/* Bunyan: a drawing set. Vellum and ink by day, a blueprint by night. */

@font-face {
  font-family: "Archivo";
  src: url("fonts/archivo-latin.woff2") format("woff2");
  font-weight: 100 900;
  font-stretch: 62% 125%;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329,
    U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Noto Kufi Arabic";
  src: url("fonts/noto-kufi-arabic.woff2") format("woff2");
  font-weight: 100 900;
  font-display: swap;
  unicode-range: U+0600-06FF, U+0750-077F, U+0870-088E, U+0890-0891, U+0897-08E1, U+08E3-08FF, U+200C-200E,
    U+2010-2011, U+204F, U+2E41, U+FB50-FDFF, U+FE70-FE74, U+FE76-FEFC;
}

:root {
  --paper: #e9ede8;
  --sheet: #f6f7f3;
  --ink: #1d2a33;
  --graphite: #56626b;
  --rule: #c3cccb;
  --blue: #245e7a;
  --wash: #d5e4ea;
  --red: #b8321b;
  --grid: rgb(29 42 51 / 4%);
  --grid-major: rgb(29 42 51 / 7%);
  --font: "Archivo", "Noto Kufi Arabic", system-ui, sans-serif;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0c243a;
    --sheet: #102d48;
    --ink: #e6eff5;
    --graphite: #a8c0d3;
    --rule: #2e5373;
    --blue: #9ccbe6;
    --wash: #1b4466;
    --red: #ff8e73;
    --grid: rgb(191 217 234 / 4%);
    --grid-major: rgb(191 217 234 / 7%);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --paper: #0c243a;
  --sheet: #102d48;
  --ink: #e6eff5;
  --graphite: #a8c0d3;
  --rule: #2e5373;
  --blue: #9ccbe6;
  --wash: #1b4466;
  --red: #ff8e73;
  --grid: rgb(191 217 234 / 4%);
  --grid-major: rgb(191 217 234 / 7%);
  color-scheme: dark;
}

html[lang="ar"] {
  --font: "Noto Kufi Arabic", "Archivo", system-ui, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid-major) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-major) 1px, transparent 1px),
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px, 24px 24px, 24px 24px;
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--font);
  font-kerning: normal;
}

html[lang="ar"] body {
  font-size: 1rem;
  line-height: 1.95;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  line-height: 1.2;
  font-weight: 650;
  font-stretch: 87%;
  text-wrap: balance;
}

html[lang="ar"] :is(h1, h2, h3, h4) {
  font-weight: 700;
  line-height: 1.55;
}

h1 {
  font-size: clamp(1.8rem, 1.2rem + 2.2vw, 2.6rem);
}

h2 {
  font-size: clamp(1.3rem, 1.1rem + 0.7vw, 1.6rem);
}

h3 {
  font-size: 1.125rem;
}

h4 {
  font-size: 0.95rem;
}

p {
  margin: 0;
}

a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

button {
  font: inherit;
}

abbr[title] {
  text-decoration: none;
  cursor: help;
}

[hidden] {
  display: none !important;
}

.visually-hidden,
.offscreen {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip {
  position: absolute;
  inset-inline-start: 1rem;
  top: -4rem;
  z-index: 10;
  padding: 0.5rem 0.8rem;
  background: var(--ink);
  color: var(--sheet);
}

.skip:focus {
  top: 0.75rem;
}

/* Page frame */

.masthead,
main,
.colophon {
  width: min(100% - 2rem, 84rem);
  margin-inline: auto;
}

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1.75rem;
  padding-block: 1rem 0.85rem;
  border-bottom: 2px solid var(--ink);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
  color: var(--ink);
  text-decoration: none;
}

.brand-en {
  font-family: "Archivo", sans-serif;
  font-size: 1.55rem;
  font-weight: 700;
  font-stretch: 78%;
  line-height: 1;
}

.brand-ar {
  font-family: "Noto Kufi Arabic", sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1;
}

/* Each language leads with its own name. */
html[lang="ar"] .brand-ar,
html[lang="ar"] .tb-mark [lang="ar"] {
  order: -1;
}

.nav {
  display: flex;
  flex: 1;
  flex-wrap: wrap;
  gap: 0.2rem 1.25rem;
}

.nav a {
  padding-block: 0.3rem;
  border-bottom: 2px solid transparent;
  color: var(--ink);
  font-weight: 550;
  text-decoration: none;
}

