/* 基本設定 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: #f4f6f8;
  color: #333;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

/* ログインカード */
.login {
  background: #ffffff;
  width: 100%;
  max-width: 400px;
  padding: 32px 24px;
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.login h2 {
  font-size: 24px;
  text-align: center;
  margin-bottom: 24px;
  color: #1a1a1a;
}

/* フォーム要素 */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form-label {
  font-size: 14px;
  font-weight: 600;
  color: #4a5568;
  margin-top: 12px;
}

.form-label:first-child {
  margin-top: 0;
}

.form-control {
  width: 100%;
  padding: 12px 14px;
  font-size: 16px;
  border: 1px solid #cbd5e0;
  border-radius: 6px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: #3182ce;
  box-shadow: 0 0 0 3px rgba(49, 130, 206, 0.2);
}

/* エラーメッセージ */
#error-message {
  display: none;
  color: #e53e3e;
  background-color: #fff5f5;
  border: 1px solid #fed7d7;
  border-radius: 6px;
  padding: 10px;
  font-size: 14px;
  margin-top: 16px;
  text-align: center;
}

/* ログインボタン */
.btn-login {
  width: 100%;
  margin-top: 24px;
  padding: 12px;
  background-color: #3182ce;
  color: #ffffff;
  border: none;
  border-radius: 6px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.2s;
}

.btn-login:hover {
  background-color: #2b6cb0;
}

/* お知らせエリア */
.notice {
  width: 100%;
  max-width: 400px;
  margin-top: 20px;
  padding: 16px;
  background-color: #ebf8ff;
  border: 1px solid #bee3f8;
  border-radius: 8px;
  color: #2b6cb0;
  font-size: 13px;
  line-height: 1.6;
}