*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background: #f9fafb;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  padding: 20px;
}

.ai-chat-layout {
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 450px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid #f3f4f6;
}

.chat-header {
  background: #111827;
  color: #ffffff;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.chat-header h3 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
}

.chat-window {
  padding: 20px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 350px;
  max-height: 400px;
  overflow-y: auto;
  background: #f9fafb;
}

.message {
  display: flex;
  flex-direction: column;
  max-width: 85%;
}

.ai-message {
  align-self: flex-start;
}

.user-message {
  align-self: flex-end;
}

.bubble {
  padding: 12px 16px;
  border-radius: 16px;
  line-height: 1.5;
  font-size: 0.95rem;
}

.ai-message .bubble {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  color: #1f2937;
  border-bottom-left-radius: 4px;
}

.user-message .bubble {
  background: #3b82f6;
  color: #ffffff;
  border-bottom-right-radius: 4px;
}

.input-area {
  padding: 16px;
  background: #ffffff;
  border-top: 1px solid #f3f4f6;
  display: flex;
  gap: 12px;
  align-items: center;
}

#ai-input {
  flex-grow: 1;
  border: 1px solid #e5e7eb;
  border-radius: 24px;
  padding: 12px 16px;
  outline: none;
  transition: border-color 0.2s;
  font-family: inherit;
  font-size: 0.95rem;
}

#ai-input:focus {
  border-color: #3b82f6;
}

#ai-send {
  background: #3b82f6;
  color: #ffffff;
  border: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  transition: background 0.2s;
  flex-shrink: 0;
}

#ai-send:hover {
  background: #2563eb;
}

document.getElementById("ai-send").addEventListener("click", sendMessage);

document.getElementById("ai-input").addEventListener("keypress", function(e) {
  if (e.key === "Enter") {
    sendMessage();
  }
});

function sendMessage() {
  const input = document.getElementById("ai-input");
  const text = input.value.trim();
  
  if (!text) return;
  
  const chatWindow = document.getElementById("chat-window");
  
  const userMsg = document.createElement("div");
  userMsg.className = "message user-message";
  userMsg.innerHTML = `<div class="bubble">${text}</div>`;
  chatWindow.appendChild(userMsg);
  
  input.value = "";
  chatWindow.scrollTop = chatWindow.scrollHeight;
  
  setTimeout(() => {
    const aiMsg = document.createElement("div");
    aiMsg.className = "message ai-message";
    aiMsg.innerHTML = `<div class="bubble">I received your message! I am processing it now.</div>`;
    chatWindow.appendChild(aiMsg);
    chatWindow.scrollTop = chatWindow.scrollHeight;
  }, 600);
}