:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --text-color: #333;
    --bg-color: #f8f9fa;
    --card-color: #fff;
    --user-msg-bg: #e3f2fd;
    --bot-msg-bg: #f1f1f1;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  }
  
  [data-theme="dark"] {
    --primary-color: #4cc9f0;
    --secondary-color: #4895ef;
    --text-color: #f8f9fa;
    --bg-color: #121212;
    --card-color: #1e1e1e;
    --user-msg-bg: #2a3a4a;
    --bot-msg-bg: #2d2d2d;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s, color 0.3s;
  }
  
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
  }
  
  .theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--primary-color);
    z-index: 100;
  }
  
  .card {
    width: 100%;
    max-width: 500px;
    background-color: var(--card-color);
    border-radius: 15px;
    box-shadow: var(--shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    height: 80vh;
  }
  
  #header {
    display: flex;
    align-items: center;
    padding: 15px;
    background-color: var(--primary-color);
    color: white;
  }
  
  .bot-avatar {
    width: 40px;
    height: 40px;
    background-color: var(--secondary-color);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-right: 15px;
    font-size: 1.2rem;
  }
  
  #header h1 {
    font-size: 1.2rem;
    margin-bottom: 2px;
  }
  
  .status {
    font-size: 0.8rem;
    opacity: 0.8;
  }
  
  #message-section {
    flex: 1;
    padding: 15px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  
  .message {
    max-width: 80%;
    padding: 10px 15px;
    border-radius: 18px;
    line-height: 1.4;
    position: relative;
  }
  
  #user {
    align-self: flex-end;
    background-color: var(--user-msg-bg);
    border-bottom-right-radius: 5px;
  }
  
  #bot {
    align-self: flex-start;
    background-color: var(--bot-msg-bg);
    border-bottom-left-radius: 5px;
  }
  
  .typing-indicator {
    display: none;
    padding: 10px 15px;
    align-self: flex-start;
  }
  
  .typing-indicator span {
    display: inline-block;
    width: 8px;
    height: 8px;
    background-color: var(--text-color);
    border-radius: 50%;
    margin: 0 2px;
    opacity: 0.4;
    animation: typing 1s infinite;
  }
  
  .typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
  }
  
  .typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
  }
  
  @keyframes typing {
    0%, 100% { opacity: 0.4; }
    50% { opacity: 1; }
  }
  
  #input-section {
    display: flex;
    padding: 10px;
    background-color: var(--card-color);
    border-top: 1px solid rgba(0, 0, 0, 0.1);
  }
  
  #input {
    flex: 1;
    padding: 10px 15px;
    border: none;
    border-radius: 20px;
    background-color: var(--bot-msg-bg);
    color: var(--text-color);
    outline: none;
  }
  
  .emoji-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    margin-right: 10px;
    color: var(--primary-color);
  }
  
  .send-btn {
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    margin-left: 10px;
    cursor: pointer;
    border: none;
  }
  
  .send-btn:hover {
    background-color: var(--secondary-color);
  }
  
  .timestamp {
    font-size: 0.7rem;
    opacity: 0.6;
    margin-top: 5px;
    text-align: right;
  }
  
  /* Scrollbar styling */
  #message-section::-webkit-scrollbar {
    width: 6px;
  }
  
  #message-section::-webkit-scrollbar-track {
    background: transparent;
  }
  
  #message-section::-webkit-scrollbar-thumb {
    background-color: var(--primary-color);
    border-radius: 3px;
  }