/* ===== Spin Animation ===== */
@keyframes spin-icon-rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.spin-icon {
  animation: spin-icon-rotate 0.8s linear infinite;
}

/* ===== Chat Page Layout ===== */
.chat-page {
  display: flex;
  height: 100%;
  overflow: hidden;
}

/* ===== Left Sidebar ===== */
.chat-sidebar {
  width: 280px;
  min-width: 280px;
  background: var(--color-sidebar-bg);
  border-right: 1px solid var(--color-border-light);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-sidebar-header {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--color-border-light);
}

.new-chat-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-accent);
  color: var(--color-text-inverse);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

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

.new-chat-btn:active {
  transform: scale(0.98);
}

/* Search */
.chat-sidebar-search {
  padding: var(--space-md) var(--space-lg);
  position: relative;
}

.search-icon-wrap {
  position: absolute;
  left: calc(var(--space-lg) + var(--space-md));
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  color: var(--color-text-tertiary);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: var(--space-sm) var(--space-md) var(--space-sm) calc(var(--space-2xl) + var(--space-sm));
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input::placeholder {
  color: var(--color-text-disabled);
}

.search-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

/* Conversation List */
.chat-sidebar-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-sm) var(--space-sm);
}

.conversation-item {
  padding: var(--space-md) var(--space-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-fast);
  margin-bottom: 2px;
  position: relative;
}

.conversation-item:hover {
  background: var(--color-sidebar-hover);
}

.conversation-item.active {
  background: var(--color-sidebar-active);
}

.conversation-item.active .conv-title {
  color: var(--color-accent);
  font-weight: 600;
}

.conv-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-xs);
  margin-bottom: 4px;
}

.conv-pin-icon {
  display: flex;
  align-items: center;
  color: var(--color-accent);
  flex-shrink: 0;
  transform: rotate(45deg);
}

.conversation-item.pinned {
  background: var(--color-accent-subtle);
  border-left: 3px solid var(--color-accent);
}

.conversation-item.pinned:hover {
  background: var(--color-accent-light);
}

.conversation-item.pinned.active {
  background: var(--color-sidebar-active);
  border-left-color: var(--color-accent);
}

.conv-title {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-primary);
  flex: 1;
  min-width: 0;
  line-height: 1.4;
}

.conv-more-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  color: var(--color-text-tertiary);
  cursor: pointer;
  opacity: 0.5;
  transition: opacity var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
  flex-shrink: 0;
}

.conversation-item:hover .conv-more-btn {
  opacity: 1;
  color: var(--color-text-secondary);
}

.conv-more-btn:hover {
  background: var(--color-bg-tertiary);
  color: var(--color-accent);
}

.conv-preview {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  line-height: 1.4;
  margin-bottom: 4px;
}

.conv-meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.conv-time {
  font-size: 11px;
  color: var(--color-text-disabled);
}

.conv-badge {
  font-size: 10px;
  color: var(--color-warning);
  background: var(--color-warning-light);
  padding: 1px 6px;
  border-radius: var(--radius-full);
  font-weight: 500;
}

.conv-empty {
  padding: var(--space-2xl) var(--space-lg);
  text-align: center;
  color: var(--color-text-tertiary);
  font-size: var(--text-sm);
}

/* ===== Right Main Area ===== */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--color-bg-primary);
  overflow: hidden;
}

/* Chat Header */
.chat-header {
  height: 52px;
  min-height: 52px;
  padding: 0 var(--space-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border-light);
}

.chat-header-left {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  min-width: 0;
}

.model-selector {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  transition: background var(--transition-fast);
  white-space: nowrap;
  flex-shrink: 0;
}

.model-selector:hover {
  background: var(--color-bg-hover);
}

.model-name {
  font-weight: 500;
  color: var(--color-text-primary);
}

.model-badge {
  font-size: 10px;
  color: var(--color-accent);
  background: var(--color-accent-light);
  padding: 1px 6px;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.chat-header-divider {
  width: 1px;
  height: 20px;
  background: var(--color-border);
  flex-shrink: 0;
}

.chat-title {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-primary);
  min-width: 0;
}

/* Messages Area */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.chat-empty-state,
.chat-empty-full {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--color-text-tertiary);
  gap: var(--space-md);
  user-select: none;
}

.empty-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text-secondary);
}

.empty-desc {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

/* Message Row */
.message-row {
  display: flex;
  flex-direction: column;
  max-width: 75%;
  animation: fadeIn var(--transition-normal);
}

.message-row.user {
  align-self: flex-end;
  align-items: flex-end;
}

.message-row.assistant {
  align-self: flex-start;
  align-items: flex-start;
}

/* Message Bubble */
.message-bubble {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  line-height: 1.7;
  word-break: break-word;
}

.message-bubble.user {
  background: var(--color-accent);
  color: var(--color-text-inverse);
  border-bottom-right-radius: var(--radius-sm);
}

.message-bubble.assistant {
  background: var(--color-bg-secondary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-light);
  border-bottom-left-radius: var(--radius-sm);
  box-shadow: var(--shadow-xs);
}

