:root {
  /* news/blog cream */
  --bg: #faf9f5;
  --ink: #141413;
  --muted: #6b6b66;
  --muted-2: #87867f;
  --accent: #d97757;
  --rule: rgba(20, 20, 19, 0.1);
  --aside-bg: rgba(20, 20, 19, 0.025);

  /* TML-pattern type stack */
  --display: "Newsreader", "Source Serif 4", Georgia, serif;
  --serif:
    "Source Serif 4", "Iowan Old Style", "Iowan Old Style BT", Georgia,
    "Times New Roman", serif;
  --sans:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial,
    sans-serif;
  /* 楷体 stack for literature: LXGW WenKai (jsDelivr) then system 楷体 fallbacks. */
  --xingkai:
    "LXGW WenKai", "LXGW WenKai Screen", "STKaiti", "KaiTi", "楷体",
    "Source Serif 4", serif;

  /* Layout */
  --content-width: 660px;
  --aside-width: 200px;
  --aside-gap: 2.5rem;
  --toc-width: 220px;
  --toc-gap: 2rem;
  --shell-max: 1200px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.65;
  font-variation-settings: "opsz" 14;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

.page {
  width: 100%;
  padding-bottom: 6rem;
}

/* ===================================================================
   HERO
   =================================================================== */

.page__hero {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 5.5rem 1.6rem 3rem;
}

.hero__name {
  font-family: var(--display);
  font-weight: 600;
  font-size: 2rem;
  line-height: 1.25;
  letter-spacing: -0.012em;
  margin: 0 0 0.45rem;
  font-variation-settings: "opsz" 32;
  display: flex;
  align-items: center;
  gap: 0.55em;
}

.hero__seal {
  height: 1.3em;
  width: auto;
  display: inline-block;
  mix-blend-mode: multiply;
  transform: translateY(-0.02em);
}

.hero__sub {
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 400;
  color: var(--muted);
  margin: 0;
}

/* ===================================================================
   SHELL: 3-column grid (toc | content | aside-gutter)
   =================================================================== */

.page__shell {
  display: grid;
  grid-template-columns:
    minmax(0, 1fr)
    minmax(0, var(--content-width))
    minmax(0, 1fr);
  column-gap: var(--toc-gap);
  align-items: start;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 1.6rem;
}

/* ===================================================================
   LEFT TOC
   =================================================================== */

.left-toc {
  grid-column: 1;
  justify-self: end;
  position: sticky;
  top: 3.5rem;
  max-width: var(--toc-width);
  padding-left: 1.2rem; /* room for active dot */
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.left-toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.left-toc li {
  margin: 0 0 0.55rem;
  position: relative;
}

.left-toc a {
  color: var(--muted-2);
  text-decoration: none;
  transition: color 0.2s ease;
  position: relative;
  display: inline-block;
}

.left-toc a:hover {
  color: var(--ink);
}

.left-toc a.is-active {
  color: var(--ink);
  font-weight: 500;
}

/* Single animated dot that translates between active TOC entries */
.toc-marker {
  position: absolute;
  left: 0.05rem;
  top: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0;
  pointer-events: none;
  transform: translateY(0);
  transition:
    transform 0.55s cubic-bezier(0.32, 0.72, 0, 1),
    opacity 0.25s ease;
  will-change: transform;
}

.toc-marker.is-visible {
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  .toc-marker {
    transition: opacity 0.15s ease;
  }
}

/* ===================================================================
   CONTENT
   =================================================================== */

.content {
  grid-column: 2;
  width: 100%;
  min-width: 0;
}

.section {
  margin-bottom: 4.5rem;
  scroll-margin-top: 2rem;
}

.section:last-child {
  margin-bottom: 0;
}

.section__title {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1.5rem;
}

/* About prose paragraphs — only "reading prose" on the page, slightly larger.
   Scoped to direct children so nested <p>s (e.g. .post-list__excerpt) aren't
   inadvertently pulled up to 17px. */
.section > p {
  margin: 0 0 1.25rem;
  font-size: 17px;
  line-height: 1.65;
}
.section > p:last-child {
  margin-bottom: 0;
}

