/* --- 全局变量与重置 --- */
:root {
  --bg-main: #ffffff;
  --bg-sidebar: #f8f9fa;
  --bg-msg-user: #f4f4f7;
  --bg-msg-bot: #ffffff;
  --text-main: #202123;
  --text-muted: #6e6e80;
  --border: #e5e5e5;
  --accent: #10a37f;
  --accent-dark: #0e8c6d;
  --accent-light: rgba(16, 163, 127, 0.1);
  --danger: #e74c3c;
  --danger-dark: #c0392b;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --radius: 8px;
  --radius-lg: 16px;
  --font-mono: 'SF Mono', 'Fira Code', monospace;
}

.dark-mode {
  --bg-main: #212121;
  --bg-sidebar: #171717;
  --bg-msg-user: #2f2f2f;
  --bg-msg-bot: #212121;
  --text-main: #ececf1;
  --text-muted: #9a9a9a;
  --border: #3d3d3d;
  --accent-light: rgba(16, 163, 127, 0.15);
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.4);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  outline: none;
}

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

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --- 布局结构 --- */
#main-container {
  display: flex;
  height: 100%;
  width: 100%;
}

/* --- 侧边栏 --- */
#sidebar {
  width: 260px;
  min-width: 260px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: margin 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

#sidebar.collapsed {
  margin-left: -260px;
}

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

.brand-text {
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 1px;
  color: var(--accent);
}

/* --- 搜索 --- */
#search-wrapper {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

#search-wrapper svg {
  flex-shrink: 0;
  color: var(--text-muted);
}

#search-input {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-main);
  font-size: 12px;
  padding: 4px 0;
  outline: none;
  min-width: 0;
}

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

#search-clear-btn {
  font-size: 12px;
  width: 20px;
  height: 20px;
}

/* --- 历史分组 --- */
.history-group-header {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 12px 12px 4px;
}

.history-group-header:first-child {
  padding-top: 4px;
}

#history-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px;
}

.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  margin-bottom: 2px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  transition: 0.15s;
}

.history-item:hover {
  background: rgba(0, 0, 0, 0.05);
}

.dark-mode .history-item:hover {
  background: rgba(255, 255, 255, 0.05);
}

.history-item.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 500;
}

.history-item .history-title {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-item button {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 16px;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  opacity: 0;
  transition: 0.15s;
}

.history-item:hover button {
  opacity: 1;
}

.history-item button:hover {
  background: rgba(0,0,0,0.1);
  color: var(--danger);
}

#sidebar-footer {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-top: 1px solid var(--border);
}

.footer-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  transition: 0.15s;
}

.footer-btn:hover {
  color: var(--text-main);
  border-color: var(--text-muted);
}

/* --- 主内容区 --- */
#chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-main);
  min-width: 0;
}

#chat-header {
  height: 56px;
  padding: 0 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
  position: relative;
}

/* Context progress bar below header */
.context-bar {
  height: 3px;
  background: var(--border);
  position: relative;
  flex-shrink: 0;
  cursor: pointer;
}

.context-bar-fill {
  height: 100%;
  background: var(--accent);
  transition: width 0.3s;
  border-radius: 0 2px 2px 0;
}

.context-bar-fill.warn {
  background: #f0ad4e;
}

.context-bar-fill.danger {
  background: var(--danger);
}

.context-bar-text {
  position: absolute;
  right: 8px;
  top: 6px;
  font-size: 10px;
  color: var(--text-muted);
  white-space: nowrap;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

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

#chat-title {
  font-size: 15px;
  font-weight: 600;
  max-width: 240px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* --- Badge --- */
.badge {
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 12px;
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 500;
  white-space: nowrap;
}

.profile-badge {
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 12px;
  background: rgba(0,0,0,0.04);
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
}

.dark-mode .profile-badge {
  background: rgba(255,255,255,0.05);
}

/* --- 对话历史 --- */
#chat-history {
  flex: 1;
  overflow-y: auto;
  padding-bottom: 20px;
}

.user-msg, .bot-msg {
  padding: 24px 10%;
  border-bottom: 1px solid var(--border);
  position: relative;
  line-height: 1.7;
  font-size: 15px;
}

