/* ============================================
   CC-Web — 和風暖色調 (Japanese Warm Theme)
   ============================================ */

:root {
  /* --- 配色 --- */
  --bg-primary: #faf6f0;           /* 象牙 ivory */
  --bg-secondary: #f2ebe2;         /* 亜麻 flax */
  --bg-tertiary: #e9e0d4;          /* 砂 sand */
  --bg-bubble-user: #c0553a;       /* 朱色 vermillion */
  --bg-bubble-assistant: #fff9f2;  /* 練色 warm white */
  --text-primary: #2d1f14;         /* 黒茶 dark brown */
  --text-secondary: #6b5a4d;       /* 栗色 chestnut */
  --text-muted: #9a8b7d;           /* 灰茶 gray-brown */
  --border-color: #ddd0c0;         /* 枯色 withered */
  --accent: #c0553a;               /* 朱色 vermillion */
  --accent-hover: #a84530;         /* 深朱 deep vermillion */
  --accent-light: #f5ddd4;         /* 薄朱 light vermillion */
  --success: #5d8a54;              /* 抹茶 matcha */
  --danger: #c0553a;
  --info: #5b7ea1;                 /* 縹色 blue-gray */
  --scrollbar-thumb: #c9baa9;
  --scrollbar-track: transparent;
  --sidebar-width: 280px;
  --header-height: 52px;
  --input-max-height: 200px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

/* === Reset === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  height: 100%;
  height: -webkit-fill-available;
}

body {
  height: 100%;
  height: 100dvh;
  min-height: -webkit-fill-available;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Noto Sans CJK SC', Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-primary);
  overflow: hidden;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

/* 全局隐藏原生滚动条，聊天区由 custom-scrollbar 接管 */
::-webkit-scrollbar { display: none; }
* { scrollbar-width: none; }

/* === Login === */
.login-overlay {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #faf6f0 0%, #f0e8dc 50%, #e8dccf 100%);
  z-index: 1000;
}
.login-box {
  text-align: center;
  padding: 48px 36px;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  width: 90%;
  max-width: 360px;
  box-shadow: 0 8px 32px rgba(45, 31, 20, 0.08);
}
.login-logo {
  width: 64px; height: 64px;
  margin: 0 auto 16px;
  background: var(--accent);
  color: #fff;
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: 800;
  letter-spacing: -1px;
}
.login-box h2 {
  font-size: 24px;
  margin-bottom: 4px;
  color: var(--text-primary);
  font-weight: 700;
}
.login-box p {
  color: var(--text-secondary);
  margin-bottom: 28px;
  font-size: 14px;
}
.login-box input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
  margin-bottom: 12px;
  transition: border-color 0.2s;
}
.login-box input:focus { border-color: var(--accent); }
.login-box button {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.login-box button:hover { background: var(--accent-hover); }
.remember-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  cursor: pointer;
  user-select: none;
}
.remember-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}
.login-error {
  color: var(--danger);
  margin-top: 12px;
  font-size: 14px;
}

/* === App Layout === */
.app {
  display: flex;
  height: 100%;
  height: 100dvh;
  min-height: -webkit-fill-available;
  width: 100%;
  overflow: hidden;
}

