:root {
  color-scheme: light;
  --washi: #ecebe6;
  --sheet: #f5f4ef;
  --indigo: #16263a;
  --indigo-soft: #3a4c63;
  --indigo-grid: rgba(22, 38, 58, 0.085);
  --indigo-fine: rgba(22, 38, 58, 0.04);
  --vermilion: #d63826;
  --vermilion-dark: #b52b1b;
  --cedar: #8e6a4e;
  --mono: ui-monospace, 'Cascadia Code', 'JetBrains Mono', Consolas, monospace;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
  font-family: var(--sans);
  background-color: var(--washi);
  background-image:
    linear-gradient(to right, var(--indigo-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--indigo-grid) 1px, transparent 1px),
    linear-gradient(to right, var(--indigo-fine) 1px, transparent 1px),
    linear-gradient(to bottom, var(--indigo-fine) 1px, transparent 1px);
  background-size: 100px 100px, 100px 100px, 20px 20px, 20px 20px;
  color: var(--indigo);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}

body {
  margin: 0;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

a,
summary {
  -webkit-tap-highlight-color: transparent;
}

a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--vermilion);
  outline-offset: 3px;
}

::selection {
  background: var(--vermilion);
  color: #ffffff;
}

h1,
h2,
h3,
p,
dl,
dd,
pre {
  margin: 0;
}

.skip-link {
  position: fixed;
  top: -120px;
  inset-inline-start: 20px;
  background: var(--vermilion);
  color: #ffffff;
  border: 1.5px solid var(--indigo);
  padding: 10px 18px;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  z-index: 40;
}

.skip-link:focus {
  top: 14px;
}

.drafting-sheet {
  width: min(1380px, calc(100% - 40px));
  margin-inline: auto;
  margin-block: 16px 56px;
  border: 1.5px solid var(--indigo);
  background-color: rgba(236, 235, 230, 0.72);
}

/* ─── TOP MILLIMETER RULER & DRAFTING HEADER ─── */
.ruler-strip {
  border-bottom: 1.5px solid var(--indigo);
  background: var(--sheet);
  padding: 18px 18px 6px;
  background-image:
    repeating-linear-gradient(
      to right,
      var(--indigo) 0,
      var(--indigo) 1px,
      transparent 1px,
      transparent 8px
    ),
    repeating-linear-gradient(
      to right,
      var(--indigo) 0,
      var(--indigo) 1.5px,
      transparent 1.5px,
      transparent 40px
    );
  background-size: 100% 7px, 100% 13px;
  background-position: top left;
  background-repeat: repeat-x;
}

.ruler-coords {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--indigo-soft);
  letter-spacing: 0.04em;
}

.blueprint-nav-row {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  border-bottom: 1.5px solid var(--indigo);
  background: var(--washi);
}

.brand-cell {
  display: flex;
  align-items: center;
  padding: 13px 20px;
  border-inline-end: 1.5px solid var(--indigo);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
}

.nav-cells {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 22px;
  padding: 10px 20px;
  margin-inline-start: auto;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav-cells > a:not(.btn-seal):hover {
  color: var(--vermilion);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* ─── LANGUAGE MENU ─── */
.language-menu {
  position: relative;
}

.language-menu > summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border: 1.5px solid var(--indigo);
  background: var(--sheet);
  cursor: pointer;
  list-style: none;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
}

.language-menu > summary::-webkit-details-marker {
  display: none;
}

.language-options {
  position: absolute;
  inset-inline-end: 0;
  top: calc(100% + 5px);
  z-index: 30;
  width: 310px;
  max-height: 70vh;
  overflow-y: auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3px;
  padding: 8px;
  background: var(--sheet);
  border: 1.5px solid var(--indigo);
  box-shadow: 0 10px 24px rgba(22, 38, 58, 0.14);
}

.language-options a {
  padding: 6px 8px;
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  text-transform: none;
}

.language-options a:hover,
.language-options a[aria-current="true"] {
  background: var(--vermilion);
  color: #ffffff;
}

/* ─── BUTTONS & VERMILION HANKO STAMP ─── */
.btn-seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  background: var(--vermilion);
  color: #ffffff;
  border: 1.5px solid var(--vermilion-dark);
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: background 0.15s ease;
}

.btn-seal:hover {
  background: var(--vermilion-dark);
}

.btn-seal-small {
  padding: 7px 14px;
  font-size: 11px;
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 22px;
  background: var(--sheet);
  color: var(--indigo);
  border: 1.5px solid var(--indigo);
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.btn-outline:hover {
  border-color: var(--vermilion);
  color: var(--vermilion);
}

