* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: Arial, Helvetica, sans-serif;
}

body {
  background: #ffffff;
  color: #003b9f;
}


.gallery-header {
  text-align: center;
  padding: 80px 20px 40px;
}

.gallery-header h1 {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 10px;
}

.gallery-header p {
  font-size: 16px;
  letter-spacing: 1px;
  opacity: 0.8;
}


.gallery {
  max-width: 1200px;
  margin: auto;
  padding: 40px 20px 80px;

  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}


.gallery-item {
  position: relative;
  overflow: hidden;
  border-radius: 24px;
  cursor: pointer;

  box-shadow: 0 20px 40px rgba(0,0,0,0.15);
  transition: transform 0.4s ease;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;

  transition: transform 0.6s ease;
}


.gallery-item:hover img {
  transform: scale(1.15);
}


.overlay {
  position: absolute;
  inset: 0;

  background: linear-gradient(
    to top,
    rgba(0,59,159,0.9),
    rgba(0,59,159,0.1)
  );

  display: flex;
  align-items: flex-end;
  padding: 30px;

  opacity: 0;
  transition: opacity 0.4s ease;
}

.gallery-item:hover .overlay {
  opacity: 1;
}


.overlay span {
  color: #ffffff;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 1px;

  transform: translateY(20px);
  transition: transform 0.4s ease;
}

.gallery-item:hover .overlay span {
  transform: translateY(0);
}


@media (max-width: 600px) {
  .gallery-header h1 {
    font-size: 34px;
  }
}

.back-home {
  position: fixed;
  top: 30px;
  left: 30px;

  width: 48px;
  height: 48px;

  background: #003b9f;
  border: 2px solid #ffffff;
  border-radius: 50%;

  display: flex;
  align-items: center;
  justify-content: center;

  box-shadow: 0 12px 30px rgba(0,0,0,0.2);
  cursor: pointer;

  opacity: 0;
  transform: translateY(-10px);
  animation: fadeInBtn 0.8s ease forwards;

  transition: transform 0.3s ease, opacity 0.3s ease, background 0.3s ease;
  z-index: 1000;
}


.back-home img {
  width: 22px;
  height: 22px;
}


.back-home:hover {
  background: #003b9f;
}

.back-home:hover img {
  filter: brightness(0) invert(1);
}


.back-home.hide {
  opacity: 0;
  transform: translateY(-20px);
  pointer-events: none;
}


@keyframes fadeInBtn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}


.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);

  display: flex;
  align-items: center;
  justify-content: center;

  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease;

  z-index: 2000;
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
}


.lightbox-img {
  max-width: 90%;
  max-height: 85%;
  border-radius: 20px;

  transform: scale(0.8);
  transition: transform 0.4s ease;

  box-shadow: 0 30px 80px rgba(0,0,0,0.6);
}

.lightbox.active .lightbox-img {
  transform: scale(1);
}


.lightbox-close {
  position: absolute;
  top: 30px;
  right: 40px;

  font-size: 42px;
  color: #ffffff;
  cursor: pointer;
  font-weight: 300;

  transition: opacity 0.3s ease, transform 0.3s ease;
}

.lightbox-close:hover {
  opacity: 0.7;
  transform: rotate(90deg);
}