/* lingbuilds — blueprint sheet. Mobile first, flat linework only. */

@font-face {
  font-family: "Space Mono";
  src: url("fonts/space-mono-400.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "Space Mono";
  src: url("fonts/space-mono-700.woff2") format("woff2");
  font-weight: 700;
  font-display: swap;
}

:root {
  --blue: #12395B;
  --panel: #0E2F4C;
  --ink: #D6E4F0;
  --ink-dim: rgba(214, 228, 240, 0.78);
  --line: rgba(214, 228, 240, 0.5);
  --line-faint: rgba(214, 228, 240, 0.22);
  --grid-minor: rgba(214, 228, 240, 0.045);
  --grid-major: rgba(214, 228, 240, 0.09);
  --amber: #E9A83F;
  --mono: "Space Mono", "IBM Plex Mono", ui-monospace, monospace;
  --sans: system-ui, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  background-color: var(--blue);
  /* coarse grid only on small screens; minor 8px grid added at >=720px */
  background-image:
    repeating-linear-gradient(0deg,  var(--grid-major) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(90deg, var(--grid-major) 0 1px, transparent 1px 40px);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.65;
}

/* ---------- accessibility helpers ---------- */

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

.skip-link {
  position: absolute;
  left: 1rem; top: -3rem;
  z-index: 10;
  padding: 0.4rem 0.8rem;
  background: var(--blue);
  border: 1px solid var(--ink);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-decoration: none;
}
.skip-link:focus { top: 0.5rem; }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

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

/* ---------- sheet frame + zones ---------- */

.sheet {
  position: relative;
  margin: 10px;
  border: 1.5px solid var(--ink);
  outline: 1px solid var(--line-faint);
  outline-offset: 3px;
  min-height: calc(100vh - 20px);
}

.zones { display: none; }

.content {
  max-width: 920px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2rem;
}

/* ---------- type ---------- */

h1, h2, h3, .fig-line, .parts-list, .rev-table, .title-block,
.car-counter, .dwg-no, .descriptor, .signup-label, .signup-btn,
.signup-fine, .signup-confirm, .ws-note, .colophon, .callout {
  font-family: var(--mono);
}

.sect-head h2 {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}
.sect-tag { color: var(--ink-dim); font-weight: 400; }

p { max-width: 58ch; }

a { color: var(--ink); text-decoration-color: var(--line); text-underline-offset: 3px; }
a:hover { color: var(--amber); text-decoration-color: var(--amber); }

/* ---------- masthead ---------- */

.masthead {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 2rem;
}

.dwg-no {
  font-size: 0.65rem;
  letter-spacing: 0.25em;
  color: var(--ink-dim);
}

.wordmark {
  font-size: clamp(2.4rem, 9vw, 4rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.1;
}

.descriptor {
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--ink-dim);
  max-width: none;
}

.title-block {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--ink);
}
.tb-cell {
  padding: 0.4rem 0.6rem 0.5rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.tb-cell:nth-child(3n) { border-right: 0; }
.tb-cell:nth-child(n+4) { border-bottom: 0; }
.tb-cell dt {
  font-size: 0.58rem;
  letter-spacing: 0.2em;
  color: var(--ink-dim);
}
.tb-cell dd { font-size: 0.85rem; font-weight: 700; }
.tb-hatch {
  background-image: repeating-linear-gradient(45deg,
    transparent 0 5px, var(--line-faint) 5px 6px);
}

/* ---------- section headers: callout bubble + leader ---------- */

.sect { margin-bottom: 3rem; }

.sect-head {
  display: flex;
  align-items: center;
  gap: 0;
  margin-bottom: 1.25rem;
}

.callout {
  flex: none;
  width: 32px; height: 32px;
  border: 1.5px solid var(--ink);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-weight: 700;
}

.leader {
  flex: none;
  width: 18px;
  height: 1px;
  background: var(--line);
  position: relative;
  margin-right: 10px;
}
.leader::after {
  content: "";
  position: absolute;
  right: -1px; top: -3.5px;
  border: solid transparent;
  border-width: 3.5px 0 3.5px 8px;
  border-left-color: var(--line);
}

/* ---------- intro ---------- */

.intro-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.intro-copy p + p { margin-top: 1em; }

.fig-frame { position: relative; max-width: 340px; }

.portrait-fig img,
.car-slide img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
}

.fig-line {
  margin-top: 0.5rem;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  line-height: 1.7;
  color: var(--ink-dim);
}
.fig-no { color: var(--ink); font-weight: 700; margin-right: 0.35em; }

/* ---------- dimension lines ---------- */

.dim { position: relative; color: var(--line); }

.dim-lbl {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  background: var(--blue);
  padding: 0 8px;
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: var(--ink-dim);
  white-space: nowrap;
}

