/* After the manner of a mid-century English horological treatise:
   cream laid paper, Garamond text, small capitals, hairline rules, lettered figures. */
:root {
  --cloth: #1c2029;
  --cloth-2: #262b36;
  --paper: #f3eee1;
  --paper-2: #ebe4d2;
  --ink: #1d1a15;
  --ink-soft: #4a443a;
  --ink-faint: #8b8372;
  --rule: #b9b09c;
  --rubric: #8c2a1c;
  --gilt: #a8833a;
  --shadow: rgba(30, 22, 10, .22);
  --serif: "EB Garamond", "Garamond", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --cloth: #111318; --cloth-2: #181b22; }
}
:root[data-theme="dark"] { --cloth: #111318; --cloth-2: #181b22; }

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background:
    radial-gradient(ellipse at 50% 0%, rgba(255,255,255,.05), transparent 60%),
    repeating-linear-gradient(45deg, rgba(255,255,255,.012) 0 2px, transparent 2px 4px),
    var(--cloth);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
button { font-family: inherit; }

/* ── The spread ─────────────────────────────────── */
.spread {
  display: grid;
  grid-template-columns: minmax(340px, 30rem) minmax(0, 1fr);
  max-width: 1680px;
  height: 100vh;
  margin: 0 auto;
  padding: 18px;
  gap: 0;
}
.page {
  position: relative;
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .35 0 0 0 0 .3 0 0 0 0 .2 0 0 0 .06 0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E"),
    var(--paper);
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding: 22px 34px 14px;
}
.page-left {
  border-radius: 3px 0 0 3px;
  box-shadow: inset -26px 0 30px -22px var(--shadow), -2px 3px 14px rgba(0,0,0,.45);
  overflow-y: auto; scrollbar-width: thin; scrollbar-color: var(--rule) transparent;
}
.page-right {
  border-radius: 0 3px 3px 0;
  box-shadow: inset 26px 0 30px -22px var(--shadow), 2px 3px 14px rgba(0,0,0,.45);
  padding-left: 30px;
}

.running-head {
  display: flex; justify-content: space-between;
  font-variant: small-caps; font-feature-settings: "smcp", "c2sc";
  letter-spacing: .14em; font-size: 13px; color: var(--ink-soft);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 6px;
  flex: none;
}
.page-left .running-head .rh-right { font-style: italic; font-variant: normal; font-feature-settings: normal; letter-spacing: 0; }
.page-right .running-head span:first-child { font-style: italic; font-variant: normal; font-feature-settings: normal; letter-spacing: 0; }

.folio {
  display: flex; justify-content: space-between; align-items: baseline;
  flex: none; margin-top: auto; padding-top: 8px;
  font-size: 13px; color: var(--ink-faint);
  font-variant-numeric: oldstyle-nums;
}
.folio-no { letter-spacing: .1em; }

/* ── Chapter opening ────────────────────────────── */
.chapter { text-align: center; padding: 18px 0 10px; flex: none; }
.chapter-no {
  font-feature-settings: "smcp", "c2sc"; font-variant: small-caps;
  letter-spacing: .3em; font-size: 13px; color: var(--rubric);
}
.chapter h1 {
  font-weight: 400; font-size: 31px; line-height: 1.1;
  margin: 6px 0 4px; letter-spacing: .01em;
}
.chapter-sub { margin: 0; font-style: italic; font-size: 14.5px; color: var(--ink-soft); }
.chapter::after {
  content: "❧"; display: block; margin-top: 6px; color: var(--ink-faint); font-size: 15px;
}

