/* すでに提供済みの button/input submit スタイル */
button,
input[type="submit"] {
  margin-top: 24px;
  padding: 12px;
  background-color: #3b82f6;
  color: white;
  font-size: 16px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s;
  width: 100%;
  max-width: 100%;
}

button:hover,
input[type="submit"]:hover {
  background-color: #2563eb;
}

/* ヘッダー・フッター中央寄せ修正 */
.site-header {
  background-color: #ffffff;
  padding: 12px 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.06);
  text-align: center;
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
}

.logo {
  max-height: 50px;
}

.site-footer {
  background-color: #f3f4f6;
  padding: 20px 0;
  text-align: center;
  font-size: 14px;
  color: #6b7280;
  line-height: 1.6;
}

.footer-inner {
  max-width: 960px;
  margin: 0 auto;
}