/* Huang Kun's personal blog: night photography, quiet typography, and a journal index. */
:root {
  --lab-ink: #28343a;
  --lab-muted: #657077;
  --lab-line: #ddd6c9;
  --lab-surface: #fffdfa;
  --lab-soft: #f5f1e8;
  --lab-accent: #2b7778;
  --lab-copper: #995f45;
  --lab-shadow: 0 13px 34px rgba(30, 39, 43, .065);
  --lab-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --lab-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}
html[data-user-color-scheme="dark"] {
  --lab-ink: #eae4d8;
  --lab-muted: #b7bdbb;
  --lab-line: #3b474b;
  --lab-surface: #222d33;
  --lab-soft: #172129;
  --lab-accent: #8fc5bf;
  --lab-copper: #dea586;
  --lab-shadow: 0 13px 34px rgba(0, 0, 0, .16);
}

html { scroll-behavior: smooth; }
body { font-family: var(--lab-sans); }
a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 2px solid var(--lab-accent);
  outline-offset: 3px;
}
.lab-skip-link {
  position: fixed; z-index: 1100; top: -5rem; left: 1rem;
  padding: .65rem 1rem; color: #192631; background: #f5f1e8;
  border: 2px solid #2b7778; border-radius: 2px;
}
.lab-skip-link:focus { top: 1rem; }

/* Navigation and the original Hefei Swan Lake photograph. */
#navbar {
  background: #192631;
  box-shadow: 0 1px 0 rgba(238, 232, 219, .13);
}
#navbar .navbar-brand strong {
  font: 600 1.08rem/1.4 var(--lab-serif);
  letter-spacing: .08em;
}
#navbar .nav-link { font-size: .91rem; font-weight: 500; letter-spacing: .035em; }
#navbar .nav-link:hover, #navbar .nav-link:focus-visible { color: #d6e6df; }
.lab-header-home { height: auto !important; max-height: none !important; padding-top: 64px; }
#banner.lab-banner-home { height: auto; background: #192631; }
.lab-home-photo { display: block; width: 100%; height: auto; }
#banner.lab-banner-inner .mask {
  background: linear-gradient(90deg, rgba(16, 25, 30, .65), rgba(16, 25, 30, .37)) !important;
}
#banner.lab-banner-inner .banner-text { max-width: 900px; }
#banner.lab-banner-inner #subtitle { font-family: var(--lab-serif); font-weight: 600; letter-spacing: .035em; }
#board { border-radius: 2px; box-shadow: var(--lab-shadow); }
#board.lab-board-home { margin-top: 0; padding-top: 0; }

