:root {
  --primary-color: #8e24aa;
  --primary-light: #c158dc;
  --primary-dark: #5c007a;
  --secondary-color: #f3f4f6;
  --text-color: #1f2937;
  --text-light: #6b7280;
  --bg-color: #f9fafb;
  --white: #ffffff;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
  --max-width: 1000px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'PingFang SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-container {
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background-color: var(--white);
  border-radius: var(--radius) var(--radius) 0 0;
  box-shadow: var(--shadow);
  z-index: 10;
}

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

/* 模型选择器 */
.model-selector {
  margin: 0 10px;
}

#model-selector {
  padding: 5px 10px;
  border-radius: 5px;
  border: 1px solid #ccc;
  background-color: #fff;
  font-size: 14px;
  cursor: pointer;
}

.dark-theme #model-selector {
  background-color: #2a2a2a;
  color: #fff;
  border-color: #444;
}

.chat-title h1 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-color);
}

.chat-title .logo {
  width: 32px;
  height: 32px;
  background-color: var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
}

.chat-actions {
  display: flex;
  gap: 12px;
}

.action-button {
  background: none;
  border: none;
  color: var(--text-light);
  cursor: pointer;
  font-size: 1.25rem;
  padding: 4px;
  border-radius: 50%;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.action-button:hover {
  background-color: var(--secondary-color);
  color: var(--primary-color);
}

.chat-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 120px);
  background-color: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  flex: 1;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  scroll-behavior: smooth;
  background-image: 
    radial-gradient(circle at 25px 25px, rgba(142, 36, 170, 0.05) 2%, transparent 0%), 
    radial-gradient(circle at 75px 75px, rgba(142, 36, 170, 0.05) 2%, transparent 0%);
  background-size: 100px 100px;
}

.message {
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  max-width: 85%;
}

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

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

.message-bubble {
  position: relative;
  padding: 12px 16px;
  border-radius: 18px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
  margin-top: 4px;
}

.message-info {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-light);
}

.avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: var(--white);
}

.user .avatar {
  background-color: var(--primary-dark);
}

.assistant .avatar {
  background-color: var(--primary-color);
}

.user .message-bubble {
  background-color: var(--primary-color);
  color: var(--white);
  border-bottom-right-radius: 4px;
}

.assistant .message-bubble {
  background-color: var(--secondary-color);
  color: var(--text-color);
  border-bottom-left-radius: 4px;
}

.chat-input-container {
  padding: 16px 24px;
  background-color: var(--white);
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  border-radius: 0 0 var(--radius) var(--radius);
}

.chat-input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  background-color: var(--secondary-color);
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  transition: var(--transition);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.chat-input-wrapper:focus-within {
  box-shadow: 0 0 0 2px var(--primary-light);
}

.chat-input {
  flex: 1;
  border: none;
  background: none;
  padding: 8px 0;
  max-height: 150px;
  min-height: 24px;
  resize: none;
  outline: none;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text-color);
}

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

.input-button {
  background: none;
  border: none;
  color: var(--text-light);
  cursor: pointer;
  font-size: 1.25rem;
  padding: 4px;
  border-radius: 50%;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.input-button:hover {
  color: var(--primary-color);
}

.send-button {
  background-color: var(--primary-color);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}

.send-button:hover {
  background-color: var(--primary-dark);
}

.send-button:disabled {
  background-color: var(--text-light);
  cursor: not-allowed;
}

.typing-indicator {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 12px 16px;
  background-color: var(--secondary-color);
  border-radius: 18px;
  border-bottom-left-radius: 4px;
  width: fit-content;
  margin-top: 4px;
}

.typing-indicator span {
  height: 8px;
  width: 8px;
  background-color: var(--primary-color);
  border-radius: 50%;
  display: inline-block;
  opacity: 0.4;
  animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typing {
  0% { opacity: 0.4; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.2); }
  100% { opacity: 0.4; transform: scale(1); }
}

.message-bubble pre {
  background-color: rgba(0, 0, 0, 0.05);
  padding: 12px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 10px 0;
  font-family: 'Fira Code', 'Courier New', monospace;
  font-size: 0.9rem;
}

.user .message-bubble pre {
  background-color: rgba(255, 255, 255, 0.1);
}

.message-bubble code {
  font-family: 'Fira Code', 'Courier New', monospace;
  padding: 2px 4px;
  background-color: rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.user .message-bubble code {
  background-color: rgba(255, 255, 255, 0.1);
}

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

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

.message-bubble ul, .message-bubble ol {
  margin-left: 24px;
  margin-bottom: 8px;
}

.footer {
  text-align: center;
  padding: 16px;
  color: var(--text-light);
  font-size: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer a {
  color: var(--primary-color);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .app-container {
    padding: 12px;
  }
  
  .chat-container {
    height: calc(100vh - 100px);
  }
  
  .message {
    max-width: 90%;
  }
  
  .chat-title h1 {
    font-size: 1.1rem;
  }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
  :root {
    --primary-color: #c158dc;
    --primary-light: #f186ff;
    --primary-dark: #8e24aa;
    --secondary-color: #374151;
    --text-color: #f3f4f6;
    --text-light: #9ca3af;
    --bg-color: #1f2937;
    --white: #111827;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -1px rgba(0, 0, 0, 0.1);
  }
  
  .chat-messages {
    background-image: 
      radial-gradient(circle at 25px 25px, rgba(193, 88, 220, 0.1) 2%, transparent 0%), 
      radial-gradient(circle at 75px 75px, rgba(193, 88, 220, 0.1) 2%, transparent 0%);
  }
  
  .assistant .message-bubble {
    background-color: var(--secondary-color);
  }
  
  .message-bubble pre {
    background-color: rgba(0, 0, 0, 0.2);
  }
  
  .user .message-bubble pre {
    background-color: rgba(255, 255, 255, 0.1);
  }
  
  .message-bubble code {
    background-color: rgba(0, 0, 0, 0.2);
  }
}

/* 添加暗色主题类样式 */
body.dark-theme {
  --primary-color: #c158dc;
  --primary-light: #f186ff;
  --primary-dark: #8e24aa;
  --secondary-color: #374151;
  --text-color: #f3f4f6;
  --text-light: #9ca3af;
  --bg-color: #1f2937;
  --white: #111827;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -1px rgba(0, 0, 0, 0.1);
}

body.dark-theme .chat-messages {
  background-image: 
    radial-gradient(circle at 25px 25px, rgba(193, 88, 220, 0.1) 2%, transparent 0%), 
    radial-gradient(circle at 75px 75px, rgba(193, 88, 220, 0.1) 2%, transparent 0%);
}

body.dark-theme .assistant .message-bubble {
  background-color: var(--secondary-color);
}

body.dark-theme .message-bubble pre {
  background-color: rgba(0, 0, 0, 0.2);
}

body.dark-theme .user .message-bubble pre {
  background-color: rgba(255, 255, 255, 0.1);
}

body.dark-theme .message-bubble code {
  background-color: rgba(0, 0, 0, 0.2);
}