:root {
  --sonar-color: #f4df22;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  background-color: black;
  color: lightgrey;
}

.header {
  text-align: center;
  padding: 1em;
}

.header small {
  transition: 1s;
}

.header small:hover {
  color: var(--sonar-color);
  letter-spacing: 5px;
}

.gallery {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2em;
}

.gallery-image {
  max-width: 300px;
  cursor: pointer;
  border-radius: 8px;
  transition: transform 0.3s ease;
}

.gallery-image:hover {
  transform: scale(1.05);
}

.lightbox {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  justify-content: center;
  align-items: center;
}

.lightbox-content {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
}

.close {
  position: absolute;
  top: 20px;
  right: 40px;
  color: #fff;
  font-size: 40px;
  font-weight: bold;
  cursor: pointer;
  z-index: 1001;
}

.close:hover {
  color: #bbb;
}

.arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  color: #fff;
  font-size: 40px;
  font-weight: bold;
  cursor: pointer;
  padding: 20px;
  user-select: none;
  z-index: 1001;
}

.arrow-left {
  left: 20px;
}

.arrow-right {
  right: 20px;
}

.arrow:hover {
  color: #bbb;
}

.btn-section {
  text-align: center;
  padding: 2em;
  display: flex;
  gap: 15px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.5em 1em;
  color: lightgrey;
  border: 2px solid lightgrey;
  text-decoration: none;
  font-size: 15px;
  transition: 0.5s;
}

.btn:hover {
  color: black;
  background-color: var(--sonar-color);
  box-shadow: 5px 5px 0px var(--sonar-color);
  border: 2px solid black;
}