:root {
  --bg: #f8f7ef;
  --bg-2: #efeee3;
  --ink: #173f34;
  --muted: #536158;
  --line: #d5d8c9;
  --control-line: #83917d;
  --seal: #397529;
  --seal-hover: #2b6020;
  --on-seal: #ffffff;
  --accent: #316b2a;
  --accent-hover: #204e1c;
  --selected: #e2ecd3;
  --stage: #f0efe6;
  --danger: #a85128;
  --danger-ink: #873c1c;
  --paper: #fffef8;
  --grass: #79a946;
  --shadow: 0 12px 40px rgb(34 64 36 / 8%);
  --font: "IBM Plex Sans", "Helvetica Neue", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --display: "Syne", "IBM Plex Sans", sans-serif;
  --tool-display: "Jersey 10", "IBM Plex Sans", sans-serif;
}

* { box-sizing: border-box; }
/* Use installed system CJK fonts; no additional font file or licence is bundled. */
html:lang(zh) {
  --font: "IBM Plex Sans", "PingFang SC", "PingFang TC", "Microsoft YaHei", "Noto Sans CJK SC", "Noto Sans CJK TC", sans-serif;
  --display: var(--font);
  --tool-display: var(--font);
  --mono: "IBM Plex Mono", "PingFang SC", "PingFang TC", "Microsoft YaHei", monospace;
}
html:lang(zh-Hant) {
  --font: "IBM Plex Sans", "PingFang TC", "Microsoft JhengHei", "Noto Sans CJK TC", sans-serif;
  --mono: "IBM Plex Mono", "PingFang TC", "Microsoft JhengHei", monospace;
}
html:lang(ja) {
  --font: "IBM Plex Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Meiryo", "Noto Sans CJK JP", sans-serif;
  --display: var(--font);
  --tool-display: var(--font);
  --mono: "IBM Plex Mono", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Noto Sans Mono CJK JP", monospace;
}
html:lang(ko) {
  --font: "IBM Plex Sans", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans CJK KR", sans-serif;
  --display: var(--font);
  --tool-display: var(--font);
  --mono: "IBM Plex Mono", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans Mono CJK KR", monospace;
  word-break: keep-all;
  overflow-wrap: anywhere;
}
/* The bundled Plex fonts cover Cyrillic; Jersey 10 does not. */
html:lang(ru) {
  --display: var(--font);
  --tool-display: var(--font);
}
html:lang(ru) :is(h1, h2, h3) { letter-spacing: 0; }
html:lang(ru) :is(.tool-title, .build-mode-heading h2) { font-size: 26px; font-weight: 600; }
html:lang(ru) .nav { font-size: 18px; font-weight: 600; }
html:lang(de) :is(p, label, legend, h1, h2, h3),
html:lang(ru) :is(p, label, legend, h1, h2, h3) { overflow-wrap: anywhere; hyphens: auto; }
html:is(:lang(de), :lang(ru), :lang(ja), :lang(ko)) .world-banner { height: auto; min-height: 150px; }
html:is(:lang(de), :lang(ru), :lang(ja), :lang(ko)) .world-banner-copy { min-height: inherit; }
html:lang(ru) .world-banner-title { font-size: clamp(26px, 3vw, 40px); line-height: 1.1; font-weight: 600; }
.language-switch {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  align-items: center;
  gap: 4px;
  grid-column: 1 / -1;
  padding: 4px 0;
  font-family: var(--font);
  font-size: 13px;
  line-height: 1.5;
}
.language-switch > a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 6px 12px;
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--ink);
  background: var(--paper);
  text-decoration: none;
}
.language-switch > a:hover { border-color: var(--control-line); }
.language-switch > a[aria-current="true"] { border-color: var(--seal); background: var(--selected); font-weight: 600; }
.language-switch a:focus-visible { outline: 2px solid var(--seal); outline-offset: 2px; }
.language-status { flex-basis: 100%; margin: 0; padding: 10px; background: var(--paper); color: var(--danger-ink); }
.language-status a { display: inline-flex; min-height: 44px; align-items: center; font-weight: 600; }
html:is(:lang(zh), :lang(ja), :lang(ko)) .nav { font-size: 18px; font-weight: 600; }
html:is(:lang(zh), :lang(ja), :lang(ko)) :is(h1, h2, h3) { letter-spacing: 0; }
html:is(:lang(zh), :lang(ja), :lang(ko)) :is(.tool-title, .build-mode-heading h2) { font-size: 26px; font-weight: 600; }
html:is(:lang(zh), :lang(ja), :lang(ko)) .world-banner-title { font-size: clamp(26px, 3vw, 40px); font-weight: 600; }
@media (max-width: 540px) {
  .language-switch { justify-content: center; }
  html:is(:lang(zh), :lang(ja), :lang(ko)) .nav { font-size: 16px; }
  html:lang(ru) .nav { font-size: 15px; }
  html:is(:lang(de), :lang(ru)) .nav a { overflow-wrap: anywhere; hyphens: auto; }
}
html { color-scheme: light; }
body {
  container-type: inline-size;
  margin: 0;
  min-height: 100vh;
  background: #eaeedf;
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
}

a { color: var(--accent); }
a:hover { color: var(--accent-hover); }
.skip {
  position: absolute;
  left: -999px;
  top: 0;
}
.skip:focus {
  left: 12px;
  top: 12px;
  background: var(--bg-2);
  padding: 8px 12px;
  z-index: 20;
}