.section a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 55%, transparent);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition:
    text-decoration-color 0.2s ease,
    color 0.2s ease;
}

.section a:hover {
  text-decoration-color: var(--accent);
  color: var(--accent);
}

/* ===================================================================
   SECTION ASIDE (margin notes — float into right gutter)
   =================================================================== */

.section__aside {
  float: right;
  clear: right;
  width: var(--aside-width);
  margin-right: calc(-1 * (var(--aside-width) + var(--aside-gap)));
  margin-left: var(--aside-gap);
  margin-top: 0.35rem;
  margin-bottom: 1.5rem;
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
}

.section__aside h3 {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--muted-2);
  margin: 0 0 0.7rem;
}

.section__aside ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.section__aside li {
  margin-bottom: 0.4rem;
}

.section__aside a {
  color: var(--ink);
  text-decoration: none;
  transition: color 0.2s ease;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}

.section__aside a:hover {
  color: var(--accent);
  border-bottom-color: color-mix(in srgb, var(--accent) 50%, transparent);
}

/* Portrait at the top of the About aside */
.aside-portrait {
  margin: 0 0 1.1rem;
}

.aside-portrait img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 2px;
  filter: saturate(0.92) contrast(0.98);
}

/* Icon list (Find me) */
.icon-list a {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  border-bottom: none;
  padding-bottom: 0;
}

.icon-list a .label,
.icon-list a span {
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: border-color 0.2s ease;
}

.icon-list a:hover span {
  border-bottom-color: color-mix(in srgb, var(--accent) 50%, transparent);
}

.icon {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
  color: var(--muted);
  transition: color 0.2s ease;
}

.icon-list a:hover .icon {
  color: var(--accent);
}

/* ===================================================================
   INLINE TABS IN SECTION TITLE
   (e.g.,  BLOG — TECHNICAL / 文学)
   =================================================================== */

.section__title--with-tabs {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.section__title-sep {
  color: var(--muted-2);
  opacity: 0.6;
  font-weight: 400;
}

.section__tabs {
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
}

.section__tab {
  background: none;
  border: 0;
  padding: 0;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  letter-spacing: inherit;
  text-transform: inherit;
  color: var(--muted-2);
  cursor: pointer;
  transition: color 0.2s ease;
}

.section__tab:hover {
  color: var(--ink);
}

.section__tab.is-active {
  color: var(--accent);
}

.section__tab-sep {
  color: var(--muted-2);
  opacity: 0.45;
}

.section__tab:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 60%, transparent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ===================================================================
   SCROLLABLE POST LIST CONTAINER
   =================================================================== */

.post-list-scroll {
  max-height: 22rem;
  overflow-y: auto;
  padding-right: 0.75rem;
  margin-right: -0.75rem;
  scrollbar-width: thin;
  scrollbar-color: var(--rule) transparent;
}

.post-list-scroll::-webkit-scrollbar {
  width: 6px;
}
.post-list-scroll::-webkit-scrollbar-track {
  background: transparent;
}
.post-list-scroll::-webkit-scrollbar-thumb {
  background: var(--rule);
  border-radius: 3px;
}
.post-list-scroll::-webkit-scrollbar-thumb:hover {
  background: var(--muted-2);
}

/* Fade hint at the bottom suggesting more content */
.post-list-scroll {
  mask-image: linear-gradient(
    to bottom,
    black 0,
    black calc(100% - 2.5rem),
    transparent 100%
  );
  -webkit-mask-image: linear-gradient(
    to bottom,
    black 0,
    black calc(100% - 2.5rem),
    transparent 100%
  );
}

/* ===================================================================
   BLOG POST LIST
   =================================================================== */

.post-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-list li {
  margin: 0 0 1.75rem;
  padding: 0;
}

.post-list li:last-child {
  margin-bottom: 0;
}

.post-list a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  text-decoration: none;
  color: var(--ink);
  margin-bottom: 0.3rem;
}

.post-list__title {
  font-family: var(--serif);
  font-variation-settings: "opsz" 16;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.35;
  transition: color 0.2s ease;
}

