:root {
  --bg: #f7f5f0;
  --paper: #fffdf8;
  --ink: #23201b;
  --muted: #726d64;
  --soft: #d8d0c3;
  --line: #e7dfd2;
  --accent: #8c3f2f;
  --accent-dark: #642d23;
  --code-bg: #f0eee8;
  --code-ink: #28231d;
  --shadow: 0 24px 70px rgba(67, 51, 34, 0.08);
  --font-serif: "Iowan Old Style", "Palatino Linotype", "Songti SC", "Noto Serif CJK SC", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Monaco, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
pre,
hr,
dl,
dd,
ol,
ul,
figure {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(140, 63, 47, 0.08), transparent 30rem),
    linear-gradient(180deg, #fbfaf6 0%, var(--bg) 46rem);
  font: 400 18px/1.78 var(--font-serif);
  -webkit-text-size-adjust: 100%;
  font-feature-settings: "kern" 1;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.28;
  background-image:
    linear-gradient(rgba(35, 32, 27, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(35, 32, 27, 0.025) 1px, transparent 1px);
  background-size: 42px 42px;
}

a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 0.22em;
  transition: color 180ms ease, background-color 180ms ease, border-color 180ms ease;
}

a:visited {
  color: var(--accent-dark);
}

a:hover {
  color: var(--ink);
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

button {
  font: inherit;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

figure {
  margin: 2rem 0;
}

figcaption {
  margin-top: 0.65rem;
  color: var(--muted);
  font: 500 0.82rem/1.5 var(--font-sans);
}

.wrapper {
  width: min(100% - 2rem, 760px);
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: 1rem;
  transform: translateY(-180%);
  z-index: 10;
  padding: 0.55rem 0.8rem;
  color: var(--paper);
  background: var(--ink);
  border-radius: 0.35rem;
  font: 600 0.82rem/1 var(--font-sans);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  border-bottom: 1px solid rgba(35, 32, 27, 0.1);
  background: rgba(247, 245, 240, 0.84);
  backdrop-filter: blur(18px);
}

.header-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4.5rem;
  gap: 1.5rem;
}

.site-title {
  color: var(--ink);
  font: 650 1.05rem/1.1 var(--font-sans);
}

.site-title:visited {
  color: var(--ink);
}

.site-title:hover {
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  color: var(--muted);
  font: 600 0.78rem/1 var(--font-sans);
}

.site-nav a {
  color: var(--muted);
  padding: 0.35rem 0;
}

.site-nav a:hover {
  color: var(--ink);
  text-decoration: none;
}

.page-content {
  padding: 2.5rem 0 4.5rem;
}

.home-header {
  margin-bottom: 1.25rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
}

.home-header .eyebrow {
  margin-bottom: 0;
}

.eyebrow {
  margin-bottom: 0.8rem;
  color: var(--accent);
  font: 700 0.74rem/1.2 var(--font-sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-header h1,
.not-found h1 {
  max-width: 11ch;
  margin-bottom: 0;
  color: var(--ink);
  font: 700 2.25rem/1.08 var(--font-serif);
  letter-spacing: 0;
  text-wrap: balance;
}

.not-found p {
  max-width: 44rem;
  color: var(--muted);
  font: 500 1rem/1.65 var(--font-sans);
}

.post-list {
  display: grid;
  gap: 0;
  margin: 0;
  list-style: none;
}

.post-list li {
  display: grid;
  grid-template-columns: 8.6rem minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: baseline;
  padding: 0.95rem 0;
  border-bottom: 1px solid rgba(35, 32, 27, 0.09);
}

.post-list time {
  color: var(--muted);
  font: 600 0.82rem/1.4 var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.post-list a {
  color: var(--ink);
  font: 600 1.05rem/1.45 var(--font-sans);
}

.post-list a:hover {
  color: var(--accent);
  text-decoration: none;
}

.post-category {
  color: var(--muted);
  font: 600 0.72rem/1 var(--font-sans);
}

.post-header {
  margin-bottom: 3.2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--line);
}

