/* The story in its interfaces: Slack, Claude Code, a Markdown editor and
   GitHub, morphing into each other as the narration scrolls.

   Two layouts share this markup.
   - Stacked (phones, short windows, reduced motion, no JS): the title,
     then each window in the text with every message showing.
   - Pinned (html.mx-pinned, set by morph.js from 1100px wide and 640px
     tall with motion allowed): the title and narration run down the left
     on 9 of 24 columns; the windows share one sticky spot on the other 15,
     out to the content edge.

   One spacing scale (4px steps) and one in-window type scale (12, 13, 15,
   20) serve every interface. Interfaces keep their own light colours in
   both schemes, as the apps' default themes do; the narration follows the
   site's scheme. */

.mx-post {
  --s1: 4px;
  --s2: 8px;
  --s3: 12px;
  --s4: 16px;
  --s5: 24px;
  --s6: 32px;
  --s7: 48px;

  --t-meta: 12px;   /* chips, dates, status bars */
  --t-code: 13px;   /* code, tool rows, file trees, secondary UI */
  --t-body: 15px;   /* messages and UI text */
  --t-title: 20px;  /* the largest text inside a window */

  --mx-radius: 12px;
  /* Corners of parts inside the window's 1px border. */
  --mx-radius-in: calc(var(--mx-radius) - 1px);
  --mx-ease: cubic-bezier(0.32, 0.72, 0, 1);
  --mx-ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --mx-ui: Lato, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mx-sans: system-ui, -apple-system, "Segoe UI", sans-serif;
  --mx-mono: ui-monospace, "SF Mono", Menlo, monospace;
}

/* ---------- Title and narration ---------- */

/* This post's title is its own size: the feature title's 104px pushed the
   first window below the fold. */
.mx-post .post__title {
  grid-column: auto;
  font-size: clamp(2.125rem, 4vw, 3.5rem);
  line-height: 1;
  text-wrap: balance;
}
.mx-post .post__head { gap: var(--s4); }

.mx-beat > p {
  max-width: 26em;
  font-family: var(--serif);
  font-size: 20px;
  line-height: 30px;
  font-synthesis: none;
  text-wrap: pretty;
}
.mx-beat > p + p { margin-top: var(--s4); }

.mx-post .mx .cms-h2 {
  max-width: 26em;
  margin: 0 0 var(--s3);
  font-size: 20px;
  line-height: 24px;
  text-wrap: balance;
}

/* Stacked rhythm: beats sit a paragraph apart, headings open a new part. */
.mx > * + * { margin-top: var(--s4); }
.mx > .mx-win, .mx > .mx-win + * { margin-top: var(--s6); }
.mx > .mx-beat:has(> .cms-h2) { margin-top: var(--s7); }
.mx-beat--head + * { margin-top: var(--s6); }

/* The end, back on the site's paper. */
.mx-after { margin-top: var(--s7); }
.mx-after > p {
  max-width: 26em;
  font-family: var(--serif);
  font-size: 20px;
  line-height: 30px;
  font-synthesis: none;
  text-wrap: pretty;
}
.mx-after > * + * { margin-top: var(--s4); }
@media (max-width: 699px) {
  .mx-post .post__dek { line-height: 31px; }
}

/* ---------- The window: one skeleton, four skins ---------- */

.mx-win {
  --mx-win-h: 600px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  overflow: hidden;
  margin: 0;
  border-radius: var(--mx-radius);
  /* Forced-colors mode drops shadows; the transparent border still draws
     the window's edge there. */
  border: 1px solid transparent;
  box-shadow: 0 0 0 1px rgb(0 0 0 / 0.1), 0 16px 48px -16px rgb(0 0 0 / 0.28);
  font-size: var(--t-body);
  line-height: 22px;
  -webkit-font-smoothing: antialiased;
}
/* Zero-specificity reset, so a part's own margins never need !important. */
.mx-win :where(p, ul, ol, pre, figure) { margin: 0; padding: 0; }
.mx-win :where(ul, ol) { list-style: none; }