/* === Sidebar === */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
  overflow: hidden;
}
.sidebar-header {
  padding: 12px;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}
.new-chat-btn {
  width: 100%;
  padding: 10px;
  background: var(--accent);
  border: none;
  border-radius: 10px;
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}
.new-chat-btn:hover { background: var(--accent-hover); }
.session-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  -webkit-overflow-scrolling: touch;
}
.session-item {
  display: flex;
  align-items: center;
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
  margin-bottom: 2px;
  transition: background 0.15s;
  position: relative;
}
.session-item:hover { background: var(--bg-tertiary); }
.session-item.active { background: var(--accent-light); }
.session-item-title {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 14px;
  color: var(--text-primary);
}
.session-item.active .session-item-title { color: var(--accent); font-weight: 500; }
.session-item-time {
  font-size: 11px;
  color: var(--text-muted);
  margin-left: 8px;
  flex-shrink: 0;
}
.session-item-actions {
  display: none;
  gap: 2px;
  margin-left: 4px;
  flex-shrink: 0;
}
.session-item:hover .session-item-actions { display: flex; }
.session-item-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px 5px;
  font-size: 13px;
  border-radius: 4px;
  line-height: 1;
}
.session-item-btn:hover { color: var(--text-primary); background: var(--bg-tertiary); }
.session-item-btn.delete:hover { color: var(--danger); background: var(--accent-light); }
/* Inline edit in sidebar */
.session-item-edit-input {
  flex: 1;
  padding: 2px 6px;
  border: 1px solid var(--accent);
  border-radius: 4px;
  background: #fff;
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  min-width: 0;
}
.sidebar-footer {
  padding: 12px;
  border-top: 1px solid var(--border-color);
  text-align: center;
  flex-shrink: 0;
}
.brand { font-size: 12px; color: var(--text-muted); }

/* === Chat Main === */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  position: relative;
  background: var(--bg-primary);
}
.chat-header {
  height: var(--header-height);
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  padding: 0 16px;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
  gap: 10px;
  flex-shrink: 0;
}
.menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 20px;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
}
.menu-btn:hover { background: var(--bg-tertiary); }
.chat-title {
  flex: 1;
  font-weight: 600;
  font-size: 15px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text-primary);
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 4px;
  transition: background 0.15s;
}
.chat-title:hover { background: var(--bg-tertiary); }
.cost-display {
  font-size: 12px;
  color: var(--text-muted);
  flex-shrink: 0;
  background: var(--bg-tertiary);
  padding: 2px 8px;
  border-radius: 6px;
}
.cost-display:empty { display: none; }

/* Mode selector */
.mode-select {
  -webkit-appearance: none;
  appearance: none;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 4px 24px 4px 10px;
  font-size: 12px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  flex-shrink: 0;
  outline: none;
  transition: border-color 0.15s;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%236b5a4d'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 8px center;
}
.mode-select:focus { border-color: var(--accent); }
.mode-select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* === Messages === */
.messages-wrap {
  flex: 1;
  position: relative;
  overflow: hidden;
  min-height: 0;
}
.messages {
  height: 100%;
  overflow-y: scroll;
  overflow-x: hidden;
  padding: 16px;
  padding-right: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  scrollbar-width: none;
}
.messages::-webkit-scrollbar { display: none; }
/* Custom scrollbar */
.custom-scrollbar {
  position: absolute;
  right: 2px;
  top: 0;
  bottom: 0;
  width: 6px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
}
.messages-wrap:hover .custom-scrollbar,
.custom-scrollbar.active {
  opacity: 1;
}
/* 移动端触摸后 hover 会粘滞 — 完全禁用 hover 触发，只靠 .active（拖动时）显示 */
@media (pointer: coarse) {
  .messages-wrap:hover .custom-scrollbar {
    opacity: 0;
  }
  /* 移动端滚动时用独立的类显示滑块，不走 .active */
  .custom-scrollbar.scrolling {
    opacity: 1;
  }
}
.custom-scrollbar-thumb {
  position: absolute;
  right: 0;
  width: 6px;
  min-height: 30px;
  border-radius: 4px;
  background: var(--scrollbar-thumb);
  cursor: grab;
  transition: width 0.15s, right 0.15s, background 0.15s;
  pointer-events: all;
}
.custom-scrollbar-thumb:hover,
.custom-scrollbar-thumb.dragging {
  width: 12px;
  right: -3px;
  background: #b0a090;
  cursor: grab;
}
.custom-scrollbar-thumb.dragging { cursor: grabbing; }
/* 移动端触摸设备：加宽滑块与轨道，便于手指操作；默认隐藏，拖动时显示 */
@media (pointer: coarse) {
  .custom-scrollbar {
    width: 18px;
    right: 0;
    opacity: 0;
  }
  .custom-scrollbar.active {
    opacity: 1;
  }
  .custom-scrollbar-thumb {
    width: 8px;
    right: 5px;
    min-height: 40px;
    border-radius: 4px;
  }
  .custom-scrollbar-thumb:hover,
  .custom-scrollbar-thumb.dragging {
    width: 14px;
    right: 2px;
  }
}
.welcome-msg {
  text-align: center;
  margin: auto;
  padding: 40px 20px;
  color: var(--text-secondary);
}
.welcome-icon {
  font-size: 48px;
  margin-bottom: 12px;
  opacity: 0.6;
}
.welcome-msg h3 {
  font-size: 20px;
  color: var(--text-primary);
  margin-bottom: 8px;
  font-weight: 600;
}
.welcome-msg p { font-size: 14px; }

