/* ============================================================
   Fonts（本地托管，不依赖外部 CDN）
   ============================================================ */
@font-face { font-family: "Space Grotesk"; font-style: normal; font-weight: 400; font-display: swap; src: url(/assets/fonts/space-grotesk/space-grotesk-latin-400-normal.woff2) format("woff2"); }
@font-face { font-family: "Space Grotesk"; font-style: normal; font-weight: 500; font-display: swap; src: url(/assets/fonts/space-grotesk/space-grotesk-latin-500-normal.woff2) format("woff2"); }
@font-face { font-family: "Space Grotesk"; font-style: normal; font-weight: 600; font-display: swap; src: url(/assets/fonts/space-grotesk/space-grotesk-latin-600-normal.woff2) format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url(/assets/fonts/jetbrains-mono/jetbrains-mono-latin-400-normal.woff2) format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 500; font-display: swap; src: url(/assets/fonts/jetbrains-mono/jetbrains-mono-latin-500-normal.woff2) format("woff2"); }

/* ============================================================
   Design tokens
   ============================================================ */
:root {
  --font-sans: "Space Grotesk", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Noto Sans SC", ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-mono: "JetBrains Mono", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --background: #f5f5f5;
  --foreground: #0c0a09;
  --card: #ffffff;
  --secondary: #f0efed;
  --muted-foreground: #777169;
  --faint: #a8a29e;
  --border: #e7e5e4;
  --hairline-strong: #d6d3d1;
  --content: #3f3d3a;
  --accent: #b45309;
  --link-wave: #777169;
  --sparkle: #a8a29e;
  --selection: #fde68a;
  --shadow-sm: 0 1px 2px rgb(12 10 9 / 0.04), 0 1px 3px rgb(12 10 9 / 0.03);
  --shadow-md: 0 6px 20px -6px rgb(12 10 9 / 0.12), 0 2px 6px rgb(12 10 9 / 0.04);
  --header-bg: rgb(245 245 245 / 0.85);

  --code-bg: #fbf1c7;
  --code-fg: #504945;
  --code-bar: #f2e5bc;
  --code-muted: #7c6f64;
  --hl-red: #9d0006;
  --hl-green: #79740e;
  --hl-yellow: #b57614;
  --hl-blue: #076678;
  --hl-purple: #8f3f71;
  --hl-aqua: #427b58;
  --hl-orange: #af3a03;
  --hl-gray: #928374;

  --wave-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 6'%3E%3Cpath d='M0 3 Q5 0 10 3 T20 3' fill='none' stroke='%23a8a29e' stroke-width='2'/%3E%3C/svg%3E");

  --radius: 1rem;
  --header-h: 4rem;
  color-scheme: light;
}

[data-theme="dark"] {
  --background: #0c0a09;
  --foreground: #f5f5f4;
  --card: #1c1917;
  --secondary: #292524;
  --muted-foreground: #a8a29e;
  --faint: #78716c;
  --border: #2a2624;
  --hairline-strong: #44403c;
  --content: #d6d3d1;
  --accent: #ffcc00;
  --link-wave: #ffcc00;
  --sparkle: #ffcc00;
  --selection: #854d0e;
  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.3);
  --shadow-md: 0 10px 30px -10px rgb(0 0 0 / 0.6);
  --header-bg: rgb(12 10 9 / 0.8);

  --code-bg: #151210;
  --code-fg: #d5c4a1;
  --code-bar: #1f1a17;
  --code-muted: #a89984;
  --hl-red: #fb4934;
  --hl-green: #b8bb26;
  --hl-yellow: #fabd2f;
  --hl-blue: #83a598;
  --hl-purple: #d3869b;
  --hl-aqua: #8ec07c;
  --hl-orange: #fe8019;
  --hl-gray: #928374;

  --wave-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 6'%3E%3Cpath d='M0 3 Q5 0 10 3 T20 3' fill='none' stroke='%23ffcc00' stroke-width='2'/%3E%3C/svg%3E");
  color-scheme: dark;
}

/* ============================================================
   Base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 1rem); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--foreground);
  background: var(--background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color .2s ease;
}
::selection { background: var(--selection); }
a { color: inherit; text-decoration: none; }
img, svg { vertical-align: middle; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

.page { flex: 1; display: flex; flex-direction: column; padding-top: var(--header-h); }
.container { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 1.25rem 4rem; flex: 1; }
.container--post { max-width: 920px; padding-top: 1.5rem; }
.container--narrow { max-width: 760px; }
@media (min-width: 768px) {
  .container { padding-left: 1.5rem; padding-right: 1.5rem; }
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  height: var(--header-h);
  background: var(--header-bg);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-header__inner {
  max-width: 1200px; height: 100%; margin: 0 auto; padding: 0 1.25rem;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
}
.brand { display: flex; align-items: center; gap: .625rem; flex-shrink: 0; color: var(--foreground); }
.brand__logo { width: 28px; height: 28px; transition: transform .3s ease; }
.brand:hover .brand__logo { transform: rotate(-8deg); }
.brand__name { font-size: 1.125rem; font-weight: 500; letter-spacing: -.02em; }