.mx-side { display: flex; min-width: 0; }
/* During a morph each part is pictured on its own, outside the window's
   clip, so parts with their own background carry the window's corners. */
.mx-side { border-radius: var(--mx-radius-in) 0 0 var(--mx-radius-in); overflow: hidden; }
.mx-head { border-top-right-radius: var(--mx-radius-in); }
.mx-compose { border-bottom-right-radius: var(--mx-radius-in); }
.mx-win--gh .mx-head { border-top-left-radius: var(--mx-radius-in); }
@media (max-width: 699px) {
  .mx-head { border-top-left-radius: var(--mx-radius-in); }
  .mx-compose { border-bottom-left-radius: var(--mx-radius-in); }
}
.mx-nav { flex: 1; min-width: 0; padding: var(--s3) var(--s2); }
.mx-nav li {
  display: flex;
  align-items: center;
  gap: var(--s2);
  height: 28px;
  padding-inline: var(--s2);
  border-radius: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mx-main {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  grid-template-columns: minmax(0, 1fr);
  min-width: 0;
}
.mx-head { display: flex; align-items: center; gap: var(--s2); min-width: 0; }
.mx-head__title { font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mx-feed { min-height: 0; }
.mx-col { display: flex; flex-direction: column; }
/* Wide code and diffs scroll inside their own box instead of widening
   the window. */
.mx-col > *, .mx-msg__in, .mx-msg__in > div { min-width: 0; }

/* Earlier conversation sits back, so the new messages read first. */
.mx-msg--old, .mx-day--old { opacity: 0.5; }

.mx-av {
  flex: none;
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  font-weight: 700;
  font-size: var(--t-body);
}
.mx-av--cofounder { background: #7a8f6e; }
.mx-av--ceo { background: #b58a6a; }
.mx-av--jason { background: #1d1c1d; color: #fff; }
.mx-nav .mx-av, .mx-head .mx-av { width: 20px; height: 20px; border-radius: 4px; }

.mx-chip {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding-inline: var(--s2);
  border-radius: 999px;
  font: 500 var(--t-meta)/1 var(--mx-sans);
  white-space: nowrap;
}

/* Icons come from the sprite at the top of the page. */
.mx-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.mx-i { flex: none; width: 16px; height: 16px; stroke-width: 2.25; }
.mx-i--s { width: 14px; height: 14px; stroke-width: 2.6; }
/* Drawn strokes near 1.5px beside regular text, 2px beside the bold tab. */
.mx-gh-tabs .is-on .mx-i { stroke-width: 3; }
.mx-chip .mx-i { margin-right: var(--s1); }
.mx-av .mx-i { width: 60%; height: 60%; color: #fff; }

/* ---------- Slack ---------- */

.mx-win--slack { --mx-win-h: 520px; font-family: var(--mx-ui); background: #fff; color: #1d1c1d; }
.mx-win--slack .mx-side { width: 248px; background: #3f0e40; color: #cfc3cf; }
.mx-rail {
  display: grid;
  align-content: start;
  justify-items: center;
  gap: var(--s3);
  width: 48px;
  padding-top: var(--s3);
  background: #2b0a2c;
}
.mx-rail__ws {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: #e8dfe8;
  color: #3f0e40;
  font-weight: 900;
}
.mx-rail__btn {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  color: #cfc3cf;
}
.mx-rail__btn.is-on { background: rgb(255 255 255 / 0.2); color: #fff; }
.mx-nav__ws {
  display: flex;
  align-items: center;
  gap: var(--s1);
  height: 32px;
  margin-bottom: var(--s3);
  padding-inline: var(--s2);
  color: #fff;
  font-weight: 900;
}
.mx-nav__ws svg { width: 12px; height: 12px; }
.mx-nav__h { padding: var(--s2) var(--s2) var(--s1); font-size: var(--t-code); font-weight: 700; }
.mx-nav__hash { width: 12px; opacity: 0.7; }
.mx-win--slack .mx-nav li.is-on { background: #1164a3; color: #fff; }

.mx-win--slack .mx-head { height: 48px; padding-inline: var(--s4); border-bottom: 1px solid #e2e2e2; }
.mx-head__tools { display: flex; gap: var(--s3); margin-left: auto; color: #616061; }
.mx-win--slack .mx-col { justify-content: flex-end; padding: var(--s3) var(--s4); }
.mx-day {
  position: relative;
  display: grid;
  place-items: center;
  margin-block: var(--s2);
}
.mx-day::before { content: ""; position: absolute; inset: 50% 0 auto; border-top: 1px solid #e2e2e2; }
.mx-day span {
  position: relative;
  padding: var(--s1) var(--s3);
  border: 1px solid #e2e2e2;
  border-radius: 999px;
  background: #fff;
  font-size: var(--t-meta);
  line-height: 16px;
  font-weight: 700;
}
.mx-win--slack .mx-msg__in { display: flex; gap: var(--s2); padding-block: var(--s1); }
.mx-who { font-weight: 900; }

