/* ═══════════════════════════════════════════════════════════
   iReDev Frontend — 样式表
   三栏式对话界面：左侧边栏 / 中间对话 / 右侧制品池
   ═══════════════════════════════════════════════════════════ */

/* ── CSS 变量 ──────────────────────────────────────────── */
:root {
  /* 颜色 */
  --c-bg:           #f0f2f5;
  --c-surface:      #ffffff;
  --c-sidebar:      #1a1a2e;
  --c-sidebar-hover:#252547;
  --c-sidebar-text: #c4c4d4;
  --c-primary:      #6366f1;
  --c-primary-light:#818cf8;
  --c-primary-bg:   #eef2ff;
  --c-text:         #1e1e2e;
  --c-text-secondary:#6b7280;
  --c-border:       #e5e7eb;
  --c-success:      #10b981;
  --c-warning:      #f59e0b;
  --c-error:        #ef4444;

  /* Agent 颜色 */
  --c-agent-system:      #6b7280;
  --c-agent-interviewer: #3b82f6;
  --c-agent-customer:    #10b981;
  --c-agent-enduser:     #06b6d4;
  --c-agent-analyst:     #8b5cf6;
  --c-agent-archivist:   #f59e0b;
  --c-agent-reviewer:    #ef4444;
  --c-agent-user:        #6366f1;

  /* 间距 */
  --sidebar-width:  280px;
  --artifact-width: 360px;
  --radius:         12px;
  --radius-sm:      8px;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", Consolas, monospace;

  /* 过渡 */
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── 重置 & 基础 ───────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}

/* ── 三栏布局 ──────────────────────────────────────────── */
.app-layout {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* ═══════════════════════════════════════════════════════════
   左侧边栏
   ═══════════════════════════════════════════════════════════ */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--c-sidebar);
  color: var(--c-sidebar-text);
  display: flex;
  flex-direction: column;
  border-right: 1px solid rgba(255,255,255,0.06);
  transition: margin-left var(--transition);
  z-index: 20;
}

.sidebar.collapsed {
  margin-left: calc(-1 * var(--sidebar-width));
}

.sidebar-header {
  padding: 20px 20px 12px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.logo svg {
  color: var(--c-primary-light);
}

.new-project-btn {
  margin: 16px 16px 8px;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: rgba(99, 102, 241, 0.15);
  color: var(--c-primary-light);
  border: 1px dashed rgba(99, 102, 241, 0.4);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition);
}

.new-project-btn:hover {
  background: rgba(99, 102, 241, 0.25);
  border-color: var(--c-primary-light);
}

.sidebar-section-label {
  padding: 16px 20px 6px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: rgba(255,255,255,0.35);
  font-weight: 600;
}

.session-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px;
}

.session-list::-webkit-scrollbar {
  width: 4px;
}

.session-list::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.15);
  border-radius: 2px;
}

.session-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition);
  margin-bottom: 2px;
}

.session-item:hover {
  background: var(--c-sidebar-hover);
}

.session-item.active {
  background: rgba(99, 102, 241, 0.2);
  color: #fff;
}

.session-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.session-dot.running  { background: var(--c-success); animation: pulse 2s infinite; }
.session-dot.idle     { background: var(--c-text-secondary); }
.session-dot.completed { background: var(--c-primary-light); }
.session-dot.error    { background: var(--c-error); }
.session-dot.waiting_input { background: var(--c-warning); animation: pulse 2s infinite; }

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

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

.session-name {
  font-size: 13px;
  font-weight: 500;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.session-date {
  font-size: 11px;
  color: rgba(255,255,255,0.4);
  margin-top: 1px;
}

.empty-state {
  text-align: center;
  padding: 32px 16px;
  color: rgba(255,255,255,0.3);
  font-size: 13px;
}

.sidebar-footer {
  padding: 12px 20px;
  border-top: 1px solid rgba(255,255,255,0.08);
  text-align: center;
}

.version {
  font-size: 11px;
  color: rgba(255,255,255,0.25);
}

/* ═══════════════════════════════════════════════════════════
   中间对话区
   ═══════════════════════════════════════════════════════════ */
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--c-bg);
  position: relative;
}

/* ── 欢迎页 ────────────────────────────────────────────── */
.welcome-screen {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.welcome-content {
  text-align: center;
  max-width: 640px;
  padding: 40px;
}

