/* Original blog palette. Follow the system until a theme is selected. */
:root {
  color-scheme: light dark;
  --light: light-dark(#fcfaf4, #1a1f28);
  --lightgray: light-dark(#e5e5e5, #393639);
  --gray: light-dark(#b8b8b8, #646464);
  --darkgray: light-dark(#4e4e4e, #d4d4d4);
  --dark: light-dark(#2b2b2b, #ebebec);
  --secondary: light-dark(#284b63, #aacce2);
  --tertiary: light-dark(#84a59d, #aae2dd);
  --highlight: rgba(143, 159, 169, 0.15);
  --text-highlight: light-dark(#fff23688, #b3aa0288);
  --surface: color-mix(in srgb, var(--light) 95%, var(--secondary));
  --muted: color-mix(in srgb, var(--darkgray) 80%, var(--gray));
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans TC", sans-serif;
  line-height: 1.9;
  background: var(--light);
  color: var(--darkgray);
  accent-color: var(--secondary);
}

:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }

.theme-toggle {
  border: 0;
  border-radius: .45rem;
  width: 2.5rem;
  height: 2.5rem;
  padding: .625rem;
  font: inherit;
  font-size: 1.25rem;
  line-height: 1;
  color: var(--secondary);
  background: transparent;
  cursor: pointer;
}
.theme-toggle svg { display: block; width: 100%; height: 100%; }
:root[data-theme="light"] .theme-sun,
:root[data-theme="dark"] .theme-moon { display: none; }
.theme-toggle:hover { background: var(--highlight); }
.theme-toggle:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 4px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

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

main,
nav,
.site-footer {
  width: min(100%, 54rem);
  margin-inline: auto;
  padding-inline: 2rem;
  overflow-wrap: anywhere;
}

nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .4rem .5rem;
  padding-block: 1.5rem;
  border-bottom: 1px solid var(--lightgray);
}

nav a {
  border-radius: .45rem;
  padding: .25rem .65rem;
  text-decoration: none;
  font-size: .9rem;
}

nav .site-brand {
  margin-inline-end: auto;
  padding-inline-start: 0;
  font-size: 1.2rem;
  font-weight: 750;
  letter-spacing: -.025em;
  color: var(--dark);
}

nav a:hover,
nav a[aria-current="page"] {
  color: var(--secondary);
}

nav a:not(.site-brand):hover,
nav a:not(.site-brand)[aria-current="page"] {
  background: var(--highlight);
}

main {
  flex: 1;
  padding-block: 3rem 5rem;
}

.site-footer {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .75rem 2rem;
  border-top: 1px solid var(--lightgray);
  padding-block: 1.5rem 2rem;
  font-size: .85rem;
  color: var(--muted);
}

.footer-name {
  margin: 0;
  font-weight: 600;
  letter-spacing: .025em;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links li {
  margin: 0;
}

.footer-links a {
  display: inline-block;
  padding-block: .25rem;
  text-decoration: none;
}

.footer-links a:hover {
  text-decoration: underline;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  color: var(--dark);
  line-height: 1.45;
  scroll-margin-top: 1.5rem;
}

h1 {
  margin: 0 0 1.5rem;
  font-size: clamp(2rem, 4.5vw, 2.8rem);
  letter-spacing: -.035em;
  text-wrap: balance;
}

h2 {
  margin-block: 3rem 1.25rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--lightgray);
  font-size: 1.55rem;
  letter-spacing: -.015em;
}

h3 {
  margin-top: 2rem;
  font-size: 1.2rem;
}

p {
  margin-block: 1.1rem;
}

a {
  color: var(--secondary);
  text-decoration-thickness: 1px;
  text-underline-offset: .25em;
}

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

a:focus-visible {
  outline: 2px solid var(--secondary);
  outline-offset: 4px;
  border-radius: .15rem;
}

li+li {
  margin-top: .35rem;
}

li::marker {
  color: var(--tertiary);
}

img {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: .75rem;
}

article>header {
  margin-bottom: 2rem;
}

article>header h1 {
  margin-bottom: .8rem;
}

.article-description {
  color: var(--muted);
  font-size: 1.1rem;
}

.article-meta,
.article-list time {
  color: var(--muted);
  font-size: .85rem;
  letter-spacing: .025em;
  font-variant-numeric: tabular-nums;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  list-style: none;
  padding: 0;
  margin-block: 1rem 1.5rem;
}

