/* Blog pages: the same look as the landing page (assets/home/home.css).
   Keep the tokens below in sync with it. */

:root {
  --bg: #050506;
  --surface: #0c0c0e;
  --surface-2: #131316;
  --fg: #f2f2ef;
  --text: #cfcfcc;
  --muted: #8d8d93;
  --line: rgba(255, 255, 255, 0.1);
  --accent: #5ec8ff;
  --sans: 'Geist', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'Geist Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --gutter: clamp(16px, 4vw, 48px);
  --measure: 720px;
  color-scheme: dark;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  /* A faint blue glow at the top of every page, under the particles. */
  background:
    radial-gradient(1100px 520px at 50% -160px, rgba(94, 200, 255, 0.07), transparent 70%),
    var(--bg);
  color: var(--text);
  font: 400 17px/1.7 var(--sans);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 1px solid var(--accent);
  outline-offset: 3px;
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.dim {
  color: var(--muted);
}

.skip {
  position: absolute;
  left: var(--gutter);
  top: -40px;
  z-index: 20;
  padding: 8px 12px;
  background: var(--accent);
  color: var(--bg);
  font: 500 12px/1 var(--mono);
}

.skip:focus {
  top: 12px;
}

.inline-link {
  border-bottom: 1px solid var(--accent);
}

/* Particle sky (assets/js/stars.js) ------------------------------------------ */

.sky {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  /* Hide the particles behind the reading column; --sky-centre (set by the
     script) lets a few through at the top of the page. */
  --col: 820px;
  --sky-centre: 0.5;
  -webkit-mask-image: linear-gradient(
    to right,
    #000 0,
    #000 calc(50% - var(--col) / 2 - 120px),
    rgba(0, 0, 0, var(--sky-centre)) calc(50% - var(--col) / 2),
    rgba(0, 0, 0, var(--sky-centre)) calc(50% + var(--col) / 2),
    #000 calc(50% + var(--col) / 2 + 120px),
    #000 100%
  );
  mask-image: linear-gradient(
    to right,
    #000 0,
    #000 calc(50% - var(--col) / 2 - 120px),
    rgba(0, 0, 0, var(--sky-centre)) calc(50% - var(--col) / 2),
    rgba(0, 0, 0, var(--sky-centre)) calc(50% + var(--col) / 2),
    #000 calc(50% + var(--col) / 2 + 120px),
    #000 100%
  );
}

[data-layout='page'] .sky {
  --col: 780px;
}

/* Posts: the clear band also covers the table of contents on the right. */
[data-layout='post'] .sky {
  --col: 780px;
}

@media (min-width: 1341px) {
  [data-layout='post'] .sky {
    -webkit-mask-image: linear-gradient(
      to right,
      #000 0,
      #000 calc(50% - 390px - 120px),
      rgba(0, 0, 0, var(--sky-centre)) calc(50% - 390px),
      rgba(0, 0, 0, var(--sky-centre)) calc(50% + 390px + 64px + 260px),
      #000 calc(50% + 390px + 64px + 260px + 120px),
      #000 100%
    );
    mask-image: linear-gradient(
      to right,
      #000 0,
      #000 calc(50% - 390px - 120px),
      rgba(0, 0, 0, var(--sky-centre)) calc(50% - 390px),
      rgba(0, 0, 0, var(--sky-centre)) calc(50% + 390px + 64px + 260px),
      #000 calc(50% + 390px + 64px + 260px + 120px),
      #000 100%
    );
  }
}

.bar,
.main,
.foot {
  position: relative;
  z-index: 1;
}

/* Top bar (same as the landing page) --------------------------------------- */

.bar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 18px var(--gutter);
  font: 500 12px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: linear-gradient(var(--bg) 70%, rgba(5, 5, 6, 0));
}

.bar__mark {
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--fg);
}

.bar__mark span {
  color: var(--accent);
}

.bar__nav {
  display: flex;
  gap: 24px;
  margin-left: auto;
}

.bar__nav a {
  color: var(--muted);
  transition: color 0.2s;
}

.bar__nav a:hover,
.bar__nav a[aria-current='page'] {
  color: var(--fg);
}

.bar__nav a[aria-current='page'] {
  box-shadow: 0 1px 0 var(--accent);
}

.main {
  flex: 1;
  width: 100%;
  padding: 0 var(--gutter);
}

/* Shared pieces --------------------------------------------------------------- */

