/* Article page */

.read-progress {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
}

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

/* Head: same width as the reading column */
.article-head {
  max-width: 680px;
  margin: 0 auto;
  padding: clamp(1.5rem, 5vw, 3.5rem) 0 clamp(2rem, 5vw, 3rem);
}

.article-head .post-meta {
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.article-head__title {
  margin: 1.25rem 0 2rem;
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 1.5rem + 3vw, 4rem);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -0.045em;
  text-wrap: balance;
}

/* Long titles (often the article's own '# Title') get a calmer size */
.article-head__title--long {
  font-size: clamp(1.9rem, 1.4rem + 2.2vw, 3.1rem);
  letter-spacing: -0.035em;
}

.article-head__title--xlong {
  font-size: clamp(1.7rem, 1.3rem + 1.6vw, 2.6rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.byline {
  display: flex;
  gap: 0.9rem;
  align-items: center;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
}

.byline img {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  object-position: 60% 25%;
}

.byline p {
  display: grid;
  margin: 0;
  font-size: 0.9rem;
  font-weight: 700;
  line-height: 1.4;
}

.byline a {
  text-decoration: none;
}

.byline__role {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 500;
}

/* Layout: reading column + table of contents */
.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 680px);
  justify-content: center;
}

@media (min-width: 1200px) {
  .article-layout {
    grid-template-columns: 180px minmax(0, 680px) 180px;
    gap: 2.5rem;
  }

  .article-toc {
    position: sticky;
    top: 6rem;
    align-self: start;
    max-height: calc(100vh - 8rem);
    overflow-y: auto;
  }

  .article-content {
    grid-column: 2;
  }

  .article-toc summary {
    pointer-events: none;
  }

  .article-toc summary::after {
    display: none;
  }
}

.article-toc[hidden] {
  display: none;
}

.article-toc details {
  margin-bottom: 2rem;
  border-top: 1px solid var(--ink);
}

.article-toc summary {
  display: flex;
  justify-content: space-between;
  padding: 0.75rem 0;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  list-style: none;
  text-transform: uppercase;
  cursor: pointer;
}

.article-toc summary::-webkit-details-marker {
  display: none;
}

.article-toc summary::after {
  content: "+";
}

.article-toc details[open] summary::after {
  content: "−";
}

.article-toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: toc;
}

.article-toc__list li {
  counter-increment: toc;
}

.article-toc__list a {
  display: block;
  padding: 0.4rem 0 0.4rem 0.75rem;
  border-left: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.82rem;
  line-height: 1.4;
  text-decoration: none;
  transition: border-color 200ms ease, color 200ms ease;
}

.article-toc__list .is-sub a {
  padding-left: 1.5rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.article-toc__list a:hover,
.article-toc__list a.is-active {
  border-color: var(--accent);
  color: var(--ink);
}

/* Long-form typography */
.article-content {
  min-width: 0;
  color: var(--ink-soft);
  font-size: clamp(1.02rem, 0.98rem + 0.2vw, 1.1rem);
  line-height: 1.85;
}

.article-content > * + * {
  margin-top: 1.4em;
}

.article-content p {
  margin-bottom: 0;
}

.article-content > p:first-of-type {
  color: var(--ink);
  font-size: 1.15em;
  line-height: 1.75;
}

.article-content .has-dropcap::first-letter {
  float: left;
  margin: 0.1em 0.12em 0 0;
  color: var(--accent);
  font-family: var(--font-serif);
  font-size: 4.1em;
  font-weight: 700;
  line-height: 0.8;
}

.article-content h2,
.article-content h3,
.article-content h4 {
  margin-top: 2.4em;
  margin-bottom: 0;
  color: var(--ink);
  font-family: var(--font-serif);
  line-height: 1.2;
  scroll-margin-top: 6rem;
}

.article-content h2 {
  font-size: 1.85em;
  letter-spacing: -0.03em;
}

.article-content h3 {
  font-size: 1.4em;
}

.article-content h4 {
  font-family: var(--font-sans);
  font-size: 1.05em;
}

.article-content h2 + *,
.article-content h3 + *,
.article-content h4 + * {
  margin-top: 0.8em;
}

.article-content a {
  color: var(--ink);
  text-decoration-color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

.article-content a:hover {
  color: var(--accent-dark);
}

.article-content strong {
  color: var(--ink);
}

.article-content hr {
  width: 4rem;
  margin: 3em auto;
  border: 0;
  border-top: 2px solid var(--accent);
}

.article-content ul,
.article-content ol {
  padding-left: 1.3em;
}

.article-content li + li {
  margin-top: 0.4em;
}

.article-content li::marker {
  color: var(--accent);
}

.article-content blockquote {
  position: relative;
  margin: 2.2em 0;
  padding: 0.25em 0 0.25em 1.75em;
  border-left: 2px solid var(--accent);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 1.25em;
  font-style: italic;
  line-height: 1.5;
}