.mx-win--slack .mx-compose { padding: 0 var(--s4) var(--s4); }
/* Slack keeps a line under the composer for who is typing. The line is
   always there, empty, so a reply on its way never moves the composer. */
.mx-typing { display: none; }
.mx-pinned .mx-win--slack .mx-compose { padding-bottom: var(--s1); }
.mx-pinned .mx-typing {
  display: flex;
  align-items: center;
  gap: var(--s1);
  height: 20px;
  padding-inline: var(--s1);
  font-size: var(--t-meta);
  color: #616061;
  opacity: 0;
  transition: opacity 150ms ease-out;
}
.mx-pinned .mx-typing.is-on { opacity: 1; }
.mx-typing strong { font-weight: 700; color: #1d1c1d; }
.mx-typing__dots { display: inline-flex; gap: 2px; margin-right: var(--s1); }
.mx-typing__dots i {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: currentColor;
  animation: mx-dot 1s ease-in-out infinite;
}
.mx-typing__dots i:nth-child(2) { animation-delay: 150ms; }
.mx-typing__dots i:nth-child(3) { animation-delay: 300ms; }
@keyframes mx-dot { 0%, 60%, 100% { opacity: 0.3; } 30% { opacity: 1; } }
.mx-win--slack .mx-compose__box {
  display: grid;
  gap: var(--s4);
  padding: var(--s3);
  border: 1px solid #bbbabb;
  border-radius: 8px;
  color: #868686;
}
.mx-compose__tools { display: flex; align-items: center; gap: var(--s3); color: #616061; }
.mx-aa { font-size: var(--t-code); font-weight: 700; line-height: 16px; }
/* The send button is drawn, not live: muted, so it doesn't ask for a click. */
.mx-compose__tools b {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  margin-left: auto;
  border-radius: 6px;
  background: #ebebeb;
  color: #9b9b9b;
}

.mx-file-card {
  display: inline-flex;
  align-items: center;
  gap: var(--s3);
  margin-top: var(--s2);
  padding: var(--s2) var(--s4) var(--s2) var(--s2);
  border: 1px solid #dddddd;
  border-radius: 8px;
  font-size: var(--t-code);
  line-height: 16px;
}
.mx-file-card__icon {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  background: #1d1c1d;
  color: #fff;
  font: 700 var(--t-meta)/1 var(--mx-sans);
}
.mx-file-card strong { display: block; }
.mx-file-card__meta { display: block; color: #616061; font-size: var(--t-meta); }
.mx-win--slack .mx-msg__in p:not(.mx-who) + p { margin-top: var(--s2); }

/* ---------- Claude Code ---------- */

.mx-win--code { font-family: var(--mx-sans); background: #faf9f5; color: #141413; }
.mx-win--code .mx-side { width: 224px; background: #f3f1ea; border-right: 1px solid #e6e3d9; color: #3d3929; }
.mx-nav__brand {
  display: flex;
  align-items: center;
  gap: var(--s2);
  height: 32px;
  padding-inline: var(--s2);
  font-weight: 600;
}
.mx-mark { width: 16px; height: 16px; color: #d97757; }
.mx-nav__new {
  display: flex;
  align-items: center;
  gap: var(--s2);
  height: 32px;
  margin: var(--s3) 0 var(--s4);
  /* Less the 1px border, so the icon and text sit on the same left edge
     as the Claude mark above and the session names below. */
  padding-inline: calc(var(--s2) - 1px);
  border: 1px solid #e0ddd2;
  border-radius: 8px;
  background: #fff;
  font-size: var(--t-code);
  line-height: 16px;
}
.mx-nav__new .mx-i { color: #d97757; }
.mx-win--code .mx-nav li { font-size: var(--t-code); }
.mx-win--code .mx-nav li.is-on { background: #e6e2d6; }

.mx-win--code .mx-head { height: 48px; padding-inline: var(--s5); justify-content: space-between; }
.mx-win--code .mx-head__title { font-weight: 600; }
.mx-win--code .mx-chip { background: #ebe8de; color: #3d3929; }

.mx-win--code .mx-col { width: min(100%, 624px); margin-inline: auto; padding: var(--s4) var(--s5); gap: var(--s4); }
.mx-win--code .mx-msg { line-height: 24px; }
.mx-msg--you .mx-msg__in {
  margin-left: 15%;
  padding: var(--s3) var(--s4);
  border-radius: var(--mx-radius);
  background: #ece9df;
}
.mx-msg--claude .mx-msg__in > * + * { margin-top: var(--s2); }
.mx-clamp {
  display: grid;
  gap: var(--s2);
  max-height: 120px;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(#000 55%, transparent);
  mask-image: linear-gradient(#000 55%, transparent);
}
.mx-more { display: block; margin-top: var(--s1); font-size: var(--t-code); color: #8a8575; }
.mx-h { font-weight: 700; }
.mx-tools { display: grid; gap: var(--s1); font-size: var(--t-code); line-height: 20px; color: #6b6656; }
.mx-tools li::before { content: "●"; margin-right: var(--s2); font-size: 8px; color: #7aa35a; vertical-align: 2px; }
.mx-tools span { font-weight: 600; color: #3d3929; margin-right: var(--s1); }
.mx-tools em { font-style: normal; color: #5f8a40; margin-left: var(--s1); }
.mx-code {
  padding: var(--s3) var(--s4);
  overflow-x: auto;
  border-radius: 8px;
  background: #f0eee6;
  font: var(--t-code)/20px var(--mx-mono);
  color: #3d3929;
}
.mx-code mark { background: #f5d9c9; color: inherit; border-radius: 2px; }

