/* Diagrammatic — a page from an old grammar */

@font-face { font-family: 'IM Fell English'; src: url(../fonts/fell-english.woff2) format('woff2'); font-style: normal; font-weight: 400; font-display: swap; }
@font-face { font-family: 'IM Fell English'; src: url(../fonts/fell-english-italic.woff2) format('woff2'); font-style: italic; font-weight: 400; font-display: swap; }
@font-face { font-family: 'IM Fell English SC'; src: url(../fonts/fell-english-sc.woff2) format('woff2'); font-display: swap; }
@font-face { font-family: 'IM Fell Double Pica'; src: url(../fonts/fell-doublepica.woff2) format('woff2'); font-style: normal; font-display: swap; }
@font-face { font-family: 'IM Fell Double Pica'; src: url(../fonts/fell-doublepica-italic.woff2) format('woff2'); font-style: italic; font-display: swap; }
@font-face { font-family: 'IM Fell Great Primer SC'; src: url(../fonts/fell-greatprimer-sc.woff2) format('woff2'); font-display: swap; }

:root {
  --paper: #f2e8cf;
  --paper-deep: #e9dcbb;
  --plate: #f6eedb;
  --ink: #2a1e13;
  --ink-soft: #5c4a36;
  --ink-faint: #8c7a62;
  --rubric: #8a2a1b;
  --rule: #2a1e13;
  --sel: rgba(138, 42, 27, 0.18);
  --frame-outer: var(--ink);
  --stroke: 1.3px;
  --grain-opacity: 0.55;
  --body: 'IM Fell English', 'Iowan Old Style', 'Palatino Linotype', Palatino, Georgia, serif;
  --sc: 'IM Fell English SC', 'IM Fell English', Georgia, serif;
  --display: 'IM Fell Great Primer SC', 'IM Fell English SC', Georgia, serif;
  --dp: 'IM Fell Double Pica', 'IM Fell English', Georgia, serif;
  color-scheme: light;
}

:root[data-theme="slate"] {
  --paper: #23292a;
  --paper-deep: #1b2021;
  --plate: #2a3132;
  --ink: #ece6d6;
  --ink-soft: #c3bba8;
  --ink-faint: #8f8a7d;
  --rubric: #e7a977;
  --rule: #d9d2c0;
  --sel: rgba(231, 169, 119, 0.22);
  --frame-outer: #6e4b2a;
  --stroke: 1.5px;
  --grain-opacity: 0.35;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  background-image:
    radial-gradient(ellipse at 50% 0%, rgba(255, 250, 235, 0.55), transparent 60%),
    radial-gradient(ellipse at 50% 120%, rgba(120, 85, 40, 0.16), transparent 60%);
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--body);
  font-size: 19px;
  line-height: 1.52;
  font-feature-settings: "liga", "dlig";
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}
:root[data-theme="slate"] body {
  background-image:
    radial-gradient(ellipse at 30% 10%, rgba(255, 255, 255, 0.05), transparent 55%),
    radial-gradient(ellipse at 80% 90%, rgba(255, 255, 255, 0.035), transparent 50%);
}
::selection { background: var(--sel); }

.grain {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  opacity: var(--grain-opacity);
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .35  0 0 0 0 .25  0 0 0 0 .12  0 0 0 .16 0'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)'/%3E%3C/svg%3E"),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='700' height='700'%3E%3Cfilter id='f'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.012' numOctaves='2' seed='7'/%3E%3CfeColorMatrix values='0 0 0 0 .55  0 0 0 0 .38  0 0 0 0 .15  0 0 0 .11 0'/%3E%3C/filter%3E%3Crect width='700' height='700' filter='url(%23f)'/%3E%3C/svg%3E");
}
:root[data-theme="slate"] .grain { mix-blend-mode: screen; filter: invert(1) grayscale(1); opacity: 0.22; }

.leaf {
  position: relative; z-index: 1;
  max-width: 1040px;
  margin: 0 auto;
  padding: 26px 56px 70px;
}

a { color: var(--rubric); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--ink); }