.wrap {
  width: min(1320px, calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  min-height: 88px;
  padding: 12px 8px;
}
.site-header::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0 calc((100% - 100cqw) / 2);
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  justify-self: start;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  text-decoration: none;
  color: var(--ink);
}
.brand-logo {
  display: block;
  width: min(240px, 58vw);
  height: auto;
}
.brand .tagline {
  display: none;
}
.nav {
  grid-column: 2;
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 12px;
  font-family: var(--tool-display);
  font-size: 26px;
  font-weight: 400;
  font-synthesis: none;
  line-height: 1.1;
}
.nav a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  gap: 12px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: 4px;
  background: transparent;
  color: var(--ink);
  text-decoration: none;
  text-align: center;
  white-space: nowrap;
  transition: background-color 140ms ease, border-color 140ms ease;
}
.nav img { width: 24px; height: 24px; flex-shrink: 0; }
.nav a:hover {
  color: var(--accent);
  background: var(--selected);
}
.nav a[aria-current="page"] {
  color: var(--accent);
  background: var(--selected);
  border-color: transparent;
  box-shadow: inset 0 -3px var(--grass);
}

.has-world {
  /* A layout container would make fixed descendants follow the long page. */
  container-type: normal;
  isolation: isolate;
}
.world-backdrop {
  position: fixed;
  z-index: -1;
  inset: 0;
  overflow: hidden;
  background: #d8e7df;
  pointer-events: none;
}
.world-backdrop picture, .world-backdrop img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.world-backdrop img { object-fit: cover; object-position: 50% 50%; }
.world-backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgb(248 247 239 / 32%), rgb(248 247 239 / 12%) 35%, transparent 70%);
}
.has-world .site-header::before {
  inset: 0;
  background: rgb(255 254 248 / 94%);
  border: 1px solid rgb(255 254 248 / 85%);
  border-radius: 0 0 5px 5px;
}
.world-banner {
  position: relative;
  height: 164px;
}
.world-banner-copy {
  position: relative;
  z-index: 2;
  display: flex;
  height: 100%;
  justify-content: center;
  flex-direction: column;
  width: 100%;
  margin: auto;
  padding: 10px 28px 24px;
}
.world-banner-title {
  margin: 0;
  max-width: 18ch;
  color: #173f34;
  font: 400 clamp(34px, 3.6vw, 48px)/0.94 var(--tool-display);
  font-synthesis: none;
  letter-spacing: 0;
}
.world-banner-note { margin: 9px 0 0; max-width: 42ch; color: var(--ink); font-size: 14px; }

.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 32px;
  padding: 48px 0 28px;
}
.kicker {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
h1, h2, h3 { font-family: var(--display); font-weight: 700; letter-spacing: -0.04em; }
h1 { font-size: clamp(32px, 5vw, 48px); line-height: 1.05; margin: 8px 0 14px; }
.hero h1 { font-size: clamp(36px, 6vw, 64px); line-height: 0.95; }
.panel h1 {
  font-size: 28px;
  line-height: 1.08;
  overflow-wrap: anywhere;
  max-width: 100%;
}
h2 { font-size: 28px; margin: 0 0 10px; }
h3 { font-size: 18px; margin: 0 0 8px; }
.tool-title {
  font-family: var(--tool-display);
  font-weight: 400;
  font-synthesis: none;
  letter-spacing: 0;
  line-height: 1.12;
  text-wrap: balance;
}
.panel .tool-title {
  font-size: clamp(26px, 4.2vw, 34px);
  overflow-wrap: anywhere;
  max-width: 100%;
}
.tool-card .tool-title { font-size: 32px; }
.hero .tool-card .tool-title { font-size: 36px; }
.lede { color: var(--muted); max-width: 46ch; }
.prose-page { max-width: 72ch; padding: 36px 28px; margin: 28px 0; background: var(--paper); border: 1px solid var(--line); }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  padding-bottom: 48px;
}
.tool-card {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 18px;
  text-decoration: none;
  color: inherit;
  min-height: 180px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-radius: 4px;
}
.tool-card:hover { border-color: var(--seal); color: var(--ink); }
.tool-grid .tool-card { justify-content: flex-start; gap: 16px; }
.tool-card small { color: var(--muted); font-family: var(--mono); font-size: 12px; }
.tool-card p { margin: 10px 0 0; color: var(--muted); }