/* ── Lesson text ────────────────────────────────── */
.lesson { flex: none; }
.stage-head {
  font-weight: 500; font-size: 18px; margin: 8px 0 0;
  font-feature-settings: "smcp", "c2sc"; font-variant: small-caps; letter-spacing: .08em;
}
.stage-sub { margin: 0 0 6px; font-style: italic; font-size: 14px; color: var(--ink-faint); }
.prose { margin: 0 0 6px; text-align: justify; hyphens: auto; font-size: 16px; }
.dropcap::first-letter {
  float: left; font-size: 3.05em; line-height: .82; padding: 4px 6px 0 0; color: var(--rubric);
}
.step {
  margin-top: 8px; padding: 8px 0 4px;
  border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
}
.step-label {
  font-feature-settings: "smcp", "c2sc"; font-variant: small-caps; letter-spacing: .14em;
  font-size: 12.5px; color: var(--ink-faint);
}
.step-name { margin: 2px 0 4px; font-size: 19px; font-style: italic; }
.pos {
  display: inline-block; min-width: 2.1em; font-style: normal; font-size: 14px;
  border: 1px solid var(--ink); border-radius: 50%; text-align: center; padding: 0 .35em;
  margin-right: 4px; font-variant-numeric: lining-nums;
}
.specs { display: grid; grid-template-columns: auto 1fr; gap: 0 12px; margin: 4px 0 2px; font-size: 14.5px; }
.specs dt { font-feature-settings: "smcp", "c2sc"; font-variant: small-caps; letter-spacing: .08em; color: var(--ink-soft); }
.specs dd { margin: 0; font-style: italic; }
.notice {
  min-height: 1.4em; margin: 6px 0 0; font-style: italic; font-size: 15px; color: var(--rubric);
}
.notice.good { color: var(--ink-soft); }

/* ── List of components ─────────────────────────── */
.parts-head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-top: 10px; padding-bottom: 3px; border-bottom: 1px solid var(--ink);
  font-feature-settings: "smcp", "c2sc"; font-variant: small-caps; letter-spacing: .12em; font-size: 14px;
  flex: none;
}
.tally { font-style: italic; letter-spacing: 0; font-feature-settings: normal; font-variant: normal; color: var(--ink-soft); }
.parts {
  list-style: none; margin: 0; padding: 2px 4px 0 0;
  overflow-y: auto; flex: 1 1 auto; min-height: 170px;
  scrollbar-width: thin; scrollbar-color: var(--rule) transparent;
}
.parts li { margin: 0; }
.parts .stage-row {
  font-feature-settings: "smcp", "c2sc"; font-variant: small-caps; letter-spacing: .1em;
  font-size: 12.5px; color: var(--ink-faint); padding: 6px 0 1px;
}
.part-btn {
  display: grid; grid-template-columns: 2.6em 1fr auto; align-items: baseline;
  width: 100%; border: 0; background: none; padding: 2px 4px; margin: 0;
  font-size: 15.5px; color: var(--ink); text-align: left; cursor: pointer;
  border-radius: 2px;
}
.part-btn .p-no { font-variant-numeric: oldstyle-nums; color: var(--ink-soft); }
.part-btn .p-name { overflow: hidden; white-space: nowrap; text-overflow: clip; }
.part-btn .p-name::after {
  content: " . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .";
  color: var(--rule); letter-spacing: .05em;
}
.part-btn .p-mark { padding-left: 6px; min-width: 1.2em; text-align: right; font-style: italic; }
.part-btn:hover { background: var(--paper-2); }
.part-btn:focus-visible { outline: 1px dashed var(--ink); outline-offset: 1px; }
.part-btn.fitted { color: var(--ink-faint); }
.part-btn.fitted .p-name { text-decoration: line-through; text-decoration-color: var(--rule); }
.part-btn.fitted .p-mark::before { content: "✓"; color: var(--ink-soft); font-style: normal; }
.part-btn.next .p-mark::before { content: "☜"; color: var(--rubric); font-style: normal; }
.part-btn.held { background: var(--ink); color: var(--paper); }
.part-btn.held .p-no { color: var(--paper-2); }
.part-btn.held .p-name::after { color: #6b6455; }
.part-btn.held .p-mark::before { content: "in hand"; color: var(--paper); font-size: 13px; }
.part-btn.shake { animation: shake .35s; }
@keyframes shake { 20%,60% { transform: translateX(-3px) } 40%,80% { transform: translateX(3px) } }

