:root {
  --primary-color: #1a237e;
  --secondary-color: #283593;
  --accent-color: #3f51b5;
  --bg-dark: #0a0e27;
  --bg-medium: #151932;
  --bg-light: #1e2442;
  --text-primary: #e8eaf6;
  --text-secondary: #9fa8da;
  --border-color: #2a3154;
  --success-color: #4caf50;
  --error-color: #f44336;
  --code-bg: #0d1117;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
}

/* ===== ログイン画面 ===== */
.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--bg-dark) 100%);
}

.login-container {
  background: var(--bg-medium);
  padding: 3rem;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  text-align: center;
  min-width: 350px;
}

.login-container h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  color: var(--accent-color);
}

.login-subtitle {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  font-size: 0.95rem;
}

#loginForm {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

#loginForm input {
  padding: 0.875rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  background: var(--bg-light);
  color: var(--text-primary);
  font-size: 1rem;
  transition: border-color 0.3s;
}

#loginForm input:focus {
  outline: none;
  border-color: var(--accent-color);
}

#loginForm button {
  padding: 0.875rem;
  background: var(--accent-color);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.3s;
}

#loginForm button:hover {
  background: var(--secondary-color);
}

.login-note {
  margin-top: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* ===== メインアプリ ===== */
.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

/* ヘッダー */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background: var(--bg-medium);
  border-bottom: 1px solid var(--border-color);
  height: 60px;
}

.menu-btn {
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  margin-right: 1rem;
  transition: color 0.3s;
}

.menu-btn:hover {
  color: var(--accent-color);
}

.app-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent-color);
  flex: 1;
}

.header-clock {
  font-family: 'Courier New', monospace;
  font-size: 1rem;
  color: var(--text-secondary);
  margin-right: 2rem;
}

.logout-btn {
  padding: 0.5rem 1.25rem;
  background: var(--error-color);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: opacity 0.3s;
}

.logout-btn:hover {
  opacity: 0.8;
}

/* メインコンテナ */
.main-container {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* サイドバー */
.sidebar {
  width: 300px;
  background: var(--bg-medium);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
}

.sidebar.hidden {
  transform: translateX(-100%);
}

.sidebar-actions {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-btn {
  padding: 0.75rem;
  border: none;
  border-radius: 6px;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.3s;
  font-weight: 500;
}

.sidebar-btn.primary {
  background: var(--accent-color);
  color: white;
}

.sidebar-btn.primary:hover {
  background: var(--secondary-color);
}

.sidebar-btn:not(.primary) {
  background: var(--bg-light);
  color: var(--text-primary);
}

.sidebar-btn:not(.primary):hover {
  background: var(--border-color);
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
}

/* フロア */
.floor {
  margin-bottom: 0.5rem;
}

.floor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem;
  background: var(--bg-light);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s;
}

.floor-header:hover {
  background: var(--border-color);
}

.floor-header-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1;
}

.floor-toggle {
  font-size: 0.8rem;
  transition: transform 0.3s;
}

.floor-toggle.expanded {
  transform: rotate(90deg);
}

.floor-name {
  font-weight: 500;
  font-size: 0.95rem;
}

.floor-actions {
  display: flex;
  gap: 0.25rem;
}

.icon-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.25rem;
  font-size: 0.9rem;
  transition: color 0.3s;
}

.icon-btn:hover {
  color: var(--accent-color);
}

.floor-rooms {
  margin-top: 0.25rem;
  margin-left: 1rem;
  display: none;
}

.floor-rooms.expanded {
  display: block;
}

/* ルーム */
.room-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.625rem 0.75rem;
  margin: 0.25rem 0;
  background: var(--bg-dark);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s;
}

.room-item:hover {
  background: var(--border-color);
}

.room-item.active {
  background: var(--accent-color);
  color: white;
}

.room-name {
  flex: 1;
  font-size: 0.9rem;
}

.room-actions {
  display: flex;
  gap: 0.25rem;
  opacity: 0;
  transition: opacity 0.3s;
}

.room-item:hover .room-actions {
  opacity: 1;
}

/* チャットエリア */
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-dark);
  transition: margin-left 0.3s ease;
}

.sidebar.hidden ~ .chat-area {
  margin-left: 0;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--bg-medium);
  border-bottom: 1px solid var(--border-color);
  font-weight: 600;
  font-size: 1.1rem;
}

.chat-actions {
  display: flex;
  gap: 0.5rem;
}

.action-btn {
  background: var(--bg-light);
  border: none;
  color: var(--text-primary);
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.3s;
}

.action-btn:hover {
  background: var(--border-color);
}

/* メッセージコンテナ */
.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
}

.welcome-message {
  text-align: center;
  margin-top: 3rem;
  color: var(--text-secondary);
}

.welcome-message h2 {
  color: var(--accent-color);
  margin-bottom: 0.5rem;
}

/* メッセージ */
.message {
  margin-bottom: 1.5rem;
  animation: fadeIn 0.3s ease;
}

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

.message-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.message-role {
  font-weight: 600;
  font-size: 0.9rem;
}

.message.user .message-role {
  color: var(--accent-color);
}

.message.assistant .message-role {
  color: var(--success-color);
}

.message-time {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.message-content {
  background: var(--bg-medium);
  padding: 1rem;
  border-radius: 8px;
  line-height: 1.2;
  word-wrap: break-word;
}

.message-content br {
  display: block;
  content: "";
  margin: 0;
  line-height: 0.5em;
}

.message-content h1,
.message-content h2,
.message-content h3 {
  margin: 1rem 0 0.5rem 0;
  color: var(--accent-color);
}