/* Message Bubbles */
.msg {
  display: flex;
  gap: 10px;
  max-width: 85%;
  min-width: 0;
  animation: fadeIn 0.25s ease;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
.msg.user { align-self: flex-end; flex-direction: row-reverse; }
.msg.assistant { align-self: flex-start; }

.msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
}
.msg.user .msg-avatar { background: var(--bg-bubble-user); color: #fff; }
.msg.assistant .msg-avatar { background: var(--success); color: #fff; }

.msg-bubble {
  padding: 12px 16px;
  border-radius: 16px;
  line-height: 1.65;
  word-break: break-word;
  min-width: 0;
  max-width: 100%;
}
.msg.user .msg-bubble {
  background: var(--bg-bubble-user);
  color: #fff;
  border-bottom-right-radius: 4px;
}
.msg.assistant .msg-bubble {
  background: var(--bg-bubble-assistant);
  border: 1px solid var(--border-color);
  border-bottom-left-radius: 4px;
  color: var(--text-primary);
}

/* System messages */
.msg.system {
  align-self: center;
  max-width: 90%;
}
.msg.system .msg-bubble {
  background: var(--bg-tertiary);
  border: 1px dashed var(--border-color);
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 13px;
  padding: 10px 16px;
  text-align: center;
  white-space: pre-line;
}

/* Markdown content */
.msg-bubble p { margin: 0 0 8px 0; }
.msg-bubble p:last-child { margin-bottom: 0; }
.msg-bubble ul, .msg-bubble ol { margin: 4px 0 8px 20px; }
.msg-bubble li { margin-bottom: 2px; }
.msg-bubble h1, .msg-bubble h2, .msg-bubble h3, .msg-bubble h4 {
  margin: 12px 0 6px 0;
}
.msg-bubble h1 { font-size: 1.3em; }
.msg-bubble h2 { font-size: 1.15em; }
.msg-bubble h3 { font-size: 1.05em; }
.msg-bubble a { color: var(--info); text-decoration: none; }
.msg-bubble a:hover { text-decoration: underline; }
.msg-bubble blockquote {
  border-left: 3px solid var(--border-color);
  padding-left: 12px;
  color: var(--text-secondary);
  margin: 8px 0;
}
.msg-bubble table {
  border-collapse: collapse;
  margin: 8px 0;
  font-size: 13px;
  width: 100%;
  overflow-x: auto;
  display: block;
}
.msg-bubble th, .msg-bubble td {
  border: 1px solid var(--border-color);
  padding: 6px 10px;
  text-align: left;
}
.msg-bubble th { background: var(--bg-secondary); }

/* Inline code */
.msg-bubble code:not(pre code) {
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.88em;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  color: var(--accent);
}
.msg.user .msg-bubble code:not(pre code) {
  background: rgba(255,255,255,0.2);
  color: #fff;
}

/* Code blocks */
.code-block-wrapper {
  position: relative;
  margin: 8px 0;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  max-width: 100%;
}
.code-block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 6px 12px;
  background: #2b2b2b;
  font-size: 12px;
  color: #999;
}
.code-block-actions {
  display: flex;
  gap: 4px;
  align-items: center;
}
.code-copy-btn, .code-preview-btn {
  background: none;
  border: none;
  color: #999;
  cursor: pointer;
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 4px;
}
.code-copy-btn:hover, .code-preview-btn:hover { color: #fff; background: #444; }
.code-preview-btn { border: 1px solid #555; }
.code-block-wrapper pre {
  margin: 0;
  padding: 12px;
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
  -webkit-overflow-scrolling: touch;
}
.code-block-wrapper pre code {
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 13px;
  line-height: 1.5;
  white-space: pre;
}
/* HTML/SVG preview pane */
.code-preview-pane {
  display: none;
  background: #fff;
  border-top: 1px solid var(--border-color);
}
.code-preview-iframe {
  width: 100%;
  min-height: 120px;
  max-height: 600px;
  border: none;
  display: block;
}
.code-block-wrapper.preview-mode .code-preview-pane { display: block; }
.code-block-wrapper.preview-mode pre { display: none; }

