:root {
  --ink: #0a0a0a;
  --paper: #ffffff;
  --paper-alt: #f7f7f5;
  --line: #0a0a0a;
  --line-soft: #d4d4d4;
  --mono: ui-monospace, "SF Mono", "Roboto Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
}
a { color: inherit; }
.wrap { max-width: 1180px; margin: 0 auto; padding-inline: 24px; }

/* running head */
.running-head {
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.running-head .bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-block: 10px;
}
.running-head .flag { width: 18px; height: 13px; display: inline-block; vertical-align: middle; margin-left: 8px; border: 1px solid var(--line); }
nav.main {
  display: flex;
  gap: 22px;
  font-family: var(--mono);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}
nav.main a { text-decoration: none; opacity: 0.7; transition: opacity 0.15s ease; }
nav.main a:hover, nav.main a.active { opacity: 1; text-decoration: underline; }

/* hero */
.hero {
  min-height: 82vh;
  display: flex;
  align-items: center;
  background: var(--paper-alt);
  padding-block: 48px;
}
.hero-inner { width: 100%; }
.sheet-label { text-align: right; font-family: var(--mono); font-size: 0.85rem; margin-bottom: 12px; }
.plate {
  position: relative;
  background: var(--paper);
  border: 2px solid var(--line);
  min-height: 60vh;
}
.corner { position: absolute; width: 26px; height: 26px; border-color: var(--line); }
.corner.tl { top: -14px; left: -14px; border-left: 2px solid; border-top: 2px solid; }
.corner.tr { top: -14px; right: -14px; border-right: 2px solid; border-top: 2px solid; }
.corner.bl { bottom: -14px; left: -14px; border-left: 2px solid; border-bottom: 2px solid; }
.corner.br { bottom: -14px; right: -14px; border-right: 2px solid; border-bottom: 2px solid; }
.plate-inner {
  display: flex;
  flex-wrap: wrap;
  min-height: 60vh;
}
.plate-drawing {
  flex: 1 1 420px;
  padding: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.plate-drawing svg { width: 100%; height: auto; max-width: 640px; }
.plate-side {
  flex: 0 0 320px;
  border-left: 2px solid var(--line);
  display: flex;
  flex-direction: column;
}
.plate-title { border-bottom: 2px solid var(--line); background: var(--paper-alt); padding: 24px; }
.plate-title h1 { font-size: 2.2rem; margin: 0 0 10px; }
.plate-title p { margin: 0 0 18px; font-size: 1.02rem; }
.plate-body { flex: 1; padding: 24px; font-family: var(--mono); font-size: 0.86rem; }
.plate-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.plate-grid .lbl { font-weight: 700; }
.plate-dims { margin-top: 20px; border-top: 1px solid var(--line); padding-top: 16px; }
.plate-dims .row { display: flex; justify-content: space-between; padding-block: 3px; }
.plate-footer { border-top: 2px solid var(--line); background: var(--paper-alt); padding: 16px 24px; font-family: var(--mono); font-size: 0.75rem; display: flex; justify-content: space-between; }
.plate-footer .r { text-align: right; }

/* buttons */
.btn {
  display: inline-block;
  background: var(--ink);
  color: var(--paper);
  border: none;
  font-weight: 700;
  font-family: var(--sans);
  padding: 13px 26px;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
  transition: background 0.15s ease;
}
.btn:hover { background: #333; }
.btn.block { display: block; width: 100%; }
.btn.outline {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
  font-weight: 600;
  padding: 11px 20px;
}
.btn.outline:hover { background: var(--paper-alt); }

/* separator */
.plate-separator { border-top: 1px solid var(--line-soft); }

/* sections */
section.plain { padding-block: 88px; }
section.plain.alt { background: var(--paper-alt); }
h2.section-title { font-size: clamp(1.7rem, 3.4vw, 2.4rem); margin: 0 0 28px; }
.kicker { font-style: italic; font-size: 1.15rem; margin: -14px 0 32px; }
.measure { max-width: 74ch; font-size: 1.08rem; }
.measure p { margin: 0 0 22px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; font-size: 1rem; }
.two-col p { margin: 0 0 18px; }
.footnotes { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 0.85rem; }
.footnotes .grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 24px; margin-top: 10px; }
.footnotes em { color: #555; }

/* property tables */
.prop-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; margin-top: 32px; }
.prop-block h4 { border-bottom: 1px solid var(--line); padding-bottom: 8px; margin: 0 0 12px; font-size: 1rem; }
.prop-row { display: flex; justify-content: space-between; font-family: var(--mono); font-size: 0.86rem; padding-block: 3px; }