/* Message Meta */
.message-meta {
  display: flex;
  gap: var(--space-sm);
  padding: 4px var(--space-sm) 0;
  font-size: 11px;
  color: var(--color-text-disabled);
}

.message-meta.user {
  justify-content: flex-end;
}

/* Markdown Rendering */
.markdown-body {
  display: block;
  line-height: 1.7;
}

.md-p { margin: 0 0 8px; }
.md-p:last-child { margin-bottom: 0; }
.md-blockquote {
  border-left: 3px solid #6C63FF;
  padding: 4px 12px;
  margin: 8px 0;
  background: rgba(0,0,0,0.04);
  border-radius: 0 4px 4px 0;
  color: #5A6480;
}
.md-link {
  color: #6C63FF;
  text-decoration: underline;
}
.md-table {
  border-collapse: collapse;
  width: 100%;
  margin: 8px 0;
  font-size: 13px;
}
.md-td {
  border: 1px solid rgba(0,0,0,0.1);
  padding: 6px 10px;
  text-align: left;
}
.md-tr:first-child .md-td {
  font-weight: 600;
  background: rgba(0,0,0,0.03);
}
.md-ul {
  margin: 4px 0 8px;
  padding-left: 1.5em;
}
.md-ul .md-li {
  margin: 2px 0;
  list-style: disc;
}

.message-bubble.user .markdown-body {
  gap: 4px;
}

.md-code-block {
  background: rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.5;
  margin: 4px 0;
}

.message-bubble.user .md-code-block {
  background: rgba(255, 255, 255, 0.15);
}

.md-inline-code {
  background: rgba(0, 0, 0, 0.07);
  padding: 1px 5px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.message-bubble.user .md-inline-code {
  background: rgba(255, 255, 255, 0.15);
}

.md-h2 {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-top: 8px;
  color: inherit;
}

.md-h3 {
  font-size: var(--text-md);
  font-weight: 600;
  margin-top: 6px;
  color: inherit;
}

.md-h4 {
  font-size: var(--text-base);
  font-weight: 600;
  color: inherit;
}

.md-li {
  margin-left: 1.2em;
  line-height: 1.6;
}

.md-hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 8px 0;
}

.message-bubble.user .md-hr {
  border-color: rgba(255, 255, 255, 0.2);
}

.message-bubble.user .md-code-block {
  background: rgba(0, 0, 0, 0.2);
}

/* ===== Input Area ===== */
.chat-input-area {
  padding: var(--space-md) var(--space-xl) var(--space-xl);
  background: var(--color-bg-primary);
  overflow: visible;
}

.chat-input-container {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.chat-input-container:focus-within {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.input-attachments {
  display: flex;
  gap: 4px;
  padding: 0 var(--space-sm) 4px;
}

.attach-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-weight: 500;
}

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

.input-row {
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
  padding: 0 var(--space-sm);
}

.chat-textarea {
  flex: 1;
  border: none;
  outline: none;
  resize: none;
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background: transparent;
  padding: var(--space-xs) 0;
  max-height: 160px;
  font-family: var(--font-sans);
}

.chat-textarea::placeholder {
  color: var(--color-text-disabled);
}

.send-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-md);
  background: var(--color-accent);
  color: var(--color-text-inverse);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
  margin-bottom: 2px;
}

.send-btn:hover:not(:disabled) {
  background: var(--color-accent-hover);
  transform: scale(1.05);
}

.send-btn:active:not(:disabled) {
  transform: scale(0.95);
}

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

/* ===== Dropdown ===== */
.dropdown-wrapper {
  position: relative;
  display: inline-flex;
}

.dropdown-trigger {
  cursor: pointer;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  z-index: 9999;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-xs);
  min-width: 180px;
  max-height: 320px;
  overflow-y: auto;
  animation: fadeIn var(--transition-fast);
}

/* Upward-opening dropdown for bottom-of-page elements */
.dropdown-menu.dropup {
  top: auto;
  bottom: calc(100% + 4px);
}

.dropdown-menu.align-left {
  left: 0;
}

.dropdown-menu.align-right {
  right: 0;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  background: none;
  border: none;
  cursor: pointer;
  transition: background var(--transition-fast);
  text-align: left;
  white-space: nowrap;
}

.dropdown-item:hover {
  background: var(--color-bg-hover);
  color: var(--color-text-primary);
}

.dropdown-item.selected {
  color: var(--color-accent);
  background: var(--color-accent-subtle);
  font-weight: 500;
}

/* 模型能力徽标（图像/视频） */
.model-cap-badge {
  margin-left: auto;
  flex-shrink: 0;
  font-size: 11px;
  line-height: 1;
  padding: 3px 7px;
  border-radius: 999px;
  background: linear-gradient(135deg, #6C63FF 0%, #8B7CFF 100%);
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.dropdown-item.danger {
  color: var(--color-error);
}

.dropdown-item.danger:hover {
  background: var(--color-error-light);
}

.dropdown-item.disabled {
  color: var(--color-text-disabled);
  cursor: default;
  pointer-events: none;
}

.dropdown-divider {
  height: 1px;
  background: var(--color-border-light);
  margin: var(--space-xs) 0;
}

