/* ===== Design tokens ===== */
:root {
  --desk: #d9dbd2;
  --paper: #f4f5f0;
  --ink: #26233a;
  --ink-dim: #5c5872;
  --accent: #8a5a2e;
  --accent2: #3f5d54;
  --rule: #c9cabf;
  --code-bg: #e7e8e1;
  --serif: Georgia, "Iowan Old Style", "Times New Roman", serif;
  --sans: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "SF Mono", "Cascadia Code", Consolas, monospace;
}

:root[data-theme="dark"] {
  --desk: #141319;
  --paper: #232230;
  --ink: #e9e6f2;
  --ink-dim: #a39fb5;
  --accent: #d3985a;
  --accent2: #7fb3a4;
  --rule: #3a3847;
  --code-bg: #1c1b26;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --desk: #141319;
    --paper: #232230;
    --ink: #e9e6f2;
    --ink-dim: #a39fb5;
    --accent: #d3985a;
    --accent2: #7fb3a4;
    --rule: #3a3847;
    --code-bg: #1c1b26;
  }
}

/* ===== Reset ===== */
* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--desk);
  color: var(--ink);
  font-family: var(--sans);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

hr {
  border: none;
  margin: 0;
  padding: 0;
}

/* ===== Paper sheet shell ===== */
.sheet {
  margin: 0 auto;
  background: var(--paper);
  box-shadow: -8px 0 16px -6px rgba(0, 0, 0, .32), 8px 0 16px -6px rgba(0, 0, 0, .32);
  min-height: 100vh;
}

.sheet.home {
  max-width: 760px;
}

.sheet.doc {
  max-width: 980px;
}

/* ===== Top bar (doc pages) ===== */
.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 22px 48px;
  border-bottom: 1px solid var(--rule);
}

.brand {
  font-family: var(--serif);
  font-size: 16px;
  text-decoration: none;
}

.brand b {
  color: var(--accent);
}

.crumb {
  margin: 0;
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.crumb b {
  color: var(--accent2);
  font-weight: 600;
}

/* ===== Doc body grid: in-article TOC + content ===== */
.body-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-width: 0;
}

.body-grid > .intoc,
.body-grid > main.doc-main {
  min-width: 0;
}

.intoc {
  padding: 40px 26px 60px 48px;
  border-right: 1px solid var(--rule);
  position: sticky;
  top: 0;
  align-self: start;
  max-height: 100vh;
  overflow-y: auto;
}

.intoc .label {
  font-size: 10px;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 14px;
}

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

.intoc li {
  position: relative;
}

.intoc a {
  display: block;
  position: relative;
  padding: 7px 0 7px 16px;
  font-size: 13.5px;
  color: var(--ink-dim);
  font-family: var(--serif);
  line-height: 1.5;
  text-decoration: none;
}

.intoc a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 6px;
  height: 1px;
  background: var(--rule);
}

.intoc a:hover {
  color: var(--ink);
}

.intoc li.active > a {
  color: var(--accent);
  font-weight: 700;
}

.intoc li.active > a::before {
  background: var(--accent);
  width: 10px;
}

.intoc li.h3 > a {
  padding-left: 28px;
  font-size: 12.5px;
}

.intoc li.h3 > a::before {
  left: 16px;
}

.intoc .chapter-link {
  display: block;
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-dim);
  text-decoration: none;
  margin-bottom: 22px;
}

.intoc .chapter-link:hover {
  color: var(--accent2);
}

main.doc-main {
  padding: 44px 56px 100px 40px;
  max-width: 760px;
}

@media (max-width: 860px) {
  .body-grid {
    grid-template-columns: 1fr;
  }

  .intoc {
    position: static;
    border-right: none;
    border-bottom: 1px solid var(--rule);
    max-height: none;
  }

  main.doc-main {
    padding: 32px 28px 80px;
  }
}

/* ===== Article typography ===== */
.kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--accent2);
}

h1 {
  font-family: var(--serif);
  font-size: 34px;
  font-weight: 400;
  margin: 8px 0 22px;
  text-wrap: balance;
  line-height: 1.25;
}

.hr-accent {
  width: 48px;
  height: 1px;
  background: var(--accent);
  margin-bottom: 26px;
}

p {
  font-family: var(--serif);
  font-size: 16.5px;
  line-height: 1.9;
  max-width: 60ch;
  margin: 0 0 18px;
}

p.lead::first-letter {
  font-size: 50px;
  float: left;
  line-height: .75;
  padding: 5px 8px 0 0;
  color: var(--accent);
  font-weight: 700;
}

ul.doc-list,
ol.doc-list {
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.85;
  max-width: 60ch;
  padding-left: 22px;
}

ul.doc-list li,
ol.doc-list li {
  margin-bottom: 8px;
}

h2 {
  font-family: var(--serif);
  font-size: 23px;
  font-weight: 400;
  margin: 44px 0 12px;
  scroll-margin-top: 24px;
}