.message-content h1 {
  font-size: 1.5rem;
}

.message-content h2 {
  font-size: 1.3rem;
}

.message-content h3 {
  font-size: 1.1rem;
}

.message-content ul,
.message-content ol {
  margin: 0.3rem 0;
  padding-left: 1.5rem;
  line-height: 1.4;
}

.message-content li {
  margin: 0.1rem 0;
  line-height: 1.3;
}

.message-content strong {
  font-weight: 600;
  color: var(--text-primary);
}

.message-content em {
  font-style: italic;
}

.message.user .message-content {
  background: var(--bg-light);
}

/* コードブロック */
.code-block {
  position: relative;
  margin: 1rem 0;
}

.inline-code {
  background: var(--code-bg);
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  font-family: 'Courier New', Consolas, monospace;
  font-size: 0.9em;
  color: #e8eaf6;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-dark);
  padding: 0.5rem 1rem;
  border-radius: 6px 6px 0 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.copy-code-btn {
  background: var(--accent-color);
  color: white;
  border: none;
  padding: 0.25rem 0.75rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.8rem;
  transition: background 0.3s;
}

.copy-code-btn:hover {
  background: var(--secondary-color);
}

.code-content {
  background: var(--code-bg);
  padding: 1rem;
  border-radius: 0 0 6px 6px;
  overflow-x: auto;
  font-family: 'Courier New', Consolas, monospace;
  font-size: 0.9rem;
  line-height: 1.5;
}

/* 入力エリア */
.input-area {
  background: var(--bg-medium);
  border-top: 1px solid var(--border-color);
  padding: 1rem;
}

.drop-zone {
  border: 2px dashed var(--border-color);
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  display: none;
  transition: all 0.3s;
}

.drop-zone.active {
  display: block;
  border-color: var(--accent-color);
  background: var(--bg-light);
}

.drop-zone.dragover {
  border-color: var(--success-color);
  background: rgba(76, 175, 80, 0.1);
}

.uploaded-files {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  max-height: 100px;
  overflow-y: auto;
}

.file-chip {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-light);
  padding: 0.5rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
}

.file-chip-remove {
  background: none;
  border: none;
  color: var(--error-color);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}

.input-container {
  display: flex;
  gap: 0.5rem;
  align-items: flex-end;
}

.attach-btn {
  background: var(--bg-light);
  border: none;
  color: var(--text-primary);
  padding: 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1.25rem;
  transition: background 0.3s;
}

.attach-btn:hover {
  background: var(--border-color);
}

#messageInput {
  flex: 1;
  background: var(--bg-light);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  padding: 0.75rem;
  font-size: 1rem;
  font-family: inherit;
  resize: none;
  max-height: 150px;
  transition: border-color 0.3s;
}

#messageInput:focus {
  outline: none;
  border-color: var(--accent-color);
}

.send-btn {
  background: var(--accent-color);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: background 0.3s;
}

.send-btn:hover {
  background: var(--secondary-color);
}

.send-btn:disabled {
  background: var(--border-color);
  cursor: not-allowed;
}

.stop-btn {
  background: #d32f2f;
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: background 0.3s;
}

.stop-btn:hover {
  background: #b71c1c;
}

/* モーダル */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--bg-medium);
  padding: 2rem;
  border-radius: 12px;
  min-width: 400px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.modal-content h3 {
  margin-bottom: 1rem;
  color: var(--accent-color);
}

.modal-content input,
.modal-content select {
  width: 100%;
  padding: 0.75rem;
  background: var(--bg-light);
  border: 2px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 1rem;
  margin-bottom: 1rem;
}

.modal-content input:focus,
.modal-content select:focus {
  outline: none;
  border-color: var(--accent-color);
}

.modal-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
}

.modal-btn {
  padding: 0.625rem 1.25rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: background 0.3s;
}

.modal-btn.primary {
  background: var(--accent-color);
  color: white;
}

.modal-btn.primary:hover {
  background: var(--secondary-color);
}

.modal-btn:not(.primary) {
  background: var(--bg-light);
  color: var(--text-primary);
}

.modal-btn:not(.primary):hover {
  background: var(--border-color);
}

/* ローディング */
.loading {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid var(--border-color);
  border-top-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* スクロールバー */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent-color);
}

/* レスポンシブ */
@media (max-width: 768px) {
  body {
    overflow: hidden;
  }

  .app-container {
    height: 100vh;
    height: 100dvh; /* 動的ビューポート高さ */
    overflow: hidden;
  }

  .main-container {
    height: calc(100vh - 60px);
    height: calc(100dvh - 60px);
  }

  .sidebar {
    position: fixed;
    top: 60px;
    left: 0;
    bottom: 0;
    z-index: 100;
    width: 100%;
    max-width: 300px;
    transform: translateX(-100%);
  }

  .sidebar:not(.hidden) {
    transform: translateX(0);
  }

  .chat-area {
    width: 100%;
    height: 100%;
  }

  .messages-container {
    padding: 1rem;
    padding-bottom: 0.5rem;
  }

  .input-area {
    padding: 0.75rem;
    position: sticky;
    bottom: 0;
    background: var(--bg-medium);
  }

  #messageInput {
    max-height: 100px;
    font-size: 16px; /* iOS のズーム防止 */
  }

  .header-clock {
    display: none;
  }

  .app-title {
    font-size: 1.25rem;
  }

  .login-container {
    min-width: auto;
    width: 90%;
    padding: 2rem;
  }

  .modal-content {
    min-width: auto;
    width: 90%;
  }
}