.nav a:hover {
  border-bottom-color: var(--rule);
}

.nav a[aria-current="page"] {
  border-bottom-color: var(--ink);
}

.tools {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.lang {
  padding: 0.25rem 0.65rem;
  border: 1px solid var(--ink);
  border-radius: 2px;
  color: var(--ink);
  font-family: "Noto Kufi Arabic", "Archivo", sans-serif;
  font-weight: 600;
  text-decoration: none;
}

.lang:hover {
  background: var(--wash);
}

.theme {
  display: grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  padding: 0;
  border: 1px solid var(--ink);
  border-radius: 50%;
  background: none;
  color: var(--ink);
  cursor: pointer;
}

.theme:hover {
  background: var(--wash);
}

.theme-icon {
  width: 1.1rem;
  height: 1.1rem;
}

.ti-ring {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
}

.ti-half {
  fill: currentColor;
}

@media (max-width: 40rem) {
  .nav {
    order: 3;
    flex-basis: 100%;
  }

  .tools {
    margin-inline-start: auto;
  }
}

main {
  padding-block: 2rem 4rem;
}

main:focus {
  outline: none;
}

.loading {
  color: var(--graphite);
}

.notice {
  margin-top: 1rem;
  padding: 0.6rem 0.9rem;
  border-inline-start: 3px solid var(--red);
  background: var(--sheet);
}

.colophon {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 2rem;
  padding-block: 1.25rem 2.5rem;
  border-top: 2px solid var(--ink);
  color: var(--graphite);
  font-size: 0.9rem;
}

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

.version {
  margin-inline-start: 0.75rem;
}

/* The design advisor */

.intro {
  max-width: 46rem;
  margin-bottom: 1.5rem;
}

.intro > p {
  margin-top: 0.6rem;
  color: var(--graphite);
}

.sheet {
  padding: 14px;
  border: 2px solid var(--ink);
  background: var(--sheet);
  box-shadow: inset 0 0 0 5px var(--sheet), inset 0 0 0 6px var(--ink);
}

.sheet-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  padding: 0.35rem 0.5rem 0.85rem;
  border-bottom: 1px solid var(--ink);
}

.sheet-head h2 {
  font-size: 1.15rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.actions button {
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--ink);
  border-radius: 2px;
  background: transparent;
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
}

.actions button:hover {
  background: var(--wash);
}

.actions .quiet {
  border-style: dashed;
  color: var(--graphite);
}

.toast {
  flex-basis: 100%;
  color: var(--blue);
  font-size: 0.9rem;
  font-weight: 600;
}

.toast:empty {
  display: none;
}

.plan-frame {
  overflow-x: auto;
  padding-block: 0.75rem;
}

.plan {
  display: block;
  width: 100%;
  min-width: 68rem;
  height: auto;
  font-family: var(--font);
}

@media (min-width: 64rem) {
  .plan {
    min-width: 0;
  }
}

.sheet-foot {
  display: grid;
  gap: 1.25rem;
  padding: 0.9rem 0.5rem 0.25rem;
  border-top: 1px solid var(--ink);
}

@media (min-width: 62rem) {
  .sheet-foot {
    grid-template-columns: 1fr minmax(21rem, 25rem);
  }
}

.legend h3 {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

.legend ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
  gap: 0.45rem 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.legend li {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--graphite);
  font-size: 0.88rem;
  line-height: 1.35;
}

.swatch {
  flex: none;
  width: 3rem;
  height: 1.75rem;
  overflow: visible;
}

.swatch .pl-room.w1 {
  stroke-width: 1.5;
}

.swatch .pl-room.w3,
.swatch .pl-vault {
  stroke-width: 4;
}

.lg-wall {
  stroke: var(--ink);
  stroke-width: 3;
}

/* The plan mirrors for Arabic, so the legend mirrors with it. */
html[dir="rtl"] .swatch {
  transform: scaleX(-1);
}

.titleblock {
  align-self: start;
  border: 1.5px solid var(--ink);
}

.titleblock dl {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin: 0;
}

.titleblock dl > div {
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--ink);
  border-inline-end: 1px solid var(--ink);
}

.titleblock dl > div:first-child {
  grid-column: 1 / -1;
}

.titleblock dl > div:nth-child(odd) {
  border-inline-end: none;
}

.titleblock dt {
  color: var(--graphite);
  font-size: 0.75rem;
  line-height: 1.4;
}

.titleblock dd {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.4;
  overflow-wrap: anywhere;
}

.tb-mark {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.6rem;
  font-weight: 700;
}

.tb-mark [lang="en"] {
  font-family: "Archivo", sans-serif;
  font-size: 1.1rem;
  font-stretch: 78%;
}