.user-msg {
  background: var(--bg-msg-user);
}

.bot-msg {
  background: var(--bg-msg-bot);
}

.user-msg p { margin: 0; }

/* Markdown 内容 */
.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4 {
  margin: 16px 0 8px;
  line-height: 1.3;
}

.markdown-content h1 { font-size: 1.4em; border-bottom: 1px solid var(--border); padding-bottom: 4px; }
.markdown-content h2 { font-size: 1.25em; }
.markdown-content h3 { font-size: 1.1em; }

.markdown-content p { margin: 8px 0; }
.markdown-content ul, .markdown-content ol { padding-left: 24px; margin: 8px 0; }
.markdown-content li { margin: 4px 0; }

.markdown-content code {
  background: rgba(0,0,0,0.06);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.dark-mode .markdown-content code {
  background: rgba(255,255,255,0.08);
}

.markdown-content pre {
  background: rgba(0,0,0,0.04);
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 12px 0;
  border: 1px solid var(--border);
}

.dark-mode .markdown-content pre {
  background: rgba(255,255,255,0.03);
}

.markdown-content pre code {
  background: none;
  padding: 0;
  font-size: 13px;
  line-height: 1.5;
}

.markdown-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 4px 16px;
  margin: 12px 0;
  color: var(--text-muted);
  background: rgba(0,0,0,0.02);
}

.dark-mode .markdown-content blockquote {
  background: rgba(255,255,255,0.02);
}

.markdown-content table {
  border-collapse: collapse;
  margin: 12px 0;
  width: 100%;
  font-size: 14px;
}

.markdown-content th, .markdown-content td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}

.markdown-content th {
  background: var(--bg-sidebar);
  font-weight: 600;
}

/* 思维链盒子 */
.reasoning-box {
  background: rgba(0, 0, 0, 0.02);
  border-left: 3px solid var(--accent);
  padding: 12px 16px;
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
  white-space: pre-wrap;
  border-radius: 0 6px 6px 0;
  max-height: 300px;
  overflow-y: auto;
  cursor: pointer;
  position: relative;
}

.dark-mode .reasoning-box {
  background: rgba(255, 255, 255, 0.02);
}

.reasoning-box.collapsed {
  max-height: 60px;
  overflow: hidden;
}

.reasoning-box::after {
  content: "思维链";
  position: absolute;
  top: 8px;
  right: 10px;
  font-size: 10px;
  font-style: normal;
  font-weight: 600;
  color: var(--accent);
  opacity: 0.6;
}

/* --- 复制按钮 --- */
.copy-btn {
  position: absolute;
  bottom: 8px;
  right: 12px;
  padding: 4px 10px;
  font-size: 10px;
  font-weight: 600;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transition: 0.15s;
}

.bot-msg:hover .copy-btn,
.user-msg:hover .copy-btn {
  opacity: 1;
}

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

/* --- 输入区域 --- */
#input-area {
  padding: 16px 10% 24px;
  flex-shrink: 0;
}

#input-wrapper {
  display: flex;
  align-items: flex-end;
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px;
  box-shadow: var(--shadow);
  transition: border-color 0.15s;
}

#input-wrapper:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-light);
}

#user-input {
  flex: 1;
  border: none;
  background: transparent;
  padding: 8px 12px;
  color: var(--text-main);
  font-size: 15px;
  resize: none;
  max-height: 200px;
  font-family: inherit;
  line-height: 1.5;
}

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

.drop-area {
  display: none;
  padding: 8px 12px;
  text-align: center;
  border: 1px dashed var(--accent);
  border-radius: 8px;
  margin-bottom: 10px;
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-light);
}

.drop-area.active {
  display: block;
}

/* --- 按钮通用 --- */
.icon-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  transition: 0.15s;
  flex-shrink: 0;
}

.icon-btn:hover {
  background: rgba(0, 0, 0, 0.05);
  color: var(--text-main);
}

.primary-btn {
  background: var(--accent);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  transition: 0.15s;
}

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

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

.secondary-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  transition: 0.15s;
}

.secondary-btn:hover {
  border-color: var(--text-muted);
  background: rgba(0,0,0,0.02);
}

.danger-btn {
  background: transparent;
  border: 1px solid var(--danger);
  color: var(--danger);
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  transition: 0.15s;
}

