* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: linear-gradient(135deg, #0f0f1a 0%, #1a1a2e 50%, #0f0f1a 100%);
  min-height: 100vh;
  font-family:
    "Segoe UI",
    system-ui,
    -apple-system,
    sans-serif;
  color: #fff;
}

canvas {
  position: absolute;
  top: 0;
  left: 0;
}

/* Start overlay */
#start-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 10, 20, 0.95);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  cursor: pointer;
}

#start-overlay button {
  font-size: 1.5rem;
  padding: 1.25rem 3rem;
  cursor: pointer;
  background: linear-gradient(135deg, #d85167 0%, #b34455 100%);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-weight: 600;
  letter-spacing: 0.5px;
  box-shadow:
    0 0 50px rgba(216, 81, 103, 0.2),
    0 8px 32px rgba(0, 0, 0, 0.3);
  transition: all 0.3s ease;
}

#start-overlay button:hover {
  transform: scale(1.05);
}

/* Container styling */
#hello-container,
#calibrate-container {
  max-width: 500px;
  margin: 0 auto;
  padding: 3rem 2rem;
  text-align: center;
}

#hello-container h1:first-child,
#calibrate-container h1:first-child {
  font-size: 2.5rem;
  margin: 0 0 1rem 0;
  background: linear-gradient(135deg, #d85167, #4d9fff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

#hello-container h1:last-of-type,
#calibrate-container h1:last-of-type {
  font-size: 1.1rem;
  font-weight: 400;
  color: #a0a0b0;
  line-height: 1.6;
  margin: 0 0 2.5rem 0;
}

/* QR code styling */
#qrcode {
  display: block;
  margin: 0 auto;
  padding: 1rem;
  background: #fff;
  border-radius: 16px;
  box-shadow:
    0 0 40px rgba(77, 159, 255, 0.3),
    0 20px 60px rgba(0, 0, 0, 0.4);
}

/* Hide empty h1 */
#hello-container h1:empty,
#calibrate-container h1:empty {
  display: none;
}