body{
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Hiragino Kaku Gothic ProN", "Noto Sans JP";
  padding:16px; max-width:900px; margin:auto;
}
h1{font-size:18px}
.card{
  background:#fff; border-radius:8px; padding:14px; margin:12px 0;
  box-shadow:0 2px 8px rgba(0,0,0,0.06)
}
label{display:block; margin:8px 0; font-weight:600}
input[type="file"]{display:block}
textarea{width:100%; height:80px}
button{margin:6px 4px; padding:8px 12px}
.small{font-size:12px; color:#555}
img#preview{max-width:100%; border:1px solid #ddd; padding:6px; border-radius:6px; margin-top:8px}