body {
  font-family: sans-serif;
  background-color: #e8f0fc; /* サイボウズ風の薄青背景 */
  margin: 0;
  padding: 40px;
}

.login-box {
  width: 420px;
  margin: 0 auto;
  background-color: #dfeeff;  /* ← サイボウズ風ブルーに変更！ */
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
  text-align: center;
}

.login-box h2 {
  margin-bottom: 25px;
}

.login-table {
  margin: 0 auto;
  border-collapse: collapse;
}

.login-table td {
  padding: 12px;
  vertical-align: middle;
}

.label-cell {
  text-align: right;
  padding-right: 10px;
  font-weight: bold;
  white-space: nowrap;
}

.input-cell {
  text-align: left;
  width: 220px;
}

input[type="password"],
select {
  width: 100%;
  padding: 8px;
  box-sizing: border-box;
  font-size: 14px;
}

.center-button {
  text-align: center;
  padding-top: 15px;
}

button[type="submit"] {
  padding: 10px 30px;
  font-size: 16px;
  cursor: pointer;
}

.rules {
  margin-top: 50px;
  text-align: center;
}

.rules h3 {
  margin-bottom: 10px;
}

.rules .keyword {
  font-weight: bold;
  color: #007bff;
}

.error {
  color: red;
  font-weight: bold;
  margin-top: 10px;
}