/* ビューポート高さ変数（iOS対応） */
:root {
  --vh: 1vh;
  --gold-primary: #c9b372;
  --gold-light: #e6d399;
  --gold-dark: #a18c4f;
  --dark-primary: #1a1a2e;
  --dark-secondary: #16213e;
}

/* チャットコンテナ */
.chat-container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  background: linear-gradient(135deg, #2a2a3a 0%, #1a1a2e 100%);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  border-radius: 16px;
  margin-top: 20px;
  display: none; /* 初期状態は非表示 */
  opacity: 0; /* フェードイン用 */
  transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  border: 1px solid rgba(201, 179, 114, 0.1);
  overflow: hidden;
  position: relative;
}

.chat-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--gold-primary), var(--gold-light), var(--gold-primary));
  z-index: 10;
}

.chat-container.visible {
  display: block;
  opacity: 1;
  transform: translateY(0);
  animation: fadeIn 0.5s ease-out;
  min-height: calc(var(--vh, 1vh) * 100 - 20px);
  height: auto;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* チャットヘッダー */
.chat-header {
  position: sticky;
  top: 0;
  background: rgba(30, 30, 45, 0.9);
  padding: 15px;
  border-bottom: 1px solid rgba(201, 179, 114, 0.1);
  z-index: 100;
  display: flex;
  justify-content: center;
  align-items: center;
  backdrop-filter: blur(10px);
  border-radius: 12px 12px 0 0;
}

/* チャットフッター */
.chat-footer {
  padding: 20px;
  background: rgba(30, 30, 45, 0.9);
  border-top: 1px solid rgba(201, 179, 114, 0.1);
  margin-top: 0;
  border-radius: 0 0 12px 12px;
  backdrop-filter: blur(10px);
  position: sticky;
  bottom: 0;
  z-index: 50;
}

/* 他のキャラクターとの会話切り替えエリア */
.character-selection {
  display: flex;
  flex-direction: column;
  margin-top: 15px;
  gap: 10px;
}

.character-selection-label {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  text-align: center;
}

.character-selection-thumbnails {
  display: flex;
  justify-content: center;
  gap: 10px;
}

.character-selection-thumb {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: contain;
  cursor: pointer;
  transition: all 0.3s ease;
  background-color: rgba(20, 20, 30, 0.8);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(201, 179, 114, 0.3);
  padding: 2px;
}

.character-selection-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 12px rgba(201, 179, 114, 0.4);
}

.character-switcher {
  text-align: center;
  margin-bottom: 20px;
}

.character-switcher p {
  margin-bottom: 15px;
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 500;
}

.character-thumbnails {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-bottom: 20px;
  flex-wrap: wrap; /* フレックスアイテムが折り返せるように */
}

.character-thumb {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  object-fit: contain;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.3s ease;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  background-color: rgba(20, 20, 30, 0.8);
  padding: 5px;
}

.character-thumb:hover {
  transform: scale(1.1) translateY(-5px);
  border-color: var(--gold-primary);
  box-shadow: 0 6px 15px rgba(201, 179, 114, 0.4);
}

.character-thumb.active {
  border-color: var(--gold-primary);
  box-shadow: 0 0 15px rgba(201, 179, 114, 0.6);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(201, 179, 114, 0.4);
  }
  70% {
    box-shadow: 0 0 0 10px rgba(201, 179, 114, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(201, 179, 114, 0);
  }
}

/* 戻るボタン */
.back-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 15px;
  background: linear-gradient(135deg, var(--gold-dark) 0%, var(--gold-primary) 100%);
  color: #fff;
  border: none;
  border-radius: 25px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 14px;
  text-align: center;
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 1px;
  box-shadow: 0 4px 15px rgba(201, 179, 114, 0.3);
  position: relative;
  overflow: hidden;
}

.back-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: all 0.5s ease;
}

.back-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(201, 179, 114, 0.4);
}

