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.m-nav,.m-header.open .m-actions{display:flex;flex-direction:column;align-items:stretch;flex:1 0 100%;background:#fff;border:1px solid var(--line);border-radius:14px;padding:8px}.sidebar{display:none}.app-top{display:flex}.app-shell.nav-open .sidebar{display:flex;position:fixed;inset:0 auto 0 0;z-index:30;width:min(280px,86vw);box-shadow:var(--shadow-hover)}.app-main{padding:20px 16px 48px}}@media(max-width:640px){.kpi-row,.metrics,.grid-3,.grid-2,.mock-cols,.config-grid,.infra-layout,.detail-grid{grid-template-columns:1fr}.m-footer{flex-direction:column}h1{font-size:2.3rem}}