.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* running head, like the top of a printed page */
.running-head {
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--sc); font-size: 14px; letter-spacing: 0.06em;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 4px;
}
.rh-l, .rh-r { min-width: 7em; }
.rh-r { text-align: right; font-family: var(--body); font-style: italic; }

.theme-switch {
  position: absolute; top: 58px; right: 56px;
  font-family: var(--sc); font-size: 14px; letter-spacing: .05em; color: var(--ink-faint);
}
.theme-switch button {
  background: none; border: 0; padding: 2px 3px; margin: 0; cursor: pointer;
  font: inherit; color: var(--ink-faint); letter-spacing: inherit;
}
.theme-switch button[aria-pressed="true"] { color: var(--ink); text-decoration: underline; text-underline-offset: 4px; text-decoration-thickness: 1px; }
.theme-switch button:hover { color: var(--rubric); }
.theme-switch button:focus-visible { outline: 1px dotted var(--rubric); outline-offset: 2px; }

/* title page */
.title-page { text-align: center; padding: 54px 0 18px; }
.kicker {
  font-family: var(--dp); font-style: italic; font-size: 20px; margin: 0 0 6px; color: var(--ink-soft);
}
h1 {
  margin: 0;
  font-family: var(--display);
  font-weight: normal;
  font-size: clamp(46px, 9.6vw, 104px);
  line-height: 0.95;
  letter-spacing: 0.07em;
  color: var(--ink);
}
h1 .t1 { display: inline-block; padding-left: 0.07em; }
.subtitle {
  font-family: var(--dp); font-style: italic;
  font-size: clamp(19px, 2.6vw, 26px); line-height: 1.25;
  margin: 14px 0 22px;
}
.double-rule {
  height: 6px; border-top: 2.5px solid var(--rule); border-bottom: 1px solid var(--rule);
  max-width: 520px; margin: 0 auto;
}
.after {
  font-family: var(--sc); font-size: 17px; letter-spacing: 0.09em; margin: 12px 0 8px; color: var(--ink-soft);
}
.fleuron { width: 120px; height: 24px; display: block; margin: 6px auto 0; }
.fleuron path { fill: none; stroke: var(--rubric); stroke-width: 1.2; stroke-linecap: round; }
.fleuron .fill { fill: var(--rubric); stroke: none; }

/* lessons */
h2 {
  font-family: var(--sc); font-weight: normal; font-size: 25px; letter-spacing: 0.04em;
  text-align: center; margin: 46px 0 6px;
}
.rubric { color: var(--rubric); }
.sc { font-family: var(--sc); letter-spacing: .04em; }
.direction {
  max-width: 640px; margin: 0 auto 18px; text-align: center; color: var(--ink-soft); font-size: 18px;
  text-wrap: pretty;
}
.manicule { font-family: 'Apple Symbols', 'Segoe UI Symbol', 'DejaVu Sans', serif; color: var(--rubric); font-style: normal; margin-right: 2px; }

#form { max-width: 760px; margin: 0 auto; }
textarea {
  display: block; width: 100%;
  font-family: var(--body); font-style: italic; font-size: 24px; line-height: 38px;
  color: var(--ink);
  background-color: transparent;
  background-image: linear-gradient(to bottom, transparent 36px, var(--ink-faint) 36px, var(--ink-faint) 37px, transparent 37px);
  background-size: 100% 38px;
  background-attachment: local;
  border: 0; border-top: 1px solid var(--rule); border-bottom: 2px solid var(--rule);
  padding: 4px 6px 6px;
  resize: vertical; min-height: 92px;
  caret-color: var(--rubric);
}
textarea::placeholder { color: var(--ink-faint); }
textarea:focus { outline: none; background-color: color-mix(in srgb, var(--plate) 60%, transparent); }
.actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 18px; }
.btn {
  font-family: var(--sc); font-size: 17px; letter-spacing: 0.06em;
  color: var(--ink); background: transparent;
  border: 1px solid var(--ink); outline: 1px solid var(--ink); outline-offset: 2px;
  padding: 6px 18px 7px; cursor: pointer; border-radius: 0;
  transition: background .15s, color .15s;
}
.btn:hover, .btn:focus-visible { background: var(--ink); color: var(--paper); }
.btn.primary { color: var(--paper); background: var(--ink); }
.btn.primary:hover, .btn.primary:focus-visible { background: var(--rubric); border-color: var(--rubric); outline-color: var(--rubric); }

