/* ベーススタイル */
body {
  font-family: 'Noto Sans JP', sans-serif;
  background-color: #f5f5f5;
  margin: 0;
  padding: 2rem;
}

/* セクション全体のレイアウト */
.form-section {
  width: 50%;
  max-width: 520px;
  margin: 0 auto;
  background-color: #fff;
  padding: 2.5rem 2rem;
  border-radius: 8px;
  box-shadow: 0 0 16px rgba(0, 0, 0, 0.05);
}

@media (max-width: 575.98px) {
  .form-section {
    width: 100%;
    padding: 1.5rem 1rem;
    margin: 1rem auto;
  }

  .contact-form input,
  .contact-form select,
  .contact-form textarea {
    width: 90%;
    max-width: 100%;
  }
}

/* フォームタイトル */
.form-title {
  text-align: center;
  font-size: 1.8rem;
  font-weight: bold;
  margin-bottom: 2rem;
  color: #222;
}

/* フォーム要素の整列 */
.contact-form .form-group {
  text-align: center;
  margin-bottom: 1.4rem;
}

.contact-form label {
  display: block;
  width: 90%;
  max-width: 500px;
  margin: 0 auto 0.4rem auto;
  text-align: left;
  font-weight: 600;
  font-size: 1rem;
  color: #333;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
  padding: 0.7rem 0.8rem;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
  display: block;
}

.contact-form input:focus,
.contact-form textarea:focus,
.contact-form select:focus {
  outline: none;
  border-color: #0dcaf0;
  box-shadow: 0 0 0 2px rgba(13, 202, 240, 0.2);
}

/* 講習希望フィールドのボックス */
#lesson-fields {
  padding: 1rem;
  margin-top: 1rem;
  background-color: #f1faff;
  border-left: 4px solid #0dcaf0;
  border-radius: 4px;
}

/* カレンダー関連 */
.datepicker-wrapper {
  position: relative;
  display: inline-block;
}

.datepicker-container {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 1000;
}

.datepicker-btn {
  background-color: #2c3e50;
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
  transition: background-color 0.3s ease;
}

.datepicker-btn:hover {
  background-color: #1a252f;
}

/* 送信ボタン */
.submit-btn {
  display: inline-block;
  width: auto;
  padding: 0.7rem 1.8rem;
  background-color: #0dcaf0;
  color: white;
  font-weight: bold;
  font-size: 1.05rem;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: background-color 0.3s ease;
  margin: 2rem auto 0;
  text-align: center;
}

.submit-btn:hover {
  background-color: #31d2f2;
}

/* ボタン配置 */
.contact-form .button-group {
  max-width: 500px;
  margin: 2rem auto 0 auto;
  text-align: right;
}

/* 送信完了メッセージ */
.thanks-message {
  max-width: 520px;
  margin: 3rem auto;
  padding: 2.5rem;
  background-color: #e6fcff;
  border-left: 6px solid #0dcaf0;
  border-radius: 6px;
  color: #333;
  font-size: 1.1rem;
  text-align: center;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.05);
}

/* Instagramボタン */
.instagram-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 107%, #fdf497 0%, #fdf497 5%, #fd5949 45%, #d6249f 60%, #285AEB 90%);
  color: white;
  font-size: 24px;
  text-decoration: none;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.instagram-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* エラーメッセージ */
.error-message {
  color: red;
  font-size: 0.9rem;
  margin-top: 0.3rem;
  display: none;
}