body {
  font-family: "Marcellus", "Pretendard", serif;
  color: #333;
  background: #fff;
}

.historyContainer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 7rem 1rem;
  display: flex;
  align-items: flex-start;
  box-sizing: border-box;

}

.leftSide {
  width: 30%;
  padding-right: 2rem;
  box-sizing: border-box;
}

.rightSide {
  width: 70%;
  box-sizing: border-box;
}

.orangeLabel {
  font-size: 1rem;
  color: #0054b3;
  display: block;
  margin-bottom: 0.5rem;
}

.titleText {
  font-size: 1.8rem;
  line-height: 1.3;
  margin: 0;
}

.certGrid {
  display: grid;
  grid-template-columns: repeat(4, 1fr); 
  gap: 2rem;
}

.certItem {
  text-align: center;
  cursor: pointer;
}

.certItem img {
  width: 100%;
  border: 1px solid #ddd;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
  transition: transform 0.2s ease;
}

.certItem img:hover {
  transform: scale(1.03);
}

.certItem p {
  margin-top: 10px;
  font-size: 0.95rem;
}

/**/



.lightbox {
  display: none;
  position: fixed;
  z-index: 9999;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.lightbox.show {
  display: flex;
  opacity: 1;
}

.lightbox img {
  max-width: 90%;
  max-height: 90%;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
  border-radius: 8px;
  background: white;
  padding: 10px;
  opacity: 0;
  transform: scale(0.9);
  transition: all 0.3s ease;
}

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

.lightbox .closeBtn {
  position: absolute;
  top: 30px;
  right: 50px;
  color: white;
  font-size: 2.5rem;
  cursor: pointer;
  font-weight: bold;
}


@media (max-width: 1024px) {
  .certGrid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .historyContainer {
    flex-direction: column;
  }

  .leftSide,
  .rightSide {
    width: 100%;
    padding: 0;
  }

  .certGrid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .certGrid {
    grid-template-columns: 1fr;
  }
}