
    :root {
      --color-bg: #f8f9fa;
      --color-sidebar-bg: #1a1a1a;
      --color-text: #333333;
      --color-text-secondary: #5a5a5a;
      --color-user-bubble: #e9f5ff;
      --color-user-bubble-border: #c9e5ff;
      --color-assistant-bubble: #f0f4f8;
      --color-assistant-bubble-border: #dde4ed;
      --color-header: #2c3e50;
      --color-header-text: #ffffff;
      --color-accent: #3498db;
      --color-accent-hover: #2980b9;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
      --shadow-md: 0 4px 6px rgba(0,0,0,0.08);
      --radius-sm: 0.375rem;
      --radius-md: 0.5rem;
      --radius-lg: 0.75rem;
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.6;
      max-width: 100%;
      overflow-x: hidden;
    }
    
    .container {
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }
    
    header {
      background-color: var(--color-header);
      color: var(--color-header-text);
      padding: 1rem 2rem;
      position: sticky;
      top: 0;
      z-index: 10;
      box-shadow: var(--shadow-sm);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    
    header h1 {
      font-size: 1.25rem;
      font-weight: 600;
      margin: 0;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
    
    .conversation-container {
      padding: 2rem;
      max-width: 900px;
      margin: 0 auto;
      width: 100%;
    }
    
    .message {
      margin-bottom: 1.5rem;
      display: flex;
      flex-direction: column;
      max-width: 100%;
    }
    
    .message-header {
      display: flex;
      align-items: center;
      margin-bottom: 0.5rem;
    }
    
    .message-avatar {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      margin-right: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      color: white;
      font-size: 0.875rem;
      box-shadow: var(--shadow-sm);
    }
    
    .avatar-user {
      background-color: var(--color-accent);
    }
    
    .avatar-assistant {
      background-color: #34495e;
    }
    
    .message-author {
      font-weight: 600;
      font-size: 1rem;
    }
    
    .message-content {
      padding: 1.25rem;
      border-radius: var(--radius-lg);
      line-height: 1.6;
      overflow-wrap: break-word;
      word-wrap: break-word;
      hyphens: auto;
      box-shadow: var(--shadow-sm);
      transition: box-shadow 0.2s ease;
    }
    
    .message-content:hover {
      box-shadow: var(--shadow-md);
    }
    
    .user .message-content {
      background-color: var(--color-user-bubble);
      border: 1px solid var(--color-user-bubble-border);
      align-self: flex-end;
      margin-left: 2rem;
    }
    
    .assistant .message-content {
      background-color: var(--color-assistant-bubble);
      border: 1px solid var(--color-assistant-bubble-border);
      align-self: flex-start;
      margin-right: 2rem;
    }
    
    /* Code styles */
    pre {
      background-color: #282c34;
      color: #abb2bf;
      padding: 1rem;
      border-radius: var(--radius-sm);
      overflow-x: auto;
      margin: 1rem 0;
      font-size: 0.875rem;
      border: 1px solid rgba(0,0,0,0.1);
    }
    
    code {
      font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
      font-size: 0.875rem;
      background-color: rgba(0,0,0,0.05);
      padding: 0.2em 0.4em;
      border-radius: 3px;
    }
    
    pre code {
      background-color: transparent;
      padding: 0;
      border-radius: 0;
    }
    
    /* Markdown content styles */
    .message-content h1,
    .message-content h2,
    .message-content h3,
    .message-content h4,
    .message-content h5,
    .message-content h6 {
      margin: 1.5rem 0 1rem;
      line-height: 1.25;
      color: #2c3e50;
    }
    
    .message-content h1:first-child,
    .message-content h2:first-child,
    .message-content h3:first-child,
    .message-content h4:first-child,
    .message-content h5:first-child,
    .message-content h6:first-child {
      margin-top: 0;
    }
    
    .message-content h1 {
      font-size: 1.75rem;
      border-bottom: 1px solid #eaecef;
      padding-bottom: 0.3em;
    }
    
    .message-content h2 {
      font-size: 1.5rem;
      border-bottom: 1px solid #eaecef;
      padding-bottom: 0.3em;
    }
    
    .message-content h3 {
      font-size: 1.25rem;
    }
    
    .message-content h4 {
      font-size: 1.125rem;
    }
    
    .message-content ul,
    .message-content ol {
      padding-left: 1.5rem;
      margin: 1rem 0;
    }
    
    .message-content li {
      margin-bottom: 0.5rem;
    }
    
    .message-content p {
      margin-bottom: 1rem;
    }
    
    .message-content p:last-child {
      margin-bottom: 0;
    }
    
    .message-content blockquote {
      border-left: 4px solid #dfe2e5;
      padding: 0.75rem 1rem;
      margin: 1rem 0;
      color: #6a737d;
      background-color: #f6f8fa;
      border-radius: var(--radius-sm);
    }
    
    .message-content a {
      color: var(--color-accent);
      text-decoration: none;
      transition: color 0.2s ease;
    }
    
    .message-content a:hover {
      color: var(--color-accent-hover);
      text-decoration: underline;
    }
    
    .message-content table {
      border-collapse: collapse;
      width: 100%;
      margin: 1rem 0;
      overflow-x: auto;
      display: block;
    }
    
    .message-content th,
    .message-content td {
      border: 1px solid #dfe2e5;
      padding: 0.6rem 1rem;
      text-align: left;
    }
    
    .message-content th {
      background-color: #f6f8fa;
      font-weight: 600;
    }
    
    .message-content tr:nth-child(even) {
      background-color: #f8f9fa;
    }
    
    /* Image styles */
    .message img {
      max-width: 100%;
      height: auto;
      border-radius: var(--radius-sm);
      margin: 0.5rem 0;
      border: 1px solid #eaecef;
    }
    
    /* Mobile responsive layout */
    @media (max-width: 768px) {
      .conversation-container {
        padding: 1rem;
      }
      
      header {
        padding: 0.75rem 1rem;
      }
      
      .message-content {
        padding: 1rem;
      }
      
      .user .message-content,
      .assistant .message-content {
        margin-left: 0;
        margin-right: 0;
      }
    }
    
    /* Navigation */
    .back-button {
      background-color: var(--color-accent);
      color: white;
      border: none;
      padding: 0.5rem 1rem;
      border-radius: var(--radius-sm);
      font-weight: 500;
      cursor: pointer;
      transition: background-color 0.2s;
      text-decoration: none;
      display: inline-block;
      box-shadow: var(--shadow-sm);
    }
    
    .back-button:hover {
      background-color: var(--color-accent-hover);
      box-shadow: var(--shadow-md);
    }
    
    /* Code highlighting */
    .hljs-keyword,
    .hljs-operator {
      color: #c678dd;
    }
    
    .hljs-string {
      color: #98c379;
    }
    
    .hljs-number {
      color: #d19a66;
    }
    
    .hljs-comment {
      color: #7f848e;
    }
    
    /* Date display */
    .message-time {
      font-size: 0.75rem;
      color: var(--color-text-secondary);
      margin-left: 0.5rem;
    }
  