/* Personal introduction and article-first home. */
.lab-home, .lab-research-page { color: var(--lab-ink); }
.lab-signature { padding: 3.3rem 0 2.6rem; border-bottom: 1px solid var(--lab-line); text-align: center; }
.lab-signature-text { display: inline-block; margin: 0; color: var(--lab-ink); font: 400 clamp(1.2rem, 2.5vw, 1.8rem)/1.7 var(--lab-serif); letter-spacing: .15em; }
.lab-eyebrow {
  margin: 0 0 1rem; color: var(--lab-accent);
  font-size: .72rem; font-weight: 600; letter-spacing: .14em;
}
.lab-eyebrow span { padding: 0 .3rem; color: var(--lab-muted); }
.lab-introduction {
  display: grid; grid-template-columns: minmax(0, 1fr) 160px;
  gap: clamp(2rem, 7vw, 6rem); align-items: center;
  padding: 2.5rem 0 2.8rem; border-bottom: 1px solid var(--lab-line);
}
.lab-intro-copy h2, .lab-section-heading h2, .lab-research-intro h1 {
  font-family: var(--lab-serif); font-weight: 600; letter-spacing: .04em;
}
.lab-intro-copy h2 { margin: .3rem 0 1rem; color: var(--lab-ink); font-size: clamp(2rem, 4vw, 3rem); }
.lab-intro-copy > p:not(.lab-eyebrow) { max-width: 650px; color: var(--lab-muted); font-size: 1rem; line-height: 1.95; }
.lab-intro-copy .lab-personal-tags { margin-top: 1.3rem; color: var(--lab-ink) !important; font-size: .84rem !important; letter-spacing: .05em; }
.lab-personal-tags span { padding: 0 .35rem; color: var(--lab-accent); }
.lab-intro-portrait { display: block; justify-self: end; width: 160px; color: var(--lab-accent); text-align: right; font-size: .82rem; }
.lab-intro-portrait img {
  display: block; width: 160px; height: 160px; margin-bottom: .8rem;
  border: 5px solid var(--lab-surface); border-radius: 50%; object-fit: cover;
  object-position: 63% center; box-shadow: 0 10px 25px rgba(31, 41, 42, .14);
}
.lab-intro-portrait:hover { color: var(--lab-copper); text-decoration: none; }
.lab-editorial-grid { display: grid; grid-template-columns: minmax(0, 1fr) 236px; gap: clamp(2.5rem, 5vw, 4.5rem); padding: 3.2rem 0 3.7rem; }
.lab-home-archive .lab-editorial-grid { display: block; max-width: 920px; margin: auto; }
.lab-section-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; margin-bottom: 1.8rem; }
.lab-section-heading h2 { margin: 0 0 .5rem; color: var(--lab-ink); font-size: clamp(1.9rem, 3.4vw, 2.55rem); line-height: 1.3; }
.lab-section-heading p:last-child { margin: 0; color: var(--lab-muted); font-size: .91rem; line-height: 1.75; }
.lab-text-link, .lab-entry-link {
  color: var(--lab-accent); font-size: .86rem; font-weight: 500; text-decoration: none;
}
.lab-text-link:hover, .lab-entry-link:hover { color: var(--lab-copper); text-decoration: underline; }
.lab-article-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--lab-line); }
.lab-article-list > li { border-bottom: 1px solid var(--lab-line); }
.lab-article-entry { display: grid; grid-template-columns: 102px minmax(0, 1fr); gap: 1.5rem; padding: 1.9rem 0 2rem; }
.lab-article-date { padding-top: .38rem; color: var(--lab-accent); font: .78rem/1.5 Georgia, serif; white-space: nowrap; }
.lab-article-copy h3 { margin: 0 0 .85rem; font: 600 1.48rem/1.55 var(--lab-serif); overflow-wrap: anywhere; }
.lab-article-list > li:first-child .lab-article-copy h3 { font-size: clamp(1.55rem, 2.3vw, 1.76rem); }
.lab-article-copy h3 a { color: var(--lab-ink); text-decoration: none; }
.lab-article-copy h3 a:hover { color: var(--lab-accent); }
.lab-article-copy p { margin: 0 0 .95rem; color: var(--lab-muted); font-size: .9rem; line-height: 1.82; }
.lab-side-notes { padding-top: .2rem; }
.lab-side-note { padding: 0 0 2rem 1.3rem; border-left: 1px solid var(--lab-line); }
.lab-side-note nav a { display: flex; justify-content: space-between; gap: 1rem; padding: .85rem 0; border-top: 1px solid var(--lab-line); color: var(--lab-ink); font: 600 1.03rem/1.6 var(--lab-serif); }
.lab-side-note nav a:last-child { border-bottom: 1px solid var(--lab-line); }
.lab-side-note nav a:hover { color: var(--lab-accent); text-decoration: none; }
.lab-side-note nav a span:last-child { color: var(--lab-accent); font: .9rem/1.8 var(--lab-sans); }