.post-list a:hover .post-list__title {
  color: var(--accent);
}

.post-list__date {
  font-family: var(--sans);
  font-size: 12.5px;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
  letter-spacing: 0.02em;
}

.post-list__excerpt {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.55;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Literature panel: 楷体 (LXGW WenKai). Sized slightly larger than the tech
   panel because Chinese characters need more pixel area for the same legibility. */
#panel-lit .post-list__title {
  font-family: var(--xingkai);
  font-weight: 400;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

#panel-lit .post-list__excerpt {
  font-family: var(--xingkai);
  font-size: 14px;
  line-height: 1.75;
}

/* ===================================================================
   EXPERIENCE
   =================================================================== */

.experience {
  margin: 0;
}

.experience__item {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  align-items: baseline;
  margin: 0 0 0.9rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--rule);
}

.experience__item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
  margin-bottom: 0;
}

.experience__item dt {
  flex: 1;
  font-family: var(--serif);
  font-size: 1rem;
  line-height: 1.4;
}

.experience__role {
  font-weight: 600;
  color: var(--ink);
}

.experience__org {
  color: var(--muted);
}

.experience__item dd {
  margin: 0;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.experience__cert,
.tag-link {
  font-family: var(--sans);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--muted-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  margin-left: 0.25em;
  transition:
    color 0.2s ease,
    border-color 0.2s ease;
  white-space: nowrap;
}

.experience__cert:hover,
.tag-link:hover {
  color: var(--accent);
  border-bottom-color: color-mix(in srgb, var(--accent) 55%, transparent);
}

/* ===================================================================
   OPEN-SOURCE LIST
   =================================================================== */

.oss-group {
  margin: 0 0 2.25rem;
}

.oss-group:last-child {
  margin-bottom: 0;
}

.oss-group__title {
  font-family: var(--sans);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted-2);
  margin: 0 0 1rem;
}

.oss-list {
  margin: 0;
}

.oss-item {
  display: flex;
  gap: 1.5rem;
  align-items: baseline;
  margin: 0 0 0.8rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--rule);
}

.oss-item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
  margin-bottom: 0;
}

.oss-item dt {
  flex: 0 0 10rem;
  margin: 0;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.45rem;
}

.oss-role {
  font-family: var(--sans);
  font-size: 9.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
}

.oss-role--contrib {
  color: var(--muted-2);
}

.oss-item dt a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition:
    color 0.2s ease,
    border-color 0.2s ease;
}

.oss-item dt a:hover {
  color: var(--accent);
  border-bottom-color: color-mix(in srgb, var(--accent) 55%, transparent);
}

.oss-item dd {
  margin: 0;
  flex: 1;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

/* Stacked layout on narrow screens */
@media (max-width: 640px) {
  .oss-item {
    flex-direction: column;
    gap: 0.25rem;
  }
  .oss-item dt {
    flex: 0 0 auto;
  }
  .oss-item dd {
    font-size: 14px;
  }
}

/* ===================================================================
   POST PAGES
   =================================================================== */

.page__hero--post {
  padding-top: 4rem;
  padding-bottom: 2.5rem;
}

.post-back {
  display: inline-block;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  margin-bottom: 1.75rem;
  transition: color 0.2s ease;
}

.post-back:hover {
  color: var(--accent);
}

.post-title {
  font-family: var(--display);
  font-weight: 600;
  font-size: 2rem;
  line-height: 1.2;
  letter-spacing: -0.012em;
  margin: 0 0 0.5rem;
  font-variation-settings: "opsz" 32;
}

.post-meta {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--muted);
  margin: 0;
}

.post-meta__authors {
  color: var(--ink);
}

.post-meta__authors a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  padding-bottom: 1px;
  transition:
    color 0.2s ease,
    border-color 0.2s ease;
}

.post-meta__authors a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.post-body {
  font-family: var(--serif);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink);
}

.post-body h2 {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.3rem;
  line-height: 1.3;
  margin: 2.4rem 0 1rem;
  scroll-margin-top: 1.5rem;
}

.post-body h3 {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.08rem;
  line-height: 1.35;
  margin: 1.65rem 0 0.55rem;
  scroll-margin-top: 1.5rem;
}