/* Tool calls */
.tool-call {
  margin: 8px 0;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
}
.tool-call summary {
  padding: 8px 12px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
  user-select: none;
  list-style: none;
}
.tool-call summary::-webkit-details-marker { display: none; }
.tool-call summary::before {
  content: '▸';
  font-size: 11px;
  transition: transform 0.2s;
}
.tool-call[open] summary::before { transform: rotate(90deg); }
.tool-call summary:hover { background: var(--bg-tertiary); }
.tool-call-icon {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.tool-call-icon.done { background: var(--success); }
.tool-call-icon.running { background: #d4a33a; animation: pulse 1s infinite; }
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}
.tool-call-content {
  padding: 8px 12px;
  font-size: 12px;
  color: var(--text-secondary);
  background: var(--bg-primary);
  max-height: 250px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
  font-family: 'SF Mono', monospace;
}

/* AskUserQuestion preview */
.ask-user-question {
  padding: 10px 12px;
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.ask-question-card {
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: #fff;
  padding: 10px;
}
.ask-question-header {
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 6px;
}
.ask-question-text {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-primary);
  margin-bottom: 8px;
}
/* 左右分栏布局 */
.ask-options-layout {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.ask-options-layout.has-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto;
  gap: 8px;
  align-items: start;
}
.ask-question-options {
  display: flex;
  flex-direction: column;
  gap: 6px;
  grid-row: 1;
  grid-column: 1;
}
/* 右侧预览区 */
.ask-option-preview {
  grid-row: 1;
  grid-column: 2;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-secondary);
  min-height: 60px;
  transition: background 0.15s;
  white-space: pre-wrap;
  word-break: break-word;
}
/* 确认按钮 — 仅移动端 */
.ask-confirm-btn {
  display: none;
  grid-row: 2;
  grid-column: 1 / -1;
  width: 100%;
  padding: 9px 0;
  border: 1.5px solid var(--accent);
  border-radius: 8px;
  background: transparent;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
}
.ask-confirm-btn:active {
  background: var(--accent);
  color: #fff;
}
@media (pointer: coarse) {
  .ask-confirm-btn { display: block; }
}
.ask-option-item {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px;
  background: var(--bg-secondary);
  width: 100%;
  text-align: left;
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s;
}
.ask-option-item:hover {
  background: var(--accent-light);
  border-color: var(--accent);
}
.ask-option-item.ask-option-selected {
  background: var(--accent-light);
  border-color: var(--accent);
}
.ask-option-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
}
.ask-option-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.45;
  margin-top: 4px;
}

/* Typing indicator */
.typing-indicator {
  display: inline-flex;
  gap: 5px;
  padding: 8px 4px;
}
.typing-indicator span {
  width: 7px; height: 7px;
  background: var(--accent);
  border-radius: 50%;
  opacity: 0.5;
  animation: bounce 1.4s infinite;
}
.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }
@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0); }
  30% { transform: translateY(-7px); }
}

/* === Slash Command Menu === */
.cmd-menu {
  position: absolute;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(45, 31, 20, 0.12);
  padding: 6px;
  min-width: 240px;
  max-width: 320px;
  z-index: 50;
}
.cmd-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.12s;
}
.cmd-item:hover, .cmd-item.active { background: var(--accent-light); }
.cmd-item-cmd {
  font-weight: 600;
  font-size: 14px;
  color: var(--accent);
  white-space: nowrap;
}
.cmd-item-desc {
  font-size: 13px;
  color: var(--text-secondary);
}