.back-button:hover::before {
  left: 100%;
}

.back-button .btn-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#selected-character {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  object-fit: contain;
  border: 3px solid var(--gold-primary);
  box-shadow: 0 0 15px rgba(201, 179, 114, 0.5);
  transition: all 0.3s ease;
  background-color: rgba(20, 20, 30, 0.8);
  padding: 5px;
}

#selected-character:hover {
  transform: scale(1.05);
  box-shadow: 0 0 20px rgba(201, 179, 114, 0.7);
}

/* チャットメッセージエリア */
.chat-messages {
  min-height: 400px;
  max-height: 600px;
  overflow-y: auto;
  padding: 20px;
  background: rgba(20, 20, 30, 0.5);
  border-radius: 0 0 12px 12px;
  scrollbar-width: thin;
  scrollbar-color: var(--gold-primary) #2a2a3a;
  -webkit-overflow-scrolling: touch; /* iOSのスクロール最適化 */
}

.chat-messages::-webkit-scrollbar {
  width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
  background: #2a2a3a;
  border-radius: 10px;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: var(--gold-primary);
  border-radius: 10px;
}

.message {
  margin-bottom: 20px;
  display: flex;
  align-items: flex-start;
  animation: messageAppear 0.3s ease-out;
  width: 100%;
  position: relative;
}

@keyframes messageAppear {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message.user {
  justify-content: flex-end;
}

.message-content {
  padding: 12px 18px;
  border-radius: 18px;
  max-width: 80%;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  line-height: 1.5;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.bot-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  margin-right: 8px;
  flex-shrink: 0;
  object-fit: cover;
  background-color: rgba(20, 20, 30, 0.8);
  border: 2px solid var(--gold-primary);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.message.bot .message-content {
  background: linear-gradient(135deg, rgba(26, 26, 46, 0.9) 0%, rgba(22, 33, 62, 0.9) 100%);
  border-top-left-radius: 4px;
  border: 1px solid rgba(201, 179, 114, 0.1);
}

.message.user .message-content {
  background: linear-gradient(135deg, rgba(201, 179, 114, 0.2) 0%, rgba(201, 179, 114, 0.3) 100%);
  color: #fff;
  border-top-right-radius: 4px;
  text-align: right;
  border: 1px solid rgba(201, 179, 114, 0.2);
}

/* チャット入力エリア */
.chat-input {
  display: flex;
  padding: 15px;
  gap: 10px;
  background: rgba(30, 30, 45, 0.5);
  position: relative;
}

.chat-input textarea {
  flex: 1;
  padding: 12px 18px;
  border: 1px solid rgba(201, 179, 114, 0.1);
  border-radius: 25px;
  background: rgba(20, 20, 30, 0.5);
  color: #fff;
  font-size: 16px; /* iOSで拡大されないサイズ */
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  letter-spacing: 0.5px;
  resize: none;
  min-height: 40px;
  max-height: 120px;
  overflow-y: auto;
  font-family: inherit;
  line-height: 1.5;
  -webkit-appearance: none; /* iOSのデフォルトスタイルを削除 */
}

.chat-input textarea:focus {
  outline: none;
  border-color: var(--gold-primary);
  box-shadow: 0 0 10px rgba(201, 179, 114, 0.3);
  background: rgba(20, 20, 30, 0.7);
}

.chat-input textarea::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

/* 以下のセレクタは残しておく（旧コードとの互換性のため） */
.chat-input input {
  flex: 1;
  padding: 12px 18px;
  border: 1px solid rgba(201, 179, 114, 0.1);
  border-radius: 25px;
  background: rgba(20, 20, 30, 0.5);
  color: #fff;
  font-size: 16px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  letter-spacing: 0.5px;
}

.chat-input input:focus {
  outline: none;
  border-color: var(--gold-primary);
  box-shadow: 0 0 10px rgba(201, 179, 114, 0.3);
  background: rgba(20, 20, 30, 0.7);
}

.chat-input input::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

.chat-input button {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--gold-dark) 0%, var(--gold-primary) 100%);
  color: #fff;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 4px 10px rgba(201, 179, 114, 0.3);
  position: relative;
  overflow: hidden;
}