.tb-mark [lang="ar"] {
  font-family: "Noto Kufi Arabic", sans-serif;
}

.muted {
  color: var(--graphite);
  font-weight: 400;
}

.workspace {
  display: grid;
  gap: 2.5rem;
  margin-top: 2.75rem;
}

@media (min-width: 64rem) {
  .workspace {
    grid-template-columns: minmax(20rem, 25rem) 1fr;
    align-items: start;
    gap: 3.5rem;
  }
}

.questions > h2,
.results > h2,
.threats > h2 {
  margin-bottom: 1rem;
  font-size: 1.35rem;
}

.project {
  display: grid;
  gap: 0.3rem;
  margin-bottom: 1.75rem;
}

.project span {
  font-size: 0.95rem;
  font-weight: 600;
}

.project input {
  padding: 0.35rem 0.1rem;
  border: 0;
  border-bottom: 1.5px solid var(--ink);
  border-radius: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
}

.project input::placeholder {
  color: var(--graphite);
}

.qlist {
  display: grid;
  gap: 1.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: q;
}

.qlist > li {
  display: grid;
  grid-template-columns: 2.1rem 1fr;
  gap: 0.75rem;
  counter-increment: q;
}

/* Grid bubbles, the way architectural drawings number their grid lines. */
.qlist > li::before,
.steps > li::before {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border: 1.5px solid var(--ink);
  border-radius: 50%;
  font-size: 0.9rem;
  font-weight: 650;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.qlist > li::before {
  content: counter(q);
}

html[lang="ar"] .qlist > li::before {
  content: counter(q, arabic-indic);
}

fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

legend {
  margin-bottom: 0.2rem;
  padding: 0;
  font-size: 1.02rem;
  font-weight: 650;
  line-height: 1.4;
}

html[lang="ar"] legend {
  line-height: 1.75;
}

.help {
  margin-bottom: 0.4rem;
  color: var(--graphite);
  font-size: 0.88rem;
}

.opts {
  display: grid;
  gap: 0.25rem;
  margin-top: 0.4rem;
}

.opt {
  display: grid;
  grid-template-columns: 1.1rem 1fr;
  align-items: start;
  gap: 0.6rem;
  padding: 0.35rem 0.5rem;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 0.95rem;
  line-height: 1.4;
  cursor: pointer;
}

html[lang="ar"] .opt {
  line-height: 1.7;
}

.opt:hover {
  border-color: var(--rule);
}

.opt:has(input:checked) {
  border-color: var(--ink);
  background: var(--wash);
}

.opt input {
  width: 1rem;
  height: 1rem;
  margin: 0.2rem 0 0;
  accent-color: var(--ink);
}

html[lang="ar"] .opt input {
  margin-top: 0.4rem;
}

.group + .group {
  margin-top: 1.75rem;
}

.group h3 {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 0.4rem;
  font-size: 1.05rem;
}

.mark {
  flex: none;
  width: 0.8rem;
  height: 0.8rem;
  border: 1.5px solid var(--ink);
}

.mark-essential {
  border-color: var(--red);
  background: var(--red);
}

.mark-consider {
  border-style: dashed;
}

.count {
  color: var(--graphite);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

.plist,
.tlist {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ink);
  list-style: none;
}

.plist > li {
  border-bottom: 1px solid var(--rule);
}

summary {
  display: grid;
  grid-template-columns: 3rem 1fr auto 1rem;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.7rem 0.25rem;
  cursor: pointer;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "";
  align-self: center;
  justify-self: center;
  width: 0.45rem;
  height: 0.45rem;
  border-right: 1.5px solid var(--ink);
  border-bottom: 1.5px solid var(--ink);
  transform: rotate(45deg);
}

details[open] > summary::after {
  transform: rotate(225deg);
}

summary:hover .ptitle {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.pid {
  color: var(--graphite);
  font-weight: 650;
  font-variant-numeric: tabular-nums;
}

.ptitle {
  font-weight: 600;
}

.pdomain {
  color: var(--graphite);
  font-size: 0.85rem;
}

.pbody {
  display: grid;
  gap: 0.45rem;
  padding: 0.1rem 0.25rem 1.25rem;
  padding-inline-start: 3.75rem;
}

.pbody h4 {
  margin-top: 0.6rem;
  color: var(--graphite);
  font-size: 0.85rem;
  font-weight: 600;
}

.pbody ul:not(.controls),
.page ul:not(.controls, .items, .plain),
.page ol:not(.steps) {
  display: grid;
  gap: 0.35rem;
  margin: 0;
  padding-inline-start: 1.2rem;
}

