body {
  font-family: "Hiragino Sans", "Meiryo", sans-serif;
  background: #f5f5f7;
  margin: 0;
  padding: 40px 16px;
}

.container {
  max-width: 640px;
  margin: 0 auto;
  background: white;
  padding: 32px;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

h1 {
  font-size: 22px;
  margin-bottom: 4px;
}

h2 {
  font-size: 16px;
  margin-top: 28px;
}

form {
  margin-top: 16px;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 12px 0;
}

textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 6px;
  box-sizing: border-box;
  font-family: monospace;
  font-size: 13px;
}

.actions {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

button {
  padding: 10px 16px;
  background: #2d6cdf;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
}

button:disabled {
  background: #9fb6e0;
  cursor: not-allowed;
}

.loading {
  margin-top: 10px;
  color: #2d6cdf;
  font-size: 14px;
}

.flash {
  list-style: none;
  padding: 0;
}

.flash-error {
  color: #c0392b;
}