/* Article page: reading progress, header, contents, body, related articles. */

.progress {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 60;
  height: 4px;
}

.progress__bar {
  display: block;
  height: 100%;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
}

.article__head {
  padding-block: clamp(2rem, 1.5rem + 3vw, 4rem);
  color: var(--white);
}

.article__head-grid {
  display: grid;
  align-items: center;
  gap: 2rem;
}

.article__kicker {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.875rem;
  font-family: var(--ff-head);
  font-size: var(--fs-tiny);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.article__no {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--accent);
  letter-spacing: 0;
}

.article__title {
  font-size: var(--fs-h1);
}

.article__lead {
  margin-top: 1rem;
  font-size: var(--fs-lead);
}

.article__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
  list-style: none;
  font-size: var(--fs-tiny);
}

.article__facts li {
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  background: rgba(16, 48, 62, 0.35);
}

.article__img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.article__layout {
  display: grid;
  gap: 1.5rem;
  padding: clamp(1.25rem, 0.75rem + 2.5vw, 3rem);
  border-radius: var(--radius-l);
  background: var(--white);
}

.toc {
  border-radius: var(--radius);
  background: var(--mist);
}

.toc__toggle {
  padding: 0.9rem 1.125rem;
  font-family: var(--ff-head);
  font-weight: 700;
  cursor: pointer;
}

.toc__list {
  display: grid;
  gap: 0.15rem;
  padding: 0 0.5rem 0.75rem;
  list-style: none;
}

.toc__link {
  display: flex;
  gap: 0.6rem;
  padding: 0.45rem 0.6rem;
  border-radius: var(--radius-s);
  font-size: var(--fs-small);
  line-height: 1.4;
  text-decoration: none;
}

.toc__no {
  color: var(--accent-deep);
  font-family: var(--ff-head);
  font-weight: 700;
}

.toc__link:hover,
.toc__link--current {
  background: var(--white);
}

.article__body {
  max-width: 42rem;
  font-size: var(--fs-read);
  line-height: 1.8;
}

.article__opening {
  margin-bottom: 1.5rem;
  font-size: var(--fs-lead);
  font-weight: 500;
}

.chapter {
  scroll-margin-top: calc(var(--navbar-h) + 1rem);
}

.chapter + .chapter {
  margin-top: 2.5rem;
}

.chapter__title {
  margin-bottom: 0.875rem;
  font-size: var(--fs-h3);
  scroll-margin-top: calc(var(--navbar-h) + 1rem);
}

.chapter p + p {
  margin-top: 0.875rem;
}

.related {
  margin-top: var(--band);
}

.related__title {
  margin-bottom: 1.5rem;
  font-size: var(--fs-h2);
}

.related__list {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 60em) {
  .article__head-grid {
    grid-template-columns: 1.2fr 1fr;
  }
}

@media (min-width: 64em) {
  .article__layout {
    grid-template-columns: 17rem 1fr;
    gap: 3rem;
  }

  .article__side {
    position: relative;
  }

  .toc {
    position: sticky;
    top: calc(var(--navbar-h) + 1.25rem);
  }

  .toc__toggle {
    list-style: none;
    cursor: default;
  }

  .toc__toggle::-webkit-details-marker {
    display: none;
  }

  .related__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}