.pbody ul:not(.controls) {
  list-style: square;
}

.pbody li::marker,
.page li::marker {
  color: var(--graphite);
}

.controls {
  display: grid;
  gap: 0.8rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.controls > li {
  padding-inline-start: 0.75rem;
  border-inline-start: 2px solid var(--rule);
}

.cname {
  font-weight: 600;
}

.level {
  margin-inline-start: 0.35rem;
  padding: 0 0.4rem;
  border: 1px solid var(--rule);
  border-radius: 2px;
  color: var(--graphite);
  font-size: 0.78rem;
  font-weight: 500;
  white-space: nowrap;
}

.maps {
  margin-top: 0.15rem;
  color: var(--graphite);
  font-size: 0.8rem;
}

.more {
  margin-top: 0.5rem;
}

.more a {
  font-weight: 600;
}

.threats {
  margin-top: 2.75rem;
}

.threats > p {
  margin-bottom: 1rem;
  color: var(--graphite);
}

.tlist > li {
  display: grid;
  gap: 0.2rem;
  padding: 0.75rem 0.25rem;
  border-bottom: 1px solid var(--rule);
}

.ttitle {
  font-weight: 600;
}

.trefs,
.tby {
  color: var(--graphite);
  font-size: 0.85rem;
}

/* Reading pages */

.page {
  max-width: 50rem;
}

.page.wide {
  max-width: 66rem;
}

.page > h1 {
  margin-bottom: 0.5rem;
}

.lede {
  margin-bottom: 1.5rem;
  color: var(--graphite);
  font-size: 1.15rem;
}

.page h2 {
  margin-top: 2rem;
  margin-bottom: 0.6rem;
  padding-top: 0.6rem;
  border-top: 1px solid var(--rule);
}

.page h3 {
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

.page p + p {
  margin-top: 0.75rem;
}

.back {
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.pattern h1 .pid {
  margin-inline-end: 0.3rem;
  font-weight: 600;
}

.domain {
  margin: 0.2rem 0 1rem;
  color: var(--graphite);
}

.table-wrap {
  overflow-x: auto;
}

.index {
  width: 100%;
  border-collapse: collapse;
}

.index th {
  padding: 0.5rem 0.6rem;
  border-bottom: 2px solid var(--ink);
  color: var(--graphite);
  font-size: 0.85rem;
  font-weight: 600;
  text-align: start;
}

.index td {
  padding: 0.75rem 0.6rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

.index td.pid {
  width: 4rem;
}

.index td a {
  font-weight: 600;
}

.index td p {
  margin-top: 0.2rem;
  color: var(--graphite);
  font-size: 0.92rem;
}

.index td:last-child {
  color: var(--graphite);
  font-size: 0.92rem;
  white-space: nowrap;
}

.learn.page {
  max-width: 76rem;
}

.learn-grid {
  display: grid;
  gap: 1rem;
}

@media (min-width: 60rem) {
  .learn-grid {
    grid-template-columns: 1.1fr 1fr;
    gap: 4rem;
  }
}

.learn h2 {
  border-top: 2px solid var(--ink);
}

.steps,
.items {
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps {
  counter-reset: step;
}

.steps > li,
.items > li {
  padding-block: 0.8rem;
  border-bottom: 1px solid var(--rule);
}

.steps > li {
  display: grid;
  grid-template-columns: 2.1rem 1fr;
  column-gap: 0.75rem;
  counter-increment: step;
}

.steps > li::before {
  content: counter(step);
  grid-row: span 3;
}

html[lang="ar"] .steps > li::before {
  content: counter(step, arabic-indic);
}

.steps > li > * {
  grid-column: 2;
}

.steps a,
.items a {
  font-weight: 600;
}

.steps p,
.items p {
  margin-top: 0.15rem;
  color: var(--graphite);
  font-size: 0.95rem;
}

.search {
  display: grid;
  gap: 0.3rem;
  max-width: 26rem;
  margin: 1rem 0 1.5rem;
}

.search span {
  font-size: 0.95rem;
  font-weight: 600;
}

.search input {
  padding: 0.5rem 0.65rem;
  border: 1.5px solid var(--ink);
  border-radius: 2px;
  background: var(--sheet);
  color: var(--ink);
  font: inherit;
}

.terms {
  margin: 0;
  border-top: 2px solid var(--ink);
}

.term {
  padding-block: 0.8rem;
  border-bottom: 1px solid var(--rule);
}

.term dt {
  font-weight: 650;
}

.twin {
  margin-inline-start: 0.5rem;
  color: var(--graphite);
  font-weight: 400;
}