.site-nav { display: flex; align-items: center; gap: .125rem; min-width: 0; }
.site-nav__link {
  font-size: .9375rem; font-weight: 500; color: var(--muted-foreground);
  padding: .375rem .75rem; border-radius: 999px; white-space: nowrap;
  transition: color .15s, background-color .15s;
}
.site-nav__link:hover { color: var(--foreground); background: var(--secondary); }
[data-theme="dark"] .site-nav__link:hover { color: var(--link-wave); background: transparent; }
.site-nav__link.is-active { color: var(--foreground); }
.site-nav__link.is-active { background-image: var(--wave-image); background-repeat: repeat-x; background-size: 16px 5px; background-position: 50% calc(100% - 2px); padding-bottom: .5rem; }
.site-nav__sep { width: 1px; height: 1rem; background: var(--border); margin: 0 .375rem; }
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 2.25rem; height: 2.25rem; border-radius: 999px; border: 0; background: transparent;
  color: var(--muted-foreground); cursor: pointer; transition: color .15s, background-color .15s;
}
.icon-btn:hover { color: var(--foreground); background: var(--secondary); }
[data-theme="dark"] .icon-btn:hover { color: var(--link-wave); }
.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: inline; }

@media (max-width: 560px) {
  .site-header__inner { padding: 0 .75rem 0 1rem; }
  .brand__name { display: none; }
  .site-nav__link { padding: .375rem .5rem; font-size: .875rem; }
  .site-nav__sep { display: none; }
}

/* ============================================================
   Sparkles（标题区域的点点星光）
   ============================================================ */
.sparkle-field { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.sparkle, .sparkle-dot, .sparkle-trail {
  position: absolute; display: block; width: var(--s); height: var(--s);
  background: var(--sparkle); opacity: 0;
  animation: twinkle var(--d, 3s) ease-in-out var(--delay, 0s) infinite;
}
.sparkle, .sparkle-trail {
  clip-path: polygon(50% 0, 60% 40%, 100% 50%, 60% 60%, 50% 100%, 40% 60%, 0 50%, 40% 40%);
}
.sparkle-dot { border-radius: 50%; }
@keyframes twinkle {
  0%, 100% { opacity: 0; transform: scale(.3) rotate(0deg); }
  50% { opacity: .85; transform: scale(1) rotate(45deg); }
}
.sparkle-trail { animation: trail .9s ease-out forwards; }
@keyframes trail {
  0% { opacity: .9; transform: translateY(0) scale(1) rotate(0); }
  100% { opacity: 0; transform: translateY(14px) scale(.2) rotate(90deg); }
}

/* ============================================================
   Hero / page heads
   ============================================================ */
.hero, .page-head, .post-head { position: relative; overflow: hidden; text-align: center; }
.hero__inner, .page-head__inner, .post-head__inner { position: relative; z-index: 1; }
.hero__inner { max-width: 1080px; margin: 0 auto; padding: 3.5rem 1.25rem 2rem; }
.hero__title { margin: 0; font-size: 2.25rem; font-weight: 500; letter-spacing: -.025em; line-height: 1.15; }
.hero__keywords {
  margin: 1rem 0 0; display: flex; flex-wrap: wrap; justify-content: center; gap: .375rem .75rem;
  font-size: 1rem; color: var(--muted-foreground);
}
.hero__keywords .dot { color: var(--faint); opacity: .6; user-select: none; }
.hero__tagline { margin: 1rem auto 0; max-width: 40rem; font-size: 1rem; line-height: 1.7; letter-spacing: .04em; color: var(--muted-foreground); text-wrap: balance; }
@media (min-width: 768px) {
  .hero__inner { padding: 5rem 1.5rem 3rem; }
  .hero__title { font-size: 3rem; }
  .hero__keywords, .hero__tagline { font-size: 1.125rem; }
}

.page-head__inner { max-width: 1080px; margin: 0 auto; padding: 3rem 1.25rem 2rem; }
.page-head--compact .page-head__inner, .page-head--compact { padding-top: 1rem; }
.page-head__title { margin: 0; font-size: 1.875rem; font-weight: 500; letter-spacing: -.025em; }
.page-head__sub { margin: .75rem 0 0; font-family: var(--font-mono); font-size: .8125rem; color: var(--muted-foreground); }
@media (min-width: 768px) {
  .page-head__inner { padding: 4rem 1.5rem 2.5rem; }
  .page-head__title { font-size: 2.25rem; }
}
.page-head--error .page-head__inner { padding-top: 6rem; padding-bottom: 6rem; }
.error-code { margin: 0 0 .5rem; font-family: var(--font-mono); font-size: .875rem; color: var(--muted-foreground); letter-spacing: .2em; }
.error-actions { margin-top: 2rem; display: flex; gap: .75rem; justify-content: center; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: .375rem; height: 2.5rem; padding: 0 1.25rem;
  border-radius: 999px; font-size: .875rem; font-weight: 500; border: 1px solid transparent;
  background: var(--foreground); color: var(--background); cursor: pointer;
  transition: transform .15s, background-color .15s, opacity .15s;
}
.btn:hover { opacity: .88; }
.btn:active { transform: translateY(1px); }
.btn--ghost { background: transparent; color: var(--foreground); border-color: var(--hairline-strong); }
.btn--ghost:hover { background: var(--secondary); opacity: 1; }

