/* Cad Bot — machined, not SaaS. Tokens from the site plan §4.
   Fonts: self-hosted woff2 (Familjen Grotesk / Fraunces / IBM Plex Mono) to be
   added under /fonts before launch; stacks below degrade to system faces. */

:root {
  --stock: #e6e3db;      /* page background, cold aluminum */
  --graphite: #1a1e1c;   /* primary text */
  --cyanotype: #2c6574;  /* links, secondary emphasis */
  --oil: #c47a2c;        /* the only warm color: primary action */
  --hairline: #b7b3a7;   /* 1px drawing lines */
  --paper: #f4f2ec;      /* card / title block fill */
  --hazard: #8c2f1b;     /* errors */
  --radius: 2px;
  --grid: 8px;
  --font-ui: "Familjen Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--stock);
  color: var(--graphite);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.55;
}

a { color: var(--cyanotype); text-underline-offset: 2px; }
a:hover { color: var(--graphite); }

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

/* ---- top bar ---- */
.topbar {
  display: flex;
  align-items: baseline;
  gap: calc(var(--grid) * 4);
  padding: calc(var(--grid) * 2) calc(var(--grid) * 3);
  border-bottom: 1px solid var(--hairline);
  flex-wrap: wrap;
}
.wordmark {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--graphite);
}
.topbar nav { display: flex; gap: calc(var(--grid) * 3); font-size: 14px; flex-wrap: wrap; }
.topbar nav a { text-decoration: none; }
.nav-soon { color: var(--hairline); cursor: default; font-size: 14px; }
.auth-slot {
  margin-left: auto;
  display: flex;
  align-items: baseline;
  gap: calc(var(--grid) * 1.5);
  font-size: 13px;
}
.auth-slot a { text-decoration: none; }
.auth-btn, .inline-link {
  font: inherit;
  font-size: 13px;
  background: transparent;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 2px 8px;
  cursor: pointer;
  color: var(--graphite);
}
.auth-btn:hover, .inline-link:hover { border-color: var(--graphite); }
.auth-btn-primary { background: var(--oil); color: var(--paper); border-color: var(--oil); }
.auth-btn-primary:hover { filter: brightness(1.05); border-color: var(--oil); }
.auth-account { font-size: 13px; }
#clerk-user-button { display: flex; align-items: center; }
.inline-link { color: var(--cyanotype); border-color: var(--cyanotype); }

main { max-width: 1200px; margin: 0 auto; padding: 0 calc(var(--grid) * 3); }

/* ---- hero ---- */
.hero { padding: calc(var(--grid) * 6) 0 calc(var(--grid) * 3); max-width: 820px; }
h1 {
  font-family: var(--font-display);
  font-weight: 560;
  font-size: clamp(34px, 5vw, 60px);
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin: 0 0 calc(var(--grid) * 2);
}
.lede { font-size: 18px; max-width: 62ch; margin: 0; }

/* ---- tool: title block + viewport ---- */
.tool {
  display: grid;
  grid-template-columns: 42fr 58fr;
  border: 1px solid var(--hairline);
  background: var(--paper);
  margin: calc(var(--grid) * 4) 0;
  min-height: 460px;
}
.titleblock { border-right: 1px solid var(--hairline); display: flex; flex-direction: column; }

.tb-row { display: flex; border-bottom: 1px solid var(--hairline); }
.tb-main { flex: 0 0 auto; }
.tb-cell { padding: calc(var(--grid) * 1.5); border-right: 1px solid var(--hairline); }
.tb-cell:last-child { border-right: 0; }
.tb-title { flex: 1; display: flex; flex-direction: column; gap: var(--grid); }
.tb-side { display: flex; flex-direction: column; min-width: 132px; }
.tb-side .tb-cell { border-right: 0; border-bottom: 1px solid var(--hairline); display: flex; flex-direction: column; }
.tb-side .tb-cell:last-child { border-bottom: 0; }

.tb-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--cyanotype);
  text-transform: uppercase;
}
.tb-value { font-size: 13px; }
.mono { font-family: var(--font-mono); }

#prompt {
  border: 0;
  background: transparent;
  resize: vertical;
  font: 500 17px/1.5 var(--font-ui);
  color: var(--graphite);
  min-height: 88px;
}
#prompt:focus { outline: none; }
#prompt::placeholder { color: color-mix(in srgb, var(--graphite) 42%, var(--stock)); }

