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

:root {
  --bg-primary: #f0ebe3;
  --bg-secondary: #e8e0d4;
  --bg-message-user: #d4c8b8;
  --bg-message-ai: #e8e0d4;
  --bg-sidebar: #e2dbd0;
  --text-primary: #3a3632;
  --text-secondary: #6b6560;
  --text-muted: #9a938c;
  --accent: #b8a99a;
  --accent-hover: #a89888;
  --border: #d4ccc0;
  --thinking-bg: #ddd5c8;
  --thinking-border: #c8bfb2;
  --input-bg: #f5f0ea;
  --shadow: rgba(58, 54, 50, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #1e1d1b;
    --bg-secondary: #28261f;
    --bg-message-user: #3a362a;
    --bg-message-ai: #2e2c24;
    --bg-sidebar: #242220;
    --text-primary: #e0dbd4;
    --text-secondary: #a09888;
    --text-muted: #706860;
    --accent: #8a7e6e;
    --accent-hover: #9a8e7e;
    --border: #3a3630;
    --thinking-bg: #2a2822;
    --thinking-border: #3a3630;
    --input-bg: #2a2822;
    --shadow: rgba(0, 0, 0, 0.2);
  }
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
}

.app {
  display: flex;
  height: 100%;
}

.sidebar {
  width: 260px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid var(--border);
}

.sidebar-header h1 {
  font-size: 1.3rem;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: 0.05em;
}

.sidebar-section {
  padding: 12px;
}

.new-chat-btn {
  width: 100%;
  padding: 10px;
  background: var(--accent);
  color: var(--bg-primary);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.2s;
}

.new-chat-btn:hover {
  background: var(--accent-hover);
}

.chat-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.chat-item {
  padding: 10px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background 0.2s;
}

.chat-item:hover {
  background: var(--bg-secondary);
}

.chat-item.active {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.sidebar-footer {
  padding: 12px;
  border-top: 1px solid var(--border);
}

.settings-btn {
  width: 100%;
  padding: 10px;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
}

.settings-btn:hover {
  background: var(--bg-secondary);
}

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.chat-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
}

.toggle-sidebar {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  display: none;
}

.chat-title {
  font-size: 1rem;
  font-weight: 500;
  flex: 1;
}

.token-info {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.welcome {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  font-size: 1rem;
}

.message {
  max-width: 75%;
  padding: 12px 16px;
  border-radius: 4px;
  font-size: 0.95rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.message.user {
  align-self: flex-end;
  background: var(--bg-message-user);
  color: var(--text-primary);
}

.message.assistant {
  align-self: flex-start;
  background: var(--bg-message-ai);
  color: var(--text-primary);
}

.thinking-block {
  margin-bottom: 8px;
}

.thinking-toggle {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.8rem;
  cursor: pointer;
  padding: 4px 0;
  display: flex;
  align-items: center;
  gap: 4px;
}

.thinking-toggle:hover {
  color: var(--text-secondary);
}

.thinking-content {
  display: none;
  padding: 10px 12px;
  margin-top: 6px;
  background: var(--thinking-bg);
  border-left: 2px solid var(--thinking-border);
  border-radius: 2px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  white-space: pre-wrap;
}

.thinking-content.open {
  display: block;
}

.thinking-arrow {
  display: inline-block;
  transition: transform 0.2s;
  font-size: 0.7rem;
}

.thinking-arrow.open {
  transform: rotate(90deg);
}

.input-area {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.input-row {
  display: flex;
  gap: 10px;
  align-items: flex-end;
}

.image-btn {
  width: 42px;
  height: 42px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-secondary);
  font-size: 1.4rem;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.2s;
  line-height: 1;
}

.image-btn:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.image-preview {
  display: none;
  flex-wrap: wrap;
  gap: 8px;
  padding: 8px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.image-preview.has-images {
  display: flex;
}

.image-preview-item {
  position: relative;
  width: 80px;
  height: 80px;
  border-radius: 4px;
  overflow: hidden;
}

.image-preview-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-preview-remove {
  position: absolute;
  top: 2px;
  right: 2px;
  width: 20px;
  height: 20px;
  background: rgba(0,0,0,0.5);
  color: white;
  border: none;
  border-radius: 50%;
  font-size: 0.7rem;
  cursor: pointer;
  line-height: 1;
}

.message-image {
  max-width: 100%;
  max-height: 300px;
  border-radius: 4px;
  margin-bottom: 8px;
  cursor: pointer;
}

.message-image:hover {
  opacity: 0.9;
}

#messageInput {
  flex: 1;
  padding: 12px 14px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: inherit;
  resize: none;
  max-height: 150px;
  line-height: 1.5;
  outline: none;
  transition: border-color 0.2s;
}

#messageInput:focus {
  border-color: var(--accent);
}

#messageInput::placeholder {
  color: var(--text-muted);
}

.send-btn {
  padding: 12px 20px;
  background: var(--accent);
  color: var(--bg-primary);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.2s;
  white-space: nowrap;
}

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

.send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.4);
  z-index: 100;
  align-items: center;
  justify-content: center;
}