/* Works and moments are small, personal collections. */
.lab-curated-page { max-width: 820px; margin: 0 auto; padding: .8rem 0 2.5rem; color: var(--lab-ink); }
.lab-page-lede { margin: 0 0 2.4rem; color: var(--lab-muted); font: 400 clamp(1.1rem, 2vw, 1.3rem)/1.9 var(--lab-serif); }
.lab-work-list, .lab-tools-list { list-style: none; padding: 0; }
.lab-work-list { margin: 0 0 3.5rem; border-top: 1px solid var(--lab-line); }
.lab-work-list li { padding: 1.6rem 0 1.8rem; border-bottom: 1px solid var(--lab-line); }
.lab-work-list li > span { color: var(--lab-accent); font-size: .8rem; letter-spacing: .04em; }
.lab-work-list h2 { margin: .45rem 0 .55rem; color: var(--lab-ink); font: 600 1.45rem/1.5 var(--lab-serif); }
.lab-work-list p { margin: 0 0 .7rem; color: var(--lab-muted); line-height: 1.8; }
.lab-work-list a, .lab-tools-list a { color: var(--lab-accent); font-size: .9rem; }
.lab-works-subtitle { margin: 0 0 1rem; color: var(--lab-ink); font: 600 1.45rem/1.5 var(--lab-serif); }
.lab-tools-list { margin: 0; border-top: 1px solid var(--lab-line); }
.lab-tools-list li { display: flex; justify-content: space-between; gap: 1.5rem; padding: 1rem 0; border-bottom: 1px solid var(--lab-line); }
.lab-tools-list li span { color: var(--lab-muted); font-size: .88rem; text-align: right; }
.lab-moment { margin: 0; }
.lab-moment img { display: block; width: 100%; height: auto; }
.lab-moment figcaption { padding: .75rem 0; color: var(--lab-muted); font: .9rem/1.7 var(--lab-serif); }

/* The official NetEase player handles the song and its single-track repeat. */
.lab-music {
  position: fixed; z-index: 1050; top: 0; left: 50%;
  width: 40px; transform: translateX(-50%);
}
.lab-music details { width: 40px; }
.lab-music summary {
  display: flex; align-items: center; justify-content: center;
  width: 40px; height: 64px; cursor: pointer; list-style: none;
}
.lab-music summary::-webkit-details-marker { display: none; }
.lab-music summary:focus-visible { outline: 2px solid var(--lab-accent); outline-offset: 2px; }
.lab-music-note { color: #a9dad1; font-size: 1.3rem; line-height: 1; }
.lab-music details[open] .lab-music-note { color: #fff; }
.lab-music iframe {
  display: block; position: absolute; top: 64px; left: 50%;
  width: min(340px, calc(100vw - 1.5rem)); height: 86px;
  transform: translateX(-50%); border: 1px solid var(--lab-line);
  background: #fff; box-shadow: var(--lab-shadow);
}

/* Publications are a separate, factual index. */
.lab-research-intro { max-width: 790px; padding: .9rem 0 2.3rem; }
.lab-research-intro h1 { margin: 0 0 .8rem; color: var(--lab-ink); font-size: clamp(2.1rem, 4vw, 3.1rem); }
.lab-research-intro > p:last-child { color: var(--lab-muted); line-height: 1.9; }
.lab-section { padding: 1.4rem 0 2.8rem; }
.lab-count { color: var(--lab-muted); font-size: .84rem; }
.lab-research-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--lab-line); }
.lab-research-item { display: grid; grid-template-columns: 3rem minmax(0, 1fr); gap: 1rem; padding: 1.4rem .25rem; border-bottom: 1px solid var(--lab-line); }
.lab-research-number { color: var(--lab-accent); font: 1rem/1.6 Georgia, serif; }
.lab-research-item h3 { margin: 0 0 .45rem; color: var(--lab-ink); font: 600 1.15rem/1.65 var(--lab-serif); overflow-wrap: anywhere; }
.lab-research-item p { margin: 0; color: var(--lab-muted); font-size: .86rem; line-height: 1.7; }
.lab-research-item .lab-research-authors { margin-top: .4rem; font-size: .78rem; }
.lab-research-item .lab-text-link { display: inline-block; margin-top: .5rem; font-size: .82rem; }
.lab-research-footnote { padding-top: 1.2rem; border-top: 1px solid var(--lab-line); color: var(--lab-muted); line-height: 1.8; }