.label {
  margin: 0;
  font: 500 12px/1.6 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.label a:hover {
  color: var(--fg);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font: 400 12px/1.2 var(--mono);
  letter-spacing: 0.04em;
  color: var(--text);
  transition: border-color 0.2s, color 0.2s;
}

.chip:hover {
  border-color: var(--accent);
  color: var(--fg);
}

.chip__count {
  color: var(--muted);
}

.chips--large .chip {
  padding: 10px 16px;
  font-size: 13px;
}

/* Listings: blog, archive, tags --------------------------------------------- */

.listing {
  max-width: 960px;
  margin: 0 auto;
  padding: 10vh 0 14vh;
}

.listing__head {
  display: grid;
  gap: 20px;
  margin-bottom: 56px;
}

.listing__title {
  margin: 0;
  color: var(--fg);
  font-weight: 500;
  font-size: clamp(48px, 8vw, 104px);
  line-height: 0.95;
  letter-spacing: -0.05em;
}

.listing__lede {
  margin: 0;
  max-width: 46ch;
  font-size: 19px;
  line-height: 1.5;
}

.filter input {
  width: min(100%, 420px);
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--fg);
  font: 400 13px/1.2 var(--mono);
  letter-spacing: 0.02em;
}

.filter input::placeholder {
  color: var(--muted);
}

.year {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.year__label {
  margin: 0;
  padding-top: 18px;
  font: 500 12px/1.6 var(--mono);
  letter-spacing: 0.08em;
  color: var(--accent);
}

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

.row__link {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: baseline;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  transition: padding 0.3s ease;
}

.rows > .row:last-child .row__link {
  border-bottom: 1px solid var(--line);
}

.row__date {
  font: 400 12px/1.6 var(--mono);
  color: var(--muted);
}

.row__body {
  display: grid;
  gap: 4px;
}

.row__title {
  color: var(--fg);
  font-size: 19px;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.row__desc {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.5;
}

.row__tags {
  margin-top: 4px;
  font: 400 11px/1.4 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.row__arrow {
  color: var(--muted);
  transition: transform 0.3s ease, color 0.3s ease;
}

.row__link:hover {
  padding-left: 10px;
}

.row__link:hover .row__arrow {
  color: var(--accent);
  transform: translateX(4px);
}

.empty {
  color: var(--muted);
  font: 400 13px/1.6 var(--mono);
}

/* Articles: posts and pages -------------------------------------------------- */

.article {
  position: relative;
  max-width: var(--measure);
  margin: 0 auto;
  padding: 8vh 0 12vh;
}

.article__head {
  display: grid;
  gap: 20px;
  margin-bottom: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.article__head .label {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
}

.article__title {
  margin: 0;
  color: var(--fg);
  font-weight: 500;
  font-size: clamp(34px, 5.2vw, 60px);
  line-height: 1.04;
  letter-spacing: -0.04em;
  text-wrap: balance;
}

.article__lede {
  margin: 0;
  font-size: 20px;
  line-height: 1.5;
  color: var(--text);
}

.article__foot {
  display: grid;
  gap: 40px;
  margin-top: 64px;
  padding-top: 32px;
  border-top: 1px solid var(--line);
}

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.pager__link {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  transition: border-color 0.2s;
}

.pager__link:hover {
  border-color: var(--accent);
}

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

.pager__dir {
  font: 500 11px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.pager__title {
  color: var(--fg);
  line-height: 1.35;
}

.comments {
  margin-top: 64px;
}

/* Table of contents: a column to the right of the text on wide screens ---------- */

.toc {
  position: absolute;
  top: 0;
  left: calc(100% + 64px);
  height: 100%;
  width: 240px;
}

.toc[hidden] {
  display: none;
}

.toc__inner {
  position: sticky;
  top: 96px;
  padding-top: 8vh;
}

.toc__title {
  margin: 0 0 12px;
  font: 500 11px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  line-height: 1.4;
  border-left: 1px solid var(--line);
}