/* horizontal, arrow terminators */
.dim-h {
  height: 1px;
  background: var(--line);
  margin: 14px 0;
}
.dim-h::before, .dim-h::after {
  content: "";
  position: absolute;
  top: -3.5px;
  border: solid transparent;
}
.dim-h::before { left: 0;  border-width: 3.5px 8px 3.5px 0; border-right-color: var(--line); }
.dim-h::after  { right: 0; border-width: 3.5px 0 3.5px 8px; border-left-color: var(--line); }

/* tick-terminator variant (architectural convention) */
.dim-ticks::before, .dim-ticks::after {
  border: 0;
  width: 10px; height: 1.5px;
  background: var(--line);
  top: -0.5px;
  transform: rotate(-45deg);
}
.dim-ticks::before { left: -5px; }
.dim-ticks::after  { right: -5px; }

/* vertical dimension beside portrait */
.dim-v {
  position: absolute;
  top: 0;
  right: -18px;
  bottom: 2.6rem; /* stop above the caption line */
  width: 1px;
  background: var(--line);
}
.dim-v::before, .dim-v::after {
  content: "";
  position: absolute;
  left: -4.5px;
  width: 10px; height: 1.5px;
  background: var(--line);
  transform: rotate(-45deg);
}
.dim-v::before { top: 0; }
.dim-v::after  { bottom: 0; }
.dim-v .dim-lbl {
  left: 50%; top: 50%;
  transform: translate(-50%, -50%) rotate(90deg);
  padding: 0 6px;
}

.portrait-frame .dim-h { margin: 10px 0 0; }

/* ---------- carousel ---------- */

.car-viewport {
  overflow: hidden;
  touch-action: pan-y;
  border: 1px solid var(--line);
  background-image: repeating-linear-gradient(45deg,
    transparent 0 7px, var(--line-faint) 7px 8px); /* hatch shows behind slide gaps */
}

.car-track {
  list-style: none;
  display: flex;
  transition: transform 0.25s ease-out;
}
@media (prefers-reduced-motion: reduce) {
  .car-track { transition: none; }
}

.car-slide { flex: 0 0 100%; min-width: 0; }
.car-slide figure { padding: 10px 10px 0; background: var(--blue); }
.car-slide img { border: 1px solid var(--line-faint); }
.car-slide .fig-line { padding: 0 10px 10px; margin-top: 0.6rem; }

/* caption text revealed on hover / focus; FIG. no always visible */
@media (hover: hover) {
  .fig-cap { opacity: 0; transition: opacity 0.15s; }
  .car-slide:hover .fig-cap,
  .carousel:focus-within .car-slide:not([aria-hidden="true"]) .fig-cap { opacity: 1; }
}

.car-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.75rem;
}

.car-btn {
  background: none;
  border: 1px solid var(--line);
  color: var(--ink);
  padding: 8px 10px;
  cursor: pointer;
  display: grid;
  place-items: center;
  min-height: 44px;
}
.car-btn:hover { color: var(--amber); border-color: var(--amber); }

.car-mid { text-align: center; }

.car-counter {
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  margin-bottom: 0.4rem;
}

.car-ticks { display: flex; justify-content: center; gap: 10px; }
.car-tick {
  background: none;
  border: 0;
  padding: 6px 3px;
  cursor: pointer;
  display: grid;
  place-items: center;
}
.car-tick::before {
  content: "";
  display: block;
  width: 2px; height: 12px;
  background: var(--line);
}
.car-tick[aria-current="true"]::before {
  background: var(--amber);
  height: 18px;
}
.car-tick:hover::before { background: var(--ink); }
.car-tick[aria-current="true"]:hover::before { background: var(--amber); }

/* ---------- minimal pages (home + cyberdeck) ---------- */

.wordmark-link { color: inherit; text-decoration: none; }
.wordmark-link:hover { color: var(--amber); }

.intro-min {
  min-height: inherit; /* fill the sheet frame exactly */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 1.4rem;
  padding: 3rem 1.25rem;
}

.stamp {
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.35em;
  color: var(--amber);
  border: 1.5px solid var(--amber);
  padding: 0.4rem 1rem 0.4rem 1.35rem; /* extra left pad balances tracking */
}

.tagline {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--ink-dim);
  max-width: 34ch;
}

.min-fig { width: min(240px, 70vw); }
.min-fig img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
}

.credits {
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.25em;
  color: var(--ink-dim);
  max-width: none;
}

.contact {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
}

.min-colophon {
  font-family: var(--mono);
  font-size: 0.55rem;
  letter-spacing: 0.25em;
  color: var(--ink-dim);
  margin-top: 0.5rem;
}