.chat-input button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: all 0.5s ease;
}

.chat-input button:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 6px 15px rgba(201, 179, 114, 0.4);
}

.chat-input button:hover::before {
  left: 100%;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
  .chat-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 15px;
    border-radius: 14px;
  }

  .chat-header {
    padding: 12px;
  }

  #selected-character {
    width: 70px;
    height: 70px;
  }

  .chat-messages {
    min-height: 350px;
    max-height: 450px;
    padding: 15px;
  }

  .message-content {
    padding: 10px 15px;
    font-size: 15px;
  }

  .chat-input {
    padding: 12px;
  }

  .chat-input input,
  .chat-input textarea {
    padding: 10px 15px;
    font-size: 15px;
  }

  .chat-input textarea {
    min-height: 36px;
    max-height: 100px;
  }

  .chat-input button {
    width: 45px;
    height: 45px;
    font-size: 18px;
  }

  .chat-footer {
    padding: 15px;
  }

  .character-switcher p {
    font-size: 13px;
  }

  .character-thumbnails {
    gap: 10px;
  }

  .character-thumb {
    width: 50px;
    height: 50px;
  }

  .back-button {
    padding: 12px;
    font-size: 13px;
  }

  .character-thumb,
  #selected-character {
    filter: brightness(1.1);
  }
  
  .character-thumb::after,
  #selected-character::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    box-shadow: inset 0 0 10px rgba(201, 179, 114, 0.3);
    border-radius: 50%;
    pointer-events: none;
  }

  body {
    font-size: 15px;
    line-height: 1.4;
  }

  html {
    scroll-behavior: smooth;
  }

  .chat-footer {
    position: relative;
    z-index: 10;
  }
}

/* モバイル表示の最適化 */
@media (max-width: 480px) {
  .chat-container {
    box-sizing: border-box;
    width: 100%;
    padding: 10px;
    margin: 0;
    border-radius: 0;
    display: flex;
    flex-direction: column;
    min-height: calc(var(--vh, 1vh) * 100);
  }

  .chat-header {
    flex-shrink: 0;
    padding: 10px;
    font-size: 16px;
  }

  .chat-messages {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    padding: 10px 5px;
    min-height: 200px;
    height: auto;
    max-height: none; /* 固定高さを解除 */
  }

  .message {
    width: 100%;
    margin: 5px 0;
    display: flex;
    align-items: flex-start;
  }

  .message.bot {
    justify-content: flex-start !important;
    flex-direction: row !important;
  }

  .message.user {
    justify-content: flex-end !important;
    flex-direction: row !important;
  }

  .message-content {
    max-width: 75%;
    padding: 8px 12px;
    word-wrap: break-word;
    word-break: break-word;
    overflow-wrap: break-word;
    hyphens: auto;
    font-size: 14px;
    line-height: 1.4;
  }

  .bot-avatar {
    width: 30px;
    height: 30px;
    margin-right: 8px;
    display: inline-block;
    vertical-align: top;
    border-width: 1px;
  }

  .predefined-messages {
    flex-shrink: 0;
    padding: 5px 0;
    margin-bottom: 5px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .predefined-message-btn {
    font-size: 12px;
    padding: 5px 10px;
    margin: 0 3px;
    white-space: nowrap;
  }

  .chat-input {
    flex-shrink: 0;
    padding: 8px;
    margin-bottom: 10px;
  }

  .chat-input textarea {
    font-size: 14px;
    padding: 8px;
    min-height: 40px;
    max-height: 100px;
  }

  .chat-footer {
    flex-shrink: 0;
    position: sticky;
    bottom: 0;
    padding: 8px 0;
    z-index: 2;
  }

  /* スクロールバーのカスタマイズ */
  .chat-messages::-webkit-scrollbar {
    width: 4px;
  }
  
  .chat-messages::-webkit-scrollbar-thumb {
    border-radius: 2px;
  }
  
  /* キャラクター選択サムネイルの調整 */
  .character-thumb {
    width: 40px;
    height: 40px;
  }
  