.welcome-icon {
  color: var(--c-primary);
  margin-bottom: 16px;
}

.welcome-content h1 {
  font-size: 32px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 4px;
}

.welcome-content > p {
  font-size: 16px;
  color: var(--c-text-secondary);
}

.welcome-desc {
  margin-top: 16px;
  font-size: 14px;
  color: var(--c-text-secondary);
  line-height: 1.8;
}

.feature-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.feature-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  transition: all var(--transition);
}

.feature-card:hover {
  border-color: var(--c-primary);
  box-shadow: 0 4px 20px rgba(99,102,241,0.1);
  transform: translateY(-2px);
}

.feature-emoji {
  font-size: 28px;
  display: block;
  margin-bottom: 8px;
}

.feature-card strong {
  display: block;
  font-size: 14px;
  color: var(--c-text);
  margin-bottom: 4px;
}

.feature-card p {
  font-size: 12px;
  color: var(--c-text-secondary);
}

/* ── 对话容器 ──────────────────────────────────────────── */
.chat-container {
  display: flex;
  flex-direction: column;
  height: 100%;
}

/* 头部 */
.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  z-index: 10;
}

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

.chat-header-left h2 {
  font-size: 16px;
  font-weight: 600;
}

.chat-header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.sidebar-toggle,
.artifact-toggle {
  background: none;
  border: none;
  color: var(--c-text-secondary);
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: all var(--transition);
}

.sidebar-toggle:hover,
.artifact-toggle:hover {
  background: var(--c-primary-bg);
  color: var(--c-primary);
}

.artifact-count {
  position: absolute;
  top: -2px;
  right: -4px;
  background: var(--c-primary);
  color: #fff;
  font-size: 10px;
  min-width: 16px;
  height: 16px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--c-bg);
  border-radius: 20px;
  font-size: 12px;
  color: var(--c-text-secondary);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--c-text-secondary);
}

.status-badge.running .status-dot    { background: var(--c-success); animation: pulse 2s infinite; }
.status-badge.waiting .status-dot    { background: var(--c-warning); animation: pulse 2s infinite; }
.status-badge.completed .status-dot  { background: var(--c-primary); }
.status-badge.error .status-dot      { background: var(--c-error); }

/* ── 消息列表 ──────────────────────────────────────────── */
.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 16px 0;
}

.messages-container::-webkit-scrollbar {
  width: 6px;
}

.messages-container::-webkit-scrollbar-thumb {
  background: rgba(0,0,0,0.15);
  border-radius: 3px;
}

.messages-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 单条消息 */
.message {
  display: flex;
  gap: 12px;
  padding: 12px 0;
  animation: fadeInUp 0.3s ease;
}

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

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 16px;
  color: #fff;
  font-weight: 600;
}

.message-body {
  flex: 1;
  min-width: 0;
}

.message-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.message-agent-name {
  font-size: 13px;
  font-weight: 600;
}

.message-time {
  font-size: 11px;
  color: var(--c-text-secondary);
}

.message-content {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-text);
  word-wrap: break-word;
}

.message-content p {
  margin-bottom: 8px;
}

.message-content p:last-child {
  margin-bottom: 0;
}

.message-content ul,
.message-content ol {
  padding-left: 20px;
  margin-bottom: 8px;
}

.message-content pre {
  background: #f6f8fa;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 8px 0;
  font-family: var(--font-mono);
  font-size: 13px;
}

.message-content code {
  background: #f0f0f0;
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 13px;
}

.message-content pre code {
  background: none;
  padding: 0;
}

/* 系统消息 */
.message.system-message {
  justify-content: center;
}

.message.system-message .message-body {
  background: var(--c-primary-bg);
  border: 1px solid rgba(99, 102, 241, 0.15);
  border-radius: var(--radius);
  padding: 10px 16px;
  text-align: center;
  max-width: 600px;
}

.message.system-message .message-content {
  font-size: 13px;
  color: var(--c-primary);
}

.message.system-message .message-avatar {
  display: none;
}

.message.system-message .message-header {
  display: none;
}

/* 用户消息 */
.message.user-message {
  flex-direction: row-reverse;
}

.message.user-message .message-body {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.message.user-message .message-content {
  background: var(--c-primary);
  color: #fff;
  border-radius: var(--radius) 4px var(--radius) var(--radius);
  padding: 10px 16px;
  max-width: 80%;
}