/* Code that scrolls sideways gets a slim scrollbar of its own; the page
   keeps the native one. */
.mx-code::-webkit-scrollbar, .mx-gh-diff pre::-webkit-scrollbar { width: 8px; height: 8px; }
.mx-code::-webkit-scrollbar-thumb, .mx-gh-diff pre::-webkit-scrollbar-thumb { background: rgba(0, 0, 0, 0.2); border-radius: 4px; }
.mx-code::-webkit-scrollbar-track, .mx-gh-diff pre::-webkit-scrollbar-track { background: transparent; }
/* The page's own ink scrollbar is inherited from html, and where the
   standard properties are set they win over the -webkit- rules above, so
   the code blocks set them too. */
.mx-code, .mx-gh-diff pre { scrollbar-width: thin; scrollbar-color: rgba(0, 0, 0, 0.2) transparent; }

/* The drawn chrome isn't text to copy: a selection across a window keeps
   the messages and files and skips the labels around them. */
.mx-side, .mx-head, .mx-compose, .mx-tools, .mx-day, .mx-more, .mx-prcard__btn,
.mx-thinking, .mx-gh-tabs, .mx-gh-merge-row, .mx-file, .mx-av { -webkit-user-select: none; user-select: none; }
.mx-marker { background: var(--marker, #ffe45c); color: inherit; padding-inline: 2px; }
.mx-prcard {
  display: flex;
  align-items: center;
  gap: var(--s3);
  padding: var(--s3);
  border: 1px solid #e0ddd2;
  border-radius: 8px;
  background: #fff;
  font-size: var(--t-code);
  line-height: 20px;
}
.mx-prcard svg { flex: none; width: 16px; height: 16px; color: #1a7f37; }
.mx-prcard__n { color: #6b6656; }
/* A drawn button: quiet, so it doesn't ask for a click it can't take. */
.mx-prcard__btn {
  flex: none;
  margin-left: auto;
  padding: 2px var(--s2);
  border: 1px solid #e0ddd2;
  border-radius: 6px;
  color: #6b6656;
  font-size: var(--t-meta);
}

.mx-win--code .mx-compose { padding: 0 var(--s5) var(--s4); }
.mx-win--code .mx-compose__box {
  display: grid;
  gap: var(--s4);
  width: min(100%, 576px);
  margin-inline: auto;
  padding: var(--s3) var(--s3) var(--s3) var(--s4);
  border: 1px solid #e0ddd2;
  border-radius: var(--mx-radius);
  background: #fff;
  box-shadow: 0 4px 16px -8px rgb(0 0 0 / 0.14);
  color: #8a8575;
}
.mx-win--code .mx-compose__tools { color: #6b6656; }
.mx-win--code .mx-compose__tools b { border-radius: 8px; background: #efe9e4; color: #b0a796; }

