body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f5f5f5;
  color: #333;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  background-color: #4CAF50;
  color: white;
  padding: 16px;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  position: relative;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 32px 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.card {
  background-color: white;
  border-radius: 8px;
  padding: 32px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header h1 {
  color: #FFFFFF;
  margin-top: 0;
  margin-bottom: 1em;
}

h1 {
  color: #4CAF50;
  ;
  margin-top: 0;
  margin-bottom: 1em;
}

h2 {
  color: #388E3C;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
}

p {
  line-height: 1.6;
}

ul {
  line-height: 1.6;
}

a {
  color: #4CAF50;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.form-group {
  margin-bottom: 20px;
  text-align: left;
}

label {
  display: block;
  margin-bottom: 5px;
  font-weight: 500;
}

input {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 16px;
  box-sizing: border-box;
}

.error-text {
  color: #f44336;
  font-size: 14px;
  margin-top: 5px;
  display: none;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  background-color: #4CAF50;
  color: white;
  border: none;
  border-radius: 4px;
  text-decoration: none;
  margin-top: 24px;
  transition: background-color 0.3s;
  font-size: 16px;
  cursor: pointer;
}

.btn-block {
  width: 100%;
}

.btn:hover {
  background-color: #45a049;
}

.disabled {
  background-color: #cccccc;
  cursor: not-allowed;
}

.error {
  color: #f44336;
}

.loading {
  text-align: center;
  padding: 20px;
}

.spinner {
  border: 4px solid rgba(0, 0, 0, 0.1);
  border-left-color: #4CAF50;
  border-radius: 50%;
  width: 30px;
  height: 30px;
  animation: spin 1s linear infinite;
  margin: 20px auto;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

footer {
  text-align: center;
  padding: 16px;
  background-color: #f1f1f1;
  color: #666;
  font-size: 14px;
}

/* 言語切り替え */
.language-selector {
  position: absolute;
  right: 15px;
  top: 15px;
}

/* 非ヘッダー内の言語セレクタ用 */
.container .language-selector {
  position: static;
  margin-bottom: 20px;
}

.language-btn {
  background: transparent;
  border: 1px solid white;
  color: white;
  padding: 5px 10px;
  margin-left: 5px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  transition: background-color 0.3s;
}

.language-btn:hover {
  background-color: rgba(255, 255, 255, 0.2);
}

.language-btn.active {
  background-color: white;
  color: #4CAF50;
}

/* 言語表示制御 */
.lang-ja,
.lang-en {
  display: none;
}

html[lang="ja"] .lang-ja {
  display: block;
}

html[lang="en"] .lang-en {
  display: block;
}

/* インラインテキスト用の言語切り替え */
span.lang-ja,
span.lang-en {
  display: none;
}

html[lang="ja"] span.lang-ja {
  display: inline;
}

html[lang="en"] span.lang-en {
  display: inline;
}

/* アカウント削除ページ用のスタイル */
.step {
  background-color: #f5f5f5;
  border-left: 4px solid #4CAF50;
  padding: 15px;
  margin-bottom: 20px;
  border-radius: 4px;
}

.note {
  background-color: #FFF9C4;
  padding: 15px;
  border-left: 4px solid #FFC107;
  margin: 20px 0;
  border-radius: 4px;
}

.warning {
  background-color: #FFEBEE;
  padding: 15px;
  border-left: 4px solid #F44336;
  margin: 20px 0;
  border-radius: 4px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 20px 0;
  border: 1px solid #ddd;
  border-radius: 4px;
}

/* リスト項目のスタイル改善 */
ul,
ol {
  line-height: 1.6;
  padding-left: 20px;
}

li {
  margin-bottom: 8px;
}

/* 言語表示制御用のリスト対応 */
ul.lang-ja,
ul.lang-en,
ol.lang-ja,
ol.lang-en {
  display: none;
}

html[lang="ja"] ul.lang-ja,
html[lang="ja"] ol.lang-ja {
  display: block;
}

html[lang="en"] ul.lang-en,
html[lang="en"] ol.lang-en {
  display: block;
}

/* 紹介ページ用の追加スタイル */
.app-intro {
  border-left: 4px solid #4CAF50;
  padding-left: 20px;
  margin: 30px 0;
  font-size: 1.1em;
  line-height: 1.8;
}

.download-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
  margin: 30px 0;
}

.download-links .btn {
  min-width: 200px;
  text-align: center;
  padding: 15px 30px;
  font-weight: bold;
  transition: all 0.3s ease;
}