.arrow {
  flex-shrink: 0;
}

[dir='rtl'] .arrow {
  transform: scaleX(-1);
}

/* ─── HERO SECTION ─── */
.blueprint-hero {
  display: grid;
  grid-template-columns: 0.96fr 1.14fr;
  gap: 36px;
  align-items: center;
  padding: 44px 38px 50px;
  border-bottom: 1.5px solid var(--indigo);
}

.dwg-label {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--cedar);
  border-bottom: 1.5px solid var(--cedar);
  padding-bottom: 3px;
}

h1 {
  margin-top: 14px;
  font-size: clamp(38px, 4.4vw, 60px);
  font-weight: 750;
  line-height: 1.06;
  letter-spacing: -0.03em;
}

h1 span {
  display: block;
}

.h1-sub {
  margin-top: 6px;
  font-size: clamp(22px, 2.5vw, 34px);
  font-weight: 650;
  color: var(--indigo-soft);
}

.hanko-stamp {
  display: inline-grid;
  grid-template-columns: 54px 1fr;
  align-items: center;
  gap: 14px;
  margin-top: 24px;
  padding: 10px 16px 10px 10px;
  border: 1.5px solid var(--vermilion);
  border-radius: 4px;
  background: rgba(214, 56, 38, 0.035);
}

.hanko-seal-glyph {
  width: 54px;
  height: 54px;
  border: 2px solid var(--vermilion);
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  padding: 3px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 900;
  color: var(--vermilion);
  line-height: 1;
  text-align: center;
}

.hanko-seal-glyph span {
  display: flex;
  align-items: center;
  justify-content: center;
  border: 0.5px solid rgba(214, 56, 38, 0.45);
}

.hanko-rates {
  display: grid;
  gap: 4px;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--indigo);
}

.hero-copy-text {
  margin-top: 22px;
  display: grid;
  gap: 12px;
}

.hero-copy-text p {
  font-size: 16px;
  line-height: 1.58;
  color: var(--indigo-soft);
  max-width: 54ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

/* ─── AXONOMETRIC BLUEPRINT STAGE ─── */
.axonometric-stage {
  position: relative;
  padding: 22px;
  border: 1px dashed rgba(22, 38, 58, 0.35);
  background: rgba(245, 244, 239, 0.65);
}

.reg-cross {
  position: absolute;
  width: 16px;
  height: 16px;
  pointer-events: none;
}

.reg-cross::before,
.reg-cross::after {
  content: '';
  position: absolute;
  background: var(--indigo);
}

.reg-cross::before {
  width: 16px;
  height: 1px;
  top: 7.5px;
  left: 0;
}

.reg-cross::after {
  width: 1px;
  height: 16px;
  left: 7.5px;
  top: 0;
}

.reg-tl { top: -8px; left: -8px; }
.reg-tr { top: -8px; right: -8px; }
.reg-bl { bottom: -8px; left: -8px; }
.reg-br { bottom: -8px; right: -8px; }

.blueprint-svg {
  display: block;
  width: 100%;
  height: auto;
}

.axonometric-callouts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 14px;
}

.callout-box {
  padding: 12px 14px;
  background: var(--sheet);
  border: 1.5px solid var(--indigo);
  font-family: var(--mono);
  font-size: 12px;
}

.callout-box strong {
  display: block;
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--vermilion);
  margin-bottom: 4px;
}

.callout-box code {
  display: block;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--indigo);
  line-height: 1.45;
}

/* ─── SECTIONS & BLUEPRINT SPEC TABLE ─── */
.blueprint-section {
  padding: 42px 38px;
  border-bottom: 1.5px solid var(--indigo);
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.section-head h2 {
  font-family: var(--mono);
  font-size: clamp(19px, 2.2vw, 25px);
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.section-code {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--cedar);
}

.blueprint-table-wrap {
  position: relative;
  overflow-x: auto;
}

.blueprint-table {
  width: 100%;
  border-collapse: collapse;
  border: 1.5px solid var(--indigo);
  background: rgba(245, 244, 239, 0.78);
  font-family: var(--mono);
  font-size: 13.5px;
}

.blueprint-table th,
.blueprint-table td {
  border: 1.5px solid var(--indigo);
  padding: 13px 16px;
  text-align: start;
}

.blueprint-table thead th {
  background: rgba(22, 38, 58, 0.07);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.03em;
}

.blueprint-table tbody th {
  font-weight: 700;
  background: rgba(22, 38, 58, 0.03);
}

.blueprint-table .vermilion-cell {
  color: var(--vermilion);
  font-weight: 800;
}

.spec-footnote {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--indigo-soft);
}

/* ─── MODULAR ENGINEERING WORKFLOW CARDS ─── */
.workflows-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 28px;
}