h3 {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 400;
  color: var(--accent2);
  margin: 30px 0 10px;
  scroll-margin-top: 24px;
}

code.inline {
  font-family: var(--mono);
  font-size: .87em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--accent);
}

pre {
  margin: 18px 0;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.75;
  padding: 18px 20px;
  background: var(--code-bg);
  border-left: 3px solid var(--accent);
  overflow-x: auto;
  border-radius: 0 4px 4px 0;
}

pre .k {
  color: var(--accent);
}

pre .v {
  color: var(--accent2);
}

pre .s {
  color: #7a6fb0;
}

pre .c {
  color: var(--ink-dim);
  font-style: italic;
}

/* ===== Demo / preview boxes ===== */
.demo {
  border: 1px solid var(--rule);
  background: var(--desk);
  border-radius: 4px;
  padding: 20px;
  margin: 20px 0;
}

.demo-label {
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 12px;
}

.demo-flex {
  display: flex;
  gap: 10px;
}

.demo-grid {
  display: grid;
  gap: 10px;
}

.demo .box {
  background: var(--paper);
  border: 1px solid var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-size: 13px;
  color: var(--accent2);
  padding: 14px 0;
  min-height: 44px;
}

.demo .box.b2 {
  border-color: var(--accent2);
  color: var(--accent);
}

.demo-flex,
.demo-grid {
  overflow-x: auto;
}

.demo-flex > .box {
  min-width: 64px;
}

.note {
  border-left: 3px solid var(--accent2);
  background: var(--desk);
  padding: 14px 18px;
  margin: 22px 0;
  font-size: 13.5px;
  color: var(--ink-dim);
  line-height: 1.7;
  border-radius: 0 4px 4px 0;
}

.note b {
  color: var(--accent2);
  display: block;
  font-size: 10px;
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-bottom: 6px;
  font-family: var(--sans);
}

table.doc-table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 13.5px;
}

table.doc-table th,
table.doc-table td {
  border: 1px solid var(--rule);
  padding: 9px 12px;
  text-align: left;
}

table.doc-table th {
  background: var(--desk);
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

table.doc-table td {
  font-family: var(--mono);
  font-size: 12.5px;
}

table.doc-table td.d {
  font-family: var(--serif);
  font-size: 13.5px;
}

.next {
  margin-top: 56px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  font-family: var(--serif);
  font-size: 13.5px;
  color: var(--ink-dim);
}

.next a {
  text-decoration: none;
  color: var(--ink-dim);
}

.next a:hover {
  color: var(--accent);
}

/* ===== Home / TOC page ===== */
.masthead {
  text-align: center;
  padding: 56px 64px 0;
}

.sub {
  font-family: var(--serif);
  font-style: italic;
  font-size: 13px;
  color: var(--ink-dim);
}

.rule-thick {
  height: 2px;
  background: var(--ink);
  margin: 26px 64px 8px;
}

.rule-thin {
  height: 1px;
  background: var(--ink);
  margin: 0 64px 36px;
}

.home-body {
  padding: 0 64px 80px;
}

.part {
  margin-bottom: 38px;
}

.part-num {
  font-family: var(--serif);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: .1em;
}

.part-title {
  font-family: var(--serif);
  font-size: 22px;
  margin: 2px 0 14px;
}

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

.entry {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 0;
  font-family: var(--serif);
  font-size: 15.5px;
  text-decoration: none;
  color: var(--ink);
}

.entry .leader {
  flex: 1;
  border-bottom: 1px dotted var(--rule);
  position: relative;
  top: -4px;
}

.entry .page {
  color: var(--ink-dim);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

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

.entry:hover .page {
  color: var(--accent);
}

.foot {
  margin-top: 50px;
  text-align: center;
  padding-bottom: 56px;
  font-family: var(--serif);
  font-style: italic;
  font-size: 12px;
  color: var(--ink-dim);
}

/* ===== Mobile ===== */
@media (max-width: 640px) {
  .sheet {
    box-shadow: none;
  }

  .top {
    padding: 16px 20px;
    flex-wrap: wrap;
    gap: 6px;
  }

  .intoc {
    padding: 24px 20px 32px;
  }

  main.doc-main {
    padding: 28px 20px 64px;
  }

  h1 {
    font-size: 26px;
  }

  h2 {
    font-size: 20px;
    margin: 34px 0 10px;
  }

  h3 {
    font-size: 16px;
  }

  p,
  ul.doc-list,
  ol.doc-list {
    font-size: 15.5px;
    max-width: none;
  }

  pre {
    padding: 14px 16px;
    font-size: 12.5px;
  }

  table.doc-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

  .next {
    flex-direction: column;
    gap: 10px;
  }

  .masthead {
    padding: 40px 24px 0;
  }

  .rule-thick {
    margin: 20px 24px 8px;
  }

  .rule-thin {
    margin: 0 24px 28px;
  }

  .home-body {
    padding: 0 24px 56px;
  }

  .part-title {
    font-size: 19px;
  }

  .entry {
    font-size: 14.5px;
  }
}