/* figure grid */
.fig-grid { display: grid; gap: 18px; margin-top: 28px; }
.fig { position: relative; border: 1px solid var(--line); aspect-ratio: 1; display: flex; align-items: center; justify-content: center; background: var(--paper-alt); overflow: hidden; }
.fig svg { width: 78%; height: 78%; }
.fig .cap { position: absolute; bottom: 8px; left: 8px; background: var(--paper); padding: 3px 8px; font-size: 0.72rem; font-style: italic; }

/* spec sheet */
.specsheet { border: 2px solid var(--line); background: var(--paper); margin-top: 24px; }
.specsheet .head { display: grid; grid-template-columns: 8fr 2fr 2fr; border-bottom: 2px solid var(--line); font-family: var(--mono); }
.specsheet .head > div { padding: 12px; border-right: 1px solid var(--line); }
.specsheet .head > div:last-child { border-right: none; text-align: center; }
.specsheet .head .t { font-weight: 700; font-size: 1.05rem; }
.specsheet .head .s { font-size: 0.82rem; }
.specsheet .cols { display: grid; grid-template-columns: 1fr 1fr; }
.specsheet .cols > div { border-right: 1px solid var(--line); }
.specsheet .cols > div:last-child { border-right: none; }
.specsheet .colhead { background: var(--paper-alt); border-bottom: 1px solid var(--line); padding: 8px 12px; font-weight: 700; font-family: var(--mono); font-size: 0.85rem; }
.spectable { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 0.86rem; }
.spectable td { padding: 8px 12px; border-bottom: 1px solid var(--line-soft); }
.spectable td:last-child { text-align: right; }
.spectable tr:last-child td { border-bottom: none; }
.specsheet .foot { border-top: 2px solid var(--line); background: var(--paper-alt); padding: 12px 16px; font-family: var(--mono); font-size: 0.75rem; display: grid; grid-template-columns: repeat(4,1fr); gap: 12px; }

/* faq */
.faq-group h3 { border-bottom: 1px solid var(--line); padding-bottom: 10px; margin: 40px 0 20px; font-size: 1.3rem; }
.faq-group:first-of-type h3 { margin-top: 0; }
.faq-item { margin-bottom: 18px; }
.faq-item h4 { margin: 0 0 4px; font-size: 1rem; }
.faq-item p { margin: 0; color: #333; }

/* footer */
footer.site { border-top: 1px solid var(--line); padding-block: 36px; font-family: var(--mono); font-size: 0.8rem; }
footer.site .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* order page */
.order-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }
.panel { border: 2px solid var(--line); background: var(--paper); }
.panel .phead { display: grid; grid-template-columns: 8fr 2fr 2fr; border-bottom: 1px solid var(--line); font-family: var(--mono); }
.panel .phead > div { padding: 12px; border-right: 1px solid var(--line); }
.panel .phead > div:last-child { border-right: none; text-align: center; }
.panel .phead .t { font-weight: 700; }
.panel .phead .s { font-size: 0.8rem; }
.panel .pbody { padding: 16px; }
.field-group { margin-bottom: 20px; }
.field-group .cap { border-bottom: 1px solid var(--line); background: var(--paper-alt); padding: 8px; margin-bottom: 14px; font-weight: 700; font-family: var(--mono); font-size: 0.82rem; }
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.field { margin-bottom: 0; }
.field label { display: block; font-size: 0.72rem; font-weight: 700; font-family: var(--mono); margin-bottom: 4px; text-transform: uppercase; }
.field select, .field input, .field textarea {
  width: 100%;
  border: 1px solid var(--line);
  padding: 9px;
  font-family: var(--mono);
  font-size: 0.82rem;
  background: var(--paper);
  color: var(--ink);
}
.field textarea { resize: vertical; min-height: 70px; }
.panel .pfoot { border-top: 2px solid var(--line); background: var(--paper-alt); padding: 16px; }
.pfoot-actions { display: grid; gap: 10px; }
.note { font-size: 0.8rem; color: #444; margin-top: 10px; }
.required-flag { color: #b00; }

@media (max-width: 900px) {
  .plate-inner { flex-direction: column; }
  .plate-side { flex: none; border-left: none; border-top: 2px solid var(--line); }
  .two-col { grid-template-columns: 1fr; }
  .prop-grid { grid-template-columns: 1fr 1fr; }
  .order-grid { grid-template-columns: 1fr; }
  .field-row { grid-template-columns: 1fr; }
  .fig-grid { grid-template-columns: 1fr; }
  nav.main { display: none; }
}
@media (max-width: 560px) {
  .prop-grid { grid-template-columns: 1fr; }
}