  /* ボットアバター画像の読み込みエラー対策 */
  .bot-avatar:not([src]), 
  .bot-avatar[src=""], 
  .bot-avatar[src="undefined"] {
    visibility: hidden;
  }
  
  .bot-avatar[src]:not([src=""]):not([src="undefined"]) {
    visibility: visible;
  }
}

/* モバイル表示時、メッセージ内の画像サイズ調整 */
@media (max-width: 480px) {
  .message-content img {
    max-width: 100%;
    height: auto;
  }

  /* ロード中メッセージの調整 */
  .message.loading {
    margin: 5px 0;
  }

  /* ストリーミング中のテキスト表示の調整 */
  .message.streaming .message-content {
    padding-right: 15px;
  }
}

/* ボットアバターのグローバル調整 */
.bot-avatar {
  object-fit: cover;
  background-color: rgba(20, 20, 30, 0.8);
}

.bot-avatar:not([src]), 
.bot-avatar[src=""], 
.bot-avatar[src="undefined"] {
  content: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="0 0 40 40"><circle cx="20" cy="20" r="20" fill="%231a1a2e"/><circle cx="20" cy="13" r="7" fill="%23c9b372"/><path d="M10,35 C10,25 30,25 30,35" fill="%23c9b372"/></svg>');
}

/* メッセージレイアウトの最適化 - UX向上用の上書きスタイル */
.message.bot {
  display: flex !important;
  flex-direction: row !important;
  align-items: flex-start !important;
  justify-content: flex-start !important;
  width: 100% !important;
}

.message.user {
  display: flex !important;
  flex-direction: row !important;
  align-items: flex-start !important;
  justify-content: flex-end !important;
  width: 100% !important;
}

.message.bot .message-content {
  margin-left: 0 !important;
  background: linear-gradient(135deg, rgba(26, 26, 46, 0.9) 0%, rgba(22, 33, 62, 0.9) 100%) !important;
  border-top-left-radius: 4px !important;
  border: 1px solid rgba(201, 179, 114, 0.1) !important;
  color: #fff !important;
  text-align: left !important;
}

.message.user .message-content {
  margin-right: 0 !important;
  background: linear-gradient(135deg, rgba(201, 179, 114, 0.2) 0%, rgba(201, 179, 114, 0.3) 100%) !important;
  color: #fff !important;
  border-top-right-radius: 4px !important;
  text-align: right !important;
  border: 1px solid rgba(201, 179, 114, 0.2) !important;
}

/* ダークモード対応 */
@media (prefers-color-scheme: dark) {
  .chat-container {
    background-color: #1e1e1e;
    color: #e0e0e0;
  }

  .chat-header {
    background-color: #2c2c2c;
    color: #ffffff;
  }

  .message-content.user {
    background-color: #3a3a3a;
    color: #ffffff;
  }

  .message-content.bot {
    background-color: #2c2c2c;
    color: #e0e0e0;
  }

  .chat-input textarea {
    background-color: #2c2c2c;
    color: #e0e0e0;
    border-color: #3a3a3a;
  }

  .predefined-message-btn {
    background-color: #3a3a3a;
    color: #e0e0e0;
    border-color: #4a4a4a;
  }

  .chat-footer {
    background-color: #1e1e1e;
  }

  .back-button {
    color: #e0e0e0;
  }

  .send-button {
    background-color: #4a4a4a;
    color: #ffffff;
  }

  /* スクロールバーのダークモード調整 */
  .chat-messages::-webkit-scrollbar-track {
    background: #2c2c2c;
  }

  .chat-messages::-webkit-scrollbar-thumb {
    background-color: #4a4a4a;
  }
}

/* アクセシビリティ改善 */
.predefined-message-btn:focus,
.back-button:focus,
.send-button:focus,
.chat-input textarea:focus {
  outline: 2px solid #0078d7;
  outline-offset: 2px;
}

