:root{--color-primary: #2563eb;--color-fg: #0f172a;--color-bg: #f8fafc;--color-card: #ffffff;--color-border: #e2e8f0;--color-muted: #64748b}*{box-sizing:border-box}body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;background:var(--color-bg);color:var(--color-fg)}button{font:inherit;cursor:pointer}