/* ---------- Markdown editor ---------- */

.mx-win--md { --mx-win-h: 640px; font-family: var(--mx-mono); background: #fbfaf7; color: #2b2a26; }
.mx-win--md .mx-side { width: 200px; background: #f1efe9; border-right: 1px solid #e3e0d7; color: #55524a; }
.mx-win--md .mx-nav__h {
  padding: var(--s1) var(--s2) var(--s2);
  font: 600 var(--t-meta)/16px var(--mx-sans);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.mx-tree li { height: 24px; font: var(--t-code)/1 var(--mx-sans); }
.mx-tree__dir { width: 12px; color: #9a968a; }
.mx-tree .mx-i { color: #8f8b7f; }
.mx-tree__file { padding-left: 28px; }
.mx-pinned .mx-tree li.is-shown { background: #e2ded2; color: #2b2a26; }
.mx-win--md .mx-head { height: 40px; gap: 0; background: #f1efe9; border-bottom: 1px solid #e3e0d7; }
.mx-tab {
  display: flex;
  align-items: center;
  height: 100%;
  padding-inline: var(--s4);
  border-right: 1px solid #e3e0d7;
  font: var(--t-code)/1 var(--mx-sans);
  color: #8a867a;
  gap: var(--s2);
}
.mx-pinned .mx-tab.is-shown { background: #fbfaf7; color: #2b2a26; box-shadow: inset 0 2px #d97757; }
.mx-win--md .mx-col { padding: var(--s3) 0 var(--s5); }
.mx-win--md .mx-view + .mx-view { margin-top: var(--s5); }
.mx-file { display: none; }
.mx-lines {
  counter-reset: ln;
  font-size: var(--t-code);
  line-height: 22px;
}
.mx-lines li {
  counter-increment: ln;
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  min-height: 22px;
  padding-right: var(--s4);
  white-space: pre-wrap;
  transition: background-color 200ms ease;
}
.mx-lines li::before { content: counter(ln); padding-right: var(--s4); text-align: right; color: #8f8b7f; }
.mx-md-h { font-weight: 700; color: #b4532f; }
.mx-hl { background: #fff1a8; }
.mx-pinned .mx-hl:not(.is-shown) { background: transparent; }
.mx-win--md .mx-compose { border-top: 1px solid #e3e0d7; background: #f1efe9; }
.mx-status {
  display: flex;
  gap: var(--s4);
  height: 24px;
  align-items: center;
  padding-inline: var(--s3);
  font: var(--t-meta)/1 var(--mx-sans);
  color: #6f6b60;
}
.mx-status__end { margin-left: auto; }

/* Stacked, both files show, each under its name. */
html:not(.mx-pinned) .mx-win--md .mx-head { display: none; }
html:not(.mx-pinned) .mx-file {
  display: block;
  padding: 0 0 var(--s2) var(--s4);
  font: 600 var(--t-meta)/16px var(--mx-sans);
  color: #6f6b60;
}

/* ---------- GitHub ---------- */

.mx-win--gh {
  --mx-win-h: 640px;
  grid-template-columns: minmax(0, 1fr);
  font-family: -apple-system, "Segoe UI", system-ui, sans-serif;
  background: #fff;
  color: #1f2328;
}
.mx-win--gh .mx-side, .mx-win--gh .mx-compose { display: none; }
.mx-win--gh .mx-head {
  display: grid;
  gap: var(--s3);
  padding: var(--s4) var(--s5) 0;
  background: #f6f8fa;
  border-bottom: 1px solid #d1d9e0;
}
.mx-gh-repo { display: flex; align-items: center; gap: var(--s2); color: #59636e; }
.mx-gh-repo svg { width: 16px; height: 16px; }
.mx-gh-repo strong { color: #1f2328; }
.mx-gh-tabs { display: flex; gap: var(--s5); font-size: var(--t-code); color: #59636e; }
.mx-gh-tabs span { display: inline-flex; align-items: center; gap: var(--s2); padding-bottom: var(--s2); }
.mx-gh-tabs .is-on { color: #1f2328; font-weight: 600; box-shadow: inset 0 -2px #fd8c73; }
.mx-win--gh .mx-col { padding: var(--s5); }
.mx-win--gh .mx-view + .mx-view { margin-top: var(--s6); padding-top: var(--s6); border-top: 1px solid #d1d9e0; }
.mx-pinned .mx-win--gh .mx-view + .mx-view { margin-top: 0; padding-top: 0; border-top: 0; }
.mx-gh-title { font-size: var(--t-title); line-height: 28px; }
.mx-gh-title span { color: #59636e; font-weight: 300; }
.mx-gh-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--s2);
  margin-top: var(--s2);
  padding-bottom: var(--s4);
  border-bottom: 1px solid #d1d9e0;
  font-size: var(--t-code);
  color: #59636e;
}
.mx-gh-meta strong { color: #1f2328; }
.mx-gh-meta code {
  padding: 0 6px;
  border-radius: 6px;
  background: #ddf4ff;
  color: #0969da;
  font: var(--t-meta)/20px var(--mx-mono);
}
.mx-gh-badge {
  display: inline-flex;
  align-items: center;
  height: 24px;
  padding-inline: var(--s3);
  border-radius: 999px;
  gap: var(--s1);
  background: #8250df;
  color: #fff;
  font-size: var(--t-meta);
  font-weight: 600;
}
.mx-gh-event { display: flex; gap: var(--s3); margin-top: var(--s4); }
.mx-gh-event .mx-av { border-radius: 50%; }
.mx-gh-comment { flex: 1; border: 1px solid #d1d9e0; border-radius: 6px; font-size: var(--t-code); }
.mx-gh-comment__head { padding: var(--s2) var(--s4); background: #f6f8fa; border-bottom: 1px solid #d1d9e0; color: #59636e; }
.mx-gh-comment__body { padding: var(--s3) var(--s4); }
/* Boxes under a comment line up with the comment, past its 32px avatar. */
.mx-gh-box {
  display: grid;
  gap: var(--s2);
  margin: var(--s4) 0 0 44px;
  padding: var(--s3) var(--s4);
  border: 1px solid #d1d9e0;
  border-radius: 6px;
  font-size: var(--t-code);
}
.mx-gh-box__head { font-weight: 600; }
.mx-gh-box--merged { display: flex; align-items: center; gap: var(--s3); font-weight: 600; }
.mx-gh-box--plain { display: block; margin-left: 0; border: 0; padding-inline: 0; font-weight: 600; }
.mx-ok { color: #1a7f37; font-weight: 700; margin-right: var(--s1); }
.mx-gh-dim { color: #59636e; font-weight: 400; }
.mx-gh-listhead {
  display: flex;
  gap: var(--s3);
  padding: var(--s3) var(--s4);
  border: 1px solid #d1d9e0;
  border-bottom: 0;
  border-radius: 6px 6px 0 0;
  background: #f6f8fa;
  font-size: var(--t-code);
}
.mx-gh-list { border: 1px solid #d1d9e0; border-radius: 0 0 6px 6px; }
.mx-gh-list li { display: flex; gap: var(--s3); padding: var(--s2) var(--s4); border-top: 1px solid #d1d9e0; font-size: var(--t-code); line-height: 20px; }
.mx-gh-list li:first-child { border-top: 0; }
.mx-gh-list strong { font-weight: 600; }
.mx-gh-list .mx-gh-dim { display: block; font-size: var(--t-meta); line-height: 16px; }
.mx-merged { margin-top: 2px; color: #8250df; }
.mx-gh-diff { margin-top: var(--s4); border: 1px solid #d1d9e0; border-radius: 6px; overflow: hidden; }
.mx-gh-diff__file {
  padding: var(--s2) var(--s4);
  background: #f6f8fa;
  border-block: 1px solid #d1d9e0;
  font: 600 var(--t-meta)/16px var(--mx-mono);
}
.mx-gh-diff__file:first-child { border-top: 0; }
.mx-gh-diff pre { padding-block: var(--s2); overflow-x: auto; font: var(--t-code)/20px var(--mx-mono); }
.mx-gh-diff pre code { display: block; width: max-content; min-width: 100%; }