.term dd {
  margin: 0.2rem 0 0;
}

.empty {
  margin-top: 1rem;
  color: var(--graphite);
}

/* The plan. Every class here is emitted by assets/plan.js. */

.plan text {
  font-family: var(--font);
}

.pl-outside {
  fill: url(#pl-ground);
}

.pl-hatch {
  stroke: var(--rule);
  stroke-width: 1;
}

.pl-zone-label {
  fill: var(--graphite);
  font-size: 13px;
  font-weight: 600;
}

.pl-room {
  fill: var(--sheet);
  stroke: var(--ink);
}

.w1 {
  stroke-width: 2;
}

.w2 {
  stroke-width: 4;
}

.w3 {
  stroke-width: 6;
}

.w4 {
  stroke-width: 9;
}

.pl-room-label {
  fill: var(--ink);
  font-size: 13px;
  font-weight: 650;
}

.pl-fixture {
  fill: var(--sheet);
  stroke: var(--ink);
  stroke-width: 1.5;
}

.pl-fixture.pl-essential {
  fill: var(--ink);
}

.pl-fixture.pl-consider {
  stroke-dasharray: 5 4;
}

.pl-fixture.pl-structural {
  stroke: var(--graphite);
  stroke-width: 1;
}

.pl-fixture-label {
  fill: var(--ink);
  font-size: 11px;
  font-weight: 500;
}

.pl-fixture-label.pl-essential {
  fill: var(--sheet);
  font-weight: 600;
}

.pl-gap {
  fill: var(--sheet);
  stroke: none;
}

.pl-leaf {
  stroke: var(--ink);
  stroke-width: 2;
}

.pl-swing {
  fill: none;
  stroke: var(--graphite);
  stroke-width: 1;
  stroke-dasharray: 3 3;
}

.pl-tag {
  fill: var(--sheet);
  stroke: var(--ink);
  stroke-width: 1;
}

.pl-door-label {
  fill: var(--ink);
  font-size: 11px;
}

.pl-person {
  fill: var(--ink);
}

.pl-person-body {
  stroke: var(--ink);
  stroke-width: 2.5;
  stroke-linecap: round;
}

.pl-actor {
  fill: var(--ink);
  font-size: 12.5px;
  font-weight: 650;
}

.pl-entrance-label {
  fill: var(--graphite);
  font-size: 10.5px;
}

.pl-flow {
  stroke: var(--blue);
  stroke-width: 1.5;
}

.pl-arrowhead {
  fill: var(--blue);
}

.pl-corridor {
  stroke: var(--graphite);
  stroke-width: 1;
  stroke-dasharray: 8 5;
}

.pl-corridor-label {
  fill: var(--graphite);
  font-size: 11.5px;
}

.pl-service {
  stroke: var(--graphite);
  stroke-width: 1.2;
  stroke-dasharray: 4 3;
}

.pl-foundation {
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.5;
  stroke-dasharray: 10 6;
}

.pl-vault {
  fill: var(--sheet);
  stroke: var(--ink);
  stroke-width: 9;
}

.pl-vault-label {
  fill: var(--ink);
  font-size: 11.5px;
  font-weight: 650;
}

.pl-oneway {
  stroke: var(--ink);
  stroke-width: 2;
}


/* Refinements: brand, controls, and the pattern drawings */

::selection {
  background: var(--wash);
  color: var(--ink);
}

.plan-frame,
.diagram-canvas,
.table-wrap {
  scrollbar-color: var(--rule) transparent;
}

.brand-mark {
  flex: none;
  align-self: center;
  width: 1.75rem;
  height: 1.75rem;
}

.bm-wall {
  fill: none;
  stroke: var(--ink);
  stroke-width: 3;
  stroke-linecap: square;
}

.bm-door {
  fill: none;
  stroke: var(--blue);
  stroke-width: 1.5;
}

.brand .brand-mark {
  order: -2;
  margin-inline-end: 0.1rem;
}

.tb-mark .brand-mark {
  order: -2;
  width: 1.35rem;
  height: 1.35rem;
}

html[lang="en"] .tb-mark [lang="ar"],
html[lang="ar"] .tb-mark [lang="en"] {
  margin-inline-start: auto;
}

.colophon-brand {
  display: flex;
  flex-basis: 100%;
  align-items: center;
  gap: 0.6rem;
  color: var(--ink);
  font-weight: 600;
}

