/* P09 Handoff Blueprint — commodity reference view (CV-09).
   Reuses the concept-page grammar: dark ink sections with a faint drafting grid, paper lanes,
   signal yellow, coral, Arial body, monospace coordinates, 4px double / 2px dashed rules,
   offset shadows. No images, no motion, system fonts only. */
:root {
  color-scheme: light;
  --ink: #071b25;
  --ink-soft: #123744;
  --blueprint: #082a38;
  --blueprint-light: #164757;
  --paper: #f4f2e9;
  --paper-cool: #e8f1ef;
  --paper-warm: #fff2be;
  --paper-grey: #dedbd0;
  --white: #fffdf7;
  --signal: #f7cf4d;
  --coral: #e85831;
  --coral-deep: #9c2f13;
  --line-on-dark: #8db4bd;
  --muted-on-dark: #c7dadd;
  --focus-inner: #ffe36d;
  --focus-outer: #031117;
  --measure: 76rem;
  --wide: 96rem;
  --rule: 2px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background: var(--ink);
  font-size: 100%;
  scroll-behavior: auto;
}

body {
  margin: 0;
  min-width: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
}

[hidden] {
  display: none !important;
}

svg {
  max-width: 100%;
}

a {
  color: inherit;
  text-underline-offset: 0.2em;
  text-decoration-thickness: 0.12em;
}

button {
  font: inherit;
}

button,
a {
  touch-action: manipulation;
}

a:focus,
button:focus {
  outline: 3px solid var(--focus-inner);
  outline-offset: 3px;
  box-shadow: 0 0 0 6px var(--focus-outer);
}

h1,
h2,
h3,
p,
ol,
ul,
dl,
dd {
  margin-top: 0;
}

h1,
h2,
h3 {
  line-height: 1.12;
  text-wrap: balance;
}

p,
dd,
dt,
li,
button,
a {
  overflow-wrap: anywhere;
}

section,
footer,
header,
nav {
  min-width: 0;
}

section {
  scroll-margin-top: 1rem;
}

.blueprint {
  scroll-margin-top: 1rem;
}

/* ---------- header ---------- */
.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  min-height: 44px;
  padding: 0.65rem 1rem;
  background: var(--white);
  color: var(--ink);
  border: 3px solid var(--ink);
  font-weight: 800;
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  background: var(--ink);
  color: var(--white);
}

.catalog-notice {
  margin: 0;
  padding: 0.7rem clamp(1rem, 3vw, 3rem);
  background: var(--signal);
  color: var(--ink);
  border-bottom: var(--rule) solid var(--ink);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.01em;
  text-align: center;
}

.header-rail {
  width: min(100%, var(--wide));
  margin: 0 auto;
  padding: 1.1rem clamp(1rem, 4vw, 4rem);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 2rem;
}

.brand-lockup {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem 1rem;
  min-width: 0;
}

.brand-name {
  font-size: clamp(1.7rem, 3vw, 2.35rem);
  font-weight: 900;
  letter-spacing: -0.055em;
}

.brand-context {
  padding-left: 1rem;
  border-left: var(--rule) solid var(--signal);
  color: var(--muted-on-dark);
  font-size: 1rem;
  font-weight: 700;
}

.drawing-index {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  color: var(--muted-on-dark);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.drawing-index span {
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--line-on-dark);
}

.primary-nav {
  background: var(--blueprint-light);
  color: var(--white);
  border-block: var(--rule) solid var(--line-on-dark);
}

.primary-nav ul {
  width: min(100%, var(--wide));
  margin: 0 auto;
  padding: 0 clamp(0.5rem, 4vw, 4rem);
  display: flex;
  flex-wrap: wrap;
  list-style: none;
}

.primary-nav li {
  border-inline-start: 1px solid var(--line-on-dark);
}

.primary-nav li:last-child {
  border-inline-end: 1px solid var(--line-on-dark);
}

.primary-nav a {
  min-height: 46px;
  padding: 0.65rem 1rem;
  display: flex;
  align-items: center;
  color: var(--white);
  font-size: 0.875rem;
  font-weight: 800;
  letter-spacing: 0.055em;
  text-decoration: none;
  text-transform: uppercase;
}

.primary-nav a:hover {
  background: var(--signal);
  color: var(--ink);
}

/* ---------- sections ---------- */
.blueprint-section {
  position: relative;
  padding: clamp(3rem, 6vw, 5.5rem) clamp(1rem, 4vw, 4rem);
}