/* Diff lines, in a Claude message and on GitHub. */
.mx-del, .mx-add, .mx-ctx { display: block; padding-inline: var(--s4); }
.mx-del { background: #ffebe9; }
.mx-add { background: #dafbe1; }
.mx-ctx { color: #59636e; }
.mx-diff { padding-inline: 0; }
.mx-diff code { display: block; width: max-content; min-width: 100%; }

/* While a message of mine is being written, the composer holds its text
   on one line and the send button lights up (morph.js). */
.mx-compose__hint { min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mx-compose.is-typing .mx-compose__hint { color: inherit; }
.mx-win--slack .mx-compose.is-typing .mx-compose__hint { color: #1d1c1d; }
.mx-win--code .mx-compose.is-typing .mx-compose__hint { color: #141413; }
.mx-compose__tools b { transition: background-color 120ms ease, color 120ms ease; }
/* The paper plane's weight sits up and right of its box. */
.mx-win--slack .mx-compose__tools b .mx-i { translate: -1px 1px; }
.mx-win--slack .mx-compose.is-typing b { background: #007a5a; color: #fff; }
.mx-win--code .mx-compose.is-typing b { background: #d97757; color: #fff; }

/* Slack's unread badge, on the conversation, until my reply goes out. */
.mx-badge {
  display: none;
  place-items: center;
  min-width: 20px;
  height: 18px;
  margin-left: auto;
  padding-inline: 6px;
  border-radius: 9px;
  background: #e01e5a;
  color: #fff;
  font: 700 var(--t-meta)/1 var(--mx-ui);
}
.mx-pinned .mx-badge.is-shown { display: grid; }

/* Claude at work: the old spark, turning and breathing. */
.mx-thinking { display: none; align-items: center; gap: var(--s2); color: #8a8575; font-size: var(--t-code); }
.mx-thinking.is-on { display: flex; }
.mx-spark { width: 20px; height: 20px; color: #d97757; animation: mx-spark 1.4s ease-in-out infinite; }
@keyframes mx-spark {
  0% { transform: rotate(0deg) scale(0.8); }
  50% { transform: rotate(90deg) scale(1); }
  100% { transform: rotate(180deg) scale(0.8); }
}