/* === Input Area === */
.input-area {
  padding: 10px 16px;
  padding-bottom: max(14px, var(--safe-bottom));
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  flex-shrink: 0;
}
.input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 8px 12px;
  max-width: 800px;
  margin: 0 auto;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.input-wrapper:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}
#msg-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 15px;
  font-family: inherit;
  line-height: 1.5;
  resize: none;
  outline: none;
  max-height: var(--input-max-height);
  min-height: 24px;
  overflow-y: auto;
}
#msg-input::placeholder { color: var(--text-muted); }
.send-btn, .abort-btn {
  width: 36px; height: 36px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: background 0.15s, transform 0.1s;
}
.send-btn:active, .abort-btn:active { transform: scale(0.92); }
.send-btn {
  background: var(--accent);
  color: #fff;
}
.send-btn:hover { background: var(--accent-hover); }
.send-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.abort-btn {
  background: var(--danger);
  color: #fff;
}
.abort-btn:hover { background: var(--accent-hover); }

/* === Option Picker === */
.option-picker {
  position: absolute;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 14px;
  box-shadow: 0 8px 32px rgba(45, 31, 20, 0.15);
  padding: 16px;
  min-width: 280px;
  max-width: 380px;
  z-index: 50;
  animation: fadeIn 0.2s ease;
}
.option-picker-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 12px;
  padding: 0 4px;
}
.option-picker-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.12s;
  margin-bottom: 4px;
}
.option-picker-item:last-child { margin-bottom: 0; }
.option-picker-item:hover { background: var(--accent-light); }
.option-picker-item.active {
  background: var(--accent-light);
  outline: 1px solid var(--accent);
}
.option-picker-item-info { flex: 1; min-width: 0; }
.option-picker-item-label {
  font-weight: 600;
  font-size: 15px;
  color: var(--text-primary);
}
.option-picker-item-desc {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 2px;
}
.option-picker-item-check {
  color: var(--accent);
  font-size: 16px;
  font-weight: 700;
  flex-shrink: 0;
}

/* === Mobile === */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    z-index: 100;
    transform: translateX(-100%);
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay {
    position: fixed; inset: 0;
    background: rgba(45, 31, 20, 0.3);
    z-index: 99;
  }
  .menu-btn { display: block; }
  .msg { max-width: 95%; }
  .input-area { padding: 8px 10px; padding-bottom: max(10px, var(--safe-bottom)); }
  .messages { padding: 12px 8px; gap: 10px; }
  .session-item-actions { display: flex; }
  .cmd-menu { left: 10px; right: 10px; transform: none; min-width: auto; bottom: 72px; }
  .option-picker { left: 10px; right: 10px; transform: none; min-width: auto; bottom: 72px; }
}

@media (max-width: 480px) {
  .msg-avatar { width: 28px; height: 28px; font-size: 12px; border-radius: 8px; }
  .msg-bubble { padding: 10px 12px; font-size: 14px; border-radius: 14px; }
  .msg.user .msg-bubble { border-bottom-right-radius: 4px; }
  .msg.assistant .msg-bubble { border-bottom-left-radius: 4px; }
  .code-block-wrapper pre code { font-size: 12px; }
  .input-wrapper { padding: 6px 10px; border-radius: 12px; }
  .send-btn, .abort-btn { width: 34px; height: 34px; }
}

/* === Utility === */
[hidden] { display: none !important; }

/* === Toast Notification === */
.toast-notification {
  position: fixed;
  top: 16px;
  right: 16px;
  background: var(--success);
  color: #fff;
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  z-index: 200;
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 0.3s, transform 0.3s;
}
.toast-notification.show {
  opacity: 1;
  transform: translateY(0);
}

/* === Session Unread Dot === */
.session-unread-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  flex-shrink: 0;
  margin-left: 4px;
}

/* === Settings Button (sidebar) === */
.settings-btn {
  background: none;
  border: none;
  font-size: 18px;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px 8px;
  border-radius: 6px;
  transition: color 0.15s, background 0.15s;
  vertical-align: middle;
  margin-right: 8px;
}
.settings-btn:hover { color: var(--text-primary); background: var(--bg-tertiary); }

