0066FF 0%, #00D2FF 100%);
            box-shadow: 0 0 20px rgba(0, 210, 255, 0.35);
            transition: all 0.3s ease;
        }

        .btn-glow:hover {
            box-shadow: 0 0 28px rgba(0, 210, 255, 0.65);
            transform: translateY(-2px);
        }

        .btn-outline-glow {
            border: 1px solid rgba(0, 210, 255, 0.5);
            color: #00D2FF;
            background: rgba(0, 102, 255, 0.08);
            transition: all 0.3s ease;
        }

        .btn-outline-glow:hover {
            background: rgba(0, 210, 255, 0.18);
            border-color: #00D2FF;
            box-shadow: 0 0 18px rgba(0, 210, 255, 0.3);
            transform: translateY(-2px);
        }

        /* 渐变标题文字 */
        .text-gradient {
            background: linear-gradient(135deg, #FFFFFF 30%, #00D2FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .text-gradient-accent {
            background: linear-gradient(135deg, #00D2FF 0%, #00F5A0 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        /* 自定义手风琴动画 */
        details summary::-webkit-details-marker {
            display: none;
        }
        details[open] summary svg {
            transform: rotate(180deg);
        }