/* The editor's file writes itself in, a line at a time, when its view
   first shows. --i is each line's index (morph.js). */
.mx-pinned .mx-view.is-shown .mx-lines li {
  animation: mx-line-in 140ms var(--mx-ease-out) both;
  animation-delay: calc(var(--i, 0) * 18ms);
}
@keyframes mx-line-in { from { opacity: 0; transform: translateX(-4px); } }

/* The first pull request merges on screen: ready, the pointer arrives,
   a press, a spinner, merged. Its resting state is merged, so the
   stacked layout and a page without the script show the outcome. */
.mx-gh-merge-row { position: relative; display: flex; margin-top: var(--s3); }
.mx-gh-mergebtn {
  display: inline-flex;
  align-items: center;
  gap: var(--s2);
  height: 32px;
  padding-inline: var(--s4);
  border-radius: 6px;
  background: #1f883d;
  color: #fff;
  font-weight: 600;
  transition: transform 150ms var(--mx-ease-out), filter 150ms ease-out;
}
.mx-gh-cursor {
  position: absolute;
  left: 120px;
  top: 18px;
  width: 16px;
  height: 20px;
  opacity: 0;
  transform: translate(32px, 24px);
  /* Leaving, it only fades; it slides only on the way in. */
  transition: opacity 150ms ease-out;
  pointer-events: none;
}
.mx-spin {
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 2px solid rgb(255 255 255 / 0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: mx-spin 700ms linear infinite;
}
@keyframes mx-spin { to { transform: rotate(1turn); } }
.mx-gh-badge--open { background: #1f883d; }
/* Both labels share one grid cell, so the button keeps the longer one's
   width while the shorter shows, and never shrinks under the click. */
.mx-gh-mergebtn__labels { display: grid; }
.mx-gh-mergebtn__labels > * {
  grid-area: 1 / 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s2);
}
.mx-when-merging { visibility: hidden; }
[data-merge="merged"] :is(.mx-gh-box--ready, .mx-gh-badge--open, .mx-when-open) { display: none; }
[data-merge]:not([data-merge="merged"]) :is(.mx-gh-box--merged, .mx-gh-badge--merged, .mx-when-merged) { display: none; }
:is([data-merge="aim"], [data-merge="press"]) .mx-gh-cursor {
  opacity: 1;
  transform: none;
  transition: opacity 200ms ease-out, transform 420ms var(--mx-ease-out);
}
[data-merge="merging"] .mx-gh-cursor { transform: none; }
[data-merge="press"] .mx-gh-mergebtn { transform: scale(0.96); filter: brightness(0.9); }
[data-merge="merging"] .mx-gh-mergebtn { filter: brightness(0.9); }
[data-merge="merging"] .mx-when-merging { visibility: visible; }
[data-merge="merging"] .mx-when-ready { visibility: hidden; }

/* ---------- Phones ---------- */

@media (max-width: 699px) {
  .mx-win { grid-template-columns: minmax(0, 1fr); }
  .mx-win .mx-side { display: none; }
  .mx-win--slack .mx-head, .mx-win--code .mx-head { padding-inline: var(--s4); }
  .mx-win--slack .mx-col, .mx-win--code .mx-col { padding: var(--s3) var(--s4); }
  .mx-win--gh .mx-head, .mx-win--gh .mx-col { padding-inline: var(--s4); }
  .mx-win--slack .mx-compose, .mx-win--code .mx-compose { padding: 0 var(--s4) var(--s4); }
  .mx-msg--you .mx-msg__in { margin-left: 8%; }
  .mx-win--code .mx-head .mx-chip { display: none; }
  .mx-gh-box { margin-left: 0; }
  /* Four tabs with icons don't fit a phone's window; Settings goes. */
  .mx-gh-tabs { gap: var(--s4); }
  .mx-gh-tabs span:last-child { display: none; }
}

/* On phones each window after the first waits as a copy of the one before
   and morphs into itself once (morph.js). The copy takes the real window's
   height, so nothing below moves when the swap happens. The real window
   keeps its place in the reading order meanwhile, unseen. */
.mx { position: relative; }
.mx-win.is-waiting {
  position: absolute;
  left: 0;
  right: 0;
  height: 0;
  opacity: 0;
  pointer-events: none;
}
/* Arriving: laid over its copy at full height for the crossfade. */
.mx-win.is-waiting.is-arriving { height: auto; margin-top: 0; }
.mx-ghost .mx-msg, .mx-ghost .mx-day { display: none; }