.layout {
  position: relative;
  display: grid;
  grid-template-columns: 292px minmax(0, 1fr);
  gap: 24px;
  padding: 22px;
  margin: -14px 0 40px;
  background: var(--paper);
  border: 1px solid #fff;
  box-shadow: var(--shadow);
  border-radius: 5px;
}
.layout::before, .layout::after {
  content: "";
  position: absolute;
  top: 6px;
  width: 7px;
  height: 7px;
  background: #e0e3d4;
  pointer-events: none;
}
.layout::before { left: 6px; box-shadow: 7px 0 #eceee3, 0 7px #eceee3; }
.layout::after { right: 6px; box-shadow: -7px 0 #eceee3, 0 7px #eceee3; }
.layout > * { min-width: 0; }
.has-world .layout { background: rgb(255 254 248 / 95%); }
.panel {
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 18px;
  position: sticky;
  top: 20px;
  align-self: start;
  border-radius: 3px;
}
label,
.label-like { display: block; font-size: 14px; color: var(--ink); margin: 12px 0 6px; }
textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 8px 10px;
  font-family: var(--mono);
  font-size: 12px;
  resize: vertical;
}
input, select, button, textarea {
  font: inherit;
  color: var(--ink);
}
input[type="number"],
input[type="text"],
select {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--control-line);
  padding: 8px 10px;
  border-radius: 3px;
  min-height: 44px;
}
input[type="checkbox"] { accent-color: var(--seal); }
.range-control { margin-top: 12px; }
.range-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.range-heading label { margin: 0; }
.range-heading input[type="number"] {
  flex: 0 0 76px;
  width: 76px;
  min-height: 44px;
  text-align: center;
  font-family: var(--mono);
  appearance: textfield;
}
.range-heading input::-webkit-inner-spin-button,
.range-heading input::-webkit-outer-spin-button { appearance: none; margin: 0; }
.range-adjust {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 44px;
  align-items: center;
  gap: 10px;
  margin-top: 4px;
}
.step-button {
  width: 44px;
  height: 44px;
  border: 1px solid var(--control-line);
  border-radius: 3px;
  background: var(--paper);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  touch-action: manipulation;
}
.step-button:not(:disabled):hover { border-color: var(--accent); }
.step-button:disabled { opacity: 0.45; cursor: not-allowed; }
.range-adjust input[type="range"] {
  appearance: none;
  width: 100%;
  min-width: 0;
  height: 44px;
  margin: 0;
  background: transparent;
  cursor: pointer;
}
.range-adjust input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  background: #c9d0bc;
  border-radius: 3px;
}
.range-adjust input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 26px;
  height: 26px;
  margin-top: -10px;
  border: 2px solid var(--on-seal);
  border-radius: 50%;
  background: var(--seal);
}
.range-adjust input[type="range"]::-moz-range-track {
  height: 6px;
  background: #c9d0bc;
  border-radius: 3px;
}
.range-adjust input[type="range"]::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border: 2px solid var(--on-seal);
  border-radius: 50%;
  background: var(--seal);
}
.range-adjust input[type="range"]:disabled { cursor: not-allowed; }
.range-heading input[aria-invalid="true"] { border-color: var(--danger); }
.field-error { margin: 4px 0 0; color: var(--danger-ink); font-size: 12px; }
.oval-toggle { display: flex; align-items: center; min-height: 44px; gap: 8px; margin: 4px 0; }
.oval-toggle input { width: 18px; height: 18px; margin: 0; }
.planner-group { min-width: 0; margin: 20px 0 0; padding: 0; border: 0; }
.planner-group legend { padding: 0; font-size: 15px; font-weight: 600; }
.planner-group legend span { margin-left: 8px; color: var(--muted); font-size: 12px; font-weight: 400; }
.planner-group .oval-toggle { margin: 4px 0 0; }
.planner-group .oval-toggle + .range-control { margin-top: 0; }
.world-coordinate-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 10px; }
.world-coordinate-fields > div { min-width: 0; }
.world-coordinate-fields label { margin: 4px 0 6px; }
.world-coordinate-fields input { min-width: 0; font-family: var(--mono); font-size: 16px; font-variant-numeric: tabular-nums; }
.world-coordinate-fields input[aria-invalid="true"] { border-color: var(--danger); }
.world-coordinate-fields .planner-help { grid-column: 1 / -1; }
.world-coordinate-fields[hidden],
.world-coordinate-summary[hidden],
.world-coordinate-warning[hidden],
#world-coordinate-error[hidden] { display: none; }
.planner-materials { margin-top: 24px; padding-top: 12px; border-top: 1px solid var(--line); }
.planner-materials legend { padding-right: 10px; }
.planner-help { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.5; }
.planner-materials .lede { margin-bottom: 0; }
#layer-need { padding: 12px; border: 1px solid var(--line); border-radius: 3px; background: var(--bg-2); font-size: 14px; }
.owned-materials { margin-top: 16px; }
.owned-materials label { margin: 0 0 6px; }
.owned-materials input { min-width: 0; font-family: var(--mono); font-size: 16px; font-variant-numeric: tabular-nums; }
.owned-materials input[aria-invalid="true"] { border-color: var(--danger); }
.owned-materials .planner-help { margin-top: 6px; }
.material-balance { margin: 10px 0 0; padding: 10px 12px; border-left: 3px solid var(--seal); background: var(--selected); color: var(--ink); font-size: 14px; overflow-wrap: anywhere; }
.material-balance:empty { display: none; }
.blueprint-jump { display: none; }
.resume-plan { margin: 16px 0; padding: 12px; border: 1px solid var(--control-line); border-left: 3px solid var(--seal); border-radius: 3px; background: var(--selected); }
.resume-plan[hidden] { display: none; }
.resume-plan > strong { font-size: 15px; }
.resume-plan p { margin: 6px 0 10px; font-size: 14px; overflow-wrap: anywhere; }
.resume-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.resume-actions .btn { margin: 0; font-size: 14px; }
.session-status { margin: 12px 0 0; font-size: 13px; color: var(--muted); overflow-wrap: anywhere; }
.session-status:empty { display: none; }
.build-mode-entry { width: 100%; }
.build-mode-bar { margin-bottom: 12px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
.build-mode-bar[hidden] { display: none; }
.build-mode-heading { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; }
.build-mode-heading > div { min-width: 0; }
.build-mode-heading h2 { margin: 0; font-family: var(--tool-display); font-size: 32px; font-weight: 400; font-synthesis: none; letter-spacing: 0; line-height: 1.1; }
.build-mode-heading p { margin: 6px 0 0; font-size: 14px; color: var(--muted); overflow-wrap: anywhere; }
.build-mode-heading .btn { flex-shrink: 0; margin: 0; }
a:focus-visible, input:focus, select:focus, textarea:focus, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.toggle {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}
.toggle button,
.btn {
  background: var(--paper);
  border: 1px solid var(--control-line);
  padding: 8px 10px;
  border-radius: 3px;
  cursor: pointer;
  min-height: 44px;
  box-shadow: 0 2px 0 rgb(38 65 37 / 7%);
  transition: background-color 140ms ease, border-color 140ms ease;
}
.toggle button:not(:disabled):hover,
.btn:not(:disabled):hover { border-color: var(--accent); }
.toggle button[aria-pressed="true"],
.btn.primary {
  background: var(--seal);
  color: var(--on-seal);
  border-color: var(--seal);
}
.toggle button[aria-pressed="true"]:hover,
.btn.primary:not(:disabled):hover { background: var(--seal-hover); border-color: var(--seal-hover); }
.btn { margin-top: 12px; }
.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin-bottom: 14px;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 4px;
}
.stat {
  min-width: 0;
  position: relative;
  padding: 14px;
}
.stat + .stat::before { content: ""; position: absolute; left: 0; top: 18px; bottom: 18px; width: 1px; background: var(--line); }
.stat b {
  display: block;
  font-family: var(--mono);
  font-weight: 600;
  font-size: clamp(15px, 1.5vw, 20px);
  overflow-wrap: break-word;
  text-wrap: balance;
}
.stat span { color: var(--muted); font-size: 12px; }
.circle-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.circle-stats .stat {
  /* Reserve room for wrapped stack counts so updates do not move the blueprint. */
  height: 100px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 4px;
}
.circle-stats .stat b {
  line-height: 1.25;
  font-variant-numeric: tabular-nums;
}
.blueprint-tools {
  display: grid;
  grid-template-columns: 224px minmax(240px, 1fr) auto;
  align-items: flex-start;
  gap: 8px 16px;
  padding: 4px 0 12px;
}
.blueprint-tools label,
.blueprint-tools .label-like { margin: 0 0 6px; }
.blueprint-tools .toggle { margin: 0; }
.blueprint-tools .toggle button { min-height: 44px; padding: 9px 14px; }
.blueprint-thickness { width: auto; margin: 0; display: grid; grid-template-columns: minmax(0, 1fr) 64px; gap: 6px 8px; }
.blueprint-thickness .range-heading { display: contents; }
.blueprint-thickness .range-heading label { grid-column: 1 / -1; }
.blueprint-thickness .range-heading input { grid-column: 2; grid-row: 2; width: 64px; }
.blueprint-thickness .range-adjust { grid-column: 1; grid-row: 2; margin: 0; gap: 6px; }
.blueprint-thickness .field-error { grid-column: 1 / -1; }
.blueprint-thickness .range-heading label { margin: 0; }
.blueprint-thickness input { min-height: 44px; }
.blueprint-hint {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}
#thickness-adjustment { color: var(--accent); }
.blueprint-tools .alert { grid-column: 1 / -1; margin: 0; }
.blueprint-options { display: contents; }
.blueprint-guides {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0 16px;
  min-width: 0;
}
.blueprint-guides label {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  margin: 0;