.blueprint-section > * {
  position: relative;
  z-index: 1;
  width: min(100%, var(--wide));
  margin-inline: auto;
}

.blueprint-grid {
  position: absolute;
  z-index: 0;
  inset: 0;
  width: 100%;
  margin: 0;
  background-image:
    linear-gradient(rgba(141, 180, 189, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(141, 180, 189, 0.12) 1px, transparent 1px),
    linear-gradient(rgba(141, 180, 189, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(141, 180, 189, 0.05) 1px, transparent 1px);
  background-size: 72px 72px, 72px 72px, 18px 18px, 18px 18px;
  pointer-events: none;
}

.section-coordinate {
  margin-bottom: 1.3rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.875rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  opacity: 0.8;
}

.section-heading-row {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 1rem 2rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.2rem;
  border-bottom: var(--rule) solid currentColor;
}

.section-heading-row h2 {
  max-width: 18ch;
  margin-bottom: 0;
  font-size: clamp(1.9rem, 4.5vw, 3.6rem);
  letter-spacing: -0.045em;
}

.section-note {
  max-width: 44rem;
  margin-bottom: 0;
  font-weight: 700;
}

.eyebrow,
.mini-label,
.lane-code,
.boundary-label,
.set-label,
.canon-label,
.section-key,
.seq-set,
.set-stamp {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.875rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.eyebrow {
  margin-bottom: 0.7rem;
}

/* ---------- overview (dark) ---------- */
.overview {
  overflow: hidden;
  background-color: var(--blueprint);
  color: var(--white);
}

.overview-copy {
  margin-bottom: clamp(2rem, 4vw, 3rem);
}

.overview h1 {
  max-width: 16ch;
  margin-bottom: 1.5rem;
  font-size: clamp(2.2rem, 6vw, 5.4rem);
  letter-spacing: -0.06em;
}

.service-definition {
  max-width: 54rem;
  margin-bottom: 1rem;
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  font-weight: 700;
}

.dataset-line {
  margin-bottom: 0;
  color: var(--muted-on-dark);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1rem;
}

.opening-blueprint {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: var(--rule) solid var(--white);
  box-shadow: 12px 12px 0 rgba(0, 0, 0, 0.28);
}

.opening-lane {
  min-width: 0;
  padding: clamp(1.2rem, 3vw, 2.4rem);
  color: var(--ink);
}

.opening-lane + .opening-lane {
  border-inline-start: var(--rule) solid var(--ink);
}

.opening-lane p:last-child {
  margin-bottom: 0;
}

.buyer-lane {
  background: var(--paper-cool);
  border-top: 5px solid var(--ink);
}

.specialist-lane {
  background: var(--paper-warm);
  border-top: 8px double var(--ink);
}

.lane-code {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1.2rem;
}

.lane-code span {
  min-width: 2rem;
  padding: 0.2rem 0.35rem;
  border: 2px solid currentColor;
  text-align: center;
}

.opening-boundary {
  grid-column: 1 / -1;
  padding: 1.2rem clamp(1.2rem, 3vw, 2.4rem);
  background: var(--ink);
  color: var(--white);
  border-top: 4px double var(--signal);
  border-bottom: 2px dashed var(--signal);
}

.opening-boundary p:last-child,
.how-to-read {
  margin-bottom: 0;
}

.boundary-label {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.8rem;
  color: var(--signal);
}

.gate {
  display: inline-block;
  width: 0.9rem;
  height: 0.9rem;
  border: 3px solid currentColor;
  transform: rotate(45deg);
  flex: none;
}

.back-link-row {
  margin: 2rem 0 0;
}

.back-link {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0.6rem 1.1rem;
  background: var(--signal);
  color: var(--ink);
  border: var(--rule) solid var(--white);
  box-shadow: 5px 5px 0 var(--white);
  font-weight: 900;
  text-decoration: none;
}

.back-link:hover {
  background: var(--white);
}

/* ---------- lane key ---------- */
.lane-key {
  background: var(--paper);
  color: var(--ink);
}

.legend {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1rem;
}

.legend li {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr);
  align-items: start;
  gap: 1rem;
  padding: 1rem;
  background: var(--white);
  border: var(--rule) solid var(--ink);
}