.colophon-brand .brand-mark {
  width: 1.4rem;
  height: 1.4rem;
}

.actions button {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.icon {
  flex: none;
  width: 1rem;
  height: 1rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.swipe {
  display: none;
  margin: 0 0.5rem 0.65rem;
  color: var(--graphite);
  font-size: 0.85rem;
}

@media (max-width: 63.99rem) {
  .swipe {
    display: block;
  }
}

@keyframes redraw {
  from {
    opacity: 0.2;
  }

  to {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .plan-frame.redraw .plan {
    animation: redraw 0.45s ease-out;
  }
}

/* Answers drawn in ink: a circle for one choice, a box for several. */
.opt input {
  appearance: none;
  display: grid;
  place-content: center;
  width: 1.05rem;
  height: 1.05rem;
  margin: 0.2rem 0 0;
  border: 1.5px solid var(--ink);
  background: var(--sheet);
  cursor: pointer;
}

.opt input[type="radio"] {
  border-radius: 50%;
}

.opt input[type="checkbox"] {
  border-radius: 2px;
}

.opt input::before {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  background: var(--ink);
  transform: scale(0);
}

.opt input[type="radio"]::before {
  border-radius: 50%;
}

.opt input[type="checkbox"]::before {
  width: 0.62rem;
  height: 0.62rem;
  clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%);
}

.opt input:checked::before {
  transform: scale(1);
}

.opt input:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

/* A pattern page: its drawing, the text, and a panel of facts. */
.pattern.page {
  max-width: 76rem;
}

.pattern > h1,
.pattern > .lede {
  max-width: 52rem;
}

.diagram {
  margin: 0.5rem 0 0;
  padding: 0.9rem 1rem 1rem;
  border: 2px solid var(--ink);
  background: var(--sheet);
  box-shadow: inset 0 0 0 5px var(--sheet), inset 0 0 0 6px var(--ink);
}

.diagram figcaption {
  margin-bottom: 0.9rem;
  padding: 0.2rem 0.35rem 0.6rem;
  border-bottom: 1px solid var(--ink);
  font-size: 0.95rem;
  font-weight: 650;
}

.diagram-canvas {
  overflow-x: auto;
}

.diagram-svg {
  display: block;
  width: 100%;
  min-width: 40rem;
  height: auto;
  max-height: 36rem;
  margin-inline: auto;
  font-family: var(--font);
  font-size: 15px;
}

@media (min-width: 64rem) {
  .diagram-svg {
    min-width: 0;
  }
}

.diagram-svg text {
  fill: var(--ink);
  text-anchor: middle;
}

.diagram-svg .node .label-container {
  fill: var(--sheet);
  stroke: var(--ink);
  stroke-width: 1.5;
}

.diagram-svg .cluster rect {
  fill: var(--paper);
  stroke: var(--graphite);
  stroke-width: 1;
  stroke-dasharray: 6 4;
}

.diagram-svg .cluster text {
  fill: var(--graphite);
  font-weight: 600;
}

.diagram-svg .flowchart-link {
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.3;
}

.diagram-svg .arrowMarkerPath {
  fill: var(--ink);
  stroke: none;
}

.diagram-svg .edgeLabel rect.background {
  fill: var(--sheet);
}

.diagram-svg .edgeLabel text {
  fill: var(--graphite);
  font-size: 14px;
}

.pattern-body {
  display: grid;
  gap: 1rem;
}

@media (min-width: 64rem) {
  .pattern-body {
    grid-template-columns: minmax(0, 1fr) 18rem;
    gap: 3.5rem;
  }
}

.pattern-main {
  max-width: 52rem;
}

.glance {
  align-self: start;
  margin-top: 2rem;
  padding: 0.9rem 1rem 1rem;
  border: 1.5px solid var(--ink);
  background: var(--sheet);
}

@media (min-width: 64rem) {
  .glance {
    position: sticky;
    top: 1.5rem;
  }
}

.page .glance h2 {
  margin: 0 0 0.7rem;
  padding: 0 0 0.5rem;
  border-top: 0;
  border-bottom: 1px solid var(--ink);
  font-size: 1rem;
}

.glance dl {
  display: grid;
  gap: 0.75rem;
  margin: 0;
}

.glance dt {
  color: var(--graphite);
  font-size: 0.78rem;
}

.glance dd {
  display: grid;
  gap: 0.15rem;
  margin: 0.1rem 0 0;
  font-weight: 600;
  font-size: 0.92rem;
}

.glance .row {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  font-weight: 500;
}

