:root {
  --card-height: 400px;
  --card-gap: 1em;
}

.about-banner-header {
  background-image: url("../images/main-banners/walpaper1.jpg");
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  width: 100%;
  height: 100%;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 0;
  padding: 12em 0;
}

.about-banner-header::before {
  background-color: rgba(0, 0, 0, 0.5);
  width: 100%;
  height: 100%;
  position: absolute;
  content: "";
  top: 0;
  left: 0;
  z-index: -1;
}

.about-title {
  text-align: center;
}

.about-title h2 {
  animation: glow 1s ease-in-out infinite alternate;
}

.about-icon {
  color: #fff;
  font-size: 1.3em;
  position: relative;
  padding: 3em 0;
  z-index: 5;
}

.about-icon::before {
  width: 2px;
  height: 35px;
  background: #ff0000;
  position: absolute;
  content: "";
  top: 0;
  left: 50%;
  transform: translateX(-50%);
}

.about-icon::after {
  width: 2px;
  height: 35px;
  background: #ff0000;
  position: absolute;
  content: "";
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
}

.about-icon .circle {
  width: 35px;
  height: 35px;
  background: #ff0000;
  margin: 0 auto;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0.5em;
  box-shadow: 0px 0px 1px 1px rgba(244, 244, 244, 0.8);
  animation: pulse-animation 2s infinite;
}

.about-icon img {
  width: 20px;
  height: 20px;
  filter: brightness(0) invert(1);
}

/************************ Users ************************/
.users {
  background: #000;
  padding: 4em 0;
}

.inner-users {
  position: relative;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--card-gap);

  height: var(--card-height);
}

.user-card {
  width: calc(25% - var(--card-gap));
  position: relative;
}

.user-area {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  position: absolute;
  width: 100%;
}

.user-wrapper {
  height: var(--card-height);
  position: relative;
  overflow: hidden;
}

.user-wrapper:before {
  content: "";
  position: absolute;
  top: 0;
  left: 180%;
  height: 100%;
  width: 100%;
  background: rgba(255, 255, 255, 0.3);
  z-index: 1;
  transform: skew(45deg);
  transition: 0.5s;
}

.user-wrapper:hover:before {
  left: -180%;
}

.user-wrapper img {
  height: 100%;
  object-fit: cover;
  width: 100%;
  filter: grayscale(100%);
  transition: 2s;
}
.user-wrapper:hover img {
  filter: grayscale(0%);
  transform: scale(1.1);
}

.user-wrapper h3 {
  font-size: 1.1em;
  background: #ff0000;
  color: #fff;
  text-align: center;
  text-transform: uppercase;
  margin: 0;
  padding: 0.5em;
  position: absolute;
  bottom: 0;
  width: 100%;
  transform: perspective(400px) rotateY(90deg);
  transform-origin: right;
  transition: 1s;
}

.user-wrapper:hover h3 {
  transform: perspective(400px) rotateY(0deg);
}

.user-wrapper ul {
  position: absolute;
  top: 0;
  left: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  background: rgba(255, 255, 255, 0);
}

.user-wrapper ul li {
  background: #333;
  height: 40px;
  width: 40px;
  text-align: center;
  line-height: 40px;
  transform: perspective(800px) rotateY(90deg);
  transition: 0.5s;
  transform-origin: left;
}

.user-wrapper:hover ul li {
  transform: perspective(800px) rotateY(0deg);
}

.user-wrapper:hover ul li:nth-child(1) {
  transition-delay: 0.2s;
}

.user-wrapper:hover ul li:nth-child(2) {
  transition-delay: 0.6s;
}

.user-wrapper:hover ul li:nth-child(3) {
  transition-delay: 0.8s;
}

.user-wrapper:hover ul li:nth-child(4) {
  transition-delay: 1s;
}

.user-wrapper ul li a {
  color: #ff0000;
  background: rgba(255, 255, 255, 0);
}

.user-wrapper ul li i {
  color: #ff0000;
  background: rgba(255, 255, 255, 0);
}

.user-wrapper ul li i:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0);
}

/************************ Animations ************************/

@keyframes pulse-animation {
  0% {
    box-shadow: 0 0 0 0px rgba(244, 244, 244, 0.2);
  }
  100% {
    box-shadow: 0 0 0 10px rgba(244, 244, 244, 0);
  }
}

@keyframes glow {
  from {
    text-shadow: 0 0 10px #fff, 0 0 20px #fff, 0 0 30px #ff0000,
      0 0 40px #ff0000, 0 0 50px #e71010, 0 0 60px #cd1a1a, 0 0 70px #d92f2f;
  }

  to {
    text-shadow: 0 0 20px #fff, 0 0 30px #4db2ff, 0 0 40px #ff0000,
      0 0 50px #ff0000, 0 0 60px #e71010, 0 0 70px #cd1a1a, 0 0 80px #d92f2f;
  }
}

/************************ Media Query ************************/
@media screen and (max-width: 992px) {
  .inner-users {
    height: calc(var(--card-height) * 2 + var(--card-gap) * 2);
  }
  .user-card {
    width: calc(50% - 1em);
  }

  .user-wrapper h3 {
    transform: perspective(800px) rotateY(90deg);
  }

  .user-wrapper:hover h3 {
    transform: perspective(400px) rotateY(0deg);
  }
}

@media screen and (max-width: 768px) {
  .about-banner-header {
    padding: 10em 0 3em;
  }

  .about-title h2 {
    font-size: 3em;
  }
}

@media screen and (max-width: 576px) {
  .about-title h2 {
    font-size: 2.5em;
  }

  .inner-users {
    height: calc(var(--card-height) * 4 + var(--card-gap) * 4);
  }
  .user-card {
    width: 100%;
  }

  .user-wrapper h3 {
    transform: perspective(800px) rotateY(90deg);
  }

  .user-wrapper:hover h3 {
    transform: perspective(400px) rotateY(0deg);
  }
}