body::after {
  content: "";
  display: inline-block;
  width: 100vw;
  height: 100vh;

  /* F-6-3: 568 KB PNG → AVIF 8 KB / WebP 12 KB. PNG fallback для старых браузеров. */
  background: url(../img/background.png) center/cover no-repeat;
  background-image: image-set(
    url(../img/background.avif) type("image/avif"),
    url(../img/background.webp) type("image/webp"),
    url(../img/background.png)
  );
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  position: fixed;
  top: 0;
  left: 0;
  z-index: -2;
}

.online-title {
  margin-bottom: 2rem;
}

.format {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.format-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.format-details {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.format-details-title {
  font-weight: 600;
}

.format-details ul {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  list-style: disc;
  padding-left: 3rem;
}

.format-details ul li {
  list-style: disc;
}

.format-details ul li::marker {
  color: var(--color-blue);
}

.format-details > p > span {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-right: 0.5rem;
}

.format-details > p > span:not(:last-of-type)::after {
  content: "";
  display: inline-block;
  width: 24px;
  height: 9px;
  background: url(../img/icons/arrow-straight.svg) center/contain no-repeat;
}

.format button {
  margin-top: 1rem;
}