/* plates */
#plates { margin-top: 34px; }
.plate { margin: 0 0 54px; }
.plate-num {
  text-align: center; font-family: var(--sc); letter-spacing: .1em; font-size: 15px; color: var(--ink-soft); margin-bottom: 8px;
}
.plate-frame {
  position: relative;
  border: 1px solid var(--frame-outer);
  outline: 3px double var(--frame-outer); outline-offset: 4px;
  background: var(--plate);
  margin: 0 6px;
  padding: 10px 6px;
  overflow-x: auto; overflow-y: hidden;
  scrollbar-width: thin; scrollbar-color: var(--ink-faint) transparent;
}
:root[data-theme="slate"] .plate-frame {
  border: 0;
  outline: 0;
  box-shadow: 0 0 0 9px #6b4527, 0 0 0 10px #3d2615, inset 0 0 40px rgba(0,0,0,.35), 0 6px 22px rgba(0,0,0,.45);
  margin: 10px 16px;
}
.plate-inner { display: flex; justify-content: center; min-width: min-content; }
.plate-inner svg { display: block; flex: none; height: auto; }

figcaption {
  text-align: center; margin: 16px auto 0; max-width: 760px; font-size: 18px; text-wrap: balance;
}
figcaption .fig { font-family: var(--sc); letter-spacing: .05em; }

.tools {
  display: flex; justify-content: center; gap: 4px 16px; flex-wrap: wrap;
  margin: 8px 0 0; font-family: var(--sc); font-size: 14px; letter-spacing: .05em;
}
.tools button {
  background: none; border: 0; padding: 2px 0; color: var(--ink-faint); cursor: pointer; font: inherit; letter-spacing: inherit;
  border-bottom: 1px dotted transparent;
}
.tools button:hover, .tools button:focus-visible { color: var(--rubric); border-bottom-color: var(--rubric); outline: none; }

.analysis {
  max-width: 720px; margin: 22px auto 0; text-align: justify; hyphens: auto; -webkit-hyphens: auto;
}
.analysis p { margin: 0; text-indent: 0; }
.analysis p::first-line { }
.analysis .head { font-family: var(--sc); letter-spacing: .05em; color: var(--rubric); }
.clause-no { font-family: var(--sc); letter-spacing: .03em; }
.unplaced { color: var(--ink-soft); }

details.parsing { max-width: 720px; margin: 16px auto 0; }
details.parsing summary {
  cursor: pointer; font-family: var(--sc); letter-spacing: .05em; font-size: 16px; color: var(--ink-soft);
  list-style: none; text-align: center;
}
details.parsing summary::-webkit-details-marker { display: none; }
details.parsing summary::before { content: '☞ '; font-family: 'Apple Symbols', 'Segoe UI Symbol', serif; color: var(--rubric); }
details.parsing[open] summary::before { content: '☜ '; }
details.parsing summary:hover { color: var(--rubric); }
.parse-grid {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 10px 8px; margin: 14px 0 4px;
}
.pword { display: flex; flex-direction: column; align-items: center; min-width: 64px; }
.pword .wtxt { font-style: italic; font-size: 19px; line-height: 1.2; }
.pword select {
  margin-top: 2px; font-family: var(--sc); font-size: 13px; letter-spacing: .03em;
  color: var(--ink-soft); background: transparent; border: 0; border-top: 1px solid var(--ink-faint);
  padding: 2px 2px 0; cursor: pointer; text-align: center; text-align-last: center; max-width: 140px;
  appearance: none; -webkit-appearance: none;
}
.pword select:focus-visible { outline: 1px dotted var(--rubric); }
.pword.changed .wtxt { color: var(--rubric); }
.pword.changed select { color: var(--rubric); border-top-color: var(--rubric); }
.parse-note { text-align: center; font-size: 15px; color: var(--ink-faint); margin: 6px 0 0; font-style: italic; }
.reset-parse { background: none; border: 0; font: inherit; color: var(--rubric); cursor: pointer; text-decoration: underline; padding: 0; }