.danger-btn:hover {
  background: var(--danger);
  color: white;
}

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

.send-btn:disabled {
  opacity: 0.3;
}

/* ===== 弹窗通用 ===== */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal.show {
  display: flex;
}

.modal-content {
  background: var(--bg-main);
  border-radius: var(--radius-lg);
  width: 420px;
  max-width: 90vw;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
}

.modal-lg {
  width: 640px;
  max-width: 92vw;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px 12px;
  flex-shrink: 0;
}

.modal-header h3 {
  font-size: 16px;
  font-weight: 700;
}

.modal-close {
  font-size: 18px;
  width: 32px;
  height: 32px;
}

/* --- Tabs --- */
.tabs-nav {
  display: flex;
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  flex-shrink: 0;
}

.tab-btn {
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 500;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: 0.15s;
  margin-bottom: -1px;
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-content {
  display: none;
  padding: 20px 24px;
  overflow-y: auto;
  flex: 1;
}

.tab-content.active {
  display: block;
}

/* --- Input Groups --- */
.input-group {
  margin-bottom: 16px;
}

.input-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.input-group input,
.input-group textarea,
.input-group select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-sidebar);
  color: var(--text-main);
  font-size: 13px;
  font-family: inherit;
  transition: border-color 0.15s;
}

.input-group input:focus,
.input-group textarea:focus,
.input-group select:focus {
  border-color: var(--accent);
}

.input-group select {
  cursor: pointer;
  appearance: auto;
}

.input-group textarea {
  resize: vertical;
  min-height: 60px;
  line-height: 1.5;
}

.input-with-btn {
  display: flex;
  gap: 6px;
}

.input-with-btn input {
  flex: 1;
}

.input-with-btn .icon-btn {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px;
  font-size: 14px;
}

/* --- Param Groups (Sliders) --- */
.param-group {
  margin-bottom: 20px;
}

.param-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 4px;
}

.param-header label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
}

.param-value {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  font-family: var(--font-mono);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--border);
  outline: none;
  margin: 8px 0;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
  transition: 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 2px solid white;
  box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

.param-labels {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--text-muted);
  padding: 0 2px;
}

/* --- Toggle Switch --- */
label.toggle-label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
}

.toggle-label input[type="checkbox"] {
  display: none;
}

.toggle-track {
  width: 40px;
  height: 22px;
  background: #b0b0b0;
  border-radius: 11px;
  position: relative;
  transition: 0.2s;
  flex-shrink: 0;
}

.toggle-label input:checked + .toggle-track {
  background: var(--accent);
}

.toggle-knob {
  width: 18px;
  height: 18px;
  background: white;
  border-radius: 50%;
  position: absolute;
  top: 2px;
  left: 2px;
  transition: 0.2s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.toggle-label input:checked + .toggle-track .toggle-knob {
  left: 20px;
}

.toggle-text {
  font-size: 13px;
  color: var(--text-muted);
}

/* --- Section Divider --- */
.section-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 20px 0 12px;
}

.section-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 14px;
}

.help-text {
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-top: -8px;
}

.help-text code {
  background: rgba(0,0,0,0.05);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 10px;
}

.dark-mode .help-text code {
  background: rgba(255,255,255,0.08);
}

/* --- Buttons Row --- */
.btn-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 8px;
}

.status-text {
  font-size: 12px;
  color: var(--text-muted);
}

.status-text.success { color: var(--accent); }
.status-text.error { color: var(--danger); }

/* --- Profiles --- */
.profiles-toolbar {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.profiles-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.empty-hint {
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
  padding: 24px;
}

.profile-card {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: 0.15s;
}

.profile-card:hover {
  border-color: var(--accent);
}

.profile-card.active {
  border-color: var(--accent);
  background: var(--accent-light);
}

.profile-card-info {
  flex: 1;
  min-width: 0;
}

.profile-card-name {
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 2px;
}

.profile-card-meta {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.profile-card-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.profile-card-actions button {
  padding: 4px 10px;
  font-size: 11px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: 0.1s;
}

.profile-card-actions .load-profile-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.profile-card-actions .delete-profile-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
}

/* --- About Tab --- */
.about-section h4 {
  margin-bottom: 8px;
  font-size: 16px;
}