/* ============================================================
   首页文章卡片
   ============================================================ */
.post-grid { display: grid; grid-template-columns: 1fr; gap: 1.25rem; }
@media (min-width: 768px) { .post-grid { grid-template-columns: 1fr 1fr; gap: 1.5rem; } }

.post-card {
  position: relative; display: flex; flex-direction: column;
  padding: 1.5rem; border-radius: var(--radius);
  background: var(--card); border: 1px solid var(--border); box-shadow: var(--shadow-sm);
  transition: transform .2s ease-out, box-shadow .2s ease-out, border-color .2s ease-out;
}
.post-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); border-color: var(--hairline-strong); }
.post-card__title { margin: 0; font-size: 1.25rem; font-weight: 500; line-height: 1.4; letter-spacing: -.015em; }
.post-card__title a::after { content: ""; position: absolute; inset: 0; border-radius: var(--radius); }
.post-card__meta {
  margin-top: .75rem; display: flex; flex-wrap: wrap; align-items: center; gap: .25rem .625rem;
  font-family: var(--font-mono); font-size: .75rem; color: var(--muted-foreground);
}
.post-card__stats { display: none; gap: .625rem; }
.post-card__stats .sep { color: var(--faint); opacity: .6; margin-right: .625rem; }
@media (min-width: 480px) { .post-card__stats { display: inline; } }
.post-card__summary {
  margin: .875rem 0 0; font-size: .9375rem; line-height: 1.7; color: var(--muted-foreground);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.post-card__summary .katex { font-size: 1.04em; }
[data-theme="dark"] .post-card:hover .post-card__title { color: var(--link-wave); }
@media (min-width: 768px) {
  .post-card { padding: 1.75rem; }
  .post-card__title { font-size: 1.5rem; }
}

.post-card--featured { grid-column: 1 / -1; }
@media (min-width: 768px) {
  .post-card--featured { padding: 2.5rem; }
  .post-card--featured .post-card__title { font-size: 2.125rem; line-height: 1.3; }
  .post-card--featured .post-card__summary { -webkit-line-clamp: 3; }
}
@media (min-width: 1024px) {
  .post-card--featured {
    display: grid; grid-template-columns: minmax(0, 1fr) 24rem; column-gap: 3rem; align-content: center;
  }
  .post-card--featured .post-card__title, .post-card--featured .post-card__meta { grid-column: 1; }
  .post-card--featured .post-card__summary {
    grid-column: 2; grid-row: 1 / span 2; align-self: center; margin: 0; -webkit-line-clamp: 4;
    padding-left: 1.5rem; border-left: 1px solid var(--border);
  }
}

.empty { text-align: center; color: var(--muted-foreground); padding: 4rem 0; }
.empty a { color: var(--foreground); border-bottom: 1px solid var(--hairline-strong); }
.empty__hint { font-size: .875rem; }

/* ============================================================
   Pagination
   ============================================================ */
.pagination { margin-top: 3rem; display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: .5rem; }
.pagination__btn {
  display: inline-flex; align-items: center; justify-content: center; min-width: 38px; height: 38px; padding: 0 .5rem;
  border-radius: 999px; border: 1px solid var(--hairline-strong);
  font-family: var(--font-mono); font-size: .875rem; font-weight: 500; color: var(--foreground);
  transition: background-color .15s, transform .15s;
}
a.pagination__btn:hover { background: var(--secondary); }
a.pagination__btn:active { transform: translateY(1px); }
.pagination__btn.is-current { background: var(--foreground); border-color: var(--foreground); color: var(--background); }
.pagination__btn.is-gap { border-color: transparent; color: var(--muted-foreground); }

/* ============================================================
   文章页
   ============================================================ */
.post-head__inner { padding: 1.5rem 0 2rem; }
.post-head__title { margin: 0 auto; max-width: 46rem; font-size: 1.75rem; font-weight: 500; line-height: 1.35; letter-spacing: -.02em; text-wrap: balance; }
.post-head__meta {
  margin-top: .875rem; display: flex; flex-wrap: wrap; justify-content: center; gap: .25rem .75rem;
  font-family: var(--font-mono); font-size: .8125rem; color: var(--muted-foreground);
}
.post-head__meta + .post-head__meta { margin-top: .375rem; }
@media (min-width: 768px) {
  .post-head__inner { padding: 2.5rem 0 2.75rem; }
  .post-head__title { font-size: 2.25rem; }
}