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

/* Typing 指示器 */
.typing-indicator {
  display: flex;
  gap: 4px;
  padding: 12px 16px;
}

.typing-dot {
  width: 8px;
  height: 8px;
  background: var(--c-text-secondary);
  border-radius: 50%;
  animation: typingBounce 1.4s infinite both;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* ── 输入区域 ──────────────────────────────────────────── */
.input-area {
  padding: 0 24px 20px;
  max-width: 860px;
  margin: 0 auto;
  width: 100%;
}

.candidates-bar {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 8px;
}

.candidates-label {
  font-size: 12px;
  color: var(--c-text-secondary);
  margin-bottom: 8px;
}

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

.candidate-option {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  cursor: pointer;
  font-size: 13px;
  color: var(--c-text);
  text-align: left;
  transition: all var(--transition);
  line-height: 1.5;
}

.candidate-option:hover {
  border-color: var(--c-primary);
  background: var(--c-primary-bg);
}

.candidate-option .candidate-num {
  display: inline-block;
  background: var(--c-primary);
  color: #fff;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  text-align: center;
  line-height: 20px;
  font-size: 11px;
  font-weight: 600;
  margin-right: 8px;
}

.input-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 8px 8px 8px 16px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.input-row:focus-within {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.input-row textarea {
  flex: 1;
  border: none;
  outline: none;
  resize: none;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  color: var(--c-text);
  background: transparent;
  max-height: 120px;
  padding: 4px 0;
}

.input-row textarea::placeholder {
  color: #bbb;
}

.input-row textarea:disabled {
  cursor: not-allowed;
}

.send-btn {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: none;
  background: var(--c-primary);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition);
}

.send-btn:hover:not(:disabled) {
  background: #4f46e5;
  transform: scale(1.05);
}

.send-btn:disabled {
  background: #d1d5db;
  cursor: not-allowed;
}

/* ═══════════════════════════════════════════════════════════
   右侧制品面板
   ═══════════════════════════════════════════════════════════ */
.artifact-panel {
  width: var(--artifact-width);
  min-width: var(--artifact-width);
  background: var(--c-surface);
  border-left: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  transition: margin-right var(--transition);
  z-index: 20;
}

.artifact-panel.collapsed {
  margin-right: calc(-1 * var(--artifact-width));
}

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

.artifact-panel-header h3 {
  font-size: 15px;
  font-weight: 600;
}

.close-panel-btn {
  background: none;
  border: none;
  color: var(--c-text-secondary);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: all var(--transition);
}

.close-panel-btn:hover {
  background: #f3f4f6;
  color: var(--c-text);
}

/* 进度条 */
.pipeline-progress {
  padding: 16px 20px;
  border-bottom: 1px solid var(--c-border);
}

.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--c-text-secondary);
  margin-bottom: 8px;
}

.progress-bar {
  height: 6px;
  background: var(--c-bg);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--c-primary), var(--c-primary-light));
  border-radius: 3px;
  transition: width 0.5s ease;
}

/* 制品列表 */
.artifact-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 12px;
}

.artifact-list::-webkit-scrollbar {
  width: 4px;
}

.artifact-list::-webkit-scrollbar-thumb {
  background: rgba(0,0,0,0.1);
  border-radius: 2px;
}

.artifact-group {
  margin-bottom: 16px;
}

.artifact-group-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--c-text-secondary);
  padding: 8px 8px 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.artifact-group-items {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.empty-artifact {
  font-size: 12px;
  color: #ccc;
  padding: 8px 8px;
  text-align: left;
}

.artifact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.artifact-item:hover {
  background: var(--c-primary-bg);
}

.artifact-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  flex-shrink: 0;
}

.artifact-icon.doc   { background: #dbeafe; }
.artifact-icon.model { background: #ede9fe; }
.artifact-icon.review { background: #fee2e2; }
.artifact-icon.image { background: #d1fae5; }

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

.artifact-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--c-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.artifact-time {
  font-size: 11px;
  color: var(--c-text-secondary);
}

.artifact-status-icon {
  font-size: 14px;
}

/* ═══════════════════════════════════════════════════════════
   制品查看器
   ═══════════════════════════════════════════════════════════ */
.artifact-viewer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.artifact-viewer {
  width: min(900px, 90vw);
  max-height: 85vh;
  background: var(--c-surface);
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.artifact-viewer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--c-border);
}