/* ---------- Pinned layout ---------- */

.mx-pinned .mx {
  display: grid;
  grid-template-columns: minmax(0, 9fr) minmax(0, 15fr);
  grid-template-rows: repeat(var(--mx-rows, 24), auto);
  column-gap: var(--s7);
}
.mx-pinned .mx > * { margin-top: 0; }
.mx-pinned .mx-beat {
  grid-column: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 45svh;
}
/* A beat that changes the interface gets more room than one that adds a
   message, so each morph has time to be seen. */
.mx-pinned .mx-beat--stage { min-height: 70svh; }
.mx-pinned .mx-beat--head {
  justify-content: flex-start;
  min-height: calc(min(520px, 100svh - 128px) + var(--s7));
  /* morph.js lines the title's top up with the window's. */
  padding-top: var(--mx-head-pad, 0px);
}
.mx-pinned .mx-beat--head .post__title { font-size: 40px; line-height: 40px; letter-spacing: -0.03em; }
.mx-pinned .mx-beat--head .post__dek { max-width: none; font-size: 20px; line-height: 28px; }
.mx-pinned .mx-beat:last-of-type { min-height: 60svh; }

.mx-pinned .mx-win {
  grid-column: 2;
  grid-row: 1 / -1;
  position: sticky;
  top: max(96px, calc(50svh - min(var(--mx-win-h), 100svh - 128px) / 2));
  align-self: start;
  grid-template-rows: minmax(0, 1fr);
  height: min(var(--mx-win-h), 100svh - 128px);
}
.mx-pinned .mx-win:not(.is-active) { opacity: 0; pointer-events: none; }

/* Feeds read from the top until they fill the window, then hold the newest
   message at the bottom with older ones running off the top under a fade. */
.mx-pinned .mx-feed {
  position: relative;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(transparent, #000 var(--s7));
  mask-image: linear-gradient(transparent, #000 var(--s7));
}
.mx-pinned .mx-col {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  min-height: 100%;
}
/* The editor and GitHub read from the top and run off the bottom. */
.mx-pinned :is(.mx-win--md, .mx-win--gh) .mx-col { top: 0; bottom: auto; }
.mx-pinned :is(.mx-win--md, .mx-win--gh) .mx-feed {
  -webkit-mask-image: linear-gradient(#000 calc(100% - var(--s7)), transparent);
  mask-image: linear-gradient(#000 calc(100% - var(--s7)), transparent);
}

/* A message waits out of the layout but stays in the accessibility tree,
   then fades up when its beat comes. Only opacity and transform move. */
.mx-pinned .mx-msg:not(.is-shown) {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
.mx-pinned .mx-msg.is-shown { animation: mx-msg-in 200ms var(--mx-ease-out) both; }
/* What's already showing when the page loads doesn't animate in. */
.mx-pinned :is(.mx-msg.is-quiet.is-shown, .mx-view.is-quiet.is-shown .mx-lines li) { animation: none; }
@keyframes mx-msg-in { from { opacity: 0; transform: translateY(8px); } }

/* ---------- The morph ---------- */

/* Only the windows take part; the narration stays live and scrollable. */
:root { view-transition-name: none; }
::view-transition { pointer-events: none; }
::view-transition-group(*) {
  /* The window is already on screen and reshapes in place: ease-in-out. */
  animation-duration: 400ms;
  animation-timing-function: cubic-bezier(0.45, 0, 0.15, 1);
}
/* The frame and its parts reshape over the whole morph, while what is in
   them changes hands in the middle: the old leaves before the new arrives,
   so the two never sit on top of each other. Pictures crossfade at their
   own scale instead of stretching. */
::view-transition-old(*) { animation: 150ms cubic-bezier(0.4, 0, 1, 1) both mx-out; }
::view-transition-new(*) { animation: 220ms cubic-bezier(0.32, 0.72, 0, 1) 170ms both mx-in; }
::view-transition-old(mx-side), ::view-transition-new(mx-side),
::view-transition-old(mx-head), ::view-transition-new(mx-head) {
  height: 100%;
  object-fit: none;
  object-position: left top;
}
::view-transition-old(mx-feed), ::view-transition-new(mx-feed),
::view-transition-old(mx-compose), ::view-transition-new(mx-compose) {
  height: 100%;
  object-fit: none;
  object-position: center bottom;
}
::view-transition-old(mx-frame), ::view-transition-new(mx-frame) {
  height: 100%;
  animation-duration: 400ms;
  animation-delay: 0ms;
}
::view-transition-group(mx-side), ::view-transition-group(mx-head),
::view-transition-group(mx-feed), ::view-transition-group(mx-compose) { overflow: clip; }
@keyframes mx-out { to { opacity: 0; } }
@keyframes mx-in { from { opacity: 0; } }