.post-body {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow-sm); padding: 2rem 1.25rem;
}
@media (min-width: 768px) { .post-body { padding: 3rem; } }

.toc {
  margin: 0 0 2rem; padding: .875rem 1.125rem; border-radius: .75rem;
  background: var(--background); border: 1px solid var(--border); font-size: .9rem;
}
.toc summary {
  cursor: pointer; font-family: var(--font-mono); font-size: .8125rem; color: var(--muted-foreground);
  list-style: none; display: flex; align-items: center; gap: .5rem; user-select: none;
}
.toc summary::-webkit-details-marker { display: none; }
.toc summary::before { content: "▸"; transition: transform .2s; display: inline-block; }
.toc[open] summary::before { transform: rotate(90deg); }
.toc__list { list-style: none; margin: .75rem 0 .25rem; padding: 0 0 0 .875rem; border-left: 1px solid var(--border); }
.toc__item { padding: .1875rem 0; line-height: 1.5; }
.toc__item a { color: var(--content); transition: color .15s; }
.toc__item a:hover { color: var(--foreground); }
[data-theme="dark"] .toc__item a:hover { color: var(--link-wave); }
.toc__item--h3 { padding-left: 1rem; font-size: .85rem; }
.toc__item--h3 a { color: var(--muted-foreground); }
.toc .katex { font-size: 1em; }

.post-tags {
  margin-top: 2.5rem; padding-top: 1.25rem; border-top: 1px dashed var(--border);
  display: flex; flex-wrap: wrap; align-items: baseline; gap: .375rem .5rem;
  font-family: var(--font-mono); font-size: .75rem; color: var(--faint);
}
.post-tags a { color: var(--muted-foreground); transition: color .15s; }
.post-tags a:hover { color: var(--foreground); }
[data-theme="dark"] .post-tags a:hover { color: var(--link-wave); }
.post-tags__label { margin-right: .25rem; }

.post-nav { margin-top: 1.5rem; display: grid; grid-template-columns: 1fr; gap: 1rem; }
@media (min-width: 640px) { .post-nav { grid-template-columns: 1fr 1fr; } }
.post-nav__item {
  display: flex; flex-direction: column; gap: .375rem; padding: 1.125rem 1.25rem;
  border-radius: var(--radius); border: 1px solid var(--border); background: var(--card);
  transition: border-color .2s, transform .2s, box-shadow .2s;
}
.post-nav__item:hover { border-color: var(--hairline-strong); transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.post-nav__item--right { text-align: right; }
.post-nav__label { font-family: var(--font-mono); font-size: .75rem; color: var(--muted-foreground); }
.post-nav__title { font-weight: 500; line-height: 1.45; }
[data-theme="dark"] .post-nav__item:hover .post-nav__title { color: var(--link-wave); }

/* ============================================================
   Markdown 正文
   ============================================================ */
.markdown { color: var(--content); line-height: 1.85; word-wrap: break-word; overflow-wrap: break-word; }
.markdown > :first-child { margin-top: 0 !important; }
.markdown > :last-child { margin-bottom: 0 !important; }
.markdown p, .markdown blockquote, .markdown ul, .markdown ol, .markdown dl,
.markdown .table-wrap, .markdown .code-block, .markdown details, .markdown figure { margin: 0 0 1.125rem; }

.markdown a {
  color: var(--foreground); font-weight: 500;
  background-image: var(--wave-image); background-repeat: repeat-x; background-position: 0 100%;
  background-size: 0 6px; padding-bottom: 4px;
  -webkit-box-decoration-break: clone; box-decoration-break: clone;
  border-bottom: 1px solid var(--hairline-strong);
  transition: color .2s, background-size .3s ease-out, border-color .2s;
}
.markdown a:hover { color: var(--link-wave); background-size: 20px 6px; border-bottom-color: transparent; }
.markdown a.heading-anchor, .markdown .footnote-ref a, .markdown a.footnote-backref { border: 0; background: none; padding: 0; }

.markdown strong, .markdown b { color: var(--foreground); font-weight: 600; }
.markdown h1, .markdown h2, .markdown h3, .markdown h4, .markdown h5, .markdown h6 {
  position: relative; color: var(--foreground); font-weight: 600; line-height: 1.35; letter-spacing: -.01em;
  margin: 2.25rem 0 1rem;
}
.markdown h1 { font-size: 1.625rem; }
.markdown h2 { font-size: 1.375rem; }
.markdown h3 { font-size: 1.125rem; }
.markdown h4 { font-size: 1rem; }
.markdown h5, .markdown h6 { font-size: .9375rem; color: var(--muted-foreground); }
.markdown .heading-anchor { margin-right: .5rem; color: var(--faint); opacity: .55; font-weight: 500; transition: color .15s, opacity .15s; }
.markdown .heading-anchor:hover { color: var(--foreground); opacity: 1; }
[data-theme="dark"] .markdown .heading-anchor:hover { color: var(--link-wave); }

