:root{--ds-color-text:#1f2937;--ds-color-bg:#f8fafc;--ds-color-accent:#1d4ed8;--ds-space-2:.5rem;--ds-space-4:1rem;--ds-radius-md:.5rem;--ds-font-family-sans:Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif}body{background:var(--ds-color-bg);color:var(--ds-color-text);font-family:var(--ds-font-family-sans);flex-direction:column;height:100vh;display:flex}header.site-header{flex-shrink:0}main.app-shell{flex-grow:1}footer.site-footer{flex-shrink:0}.ds-card{border-radius:var(--ds-radius-md);padding:var(--ds-space-4);background:#fff;border:1px solid #d1d5db}.ds-button{background:var(--ds-color-accent);color:#fff;border-radius:var(--ds-radius-md);padding:var(--ds-space-2) var(--ds-space-4);cursor:pointer;border:0}