.about-section p {
  margin: 6px 0;
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}

.about-section hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 16px 0;
}

/* --- Modal Actions --- */
.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 12px 24px 20px;
  flex-shrink: 0;
}

/* ===== 人格管理弹窗 ===== */
.persona-layout {
  display: flex;
  height: 400px;
  border-top: 1px solid var(--border);
}

.persona-sidebar {
  width: 200px;
  min-width: 200px;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.persona-sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
}

.persona-sidebar-header .icon-btn {
  font-size: 18px;
  font-weight: 700;
}

#persona-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.persona-list-item {
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  transition: 0.1s;
  margin-bottom: 2px;
}

.persona-list-item:hover {
  background: rgba(0,0,0,0.04);
}

.dark-mode .persona-list-item:hover {
  background: rgba(255,255,255,0.04);
}

.persona-list-item.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 500;
}

.persona-upload-area {
  padding: 10px;
  border-top: 1px solid var(--border);
}

.upload-label {
  display: block;
  cursor: pointer;
}

.upload-btn {
  display: block;
  text-align: center;
  width: 100%;
}

.persona-editor {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.persona-editor .input-group:first-child {
  margin-bottom: 12px;
}

.persona-editor .input-group textarea {
  min-height: 140px;
  font-size: 13px;
  line-height: 1.6;
}

.persona-editor-actions {
  display: flex;
  gap: 6px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.persona-editor-actions .primary-btn {
  padding: 8px 16px;
  font-size: 12px;
}

.persona-editor-actions .secondary-btn,
.persona-editor-actions .danger-btn {
  padding: 8px 12px;
  font-size: 11px;
}

/* --- Saving indicator --- */
.saving-indicator {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 6px;
  animation: pulse 1s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* --- Empty chat state --- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  text-align: center;
  padding: 40px;
}

.empty-state h2 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
}

.empty-state p {
  font-size: 14px;
  line-height: 1.6;
  max-width: 360px;
}

.empty-state .shortcuts {
  margin-top: 20px;
  font-size: 12px;
  color: var(--text-muted);
  text-align: left;
}

.empty-state .shortcuts kbd {
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 11px;
  font-family: var(--font-mono);
}

/* --- Loading spinner --- */
.loading-dots::after {
  content: '';
  animation: dots 1.5s infinite;
}

@keyframes dots {
  0% { content: ''; }
  33% { content: '.'; }
  66% { content: '..'; }
  100% { content: '...'; }
}

/* --- Responsive --- */
@media (max-width: 768px) {
  #sidebar {
    position: fixed;
    z-index: 100;
    height: 100%;
    box-shadow: 2px 0 20px rgba(0,0,0,0.15);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

  #sidebar.collapsed {
    transform: translateX(-260px);
    box-shadow: none;
  }

  .user-msg, .bot-msg {
    padding-left: 16px;
    padding-right: 16px;
  }

  #input-area {
    padding-left: 16px;
    padding-right: 16px;
    padding-bottom: calc(24px + env(safe-area-inset-bottom, 0px));
  }

  .modal-content, .modal-lg {
    width: 96vw;
    max-width: 96vw;
    max-height: 90vh;
  }

  .persona-layout {
    flex-direction: column;
    height: auto;
  }

  .persona-sidebar {
    width: 100%;
    min-width: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 160px;
  }
}

/* ===== Enhanced Code Blocks ===== */

.code-block-enhanced {
  position: relative;
  background: #1e1e1e !important;
  border-radius: 8px !important;
  overflow: hidden;
  margin: 16px 0 !important;
  border: 1px solid #3a3a3a !important;
  padding: 0 !important;
}

.code-block-enhanced code {
  display: block;
  padding: 16px !important;
  overflow-x: auto;
  font-size: 13px !important;
  line-height: 1.6 !important;
  background: transparent !important;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #252525;
  padding: 8px 16px;
  border-bottom: 1px solid #3a3a3a;
  font-size: 12px;
  user-select: none;
}

.code-lang-label {
  display: flex;
  align-items: center;
  gap: 6px;
  color: #ccc;
  font-weight: 500;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.code-lang-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