.post-body p {
  margin: 0 0 1.1rem;
}

.post-body a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 55%, transparent);
  text-underline-offset: 3px;
  transition:
    text-decoration-color 0.2s ease,
    color 0.2s ease;
}

.post-body a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

.post-body blockquote {
  border-left: 2px solid color-mix(in srgb, var(--accent) 40%, transparent);
  padding: 0.15rem 0 0.15rem 1.1rem;
  color: var(--muted);
  margin: 1.2rem 0;
  font-style: normal;
}

.post-body hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 2rem 0;
}

.post-body code {
  font-family: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;
  font-size: 0.88em;
  background: rgba(20, 20, 19, 0.05);
  padding: 0.12em 0.35em;
  border-radius: 3px;
}

.post-body pre {
  background: rgba(20, 20, 19, 0.04);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.55;
  margin: 1.25rem 0;
}

.post-body pre code {
  background: transparent;
  padding: 0;
  font-size: inherit;
}

.post-body figure {
  margin: 1.75rem auto;
  text-align: center;
}

.post-body figcaption {
  font-family: var(--sans);
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--muted);
  margin: 0.7rem auto 0;
  max-width: 85%;
  text-align: center;
}

.post-body img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Literature post bodies render in 楷体 (LXGW WenKai) — matches the typographic
   feel used in the homepage 文学 panel. */
.post-body--literature {
  font-family: var(--xingkai);
  line-height: 1.85;
}

/* Post cover image: opt-in via `cover:` in front matter. Sits flush at the
   top of the post body (no card chrome) and breaks slightly outside the body
   column on each side — a Thinking-Machines-style hero treatment that gives
   the cover more visual presence than an inline figure. */
.post-body > .post-cover {
  margin: 0 -3rem 2.25rem;
}

.post-body > .post-cover > img {
  background: transparent;
  padding: 0;
  border: 0;
  border-radius: 8px;
  width: 100%;
  height: auto;
  box-shadow:
    0 2px 8px rgba(20, 20, 19, 0.06),
    0 1px 2px rgba(20, 20, 19, 0.04);
  /* Enforce a uniform 16:9 hero box. Off-ratio sources are cropped via
     object-fit; object-position biases the crop toward the top so footer
     watermarks ("公众号 · 知陌若" etc.) get trimmed off the bottom. */
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: center 25%;
}

@media (max-width: 800px) {
  .post-body > .post-cover {
    margin-left: 0;
    margin-right: 0;
  }
}

/* Standalone images in markdown get wrapped in <p>. Treat those as figures:
   white card surface so screenshot whitespace blends in, rounded edges so the
   figure sits naturally on the cream page. */
.post-body p > img:only-child,
.post-body figure > img {
  background: #ffffff;
  padding: 0.9rem;
  border-radius: 6px;
  border: 1px solid var(--rule);
  box-shadow:
    0 2px 8px rgba(20, 20, 19, 0.05),
    0 1px 2px rgba(20, 20, 19, 0.04);
  box-sizing: border-box;
  margin: 0 auto;
}

.post-body p:has(> img:only-child) {
  text-align: center;
  margin: 1.75rem auto;
}

/* Editorial table — horizontal rules only, no vertical borders.
   Slight horizontal inset + extra vertical margin so the table reads
   as a distinct comparison panel separate from the body prose. */
.post-body table {
  width: 100%;
  max-width: calc(100% - 1.5rem);
  margin: 2.5rem auto;
  font-family: var(--sans);
  font-size: 0.88rem;
  line-height: 1.5;
  border-collapse: collapse;
}

.post-body thead tr {
  border-bottom: 1.5px solid var(--ink);
}

.post-body tbody tr {
  border-bottom: 1px solid var(--rule);
}

.post-body tbody tr:last-child {
  border-bottom: 1.5px solid var(--ink);
}

.post-body th,
.post-body td {
  padding: 0.8rem 0.8rem;
  text-align: left;
  border: 0;
  vertical-align: top;
}

