/* ——— Design System ——— */
:root {
  --bg: #ffffff;
  --text: #1f1f1f;
  --text-secondary: #555555;
  --accent: #3a3a3a;
  --accent-hover: #000000;
  --border: #e2e2e2;
  --surface: #f6f6f6;
  --muted: #8c8c8c;
  --heading: #161616;
  --separator: #d6d6d6;
  --footer: #aaaaaa;
  --pill-text: #6a6a6a;
  --leader: #c9c9c9;
  --rule: #1f1f1f;

  --selection-bg: #1f1f1f;
  --selection-text: #ffffff;

  --font-mono: "Berkeley Mono", "JetBrains Mono", "Fira Code", monospace;
  --content-width: 680px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0c0c;
    --text: #dadada;
    --text-secondary: #9c9c9c;
    --accent: #c2c2c2;
    --accent-hover: #ffffff;
    --border: #242424;
    --surface: #161616;
    --muted: #707070;
    --heading: #f4f4f4;
    --separator: #2c2c2c;
    --footer: #555555;
    --pill-text: #9a9a9a;
    --leader: #3a3a3a;
    --rule: #dadada;

    --selection-bg: #e8e8e8;
    --selection-text: #0c0c0c;
  }
}

/* ——— Reset ——— */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: normal;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

::selection {
  background-color: var(--selection-bg);
  color: var(--selection-text);
}

/* ——— Layout ——— */
.wrap {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 3.5em 24px 40px;
}

/* ——— Post block ——— */
.post-block {
  /* container */
}

.post-title {
  font-family: var(--font-mono);
  font-size: 1.4em;
  font-weight: 400;
  letter-spacing: 0.01em;
  text-align: center;
  margin-top: 0;
  margin-bottom: 0.75em;
  color: var(--heading);
}

/* Blog post page heading */
.post-heading {
  font-family: var(--font-mono);
  font-size: 1.2em;
  font-weight: 400;
  line-height: 1.5;
  margin-bottom: 2em;
  color: var(--heading);
}

/* ——— Social links ——— */
.social-links {
  text-align: center;
  margin: 0.75em 0 3.2em;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0;
}

.social-links .social-link {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-family: var(--font-mono);
  font-size: 0.62em;
  color: var(--pill-text);
  text-decoration: none;
  transition: color 0.15s;
  cursor: pointer;
}

.social-links .social-link:hover {
  color: var(--accent-hover);
}

.social-links .separator {
  margin: 0 0.7em;
  font-size: 0.62em;
  line-height: 1;
  color: var(--muted);
}

/* ——— Post content ——— */
.post-content {
  font-family: var(--font-mono);
  font-size: 0.9em;
  line-height: 1.9;
  color: var(--text);
}

.post-content p {
  margin: 1.5em 0;
  line-height: 1.9;
  color: var(--text);
}

.post-content a {
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  color: var(--accent);
  transition: color 0.15s, border-color 0.15s;
}

.post-content a:hover {
  color: var(--accent-hover);
  border-bottom: 1px solid var(--accent-hover);
}

/* ——— Headings ——— */
.post-content h2,
.post-content h3,
.post-content h4,
.post-content h5,
.post-content h6 {
  font-family: var(--font-mono);
  font-weight: 400;
  font-variant: small-caps;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.55em;
  margin-top: 3.4em;
  margin-bottom: 1.2em;
  color: var(--muted);
}

.post-content h2 { font-size: 0.82em; }
.post-content h3 { font-size: 0.78em; }

/* ——— Lists ——— */
.post-content ul,
.post-content ol {
  list-style: none;
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 0;
  margin: 1.4em 0;
}

.post-content li {
  color: var(--text);
  margin: 0;
  padding: 0.85em 0;
  font-size: 0.85em;
  line-height: 1.7;
  display: flex;
  flex-wrap: nowrap;
  align-items: baseline;
  gap: 0;
}

.post-content li::marker {
  content: none;
}

/* Links inside list items — bracket-wrapped, right-aligned */
.post-content li a {
  order: 2;
  flex: 0 0 auto;
  display: inline-block;
  font-size: 0.92em;
  background: transparent;
  border-radius: 0;
  padding: 0;
  margin-left: 0.45em;
  transition: color 0.15s;
  white-space: nowrap;
  color: var(--pill-text);
  border: none;
}

.post-content li a:first-of-type {
  margin-left: auto;
  padding-left: 1em;
}

.post-content li a::before { content: "["; color: var(--muted); }
.post-content li a::after  { content: "]"; color: var(--muted); }

.post-content li a:hover {
  background: transparent;
  color: var(--accent-hover);
}

/* ——— Blockquotes ——— */
.post-content blockquote {
  background: transparent;
  padding: 0.2em 1em;
  border-radius: 0;
  color: var(--text-secondary);
  border-left: 2px solid var(--border);
  margin: 1.5em 0;
}

/* ——— Code ——— */
.post-content code {
  border-radius: 2px;
  padding: 0.1em 0.3em;
  font-family: var(--font-mono);
  font-size: 0.92em;
  background-color: var(--surface);
  color: var(--accent);
}

.post-content pre {
  background: var(--surface);
  padding: 16px;
  border-radius: 4px;
  overflow-x: auto;
  margin-bottom: 1.5em;
}

.post-content pre code {
  background: none;
  padding: 0;
  border-radius: 0;
}

/* ——— Images ——— */
.post-content img {
  border: none;
  border-radius: 0;
  box-shadow: none;
  max-width: 100%;
  display: block;
  margin: 2em auto 0.6em;
  opacity: 1;
}

.post-content center {
  display: block;
  color: var(--muted);
  font-style: italic;
  font-size: 0.8em;
  margin-bottom: 2.4em;
}

/* ——— Misc ——— */
.post-content hr {
  border: none;
  border-top: 1px solid var(--separator);
  margin: 40px 0;
}

.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1.5em;
  font-size: 0.85em;
}

.post-content th,
.post-content td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}

.post-content th {
  background: var(--surface);
  font-weight: 600;
}

/* ——— Footer ——— */
/* Hidden — matching Han Xiao's about page style */
footer, .copyright {
  display: none;
}

/* ——— Responsive ——— */
@media (max-width: 600px) {
  .wrap {
    padding: 2.5em 16px 32px;
  }

  .post-title {
    font-size: 1.2em;
  }
}