* {
  box-sizing: border-box;
}

body {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 20px;
  display: flex;
  justify-content: center;
  min-height: 100vh;
  align-items: center;
}

.container {
  background: white;
  width: 500px;
  max-width: 95vw;
  padding: 25px;
  border-radius: 25px;
  box-shadow: 0 15px 35px rgba(0,0,0,0.15);
  display: flex;
  flex-direction: column;
  height: 700px;
  position: relative;
  backdrop-filter: blur(10px);
}

.version-badge {
  position: absolute;
  top: 15px;
  right: 15px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
  z-index: 10;
}

h1 {
  text-align: center;
  margin-bottom: 20px;
  color: #333;
  font-size: 1.8rem;
  font-weight: 600;
  margin-top: 10px;
}

.header-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.reset-btn {
  padding: 8px 15px !important;
  font-size: 0.9rem !important;
  min-width: auto !important;
  background: linear-gradient(135deg, #64748b, #475569) !important;
}

.reset-btn:hover {
  background: linear-gradient(135deg, #475569, #334155) !important;
}

.chatbox {
  flex-grow: 1;
  border: 2px solid #e0e6ed;
  padding: 20px;
  overflow-y: auto;
  border-radius: 15px;
  background: #f8fafc;
  margin-bottom: 20px;
  font-size: 1rem;
}

.message {
  margin-bottom: 15px;
  padding: 12px 16px;
  border-radius: 18px;
  max-width: 85%;
  word-wrap: break-word;
  line-height: 1.5;
  font-size: 1rem;
  animation: slideIn 0.3s ease;
}

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

.message strong {
  display: block;
  margin-bottom: 5px;
  font-size: 0.9rem;
  opacity: 0.7;
}

.message.user {
  background: #667eea;
  color: white;
  margin-left: auto;
  border-bottom-right-radius: 5px;
}

.message.bot {
  background: #e2e8f0;
  color: #334155;
  margin-right: auto;
  border-bottom-left-radius: 5px;
  border-left: 4px solid #667eea;
}

form {
  display: flex;
  gap: 12px;
  align-items: center;
}

input[type="text"] {
  flex-grow: 1;
  padding: 15px 20px;
  font-size: 1rem;
  border-radius: 25px;
  border: 2px solid #e2e8f0;
  outline: none;
  transition: border-color 0.2s ease;
  background: #f8fafc;
}

input[type="text"]:focus {
  border-color: #667eea;
  background: white;
}

input[type="text"]::placeholder {
  color: #94a3b8;
}

button {
  padding: 15px 25px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  border: none;
  border-radius: 25px;
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 1rem;
  min-width: 80px;
}

button:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

button:active {
  transform: translateY(0);
}

footer {
  margin-top: 15px;
  text-align: center;
  font-size: 0.9rem;
  color: #64748b;
  font-weight: 500;
}

.chatbox::-webkit-scrollbar {
  width: 6px;
}

.chatbox::-webkit-scrollbar-track {
  background: #f1f5f9;
  border-radius: 3px;
}

.chatbox::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 3px;
}

.chatbox::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

@media (max-width: 600px) {
  .container {
    width: 100%;
    height: 80vh;
    padding: 20px;
    margin: 0;
    border-radius: 0;
  }
  
  .version-badge {
    top: 10px;
    right: 10px;
    font-size: 0.75rem;
    padding: 3px 10px;
  }
  
  h1 {
    font-size: 1.5rem;
  }
  
  .message {
    font-size: 0.95rem;
    max-width: 90%;
  }
}