.artifact-viewer-header h3 {
  font-size: 16px;
  font-weight: 600;
}

.close-viewer-btn {
  background: none;
  border: none;
  color: var(--c-text-secondary);
  cursor: pointer;
  padding: 6px;
  border-radius: 6px;
  transition: all var(--transition);
}

.close-viewer-btn:hover {
  background: #f3f4f6;
  color: var(--c-text);
}

.artifact-viewer-content {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  font-size: 14px;
  line-height: 1.8;
}

.artifact-viewer-content::-webkit-scrollbar {
  width: 6px;
}

.artifact-viewer-content::-webkit-scrollbar-thumb {
  background: rgba(0,0,0,0.15);
  border-radius: 3px;
}

/* Markdown 渲染样式 */
.artifact-viewer-content h1 { font-size: 24px; margin: 20px 0 12px; font-weight: 700; }
.artifact-viewer-content h2 { font-size: 20px; margin: 18px 0 10px; font-weight: 600; border-bottom: 1px solid var(--c-border); padding-bottom: 6px; }
.artifact-viewer-content h3 { font-size: 16px; margin: 14px 0 8px; font-weight: 600; }
.artifact-viewer-content h4 { font-size: 14px; margin: 12px 0 6px; font-weight: 600; }
.artifact-viewer-content p  { margin-bottom: 10px; }
.artifact-viewer-content ul,
.artifact-viewer-content ol { padding-left: 24px; margin-bottom: 10px; }
.artifact-viewer-content li { margin-bottom: 4px; }

.artifact-viewer-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0;
  font-size: 13px;
}

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

.artifact-viewer-content th {
  background: var(--c-bg);
  font-weight: 600;
}

.artifact-viewer-content pre {
  background: #f6f8fa;
  padding: 16px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 12px 0;
}

.artifact-viewer-content code {
  font-family: var(--font-mono);
  font-size: 13px;
}

.artifact-viewer-content blockquote {
  border-left: 4px solid var(--c-primary);
  padding: 8px 16px;
  margin: 12px 0;
  background: var(--c-primary-bg);
  color: var(--c-text);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* 制品查看器中的图片 */
.artifact-viewer-content img {
  max-width: 100%;
  border-radius: var(--radius-sm);
}

/* ═══════════════════════════════════════════════════════════
   模态框
   ═══════════════════════════════════════════════════════════ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}

.modal {
  background: var(--c-surface);
  border-radius: var(--radius);
  padding: 28px 32px;
  width: min(440px, 90vw);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  animation: slideUp 0.3s ease;
}

.modal h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 6px;
}

.modal p {
  font-size: 14px;
  color: var(--c-text-secondary);
  margin-bottom: 16px;
}

.modal input[type="text"] {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font-sans);
  color: var(--c-text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.modal input[type="text"]:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 20px;
}

/* ── 语言选择器 ────────────────────────────────────────── */
.language-select-group {
  margin-top: 16px;
}

.language-select-group > label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--c-text-secondary);
  margin-bottom: 8px;
}

.language-options {
  display: flex;
  gap: 12px;
}

.language-option {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 2px solid var(--c-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  flex: 1;
  justify-content: center;
}

.language-option:hover {
  border-color: var(--c-primary-light);
  background: var(--c-primary-bg);
}

.language-option input[type="radio"] {
  display: none;
}

.language-option input[type="radio"]:checked + .language-label {
  font-weight: 600;
  color: var(--c-primary);
}

.language-option:has(input[type="radio"]:checked) {
  border-color: var(--c-primary);
  background: var(--c-primary-bg);
}

.language-label {
  font-size: 14px;
  color: var(--c-text);
  user-select: none;
}

.control-mode-hint {
  margin-top: 6px;
  font-size: 12px;
  color: var(--c-text-secondary);
  padding: 4px 8px;
  min-height: 20px;
}

.btn-primary,
.btn-secondary {
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}

.btn-primary {
  background: var(--c-primary);
  color: #fff;
}

.btn-primary:hover {
  background: #4f46e5;
}

.btn-secondary {
  background: var(--c-bg);
  color: var(--c-text);
  border: 1px solid var(--c-border);
}