.markdown hr { border: 0; border-top: 1px solid var(--border); margin: 2.25rem 0; }
.markdown img { max-width: 100%; height: auto; border-radius: .75rem; display: block; margin: 0 auto; }
.markdown p > img:only-child { margin: 1.5rem auto; }
.markdown figure { text-align: center; }
.markdown figcaption { font-size: .8125rem; color: var(--muted-foreground); margin-top: .5rem; }

.markdown blockquote {
  margin-left: 0; margin-right: 0; padding: .25rem 0 .25rem 1.25rem;
  color: var(--muted-foreground); border-left: 2px solid var(--hairline-strong);
}
.markdown blockquote > :last-child { margin-bottom: 0; }

.markdown ul, .markdown ol { padding-left: 1.75em; }
.markdown ul { list-style: disc; }
.markdown ul ul { list-style: circle; }
.markdown ul ul ul { list-style: square; }
.markdown li + li { margin-top: .375em; }
.markdown li > ul, .markdown li > ol { margin: .375em 0 0; }
.markdown li > p { margin: .5em 0; }
.markdown li::marker { color: var(--muted-foreground); }
.markdown ol > li::marker { font-family: var(--font-mono); font-size: .875em; }

.markdown code {
  font-family: var(--font-mono); font-size: .85em; font-weight: 500;
  padding: .15em .45em; margin: 0 .1em; border-radius: 6px;
  background: var(--secondary); color: var(--foreground); border: 1px solid var(--border);
}
.markdown h1 code, .markdown h2 code, .markdown h3 code { font-size: .9em; }

.markdown .table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: .75rem; }
.markdown table { width: 100%; border-collapse: collapse; font-size: .9375rem; line-height: 1.6; }
.markdown th, .markdown td { padding: .5rem .875rem; border-bottom: 1px solid var(--border); text-align: left; }
.markdown th + th, .markdown td + td { border-left: 1px solid var(--border); }
.markdown tbody tr:last-child td { border-bottom: 0; }
.markdown th { color: var(--foreground); font-weight: 600; background: var(--background); white-space: nowrap; }
.markdown tbody tr { transition: background-color .15s; }
.markdown tbody tr:hover { background: color-mix(in srgb, var(--link-wave) 8%, transparent); }

.markdown details { border: 1px solid var(--border); border-radius: .75rem; padding: .75rem 1rem; }
.markdown details > summary { cursor: pointer; font-weight: 500; color: var(--foreground); }
.markdown details[open] > summary { margin-bottom: .75rem; }
.markdown kbd {
  font-family: var(--font-mono); font-size: .8em; padding: .1em .45em; border-radius: 5px;
  border: 1px solid var(--hairline-strong); border-bottom-width: 2px; background: var(--card);
}
.markdown mark { background: color-mix(in srgb, var(--accent) 25%, transparent); color: inherit; padding: 0 .15em; border-radius: 3px; }

/* 脚注 */
.markdown .footnote-ref a { font-family: var(--font-mono); font-size: .75em; color: var(--accent); }
.markdown hr.footnotes-sep { margin: 2.5rem 0 1rem; border-top-style: dashed; }
.markdown .footnotes { font-size: .875rem; color: var(--muted-foreground); }
.markdown .footnotes-list { padding-left: 1.5em; }
.markdown .footnote-backref { font-family: var(--font-mono); margin-left: .25rem; }

/* ============================================================
   数学公式（KaTeX）
   ============================================================ */
.markdown .katex { font-size: 1.07em; }
.markdown eqn { display: block; margin: 1.25rem 0; }
.markdown .katex-display {
  margin: 0; padding: .375rem 0; overflow-x: auto; overflow-y: hidden;
  scrollbar-width: thin;
}
.markdown .katex-display > .katex { white-space: nowrap; }
.markdown section.eqno { display: flex; align-items: center; gap: 1rem; margin: 1.25rem 0; }
.markdown section.eqno > eqn { flex: 1; min-width: 0; margin: 0; }
.markdown section.eqno > span { flex-shrink: 0; font-family: var(--font-mono); font-size: .875rem; color: var(--muted-foreground); }
.markdown .katex-error { color: #dc2626; font-family: var(--font-mono); font-size: .875em; }
.markdown li eqn, .markdown blockquote eqn { margin: .75rem 0; }