/* ── The figure ─────────────────────────────────── */
.figure {
  position: relative; flex: 1 1 auto; min-height: 260px; margin-top: 10px;
  border: 1px solid var(--rule);
  outline: 1px solid var(--rule); outline-offset: 3px;
  background: #f7f3ea;
  overflow: hidden;
}
#gl { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; cursor: grab; }
#gl.holding { cursor: crosshair; }
.callouts { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.callouts line { stroke: var(--ink); stroke-width: .8; }
.callouts circle.dot { fill: var(--ink); }
.callouts text {
  font-family: var(--serif); font-style: italic; font-size: 17px; fill: var(--ink);
  paint-order: stroke; stroke: #f7f3ea; stroke-width: 4px; stroke-linejoin: round;
}
.hover-label {
  position: absolute; pointer-events: none; transform: translate(14px, -50%);
  font-style: italic; font-size: 15px; white-space: nowrap;
  background: rgba(247, 243, 234, .92); border-bottom: 1px solid var(--ink);
  padding: 0 5px; opacity: 0; transition: opacity .12s;
}
.hover-label.on { opacity: 1; }
.loading {
  position: absolute; inset: 0; display: grid; place-items: center; background: #f7f3ea;
  transition: opacity .6s; z-index: 3;
}
.loading.done { opacity: 0; pointer-events: none; }
.loading-inner { text-align: center; color: var(--ink-soft); }
.loading-bar { width: 180px; height: 2px; background: var(--rule); margin: 10px auto 0; }
.loading-bar span { display: block; height: 100%; width: 0; background: var(--ink); transition: width .2s; }

.view-tools {
  position: absolute; top: 8px; right: 8px; display: flex; gap: 4px; flex-wrap: wrap; justify-content: flex-end;
  z-index: 2;
}
.view-tools button, .speeds button {
  border: 1px solid var(--rule); background: rgba(247, 243, 234, .9); color: var(--ink-soft);
  font-size: 13px; padding: 1px 8px; cursor: pointer; letter-spacing: .06em;
  font-feature-settings: "smcp", "c2sc"; font-variant: small-caps;
}
.view-tools button:hover, .speeds button:hover { color: var(--ink); border-color: var(--ink); }
.view-tools button[aria-pressed="true"], .speeds button[aria-checked="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }

.rate-card {
  position: absolute; left: 10px; bottom: 10px; z-index: 2;
  display: flex; flex-direction: column; gap: 6px; align-items: center; width: 178px;
  background: rgba(247, 243, 234, .94); border: 1px solid var(--ink); outline: 1px solid var(--ink); outline-offset: -4px;
  padding: 10px 12px 8px;
}
.rate-card[hidden] { display: none; }
.rate th { font-size: 12.5px; }
.mini-dial { width: 104px; height: 104px; }
.rate { border-collapse: collapse; font-size: 13.5px; width: 100%; }
.rate th {
  text-align: left; font-weight: 400; padding: 0 10px 0 0; color: var(--ink-soft);
  font-feature-settings: "smcp", "c2sc"; font-variant: small-caps; letter-spacing: .08em;
}
.rate td { font-style: italic; font-variant-numeric: tabular-nums lining-nums; }
.reserve { display: inline-block; width: 46px; height: 7px; border: 1px solid var(--ink); vertical-align: middle; position: relative; }
.reserve span { position: absolute; inset: 0 auto 0 0; background: repeating-linear-gradient(90deg, var(--ink) 0 2px, transparent 2px 3px); }
.speeds { display: flex; gap: 3px; }

.caption {
  flex: none; margin: 10px 0 0; font-size: 15px; text-align: justify; hyphens: auto;
  min-height: 2.9em;
}
.fig-no { font-feature-settings: "smcp", "c2sc"; font-variant: small-caps; letter-spacing: .08em; }
.caption em { font-style: italic; }

.controls {
  flex: none; display: flex; flex-wrap: wrap; gap: 6px; justify-content: center;
  margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--rule);
}
.controls button, .colophon button {
  border: 1px solid var(--ink); background: transparent; color: var(--ink);
  font-size: 15px; padding: 3px 14px 4px; cursor: pointer; letter-spacing: .1em;
  font-feature-settings: "smcp", "c2sc"; font-variant: small-caps;
  transition: background .12s, color .12s;
}
.controls button.primary { box-shadow: inset 0 0 0 2px var(--paper), inset 0 0 0 3px var(--ink); padding: 5px 16px 6px; }
.controls button:hover:not(:disabled), .colophon button:hover { background: var(--ink); color: var(--paper); }
.controls button[aria-pressed="false"] { color: var(--ink-faint); border-color: var(--rule); }
.controls button:disabled { opacity: .35; cursor: default; }
.controls button.active { background: var(--rubric); border-color: var(--rubric); color: var(--paper); }
button:focus-visible { outline: 1px dashed var(--ink); outline-offset: 2px; }

