:root{color-scheme:light dark}body{font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,Noto Sans;line-height:1.5}a{color:#2563eb;text-decoration:none}button{padding:8px 12px;background:#111827;color:#fff}button,input{border:1px solid #e5e7eb;border-radius:6px}input{padding:8px 10px}