/* ============================================================
   代码块
   ============================================================ */
.code-block {
  position: relative; overflow: hidden; border-radius: .75rem;
  border: 1px solid var(--border); background: var(--code-bg);
}
.code-bar {
  display: flex; align-items: center; gap: .75rem; height: 2.375rem; padding: 0 .5rem 0 1rem;
  background: var(--code-bar); border-bottom: 1px solid color-mix(in srgb, var(--code-muted) 18%, transparent);
}
.code-dots { display: inline-flex; gap: 6px; }
.code-dots i { width: 10px; height: 10px; border-radius: 50%; background: #ff5f57; }
.code-dots i:nth-child(2) { background: #febc2e; }
.code-dots i:nth-child(3) { background: #28c840; }
.code-lang { flex: 1; font-family: var(--font-mono); font-size: .75rem; color: var(--code-muted); text-transform: lowercase; }
.code-copy {
  border: 0; background: transparent; cursor: pointer; padding: .25rem .625rem; border-radius: 6px;
  font-family: var(--font-mono); font-size: .75rem; color: var(--code-muted); transition: color .15s, background-color .15s;
}
.code-copy:hover { color: var(--code-fg); background: color-mix(in srgb, var(--code-muted) 15%, transparent); }
.code-copy.is-done { color: var(--hl-green); }
.code-block pre {
  margin: 0; padding: 1rem 1.25rem; overflow-x: auto; background: transparent;
  font-family: var(--font-mono); font-size: .875rem; line-height: 1.65; color: var(--code-fg);
  tab-size: 4; scrollbar-width: thin;
}
.code-block pre code { all: unset; font: inherit; white-space: pre; }
.markdown .code-block pre code { padding: 0; margin: 0; border: 0; background: none; font-size: inherit; font-weight: 400; color: inherit; }

/* highlight.js（Gruvbox 配色） */
.hljs-comment, .hljs-quote { color: var(--hl-gray); font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-section, .hljs-doctag, .hljs-name { color: var(--hl-red); }
.hljs-string, .hljs-regexp, .hljs-addition, .hljs-meta .hljs-string { color: var(--hl-green); }
.hljs-number, .hljs-literal, .hljs-symbol, .hljs-bullet { color: var(--hl-purple); }
.hljs-title, .hljs-title.function_, .hljs-section { color: var(--hl-green); font-weight: 500; }
.hljs-title.class_, .hljs-type, .hljs-built_in { color: var(--hl-yellow); }
.hljs-attr, .hljs-attribute, .hljs-property, .hljs-selector-class, .hljs-selector-id { color: var(--hl-blue); }
.hljs-variable, .hljs-template-variable, .hljs-params { color: var(--hl-blue); }
.hljs-meta, .hljs-meta .hljs-keyword { color: var(--hl-aqua); }
.hljs-operator, .hljs-subst, .hljs-tag { color: var(--hl-orange); }
.hljs-link { color: var(--hl-blue); text-decoration: underline; }
.hljs-deletion { color: var(--hl-red); }
.hljs-emphasis { font-style: italic; }
.hljs-strong { font-weight: 700; }

/* ============================================================
   归档
   ============================================================ */
.archive__year + .archive__year { margin-top: 2.5rem; }
.archive__year-title {
  display: flex; align-items: baseline; gap: .625rem; margin: 0 0 .75rem;
  font-family: var(--font-mono); font-size: 1.125rem; font-weight: 500; color: var(--foreground);
}
.archive__year-title span { font-size: .75rem; color: var(--faint); }
.archive__list { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--border); }
.archive__item { position: relative; display: flex; gap: 1.25rem; align-items: baseline; padding: .5rem 0 .5rem 1.25rem; }
.archive__item::before {
  content: ""; position: absolute; left: -3px; top: 1.05rem; width: 5px; height: 5px; border-radius: 50%;
  background: var(--hairline-strong); transition: background-color .15s, transform .15s;
}
.archive__item:hover::before { background: var(--accent); transform: scale(1.4); }
.archive__item time { flex-shrink: 0; font-family: var(--font-mono); font-size: .8125rem; color: var(--muted-foreground); }
.archive__item a { color: var(--foreground); line-height: 1.55; transition: color .15s; }
.archive__item a:hover { color: var(--muted-foreground); }
[data-theme="dark"] .archive__item a:hover { color: var(--link-wave); }

.tag-index { margin-top: 4rem; padding-top: 1.5rem; border-top: 1px dashed var(--border); }
.tag-index__title { margin: 0 0 .75rem; font-family: var(--font-mono); font-size: .75rem; font-weight: 500; color: var(--faint); letter-spacing: .1em; }
.tag-index__list { margin: 0; display: flex; flex-wrap: wrap; gap: .25rem 1rem; font-size: .875rem; }
.tag-index__list a { color: var(--muted-foreground); transition: color .15s; }
.tag-index__list a:hover { color: var(--foreground); }
[data-theme="dark"] .tag-index__list a:hover { color: var(--link-wave); }
.tag-index__list sup { font-family: var(--font-mono); font-size: .625rem; color: var(--faint); margin-left: .125rem; }
.archive__back { margin-top: 3rem; font-size: .875rem; }
.archive__back a { color: var(--muted-foreground); }
.archive__back a:hover { color: var(--foreground); }

