/* メインセクション背景 */
body {
  background-color: #6fa4c3;
}

.section-heading {
  font-size: 1.25rem; /* 20pt */
  color: #6d6c6c;
  border-bottom: 1px dotted #6d6c6c;
  margin-bottom: 20px;
}

.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
  max-width: 800px;
  margin: 0 auto;
}

.video-item {
  text-align: center;
  cursor: pointer;
}

.video-item img {
  width: 100%;
  height: auto;
  background-color: #333;
}

#video-popup {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

#video-popup.hidden {
  display: none;
}

.popup-content {
  position: relative;
  max-width: 80%;
  background: #000;
}

#close-popup {
  position: absolute;
  top: 10px;
  right: 20px;
  font-size: 30px;
  color: #fff;
  cursor: pointer;
  z-index: 1001;
}

#popup-video {
  width: 100%;
  height: auto;
}