.back-link {
  display: inline-flex;
  margin-bottom: 2.4rem;
  color: var(--muted);
  font: 650 0.82rem/1 var(--font-sans);
}

.back-link::before {
  content: "<";
  margin-right: 0.45rem;
}

.post-title {
  margin-bottom: 1rem;
  color: var(--ink);
  font: 760 2.8rem/1.12 var(--font-serif);
  letter-spacing: 0;
  text-wrap: balance;
}

.post-date {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  color: var(--muted);
  font: 600 0.86rem/1.45 var(--font-sans);
}

.post-date time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.post-content {
  overflow-wrap: break-word;
}

.post-content > * + * {
  margin-top: 1.05rem;
}

.post-content p,
.post-content li {
  text-wrap: pretty;
}

.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4 {
  color: var(--ink);
  font-family: var(--font-sans);
  font-weight: 750;
  line-height: 1.24;
  letter-spacing: 0;
  text-wrap: balance;
}

.post-content h1,
.post-content h2 {
  margin-top: 2.8rem;
  font-size: 1.65rem;
}

.post-content h3 {
  margin-top: 2.1rem;
  font-size: 1.28rem;
}

.post-content h4 {
  margin-top: 1.8rem;
  font-size: 1.08rem;
}

.post-content ul,
.post-content ol {
  margin-left: 1.25rem;
  padding-left: 0.5rem;
}

.post-content li + li {
  margin-top: 0.35rem;
}

blockquote {
  margin: 1.75rem 0;
  padding: 1rem 1.15rem;
  color: #4d493f;
  background: rgba(255, 253, 248, 0.68);
  border-left: 0.22rem solid var(--accent);
  box-shadow: var(--shadow);
  font-style: normal;
}

blockquote > :last-child {
  margin-bottom: 0;
}

hr {
  margin: 2.5rem 0;
  border: 0;
  border-top: 1px solid var(--line);
}

pre,
code {
  color: var(--code-ink);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

code {
  padding: 0.13rem 0.35rem;
  background: var(--code-bg);
  border: 1px solid rgba(35, 32, 27, 0.08);
  border-radius: 0.3rem;
}

pre {
  overflow-x: auto;
  margin: 1.45rem 0;
  padding: 1.05rem 1.15rem;
  background: #211d18;
  border-radius: 0.55rem;
  box-shadow: 0 18px 46px rgba(35, 32, 27, 0.15);
}

pre code {
  padding: 0;
  color: #f4efe6;
  background: transparent;
  border: 0;
}

.highlight {
  margin: 1.45rem 0;
  background: transparent;
}

.highlighter-rouge .highlight {
  background: transparent;
}

.highlight pre {
  margin: 0;
}

pre.highlight,
.post-content pre.highlight,
.highlighter-rouge pre.highlight,
.highlighter-rouge .highlight pre,
.highlight pre {
  background: #211d18;
}

.post-content img,
.image-responsive,
.img-responsive {
  margin: 2rem auto;
  border-radius: 0.4rem;
  box-shadow: 0 18px 48px rgba(35, 32, 27, 0.14);
}

.post-content a {
  border-bottom: 1px solid rgba(140, 63, 47, 0.26);
}

.post-content a:hover {
  border-bottom-color: transparent;
}

.comments {
  margin-top: 4.5rem;
  padding: 1.35rem 1.35rem 1.1rem;
  background:
    linear-gradient(180deg, rgba(255, 253, 248, 0.82), rgba(247, 245, 240, 0.72)),
    var(--paper);
  border: 1px solid rgba(140, 63, 47, 0.12);
  border-radius: 0.5rem;
  box-shadow: 0 18px 50px rgba(67, 51, 34, 0.07);
}

.comments h2 {
  margin-bottom: 0.9rem;
  color: var(--accent);
  font: 750 0.78rem/1.2 var(--font-sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.comments .giscus,
.comments .giscus-frame {
  display: block;
  width: 100%;
}

.comments .giscus-frame {
  color-scheme: light;
  border: 0;
}

.comments-note {
  color: var(--muted);
  font: 500 0.95rem/1.6 var(--font-sans);
}