.code-copy-btn {
  background: #3a3a3a;
  color: #ccc;
  border: none;
  border-radius: 4px;
  padding: 4px 12px;
  font-size: 11px;
  cursor: pointer;
  transition: 0.15s;
}

.code-copy-btn:hover {
  background: #4a4a4a;
  color: #fff;
}

.code-copy-btn.copied {
  background: #2d7d46;
  color: #fff;
}

/* ===== Message Button Group (Copy + Download) ===== */

.msg-btn-group {
  position: absolute;
  bottom: 8px;
  right: 12px;
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.15s;
  z-index: 10;
}

.bot-msg:hover .msg-btn-group,
.user-msg:hover .msg-btn-group {
  opacity: 1;
}

.btn-group {
  display: flex;
  align-items: stretch;
  position: relative;
}

.msg-btn {
  padding: 4px 10px;
  font-size: 10px;
  font-weight: 600;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-right: none;
  border-radius: 4px 0 0 4px;
  color: var(--text-muted);
  cursor: pointer;
  transition: 0.1s;
  line-height: 1.6;
}

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

.msg-btn-dropdown {
  padding: 4px 6px;
  font-size: 8px;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 0 4px 4px 0;
  color: var(--text-muted);
  cursor: pointer;
  transition: 0.1s;
  line-height: 1;
}

.msg-btn-dropdown:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.dropdown-menu {
  display: none;
  position: absolute;
  bottom: 100%;
  right: 0;
  margin-bottom: 4px;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  min-width: 150px;
  z-index: 20;
}

.dropdown-menu.show {
  display: block;
}

.dropdown-menu button {
  display: block;
  width: 100%;
  padding: 8px 14px;
  font-size: 11px;
  text-align: left;
  background: none;
  border: none;
  color: var(--text-main);
  cursor: pointer;
  transition: 0.1s;
  white-space: nowrap;
}

.dropdown-menu button:hover {
  background: var(--accent-light);
  color: var(--accent);
}

/* ===== Rename Input ===== */

.rename-input {
  font-size: 15px;
  font-weight: 600;
  padding: 4px 8px;
  border: 1px solid var(--accent);
  border-radius: 4px;
  background: var(--bg-sidebar);
  color: var(--text-main);
  width: 200px;
  outline: none;
  font-family: inherit;
}

/* ===== Mermaid Diagrams ===== */

.mermaid-container {
  background: white;
  border-radius: 8px;
  padding: 16px;
  margin: 16px 0;
  overflow-x: auto;
  text-align: center;
}

.dark-mode .mermaid-container {
  background: #2d2d2d;
  filter: invert(0.1) hue-rotate(180deg);
}

.mermaid-fallback {
  background: #1e1e1e !important;
  border-radius: 8px;
  padding: 16px !important;
  margin: 0;
  text-align: left;
}

/* ===== KaTeX Dark Mode ===== */

.dark-mode .katex .mathnormal {
  color: #ececf1;
}

/* ===== Highlight.js Overrides for Dark Mode ===== */

.dark-mode .hljs {
  background: transparent !important;
}

/* ===== Inline Code ===== */

.markdown-content code:not([class*="language-"]) {
  background: rgba(0,0,0,0.06);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.9em;
  color: var(--text-main);
}

.dark-mode .markdown-content code:not([class*="language-"]) {
  background: rgba(255,255,255,0.08);
}

/* ===== Message Controls (Edit / Regenerate / Version Nav) ===== */

.msg-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  opacity: 0;
  transition: opacity 0.15s;
}

.user-msg:hover .msg-actions,
.bot-msg:hover .msg-actions {
  opacity: 1;
}

.msg-action-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 11px;
  cursor: pointer;
  transition: 0.1s;
  line-height: 1.5;
}

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

.version-nav {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  font-size: 11px;
  color: var(--text-muted);
  background: var(--bg-sidebar);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px;
}

.nav-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  padding: 1px 5px;
  border-radius: 3px;
  transition: 0.1s;
}

.nav-btn:hover {
  background: var(--accent-light);
  color: var(--accent);
}

.version-idx {
  padding: 0 4px;
  min-width: 24px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

