/* Japanese Matrix Background */
.jp-matrix-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: #05050a;
  overflow: hidden;
  z-index: -1;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(35px, 1fr));
  grid-auto-rows: 35px;
  font-size: 28px;
  color: rgba(0, 150, 255, 0.4);
  font-family: "Courier New", Courier, monospace;
  padding: 0;
  margin: 0;
}

.jp-matrix-bg > span {
  text-align: center;
  text-shadow: 0 0 5px rgba(0, 150, 255, 0.5);
  user-select: none;
  transition: color 0.5s, text-shadow 0.5s;
  line-height: 1;
}

.jp-matrix-bg > span:nth-child(19n + 2) {
  animation: smooth-pulse 3.5s ease-in-out infinite 0.2s;
}

.jp-matrix-bg > span:nth-child(29n + 1) {
  animation: smooth-pulse 4.1s ease-in-out infinite 0.7s;
}

.jp-matrix-bg > span:nth-child(11n) {
  color: rgba(100, 200, 255, 0.7);
  animation: smooth-pulse 2.9s ease-in-out infinite 1.1s;
}

.jp-matrix-bg > span:nth-child(37n + 10) {
  animation: smooth-pulse 5.3s ease-in-out infinite 1.5s;
}

.jp-matrix-bg > span:nth-child(41n + 1) {
  animation: smooth-pulse 3.9s ease-in-out infinite 0.4s;
}

.jp-matrix-bg > span:nth-child(17n + 9) {
  animation: smooth-pulse 2.8s ease-in-out infinite 0.9s;
}

.jp-matrix-bg > span:nth-child(23n + 18) {
  animation: smooth-pulse 4.3s ease-in-out infinite 1.3s;
}

.jp-matrix-bg > span:nth-child(31n + 4) {
  animation: smooth-pulse 5.6s ease-in-out infinite 0.1s;
}

.jp-matrix-bg > span:nth-child(43n + 20) {
  animation: smooth-pulse 3.6s ease-in-out infinite 1.8s;
}

.jp-matrix-bg > span:nth-child(13n + 6) {
  animation: smooth-pulse 3.2s ease-in-out infinite 1.2s;
}

.jp-matrix-bg > span:nth-child(53n + 5) {
  animation: smooth-pulse 4.9s ease-in-out infinite 0.5s;
}

.jp-matrix-bg > span:nth-child(47n + 15) {
  animation: smooth-pulse 5.9s ease-in-out infinite 1s;
}

@keyframes smooth-pulse {
  0%, 100% {
    color: rgba(0, 150, 255, 0.4);
    text-shadow: 0 0 5px rgba(0, 150, 255, 0.5);
  }
  30% {
    color: rgba(100, 200, 255, 1);
    text-shadow:
      0 0 10px rgba(100, 200, 255, 1),
      0 0 15px rgba(100, 200, 255, 1);
  }
  50% {
    color: rgba(255, 105, 180, 1);
    text-shadow:
      0 0 10px rgba(255, 105, 180, 1),
      0 0 15px rgba(255, 105, 180, 1);
  }
  70% {
    color: #ffffff;
    text-shadow:
      0 0 10px #fff,
      0 0 15px #fff,
      0 0 20px #fff;
  }
}