/* === Settings Overlay & Panel === */
.settings-overlay {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(45, 31, 20, 0.4);
  z-index: 1000;
  animation: fadeIn 0.2s ease;
}
.settings-panel {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  width: 90%;
  max-width: 420px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 8px 32px rgba(45, 31, 20, 0.12);
  padding: 32px 28px;
  animation: fadeIn 0.25s ease;
}
.settings-panel h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.settings-panel h3 .settings-close {
  margin-left: auto;
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--text-muted);
  padding: 2px 6px;
  border-radius: 6px;
}
.settings-panel h3 .settings-close:hover { color: var(--text-primary); background: var(--bg-tertiary); }
.settings-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
}
.settings-header h3 {
  margin-bottom: 0;
  flex: 1;
}
.settings-header .settings-close {
  margin-left: auto;
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--text-muted);
  padding: 2px 6px;
  border-radius: 6px;
}
.settings-header .settings-close:hover { color: var(--text-primary); background: var(--bg-tertiary); }
.settings-field {
  margin-bottom: 16px;
}
.settings-field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.settings-field input,
.settings-select {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}
.settings-field input:focus,
.settings-select:focus { border-color: var(--accent); }
.settings-select {
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%236b5a4d'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}
.settings-actions {
  display: flex;
  gap: 10px;
  margin-top: 24px;
}
.settings-actions button {
  flex: 1;
  padding: 10px;
  border: none;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  font-family: inherit;
}
.settings-actions .btn-test {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.settings-actions .btn-test:hover { background: var(--bg-secondary); }
.settings-actions .btn-save {
  background: var(--accent);
  color: #fff;
}
.settings-actions .btn-save:hover { background: var(--accent-hover); }
.settings-status {
  margin-top: 12px;
  font-size: 13px;
  text-align: center;
  min-height: 20px;
}
.settings-status.success { color: var(--success); }
.settings-status.error { color: var(--danger); }

@media (max-width: 768px) {
  .settings-panel { padding: 24px 20px; border-radius: 16px; }
}
@media (max-width: 480px) {
  .settings-panel { width: 95%; padding: 20px 16px; }
}

/* === Force Change Password Overlay === */
.force-change-overlay {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: rgba(45, 31, 20, 0.6);
  z-index: 2000;
  animation: fadeIn 0.25s ease;
}
.force-change-panel {
  text-align: center;
  padding: 48px 36px;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  width: 90%;
  max-width: 400px;
  box-shadow: 0 8px 32px rgba(45, 31, 20, 0.15);
  animation: fadeIn 0.25s ease;
}
.force-change-panel .login-logo {
  width: 56px; height: 56px;
  margin: 0 auto 12px;
  background: var(--accent);
  color: #fff;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 800;
}
.force-change-panel h2 {
  font-size: 22px;
  margin-bottom: 4px;
  color: var(--text-primary);
  font-weight: 700;
}
.force-change-panel p {
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-size: 14px;
}
.force-change-form input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 15px;
  outline: none;
  margin-bottom: 10px;
  transition: border-color 0.2s;
}
.force-change-form input:focus { border-color: var(--accent); }
.fc-submit-btn {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
  margin-top: 6px;
}
.fc-submit-btn:hover:not(:disabled) { background: var(--accent-hover); }
.fc-submit-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.fc-status {
  margin-top: 10px;
  font-size: 13px;
  min-height: 18px;
  color: var(--text-secondary);
}
.fc-status.error { color: var(--danger); }
.fc-status.success { color: var(--success); }

/* === Password Hint === */
.password-hint {
  font-size: 12px;
  color: var(--text-muted);
  margin: -4px 0 10px 2px;
  text-align: left;
}
.password-hint.error { color: var(--danger); }
.password-hint.success { color: var(--success); }

/* === Settings Divider === */
.settings-divider {
  height: 1px;
  background: var(--border-color);
  margin: 24px 0;
}

/* === Settings Section Title === */
.settings-section-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 14px;
}