/* ===== 聊天区 ===== */
#chatHeader {
  height: var(--header-height);
  border-bottom: 1px solid var(--color-border);
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  background: var(--color-bg-primary);
  flex-shrink: 0;
}
#mobileMenuToggle {
  display: none;
}
#characterInfo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex: 1;
}
#characterInfo img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  object-fit: cover;
  background: var(--color-border);
}
#characterInfo h2 {
  font-size: var(--font-size-base);
  font-weight: 600;
}
#characterInfo p {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}
.header-actions {
  display: flex;
  gap: var(--spacing-xs);
}

#chatMessages {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  background: var(--color-bg-secondary);
}
.message {
  display: flex;
  gap: var(--spacing-md);
  max-width: 80%;
  animation: fadeIn 0.3s ease;
}
.message.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}
.message.assistant {
  align-self: flex-start;
}
.message .avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  background: var(--color-border);
  object-fit: cover;
}
.message .bubble {
  background: var(--color-bg-primary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  word-wrap: break-word;
  max-width: 100%;
  position: relative;
}
.message.user .bubble {
  background: var(--color-accent);
  color: #fff;
  border-bottom-right-radius: 0;
}
.message.assistant .bubble {
  border-bottom-left-radius: 0;
}
.message .bubble p {
  margin-bottom: var(--spacing-xs);
}
.message .bubble p:last-child {
  margin-bottom: 0;
}
.message .timestamp {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
  text-align: right;
}
.message.user .timestamp {
  color: rgba(255,255,255,0.7);
}

#chatInput {
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-md);
  background: var(--color-bg-primary);
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-end;
  flex-shrink: 0;
}
#messageInput {
  flex: 1;
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  min-height: 44px;
  max-height: 120px;
  background: var(--color-bg-secondary);
  border: 1px solid transparent;
  transition: border-color var(--transition-fast);
}
#messageInput:focus {
  border-color: var(--color-accent);
  background: var(--color-bg-input);
}
.send-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--color-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
  flex-shrink: 0;
}
.send-btn:hover {
  background: var(--color-accent-hover);
}
.send-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.send-btn i {
  font-size: 1.2rem;
}
/* ===== 角色表单 ===== */
.character-form .form-group textarea {
  min-height: 80px;
}
.character-form .form-group textarea.system-prompt {
  min-height: 150px;
  font-family: monospace;
}
.avatar-upload {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}
.avatar-preview {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-full);
  object-fit: cover;
  background: var(--color-border);
  border: 2px dashed var(--color-border);
}
.bg-preview {
  max-width: 100%;
  max-height: 150px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  object-fit: cover;
  background: var(--color-bg-secondary);
}
.avatar-upload input[type="file"] {
  flex: 1;
  min-width: 150px;
}