/* roulang page: index */
:root {
            --bg-base: #070d18;
            --bg-surface: rgba(15, 23, 42, 0.72);
            --border-glass: rgba(255, 255, 255, 0.08);
            --border-glow: rgba(59, 130, 246, 0.35);
            --primary: #1e6fff;
            --primary-glow: rgba(37, 99, 235, 0.45);
        }

        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-base);
            color: #e2e8f0;
        }

        /* 设计网格背景 */
        .blueprint-grid {
            background-image: 
                linear-gradient(to right, rgba(30, 111, 255, 0.04) 1px, transparent 1px),
                linear-gradient(to bottom, rgba(30, 111, 255, 0.04) 1px, transparent 1px);
            background-size: 32px 32px;
        }

        /* 玻璃拟态卡片 */
        .glass-card {
            background: var(--bg-surface);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid var(--border-glass);
            transition: all 0.25s ease-in-out;
        }
        .glass-card:hover {
            border-color: var(--border-glow);
            box-shadow: 0 10px 30px -10px rgba(30, 111, 255, 0.25);
            transform: translateY(-2px);
        }

        /* 发光按钮 */
        .btn-glow {
            background: linear-gradient(135deg, #2563eb, #1e6fff);
            box-shadow: 0 0 20px var(--primary-glow);
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .btn-glow:hover {
            box-shadow: 0 0 28px rgba(37, 99, 235, 0.7);
            transform: translateY(-2px);
        }

        /* 手风琴原生过渡控制 */
        details[open] summary svg {
            transform: rotate(180deg);
        }
        summary {
            list-style: none;
        }
        summary::-webkit-details-marker {
            display: none;
        }

        /* 自定义微滚动条 */
        ::-webkit-scrollbar {
            width: 8px;
        }
        ::-webkit-scrollbar-track {
            background: #070d18;
        }
        ::-webkit-scrollbar-thumb {
            background: #1e293b;
            border-radius: 4px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: #334155;
        }