/* ── Colophon (completion) ─────────────────────── */
.colophon {
  position: fixed; inset: 0; display: grid; place-items: center;
  background: rgba(15, 17, 22, .55); z-index: 10; padding: 16px;
}
.colophon[hidden] { display: none; }
.colophon-inner {
  background: var(--paper); max-width: 440px; width: 100%; text-align: center; padding: 26px 34px 24px;
  border: 1px solid var(--ink); outline: 1px solid var(--ink); outline-offset: -7px;
  box-shadow: 0 20px 60px rgba(0,0,0,.5);
}
.colophon-orn { font-size: 26px; margin: 0; color: var(--rubric); }
.colophon h3 {
  font-weight: 400; font-size: 22px; margin: 4px 0 8px;
  font-feature-settings: "smcp", "c2sc"; font-variant: small-caps; letter-spacing: .1em;
}
.colophon p { font-style: italic; margin: 0 0 16px; }
.colophon .quiet { border-color: transparent; color: var(--ink-soft); margin-left: 4px; }
.intro-inner { max-width: 540px; max-height: calc(100vh - 32px); overflow-y: auto; padding: 28px 38px 26px; }
.intro-inner .chapter-no { margin-bottom: 2px; }
.intro-inner .intro-body { text-align: left; font-style: normal; }
.intro-inner p.intro-body { margin: 0 0 10px; text-align: justify; hyphens: auto; }
.intro-list { text-align: left; margin: 4px 0 18px; padding: 0; list-style: none; font-size: 15.5px; }
.intro-list li { padding: 3px 0 3px 1.6em; text-indent: -1.6em; border-bottom: 1px solid var(--paper-2); }
.intro-list li::before { content: "☞"; display: inline-block; width: 1.6em; text-indent: 0; color: var(--rubric); }
.intro-list b { font-weight: 500; font-feature-settings: "smcp", "c2sc"; font-variant: small-caps; letter-spacing: .06em; }
@media (max-width: 600px) { .intro-inner { padding: 22px 20px 20px; } }

/* ── Narrow screens: one page above the other ── */
@media (max-width: 900px) {
  .spread { grid-template-columns: 1fr; height: auto; padding: 10px; }
  .page { padding: 16px 16px 10px; }
  .page-left { border-radius: 3px 3px 0 0; box-shadow: inset 0 -20px 26px -22px var(--shadow); order: 2; }
  .page-right { border-radius: 3px 3px 0 0; box-shadow: none; padding-left: 16px; order: 1; }
  .figure { min-height: 0; height: 62vh; }
  .parts { max-height: 46vh; }
  .chapter { padding-top: 8px; }
  .chapter h1 { font-size: 26px; }
  .rate-card { flex-direction: row; width: auto; padding: 6px 8px; flex-wrap: wrap; justify-content: center; }
  .mini-dial { width: 64px; height: 64px; }
  .rate { font-size: 12.5px; }
  .controls button { font-size: 14px; padding: 3px 10px; }
}
@media (max-height: 980px) and (min-width: 901px) {
  .chapter { padding: 6px 0 4px; }
  .chapter h1 { font-size: 26px; }
  .chapter-sub { display: none; }
  .prose { font-size: 15px; }
}

/* ── Credits ───────────────────────────────────── */
.credits {
  margin: 18px 0 0 !important; padding-top: 10px; border-top: 1px solid var(--rule);
  font-size: 12.5px; line-height: 1.4; color: var(--ink-faint); text-align: left;
}
.credits em { font-style: italic; }
.credits a, .folio-link { color: var(--ink-soft); text-decoration-color: var(--rule); text-underline-offset: 2px; }
.credits a:hover, .folio-link:hover { color: var(--rubric); }
.colophon .credits { font-style: normal; }