.empty-plate { text-align: center; color: var(--ink-faint); font-style: italic; padding: 30px 0; }

/* exercises */
.exercise-list { columns: 2 340px; column-gap: 46px; max-width: 900px; margin: 0 auto; }
.ex-group { break-inside: avoid; margin: 0 0 18px; }
.ex-group h3 { font-family: var(--sc); font-weight: normal; letter-spacing: .05em; font-size: 17px; margin: 0 0 4px; color: var(--rubric); }
.ex-group ol { margin: 0; padding-left: 2.1em; }
.ex-group li { margin: 2px 0; padding-left: 4px; }
.ex-group li::marker { font-family: var(--body); color: var(--ink-faint); font-size: 16px; }
.ex-group button {
  background: none; border: 0; padding: 0; margin: 0; font: inherit; font-style: italic; color: var(--ink); text-align: left; cursor: pointer;
  line-height: 1.38;
}
.ex-group button:hover, .ex-group button:focus-visible { color: var(--rubric); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; outline: none; }
.ex-group .src { font-size: 14px; color: var(--ink-faint); font-variant: small-caps; letter-spacing: .03em; white-space: nowrap; }

/* key */
.key-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 26px 30px;
  max-width: 980px; margin: 0 auto;
}
.key-cell { text-align: center; }
.key-cell .kframe { border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); padding: 8px 0; display: flex; justify-content: center; height: 196px; align-items: center; overflow: hidden; }
.key-cell svg { max-width: 100%; height: auto; }
.key-cell h4 { font-family: var(--sc); font-weight: normal; letter-spacing: .05em; font-size: 16px; margin: 8px 0 0; }
.key-cell p { margin: 2px 0 0; font-size: 16px; color: var(--ink-soft); line-height: 1.38; text-wrap: pretty; }

/* colophon */
.colophon { margin-top: 64px; font-size: 17px; text-align: center; color: var(--ink-soft); }
.colophon p { max-width: 680px; margin: 14px auto 0; text-wrap: pretty; }
.colophon .imprint { font-family: var(--sc); letter-spacing: .08em; font-size: 14px; margin-top: 20px; }
.noscript { text-align: center; }

/* the diagrams themselves */
svg.rk line, svg.rk path { stroke: var(--ink); stroke-width: var(--stroke); fill: none; stroke-linecap: round; stroke-linejoin: round; }
svg.rk .dash { stroke-dasharray: 4.5 4; stroke-linecap: butt; }
svg.rk text { font-family: 'IM Fell English', Georgia, serif; font-style: italic; fill: var(--ink); }
svg.rk text.lbl { fill: var(--ink-soft); }
svg.rk text.und { fill: var(--ink-soft); }
svg.rk rect.knock { fill: var(--plate); }
svg.rk .loose { opacity: .5; }
:root[data-theme="slate"] svg.rk text { filter: url(#chalk); }
:root[data-theme="slate"] svg.rk .rk-lines { filter: url(#chalk-line); }

.toast {
  position: fixed; left: 50%; bottom: 26px; transform: translateX(-50%) translateY(20px);
  background: var(--ink); color: var(--paper); font-family: var(--sc); letter-spacing: .05em; font-size: 15px;
  padding: 7px 16px; opacity: 0; transition: opacity .2s, transform .2s; pointer-events: none; z-index: 10;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 720px) {
  body { font-size: 18px; }
  .leaf { padding: 16px 16px 50px; }
  .running-head { font-size: 12px; }
  .rh-c { display: none; }
  .theme-switch { position: static; text-align: right; margin-top: 8px; }
  .title-page { padding-top: 26px; }
  h2 { font-size: 22px; margin-top: 38px; }
  textarea { font-size: 21px; }
  .plate-frame { margin: 0 4px; padding: 6px 2px; }
  :root[data-theme="slate"] .plate-frame { margin: 10px 10px; }
  .analysis { text-align: left; }
}

@media print {
  .grain, .theme-switch, .lesson, .exercises, .tools, details.parsing, .key { display: none !important; }
  body { background: #fff; }
  .leaf { padding: 0; }
  .plate { break-inside: avoid; }
  .plate-frame { overflow: visible; }
}

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }