:root {
  --ink: #20211d;
  --ink-soft: rgba(32, 33, 29, 0.64);
  --ink-faint: rgba(32, 33, 29, 0.36);
  --line: rgba(32, 33, 29, 0.16);
  --paper: #f3f0e8;
  --paper-raised: #f7f4ed;
  --signal: #9b4435;
  --display: "Iowan Old Style", Baskerville, "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  width: 100%;
  min-width: 320px;
  height: 100%;
  overflow: hidden;
}

body {
  color: var(--ink);
  background: var(--paper);
  font: 400 10px/1.6 var(--mono);
  text-rendering: optimizeLegibility;
}

a,
button,
summary {
  color: inherit;
  font: inherit;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 1px solid var(--signal);
  outline-offset: -1px;
}

.fs-skip {
  position: fixed;
  z-index: 50;
  top: 8px;
  left: 8px;
  padding: 6px 9px;
  color: var(--paper);
  background: var(--ink);
  transform: translateY(-180%);
}

.fs-skip:focus {
  transform: translateY(0);
}

.fs-topbar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 54px;
  padding: 0 22px;
  border-bottom: 1px solid var(--ink);
}

.fs-brand {
  width: fit-content;
  font: 400 1.75rem/1 var(--display);
  letter-spacing: -0.045em;
  text-decoration: none;
}

.fs-topbar nav {
  display: flex;
  gap: 24px;
}

.fs-topbar nav a {
  color: var(--ink-soft);
  text-decoration: none;
}

.fs-topbar nav a:hover,
.fs-topbar nav a[aria-current="page"] {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.fs-topbar > span {
  justify-self: end;
  color: var(--signal);
}

.fs-workspace {
  display: grid;
  grid-template-columns: 235px minmax(400px, 1fr) 250px;
  height: calc(100vh - 82px);
}

.fs-tree,
.fs-view,
.fs-inspector {
  min-width: 0;
  min-height: 0;
}

.fs-tree {
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--line);
}

.fs-tree > header,
.fs-inspector > header,
.fs-pathbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 38px;
  padding: 0 14px;
  color: var(--ink-faint);
  border-bottom: 1px solid var(--line);
  font-size: 8px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.fs-tree > header strong {
  color: var(--ink-soft);
  font-weight: 400;
  text-transform: none;
}

.tree-list {
  flex: 1;
  padding: 10px 0;
  overflow: auto;
}

.tree-list a,
.tree-list button,
.tree-list summary {
  display: flex;
  gap: 8px;
  align-items: center;
  width: 100%;
  min-height: 28px;
  padding: 5px 13px;
  text-align: left;
  text-decoration: none;
  background: transparent;
  border: 0;
  cursor: pointer;
}

.tree-list summary {
  list-style: none;
  font-weight: 600;
}

.tree-list summary::-webkit-details-marker {
  display: none;
}

.tree-list a:hover,
.tree-list button:hover {
  background: rgba(32, 33, 29, 0.045);
}

.tree-list button[aria-selected="true"] {
  color: var(--signal);
  background: rgba(155, 68, 53, 0.06);
}

.tree-list button span,
.tree-list a span,
.tree-list summary span {
  width: 18px;
  color: var(--ink-faint);
  font-size: 8px;
}

.tree-list button[aria-selected="true"] span {
  color: var(--signal);
}

.tree-list small {
  margin-left: auto;
  color: var(--ink-faint);
  font-size: 8px;
}

.tree-children button {
  padding-left: 34px;
}

.fs-tree > footer {
  padding: 12px 14px;
  color: var(--ink-faint);
  border-top: 1px solid var(--line);
  font-size: 8px;
}

.fs-tree > footer p + p {
  margin-top: 3px;
}

.fs-view {
  display: flex;
  flex-direction: column;
  background: var(--paper-raised);
}

.fs-pathbar span:first-child {
  overflow: hidden;
  color: var(--ink-soft);
  text-overflow: ellipsis;
  text-transform: none;
  white-space: nowrap;
}

.fs-documents {
  position: relative;
  flex: 1;
  overflow: auto;
}

.fs-documents::after {
  content: "[3.14]";
  position: absolute;
  right: 24px;
  bottom: 20px;
  color: rgba(155, 68, 53, 0.16);
  font-size: 8px;
}