  color: var(--ink);
  cursor: pointer;
}
.blueprint-guides input { width: 18px; height: 18px; margin: 0; }
.blueprint-guides p { margin: 0; max-width: 36ch; font-size: 12px; color: var(--muted); }
.blueprint-view { grid-column: 3; grid-row: 1; align-self: end; display: flex; align-items: center; gap: 6px; }
.blueprint-view .btn { margin: 0; min-width: 44px; min-height: 44px; }
.blueprint-view .btn[aria-pressed="true"] { border-color: var(--accent); }
.zoom-help { margin: 0; color: var(--muted); font-size: 12px; }
.blueprint-notes { padding: 10px 12px; border: 1px solid var(--line); border-top: 0; background: var(--bg); }
.blueprint-notes p { margin: 0; color: var(--muted); font-size: 12px; }
.blueprint-notes p + p { margin-top: 4px; }
.blueprint-notes .grid-number-help { padding: 0; }
.stage:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.grid-number-help { margin: 0; padding: 8px 0; color: var(--muted); font-size: 12px; }
.blueprint-frame { position: relative; display: grid; grid-template-columns: 34px minmax(0, 1fr); grid-template-rows: 28px auto; }
.blueprint-frame .stage { grid-area: 2 / 2; min-width: 0; }
.ruler-corner, .grid-ruler { background: var(--bg-2); color: var(--muted); font-family: var(--mono); font-size: 11px; font-variant-numeric: tabular-nums; }
.ruler-corner { display: grid; place-items: center; border: 1px solid var(--line); border-right: 0; border-bottom: 0; font-size: 10px; }
.grid-ruler { position: relative; overflow: hidden; pointer-events: none; }
.column-ruler { grid-area: 1 / 2; border: 1px solid var(--line); border-bottom: 0; }
.row-ruler { grid-area: 2 / 1; border: 1px solid var(--line); border-right: 0; }
.grid-ruler span { position: absolute; line-height: 16px; white-space: nowrap; }
.column-ruler span { top: 50%; transform: translate(-50%, -50%); }
.row-ruler span { right: 5px; transform: translateY(-50%); }
.row-ruler span[aria-current="true"] { color: var(--accent); font-weight: 600; }
.cell-numbers { grid-area: 2 / 2; position: absolute; inset: 1px; overflow: hidden; pointer-events: none; font-family: var(--mono); font-size: 11px; font-weight: 600; font-variant-numeric: tabular-nums; }
.cell-numbers span { position: absolute; transform: translate(-50%, -50%); line-height: 14px; color: #153f32; background: #83b34e; border-radius: 2px; white-space: nowrap; }
.cell-numbers[data-done="true"] span { color: #153f32; background: #9eaf90; }
#blueprint { scroll-margin-top: 16px; }
.stage {
  border: 1px solid var(--line);
  background: var(--stage);
  overflow: auto;
  padding: 12px;
  touch-action: manipulation;
}
canvas {
  image-rendering: pixelated;
  display: block;
  margin: 0 auto;
  height: auto;
}
.export-bar {
  border: 1px solid var(--line);
  border-top: 0;
  padding: 12px;
  background: var(--bg);
}
.export-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.export-actions .btn { min-height: 44px; margin-top: 0; }
.export-hint { margin: 10px 0 0; color: var(--muted); font-size: 12px; }
.export-bar .copy-ok { margin: 8px 0 0; }
.export-bar .copy-ok:empty { display: none; }
.export-open:not([hidden]) { display: inline-flex; align-items: center; min-height: 44px; margin-top: 4px; }
.rows {
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 13px;
  overflow: auto;
}
.rows table { width: 100%; border-collapse: collapse; }
.rows th, .rows td {
  text-align: left;
  padding: 6px 8px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.note, .faq, .prose {
  color: var(--muted);
  padding-bottom: 48px;
}
.faq.wrap { width: 100%; margin: 0 0 32px; padding: 28px; border: 1px solid var(--line); background: var(--bg); border-radius: 4px; }
.faq h2, .prose h1, .prose h2 { color: var(--ink); }
.faq details {
  border-top: 1px solid var(--line);
  padding: 12px 0;
}
.faq summary { cursor: pointer; color: var(--ink); }
.faq h3 { padding-top: 16px; border-top: 1px solid var(--line); color: var(--ink); }
.reference-table-wrap { overflow-x: auto; margin: 20px 0; }
.reference-table { width: 100%; min-width: 36rem; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.reference-table caption { text-align: left; margin-bottom: 10px; color: var(--ink); font-weight: 600; }
.reference-table th, .reference-table td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.reference-table thead { background: var(--bg-2); color: var(--ink); }
.reference-table tbody th { color: var(--ink); }
.alert {
  border: 1px solid var(--danger);
  color: var(--danger-ink);
  padding: 10px 12px;
  margin: 8px 0;
  display: none;
}
.alert.show { display: block; }
.copy-ok { color: var(--ink); font-size: 13px; min-height: 1.2em; }
.tool-feedback {
  margin-top: 20px;
  padding: 0 0 12px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}
.tool-feedback summary {
  padding: 12px 0;
  min-height: 44px;
  cursor: pointer;
}
.tool-feedback summary:hover { color: var(--accent); }
.tool-feedback summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.tool-feedback p { margin: 4px 0 12px; }
.tool-feedback .btn {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  margin: 0 0 8px;
  color: var(--ink);
  text-decoration: none;
}
.tool-feedback .feedback-help { font-size: 13px; overflow-wrap: anywhere; }
.tool-feedback textarea { display: block; font-size: 16px; margin-bottom: 10px; }
.tool-feedback .feedback-status { min-height: 1.5em; color: var(--ink); }
.site-footer {
  border-top: 1px solid var(--line);
  padding: 20px 0 32px;
  color: var(--muted);
  font-size: 13px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.has-world .site-footer {
  padding: 20px 24px 24px;
  margin-bottom: 20px;
  background: rgb(255 254 248 / 96%);
  border: 1px solid var(--line);
  border-radius: 4px;
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 16px;
}
.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}
.footer-links a[aria-current="page"] {
  color: var(--ink);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}
.footer-notices {
  flex-basis: 100%;
  min-width: 0;
  font-size: 14px;
  line-height: 1.6;
}
.footer-notices p { margin: 0; }
.footer-notices .visual-credit {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  column-gap: 8px;
}
.visual-credit a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}
.visual-credit a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.build-bar {
  margin-top: 12px;
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 12px;
  border-radius: 3px;
}
.build-bar strong {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 18px;
  display: block;
}
.build-bar p { margin: 6px 0 10px; color: var(--muted); }
.layer-controls { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px 16px; }
.layer-selection { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; min-width: 0; }
.layer-selection label { margin: 0; font-weight: 600; }
.layer-selection input { width: 76px; min-width: 0; text-align: center; font-family: var(--mono); font-size: 16px; font-variant-numeric: tabular-nums; }
.layer-selection input[aria-invalid="true"] { border-color: var(--danger); }
#layer-total { color: var(--muted); font-size: 14px; font-variant-numeric: tabular-nums; }
.layer-navigation { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; min-width: 0; }
.layer-navigation .btn { min-width: 0; min-height: 44px; margin: 0; font-size: 14px; line-height: 1.35; touch-action: manipulation; }
.build-bar #layer-error { margin: 6px 0 0; color: var(--danger-ink); }
.build-bar .layer-progress-summary { margin: 10px 0 12px; padding-bottom: 12px; border-bottom: 1px solid var(--line); color: var(--ink); font-size: 14px; line-height: 1.5; overflow-wrap: anywhere; }
.build-bar .layer-storage-note { margin: 0 0 12px; padding: 10px 12px; border-left: 3px solid var(--seal); background: var(--selected); color: var(--ink); font-size: 13px; line-height: 1.5; overflow-wrap: anywhere; }
.layer-storage-note:empty { display: none; }
#continue-layer { min-height: 44px; touch-action: manipulation; }
#continue-layer[hidden], #layer-error[hidden], #owned-error[hidden] { display: none; }
.build-bar .world-coordinate-summary {
  margin: 8px 0;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--bg-2);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}
.build-bar .world-coordinate-warning { margin: 8px 0; color: var(--danger-ink); font-size: 13px; overflow-wrap: anywhere; }
.build-bar .row-segments-note { margin: 12px 0 6px; font-size: 12px; }
.row-segments { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; margin: 0; padding: 0; }
.row-segments[hidden] { display: none; }
.row-segments li { min-width: 0; max-width: 100%; padding: 8px 12px; border: 1px solid var(--control-line); border-left: 3px solid var(--accent); background: var(--stage); }
.row-segments strong { font-size: 17px; font-variant-numeric: tabular-nums; }
.row-segments span { display: block; color: var(--muted); font-size: 13px; }
.row-segments .world-coordinate-range { margin-top: 6px; padding-top: 6px; border-top: 1px solid var(--line); color: var(--ink); font-family: var(--mono); font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.build-actions, .progress-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.build-actions .btn, .progress-actions .btn { min-height: 44px; }
#progress-status:empty { display: none; }
.rows caption {
  text-align: left;
  color: var(--muted);
  font-family: var(--font);
  padding-bottom: 8px;
}
.rows tr { cursor: pointer; }
.rows tr:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.rows tr.current td { background: var(--selected); }
.rows tr.done td { color: var(--muted); text-decoration: line-through; }
input:disabled { opacity: 0.45; cursor: not-allowed; }