.workflow-card {
  position: relative;
  padding: 28px 22px 22px;
  border: 1.5px solid var(--indigo);
  background: var(--sheet);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.cedar-tab {
  position: absolute;
  top: -12px;
  inset-inline-start: 18px;
  padding: 3px 12px;
  background: var(--cedar);
  color: #ffffff;
  border-radius: 3px;
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.corner-ticks {
  position: absolute;
  inset: 8px;
  pointer-events: none;
  background:
    linear-gradient(to right, var(--indigo) 10px, transparent 10px) 0 0,
    linear-gradient(to bottom, var(--indigo) 10px, transparent 10px) 0 0,
    linear-gradient(to left, var(--indigo) 10px, transparent 10px) 100% 0,
    linear-gradient(to bottom, var(--indigo) 10px, transparent 10px) 100% 0,
    linear-gradient(to right, var(--indigo) 10px, transparent 10px) 0 100%,
    linear-gradient(to top, var(--indigo) 10px, transparent 10px) 0 100%,
    linear-gradient(to left, var(--indigo) 10px, transparent 10px) 100% 100%,
    linear-gradient(to top, var(--indigo) 10px, transparent 10px) 100% 100%;
  background-repeat: no-repeat;
  background-size: 10px 1px, 1px 10px;
}

.workflow-card h3 {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.workflow-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  border: 1px dashed rgba(22, 38, 58, 0.25);
  background: var(--washi);
}

.workflow-card p {
  font-size: 14.5px;
  color: var(--indigo-soft);
  line-height: 1.52;
}

.workflow-prompt {
  margin-top: auto;
  padding: 9px 11px;
  border-top: 1px solid rgba(22, 38, 58, 0.2);
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 700;
  color: var(--indigo);
}

/* ─── PRICING & COMPARISON LEDGER ─── */
.pricing-blueprint-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 24px;
}

.ledger-panel,
.sponsor-panel {
  border: 1.5px solid var(--indigo);
  background: var(--sheet);
  padding: 24px;
}

.ledger-panel h3,
.sponsor-panel h3 {
  font-family: var(--mono);
  font-size: 17px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.ledger-note {
  margin-top: 6px;
  font-size: 14px;
  color: var(--indigo-soft);
}

.rate-rows {
  margin-top: 18px;
  border-top: 1.5px solid var(--indigo);
}

.rate-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(22, 38, 58, 0.22);
}

.rate-row dt {
  font-weight: 700;
  font-size: 14.5px;
}

.rate-row dt small {
  display: block;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--indigo-soft);
  font-weight: 500;
}

.rate-row dd {
  font-family: var(--mono);
  font-size: 19px;
  font-weight: 800;
  white-space: nowrap;
}

.sponsor-panel {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
  border-top: 4px solid var(--vermilion);
}

.compare-points {
  margin: 0;
  padding-inline-start: 18px;
  display: grid;
  gap: 9px;
  font-size: 14.5px;
  color: var(--indigo-soft);
}

/* ─── FAQ ACCORDION ─── */
.faq-blueprint-list {
  border: 1.5px solid var(--indigo);
  background: var(--sheet);
}

.faq-blueprint-item + .faq-blueprint-item {
  border-top: 1.5px solid var(--indigo);
}

.faq-blueprint-item summary {
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 700;
  list-style: none;
}

.faq-blueprint-item summary::-webkit-details-marker {
  display: none;
}

.faq-chevron {
  transition: transform 0.15s ease;
  flex-shrink: 0;
}

.faq-blueprint-item[open] .faq-chevron {
  transform: rotate(180deg);
}

.faq-blueprint-item p {
  padding: 0 20px 18px;
  font-size: 15px;
  color: var(--indigo-soft);
  line-height: 1.58;
}

/* ─── FOOTER ─── */
.blueprint-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding: 18px 38px;
  background: var(--sheet);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
}

.blueprint-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
}

.blueprint-footer nav a:hover {
  color: var(--vermilion);
}

/* ─── RESPONSIVE ─── */
@media (max-width: 1080px) {
  .blueprint-hero,
  .pricing-blueprint-grid {
    grid-template-columns: 1fr;
  }

  .workflows-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 740px) {
  .drafting-sheet {
    width: calc(100% - 20px);
  }

  .blueprint-nav-row {
    flex-direction: column;
  }

  .brand-cell {
    border-inline-end: 0;
    border-bottom: 1.5px solid var(--indigo);
  }

  .nav-cells {
    margin-inline-start: 0;
  }

  .blueprint-hero,
  .blueprint-section,
  .blueprint-footer {
    padding-inline: 18px;
  }

  .axonometric-callouts {
    grid-template-columns: 1fr;
  }
}