/* Edit Textarea */

.edit-textarea {
  width: 100%;
  min-height: 80px;
  padding: 10px 12px;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: var(--bg-sidebar);
  color: var(--text-main);
  font-size: 14px;
  font-family: inherit;
  line-height: 1.6;
  resize: vertical;
  margin-bottom: 8px;
}

.edit-textarea:focus {
  outline: 2px solid var(--accent-light);
}

.edit-actions {
  display: flex;
  gap: 8px;
}

/* ===== Mermaid responsive ===== */
@media (max-width: 768px) {
  .mermaid-container {
    padding: 8px;
    margin: 12px 0;
  }

  .msg-actions {
    opacity: 1;
  }

  .edit-textarea {
    min-height: 60px;
    font-size: 16px;
  }
}

/* ===== Sidebar mobile close button ===== */
.sidebar-header-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.sidebar-close-btn {
  display: none;
}

@media (max-width: 768px) {
  .sidebar-close-btn {
    display: flex;
  }
}

/* ===== Category bar ===== */
#category-bar {
  display: flex;
  align-items: center;
  padding: 6px 8px;
  gap: 4px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  overflow-x: auto;
}

#category-bar::-webkit-scrollbar {
  height: 2px;
}

#category-list {
  display: flex;
  gap: 4px;
  flex: 1;
  overflow-x: auto;
}

.category-chip {
  white-space: nowrap;
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: 0.15s;
  flex-shrink: 0;
}

.category-chip:hover {
  border-color: var(--accent);
  color: var(--text-main);
}

.category-chip.active {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

#manage-categories-btn {
  font-size: 14px;
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

/* Category drag & drop */
.history-item.dragging {
  opacity: 0.5;
  background: var(--accent-light);
}

.history-item.drag-over {
  border-left: 3px solid var(--accent);
  background: rgba(16, 163, 127, 0.08);
}

.category-drop-area {
  padding: 8px 12px;
  margin: 4px 8px;
  border: 2px dashed var(--border);
  border-radius: 8px;
  text-align: center;
  font-size: 11px;
  color: var(--text-muted);
  display: none;
}

.category-drop-area.show {
  display: block;
}

.category-drop-area.drag-over {
  border-color: var(--accent);
  background: var(--accent-light);
  color: var(--accent);
}

/* ===== Categories management ===== */
.categories-manage-list {
  padding: 16px 24px;
  max-height: 300px;
  overflow-y: auto;
}

.category-manage-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.category-manage-item:last-child {
  border-bottom: none;
}

.category-manage-item .cat-color {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.category-manage-item .cat-name {
  flex: 1;
  font-size: 13px;
}

.category-manage-item .cat-count {
  font-size: 11px;
  color: var(--text-muted);
}

.category-manage-item .icon-btn {
  font-size: 12px;
  width: 24px;
  height: 24px;
}

/* ===== Command autocomplete ===== */
.cmd-autocomplete {
  position: absolute;
  bottom: 100%;
  left: 0;
  right: 0;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 8px 8px 0 0;
  box-shadow: 0 -4px 20px rgba(0,0,0,0.12);
  max-height: 240px;
  overflow-y: auto;
  z-index: 50;
}

.cmd-autocomplete-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  cursor: pointer;
  font-size: 13px;
  transition: 0.1s;
}

.cmd-autocomplete-item:hover,
.cmd-autocomplete-item.selected {
  background: var(--accent-light);
  color: var(--accent);
}

.cmd-autocomplete-item .cmd-name {
  font-weight: 600;
  font-family: var(--font-mono);
  font-size: 12px;
  min-width: 80px;
}

.cmd-autocomplete-item .cmd-desc {
  color: var(--text-muted);
  font-size: 11px;
}

#input-wrapper {
  position: relative;
}

/* ===== Stop button ===== */
.stop-btn {
  color: var(--danger) !important;
  animation: pulse-stop 1.5s infinite;
}

.stop-btn:hover {
  background: rgba(231, 76, 60, 0.1) !important;
}

@keyframes pulse-stop {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* ===== Star/note buttons on messages ===== */
.star-btn {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 4px 8px;
  font-size: 10px;
  font-weight: 600;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  cursor: pointer;
  transition: 0.15s;
  line-height: 1.6;
}