/* Construction guides share the quiet paper/green treatment of the calculators. */
.panel.portal-pair { position: static; margin: 0 0 32px; padding: 22px; border: 1px solid var(--line); background: var(--paper); }
.portal-pair h2, .beacon-build h2 { margin: 0 0 8px; font-size: 24px; }
.portal-pair .lede { max-width: 75ch; }
.portal-pair-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 18px 0; }
.portal-pair-entrance { min-width: 0; padding: 16px; border: 1px solid var(--line); border-top: 3px solid var(--seal); background: var(--paper); }
.portal-pair-entrance h3 { margin: 0 0 10px; font-size: 17px; }
.portal-pair-entrance .btn { min-height: 44px; margin-bottom: 0; }
.portal-pair-coordinates { font-family: var(--mono); font-size: 16px; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.portal-pair-entrance .lede { font-size: 14px; overflow-wrap: anywhere; }
.portal-pair-status { color: var(--ink); overflow-wrap: anywhere; }
.portal-pair-status:empty { display: none; }
.portal-pair-checklist { min-width: 0; padding: 16px; border: 1px solid var(--line); }
.portal-pair-checklist legend { padding: 0 8px; font-weight: 600; }
.portal-pair-check { display: flex; align-items: flex-start; gap: 10px; min-height: 44px; margin: 0; padding: 10px 0; cursor: pointer; }
.portal-pair-check + .portal-pair-check { border-top: 1px solid var(--line); }
.portal-pair-check input { flex: 0 0 18px; width: 18px; height: 18px; margin: 2px 0 0; }
.portal-pair-checklist:disabled .portal-pair-check { cursor: not-allowed; color: var(--muted); }
.portal-pair-actions, .beacon-layer-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.portal-pair-actions .btn, .beacon-layer-actions .btn { min-height: 44px; }
.portal-pair-notes { margin-top: 16px; border-top: 1px solid var(--line); }
.portal-pair-notes summary { min-height: 44px; padding-block: 12px; cursor: pointer; }
.portal-pair-notes textarea { font-family: var(--mono); font-size: 13px; }
.beacon-session, .beacon-build, .beacon-inventory { min-width: 0; margin-top: 18px; padding: 16px; border: 1px solid var(--line); border-radius: 3px; background: var(--bg); }
.beacon-session, .beacon-build, .beacon-inventory { display: block; min-height: 0; }
.beacon-layer-choice strong, .beacon-layer-choice span { display: block; }
.beacon-layer-choice span { font-size: 13px; }
.beacon-layer-choice strong { margin-bottom: 4px; }
.beacon-controls { position: static; }
.beacon-inventory .feedback-help, .beacon-build .feedback-help { font-size: 13px; line-height: 1.5; }
.beacon-inventory { padding: 12px; }
.beacon-inventory h2 { font-size: 18px; margin-top: 0; }
.beacon-layer-diagram { overflow: hidden; }
.beacon-session { border-left: 3px solid var(--seal); }
.beacon-session[hidden], .beacon-storage-note:empty { display: none; }
.beacon-layer-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; margin: 16px 0; padding: 0; list-style: none; }
.beacon-layer-list > * { min-width: 0; }
.beacon-layer-choice { width: 100%; min-height: 60px; padding: 10px 12px; border: 1px solid var(--control-line); border-radius: 3px; text-align: left; background: var(--paper); cursor: pointer; font-size: 14px; line-height: 1.5; }
.beacon-layer-choice[aria-pressed="true"] { border-color: var(--seal); background: var(--selected); box-shadow: inset 3px 0 var(--seal); }
.beacon-blueprint { display: block; width: 100%; max-width: 400px; height: auto; margin: 16px auto; color: var(--seal); background: var(--stage); }
.beacon-progress-summary { padding-block: 10px; border-bottom: 1px solid var(--line); color: var(--ink); font-variant-numeric: tabular-nums; }
.beacon-storage-note { color: var(--muted); font-size: 14px; overflow-wrap: anywhere; }
.beacon-inventory input { font-family: var(--mono); font-size: 16px; }
.beacon-inventory input[aria-invalid="true"] { border-color: var(--danger); }
@media (max-width: 540px) {
  .panel.portal-pair { padding: 16px; }
  .portal-pair-grid { grid-template-columns: minmax(0, 1fr); }
  .portal-pair-checklist { padding: 10px; }
  .beacon-layer-actions .btn { flex: 1 1 120px; }
  .beacon-layer-choice { padding: 8px; }
}