.article-content blockquote::before {
  position: absolute;
  top: -0.35em;
  left: 0.3em;
  color: var(--accent);
  font-size: 2.2em;
  line-height: 1;
  content: "“";
  opacity: 0.35;
}

.article-content blockquote p {
  margin: 0;
}

.article-content code:not(pre code) {
  padding: 0.12em 0.35em;
  background: var(--surface-soft);
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: 0.86em;
}

/* Code blocks (wrapped by article.js) */
.code-block {
  margin: 2em 0;
  border: 1px solid #2b2b2b;
  background: #272822;
}

.code-block__bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.45rem 0.9rem;
  border-bottom: 1px solid #3a3a33;
  color: #b3b1a7;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.code-block__copy {
  padding: 0.2rem 0.5rem;
  border: 1px solid #4a4a42;
  background: transparent;
  color: #d8d6cc;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.code-block__copy:hover {
  border-color: var(--accent);
  color: #fff;
}

.article-content pre,
.code-block pre[class*="language-"] {
  margin: 0 !important;
  padding: 1.1rem 1.2rem !important;
  border: 0 !important;
  border-radius: 0 !important;
  background: #272822 !important;
  color: #f8f8f2;
  font-size: 0.86rem;
  line-height: 1.65;
}

.article-content > pre {
  margin: 2em 0 !important;
}

/* Tables */
.table-scroll {
  margin: 2em 0;
  overflow-x: auto;
  border: 1px solid var(--line);
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9em;
}

.article-content th,
.article-content td {
  padding: 0.7rem 0.9rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.article-content th {
  background: var(--surface-soft);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.8em;
  font-weight: 500;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.article-content tbody tr:nth-child(even) {
  background: color-mix(in srgb, var(--surface-soft) 45%, transparent);
}

/* Math */
.article-content mjx-container[display="true"] {
  max-width: 100%;
  margin: 1.6em 0 !important;
  padding: 0.25em 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.article-content mjx-container:not([display="true"]) {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  vertical-align: middle;
}

/* Media */
.article-content img,
.article-content video {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 2em auto;
}

.article-content figure {
  margin: 2.2em 0;
}

.article-content figure img {
  margin: 0 auto;
}

.article-content figcaption {
  margin-top: 0.75rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  text-align: center;
}

.article-content .is-zoomable {
  cursor: zoom-in;
}

.lightbox {
  max-width: 94vw;
  max-height: 94vh;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: zoom-out;
}

.lightbox::backdrop {
  background: rgba(10, 10, 9, 0.88);
}

.lightbox img {
  display: block;
  max-width: 94vw;
  max-height: 94vh;
  object-fit: contain;
}

.lightbox__close {
  position: fixed;
  top: 1rem;
  right: 1rem;
  border-color: rgba(255, 255, 255, 0.4);
  color: #fff;
}

/* End of article */
.article-end {
  max-width: 680px;
  margin: clamp(3rem, 7vw, 5rem) auto 0;
}

.share {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.share__list {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}

.share__list .icon-btn {
  text-decoration: none;
}

.share__list .copy-btn {
  height: 2.5rem;
  padding: 0 0.9rem;
  border-radius: var(--radius-pill);
}

.author-card {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 1.5rem;
  margin: 2.5rem 0;
  padding: clamp(1.25rem, 4vw, 2rem);
  background: var(--surface-soft);
}

.author-card img {
  width: 96px;
  height: 96px;
  object-fit: cover;
  object-position: 60% 25%;
  filter: grayscale(0.9);
}

.author-card p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.author-card__name {
  margin: 0.35rem 0 0.4rem !important;
  color: var(--ink) !important;
  font-family: var(--font-serif);
  font-size: 1.5rem !important;
  font-weight: 700;
}

.author-card__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  margin-top: 1rem;
}

.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.post-nav__item {
  display: grid;
  gap: 0.5rem;
  align-content: start;
  padding: 1.25rem;
  border: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  transition: border-color 200ms ease, background-color 200ms ease;
}

.post-nav__item:hover {
  border-color: var(--ink);
  background: var(--surface);
  color: var(--ink);
}

.post-nav__item--next {
  grid-column: 2;
  text-align: right;
}

.post-nav__dir {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.post-nav__title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1.2;
}

.post-nav__item:hover .post-nav__title {
  color: var(--accent-dark);
}

.post-nav__topic {
  color: var(--accent-dark);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* Related posts */
.related {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 3vw, 2rem);
}

.related__item {
  display: grid;
  gap: 0.6rem;
  align-content: start;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
}

.related__item:hover {
  border-color: var(--accent);
  color: var(--ink);
}

.related__meta {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

.related__title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.15;
}

.related__item:hover .related__title {
  color: var(--accent-dark);
}

.related__excerpt {
  color: var(--ink-soft);
  font-size: 0.88rem;
}

@media (max-width: 767.98px) {
  .post-nav,
  .related {
    grid-template-columns: 1fr;
  }

  .post-nav__item--next {
    grid-column: auto;
  }

  .author-card {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 1rem;
  }

  .author-card img {
    width: 64px;
    height: 64px;
  }
}