/* モバイル表示時のメッセージ調整 */
@media (max-width: 480px) {
  .message {
    margin-bottom: 15px;
  }
  
  .bot-avatar {
    width: 32px;
    height: 32px;
    margin-right: 6px;
  }
  
  .message.bot .message-content {
    max-width: calc(100% - 45px);
  }
  
  .message.user .message-content {
    max-width: calc(100% - 15px);
  }
  
  .message-content {
    padding: 10px 14px;
    font-size: 14px;
  }
}

/* 「他のキャラクターと会話する」セクション */
.other-characters {
  margin: 20px 0;
  padding: 15px;
  background: rgba(26, 26, 46, 0.5);
  border-radius: 12px;
  border: 1px solid rgba(201, 179, 114, 0.1);
}

.other-characters p {
  margin: 0 0 10px 0;
  color: #fff;
  font-size: 14px;
  text-align: left;
}

.character-thumb-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 5px;
  cursor: pointer;
  transition: transform 0.3s ease;
  padding: 5px;
}

.character-thumb-wrapper:hover {
  transform: translateY(-3px);
}

.character-label {
  margin-top: 5px;
  font-size: 12px;
  color: #fff;
  text-align: center;
  max-width: 70px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.other-character-thumbnails {
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 10px;
}

.other-character-thumb {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  object-fit: cover;
  transition: all 0.3s ease;
  background-color: rgba(20, 20, 30, 0.8);
  border: 2px solid var(--gold-primary);
  padding: 2px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.other-character-thumb:hover {
  box-shadow: 0 4px 12px rgba(201, 179, 114, 0.4);
}

/* モバイル表示の調整 */
@media (max-width: 480px) {
  .other-characters {
    margin: 15px 0;
    padding: 10px;
  }
  
  .other-character-thumb {
    width: 40px;
    height: 40px;
  }
  
  .character-label {
    font-size: 10px;
    max-width: 50px;
  }
  
  .other-character-thumbnails {
    gap: 10px;
  }
  
  .character-thumb-wrapper {
    padding: 3px;
  }
}

/* 定型メッセージ領域 */
.predefined-messages {
  display: flex;
  gap: 10px;
  padding: 15px 0;
  flex-wrap: wrap;
  justify-content: center;
}

.predefined-message-btn {
  background: linear-gradient(135deg, rgba(42, 42, 58, 0.9) 0%, rgba(26, 26, 46, 0.9) 100%);
  color: #fff;
  border: 1px solid var(--gold-primary);
  border-radius: 20px;
  padding: 10px 20px;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2), 0 0 5px rgba(201, 179, 114, 0.1);
  position: relative;
  overflow: hidden;
  outline: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  letter-spacing: 0.3px;
}

.predefined-message-btn::before {
  content: '';
  position: absolute;
  top: -4px;
  left: -4px;
  right: -4px;
  bottom: -4px;
  background: linear-gradient(45deg, var(--gold-primary), transparent, var(--gold-primary));
  z-index: -1;
  border-radius: 23px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.predefined-message-btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.25), 0 0 10px rgba(201, 179, 114, 0.2);
  color: var(--gold-light);
  border-color: var(--gold-light);
}

.predefined-message-btn:hover::before {
  opacity: 0.6;
  animation: rotate 2s linear infinite;
}

.predefined-message-btn:active {
  transform: translateY(1px);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.predefined-message-btn.clicked {
  transform: scale(0.95);
  opacity: 0.8;
  background: linear-gradient(135deg, rgba(26, 26, 46, 0.9) 0%, rgba(42, 42, 58, 0.9) 100%);
  transition: all 0.1s ease;
}

.predefined-message-btn i {
  margin-right: 6px;
  font-size: 12px;
}

@keyframes rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* モバイル表示の定型メッセージ調整 */
@media (max-width: 480px) {
  .predefined-messages {
    padding: 10px 0;
    gap: 8px;
  }
  
  .predefined-message-btn {
    padding: 8px 16px;
    font-size: 13px;
  }
}