:root { --w: 720px; }
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,"Hiragino Kaku Gothic ProN","Meiryo",sans-serif;
     max-width:var(--w);margin:36px auto;padding:0 16px;line-height:1.7}
h1{margin:0 0 12px}
section{border:1px solid #e5e5e5;border-radius:12px;padding:16px;margin:16px 0}
section>h2{font-size:16px;margin:0 0 12px;color:#333}
label{display:block;font-size:14px;margin:8px 0 4px}
input,select,textarea,button{font-size:16px}
input[type="text"],input[type="number"],select,textarea{
  width:100%;padding:10px;border:1px solid #ccc;border-radius:10px;box-sizing:border-box
}
.row{display:flex;gap:12px;flex-wrap:wrap}
.row>*{flex:1 1 220px}
.note{font-size:12px;color:#666}
.pill{display:inline-block;background:#f6f7fb;border:1px solid #e5e7f0;border-radius:999px;padding:2px 8px}
#colorBox{height:40px;border-radius:10px;border:1px solid #ddd}
#preview{max-width:100%;display:block;border:1px dashed #bbb;border-radius:8px;margin-top:8px}
#result{font-weight:600}
ul{margin:8px 0 0 20px}
code{background:#f5f5f5;padding:2px 6px;border-radius:6px}