.star-btn:hover {
  border-color: #f0ad4e;
  color: #f0ad4e;
}

.star-btn.starred {
  border-color: #f0ad4e;
  color: #f0ad4e;
  background: rgba(240, 173, 78, 0.08);
}

.note-btn {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 4px 8px;
  font-size: 10px;
  font-weight: 600;
  background: var(--bg-main);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-muted);
  cursor: pointer;
  transition: 0.15s;
  line-height: 1.6;
}

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

.note-btn.has-note {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

/* ===== Starred messages modal ===== */
.starred-list {
  padding: 16px 24px;
  max-height: 60vh;
  overflow-y: auto;
}

.starred-item {
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  margin-bottom: 8px;
  cursor: pointer;
  transition: 0.1s;
}

.starred-item:hover {
  border-color: var(--accent);
}

.starred-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
  font-size: 11px;
  color: var(--text-muted);
}

.starred-item-chat {
  font-weight: 600;
  color: var(--accent);
}

.starred-item-content {
  font-size: 13px;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.starred-item-note {
  margin-top: 6px;
  font-size: 11px;
  color: var(--accent);
  font-style: italic;
  padding: 4px 8px;
  background: var(--accent-light);
  border-radius: 4px;
}

.starred-item-actions {
  display: flex;
  gap: 6px;
  margin-top: 8px;
}

.starred-item-actions button {
  font-size: 10px;
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}

.starred-item-actions button:hover {
  border-color: var(--danger);
  color: var(--danger);
}

/* ===== Templates modal ===== */
.templates-layout {
  display: flex;
  height: 420px;
  border-top: 1px solid var(--border);
}

.templates-sidebar {
  width: 200px;
  min-width: 200px;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
}

.templates-sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
}

.templates-sidebar-header .icon-btn {
  font-size: 18px;
  font-weight: 700;
}

#templates-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}

.template-list-item {
  padding: 8px 10px;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  transition: 0.1s;
  margin-bottom: 2px;
}

.template-list-item:hover {
  background: rgba(0,0,0,0.04);
}

.dark-mode .template-list-item:hover {
  background: rgba(255,255,255,0.04);
}

.template-list-item.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 500;
}

.template-list-item .template-tags {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 2px;
}

.templates-editor {
  flex: 1;
  padding: 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.templates-editor-actions {
  display: flex;
  gap: 6px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.templates-editor-actions .primary-btn {
  padding: 8px 16px;
  font-size: 12px;
}

.templates-editor-actions .secondary-btn,
.templates-editor-actions .danger-btn {
  padding: 8px 12px;
  font-size: 11px;
}

@media (max-width: 768px) {
  .templates-layout {
    flex-direction: column;
    height: auto;
  }

  .templates-sidebar {
    width: 100%;
    min-width: auto;
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 140px;
  }
}

/* ===== Generating indicator ===== */
.generating-indicator {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 6px;
  animation: pulse 1s infinite;
  vertical-align: middle;
}

/* ===== Bubble Chat Mode ===== */
.bubble-mode .user-msg {
  background: transparent;
  border-bottom: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  padding: 8px 10%;
}

.bubble-mode .bot-msg {
  background: transparent;
  border-bottom: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  padding: 8px 10%;
}

.bubble-mode .user-msg .bubble {
  background: var(--accent);
  color: #fff;
  padding: 10px 16px;
  border-radius: 18px 18px 4px 18px;
  max-width: 70%;
  word-wrap: break-word;
  line-height: 1.6;
  font-size: 14px;
}

.bubble-mode .bot-msg .bubble {
  background: var(--bg-msg-bot);
  border: 1px solid var(--border);
  padding: 10px 16px;
  border-radius: 18px 18px 18px 4px;
  max-width: 70%;
  word-wrap: break-word;
  line-height: 1.6;
  font-size: 14px;
}

.bubble-mode .user-msg .msg-btn-group,
.bubble-mode .bot-msg .msg-btn-group {
  position: relative;
  bottom: auto;
  right: auto;
  opacity: 1;
  margin-top: 4px;
  width: 100%;
  display: flex;
  gap: 4px;
}

.bubble-mode .user-msg .msg-btn-group {
  justify-content: flex-end;
}

.bubble-mode .bot-msg .msg-btn-group {
  justify-content: flex-start;
}

.bubble-mode .user-msg .msg-actions,
.bubble-mode .bot-msg .msg-actions {
  opacity: 1;
  margin-top: 4px;
  width: 100%;
}