@media (max-height: 800px) {
  .circle-controls { position: static; }
  .world-banner { height: 126px; }
  .world-banner-title { font-size: 36px; }
  .world-banner-copy { padding-block: 8px 16px; }
}

@media (max-width: 540px) {
  .layer-controls { align-items: stretch; }
  .layer-selection, .layer-navigation { width: 100%; }
  .layer-selection input { flex: 0 0 76px; }
  #continue-layer { width: 100%; }
  .export-actions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .export-actions .btn { padding-inline: 6px; font-size: 14px; }
  .blueprint-style { width: 100%; }
  .blueprint-tools .toggle button { flex: 1; }
  .blueprint-thickness {
    width: 100%;
    margin-left: 0;
  }
  .blueprint-tools { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .blueprint-thickness { grid-template-columns: minmax(0, 1fr) 64px; }
  .blueprint-options { align-items: flex-start; flex-direction: column; gap: 8px; }
  .blueprint-view { grid-column: 1; grid-row: auto; }
  .blueprint-guides { gap: 0; }
  .blueprint-guides p { max-width: none; flex-basis: 100%; }
  .circle-stats .stat { height: 90px; padding: 12px; }
  .stat b { font-size: 18px; }
  .stats .stat:nth-child(3)::before { display: none; }
  .stats .stat:nth-child(n+3) { border-top: 1px solid var(--line); }
}