.site-footer {
  padding: 2.5rem 0 3rem;
  border-top: 1px solid rgba(35, 32, 27, 0.1);
  color: var(--muted);
}

.footer-wrapper {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  align-items: center;
  font: 600 0.82rem/1.55 var(--font-sans);
}

.footer-wrapper p {
  max-width: 32rem;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  white-space: nowrap;
}

.footer-links a,
.wechat-link button {
  color: var(--muted);
}

.footer-links a:hover,
.wechat-link button:hover {
  color: var(--ink);
  text-decoration: none;
}

.wechat-link {
  position: relative;
}

.wechat-link button {
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  font: inherit;
}

.wechat-card {
  position: absolute;
  right: 0;
  bottom: calc(100% + 0.8rem);
  width: 9rem;
  padding: 0.55rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transform: translateY(0.4rem);
  transition: opacity 180ms ease, transform 180ms ease;
}

.wechat-link:hover .wechat-card,
.wechat-link:focus-within .wechat-card {
  opacity: 1;
  transform: translateY(0);
}

.wechat-card img {
  border-radius: 0.35rem;
}

.not-found {
  padding: 4rem 0 6rem;
}

.text-link {
  display: inline-flex;
  margin-top: 1.4rem;
  font: 700 0.9rem/1 var(--font-sans);
}

.mjx-container {
  overflow-x: auto;
  overflow-y: hidden;
  max-width: 100%;
  padding: 0.2rem 0;
}

/* Rouge syntax colors tuned for the dark code block surface. */
.highlight .c,
.highlight .cm,
.highlight .c1,
.highlight .cs {
  color: #92897a;
  font-style: italic;
}

.highlight .err {
  color: #ffb4a6;
}

.highlight .k,
.highlight .kc,
.highlight .kd,
.highlight .kp,
.highlight .kr,
.highlight .o,
.highlight .ow {
  color: #e6c384;
  font-weight: 700;
}

.highlight .kt,
.highlight .nc,
.highlight .nf,
.highlight .nt {
  color: #8fc7d8;
}

.highlight .m,
.highlight .mf,
.highlight .mh,
.highlight .mi,
.highlight .mo,
.highlight .il {
  color: #c7d98c;
}

.highlight .s,
.highlight .s1,
.highlight .s2,
.highlight .sb,
.highlight .sc,
.highlight .sd,
.highlight .se,
.highlight .sh,
.highlight .si,
.highlight .sx {
  color: #f0a987;
}

.highlight .na,
.highlight .nb,
.highlight .no,
.highlight .nv,
.highlight .vc,
.highlight .vg,
.highlight .vi {
  color: #b6d7a8;
}

.highlight .ge {
  font-style: italic;
}

.highlight .gs {
  font-weight: 700;
}

.highlight .gh,
.highlight .gu {
  color: #d4cab8;
}

.highlight .gd {
  color: #ffb4a6;
}

.highlight .gi {
  color: #b6d7a8;
}

.highlight .go,
.highlight .gp,
.highlight .w {
  color: #aaa093;
}

@media (max-width: 720px) {
  body {
    font-size: 17px;
    line-height: 1.72;
  }

  .wrapper {
    width: min(100% - 1.35rem, 760px);
  }

  .header-wrapper,
  .footer-wrapper {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav,
  .footer-links {
    flex-wrap: wrap;
  }

  .page-content {
    padding: 1.9rem 0 3.5rem;
  }

  .page-header h1,
  .not-found h1 {
    font-size: 1.9rem;
  }

  .post-list li {
    grid-template-columns: 1fr;
    gap: 0.35rem;
    padding: 1rem 0;
  }

  .post-title {
    font-size: 2.2rem;
  }

  .post-content h1,
  .post-content h2 {
    font-size: 1.42rem;
  }

  pre {
    margin-right: -0.35rem;
    margin-left: -0.35rem;
    border-radius: 0.4rem;
  }

  .comments {
    margin-right: -0.15rem;
    margin-left: -0.15rem;
    padding: 1rem 0.9rem 0.85rem;
  }
}