/* Math inside table cells: shrink so equations fit in narrow columns
   without mid-equation line wraps. */
.post-body table .katex {
  font-size: 0.92em;
}

.post-body table td br + .katex,
.post-body table td .katex {
  display: inline-block;
}

.post-body th {
  font-weight: 500;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  background: transparent;
  padding-bottom: 0.55rem;
}

.post-body td:first-child {
  color: var(--ink);
}

.post-body td em {
  color: var(--muted);
  font-style: italic;
}

/* Yes/no markers tuned to palette (replaces ✅/❌) */
.post-body .yes,
.post-body .no {
  display: inline-block;
  font-weight: 600;
  font-size: 1.05em;
  line-height: 1;
  font-family: var(--sans);
}

.post-body .yes {
  color: var(--accent);
}

.post-body .no {
  color: var(--muted-2);
}

.post-body details {
  border-left: 2px solid var(--rule);
  padding: 0.4rem 1rem;
  margin: 1.2rem 0;
  color: var(--muted);
}

.post-body details summary {
  cursor: pointer;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--muted-2);
}

.post-body details[open] summary {
  margin-bottom: 0.6rem;
}

/* Margin notes (Tufte/TML-style): a side comment in the right gutter,
   anchored next to the paragraph where it appears. */
.post-body .margin-note {
  float: right;
  clear: right;
  width: var(--aside-width);
  margin-right: calc(-1 * (var(--aside-width) + var(--aside-gap)));
  margin-left: var(--aside-gap);
  margin-top: 0;
  margin-bottom: 1rem;
  font-family: var(--sans);
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--muted);
  text-align: left;
}

/* Literature posts: margin notes flow in 楷体 to match the body, slightly
   smaller than the tech-post sans default for a quieter scholarly feel. */
.post-body--literature .margin-note {
  font-family: var(--xingkai);
  font-size: 12px;
  line-height: 1.7;
}

.post-body .margin-note__label {
  display: block;
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--muted-2);
  margin-bottom: 0.45rem;
}

.post-body .margin-note .katex {
  font-size: 0.92em;
}

/* Inline marker that points to a margin note. Renders as a small coral
   superscript, like a Tufte-style sidenote number. */
.post-body .margin-marker {
  font-size: 0.7em;
  line-height: 0;
  vertical-align: super;
  margin-left: 0.05em;
}

.post-body .margin-marker a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: none;
  padding: 0 0.1em;
  font-weight: 500;
}

.post-body .margin-marker a:hover {
  color: var(--ink);
}

/* Highlight the margin note when navigated to via the marker */
.post-body .margin-note:target {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-radius: 3px;
  padding-left: 0.4rem;
  margin-left: calc(var(--aside-gap) - 0.4rem);
  transition: background 0.6s ease;
}

@media (max-width: 1100px) {
  .post-body .margin-note {
    display: block;
    float: none;
    width: auto;
    margin: 1rem 0;
    padding: 0.9rem 1.1rem;
    background: var(--aside-bg);
    border-left: 2px solid color-mix(in srgb, var(--accent) 35%, transparent);
    border-radius: 2px;
  }
}

/* Classical prose block (e.g. 燋食): unpunctuated 古散文 rendered in 楷体 with
   ideographic spaces between phrases. Slightly larger and looser than regular
   body text for breathing room and an ink-on-paper feel. */
.post-body .prose-classical {
  margin: 2.5rem 0;
  font-family: var(--xingkai);
  font-size: 17px;
  line-height: 2.1;
  text-align: justify;
}

.post-body .prose-classical p {
  margin: 0 0 1.5em;
  text-indent: 0;
}

.post-body .prose-classical p:last-child {
  margin-bottom: 0;
}

/* The original handwritten scan, kept as a manuscript artifact above the
   typed prose. Centered, modest in width so it sits as an artifact rather
   than dominating the page. */
.post-body .prose-classical__scan {
  margin: 0 auto 2.5rem;
  max-width: 480px;
  text-align: center;
}

.post-body .prose-classical__scan figcaption {
  margin-top: 0.6rem;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-2);
}

