:root {
  --first-color: #0e2431;
  --second-color: #6a59d1;
  --third-color: #777;

  --hover-color: #614fd0;

  --body-bg-color: #fefefe;
  --card-bg-color: #fff;
  --popup-bg-color: #fff;

  --bg-transparent-color: rgba(0, 0, 0, 0.1);
  --transparent-color-01: rgba(0, 0, 0, 0.1);
  --transparent-color-01: rgba(106, 89, 209, 0.1);
  --line-color: #d7d7d7;

  --color-filter: invert(1);

  --box-shadow: 0px 0px 20px rgba(0 0 0 / 10%);

  --small-font-size: 0.9em;
  --normal-font-size: 1em;

  --scroll-bar-color: #c5cadf;
  --scroll-thumb-color: #70768a;
  --scroll-thumb-hover-color: #454f6b;

  --bg-color: #191f36;
  --snd-bf-color: #262b40;
  --text-color: #fff;
  --main-color: #59b1f4;

  --txt-color: #c2c2c2;
  --border-gradient: linear-gradient(to right, #2cff92, #1080cf);
}
.timeline {
  position: relative;
  max-width: 1200px;
  margin: 10px auto;
}
.skill-container {
  padding: 10px 50px;
  position: relative;
  width: 50%;
  height: 180px;
  /* background: rgba(0, 0, 0, 0.3); */
  animation: moveDown 1s linear forwards;
  opacity: 0;
}
@keyframes moveDown {
  0% {
    opacity: 1;
    transform: translateY(-30px);
  }
  100% {
    opacity: 1;
    transform: translateY(0px);
  }
}
.skill-container:nth-child(1) {
  animation-delay: 0s;
}
.skill-container:nth-child(2) {
  animation-delay: 1s;
}
.skill-container:nth-child(3) {
  animation-delay: 2s;
}
.skill-container:nth-child(4) {
  animation-delay: 3s;
}
.skill-container:nth-child(5) {
  animation-delay: 4s;
}
.skill-container:nth-child(6) {
  animation-delay: 5s;
}

.text-box {
  padding: 20px 30px;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(20px);
  position: relative;
  border-radius: 6px;
  font-size: 15px;
}
.left-container {
  left: 0;
}
.right-container {
  left: 50%;
}
.bullet {
  width: 2rem;
  height: 2rem;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(20px);
  border-radius: 50%;

  position: absolute;
  right: -3.5%;
  top: 32px;
  z-index: 10;
}
.right-container > .bullet {
  left: -2.3%;
}

.timeline::after {
  content: "";
  position: absolute;
  width: 6px;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(20px);
  top: 0;
  left: 50%;
  z-index: -1;
  animation: moveLine 6s linear forwards;
  border-radius: 50%;
}
@keyframes moveLine {
  0% {
    height: 0;
  }
  100% {
    height: 100%;
  }
}

.text-box h3 {
  font-weight: 600;
  color: var(--third-color);
}
.text-box h5 {
  display: inline-block;
  margin-bottom: 15px;
}
.items {
  list-style: none;
  padding: 0;
}
.items li {
  display: inline-block;
  margin-right: 10px;
  padding: 5px;
  margin-bottom: 2px;
}
.list li:nth-child(3n) {
  margin-right: 0;
  gap: 1rem;
}

.left-container-arrow {
  height: 0;
  width: 0;
  position: absolute;
  top: 28px;
  z-index: 1;
  border-top: 15px solid transparent;
  border-bottom: 15px solid transparent;
  border-left: 15px solid rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(20px);
  right: -15px;
}
.right-container-arrow {
  height: 0;
  width: 0;
  position: absolute;
  top: 28px;
  z-index: 1;
  border-top: 15px solid transparent;
  border-bottom: 15px solid transparent;
  border-right: 15px solid rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(20px);
  left: -15px;
}

@media screen and (max-width: 600px) {
  .skill-container {
    padding: 10px 50px;
    position: relative;
    width: 50%;
    height: max-content;
    animation: moveDown 1s linear forwards;
    opacity: 0;
  }
  .timeline {
    margin: 50px auto;
  }
  .timeline::after {
    left: 31px;
  }
  .skill-container {
    width: 100%;
    padding-left: 80px;
    padding-right: 25px;
  }
  .text-box {
    font-size: 13px;
  }
  .text-box h5 {
    margin-bottom: 10px;
  }
  .right-container {
    left: 0;
  }
  .left-container > .bullet {
    left: 18px;
  }
  .right-container > .bullet {
    left: 18px;
  }
  .left-container-arrow {
    display: none;
  }

  .right-container-arrow {
    border-radius: 15px solid black;
    border-right: 05;
    left: -15px;
    border-top-left-radius: 10;
  }
}