body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans JP", Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  margin: 0;
  background: #f6f7f9;
  color: #111;
}
header {
  padding: 16px;
  background: #ffffff;
  position: sticky;
  top: 0;
  z-index: 1;
  box-shadow: 0 1px 0 rgba(0,0,0,0.06);
}
h1 {
  margin: 0 0 4px 0;
  font-size: 18px;
}
.container {
  padding: 16px;
  display: grid;
  gap: 16px;
}
.panel {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 12px;
}
.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}
@media (min-width: 840px) {
  .grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
}
textarea {
  width: 100%;
  min-height: 220px;
  resize: vertical;
  font-size: 16px;
  padding: 12px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  box-sizing: border-box;
}
label {
  font-size: 12px;
  color: #374151;
  display: block;
  margin-bottom: 6px;
}
.row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
input[type="number"], input[type="text"], input[type="color"], select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 14px;
  box-sizing: border-box;
  background: #fff;
}
.actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
button {
  cursor: pointer;
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid #111827;
  background: #111827;
  color: #fff;
  font-weight: 600;
}
button.secondary {
  background: #fff;
  color: #111827;
}
.preview {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  overflow: hidden;
}
.card img {
  display: block;
  width: 100%;
  height: auto;
  background: #fff;
}
.card .card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px;
  font-size: 12px;
}
.note {
  font-size: 12px;
  color: #6b7280;
}