{"id":"css-unit-converter","engine":"core","category":"converter","name":"CSS px・rem・em 換算","fields":[{"key":"value","label":"値","type":"number","default":24,"required":true},{"key":"base","label":"基準値・基数 (px)","type":"number","default":16,"required":true,"min":0.000001},{"key":"mode","label":"処理方式","type":"select","default":"px-rem","options":[{"value":"px-rem","label":"px → rem / em"},{"value":"rem-px","label":"rem / em → px"}]}],"sample":{"value":24,"base":16,"mode":"px-rem"}}