.model-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
}

.model-provider-tag {
  font-size: 10px;
  color: var(--color-text-tertiary);
  margin-left: auto;
  background: var(--color-bg-tertiary);
  padding: 1px 6px;
  border-radius: var(--radius-full);
}

.attach-dropdown-title {
  padding: var(--space-xs) var(--space-md) var(--space-sm);
  font-size: 11px;
  font-weight: 600;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.attach-count {
  margin-left: auto;
  font-size: 11px;
  color: var(--color-text-disabled);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .chat-sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    z-index: var(--z-overlay);
    transform: translateX(-100%);
    transition: transform var(--transition-slow);
    box-shadow: var(--shadow-lg);
  }

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

  .chat-header {
    padding: 0 var(--space-md);
  }

  .chat-messages {
    padding: var(--space-md);
  }

  .chat-input-area {
    padding: var(--space-sm) var(--space-md) var(--space-md);
  }
}

/* ===== Knowledge Graph Conversion Modal ===== */
.kg-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-overlay);
  animation: fadeIn 0.2s ease;
}

.kg-modal {
  background: var(--color-card-bg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 420px;
  max-width: 90vw;
  overflow: hidden;
}

.kg-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-xl) var(--space-2xl);
  border-bottom: 1px solid var(--color-border-light);
}

.kg-modal-header h3 {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-primary);
}

.kg-modal-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  border: none;
  background: transparent;
  color: var(--color-text-tertiary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.kg-modal-close:hover {
  background: var(--color-bg-hover);
  color: var(--color-text-primary);
}

.kg-modal-body {
  padding: var(--space-2xl);
}

/* Progress State */
.kg-progress-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xl);
}

.kg-steps {
  display: flex;
  align-items: center;
  gap: 0;
  width: 100%;
}

.kg-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.kg-step-indicator {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-tertiary);
  background: var(--color-card-bg);
  transition: all var(--transition-normal);
}

.kg-step.active .kg-step-indicator {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: var(--color-accent-light);
}

.kg-step.done .kg-step-indicator {
  border-color: var(--color-success);
  color: var(--color-success);
  background: var(--color-success-light, rgba(34, 197, 94, 0.1));
}

.kg-step-label {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  white-space: nowrap;
}

.kg-step.active .kg-step-label {
  color: var(--color-accent);
  font-weight: 600;
}

.kg-step.done .kg-step-label {
  color: var(--color-success);
}

.kg-step-connector {
  flex: 1;
  padding-bottom: 20px;
}

.kg-connector-line {
  height: 2px;
  background: var(--color-border);
  border-radius: 1px;
  position: relative;
  overflow: hidden;
}

.kg-connector-line.done {
  background: var(--color-success);
}

.kg-connector-progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 70%;
  background: var(--color-accent);
  border-radius: 1px;
  animation: kgProgressPulse 1s ease-in-out infinite;
}

@keyframes kgProgressPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.kg-progress-tip {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* Spinner */
.kg-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top-color: var(--color-accent);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

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

/* Success State */
.kg-success-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.kg-success-icon {
  margin-bottom: var(--space-sm);
}

.kg-success-title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text-primary);
}

.kg-result-stats {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  padding: var(--space-lg) var(--space-2xl);
  background: var(--color-bg-subtle);
  border-radius: var(--radius-lg);
}

.kg-stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.kg-stat-value {
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-accent);
}

.kg-stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.kg-stat-divider {
  width: 1px;
  height: 32px;
  background: var(--color-border);
}

.kg-result-kb {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.kg-actions {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-sm);
}

/* Error State */
.kg-error-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.kg-error-icon {
  margin-bottom: var(--space-xs);
}

.kg-error-text {
  font-size: var(--text-sm);
  color: var(--color-error);
  text-align: center;
}

/* Buttons */
.kg-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-xl);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.kg-btn-primary {
  background: var(--color-accent);
  color: var(--color-text-inverse);
}

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

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

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

/* ===== Evolution Skill Tags (below assistant messages) ===== */
.evo-skill-tags-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-xs);
  padding-left: 4px;
}

.evo-skill-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  font-family: var(--font-mono);
}

.evo-skill-tag:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent);
  transform: translateY(-1px);
}

.evo-skill-tag-more {
  background: var(--color-bg-tertiary);
  color: var(--color-text-tertiary);
  cursor: default;
  font-family: var(--font-sans);
}

.evo-skill-tag-more:hover {
  background: var(--color-bg-tertiary);
  border-color: transparent;
  transform: none;
}

/* AI 聊天中生成的图像 / 视频 */
.md-img {
  display: block;
  max-width: 100%;
  max-height: 420px;
  width: auto;
  height: auto;
  border-radius: var(--radius-md);
  margin: var(--space-sm) 0;
  box-shadow: var(--shadow-md);
  background: #fff;
  object-fit: contain;
}

.md-video {
  display: block;
  max-width: 100%;
  width: 100%;
  max-height: 460px;
  border-radius: var(--radius-md);
  margin: var(--space-sm) 0;
  box-shadow: var(--shadow-md);
  background: #000;
}