.modal.open {
  display: flex;
}

.modal-content {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  width: 90%;
  max-width: 560px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h2 {
  font-size: 1rem;
  font-weight: 500;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.4rem;
  cursor: pointer;
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
}

.modal-body label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.modal-body textarea {
  width: 100%;
  padding: 12px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: inherit;
  resize: vertical;
  outline: none;
  line-height: 1.5;
}

.modal-body textarea:focus {
  border-color: var(--accent);
}

.modal-actions {
  margin-top: 16px;
  display: flex;
  justify-content: flex-end;
}

.save-btn {
  padding: 10px 24px;
  background: var(--accent);
  color: var(--bg-primary);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.2s;
}

.save-btn:hover {
  background: var(--accent-hover);
}

/* === 导航与房间 === */
.app-container {
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.bottom-nav {
  display: flex;
  border-top: 1px solid var(--border);
  background: var(--bg-sidebar);
  padding: 6px 0;
  flex-shrink: 0;
  order: 2;
}

.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 6px 0;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: color 0.2s;
  font-size: 0.75rem;
}

.nav-item.active {
  color: var(--text-primary);
}

.nav-icon {
  font-size: 1.3rem;
}

.nav-label {
  font-size: 0.7rem;
}

.room {
  display: none;
  flex: 1;
  overflow: hidden;
  order: 1;
}

.room.active {
  display: flex;
  flex-direction: column;
}

.room-chat.active {
  display: flex;
}

.room-chat .app {
  flex: 1;
}

/* === 书房 === */
.study-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.study-header h1 {
  font-size: 1.1rem;
  font-weight: 500;
}

.study-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.study-tab {
  flex: 1;
  padding: 10px 0;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.study-tab.active {
  color: var(--text-primary);
  border-bottom-color: var(--accent);
}

.study-panel {
  display: none;
  flex: 1;
  flex-direction: column;
  overflow: hidden;
}

.study-panel.active {
  display: flex;
}

.panel-actions {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.panel-btn {
  padding: 8px 16px;
  background: var(--accent);
  color: var(--bg-primary);
  border: none;
  border-radius: 4px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.2s;
  white-space: nowrap;
}

.panel-btn:hover {
  background: var(--accent-hover);
}

.panel-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.memory-search {
  display: flex;
  gap: 8px;
  flex: 1;
}

.memory-search input {
  flex: 1;
  padding: 8px 12px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 0.85rem;
  outline: none;
}

.memory-search input:focus {
  border-color: var(--accent);
}

.panel-list {
  flex: 1;
  overflow-y: auto;
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.panel-empty {
  color: var(--text-muted);
  text-align: center;
  padding: 40px 0;
  font-size: 0.9rem;
}

.panel-card {
  padding: 14px 16px;
  background: var(--bg-message-ai);
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s;
}

.panel-card:hover {
  background: var(--bg-secondary);
}

.panel-card-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.panel-card-preview {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
}

.panel-card-title {
  font-size: 0.9rem;
  color: var(--text-primary);
  margin-bottom: 4px;
  font-weight: 500;
}

.content-view {
  font-size: 0.9rem;
  line-height: 1.8;
  white-space: pre-wrap;
  color: var(--text-primary);
}

.loading-text {
  color: var(--text-muted);
  text-align: center;
  padding: 20px;
  font-size: 0.85rem;
}

/* === 记忆库分类筛选 === */
.memory-filters {
  display: flex;
  gap: 6px;
  padding: 8px 16px;
  overflow-x: auto;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.memory-filter {
  padding: 4px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 16px;
  color: var(--text-secondary);
  font-size: 0.75rem;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

.memory-filter.active {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
}

/* === 记忆库卡片 === */
.memory-section {
  margin-bottom: 16px;
}

.memory-section-header {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 8px 0 6px;
  font-weight: 500;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}

.memory-card {
  background: var(--bg-message-ai);
  border-radius: 6px;
  padding: 10px 14px;
  margin-bottom: 6px;
}

.memory-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.memory-icon {
  font-size: 0.9rem;
  flex-shrink: 0;
}

.memory-name {
  font-size: 0.85rem;
  color: var(--text-primary);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.memory-importance {
  font-size: 0.75rem;
  color: var(--accent);
  flex-shrink: 0;
}

.memory-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 6px;
  align-items: center;
}

.memory-domain {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-right: 4px;
}

.memory-tag {
  font-size: 0.65rem;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: 1px 6px;
  border-radius: 3px;
}

.memory-card-content {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
  white-space: pre-wrap;
}

/* === 右键菜单 === */
.context-menu {
  position: fixed;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 0;
  z-index: 200;
  box-shadow: 0 4px 12px var(--shadow);
  min-width: 100px;
}

.context-menu-item {
  padding: 8px 16px;
  font-size: 0.85rem;
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.15s;
}

.context-menu-item:hover {
  background: var(--bg-secondary);
}

.context-menu-item.danger {
  color: #c45;
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100%;
    z-index: 50;
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .toggle-sidebar {
    display: block;
  }

  .message {
    max-width: 90%;
  }
}