*, *::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;
}

.voice-app {
  position: relative;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

#ripple-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

.mic-container {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  /* Shift slightly to ensure we test dynamic alignment */
  margin-top: -50px; 
}

.mic-btn {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.2s, box-shadow 0.2s;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

.mic-btn.active {
  transform: scale(0.9);
  background: #38bdf8;
  border-color: #7dd3fc;
  color: #0f172a;
  box-shadow: 0 0 50px rgba(56, 189, 248, 0.5);
}

.helper-text {
  margin-top: 30px;
  color: #94a3b8;
  font-size: 1.125rem;
  letter-spacing: 1px;
  transition: color 0.2s, text-shadow 0.2s;
}

const canvas = document.getElementById("ripple-canvas");
const ctx = canvas.getContext("2d");
const micBtn = document.getElementById("mic-btn");
const helpText = document.getElementById("help-text");

let width = window.innerWidth;
let height = window.innerHeight;
canvas.width = width;
canvas.height = height;

window.addEventListener("resize", function() {
  width = window.innerWidth;
  height = window.innerHeight;
  canvas.width = width;
  canvas.height = height;
});

const ripples = new Array();
let isListening = false;
let rippleTimer = null;

function spawnRipple() {
  /* Precisely calculate the button center directly from the DOM */
  const rect = micBtn.getBoundingClientRect();
  const centerX = rect.left + (rect.width / 2);
  const centerY = rect.top + (rect.height / 2);
  
  const r = new Object();
  r.x = centerX;
  r.y = centerY;
  /* Start the ripple exactly at the button edge */
  r.radius = rect.width / 2;
  r.alpha = 1;
  /* Add randomness to mimic sound modulation */
  r.speed = Math.random() * 2 + 3; 
  
  ripples.push(r);
}

micBtn.addEventListener("pointerdown", function(e) {
  isListening = true;
  micBtn.classList.add("active");
  micBtn.setPointerCapture(e.pointerId);
  
  helpText.innerText = "Listening...";
  helpText.style.color = "#38bdf8";
  helpText.style.textShadow = "0 0 10px rgba(56,189,248,0.5)";
  
  /* Spawn ripples rapidly while holding */
  rippleTimer = setInterval(spawnRipple, 120);
});

function stopListening() {
  isListening = false;
  micBtn.classList.remove("active");
  helpText.innerText = "Hold to speak";
  helpText.style.color = "#94a3b8";
  helpText.style.textShadow = "none";
  clearInterval(rippleTimer);
}

micBtn.addEventListener("pointerup", stopListening);
micBtn.addEventListener("pointercancel", stopListening);

function animate() {
  ctx.clearRect(0, 0, width, height);
  
  for (let i = 0; i < ripples.length; i++) {
    const r = ripples.at(i);
    
    r.radius += r.speed;
    r.alpha -= 0.015;
    
    if (r.alpha > 0) {
      ctx.beginPath();
      ctx.arc(r.x, r.y, r.radius, 0, Math.PI * 2);
      ctx.strokeStyle = "rgba(56, 189, 248, " + r.alpha + ")";
      ctx.lineWidth = 3;
      ctx.stroke();
    }
  }
  
  /* Clean up dead ripples safely */
  while (ripples.length > 0 && ripples.at(0).alpha <= 0) {
    ripples.shift();
  }
  
  window.requestAnimationFrame(animate);
}

animate();