.signup-embed {
  display: block;
  max-width: 100%;
  border: 0;
}

/* ---------- workshops ---------- */

.ws-panel {
  position: relative;
  border: 1px solid var(--ink);
  padding: 1.25rem 1.25rem 1.5rem calc(1.25rem + 14px);
}
.ws-panel::before {
  /* hatched band along the panel edge */
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 14px;
  border-right: 1px solid var(--line);
  background-image: repeating-linear-gradient(45deg,
    transparent 0 5px, var(--line) 5px 6px);
}

.ws-note {
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: var(--ink-dim);
  border-bottom: 1px dashed var(--line);
  padding-bottom: 0.75rem;
  margin-bottom: 1rem;
  max-width: none;
}
.ws-copy p + p { margin-top: 1em; }

/* signup, drawn as a spec-sheet field */
.signup { margin-top: 1.5rem; }

.signup-label {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  margin-bottom: 0.75rem;
}

.signup-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  align-items: flex-end;
}

.signup-input {
  flex: 1 1 220px;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--ink);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  padding: 0.35rem 2px;
  border-radius: 0;
}
.signup-input::placeholder { color: rgba(214, 228, 240, 0.4); }
.signup-input:focus-visible {
  outline: none;
  border-bottom: 2px solid var(--amber);
  margin-bottom: -1px;
}

.signup-btn {
  flex: none;
  background: var(--amber);
  color: var(--blue);
  border: 1px solid var(--amber);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  padding: 0.65rem 1.2rem;
  cursor: pointer;
}
.signup-btn:hover { background: transparent; color: var(--amber); }

.signup-fine {
  margin-top: 0.75rem;
  font-size: 0.6rem;
  letter-spacing: 0.15em;
  color: var(--ink-dim);
}

.signup-confirm {
  margin-top: 1rem;
  border: 1px solid var(--amber);
  padding: 0.8rem 1rem;
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  line-height: 1.9;
  max-width: none;
}
.signup-confirm b { color: var(--amber); }

/* ---------- parts list + revision table ---------- */

.parts-list, .rev-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--ink);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}
.parts-list th, .rev-table th {
  text-align: left;
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: var(--ink-dim);
  border-bottom: 1px solid var(--ink);
}
.parts-list th, .parts-list td,
.rev-table th, .rev-table td {
  padding: 0.5rem 0.7rem;
  border-right: 1px solid var(--line-faint);
  vertical-align: top;
}
.parts-list td { border-top: 1px solid var(--line-faint); }
.rev-table td { border-top: 1px solid var(--line-faint); }
.parts-list a { word-break: break-word; }

/* ---------- footer ---------- */

.rev-footer {
  margin-top: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}
.colophon {
  margin-top: 0.9rem;
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  color: var(--ink-dim);
  max-width: none;
}

/* ---------- desktop ---------- */

@media (min-width: 720px) {
  body {
    background-image:
      repeating-linear-gradient(0deg,  var(--grid-minor) 0 1px, transparent 1px 8px),
      repeating-linear-gradient(90deg, var(--grid-minor) 0 1px, transparent 1px 8px),
      repeating-linear-gradient(0deg,  var(--grid-major) 0 1px, transparent 1px 40px),
      repeating-linear-gradient(90deg, var(--grid-major) 0 1px, transparent 1px 40px);
  }

  .sheet { margin: 18px; min-height: calc(100vh - 36px); }

  /* zone marker strips */
  .zones {
    display: flex;
    position: absolute;
    font-family: var(--mono);
    font-size: 0.62rem;
    letter-spacing: 0.1em;
    color: var(--ink-dim);
  }
  .zones span {
    flex: 1;
    display: grid;
    place-items: center;
  }
  .zones-top {
    top: 0; left: 24px; right: 0;
    height: 24px;
    border-bottom: 1px solid var(--line);
  }
  .zones-top span + span { border-left: 1px solid var(--line-faint); }
  .zones-side {
    flex-direction: column;
    top: 24px; bottom: 0; left: 0;
    width: 24px;
    border-right: 1px solid var(--line);
  }
  .zones-side span + span { border-top: 1px solid var(--line-faint); }

  .content { padding: 3.5rem 3rem 3rem; }

  .masthead {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    gap: 2.5rem;
  }
  .title-block { flex: none; width: 300px; }

  .leader { width: 56px; }

  .intro-grid {
    flex-direction: row;
    gap: 3.5rem;
    align-items: flex-start;
  }
  .intro-copy { flex: 1; }
  .fig-frame { flex: none; width: 300px; margin-right: 18px; }
}