.tb-actions { align-items: stretch; }
.tb-brand { flex: 1; display: flex; flex-direction: column; gap: 2px; font-size: 12px; }
.tb-btns { display: flex; align-items: stretch; }

.clear-btn {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  border: 0;
  border-left: 1px solid var(--hairline);
  border-radius: 0;
  background: var(--paper);
  color: var(--graphite);
  padding: calc(var(--grid) * 2) calc(var(--grid) * 3);
  cursor: pointer;
}
.clear-btn:hover { background: var(--stock); }

.build-btn {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.1em;
  border: 0;
  border-left: 1px solid var(--hairline);
  border-radius: 0;
  background: var(--oil);
  color: var(--paper);
  padding: calc(var(--grid) * 2) calc(var(--grid) * 4);
  cursor: pointer;
}
.build-btn:hover { filter: brightness(0.94); }
.build-btn[disabled] { cursor: progress; animation: oilpulse 1.2s ease-in-out infinite; }
@keyframes oilpulse { 50% { filter: brightness(1.15); } }

.tb-status {
  margin: 0;
  padding: calc(var(--grid) * 1.5);
  font-size: 13px;
  color: color-mix(in srgb, var(--graphite) 75%, var(--stock));
  border-bottom: 1px solid var(--hairline);
}
.tb-status.error { color: var(--hazard); }

.iterate {
  padding: calc(var(--grid) * 1.5);
  border-bottom: 1px solid var(--hairline);
  display: grid;
  gap: var(--grid);
}
.iterate[hidden] { display: none !important; }
#iterate-prompt {
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--paper);
  resize: vertical;
  font: 500 14px/1.45 var(--font-ui);
  color: var(--graphite);
  min-height: 56px;
  padding: 8px;
}
#iterate-prompt:focus { outline: 1px solid var(--cyanotype); }
.revise-btn {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  border: 1px solid var(--hairline);
  border-radius: 0;
  background: var(--paper);
  color: var(--graphite);
  padding: 8px 14px;
  cursor: pointer;
}
.revise-btn:hover { background: var(--stock); }
.revise-btn[disabled] { cursor: progress; opacity: 0.6; }

.params { padding: calc(var(--grid) * 1.5); overflow-y: auto; }
.param-row {
  display: grid;
  grid-template-columns: 1fr 96px;
  gap: var(--grid);
  align-items: center;
  padding: calc(var(--grid) * 0.75) 0;
  border-bottom: 1px dashed color-mix(in srgb, var(--hairline) 60%, transparent);
}
.param-row label { font-size: 12px; }
.param-row input[type="range"] { width: 100%; accent-color: var(--cyanotype); }
.param-row .param-val {
  font-family: var(--font-mono);
  font-size: 12px;
  text-align: right;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--paper);
  padding: 2px 4px;
  width: 88px;
}