/* Article pages stay calm even with equations, code, and wide tables. */
.post-content .markdown-body, .about-content .markdown-body, .page-content .markdown-body {
  color: var(--lab-ink); background-color: transparent;
}
.post-content { max-width: 900px; padding-right: clamp(1.25rem, 6vw, 5rem); padding-left: clamp(1.25rem, 6vw, 5rem); }
.post-content .markdown-body { font-family: var(--lab-sans); font-size: 1.06rem; line-height: 1.87; overflow-wrap: anywhere; }
.post-content .markdown-body p, .about-content .markdown-body p { line-height: 1.87; }
.post-content .markdown-body h2, .post-content .markdown-body h3 { scroll-margin-top: 5rem; font-family: var(--lab-serif); font-weight: 600; line-height: 1.5; }
.post-content .markdown-body h2 { margin-top: 2.2em; padding-bottom: .35em; border-bottom: 1px solid var(--lab-line); }
.post-content .markdown-body h3 { margin-top: 1.8em; }
.post-content .markdown-body table, .post-content .markdown-body pre,
.post-content .markdown-body .katex-display, .post-content .markdown-body .MathJax_Display { display: block; max-width: 100%; overflow-x: auto; }
.post-content .markdown-body pre { font-family: Consolas, Menlo, monospace; font-size: .9rem !important; line-height: 1.65; }
.post-content .markdown-body .note-primary { background: var(--lab-soft); border-left-color: var(--lab-copper); }
.post-content .markdown-body blockquote, .about-content .markdown-body blockquote { padding-left: 1rem; border-left: 2px solid var(--lab-copper); }
.post-content .markdown-body img { height: auto; }
.toc-body { max-height: calc(100vh - 8rem); }
.tocbot-active-link { color: var(--lab-accent) !important; }
.about-avatar img { width: 126px; height: 126px; border-radius: 50%; object-fit: cover; object-position: 63% center; }
.about-content { max-width: 820px; margin-right: auto; margin-left: auto; line-height: 1.87; }

/* The CV keeps its own layout but uses the blog's calmer palette. */
.cv-hero { border-color: rgba(238, 232, 219, .25); border-radius: 2px; background: linear-gradient(120deg, rgba(20, 31, 39, .89), rgba(42, 62, 62, .77)), url('/myblog/img/swan_lake.jpg') center 54% / cover; box-shadow: none; }
.cv-hero::after { display: none; }
.cv-hero h1 { font-family: var(--lab-serif); font-weight: 600; }

@media (max-width: 991px) {
  .lab-editorial-grid { grid-template-columns: minmax(0, 1fr) 210px; gap: 2rem; }
  .lab-article-entry { grid-template-columns: 85px minmax(0, 1fr); gap: 1.15rem; }
}
@media (max-width: 900px) {
  .lab-editorial-grid { grid-template-columns: 1fr; }
  .lab-side-notes { max-width: 420px; }
}
@media (max-width: 767px) {
  .lab-introduction { grid-template-columns: 1fr; gap: 1.5rem; padding: 1.5rem 0 2.3rem; }
  .lab-intro-portrait { display: flex; align-items: center; gap: 1rem; justify-self: start; width: auto; text-align: left; }
  .lab-intro-portrait img { width: 86px; height: 86px; margin: 0; border-width: 3px; }
  .lab-editorial-grid { grid-template-columns: 1fr; gap: 2.3rem; padding-top: 2.6rem; }
  .post-content { padding-right: 1.5rem; padding-left: 1.5rem; }
}
@media (max-width: 640px) {
  .lab-music summary { height: 50px; }
  .lab-music iframe { top: 50px; width: min(320px, calc(100vw - 1.5rem)); }
  .lab-header-home { padding-top: 50px; }
  .lab-signature { padding: 2rem .7rem 1.7rem; }
  .lab-signature-text { font-size: 1.14rem; letter-spacing: .08em; }
  .lab-intro-copy h2 { font-size: 2.1rem; }
  .lab-section-heading { align-items: start; flex-direction: column; gap: .6rem; }
  .lab-article-entry { grid-template-columns: 1fr; gap: .45rem; padding: 1.6rem 0; }
  .lab-article-date { padding-top: 0; }
  .lab-article-copy h3, .lab-article-list > li:first-child .lab-article-copy h3 { font-size: 1.42rem; }
  .lab-side-note { padding-left: 1.1rem; }
  .lab-tools-list li { display: block; }
  .lab-tools-list li span { display: block; margin-top: .25rem; text-align: left; }
  .lab-research-item { grid-template-columns: 2rem minmax(0, 1fr); gap: .65rem; }
  .post-content { padding-right: 1rem; padding-left: 1rem; }
  .post-content .markdown-body { font-size: 1rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .fade-in-up { animation: none !important; }
}