.fs-document {
  width: min(820px, calc(100% - 80px));
  margin: 0 auto;
  padding: clamp(54px, 8vh, 92px) 0 70px;
}

.file-heading > span {
  color: var(--ink-faint);
  font-size: 8px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.file-heading h1 {
  margin-top: 12px;
  padding-bottom: 18px;
  font: 400 clamp(2.1rem, 4vw, 3.7rem)/0.95 var(--display);
  letter-spacing: -0.045em;
  border-bottom: 1px solid var(--ink);
}

.file-lede {
  max-width: 650px;
  margin-top: 28px;
  color: var(--ink-soft);
  font: 400 1.05rem/1.55 var(--display);
}

.file-fields {
  margin-top: 42px;
  border-top: 1px solid var(--line);
}

.file-fields div {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 18px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
}

.file-fields dt {
  color: var(--ink-faint);
  font-size: 8px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.file-fields dd {
  color: var(--ink-soft);
}

.signal {
  color: var(--signal) !important;
}

code {
  color: var(--ink);
  font-family: var(--mono);
}

.file-note {
  max-width: 650px;
  margin-top: 34px;
  padding-left: 14px;
  color: var(--ink-faint);
  border-left: 1px solid var(--signal);
  font-size: 8px;
  line-height: 1.8;
}

.letter-document blockquote {
  max-width: 700px;
  margin-top: clamp(52px, 10vh, 110px);
  color: var(--signal);
  font: 400 clamp(1.05rem, 2vw, 1.45rem)/1.75 var(--mono);
}

.letter-document .file-note {
  margin-top: clamp(50px, 9vh, 96px);
}

.fs-inspector {
  overflow: auto;
  border-left: 1px solid var(--line);
}

.fs-inspector > section {
  padding: 18px 14px 22px;
  border-bottom: 1px solid var(--line);
}

.fs-inspector h2 {
  overflow-wrap: anywhere;
  font: 400 1.05rem/1.25 var(--display);
}

.fs-inspector dl {
  margin-top: 18px;
  border-top: 1px solid var(--line);
}

.fs-inspector dl div {
  display: grid;
  grid-template-columns: 65px 1fr;
  gap: 10px;
  padding: 7px 0;
  border-bottom: 1px solid rgba(32, 33, 29, 0.1);
}

.fs-inspector dt,
.fs-format > span {
  color: var(--ink-faint);
  font-size: 8px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.fs-inspector dd {
  color: var(--ink-soft);
  font-size: 8px;
}

.fs-format {
  padding: 18px 14px;
}

.fs-format pre {
  margin-top: 16px;
  color: var(--ink-soft);
  font: 400 8px/1.75 var(--mono);
}

.fs-format p {
  margin-top: 18px;
  color: var(--ink-faint);
  font-size: 8px;
  line-height: 1.75;
}

.fs-statusbar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  height: 28px;
  padding: 0 12px;
  color: var(--ink-faint);
  border-top: 1px solid var(--ink);
  font-size: 8px;
}

.fs-statusbar span:nth-child(2) {
  justify-self: center;
}

.fs-statusbar span:last-child {
  justify-self: end;
}

[hidden] {
  display: none !important;
}

@media (max-width: 900px) {
  .fs-workspace {
    grid-template-columns: 210px minmax(0, 1fr);
  }

  .fs-inspector {
    display: none;
  }
}

@media (max-width: 620px) {
  html,
  body {
    height: auto;
    overflow: auto;
  }

  .fs-topbar {
    grid-template-columns: 1fr auto;
    height: auto;
    min-height: 54px;
    padding: 12px 16px;
  }

  .fs-topbar nav {
    gap: 12px;
  }

  .fs-topbar > span {
    display: none;
  }

  .fs-workspace {
    display: block;
    height: auto;
  }

  .fs-tree {
    max-height: 44vh;
    border-right: 0;
    border-bottom: 1px solid var(--ink);
  }

  .fs-view {
    min-height: 54vh;
  }

  .fs-document {
    width: calc(100% - 36px);
    padding: 42px 0 54px;
  }

  .file-fields div {
    grid-template-columns: 100px 1fr;
  }

  .fs-statusbar {
    position: static;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
  }
}