.toc__list a {
  display: block;
  padding: 6px 0 6px 14px;
  margin-left: -1px;
  border-left: 1px solid transparent;
  color: var(--muted);
  transition: color 0.2s, border-color 0.2s;
}

.toc__list .is-sub a {
  padding-left: 26px;
}

.toc__list a:hover {
  color: var(--fg);
}

.toc__list a.is-active {
  color: var(--fg);
  border-left-color: var(--accent);
}

@media (max-width: 1340px) {
  .toc {
    display: none;
  }
}

/* Prose --------------------------------------------------------------------------- */

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

.prose p,
.prose ul,
.prose ol,
.prose blockquote,
.prose table,
.prose figure {
  margin: 0 0 1.3em;
}

.prose h2,
.prose h3,
.prose h4 {
  color: var(--fg);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.025em;
  scroll-margin-top: 96px;
}

.prose h2 {
  margin: 2.2em 0 0.7em;
  font-size: 30px;
}

.prose h3 {
  margin: 1.9em 0 0.6em;
  font-size: 23px;
}

.prose h4 {
  margin: 1.6em 0 0.5em;
  font-size: 19px;
}

.prose a {
  color: var(--fg);
  border-bottom: 1px solid rgba(94, 200, 255, 0.5);
  transition: border-color 0.2s, color 0.2s;
  overflow-wrap: anywhere;
}

.prose a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.prose strong {
  color: var(--fg);
  font-weight: 600;
}

.prose ul,
.prose ol {
  padding-left: 1.3em;
}

.prose li {
  margin-bottom: 0.35em;
}

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

.prose hr {
  margin: 3em 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.prose blockquote {
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--accent);
  color: var(--muted);
}

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

.prose img,
.prose video {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 2em auto;
  border-radius: 10px;
}

.prose img[src$='.svg'] {
  padding: 24px;
  background: #f2f2ef;
}

.prose table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
  font-size: 15px;
}

.prose th,
.prose td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.prose th {
  color: var(--fg);
  font-weight: 500;
}

.prose code {
  font-family: var(--mono);
  font-size: 0.86em;
}

.prose :not(pre) > code {
  padding: 2px 6px;
  border-radius: 6px;
  background: var(--surface-2);
  color: var(--fg);
}

/* Code blocks: the header (language + copy) is added by blog.js. */
.prose div.highlighter-rouge {
  margin: 1.6em 0;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface);
  overflow: hidden;
}

.code__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px 8px 16px;
  border-bottom: 1px solid var(--line);
  font: 500 11px/1 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.code__copy {
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: none;
  color: var(--muted);
  font: inherit;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.code__copy:hover {
  color: var(--fg);
  border-color: var(--accent);
}

.prose pre.highlight {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.6;
  tab-size: 2;
}

.prose pre code {
  font-size: inherit;
}

.footnotes {
  margin-top: 3em;
  font-size: 15px;
  color: var(--muted);
}

/* Footer ------------------------------------------------------------------------------ */

.foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 24px var(--gutter) 40px;
  border-top: 1px solid var(--line);
  font: 400 11px/1.4 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.foot__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
}

.foot__links a:hover {
  color: var(--fg);
}

/* Small screens -------------------------------------------------------------------------- */

@media (max-width: 720px) {
  body {
    font-size: 16px;
  }

  .bar {
    gap: 16px;
  }

  .bar__nav {
    gap: 14px;
    font-size: 11px;
    letter-spacing: 0.06em;
  }

  .listing {
    padding-top: 6vh;
  }

  .year {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }

  .year__label {
    padding-top: 0;
  }

  .row__link {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 6px 12px;
  }

  .row__date {
    grid-column: 1 / -1;
  }

  .article {
    padding-top: 5vh;
  }

  .article__lede {
    font-size: 18px;
  }

  .prose h2 {
    font-size: 25px;
  }

  .prose h3 {
    font-size: 20px;
  }

  .prose pre.highlight {
    font-size: 13px;
    padding: 14px 16px;
  }

  .pager {
    grid-template-columns: minmax(0, 1fr);
  }

  .pager__link--next {
    grid-column: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .row__link,
  .row__arrow {
    transition: none;
  }
}