.glance .n {
  font-weight: 650;
  font-variant-numeric: tabular-nums;
}

.page .glance h3 {
  margin: 1.1rem 0 0.4rem;
  font-size: 0.9rem;
}

.plain {
  display: grid;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.92rem;
}


/* Interaction: the plan answers back */

.pl-item {
  cursor: pointer;
}

@media (prefers-reduced-motion: no-preference) {
  .pl-item {
    transition: opacity 0.18s ease;
  }
}

.plan-frame.focusing .pl-item:not(.hl) {
  opacity: 0.22;
}

.plan-frame.markup .pl-item:not(.hl) {
  opacity: 0.14;
}

.pl-item.hl :is(.pl-fixture, .pl-vault, .pl-tag),
.pl-item.is-new :is(.pl-fixture, .pl-vault, .pl-tag) {
  stroke: var(--red);
  stroke-width: 2.5;
}

.pl-item.hl .pl-fixture.pl-essential,
.pl-item.is-new .pl-fixture.pl-essential {
  fill: var(--red);
}

.pl-item.hl :is(.pl-leaf, .pl-swing, .pl-flow, .pl-corridor, .pl-service, .pl-oneway, .pl-person-body) {
  stroke: var(--red);
}

.pl-item.hl .pl-person {
  fill: var(--red);
}

@keyframes arrive {
  0% {
    opacity: 0;
  }

  40% {
    opacity: 1;
  }

  60% {
    opacity: 0.45;
  }

  100% {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .pl-item.is-new {
    animation: arrive 0.9s ease-out;
  }
}

.plan-note {
  display: grid;
  gap: 0.3rem;
  min-height: 2.9rem;
  margin: 0 0.5rem 0.75rem;
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--ink);
  border-inline-start: 4px solid var(--red);
  background: var(--sheet);
  font-size: 0.92rem;
  line-height: 1.5;
}

.plan-note .hint,
.note-label {
  color: var(--graphite);
}

.note-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.2rem 0.5rem;
}

.note-key {
  margin-inline-end: 0.3rem;
  color: var(--graphite);
  font-weight: 650;
}

.note-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.1rem;
  margin-top: 0.15rem;
}

.note-actions button,
.chips button {
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--ink);
  border-radius: 2px;
  background: transparent;
  color: var(--ink);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.note-actions button:hover,
.chips button:hover {
  background: var(--wash);
}

.changes {
  display: grid;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.chg::before {
  content: "";
  display: inline-block;
  width: 0.6rem;
  height: 0.6rem;
  margin-inline-end: 0.5rem;
  border: 1.5px solid var(--ink);
  vertical-align: 0.05em;
}

.chg-added::before {
  border-color: var(--red);
  background: var(--red);
}

.chg-removed {
  color: var(--graphite);
}

.chg-removed::before {
  border-style: dashed;
}

.examples {
  display: grid;
  gap: 0.45rem;
  margin: -0.5rem 0 1.9rem;
}

.examples > p {
  font-size: 0.95rem;
  font-weight: 600;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.chips button {
  border-radius: 999px;
  background: var(--sheet);
}

.mark-btn {
  display: inline-flex;
  justify-self: start;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.35rem;
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--red);
  border-radius: 2px;
  background: transparent;
  color: var(--red);
  font-size: 0.82rem;
  font-weight: 650;
  cursor: pointer;
}

.mark-btn:hover,
.mark-btn[aria-pressed="true"] {
  background: var(--red);
  color: var(--sheet);
}

.plist > li.hl .ptitle {
  color: var(--red);
}

@keyframes rowflash {
  from {
    background: var(--wash);
  }

  to {
    background: transparent;
  }
}

.plist > li.flash {
  animation: rowflash 1.8s ease-out;
}

/* The quiz, with a scale bar for progress */

.quiz.page {
  max-width: 48rem;
}

.quiz-link a {
  font-size: 1.05rem;
}

.quiz-card {
  display: grid;
  gap: 0.9rem;
  margin-top: 0.5rem;
  padding: 1.3rem 1.3rem 1.5rem;
  border: 2px solid var(--ink);
  background: var(--sheet);
  box-shadow: inset 0 0 0 5px var(--sheet), inset 0 0 0 6px var(--ink);
}

.scale {
  display: grid;
  grid-template-columns: repeat(10, 1fr);
  height: 0.75rem;
  border: 1.5px solid var(--ink);
}

.scale span + span {
  border-inline-start: 1px solid var(--ink);
}

.scale .ok {
  background: var(--ink);
}

.scale .miss {
  background: var(--red);
}

.scale .now {
  background: repeating-linear-gradient(45deg, var(--rule) 0 2px, transparent 2px 5px);
}

