:root {
  --ground: #eaeeec;
  --panel: #f7f9f8;
  --ink: #16201d;
  --muted: #56635e;
  --line: #c9d2ce;
  --accent: #99680f;
  --accent-ink: #ffffff;
  --sun: #c8912e;
  --planet: #3f7383;
  --ring: #3a4441;
  --carrier: #8a9892;
  --ring2: #7a5a8c;
  --ok: #2f7a4a;
  --warn: #a26a00;
  --err: #b3362b;
  --info: #3d6b8f;
  --field: #ffffff;
  --display: "Barlow Condensed", "Arial Narrow", "Roboto Condensed", sans-serif;
  --body: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --ground: #0f1513;
    --panel: #151d1a;
    --ink: #e2e8e5;
    --muted: #93a19b;
    --line: #2a3632;
    --accent: #e2a940;
    --accent-ink: #1a1305;
    --sun: #e2a940;
    --planet: #6fa8b8;
    --ring: #a9b6b1;
    --carrier: #5f6e68;
    --ring2: #b294c4;
    --ok: #5cbf7e;
    --warn: #e0a53a;
    --err: #f0766a;
    --info: #7fb0d6;
    --field: #0f1513;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --ground: #0f1513;
  --panel: #151d1a;
  --ink: #e2e8e5;
  --muted: #93a19b;
  --line: #2a3632;
  --accent: #e2a940;
  --accent-ink: #1a1305;
  --sun: #e2a940;
  --planet: #6fa8b8;
  --ring: #a9b6b1;
  --carrier: #5f6e68;
  --ring2: #b294c4;
  --ok: #5cbf7e;
  --warn: #e0a53a;
  --err: #f0766a;
  --info: #7fb0d6;
  --field: #0f1513;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font: 14px/1.5 var(--body);
}
.wrap { max-width: 1320px; margin: 0 auto; padding-inline: 16px; padding-block: 20px 32px; }

.top { display: flex; flex-wrap: wrap; gap: 12px 32px; align-items: end; justify-content: space-between; padding-bottom: 16px; border-bottom: 2px solid var(--ink); margin-bottom: 16px; }
h1 .logo { display: inline-block; width: 1.3em; height: 1.3em; vertical-align: -0.28em; margin-right: 0.3em; flex: none; }
h1 .logo svg { display: block; width: 100%; height: 100%; }
h1 { font: 700 34px/1 var(--display); letter-spacing: 0.01em; text-transform: uppercase; margin: 0; text-wrap: balance; }
.sub { margin: 6px 0 0; color: var(--muted); max-width: 62ch; }
.top-right { display: flex; flex-direction: column; align-items: flex-end; gap: 10px; }
@media (max-width: 760px) { .top-right { align-items: flex-start; } }
.lang-menu { position: relative; }
.lang-menu > summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font: 500 14px/1 var(--body);
  color: var(--ink);
  padding: 6px 10px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: var(--panel);
}
.lang-menu > summary::-webkit-details-marker { display: none; }
.lang-menu > summary::after { content: ""; width: 6px; height: 6px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: translateY(-2px) rotate(45deg); }
.lang-menu[open] > summary::after { transform: translateY(1px) rotate(-135deg); }
.lang-menu ul {
  position: absolute;
  right: 0;
  z-index: 20;
  margin: 6px 0 0;
  padding: 6px;
  list-style: none;
  min-width: 150px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
  box-shadow: 0 8px 24px rgb(0 0 0 / 0.14);
}
@media (max-width: 760px) { .lang-menu ul { right: auto; left: 0; } }
.lang-menu a { display: block; padding: 7px 10px; border-radius: 3px; color: var(--ink); text-decoration: none; }
.lang-menu a:hover, .lang-menu a:focus-visible { background: var(--ground); }
.lang-menu a[aria-current="page"] { color: var(--accent); font-weight: 600; }
.headline { display: flex; gap: 20px; font-family: var(--mono); font-variant-numeric: tabular-nums; }
.headline div { display: grid; }
.headline b { font: 600 26px/1 var(--display); color: var(--accent); }
.headline span { font: 500 11px/1.4 var(--display); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 300px minmax(0, 1fr) 320px;
  grid-template-areas:
    "params stage checks"
    "params data checks"
    "params export checks";
  align-items: start;
}
.params { grid-area: params; }
.stage { grid-area: stage; }
.data { grid-area: data; display: grid; gap: 18px; }
.data > div { min-width: 0; }
.checks { grid-area: checks; }
.export { grid-area: export; }
@media (max-width: 1100px) {
  .grid { grid-template-columns: 300px minmax(0, 1fr); grid-template-areas: "params stage" "params data" "params checks" "params export"; }
}
@media (max-width: 760px) {
  .grid { grid-template-columns: minmax(0, 1fr); grid-template-areas: "stage" "params" "data" "checks" "export"; }
}

.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 4px; padding: 14px 16px; min-width: 0; }
h2 { font: 600 15px/1.2 var(--display); letter-spacing: 0.1em; text-transform: uppercase; margin: 0 0 10px; }
h2:not(:first-child) { margin-top: 18px; }

fieldset { border: 0; padding: 0; margin: 0 0 16px; display: grid; gap: 8px; }
legend { font: 600 15px/1.2 var(--display); letter-spacing: 0.1em; text-transform: uppercase; padding: 0 0 8px; border-bottom: 1px solid var(--line); width: 100%; margin-bottom: 4px; }
.row { display: grid; grid-template-columns: 1fr 104px; gap: 8px; align-items: center; }
.row label { color: var(--ink); }
.unit { color: var(--muted); font-size: 12px; }
select {
  width: 100%;
  font: 500 14px/1 var(--body);
  color: var(--ink);
  background: var(--field);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 6px 6px;
}
input[type="number"], input[type="text"] {
  width: 100%;
  font: 500 14px/1 var(--mono);
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  background: var(--field);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 7px 8px;
  text-align: right;
}
input:focus-visible, select:focus-visible, button:focus-visible, summary:focus-visible, .seg input:focus-visible + * { outline: 2px solid var(--accent); outline-offset: 1px; }
input:invalid { border-color: var(--err); }
.ro { font: 500 14px/1 var(--mono); text-align: right; padding: 7px 9px; color: var(--accent); }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; }
.hint { margin: -2px 0 2px; color: var(--muted); font-size: 12px; }
details > summary { cursor: pointer; color: var(--muted); font-weight: 500; padding: 4px 0; }
details[open] > summary { margin-bottom: 6px; }
details > .row + .row { margin-top: 8px; }
.finder-body { display: grid; gap: 8px; }
.row.bore { grid-template-columns: 1fr 176px; }
.row.bore .pair { grid-template-columns: 72px 1fr; }

.btn {
  font: 600 14px/1 var(--display);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--accent);
  color: var(--accent-ink);
  border: 1px solid var(--accent);
  border-radius: 3px;
  padding: 9px 12px;
  cursor: pointer;
}
.btn:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--muted); border-color: var(--line); width: 100%; }
.btn.small { padding: 6px 10px; }
.btn.line { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.line:hover { border-color: var(--accent); color: var(--accent); filter: none; }

.combos { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; max-height: 240px; overflow: auto; }
.combos button {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  font: 400 13px/1.3 var(--mono);
  font-variant-numeric: tabular-nums;
  background: var(--field);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 6px 8px;
  text-align: left;
  cursor: pointer;
}
.combos button:hover { border-color: var(--accent); }
.combos .err { color: var(--muted); font-size: 12px; }

.stage { display: grid; gap: 10px; }
.stage-bar { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; justify-content: space-between; }
.seg { display: inline-flex; align-items: center; border: 1px solid var(--line); border-radius: 3px; overflow: hidden; }
.seg-label { font: 600 12px/1 var(--display); letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); padding: 0 10px; }
.seg label { position: relative; cursor: pointer; }
.seg input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.seg label { padding: 6px 10px; border-left: 1px solid var(--line); font-weight: 500; }
.seg label:has(input:checked) { background: var(--ink); color: var(--panel); }
.seg label:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: -2px; }
.stage-actions { display: flex; gap: 12px; align-items: center; }
.check { display: inline-flex; gap: 6px; align-items: center; color: var(--muted); cursor: pointer; }