/* ============================================================
   Footer
   ============================================================ */
.site-footer { border-top: 1px solid var(--border); padding: 2rem 1.5rem; color: var(--muted-foreground); }
.site-footer__inner { max-width: 1200px; margin: 0 auto; display: flex; flex-direction: column; align-items: center; gap: .5rem; text-align: center; }
.site-footer__social { display: flex; gap: .25rem; }
.site-footer__social a { display: inline-flex; padding: .5rem; border-radius: 999px; transition: color .15s; }
.site-footer__social a:hover { color: var(--foreground); }
[data-theme="dark"] .site-footer__social a:hover { color: var(--link-wave); }
.site-footer__copy { margin: 0; font-family: var(--font-mono); font-size: .75rem; }

/* ============================================================
   私密文章
   ============================================================ */
.private-badge {
  display: inline-flex; align-items: center; gap: .375rem; margin: 0 0 1rem; padding: .25rem .75rem;
  border-radius: 999px; border: 1px dashed var(--hairline-strong);
  font-family: var(--font-mono); font-size: .75rem; color: var(--muted-foreground); background: var(--card);
}

/* ============================================================
   分类（低调呈现）
   ============================================================ */
.post-card__meta > .sep { color: var(--faint); opacity: .6; }
.post-card__cat { position: relative; z-index: 1; color: var(--muted-foreground); transition: color .15s; }
.post-card__cat:hover { color: var(--foreground); }
[data-theme="dark"] .post-card__cat:hover { color: var(--link-wave); }
.post-head__cat { color: var(--muted-foreground); border-bottom: 1px dashed var(--hairline-strong); transition: color .15s, border-color .15s; }
.post-head__cat:hover { color: var(--foreground); border-bottom-color: currentColor; }
[data-theme="dark"] .post-head__cat:hover { color: var(--link-wave); }

.page-head__kind { color: var(--faint); margin-right: .125rem; }
.page-head__desc { margin: .75rem auto 0; max-width: 36rem; font-size: .9375rem; color: var(--muted-foreground); }

.cat-filter { display: flex; flex-wrap: wrap; gap: .375rem; margin: 0 0 2.5rem; }
.cat-filter a {
  display: inline-flex; align-items: baseline; padding: .25rem .75rem; border-radius: 999px;
  font-size: .8125rem; color: var(--muted-foreground); border: 1px solid transparent;
  transition: color .15s, background-color .15s, border-color .15s;
}
.cat-filter a:hover { color: var(--foreground); border-color: var(--border); }
.cat-filter a.is-active { color: var(--foreground); background: var(--card); border-color: var(--border); }
.cat-filter sup { font-family: var(--font-mono); font-size: .625rem; color: var(--faint); margin-left: .1875rem; }

/* ============================================================
   附件：文件卡片 / 嵌入预览
   ============================================================ */
.file-card {
  display: flex; align-items: center; gap: .875rem; padding: .75rem .875rem;
  border: 1px solid var(--border); border-radius: .75rem; background: var(--card);
  line-height: 1.4; transition: border-color .15s;
}
.file-card:hover { border-color: var(--hairline-strong); }
.markdown > .file-card { margin: 0 0 1.125rem; }
.file-card__icon {
  flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center;
  width: 2.5rem; height: 2.75rem; border-radius: .375rem;
  font-family: var(--font-mono); font-size: .625rem; font-weight: 600; letter-spacing: .02em;
  color: #fff; background: #78716c;
}
.file-card[data-kind="pdf"] .file-card__icon { background: #dc2626; }
.file-card[data-kind="word"] .file-card__icon { background: #2563eb; }
.file-card[data-kind="powerpoint"] .file-card__icon { background: #ea580c; }
.file-card[data-kind="excel"] .file-card__icon { background: #16a34a; }
.file-card[data-kind="image"] .file-card__icon { background: #9333ea; }
.file-card__body { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: .125rem; }
.markdown .file-card a { border: 0; background: none; padding: 0; }
.markdown .file-card .file-card__name, .file-card__name {
  color: var(--foreground); font-weight: 500; font-size: .9375rem;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.markdown .file-card .file-card__name:hover { color: var(--foreground); text-decoration: underline; text-underline-offset: 3px; }
.file-card__meta { font-family: var(--font-mono); font-size: .75rem; color: var(--muted-foreground); }
.markdown .file-card .file-card__btn, .file-card__btn {
  flex-shrink: 0; display: inline-flex; align-items: center; height: 2rem; padding: 0 .875rem; border-radius: 999px;
  border: 1px solid var(--hairline-strong); font-size: .8125rem; font-weight: 500; color: var(--foreground);
  transition: background-color .15s;
}
.markdown .file-card .file-card__btn:hover, .file-card__btn:hover { background: var(--secondary); color: var(--foreground); }