.quiz-progress {
  color: var(--graphite);
  font-size: 0.9rem;
}

.page .quiz-ask {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 1.2rem;
}

.quiz-prompt {
  margin: 0;
  padding: 0.8rem 1rem;
  border-inline-start: 3px solid var(--ink);
  background: var(--paper);
  font-size: 1.02rem;
}

.quiz-options {
  display: grid;
  gap: 0.5rem;
}

.quiz-option {
  display: grid;
  grid-template-columns: 1.8rem 1fr;
  align-items: center;
  gap: 0.65rem;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--ink);
  border-radius: 2px;
  background: var(--sheet);
  color: var(--ink);
  font-weight: 600;
  text-align: start;
  cursor: pointer;
}

.quiz-option:hover:not(:disabled) {
  background: var(--wash);
}

.quiz-option .key {
  display: grid;
  place-items: center;
  width: 1.65rem;
  height: 1.65rem;
  border: 1.5px solid var(--ink);
  border-radius: 50%;
  font-size: 0.8rem;
}

.quiz-option:disabled {
  cursor: default;
}

.quiz-option:disabled:not(.right, .wrong) {
  opacity: 0.5;
}

.quiz-option.right {
  background: var(--wash);
  box-shadow: inset 0 0 0 1.5px var(--ink);
}

.quiz-option.right .key {
  background: var(--ink);
  color: var(--sheet);
}

.quiz-option.wrong {
  border-color: var(--red);
  color: var(--red);
}

.quiz-option.wrong .key {
  border-color: var(--red);
  background: var(--red);
  color: var(--sheet);
}

.verdict {
  font-weight: 700;
}

.verdict.miss {
  color: var(--red);
}

.quiz-feedback {
  display: grid;
  gap: 0.6rem;
}

.quiz-feedback:empty {
  display: none;
}

.quiz-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
}

.quiz-go {
  padding: 0.5rem 1.05rem;
  border: 1.5px solid var(--ink);
  border-radius: 2px;
  background: var(--ink);
  color: var(--sheet);
  font-weight: 650;
  cursor: pointer;
}

.quiz-go:hover {
  border-color: var(--blue);
  background: var(--blue);
}

.page .quiz-score {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 1.5rem;
}

.quiz-keys {
  margin-top: 0.75rem;
  color: var(--graphite);
  font-size: 0.85rem;
}

@media (hover: none) {
  .quiz-keys {
    display: none;
  }
}

/* Print: the drawing sheet on one landscape page, then the pattern list. */

@media print {
  :root,
  :root[data-theme],
  :root:not([data-theme="light"]) {
    --paper: #fff;
    --sheet: #fff;
    --ink: #111;
    --graphite: #444;
    --rule: #bbb;
    --blue: #111;
    --wash: #eee;
    --red: #111;
    color-scheme: light;
  }

  @page {
    size: A4 landscape;
    margin: 10mm;
  }

  body {
    background: #fff;
    font-size: 10pt;
  }

  .masthead,
  .colophon,
  .skip,
  .intro,
  .actions,
  .toast,
  .questions,
  .threats > p,
  .swipe,
  .plan-note,
  .examples,
  .mark-btn,
  .more {
    display: none !important;
  }

  main {
    width: auto;
    padding: 0;
  }

  .sheet {
    padding: 8px;
    box-shadow: none;
    break-inside: avoid;
    break-after: page;
  }

  .sheet-head {
    padding-bottom: 2mm;
  }

  .plan-frame {
    overflow: visible;
    padding-block: 2mm;
  }

  .plan {
    min-width: 0;
    max-height: 104mm;
  }

  .sheet-foot {
    grid-template-columns: 1fr 72mm;
    gap: 6mm;
    padding-top: 3mm;
  }

  .legend ul {
    grid-template-columns: repeat(2, 1fr);
    gap: 1mm 5mm;
  }

  .legend li {
    font-size: 7.5pt;
  }

  .swatch {
    width: 9mm;
    height: 5mm;
  }

  .titleblock dl > div,
  .tb-mark {
    padding: 0.8mm 2mm;
  }

  .titleblock dt {
    font-size: 6.5pt;
  }

  .titleblock dd {
    font-size: 8.5pt;
  }

  .workspace {
    display: block;
    margin: 0;
  }

  .threats {
    break-before: page;
  }

  summary::after,
  .pbody {
    display: none;
  }

  a {
    color: inherit;
    text-decoration: none;
  }
}