/* Colours follow the Rosé Pine palette: Dawn in light mode, the main variant in dark mode. */
:root {
  --bg: #faf4ed;
  --surface: #fffaf3;
  --overlay: #f2e9e1;
  --text: #575279;
  --muted: #6e6a86;
  --rule: #dfdad9;
  --accent: #286983;
  --accent-soft: #56949f;
  --mark: #907aa9;

  --code-comment: #797593;
  --code-keyword: #286983;
  --code-string: #b4637a;
  --code-function: #6e5a99;
  --code-type: #3e7e8a;
  --code-number: #907aa9;
  --code-error: #b4637a;

  --serif: "Literata", Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --measure: 40rem;
  --space: 1.5rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #191724;
    --surface: #1f1d2e;
    --overlay: #26233a;
    --text: #e0def4;
    --muted: #908caa;
    --rule: #403d52;
    --accent: #9ccfd8;
    --accent-soft: #31748f;
    --mark: #c4a7e7;

    --code-comment: #6e6a86;
    --code-keyword: #31748f;
    --code-string: #f6c177;
    --code-function: #ebbcba;
    --code-type: #9ccfd8;
    --code-number: #c4a7e7;
    --code-error: #eb6f92;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  font-size: 1.125rem;
  line-height: 1.7;
  font-optical-sizing: auto;
  text-rendering: optimizeLegibility;
}

.wrap {
  max-width: var(--measure);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

/* Links */

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 2px;
}

a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--mark);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: 1rem;
  transform: translateY(-200%);
  padding: 0.5rem 0.75rem;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--rule);
  z-index: 10;
}

.skip-link:focus {
  transform: none;
}

/* The element tile: the site's mark, a nod to a chemistry degree. */

.tile {
  display: inline-grid;
  place-content: center;
  border: 2px solid var(--accent);
  border-radius: 3px;
  color: var(--accent);
  font-weight: 600;
  line-height: 1;
  font-variant-ligatures: none;
}

.tile-sm {
  width: 2rem;
  height: 2rem;
  font-size: 0.95rem;
  border-width: 1.5px;
}

.tile-lg {
  flex: none;
  width: 7rem;
  height: 7rem;
  gap: 0.6rem;
  text-align: center;
  background: var(--surface);
}

.tile-symbol {
  font-size: 2.9rem;
  letter-spacing: -0.02em;
}

.tile-name {
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--muted);
  letter-spacing: 0.02em;
}

/* Header and footer */

.site-header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-block: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
}

.site-nav {
  display: flex;
  gap: 1.25rem;
}

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

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--accent);
}

.site-footer {
  margin-top: 5rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.95rem;
}

.site-footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 1.75rem 2.5rem;
}

.site-footer p {
  margin: 0;
}

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* Headings and body text */

h1,
h2,
h3 {
  color: var(--text);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 2.25rem;
  margin: 0 0 0.75rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.4rem;
  margin: 3rem 0 0.75rem;
}

h3 {
  font-size: 1.125rem;
  margin: 2rem 0 0.25rem;
}

.lede {
  margin: 0 0 1.25rem;
  font-size: 1.2rem;
  color: var(--text);
}

.prose > :first-child {
  margin-top: 0;
}

.prose p,
.prose ul,
.prose ol,
.prose pre,
.prose blockquote,
.prose video,
.prose figure {
  margin: 0 0 var(--space);
}

.prose ul,
.prose ol {
  padding-left: 1.25rem;
}

.prose li {
  margin-bottom: 0.5rem;
}

.prose li::marker {
  color: var(--muted);
}

.prose strong {
  font-weight: 600;
}

.prose blockquote {
  padding-left: 1rem;
  border-left: 3px solid var(--rule);
  color: var(--muted);
  font-style: italic;
}

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

.prose img,
.prose video {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--rule);
  border-radius: 4px;
}

/* Code */

code,
pre {
  font-family: var(--mono);
  font-size: 0.85em;
}

:not(pre) > code {
  padding: 0.1em 0.35em;
  background: var(--overlay);
  border-radius: 3px;
  overflow-wrap: anywhere;
}

pre {
  padding: 1rem 1.15rem;
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 4px;
  line-height: 1.55;
}

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

.highlight .c,
.highlight .c1,
.highlight .cm,
.highlight .cs,
.highlight .cp { color: var(--code-comment); font-style: italic; }
.highlight .k,
.highlight .kd,
.highlight .kn,
.highlight .kp,
.highlight .kr,
.highlight .kc,
.highlight .kt,
.highlight .ow { color: var(--code-keyword); }
.highlight .s,
.highlight .s1,
.highlight .s2,
.highlight .sb,
.highlight .sd,
.highlight .sh,
.highlight .si,
.highlight .sx,
.highlight .sr,
.highlight .ss,
.highlight .se { color: var(--code-string); }
.highlight .nf,
.highlight .fm,
.highlight .nb,
.highlight .bp { color: var(--code-function); }
.highlight .nc,
.highlight .nn,
.highlight .nt,
.highlight .na,
.highlight .no { color: var(--code-type); }
.highlight .m,
.highlight .mi,
.highlight .mf,
.highlight .mh,
.highlight .mo,
.highlight .il { color: var(--code-number); }
.highlight .nv,
.highlight .vi,
.highlight .vg,
.highlight .vc { color: var(--text); }
.highlight .err,
.highlight .gd { color: var(--code-error); }
.highlight .gi { color: var(--accent-soft); }

/* Home */

.hero {
  display: flex;
  align-items: flex-start;
  gap: 1.75rem;
  margin: 2.5rem 0 3rem;
}

.hero h1 {
  margin-top: -0.2rem;
}

.home h3 {
  margin-bottom: 0;
}

.home h3 + p {
  margin-top: 0.25rem;
}

/* Post lists */

.post-list,
.prose .post-list {
  margin: 0 0 var(--space);
  padding: 0;
  list-style: none;
}

.post-list li,
.prose .post-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0 1rem;
  margin: 0;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--rule);
}

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

.post-list time {
  color: var(--muted);
  font-size: 0.95rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.year {
  font-size: 1.1rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* Posts and pages */

.post-header,
.page-header {
  margin: 2.5rem 0 2.25rem;
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.25rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}

.post-nav a {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  line-height: 1.4;
}

.post-nav a span {
  color: var(--muted);
  font-size: 0.9rem;
}

.post-nav-next {
  grid-column: 2;
  text-align: right;
}

@media (max-width: 34rem) {
  body {
    font-size: 1.0625rem;
  }

  h1 {
    font-size: 1.85rem;
  }

  .hero {
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 1.5rem;
  }

  .tile-lg {
    width: 5.5rem;
    height: 5.5rem;
    gap: 0.4rem;
  }

  .tile-symbol {
    font-size: 2.2rem;
  }

  .post-nav {
    grid-template-columns: 1fr;
  }

  .post-nav-next {
    grid-column: 1;
    text-align: left;
  }
}