.download-links .btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* アニメーション効果 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  animation: fadeIn 0.8s ease-out;
}

h1,
h2,
.feature-item {
  animation: fadeIn 1s ease-out;
}

/* 特定商取引法ページ用のスタイル */
.transaction-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

.transaction-table th,
.transaction-table td {
  border: 1px solid #ddd;
  padding: 12px;
  text-align: left;
}

.transaction-table th {
  background-color: #f0f9f0;
  font-weight: bold;
  width: 30%;
  color: #2E7D32;
}

.transaction-table td {
  width: 70%;
}

.transaction-table tr:nth-child(even) {
  background-color: #fafafa;
}

@media (max-width: 600px) {

  .transaction-table th,
  .transaction-table td {
    display: block;
    width: 100%;
  }

  .transaction-table th {
    border-bottom: none;
  }
}

/* 戻るリンク */
.return-link {
  margin-top: 30px;
  margin-bottom: 20px;
}

.return-link a {
  color: #4CAF50;
  text-decoration: none;
}

.return-link a:hover {
  text-decoration: underline;
}

/* スクリーンショットギャラリー用スタイル */
.screenshots {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
  margin: 30px 0;
}

.screenshot {
  border: 1px solid #ddd;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
  width: 200px;
}

.screenshot img {
  width: 100%;
  height: auto;
  display: block;
  margin: 0;
  border: none;
  border-radius: 0;
}

/* 機能グリッド */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.feature-item {
  background-color: #f9f9f9;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s;
}

.feature-item:hover {
  transform: translateY(-5px);
}

.feature-item h3 {
  color: #4CAF50;
  margin-top: 0;
}

/* レビューセクション用のスタイル */
.reviews {
  margin: 40px 0;
}

.review {
  background-color: #f9f9f9;
  border-left: 4px solid #4CAF50;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 4px;
}

.review-content {
  font-style: italic;
  margin-bottom: 10px;
}

.review-author {
  font-weight: bold;
  text-align: right;
}

.star-rating {
  color: #FFD700;
  margin-bottom: 10px;
}

/* FAQセクション用のスタイル */
.faq {
  margin: 30px 0;
}

.faq-item {
  margin-bottom: 20px;
  border-bottom: 1px solid #eee;
  padding-bottom: 15px;
}

.faq-question {
  font-weight: bold;
  color: #4CAF50;
  margin-bottom: 10px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-answer {
  padding-left: 10px;
  border-left: 3px solid #4CAF50;
  margin-left: 10px;
}

/* ダウンロードセクション用の改良スタイル */
.download-section {
  background-color: #f0f9f0;
  border-radius: 10px;
  padding: 30px;
  text-align: center;
  margin: 40px 0;
  box-shadow: 0 3px 15px rgba(0, 0, 0, 0.1);
}

.download-section h2 {
  color: #2E7D32;
  margin-top: 0;
}

.store-badges {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 25px;
  flex-wrap: wrap;
}

.store-badge {
  transition: transform 0.3s;
  max-width: 180px;
}

.store-badge:hover {
  transform: scale(1.05);
}

.store-badge img {
  width: 100%;
  height: auto;
  border: none;
  margin: 0;
}

/* フッターリンクのスタイル */
.footer-links {
  text-align: center;
  margin-bottom: 10px;
}

.footer-links a {
  color: #4CAF50;
  text-decoration: none;
  padding: 0 10px;
}

.footer-links a:hover {
  text-decoration: underline;
}

/* レスポンシブ調整 */
@media (max-width: 600px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .store-badges {
    flex-direction: column;
    align-items: center;
  }
}

/* ダークモード対応 */
@media (prefers-color-scheme: dark) {
  body {
    background-color: #222;
    color: #eee;
  }

  .card {
    background-color: #333;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  }

  h1 {
    color: #6DCF73;
  }

  h2 {
    color: #5ABF5F;
  }

  a {
    color: #6DCF73;
  }

  .feature-item {
    background-color: #2a2a2a;
  }

  .feature-item h3 {
    color: #6DCF73;
  }

  .transaction-table th {
    background-color: #2a3a2a;
    color: #6DCF73;
  }

  .transaction-table tr:nth-child(even) {
    background-color: #3a3a3a;
  }

  .review {
    background-color: #2a2a2a;
    border-left: 4px solid #6DCF73;
  }

  .download-section {
    background-color: #2a3a2a;
  }

  .download-section h2 {
    color: #6DCF73;
  }

  .faq-question {
    color: #6DCF73;
  }

  .faq-answer {
    border-left: 3px solid #6DCF73;
  }

  .footer-links a {
    color: #6DCF73;
  }
}