/* ---- viewport ---- */
.viewport {
  position: relative;
  display: flex;
  flex-direction: column;
  align-self: start;
  width: 100%;
  min-width: 0;
  min-height: 0;
  background: var(--stock);
}
.viewport-frame {
  flex: 0 0 auto;
  width: 100%;
  min-width: 0;
  position: relative;
  background: var(--stock);
}
.viewport-stage {
  position: relative;
  width: 100%;
  height: auto;
  aspect-ratio: 297 / 210; /* ISO 5457 A4 landscape — matches the shop sheet */
  overflow: hidden;
  background: #efece3;
  border-top: 0;
}
.viewport-empty {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: calc(var(--grid) * 2);
  color: var(--cyanotype);
  font-size: 14px;
  padding: calc(var(--grid) * 2);
  text-align: center;
}
.ghost-views {
  width: 78%;
  height: auto;
  max-height: 70%;
}
.view-toggle {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 0;
  flex-shrink: 0;
  border-bottom: 1px solid var(--hairline);
  background: var(--paper);
}
.view-btn {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  background: transparent;
  border: 0;
  border-right: 1px solid var(--hairline);
  padding: calc(var(--grid) * 0.85) calc(var(--grid) * 1.5);
  color: color-mix(in srgb, var(--graphite) 55%, var(--stock));
  cursor: pointer;
}
.view-btn.is-on { color: var(--cyanotype); background: var(--stock); }
.drawing-zoom {
  margin-left: auto;
  display: flex;
  align-items: stretch;
  border-left: 1px solid var(--hairline);
}
.drawing-zoom .view-btn:last-child { border-right: 0; }
.drawing-zoom .view-btn { letter-spacing: 0.06em; }
.drawing-zoom-label {
  min-width: 4.5em;
  font-variant-numeric: tabular-nums;
}
.drawing-preview {
  position: absolute;
  inset: 0;
  min-height: 0;
  overflow: hidden;
  background: #ffffff;
}
.drawing-stage {
  position: absolute;
  inset: 0;
  overflow: hidden;
  cursor: grab;
  touch-action: none;
  outline: none;
  user-select: none;
  -webkit-user-select: none;
  overscroll-behavior: contain;
}
.drawing-stage.is-panning { cursor: grabbing; }
.drawing-stage:focus-visible { box-shadow: inset 0 0 0 2px var(--cyanotype); }
.drawing-sheet {
  transform-origin: 0 0;
  width: max-content;
  height: max-content;
}
.drawing-sheet svg {
  display: block;
  max-width: none;
}
.drawing-hint {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 8px;
  margin: 0;
  pointer-events: none;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--cyanotype) 70%, var(--stock));
}
#preview {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  min-height: 0;
  display: block;
  touch-action: none;
}

.downloadbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--grid);
  flex-wrap: wrap;
  flex-shrink: 0;
  border-top: 1px solid var(--hairline);
  padding: calc(var(--grid) * 1.5);
  background: var(--paper);
  font-size: 13px;
}
.report { font-family: var(--font-mono); font-size: 12px; }
.report .ok { color: var(--cyanotype); }
.report .bad { color: var(--hazard); }
.downloads { display: flex; gap: calc(var(--grid) * 2); }
.downloads a {
  font-family: var(--font-mono);
  font-size: 13px;
  text-decoration: none;
  border: 1px solid var(--cyanotype);
  border-radius: var(--radius);
  padding: calc(var(--grid) * 0.75) calc(var(--grid) * 1.5);
}
.downloads a:hover { background: var(--cyanotype); color: var(--paper); }

/* ---- prose / faq / footer ---- */
.prose { max-width: 66ch; padding: calc(var(--grid) * 3) 0; }
.prose-narrow { padding-top: calc(var(--grid) * 6); }
.prose h2, .faq h2 {
  font-family: var(--font-display);
  font-weight: 560;
  letter-spacing: -0.02em;
  font-size: 26px;
  margin: calc(var(--grid) * 4) 0 var(--grid);
}
.faq { max-width: 66ch; padding-bottom: calc(var(--grid) * 4); }
.faq dl { margin: 0; }
.faq-item { border-top: 1px solid var(--hairline); padding: calc(var(--grid) * 2) 0; }
.faq dt { font-weight: 600; margin-bottom: calc(var(--grid) * 0.5); }
.faq dd { margin: 0; }

.footer { border-top: 1px solid var(--hairline); margin-top: calc(var(--grid) * 6); }
.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: calc(var(--grid) * 3);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: calc(var(--grid) * 3);
  font-size: 13px;
}
.footer-grid a { display: block; text-decoration: none; margin-top: calc(var(--grid) * 0.5); }
.footer-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--cyanotype);
  display: block;
}
.footer-note p { margin: calc(var(--grid) * 0.5) 0 0; color: color-mix(in srgb, var(--graphite) 70%, var(--stock)); }

.plans {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: calc(var(--grid) * 2);
  margin: calc(var(--grid) * 4) 0;
}
.plan {
  border: 1px solid var(--hairline);
  background: var(--paper);
  padding: calc(var(--grid) * 2);
}
.plan h2 {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.08em;
  margin: 0 0 var(--grid);
}
.plan-price { font-size: 15px; margin: 0 0 calc(var(--grid) * 2); min-height: 2.8em; }
.plan ul { margin: 0 0 calc(var(--grid) * 2); padding-left: 1.1em; }
.plan li { margin: calc(var(--grid) * 0.5) 0; }
.plan-cta {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  text-decoration: none;
  color: var(--paper);
  background: var(--oil);
  border: 1px solid var(--oil);
  border-radius: var(--radius);
  padding: calc(var(--grid) * 0.75) calc(var(--grid) * 1.5);
  cursor: pointer;
}
.plan-cta:hover { filter: brightness(1.05); }
.plan-wait { font-size: 13px; color: color-mix(in srgb, var(--graphite) 70%, var(--stock)); margin: 0; }
.tb-status a, .tb-status button { font: inherit; }

