/* roulang page: index */
:root {
            --brand-navy: #0F2C59;
            --brand-blue: #0066FF;
            --brand-cyan: #00B4D8;
            --bg-light: #F8FAFC;
            --bg-subtle: #F0F4F8;
            --text-main: #1E293B;
            --text-sub: #64748B;
            --card-radius: 12px;
            --shadow-base: 0 4px 20px -2px rgba(15, 44, 89, 0.06);
            --shadow-hover: 0 12px 28px -4px rgba(0, 102, 255, 0.12);
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            color: var(--text-main);
            background-color: var(--bg-light);
            scroll-behavior: smooth;
        }

        .custom-card-shadow {
            box-shadow: var(--shadow-base);
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .custom-card-shadow:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .nav-blur {
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
        }

        /* 隐藏原生手风琴箭头 */
        details > summary::-webkit-details-marker {
            display: none;
        }