html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

/* Page state backgrounds */
body.menu-mode { background: #000; }        /* only when MENU is showing */
body.section-mode { background: #f5f5f5; }  /* when a SECTION is showing */


/* Background video */
#bg-video {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -1;
}

/* Menu */
.menu {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100%;
  text-align: center;
  gap: 40px;
  position: relative;
  z-index: 1;
}

.menu a {
  font-size: 2.5rem;
  text-decoration: none;
  color: #00f;
  cursor: pointer;
  transition: 0.3s;
}

.menu a:hover {
  color: #ff0;
  
}

/* Sections */
section {
  display: none;
  padding: 0;
  height: 100%;
  box-sizing: border-box;
}



img, video {
  max-width: 100%;
  display: block;
  margin: 20px 0;
}

.back-button {
  display: inline-block;
  padding: 8px 20px;
  margin-top: 20px;
  border: 2px solid #222;
  border-radius: 8px;
  text-decoration: none;
  color: #222;
}

.back-button:hover {
  background: #222;
  color: #fff;
}
/* CSS Document */