.bubble-mode .user-msg .msg-actions {
  justify-content: flex-end;
}

.bubble-mode .bot-msg .msg-actions {
  justify-content: flex-start;
}

.bubble-mode .star-btn,
.bubble-mode .note-btn {
  position: relative !important;
  bottom: auto !important;
  left: auto !important;
}

/* ===== Raw Request Viewer ===== */
.raw-request-toggle {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  color: var(--text-muted);
  padding: 4px 0;
  user-select: none;
}

.raw-request-toggle:hover {
  color: var(--accent);
}

.raw-request-body {
  display: none;
  background: #1e1e1e;
  color: #d4d4d4;
  padding: 12px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  margin: 4px 0 12px;
  max-height: 300px;
  overflow-y: auto;
}

.raw-request-body.show {
  display: block;
}

.dark-mode .raw-request-body {
  background: #111;
}

/* ===== JSON Output Mode ===== */
.json-output-container {
  background: #1e1e1e;
  color: #d4d4d4;
  padding: 12px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
  margin: 8px 0;
  max-height: 400px;
  overflow-y: auto;
  position: relative;
}

.json-output-container .json-copy-btn {
  position: absolute;
  top: 6px;
  right: 6px;
  padding: 2px 8px;
  font-size: 10px;
  background: #3a3a3a;
  color: #ccc;
  border: none;
  border-radius: 3px;
  cursor: pointer;
}

.json-validation-error {
  color: var(--danger);
  font-size: 12px;
  padding: 6px 10px;
  background: rgba(231, 76, 60, 0.1);
  border-radius: 4px;
  margin: 4px 0;
  border-left: 3px solid var(--danger);
}

/* ===== Selection Mode ===== */
#selection-toolbar {
  display: none;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  flex-wrap: wrap;
}

#selection-toolbar.show {
  display: flex;
}

#selection-toolbar .sel-count {
  font-size: 11px;
  color: var(--text-muted);
  margin-right: auto;
}

#selection-toolbar .sel-btn {
  font-size: 11px;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: 0.1s;
  white-space: nowrap;
}

#selection-toolbar .sel-btn:hover {
  border-color: var(--text-muted);
  color: var(--text-main);
}

#selection-toolbar .sel-btn.danger:hover {
  border-color: var(--danger);
  color: var(--danger);
}

#selection-toolbar .sel-btn.primary-sel:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.sel-toggle-btn {
  font-size: 11px;
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: 0.1s;
  flex-shrink: 0;
}

.sel-toggle-btn:hover {
  border-color: var(--text-muted);
  color: var(--text-main);
}

.sel-toggle-btn.active {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

.history-item .sel-checkbox {
  display: none;
  width: 16px;
  height: 16px;
  cursor: pointer;
  flex-shrink: 0;
  accent-color: var(--accent);
}

.selection-mode .history-item .sel-checkbox {
  display: inline-block;
}

.history-item.selected {
  background: var(--accent-light) !important;
}

.selection-mode .history-item {
  cursor: default;
}

/* ===== Collapsible Sidebar Sections ===== */
.sidebar-section {
  border-top: 1px solid var(--border);
}

.sidebar-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  transition: 0.15s;
  user-select: none;
}

.sidebar-section-header:hover {
  color: var(--text-main);
  background: rgba(0,0,0,0.02);
}

.dark-mode .sidebar-section-header:hover {
  background: rgba(255,255,255,0.03);
}

.sidebar-section-header .section-arrow {
  font-size: 10px;
  transition: transform 0.2s;
}

.sidebar-section-header.collapsed .section-arrow {
  transform: rotate(-90deg);
}

.sidebar-section-body {
  overflow: hidden;
  transition: max-height 0.2s ease;
}

.sidebar-section-body.collapsed {
  max-height: 0 !important;
}

@media (max-width: 768px) {
  .bubble-mode .user-msg,
  .bubble-mode .bot-msg {
    padding: 6px 12px;
  }
  .bubble-mode .user-msg .bubble,
  .bubble-mode .bot-msg .bubble {
    max-width: 85%;
  }
}