.btn-secondary:hover {
  background: #e5e7eb;
}

/* ═══════════════════════════════════════════════════════════
   Agent 活动指示器
   ═══════════════════════════════════════════════════════════ */
.agent-activity-indicator {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  margin: 8px 0;
  max-width: 860px;
  background: var(--c-surface);
  border-radius: var(--radius);
  border-left: 3px solid var(--activity-color, var(--c-primary));
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
  animation: activitySlideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.activity-glow {
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  opacity: 0.6;
  filter: blur(6px);
  animation: glowPulse 2s ease-in-out infinite;
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.3; filter: blur(4px); }
  50% { opacity: 0.8; filter: blur(8px); }
}

.agent-activity-indicator::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.06) 50%, transparent 100%);
  animation: shimmer 2.5s ease-in-out infinite;
  pointer-events: none;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

@keyframes activitySlideIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.activity-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
  color: #fff;
  position: relative;
  z-index: 1;
  animation: avatarPulse 2s ease-in-out infinite;
}

@keyframes avatarPulse {
  0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 var(--activity-color, rgba(99,102,241,0.4)); }
  50% { transform: scale(1.05); box-shadow: 0 0 0 8px transparent; }
}

.activity-body {
  flex: 1;
  min-width: 0;
  position: relative;
  z-index: 1;
}

.activity-agent-name {
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 3px;
}

.activity-text {
  font-size: 13px;
  color: var(--c-text-secondary);
  margin-bottom: 8px;
  line-height: 1.5;
}

.activity-progress {
  display: flex;
  align-items: center;
  gap: 10px;
}

.activity-dots {
  display: flex;
  gap: 5px;
}

.activity-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--activity-color, var(--c-primary));
  animation: activityBounce 1.4s infinite both;
}

.activity-dot:nth-child(2) { animation-delay: 0.2s; }
.activity-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes activityBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.3; }
  30% { transform: translateY(-5px); opacity: 1; }
}

.activity-elapsed {
  font-size: 11px;
  color: var(--c-text-secondary);
  opacity: 0.7;
  font-variant-numeric: tabular-nums;
  font-family: var(--font-mono);
  min-width: 32px;
}

.agent-activity-indicator.fade-out {
  animation: activityFadeOut 0.3s ease forwards;
}

@keyframes activityFadeOut {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(-8px); }
}

/* ═══════════════════════════════════════════════════════════
   加载动画
   ═══════════════════════════════════════════════════════════ */
.loading-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--c-border);
  border-top-color: var(--c-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 40px auto;
}

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

/* ═══════════════════════════════════════════════════════════
   响应式
   ═══════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .artifact-panel {
    position: fixed;
    right: 0;
    top: 0;
    bottom: 0;
    box-shadow: -4px 0 20px rgba(0,0,0,0.15);
  }
  .artifact-panel.collapsed {
    margin-right: calc(-1 * var(--artifact-width));
  }
}

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    box-shadow: 4px 0 20px rgba(0,0,0,0.15);
    z-index: 30;
  }
  .feature-cards {
    grid-template-columns: 1fr;
  }
  .auth-modal {
    padding: 24px 20px;
  }
  .welcome-auth-actions {
    flex-direction: column;
    align-items: center;
  }
}

/* ═══════════════════════════════════════════════════════════
   登录/注册弹窗
   ═══════════════════════════════════════════════════════════ */
.auth-modal {
  width: min(420px, 90vw);
  position: relative;
  padding: 32px 28px;
}

.auth-modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  color: var(--c-text-secondary);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.auth-modal-close:hover {
  background: #f3f4f6;
  color: var(--c-text);
}

.auth-modal-header {
  text-align: center;
  margin-bottom: 20px;
}

.auth-modal-header svg {
  margin-bottom: 8px;
}

.auth-modal-header h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--c-text);
}

.auth-tabs {
  display: flex;
  border-bottom: 2px solid var(--c-border);
  margin-bottom: 20px;
}

.auth-tab {
  flex: 1;
  padding: 10px 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  transition: all var(--transition);
}

.auth-tab:hover {
  color: var(--c-text);
}

.auth-tab.active {
  color: var(--c-primary);
  border-bottom-color: var(--c-primary);
  font-weight: 600;
}

.auth-form {
  display: none;
}

.auth-form.active {
  display: block;
}

.auth-error {
  font-size: 13px;
  color: var(--c-error);
  min-height: 20px;
  margin-bottom: 8px;
  text-align: left;
}

.auth-submit {
  width: 100%;
  padding: 11px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  margin-top: 4px;
}

.auth-switch {
  margin-top: 16px;
  font-size: 13px;
  color: var(--c-text-secondary);
  text-align: center;
}