.key-line {
  display: inline-block;
  width: 2.5rem;
  height: 0;
  margin-top: 0.7em;
  border-top: 3px solid currentColor;
}

.double-key {
  border-top-style: double;
  border-top-width: 7px;
}

.dashed-key {
  border-top-style: dashed;
}

.section-key {
  max-width: 32rem;
  margin-bottom: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.8rem;
}

.section-key .key-line {
  margin-top: 0;
}

/* ---------- emphasis interaction ---------- */
.emphasis {
  background: var(--paper-grey);
  color: var(--ink);
}

.emphasis-panel {
  margin-bottom: 1.5rem;
  padding: clamp(1.2rem, 3vw, 2rem);
  background: var(--blueprint);
  color: var(--white);
  border: var(--rule) solid var(--ink);
  box-shadow: 8px 8px 0 var(--ink);
}

.mini-label {
  margin-bottom: 0.8rem;
}

.emphasis-panel .mini-label {
  color: var(--signal);
}

.emphasis-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 0.7rem;
}

.emphasis-controls button {
  min-height: 52px;
  padding: 0.7rem 0.85rem;
  background: transparent;
  color: var(--white);
  border: 2px solid var(--line-on-dark);
  border-radius: 0;
  font-weight: 800;
  cursor: pointer;
}

.emphasis-controls button:hover {
  border-color: var(--signal);
}

.emphasis-controls button[aria-pressed="true"] {
  background: var(--signal);
  color: var(--ink);
  border: 4px double var(--ink);
}

.emphasis-status {
  margin: 1rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line-on-dark);
  color: var(--white);
  font-weight: 700;
}

html.no-js .emphasis-controls,
html.no-js .emphasis-status {
  display: none;
}

.blueprint-sequence-list {
  padding: clamp(1.2rem, 3vw, 2rem);
  background: var(--white);
  border: var(--rule) solid var(--ink);
}

.sequence {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 1rem 2rem;
}

.sequence > li {
  padding-top: 0.6rem;
  border-top: 3px solid var(--ink);
}

.seq-set {
  display: block;
  margin-bottom: 0.4rem;
}

.sequence ol {
  margin: 0;
  padding-left: 1.4rem;
}

.sequence ol li {
  padding: 0.25rem 0;
}

.sequence a {
  display: inline-block;
  min-height: 44px;
  padding: 0.55rem 0.2rem;
  font-weight: 700;
}

/* ---------- catalog: sheet sets and blueprints ---------- */
.catalog {
  background: var(--paper);
  color: var(--ink);
}

.sheet-set {
  margin-top: 2.5rem;
}

.set-label {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1rem;
  margin-bottom: 1rem;
  padding: 0.6rem 0.9rem;
  background: var(--ink);
  color: var(--white);
  border-left: 8px solid var(--signal);
}

.set-count {
  color: var(--muted-on-dark);
}

.set-stamp {
  padding: 0.15rem 0.5rem;
  background: var(--coral);
  color: var(--white);
}

.sheet-set.is-emphasised .set-label {
  border-left-color: var(--coral);
  outline: 4px double var(--coral);
  outline-offset: 3px;
}

.blueprint {
  position: relative;
  margin: 0 0 2rem;
  border: var(--rule) solid var(--ink);
  background: var(--white);
  box-shadow: 8px 8px 0 rgba(7, 27, 37, 0.14);
}

.sheet-set.is-emphasised .blueprint {
  outline: 4px double var(--coral);
  outline-offset: 5px;
  box-shadow: 12px 12px 0 var(--ink);
}

.blueprint:last-child {
  margin-bottom: 0;
}

.bp-title-row {
  min-width: 0;
  padding: 1rem clamp(1rem, 3vw, 2rem);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.6rem 1rem;
  background: var(--ink);
  color: var(--white);
}

.bp-title-row h3 {
  margin-bottom: 0;
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  letter-spacing: -0.03em;
}

.sheet-no {
  min-width: 3.4rem;
  padding-right: 1rem;
  border-right: var(--rule) solid var(--signal);
  color: var(--signal);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1.25rem;
  font-weight: 900;
}

.bp-cat {
  padding: 0.25rem 0.6rem;
  border: 2px solid var(--line-on-dark);
  color: var(--white);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.875rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.bp-canonical {
  padding: 1.1rem clamp(1rem, 3vw, 2rem);
  background: var(--paper-grey);
  border-bottom: var(--rule) solid var(--ink);
}

