:root {
      --primary-bg: #111827;
      --secondary-bg: #1f2937;
      --accent-color: #4f46e5;
      --text-color: #f3f4f6;
      --bot-color: #10b981;
    }
    body {
      background-color: var(--primary-bg);
      color: var(--text-color);
      font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
      line-height: 1.6;
      margin: 0;
      padding: 0;
      height: 100vh;
      display: flex;
      flex-direction: column;
    }
    .chat-container {
      flex: 1;
      overflow-y: auto;
      -webkit-overflow-scrolling: touch;
      scroll-behavior: smooth;
      display: flex;
      flex-direction: column;
      gap: 12px;
      padding: 16px;
      padding-top: 72px;
      padding-bottom: 84px;
    }
    .message-container {
      display: flex;
      flex-direction: column;
      width: 100%;
    }
    .bot-bubble, .user-bubble {
      border-radius: 1.25rem;
      padding: 12px 16px;
      max-width: 85%;
      line-height: 1.5;
      font-size: 1rem;
      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
      word-break: break-word;
      position: relative;
      animation: fadeIn 0.3s ease-out;
    }
    .bot-bubble {
      background-color: var(--secondary-bg);
      align-self: flex-start;
      border-bottom-left-radius: 0.25rem;
    }
    .user-bubble {
      background-color: var(--accent-color);
      align-self: flex-end;
      border-bottom-right-radius: 0.25rem;
    }
    .input-container {
      position: relative;
      flex-grow: 1;
    }
    .clear-btn {
      position: absolute;
      right: 12px;
      top: 50%;
      transform: translateY(-50%);
      background: none;
      border: none;
      color: #9CA3AF;
      cursor: pointer;
      display: none;
    }
    .input-form {
      background-color: rgba(31, 41, 55, 0.95);
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      padding: 12px;
      border-top: 1px solid #374151;
      z-index: 10;
    }
    .link-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 8px;
    }
    .link-btn {
      background-color: #4f46e5;
      color: white;
      padding: 8px 12px;
      border-radius: 8px;
      font-size: 14px;
      display: flex;
      align-items: center;
      text-decoration: none;
      transition: background-color 0.2s;
    }
    .link-btn:hover {
      background-color: #4338ca;
    }
    .timestamp {
      font-size: 12px;
      color: #9CA3AF;
      margin-top: 4px;
      margin-left: 8px;
      align-self: flex-start;
    }
    .user-timestamp {
      align-self: flex-end;
      margin-right: 8px;
    }
    .loading-dots {
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .loading-dots span {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background-color: #4f46e5;
      display: inline-block;
      animation: bounce 1.4s infinite ease-in-out both;
    }
    .loading-dots span:nth-child(1) {
      animation-delay: -0.32s;
    }
    .loading-dots span:nth-child(2) {
      animation-delay: -0.16s;
    }
    @keyframes bounce {
      0%, 80%, 100% { 
        transform: scale(0);
      } 40% { 
        transform: scale(1.0);
      }
    }
    @keyframes fadeIn {
      from {
        opacity: 0;
        transform: translateY(10px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
    @media (max-width: 640px) {
      .chat-container {
        padding-left: 12px;
        padding-right: 12px;
      }
      .bot-bubble, .user-bubble {
        max-width: 90%;
        font-size: 15px;
        padding: 10px 14px;
      }
    }
    @media (orientation: landscape) and (max-height: 500px) {
      .chat-container {
        padding-top: 64px;
        padding-bottom: 64px;
      }
    }