@media (max-width: 360px) {
  .world-coordinate-fields { grid-template-columns: minmax(0, 1fr); }
  /* Keep maximum material counts and stack remainders inside fixed-height cards. */
  .circle-stats .stat { padding-inline: 10px; }
  .circle-stats .stat b { font-size: 15px; }
  /* Fit 128 cells with a visible block and gap even on a 1x, 320px screen. */
  .stage { padding-inline: 4px; }
}

@media (max-width: 1000px) {
  .site-header { grid-template-columns: minmax(0, 1fr); gap: 8px; padding: 10px 0; }
  .brand { justify-self: center; }
  .brand-logo { width: 214px; }
  .nav {
    grid-column: 1;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    justify-self: center;
    width: min(100%, 560px);
    font-size: 24px;
    gap: 6px;
  }
  .nav a { min-height: 48px; padding: 8px 6px; gap: 8px; white-space: normal; text-wrap: balance; }
  .nav img { width: 20px; height: 20px; }
}

@media (min-width: 861px) and (max-width: 1100px) {
  .circle-stats .stat b { font-size: 16px; }
}

@media (max-width: 860px) {
  .hero, .layout, .tool-grid { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .panel { position: static; }
  .blueprint-jump { display: inline-flex; align-items: center; min-height: 44px; margin-right: 12px; }
  .layout { padding: 16px; gap: 20px; }
  .panel { padding: 16px; }
  .world-banner { height: 118px; }
  .world-banner-title { font-size: 34px; max-width: 17ch; }
  .world-banner-copy { padding: 8px 18px 20px; }
  .world-banner-note { font-size: 13px; max-width: 32ch; }
}

@media (max-aspect-ratio: 1/1) {
  .world-backdrop::after { background: linear-gradient(180deg, rgb(248 247 239 / 18%), transparent 52%); }
}

@media (max-height: 600px) and (orientation: landscape) {
  /* Short screens place the copy over trees; soften only its immediate backdrop. */
  .world-banner-copy::before {
    content: "";
    position: absolute;
    z-index: -1;
    inset: -12px auto -12px -8px;
    width: min(540px, 100%);
    pointer-events: none;
    background: linear-gradient(90deg, rgb(248 247 239 / 94%) 65%, rgb(248 247 239 / 70%) 80%, transparent);
    mask-image: linear-gradient(180deg, transparent, #000 12%, #000 92%, transparent);
  }
}

