body {
   font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
   max-width: 900px;
   margin: 0 auto;
   padding: 20px;
   background: #f5f5f5;
}

#chatContainer {
   display: flex;
   flex-direction: column;
   height: 95vh;
   background: white;
   border-radius: 10px;
   box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
   overflow: hidden;
}

#header {
   background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
   color: white;
   padding: 15px 20px;
   font-size: 1.2em;
   display: flex;
   justify-content: space-between;
   align-items: center;
}

#chatLog {
   flex: 1;
   overflow-y: auto;
   padding: 20px;
   background: #fafafa;
}

.message {
   margin-bottom: 25px;
   animation: fadeIn 0.3s ease-in;
}

.message-user {
   background: #e3f2fd;
   border-left: 4px solid #2196f3;
   padding: 12px 15px;
   border-radius: 0 8px 8px 0;
   margin-left: 0;
   margin-right: 40px;
}

.message-assistant {
   background: white;
   border: 1px solid #e0e0e0;
   border-radius: 8px;
   padding: 15px;
   margin-right: 0;
   margin-left: 40px;
   box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.message-header {
   display: flex;
   align-items: center;
   margin-bottom: 12px;
   font-weight: 600;
}

.message-header.user {
   color: #1976d2;
}

.message-header.assistant {
   color: #388e3c;
}

.avatar {
   width: 28px;
   height: 28px;
   border-radius: 50%;
   margin-right: 10px;
   display: flex;
   align-items: center;
   justify-content: center;
   font-size: 14px;
}

.user-avatar {
   background: #2196f3;
   color: white;
}

.assistant-avatar {
   background: #4caf50;
   color: white;
}

#inputArea {
   border-top: 1px solid #e0e0e0;
   padding: 15px;
   background: white;
   display: flex;
   flex-direction: column;
   gap: 10px;
}

#userInput {
   width: 100%;
   padding: 16px 18px;
   border: 2px solid #ddd;
   border-radius: 10px;
   font-size: 16px;
   resize: none;
   min-height: 100px;
   max-height: 300px;
   font-family: inherit;
   line-height: 1.6;
   box-sizing: border-box;
}

#userInput:focus {
   outline: none;
   border-color: #667eea;
   box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.1);
}

#sendBtn {
   background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
   color: white;
   border: none;
   border-radius: 8px;
   padding: 12px 24px;
   font-weight: 600;
   cursor: pointer;
   transition: transform 0.2s, opacity 0.2s;
   height: 48px;
}

#sendBtn:hover:not(:disabled) {
   transform: translateY(-1px);
   opacity: 0.95;
}

#sendBtn:disabled {
   background: #ccc;
   cursor: not-allowed;
}

.typing-indicator {
   display: flex;
   align-items: center;
   gap: 4px;
   padding: 10px 15px;
   color: #666;
}

.typing-dot {
   width: 8px;
   height: 8px;
   background: #4caf50;
   border-radius: 50%;
   animation: typing 1.4s infinite;
}

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

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

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

@keyframes typing {
   0%, 60%, 100% {
      transform: translateY(0);
   }
   30% {
      transform: translateY(-6px);
   }
}

.streaming-cursor {
   display: inline-block;
   width: 8px;
   height: 20px;
   background-color: #4caf50;
   margin-left: 2px;
   animation: blink 1s infinite;
   vertical-align: middle;
}

@keyframes blink {
   0%, 50% {
      opacity: 1;
   }
   51%, 100% {
      opacity: 0;
   }
}

.thinking-block {
   margin: 10px 0;
   border-left: 3px solid #ff9800;
   background: #fff3e0;
   border-radius: 6px;
   overflow: hidden;
}

.thinking-header {
   padding: 8px 12px;
   background: #ffe0b2;
   cursor: pointer;
   user-select: none;
   display: flex;
   align-items: center;
   gap: 8px;
   font-weight: 600;
   color: #e65100;
   font-size: 0.9em;
}

.thinking-header:hover {
   background: #ffcc80;
}

.thinking-toggle {
   transition: transform 0.2s;
   display: inline-block;
}

.thinking-toggle.collapsed {
   transform: rotate(-90deg);
}

.thinking-content {
   padding: 12px;
   color: #5d4037;
   font-size: 0.9em;
   line-height: 1.5;
   border-top: 1px solid #ffcc80;
}

.thinking-content.hidden {
   display: none;
}

.controls {
   display: flex;
   gap: 10px;
   margin-top: 10px;
   align-items: center;
}

.control-btn {
   padding: 6px 12px;
   background: #f5f5f5;
   border: 1px solid #ddd;
   border-radius: 4px;
   cursor: pointer;
   font-size: 12px;
}

.control-btn:hover {
   background: #e9e9e9;
}

#modelInfo {
   font-size: 12px;
   color: #666;
   margin-left: auto;
}

.markdown-content {
   color: #24292f;
   font-size: 15px;
   line-height: 1.6;
}

.markdown-content h1, .markdown-content h2, .markdown-content h3 {
   color: #1a1a1a;
   border-bottom: 1px solid #eaecef;
   padding-bottom: 0.3em;
   margin-top: 1.5em;
   margin-bottom: 0.8em;
}

.markdown-content h1 {
   font-size: 1.8em;
}

.markdown-content h2 {
   font-size: 1.5em;
}

.markdown-content h3 {
   font-size: 1.25em;
}

.markdown-content p {
   margin: 0.8em 0;
   color: #2d3339;
}

.markdown-content code {
   background-color: #f6f8fa;
   color: #d63384;
   padding: 0.2em 0.4em;
   border-radius: 3px;
   font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
   font-size: 0.9em;
   user-select: text;
}

.markdown-content pre {
   background-color: #0d1117;
   color: #c9d1d9;
   padding: 1em;
   border-radius: 6px;
   overflow-x: auto;
   margin: 1em 0;
   border: 1px solid #30363d;
   user-select: text;
}

.markdown-content pre code {
   background-color: transparent;
   color: inherit;
   padding: 0;
}

.markdown-content ul, .markdown-content ol {
   padding-left: 1.8em;
   margin: 0.8em 0;
   color: #2d3339;
}

.markdown-content li {
   margin: 0.3em 0;
}

.markdown-content blockquote {
   border-left: 3px solid #d0d7de;
   padding-left: 1em;
   margin: 1em 0;
   color: #57606a;
}

.markdown-content table {
   border-collapse: collapse;
   margin: 1em 0;
   width: 100%;
}

.markdown-content th, .markdown-content td {
   border: 1px solid #d0d7de;
   padding: 0.5em 1em;
   text-align: left;
}

.markdown-content th {
   background-color: #f6f8fa;
   font-weight: 600;
}

.markdown-content tr:nth-child(even) {
   background-color: #f6f8fa;
}