.view {
  position: relative;
  aspect-ratio: 1;
  max-width: 100%;
  max-height: 78vh;
  margin: 0 auto;
  width: 100%;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 24px 24px;
  background-position: center;
  border-radius: 3px;
}
.view::before { content: ""; position: absolute; inset: 0; background: var(--panel); opacity: 0.72; border-radius: 3px; }
#preview, #view3d { position: relative; width: 100%; height: 100%; display: block; touch-action: none; }
#view3d { cursor: grab; }
#view3d:active { cursor: grabbing; }
.view-note { position: absolute; left: 10px; bottom: 6px; right: 10px; margin: 0; font-size: 12px; color: var(--muted); pointer-events: none; }
.scale { position: absolute; left: 10px; bottom: 8px; display: grid; gap: 2px; font: 500 11px/1 var(--mono); color: var(--muted); }
.scale i { display: block; height: 6px; border: 1.5px solid var(--muted); border-top: 0; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 16px; color: var(--muted); font-size: 13px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 12px; height: 12px; border-radius: 2px; display: inline-block; }

.table-wrap { overflow-x: auto; }
.dims { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
.dims th, .dims td { padding: 5px 4px; border-bottom: 1px solid var(--line); text-align: right; white-space: nowrap; }
.dims th { font: 600 12px/1.2 var(--display); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.dims th:first-child, .dims td:first-child { text-align: left; }
.dims td { font: 400 13px/1.3 var(--mono); }
.dims td:first-child { font-family: var(--body); }
.dims td[colspan] { white-space: normal; }
.ratios { display: grid; gap: 6px; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); }
.ratio { display: grid; grid-template-columns: 1fr auto; gap: 2px 10px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 3px; }
.ratio b { font: 600 22px/1 var(--display); font-variant-numeric: tabular-nums; }
.ratio span { color: var(--muted); font-size: 12px; grid-column: 1 / -1; }
.ratio.active { border-color: var(--accent); }
.ratio.active b { color: var(--accent); }

.check-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.check-list li { display: grid; grid-template-columns: auto 1fr; gap: 2px 10px; align-items: baseline; }
.pill { font: 600 11px/1 var(--display); letter-spacing: 0.1em; text-transform: uppercase; padding: 4px 6px; border-radius: 2px; border: 1px solid currentColor; min-width: 44px; text-align: center; }
.pill.ok { color: var(--ok); }
.pill.warn { color: var(--warn); }
.pill.error { color: var(--err); background: color-mix(in srgb, var(--err) 12%, transparent); }
.pill.info { color: var(--info); }
.check-list b { font-weight: 600; }
.check-list p { margin: 0; color: var(--muted); grid-column: 2; font-size: 13px; }

.bundle { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; justify-content: space-between; padding: 12px; border: 1px solid var(--accent); border-radius: 3px; margin-bottom: 10px; }
.bundle b { font: 600 16px/1.1 var(--display); letter-spacing: 0.05em; text-transform: uppercase; display: block; }
.bundle span { color: var(--muted); font-size: 13px; }
.bundle .btns { display: flex; gap: 8px; flex-wrap: wrap; }
code { font: 12.5px var(--mono); }
.exports { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 8px; }
.part { border: 1px solid var(--line); border-radius: 3px; padding: 10px; display: grid; grid-template-columns: 56px 1fr; gap: 4px 10px; align-items: center; }
.part svg { grid-row: span 2; width: 56px; height: 56px; }
.part b { font: 600 15px/1.1 var(--display); letter-spacing: 0.05em; text-transform: uppercase; }
.part .btns { display: flex; gap: 6px; }
.part .size { grid-column: 1 / -1; font: 400 12px/1.2 var(--mono); color: var(--muted); }
.status { min-height: 1.5em; margin: 10px 0 0; color: var(--muted); }
.howto ol { margin: 6px 0 0; padding-left: 20px; display: grid; gap: 4px; max-width: 90ch; color: var(--muted); }
.howto b { color: var(--ink); }
.foot { margin-top: 20px; color: var(--muted); font-size: 12px; }

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto; } }