.tag-list li {
  margin: 0;
}

.tag-list a {
  display: inline-block;
  padding: .15rem .7rem;
  border: 1px solid var(--lightgray);
  border-radius: 999px;
  font-size: .8rem;
  text-decoration: none;
  background: var(--surface);
}

.tag-list a:hover {
  background: var(--highlight);
  border-color: var(--tertiary);
}

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

.article-list>li {
  margin: 0;
  padding-block: 1.8rem;
  border-bottom: 1px solid var(--lightgray);
}

.article-list>li:first-child {
  padding-top: .5rem;
}

.article-list h2 {
  margin: 0 0 .5rem;
  border: 0;
  padding: 0;
  font-size: 1.3rem;
}

.article-list h2 a {
  text-decoration: none;
}

.article-list h2 a:hover {
  text-decoration: underline;
}

.article-list p {
  margin: .65rem 0 0;
  font-size: .95rem;
}

code {
  font-family: ui-monospace, "Cascadia Code", "Source Code Pro", monospace;
  font-size: .9em;
}

:not(pre)>code {
  color: var(--secondary);
  background: var(--highlight);
  padding: .15em .35em;
  border-radius: .3rem;
}

pre {
  overflow-x: auto;
  padding: 1.25rem;
  border: 1px solid var(--lightgray);
  border-radius: .65rem;
  line-height: 1.7;
  tab-size: 2;
  background: var(--surface);
}

pre code {
  font-size: .85rem;
}

blockquote {
  margin: 1.75rem 0;
  padding: .35rem 1.25rem;
  border-inline-start: 3px solid var(--tertiary);
  border-radius: 0 .5rem .5rem 0;
  background: var(--surface);
}

blockquote> :first-child {
  margin-top: .5rem;
}

blockquote> :last-child {
  margin-bottom: .5rem;
}

hr {
  border: 0;
  border-block-start: 1px solid var(--lightgray);
  margin-block: 2.5rem;
}

table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: .95rem;
}

th,
td {
  padding: .65rem .9rem;
  border: 1px solid var(--lightgray);
  text-align: start;
}

th {
  background: var(--surface);
  color: var(--dark);
}

mark {
  background: var(--text-highlight);
  color: inherit;
  padding-inline: .15em;
}

.katex-display {
  overflow-x: auto;
  overflow-y: hidden;
  padding-block: .75rem;
}

.katex-error,
.diagram-error {
  color: light-dark(#b42318, #ffb4ab);
}

.diagram {
  margin: 2rem 0;
  overflow-x: auto;
  border: 1px solid var(--lightgray);
  border-radius: .75rem;
  padding: 1.25rem;
  background: var(--surface);
}

.diagram pre {
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent;
  text-align: center;
}

.diagram svg {
  max-width: 100%;
  height: auto;
}

:root[data-theme="dark"] .shiki,
:root[data-theme="dark"] .shiki span {
  color: var(--shiki-dark) !important;
  background-color: var(--shiki-dark-bg) !important;
  font-style: var(--shiki-dark-font-style) !important;
  font-weight: var(--shiki-dark-font-weight) !important;
  text-decoration: var(--shiki-dark-text-decoration) !important;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .shiki,
  :root:not([data-theme]) .shiki span {
    color: var(--shiki-dark) !important;
    background-color: var(--shiki-dark-bg) !important;
    font-style: var(--shiki-dark-font-style) !important;
    font-weight: var(--shiki-dark-font-weight) !important;
    text-decoration: var(--shiki-dark-text-decoration) !important;
  }
}

@media (max-width: 40rem) {

  main,
  nav,
  .site-footer {
    padding-inline: 1.25rem;
  }

  main {
    padding-block: 2rem 3rem;
  }

  nav {
    gap: .4rem .25rem;
    padding-block: 1rem;
  }

  nav a {
    padding-inline: .5rem;
    font-size: .85rem;
  }

  nav .site-brand {
    flex-basis: 100%;
    margin-bottom: .25rem;
  }

  h2 {
    font-size: 1.35rem;
  }

  pre,
  .diagram {
    padding: 1rem;
  }
}