/* Classical poem block (e.g. 春折): a centered "stele" of 楷体 with generous
   breathing room. Margin notes attached to individual lines pin the
   commentary into the right gutter on desktop. */
.post-body .poem {
  margin: 3rem 0 1.5rem;
  text-align: center;
  font-family: var(--xingkai);
  font-size: 1.3rem;
  line-height: 2.4;
  letter-spacing: 0.22em;
  color: var(--ink);
}

.post-body .poem .poem__line {
  position: relative;
  margin: 0;
  font-size: inherit;
  line-height: inherit;
}

/* Markers on poem lines: zero-width inline-block so they render at their
   normal superscript position but don't widen the line — keeps the Chinese
   characters centered identically across all lines (with or without notes). */
.post-body .poem .margin-marker {
  display: inline-block;
  width: 0;
  overflow: visible;
}

.post-body .poem-coda {
  margin: 2rem auto 0;
  max-width: 28em;
  text-align: center;
  font-family: var(--xingkai);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--muted);
  letter-spacing: 0.05em;
}

.post-body .poem-attribution {
  margin: 1.5rem 0 0;
  text-align: center;
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted-2);
}

/* Footnotes (markdown's footnotes extension renders them in .footnote at end of body). */
.post-body .footnote {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-size: 0.88rem;
  color: var(--muted);
}

.post-body .footnote hr {
  display: none;
}

.post-body .footnote ol {
  padding-left: 1.25rem;
  margin: 0;
}

.post-body .footnote li {
  margin-bottom: 0.5rem;
  scroll-margin-top: 1.5rem;
}

.post-body .footnote li:target {
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border-radius: 3px;
  padding-left: 0.4rem;
  margin-left: -0.4rem;
  transition: background 0.6s ease;
}

.post-body sup.footnote-ref a,
.post-body a.footnote-ref {
  font-size: 0.75em;
  text-decoration: none;
  color: var(--accent);
  border-bottom: none;
  padding: 0 0.1em;
}

.post-body a.footnote-backref {
  text-decoration: none;
  color: var(--muted-2);
  border-bottom: none;
  margin-left: 0.3em;
}

.post-body a.footnote-backref:hover {
  color: var(--accent);
}

/* Reference list at the bottom of posts. Each item is anchor-linkable from
   inline [N] citations. */
.post-body .references {
  list-style: none;
  padding: 0;
  margin: 1.25rem 0;
  font-size: 0.94rem;
  line-height: 1.5;
  color: var(--muted);
}

.post-body .references li {
  margin: 0 0 0.55rem;
  padding-left: 1.6rem;
  text-indent: -1.6rem; /* hanging indent: [N] sits at the left edge */
  scroll-margin-top: 1.5rem; /* anchor-jump offset */
}

.post-body .references li:target {
  /* subtle flash when arrived via anchor */
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border-radius: 3px;
  padding-left: 1.6rem;
  margin-left: -0.35rem;
  padding-right: 0.35rem;
  transition: background 0.6s ease;
}

/* Definition-list for method / variant summaries (e.g. optimizer table replacement).
   Each method gets its name on one line and a full-width math + comment below. */
.post-body .method-list {
  margin: 1.75rem 0;
}

.post-body .method-list dt {
  font-family: var(--serif);
  font-size: 1rem;
  color: var(--ink);
  margin: 1.5rem 0 0.35rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule);
}

.post-body .method-list dt:first-child {
  margin-top: 0;
}

.post-body .method-list dt em {
  color: var(--muted);
  font-style: italic;
  font-weight: 400;
}

.post-body .method-list dd {
  margin: 0 0 0.5rem;
}

.post-body .method-list dd p:last-of-type {
  color: var(--muted);
  font-size: 0.94rem;
  font-style: italic;
  margin-top: 0.5rem;
  margin-bottom: 0;
}

.post-body .method-list .katex-display {
  margin: 0.7rem 0;
}

/* Long display equations: scroll within the column rather than pushing the
   page sideways. overflow-y: hidden suppresses the phantom vertical bar
   KaTeX's descenders can trigger. Scrollbar styled to match the site theme
   (mirrors .post-list-scroll). */
.post-body .katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.25rem 0 0.5rem;
  scrollbar-width: thin;
  scrollbar-color: var(--rule) transparent;
}