.canon-label {
  margin-bottom: 0.4rem;
  color: var(--ink-soft);
}

.bp-canonical p:last-child {
  margin-bottom: 0;
  font-weight: 700;
}

.bp-lanes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.lane {
  min-width: 0;
  padding: clamp(1.2rem, 3vw, 2rem);
}

.lane-you {
  background: var(--paper-cool);
  border-top: 5px solid var(--ink);
  border-right: var(--rule) solid var(--ink);
}

.lane-spec {
  background: var(--paper-warm);
  border-top: 8px double var(--ink);
}

.lane-list {
  margin: 0;
}

.lane-list dt {
  margin: 1.1rem 0 0.35rem;
  padding-bottom: 0.2rem;
  border-bottom: 1px solid var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.875rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lane-list dt:first-child {
  margin-top: 0;
}

.lane-list dd {
  margin: 0;
}

.lane-list ul,
.lane-list ol {
  margin: 0;
  padding-left: 1.4rem;
}

.lane-list li {
  margin-bottom: 0.4rem;
}

.price-line {
  padding: 0.8rem 1rem;
  background: var(--white);
  border: var(--rule) solid var(--ink);
  border-left: 8px double var(--ink);
  font-size: 1rem;
  line-height: 1.6;
}

.price-value {
  font-size: 1.35em;
  font-weight: 900;
}

.bp-boundary {
  position: relative;
  padding: 1rem clamp(1rem, 3vw, 2rem);
  background: var(--blueprint);
  color: var(--white);
  border-top: 4px double var(--signal);
  border-bottom: 2px dashed var(--signal);
}

.bp-boundary .lane-list dt {
  border-bottom-color: var(--line-on-dark);
  color: var(--signal);
}

.bp-boundary a {
  color: var(--white);
}

/* ---------- next step / limits / footer ---------- */
.next-step {
  background: var(--paper-grey);
  color: var(--ink);
}

.handoff-copy {
  max-width: 54rem;
  margin-bottom: 0;
  padding: 1.2rem clamp(1rem, 3vw, 2rem);
  background: var(--white);
  border: var(--rule) solid var(--ink);
  border-left: 8px double var(--ink);
  font-size: 1.1rem;
  font-weight: 700;
}

.limits {
  overflow: hidden;
  background: var(--blueprint);
  color: var(--white);
}

.limits-copy {
  max-width: 54rem;
  margin-bottom: 0;
  padding: 1.2rem clamp(1rem, 3vw, 2rem);
  border-top: 4px double var(--signal);
  border-bottom: 2px dashed var(--signal);
  font-size: 1.1rem;
  font-weight: 700;
}

.site-footer {
  background: var(--ink);
  color: var(--white);
  border-top: var(--rule) solid var(--signal);
}

.site-footer p {
  width: min(100%, var(--wide));
  margin: 0 auto;
  padding: 1.2rem clamp(1rem, 4vw, 4rem);
  font-weight: 700;
}

/* ---------- responsive: lanes pair within each blueprint (R9) ---------- */
@media (max-width: 47.99rem) {
  .opening-blueprint,
  .bp-lanes {
    grid-template-columns: minmax(0, 1fr);
  }

  .opening-lane + .opening-lane {
    border-inline-start: 0;
  }

  .lane-you {
    border-right: 0;
    border-bottom: var(--rule) solid var(--ink);
  }

  .bp-title-row {
    grid-template-columns: auto minmax(0, 1fr);
  }

  .bp-cat {
    grid-column: 1 / -1;
    justify-self: start;
  }

  .opening-blueprint,
  .emphasis-panel,
  .blueprint {
    box-shadow: 6px 6px 0 rgba(7, 27, 37, 0.3);
  }

  .legend li {
    grid-template-columns: 3rem minmax(0, 1fr);
    padding: 0.8rem;
  }
}

@media (max-width: 24rem) {
  .sheet-no {
    min-width: 2.6rem;
    padding-right: 0.6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

@media (forced-colors: active) {
  .lane-you,
  .lane-spec,
  .bp-boundary,
  .opening-lane,
  .opening-boundary,
  .price-line,
  .blueprint,
  .emphasis-controls button {
    border-color: CanvasText;
  }

  .emphasis-controls button[aria-pressed="true"] {
    outline: 4px double Highlight;
  }
}