.auth-switch a {
  color: var(--c-primary);
  text-decoration: none;
  font-weight: 500;
}

.auth-switch a:hover {
  text-decoration: underline;
}

/* ═══════════════════════════════════════════════════════════
   欢迎页顶部导航栏
   ═══════════════════════════════════════════════════════════ */
.welcome-topbar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: none; /* 默认隐藏，未登录时 JS 显示 */
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  z-index: 10;
}

.welcome-topbar.show {
  display: flex;
}

.welcome-topbar-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--c-text);
}

.welcome-topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-ghost {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  background: none;
  border: none;
  color: var(--c-text);
  transition: all var(--transition);
}

.btn-ghost:hover {
  background: rgba(99, 102, 241, 0.08);
  color: var(--c-primary);
}

.btn-sm {
  padding: 8px 18px;
  font-size: 14px;
}

.btn-lg {
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.btn-outline {
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  background: transparent;
  color: var(--c-primary);
  border: 1.5px solid var(--c-primary);
  transition: all var(--transition);
}

.btn-outline:hover {
  background: var(--c-primary-bg);
}

/* 欢迎页行动按钮 */
.welcome-auth-actions {
  display: none; /* 默认隐藏，未登录时 JS 显示 */
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
  margin-bottom: 12px;
}

.welcome-auth-actions.show {
  display: flex;
}

/* 根据登录状态切换提示文案 */
.welcome-desc-loggedin {
  display: none;
}
.welcome-desc-guest {
  display: none;
}

/* JS 会给 body 加 .logged-in class */
body.logged-in .welcome-desc-loggedin { display: inline; }
body.logged-in .welcome-desc-guest    { display: none; }
body:not(.logged-in) .welcome-desc-loggedin { display: none; }
body:not(.logged-in) .welcome-desc-guest    { display: inline; }

/* 未登录时欢迎页需要全屏居中（没有侧边栏） */
.welcome-screen {
  position: relative;
}

/* ═══════════════════════════════════════════════════════════
   表单通用样式
   ═══════════════════════════════════════════════════════════ */
.form-group {
  margin-bottom: 16px;
  text-align: left;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--c-text-secondary);
  margin-bottom: 6px;
}

.form-group input[type="text"],
.form-group input[type="password"] {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font-sans);
  color: var(--c-text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  background: var(--c-surface);
}

.form-group input:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* ═══════════════════════════════════════════════════════════
   侧边栏用户栏
   ═══════════════════════════════════════════════════════════ */
.sidebar-user-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--c-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
  text-transform: uppercase;
}

.user-name {
  flex: 1;
  font-size: 13px;
  color: #fff;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-actions {
  display: flex;
  gap: 2px;
}

.icon-btn {
  background: none;
  border: none;
  color: rgba(255,255,255,0.5);
  cursor: pointer;
  padding: 5px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.icon-btn:hover {
  background: rgba(255,255,255,0.1);
  color: #fff;
}

/* ═══════════════════════════════════════════════════════════
   设置对话框
   ═══════════════════════════════════════════════════════════ */
.settings-modal {
  width: min(480px, 90vw);
}

.settings-modal .form-group input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font-sans);
  color: var(--c-text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.settings-modal .form-group input:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.input-with-toggle {
  position: relative;
  display: flex;
  align-items: center;
}

.input-with-toggle input {
  padding-right: 40px !important;
}

.toggle-visibility-btn {
  position: absolute;
  right: 8px;
  background: none;
  border: none;
  color: var(--c-text-secondary);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.toggle-visibility-btn:hover {
  color: var(--c-primary);
}

.settings-hint {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 10px 14px;
  background: #fffbeb;
  border: 1px solid #fde68a;
  border-radius: var(--radius-sm);
  margin-top: 4px;
  margin-bottom: 8px;
}

.settings-hint svg {
  flex-shrink: 0;
  color: #d97706;
  margin-top: 1px;
}

.settings-hint span {
  font-size: 12px;
  color: #92400e;
  line-height: 1.5;
}

/* ═══════════════════════════════════════════════════════════
   Toast 提示
   ═══════════════════════════════════════════════════════════ */
.toast-message {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: #1e1e2e;
  color: #fff;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  z-index: 9999;
  animation: toastIn 0.3s ease, toastOut 0.3s ease 2.7s forwards;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(10px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

@keyframes toastOut {
  from { opacity: 1; }
  to   { opacity: 0; }
}