@media (max-width: 600px) {
  .wrap { width: calc(100% - 24px); }
  .nav { font-size: 22px; gap: 4px; }
  .nav a { gap: 5px; padding-inline: 4px; }
  .nav img { width: 16px; height: 16px; }
  .world-banner-copy { padding-left: 18px; }
  .world-banner-title { font-size: 31px; }
  .world-banner-note { max-width: 29ch; margin-top: 6px; }
  .layout { padding: 12px; margin-bottom: 24px; }
  .panel { border: 0; padding: 6px; background: transparent; }
  .panel .tool-title { font-size: 34px; text-wrap: auto; }
  .panel .kicker { margin-top: 8px; }
  .planner-group { margin-top: 16px; }
  .planner-materials { margin-top: 20px; }
  .faq.wrap { padding: 20px 16px; }
  .prose-page { padding: 24px 18px; }
  .site-footer { padding-inline: 4px; }
  .has-world .site-footer { padding-inline: 16px; }
  .hero { padding-top: 28px; gap: 20px; }
}

@media (min-width: 861px) and (max-width: 1120px) {
  .layout { grid-template-columns: 250px minmax(0, 1fr); padding: 16px; gap: 18px; }
  .panel { padding: 14px; }
  .circle-stats .stat { padding: 10px; }
}

@media (min-width: 541px) and (max-width: 1120px) {
  .blueprint-tools { grid-template-columns: minmax(0, 1fr) minmax(220px, 1fr); }
  .blueprint-guides { grid-column: 1; grid-row: 2; }
  .blueprint-view { grid-column: 2; grid-row: 2; justify-self: end; }
}

/* Focus on one blueprint and its current row while building beside the game. */
.circle-build-mode {
  --build-actions-height: 92px;
}
.circle-build-mode > .wrap { width: min(960px, calc(100% - 32px)); }
.circle-build-mode .site-header,
.circle-build-mode .world-banner,
.circle-build-mode .circle-controls,
.circle-build-mode .faq,
.circle-build-mode .site-footer,
.circle-build-mode .stats,
.circle-build-mode .export-bar,
.circle-build-mode .tool-feedback,
.circle-build-mode .rows,
.circle-build-mode label[for="ascii"],
.circle-build-mode #ascii,
.circle-build-mode .blueprint-style,
.circle-build-mode .blueprint-thickness,
.circle-build-mode #thickness-adjustment,
.circle-build-mode #thickness-help,
.circle-build-mode #center-note { display: none; }
.circle-build-mode .layout { display: block; margin: 16px 0; padding: 20px; }
.circle-build-mode .blueprint-tools { grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 8px; padding: 0 0 12px; }
.circle-build-mode .blueprint-guides { grid-column: 1; grid-row: 1; }
.circle-build-mode .blueprint-view { grid-column: 2; grid-row: 1; justify-self: end; align-self: center; }
.circle-build-mode .build-bar { padding: 16px; }
.circle-build-mode #build-title { font-size: clamp(20px, 3vw, 26px); line-height: 1.35; }
.circle-build-mode #build-runs { font-size: 17px; line-height: 1.55; }
.circle-build-mode .row-segments { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); }
.circle-build-mode .row-segments[hidden] { display: none; }
.circle-build-mode .row-segments strong { font-size: 20px; }
.circle-build-mode .row-segments span { font-size: 15px; }
.circle-build-mode .build-actions { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr) minmax(0, 1fr); }
.circle-build-mode .build-actions .btn { min-height: 52px; font-weight: 600; touch-action: manipulation; }
.circle-build-mode .progress-actions { margin-top: 8px; }
.circle-build-mode .progress-actions .btn { font-size: 14px; }
.circle-build-mode #progress-note { margin-bottom: 0; font-size: 13px; }
.circle-build-mode #progress-status { font-size: 14px; }

@media (max-width: 600px) {
  .circle-build-mode > .wrap { width: calc(100% - 16px); padding-bottom: calc(var(--build-actions-height) + env(safe-area-inset-bottom)); }
  .circle-build-mode .layout { margin: 8px 0; padding: 12px 8px; }
  .circle-build-mode .build-mode-heading { gap: 8px; }
  .circle-build-mode .build-mode-heading h2 { font-size: 30px; }
  .circle-build-mode .build-mode-heading p { font-size: 13px; }
  .circle-build-mode .build-mode-heading .btn { font-size: 14px; }
  .circle-build-mode .blueprint-tools { padding-bottom: 8px; }
  .circle-build-mode .blueprint-guides label { font-size: 14px; }
  .circle-build-mode .blueprint-notes { padding: 8px; }
  .circle-build-mode .build-bar { padding: 12px; }
  .circle-build-mode .row-segments li { padding: 10px; }
  .circle-build-mode .build-actions {
    position: fixed;
    z-index: 10;
    inset: auto 0 0;
    gap: 6px;
    padding: 12px max(12px, env(safe-area-inset-right)) calc(12px + env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));
    border-top: 1px solid var(--line);
    background: var(--paper);
    box-shadow: 0 -4px 16px rgb(34 64 36 / 8%);
  }
  .circle-build-mode .build-actions .btn { margin: 0; min-height: 56px; padding-inline: 6px; font-size: 14px; line-height: 1.35; }
}

@media (max-width: 360px) {
  .circle-build-mode .blueprint-tools { grid-template-columns: minmax(0, 1fr); }
  .circle-build-mode .blueprint-guides { grid-row: 2; }
  .circle-build-mode .blueprint-view { grid-column: 1; grid-row: 1; justify-self: start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; scroll-behavior: auto !important; }
}

@supports not (width: 1cqw) {
  .world-banner { width: 100%; margin-left: 0; }
  .site-header::before { inset: 0; }
}