#letter-layer,
#letter-layer * {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

#letter-layer {
  color: #f5f5f5;
  opacity: 0;
  transition: opacity 0.7s linear;
}

#letter-layer.is-active {
  opacity: 1;
}

#letter-content {
  position: absolute;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
  width: min(88vw, 680px);
  padding: 0 2vw;
  font-family: "Times New Roman", serif;
  font-size: clamp(18px, 2.4vw, 22px);
  line-height: 1.65;
  text-align: center;
}

#letter-content p {
  margin: 0 0 22px;
}

#letter-content .word {
  display: inline-block;
  margin-right: 0.28em;
  opacity: 0;
  transform: translateY(0);
  will-change: opacity, transform;
}

@media (max-width: 600px) {
  #letter-content {
    width: min(92vw, 520px);
    font-size: clamp(17px, 4.2vw, 21px);
  }

  #letter-content p {
    margin-bottom: 18px;
  }
}