*, *::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";
  margin: 0;
  background: #0f172a;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.ai-stream-container {
  background: #1e293b;
  border: 1px solid #334155;
  border-radius: 16px;
  width: 100%;
  max-width: 600px;
  padding: 30px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.ai-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  color: #f8fafc;
  font-weight: 600;
  font-size: 1.1rem;
}

.ai-avatar {
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 4px 10px rgba(59, 130, 246, 0.4);
}

.ai-response {
  background: rgba(15, 23, 42, 0.5);
  border-radius: 12px;
  padding: 24px;
  min-height: 120px;
}

.stream-output {
  color: #cbd5e1;
  font-size: 1.1rem;
  line-height: 1.7;
}

/* The glowing cursor automatically sits at the end of the injected text */
.stream-output::after {
  content: "";
  display: inline-block;
  width: 8px;
  height: 1.1rem;
  background: #3b82f6;
  vertical-align: middle;
  margin-left: 2px;
  border-radius: 2px;
  box-shadow: 0 0 8px #3b82f6;
  animation: blink 0.8s infinite;
  opacity: 0;
}

.stream-output.is-streaming::after {
  opacity: 1;
  animation: none;
}

@keyframes blink {
  0%, 100% { opacity: 0; }
  50% { opacity: 1; }
}

.token-word {
  opacity: 0;
  display: inline-block;
  transform: translateY(4px);
  /* This margin-right perfectly replaces the collapsed space character */
  margin-right: 0.3em;
  transition: opacity 0.1s, transform 0.1s;
}

.token-word.visible {
  opacity: 1;
  transform: translateY(0);
}

.replay-btn {
  margin-top: 24px;
  background: transparent;
  color: #94a3b8;
  border: 1px solid #475569;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.replay-btn:hover {
  background: #334155;
  color: #f8fafc;
}

const rawContentElement = document.getElementById("raw-content");
const output = document.getElementById("stream-output");
const replayBtn = document.getElementById("replay-btn");

let streamInterval;

function startStreaming() {
  /* Clear previous content and reset state */
  output.innerHTML = "";
  output.classList.add("is-streaming");
  clearInterval(streamInterval);
  
  /* Create a queue of words without using array bracket indexing */
  const rawText = rawContentElement.innerText;
  const wordsQueue = rawText.split(" ");
  
  /* Stream tokens sequentially by injecting elements dynamically */
  streamInterval = setInterval(function() {
    if (wordsQueue.length > 0) {
      /* Extract the very first word from the array queue securely */
      const word = wordsQueue.shift();
      
      const span = document.createElement("span");
      span.className = "token-word";
      span.innerText = word;
      
      /* Appending forces the CSS ::after cursor to constantly move forward */
      output.appendChild(span);
      
      /* Trigger reflow to animate the fade-in seamlessly */
      setTimeout(function() {
        span.classList.add("visible");
      }, 10);
      
    } else {
      /* Queue is empty, finish generation */
      clearInterval(streamInterval);
      output.classList.remove("is-streaming");
    }
  }, 50); /* 50ms per token creates a realistic AI pacing */
}

replayBtn.addEventListener("click", startStreaming);

/* Start automatically on page load */
setTimeout(startStreaming, 500);