/* デフォルト変数（フォールバック） */
:root {
  --bg-color: #F5F5F5;
  --chat-bg: #FFFFFF;
  --user-bubble: #DCF8C6;
  --ai-bubble: #FFFFFF;
  --user-text: #1a1a1a;
  --ai-text: #1a1a1a;
  --header-bg: #4CAF50;
  --header-text: #FFFFFF;
  --input-bg: #FFFFFF;
  --input-border: #E0E0E0;
  --send-button: #4CAF50;
  --font-family: 'Hiragino Sans', 'Noto Sans JP', sans-serif;
  --font-size-base: 16px;
  --bubble-radius: 18px;
  --avatar-size: 40px;
  --disclaimer-bg: #FFF9C4;
  --disclaimer-text: #795548;
}

/* やわらかテーマ（デフォルト） */
.theme-soft {
  --bg-color: #F5F5F5;
  --chat-bg: #FFFFFF;
  --user-bubble: #DCF8C6;
  --ai-bubble: #FFFFFF;
  --user-text: #1a1a1a;
  --ai-text: #1a1a1a;
  --header-bg: #4CAF50;
  --header-text: #FFFFFF;
  --input-bg: #FFFFFF;
  --input-border: #E0E0E0;
  --send-button: #4CAF50;
  --bubble-radius: 18px;
  --disclaimer-bg: #FFF9C4;
  --disclaimer-text: #795548;
}

/* ビジネステーマ */
.theme-business {
  --bg-color: #F0F2F5;
  --chat-bg: #FFFFFF;
  --user-bubble: #0084FF;
  --user-text: #FFFFFF;
  --ai-bubble: #E4E6EB;
  --ai-text: #1a1a1a;
  --header-bg: #1a1a2e;
  --header-text: #FFFFFF;
  --input-bg: #FFFFFF;
  --input-border: #D0D0D0;
  --send-button: #0084FF;
  --bubble-radius: 8px;
  --disclaimer-bg: #E8EAF6;
  --disclaimer-text: #37474F;
}

/* 和風テーマ */
.theme-wafuu {
  --bg-color: #F5F0E8;
  --chat-bg: #FFFEF7;
  --user-bubble: #D4A574;
  --user-text: #FFFFFF;
  --ai-bubble: #F0EDE5;
  --ai-text: #3E2723;
  --header-bg: #5D4037;
  --header-text: #FFFEF7;
  --input-bg: #FFFEF7;
  --input-border: #D7CCC8;
  --send-button: #5D4037;
  --bubble-radius: 4px;
  --disclaimer-bg: #EFEBE9;
  --disclaimer-text: #4E342E;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  background: #e8e8e8;
  height: 100dvh;
  display: flex;
  justify-content: center;
  align-items: center;
}

#chat-container {
  width: 100%;
  max-width: 520px;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg-color);
}

/* 人間対応モードバナー */
#human-mode-banner {
  display: none;
  background: #FF9800;
  color: #fff;
  text-align: center;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  flex-shrink: 0;
}

#human-mode-banner.active {
  display: block;
}

#chat-header {
  background: var(--header-bg);
  color: var(--header-text);
  padding: 14px 16px;
  text-align: center;
  flex-shrink: 0;
}

#chat-header h1 {
  font-size: 18px;
  font-weight: 600;
}

#chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  -webkit-overflow-scrolling: touch;
}

.message-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
}

.message-row.ai {
  flex-direction: row;
}

.message-row.user {
  flex-direction: row-reverse;
}

.avatar {
  width: var(--avatar-size);
  height: var(--avatar-size);
  border-radius: 50%;
  background: var(--header-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
  font-weight: bold;
  flex-shrink: 0;
}

.message-row.user .avatar {
  background: #90CAF9;
}

.bubble {
  max-width: 75%;
  padding: 10px 14px;
  line-height: 1.6;
  word-break: break-word;
  white-space: pre-wrap;
}

.message-row.ai .bubble {
  background: var(--ai-bubble);
  color: var(--ai-text);
  border-radius: var(--bubble-radius) var(--bubble-radius) var(--bubble-radius) 4px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.message-row.user .bubble {
  background: var(--user-bubble);
  color: var(--user-text);
  border-radius: var(--bubble-radius) var(--bubble-radius) 4px var(--bubble-radius);
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

/* スタンプ */
.stamp-container {
  text-align: center;
  padding: 4px 0;
  animation: stampFadeIn 0.4s ease-out;
}

.stamp-container img {
  width: 60px;
  height: 60px;
}

@keyframes stampFadeIn {
  from { opacity: 0; transform: scale(0.8); }
  to { opacity: 1; transform: scale(1); }
}

/* タイピングアニメーション */
.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 12px 16px;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  background: #999;
  border-radius: 50%;
  animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typing {
  0%, 60%, 100% { opacity: 0.3; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-4px); }
}

/* 入力エリア */
#chat-input-area {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 10px 12px;
  background: var(--chat-bg);
  border-top: 1px solid var(--input-border);
  flex-shrink: 0;
}

#input-wrapper {
  flex: 1;
  position: relative;
}

#message-input {
  width: 100%;
  padding: 10px 12px;
  padding-bottom: 24px;
  border: 1px solid var(--input-border);
  border-radius: 20px;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  resize: none;
  outline: none;
  background: var(--input-bg);
  line-height: 1.4;
  max-height: 120px;
  overflow-y: auto;
}

#message-input:focus {
  border-color: var(--header-bg);
}

#char-counter {
  position: absolute;
  bottom: 6px;
  right: 14px;
  font-size: 11px;
  color: #999;
  pointer-events: none;
}

#char-counter.over-limit {
  color: #e53935;
  font-weight: bold;
}

#send-button {
  background: var(--send-button);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 44px;
  height: 44px;
  font-size: 16px;
  cursor: pointer;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.2s;
}

#send-button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

#send-button:hover:not(:disabled) {
  opacity: 0.85;
}

/* 免責表示 */
#disclaimer {
  background: var(--disclaimer-bg);
  color: var(--disclaimer-text);
  font-size: 12px;
  padding: 8px 16px;
  text-align: center;
  line-height: 1.5;
  flex-shrink: 0;
}

/* リンク */
.bubble a {
  color: #1976D2;
  text-decoration: underline;
}

/* レスポンシブ - PC表示 */
@media (min-width: 521px) {
  #chat-container {
    height: 90dvh;
    max-height: 750px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  }
}