.post-body .katex-display::-webkit-scrollbar {
  height: 6px;
}
.post-body .katex-display::-webkit-scrollbar-track {
  background: transparent;
}
.post-body .katex-display::-webkit-scrollbar-thumb {
  background: var(--rule);
  border-radius: 3px;
}
.post-body .katex-display::-webkit-scrollbar-thumb:hover {
  background: var(--muted-2);
}

/* Post-level aside: floats into the right gutter (like section__aside but for posts) */
.post-aside {
  float: right;
  clear: right;
  width: var(--aside-width);
  margin-right: calc(-1 * (var(--aside-width) + var(--aside-gap)));
  margin-left: var(--aside-gap);
  margin-top: 0.4rem;
  margin-bottom: 1.5rem;
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.post-aside h3 {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--muted-2);
  margin: 0 0 0.75rem;
}

.post-aside ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.post-aside li {
  margin: 0 0 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.post-aside .favicon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  border-radius: 2px;
}

.post-aside a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition:
    color 0.2s ease,
    border-color 0.2s ease;
  min-width: 0;
}

.post-aside a:hover {
  color: var(--accent);
  border-bottom-color: color-mix(in srgb, var(--accent) 50%, transparent);
}

@media (max-width: 1100px) {
  .post-aside {
    float: none;
    width: auto;
    margin: 0 0 1.75rem;
    padding: 0.9rem 1.1rem;
    background: var(--aside-bg);
    border-left: 2px solid color-mix(in srgb, var(--accent) 35%, transparent);
    border-radius: 2px;
  }
}

/* Pure typographic lede / abstract — no box, no border, just bigger serif with breathing room. */
.post-body .post-lede {
  font-family: var(--serif);
  font-size: 1.08rem;
  line-height: 1.65;
  color: var(--ink);
  margin: 1.5rem 0 2.25rem;
  font-variation-settings: "opsz" 17;
}

.post-body .post-lede strong {
  font-weight: 600;
}

@media (max-width: 1100px) {
  .post-title {
    font-size: 1.85rem;
  }
  .post-body {
    font-size: 1rem;
  }
}

/* ===================================================================
   PAGE FOOTER
   =================================================================== */

.page-footer {
  max-width: var(--content-width);
  margin: 5rem auto 0;
  padding: 1.5rem 1.6rem 0;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 12.5px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}

.page-footer__views {
  color: var(--muted-2);
}

/* ===================================================================
   POST COMMENTS (giscus)
   =================================================================== */

.post-comments {
  margin-top: 4.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--rule);
}

.post-comments__title {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1.5rem;
}

.page-footer__views a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-footer__views a:hover {
  color: var(--ink);
  border-bottom-color: color-mix(in srgb, var(--accent) 50%, transparent);
}

/* ===================================================================
   RESPONSIVE: collapse below 1100px
   =================================================================== */

@media (max-width: 1100px) {
  .page__shell {
    grid-template-columns: 1fr;
    max-width: var(--content-width);
    padding: 0 1.25rem;
  }

  .left-toc {
    display: none;
  }

  .content {
    grid-column: 1;
  }

  .section__aside {
    float: none;
    width: auto;
    margin: 0 0 1.5rem;
    padding: 1rem 1.1rem;
    background: var(--aside-bg);
    border-left: 2px solid color-mix(in srgb, var(--accent) 35%, transparent);
    border-radius: 2px;
  }

  /* On mobile, float the portrait left so it sits beside the link list */
  .aside-portrait {
    float: left;
    width: 110px;
    margin: 0.1rem 1rem 0.5rem 0;
  }

  /* Clear the float after the icon list ends */
  .icon-list {
    overflow: hidden;
  }

  .page-footer {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }
}

@media (max-width: 640px) {
  .page__hero {
    padding: 3.5rem 1.25rem 2rem;
  }
  .hero__name {
    font-size: 1.7rem;
  }
  .section {
    margin-bottom: 3rem;
  }
  .post-list a {
    flex-direction: column;
    gap: 0.2rem;
  }
}