/* ---- parts catalog ---- */
.catalog-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--hairline);
  background: var(--paper);
  margin: 0 0 calc(var(--grid) * 3);
}
.catalog-stats > div {
  padding: calc(var(--grid) * 2);
  border-right: 1px solid var(--hairline);
}
.catalog-stats > div:last-child { border-right: 0; }
.catalog-stat-n {
  display: block;
  font-size: 22px;
  letter-spacing: 0.04em;
}
.catalog-stat-l {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyanotype);
}

.catalog-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--grid) calc(var(--grid) * 2);
  border: 1px solid var(--hairline);
  background: var(--paper);
  padding: calc(var(--grid) * 1.5) calc(var(--grid) * 2);
  margin: 0 0 calc(var(--grid) * 2);
}
.catalog-toolbar #catalog-q {
  flex: 1 1 240px;
  border: 0;
  background: transparent;
  font: 500 16px/1.5 var(--font-ui);
  color: var(--graphite);
  min-width: 0;
}
.catalog-toolbar #catalog-q:focus { outline: none; }
.catalog-toolbar #catalog-q::placeholder {
  color: color-mix(in srgb, var(--graphite) 42%, var(--stock));
}
.catalog-count {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: color-mix(in srgb, var(--graphite) 70%, var(--stock));
  min-height: 1.2em;
}

.catalog-jump {
  display: flex;
  flex-wrap: wrap;
  gap: calc(var(--grid) * 0.5) calc(var(--grid) * 2);
  margin: 0 0 calc(var(--grid) * 4);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}
.catalog-jump a { text-decoration: none; }

.catalog-group { margin: 0 0 calc(var(--grid) * 5); }
.catalog-group h2 {
  font-family: var(--font-display);
  font-weight: 560;
  font-size: 26px;
  letter-spacing: -0.02em;
  margin: 0 0 var(--grid);
}
.catalog-blurb {
  max-width: 66ch;
  margin: 0 0 calc(var(--grid) * 2);
  color: color-mix(in srgb, var(--graphite) 78%, var(--stock));
}
.catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: calc(var(--grid) * 2);
}

.part-card {
  border: 1px solid var(--hairline);
  background: var(--paper);
  padding: calc(var(--grid) * 2);
  display: flex;
  flex-direction: column;
  gap: calc(var(--grid) * 0.75);
}
.part-card-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--grid);
}
.part-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 0;
  text-transform: capitalize;
}
.part-family {
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--cyanotype);
  white-space: nowrap;
}
.part-names {
  margin: 0;
  font-size: 13px;
  color: color-mix(in srgb, var(--graphite) 78%, var(--stock));
}
.part-names-zh { letter-spacing: 0.04em; }
.part-ref {
  margin: 0;
  font-size: 12px;
  color: color-mix(in srgb, var(--graphite) 62%, var(--stock));
}
.part-try { margin: 0; font-size: 13px; }
.part-try a { text-decoration: none; }
.part-card-oos { background: color-mix(in srgb, var(--stock) 55%, var(--paper)); }
.catalog-oos h2 { color: var(--hazard); }

@media (max-width: 860px) {
  .plans { grid-template-columns: 1fr; }
  .tool { grid-template-columns: 1fr; }
  .titleblock { border-right: 0; border-top: 1px solid var(--hairline); order: 2; }
  .viewport { order: 1; }
  .build-btn { position: sticky; bottom: env(safe-area-inset-bottom, 0); }
  .footer-grid { grid-template-columns: 1fr; }
  .drawing-zoom { border-left: 0; }
  .catalog-stats { grid-template-columns: 1fr 1fr; }
  .catalog-stats > div:nth-child(odd) { border-bottom: 1px solid var(--hairline); }
  .catalog-stats > div:nth-child(2) { border-right: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .build-btn[disabled] { animation: none; }
  html { scroll-behavior: auto; }
}