.file-embed { margin: 1.5rem 0; border: 1px solid var(--border); border-radius: .875rem; overflow: hidden; background: var(--card); }
.file-embed > .file-card { border: 0; border-bottom: 1px solid var(--border); border-radius: 0; }
.file-embed__viewer { background: var(--background); }
.file-embed__msg {
  display: flex; align-items: center; justify-content: center; gap: .75rem; flex-wrap: wrap;
  min-height: 7rem; padding: 1.5rem; text-align: center; font-size: .875rem; color: var(--muted-foreground);
}
.file-embed__msg.is-loading > span::before {
  content: ""; display: inline-block; width: .875rem; height: .875rem; margin-right: .5rem; vertical-align: -2px;
  border: 2px solid var(--hairline-strong); border-top-color: var(--foreground); border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.file-embed__retry { border: 1px solid var(--hairline-strong); background: var(--card); border-radius: 999px; padding: .25rem .75rem; font-size: .8125rem; cursor: pointer; }

/* PDF 阅读器 */
.pdf-bar { display: flex; align-items: center; justify-content: space-between; gap: .5rem; padding: .375rem .625rem .375rem .875rem; border-bottom: 1px solid var(--border); background: var(--card); }
.pdf-bar__page { font-family: var(--font-mono); font-size: .75rem; color: var(--muted-foreground); }
.pdf-bar__btn { border: 0; background: transparent; cursor: pointer; padding: .25rem .625rem; border-radius: 6px; font-size: .75rem; color: var(--muted-foreground); }
.pdf-bar__btn:hover { background: var(--secondary); color: var(--foreground); }
.pdf-pages { overflow-y: auto; padding: 12px; display: flex; flex-direction: column; gap: 12px; scrollbar-width: thin; overscroll-behavior: contain; }
.pdf-pages:focus { outline: none; }
.pdf-page { position: relative; width: 100%; flex-shrink: 0; background: #fff; border-radius: 4px; box-shadow: 0 1px 3px rgb(0 0 0 / .12); overflow: hidden; }
.pdf-page canvas { display: block; width: 100%; height: 100%; }
.file-embed:fullscreen { display: flex; flex-direction: column; border-radius: 0; border: 0; }
.file-embed:fullscreen .file-embed__viewer { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.file-embed:fullscreen .pdf-pages { flex: 1; height: auto; align-items: center; }
.file-embed:fullscreen .pdf-page { max-width: min(100%, 1100px); }

/* Excel 表格 */
.sheet-wrap { max-height: 70vh; overflow: auto; background: var(--card); scrollbar-width: thin; }
.markdown .sheet-wrap table, .sheet { border-collapse: separate; border-spacing: 0; width: max-content; min-width: 100%; font-size: .8125rem; line-height: 1.5; }
.sheet th, .sheet td { padding: .3rem .625rem; border-right: 1px solid var(--border); border-bottom: 1px solid var(--border); white-space: pre; text-align: left; vertical-align: top; max-width: 28rem; overflow: hidden; text-overflow: ellipsis; }
.markdown .sheet th + th, .markdown .sheet td + td { border-left: 0; }
.sheet thead th { position: sticky; top: 0; z-index: 2; background: var(--secondary); color: var(--muted-foreground); font-weight: 500; font-family: var(--font-mono); font-size: .6875rem; text-align: center; }
.sheet tbody th { position: sticky; left: 0; z-index: 1; background: var(--secondary); color: var(--muted-foreground); font-weight: 400; font-family: var(--font-mono); font-size: .6875rem; text-align: right; min-width: 2.5rem; }
.sheet thead .sheet__corner { left: 0; z-index: 3; }
.sheet tbody th, .sheet .sheet__corner { width: 1%; }
.sheet td.num { text-align: right; font-variant-numeric: tabular-nums; }
.markdown .sheet tbody tr:hover { background: transparent; }
.sheet tbody tr:hover td { background: color-mix(in srgb, var(--link-wave) 7%, transparent); }
.sheet-note { padding: .5rem .875rem; font-size: .75rem; color: var(--muted-foreground); border-top: 1px solid var(--border); background: var(--card); }
.sheet-tabs { display: flex; gap: .25rem; overflow-x: auto; padding: .375rem .5rem; border-top: 1px solid var(--border); background: var(--card); scrollbar-width: thin; }
.sheet-tab { flex-shrink: 0; border: 1px solid transparent; background: transparent; cursor: pointer; padding: .25rem .75rem; border-radius: 6px; font-size: .8125rem; color: var(--muted-foreground); }
.sheet-tab:hover { color: var(--foreground); }
.sheet-tab.is-active { color: var(--foreground); background: var(--secondary); border-color: var(--border); }

@media (max-width: 560px) {
  .file-card { gap: .625rem; padding: .625rem; }
  .file-card__icon { width: 2.125rem; height: 2.375rem; }
  .pdf-pages { padding: 8px; gap: 8px; }
}