:root{--color-primary: #3b5bdb;--color-bg: #f8f9fa;--color-text: #212529;--color-muted: #868e96;--color-border: #dee2e6}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--color-bg);color:var(--color-text)}button{font:inherit;cursor:pointer}