.reading-progress {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  height: 5px;
  background: transparent;
  pointer-events: none;
}

.reading-progress span {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, #ff6b6b, #ffd567, #7ee787, #74c0fc, #b197fc, #ff8cc6);
}

.article-page {
  max-width: 72rem;
  margin: 2rem auto 0;
}

.article-back {
  display: inline-flex;
  margin-bottom: 2.5rem;
  font-weight: 700;
}

.article-header {
  max-width: 54rem;
  margin-bottom: 3rem;
  padding-bottom: 2.25rem;
  border-bottom: 3px solid var(--ink);
}

.article-header__eyebrow {
  margin: 0 0 0.6rem;
  color: var(--ink-medium);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.article-header h1 {
  max-width: 18ch;
  margin: 0;
  font-size: clamp(2.5rem, 7vw, 5.5rem);
  line-height: 0.98;
}

.article-header__description {
  max-width: 42rem;
  margin: 1.5rem 0 0;
  color: var(--ink-medium);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  line-height: 1.5;
}

.article-header__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 1.4rem;
  color: var(--ink-medium);
  font-size: 0.9rem;
}

.article-page__themes {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}

.article-page__themes li {
  padding: 0.35rem 0.75rem;
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  background: var(--bg);
  box-shadow: 0.25rem 0.25rem var(--primary);
  font-size: 0.8rem;
  font-weight: 800;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(12rem, 16rem) minmax(0, 44rem);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}

.article-toc {
  position: sticky;
  top: 2rem;
  padding: 1rem;
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0.35rem 0.35rem var(--primary);
}

.article-toc__title {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.article-toc ol {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding-left: 1.15rem;
}

.article-toc li {
  font-size: 0.88rem;
  line-height: 1.35;
}

.article-toc li.is-subsection {
  margin-left: 0.75rem;
  color: var(--ink-medium);
  font-size: 0.82rem;
}

.article-toc a {
  text-decoration: none;
}

.article-toc a:hover {
  text-decoration: underline;
}

.article-body {
  min-width: 0;
  font-size: 1.05rem;
  line-height: 1.8;
}

.article-body > :first-child {
  margin-top: 0;
}

.article-body h2,
.article-body h3 {
  position: relative;
  scroll-margin-top: 2rem;
}

.article-body h2 {
  margin-top: 3.5rem;
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  line-height: 1.15;
}

.article-body h3 {
  margin-top: 2.5rem;
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  line-height: 1.2;
}

.heading-anchor {
  margin-left: 0.5rem;
  color: var(--ink-soft);
  text-decoration: none;
  opacity: 0;
  transition: opacity 0.15s ease;
}

.article-body h2:hover .heading-anchor,
.article-body h3:hover .heading-anchor,
.heading-anchor:focus-visible {
  opacity: 1;
}

.article-body p,
.article-body ul,
.article-body ol,
.article-body blockquote {
  max-width: 68ch;
}

.article-body blockquote {
  margin: 2rem 0;
  padding: 1rem 1.25rem;
  border-left: 5px solid var(--ink);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--primary-light);
  font-size: 1.08rem;
}

.article-body img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 2rem auto;
  border-radius: var(--radius);
}

.article-body hr {
  margin: 3rem 0;
  border: 0;
  border-top: 3px solid var(--ink);
}

.article-body code {
  padding: 0.1rem 0.35rem;
  border-radius: var(--radius-sm);
  background: #f3f3f3;
}

.article-body pre {
  overflow-x: auto;
  padding: 1rem;
  border: 3px solid var(--ink);
  border-radius: var(--radius);
  background: #f7f7f7;
}

.article-body pre code {
  padding: 0;
  background: transparent;
}

.article-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  max-width: 44rem;
  margin: 4rem 0 0 auto;
  padding: 1.25rem 0 0;
  border-top: 3px solid var(--ink);
}

.article-footer p {
  margin: 0;
  color: var(--ink-medium);
}

@media (max-width: 58rem) {
  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-toc {
    position: static;
    max-width: 44rem;
  }
}

@media (max-width: 40rem) {
  .article-page {
    margin-top: 1rem;
  }

  .article-header h1 {
    font-size: clamp(2.3rem, 13vw, 4rem);
  }

  .article-page__themes li {
    border-width: 2px;
    box-shadow: 0.2rem 0.2rem var(--primary);
  }

  .article-toc {
    border-width: 2px;
    box-shadow: 0.25rem 0.25rem var(--primary);
  }
}

@media (prefers-reduced-motion: reduce) {
  .heading-anchor {
    transition: none;
  }
}