body {
  margin: 0;
  overflow: hidden;
  background: black;
}

#background-video,
#main-video {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 1s ease;
}

.button-start {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  padding: 30px 60px;
  font-size: 60px;
  color: #faf9f6;
  background-color: rgba(36, 36, 36, 0.7);
  border: #faf9f6 5px solid;
  transition: transform 0.5s ease, box-shadow 0.5s ease, background-color 0.5s ease;
  cursor: pointer;
}

.button-start-active {
  box-shadow: 0 0 45px #faf9f6d2; /* hvid glød */
  background-color: rgba(255, 255, 255, 0.05); /* subtil hvid tone ved tryk */
}

/* Hide main video until button is clicked */
.hidden {
  opacity: 0;
  pointer-events: none;
}
.visible {
  opacity: 1;
  pointer-events: auto;
}
.fade-out {
  opacity: 0;
  transition: opacity 0.8s;
}

/* Den hedder tilbage knap fordi det er det billedet hedder, men den får der egentlig frem til næste side */
.tilbage-knap {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 10;
  width: 120px;
  height: auto;
  background: transparent;
  border: none;
  padding: 0;
  opacity: 0;
  pointer-events: none;
  cursor: pointer;
  transition: opacity 0.5s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tilbage-knap.visible {
  opacity: 1;
  pointer-events: auto;
}

.tilbage-knap.hidden {
  opacity: 0;
  pointer-events: none;
}

.tilbage-knap img {
  width: 100%;
  height: 100%;
  display: block;
  transform: scaleX(-1); /* flipper billedet */
}