:root{--bg: #fafafa;--fg: #1a1a1a;--muted: #666;--border: #e5e5e5;--primary: #5b8dee;--danger: #d33;--success: #3a8}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,sans-serif;background:var(--bg);color:var(--fg)}.app{display:flex;flex-direction:column;min-height:100vh}