/* commerce/01-meridian-atlas/skin.css — P01 Meridian Atlas persona skin (component SK-A).
   Hand-authored by SK-A-P01-skin-builder. Loads after commerce/base/flow.css and overrides only what
   R5 §11 allows: type, colour/material, component geometry, layout/composition, illustrative CSS
   imagery, density, responsive transformation and the persona chrome. No wording, numbers or DOM order.
   Tokens/geometry: samples/01-meridian-atlas/styles.css (paper/ink/sea-teal, coordinate rules,
   key shapes, route markers, legend plates). Structural flags on <body data-skin-*> (commerce/skins.json):
   catalog=stops · breakdown=plate · scheme=light · density=regular · nav=inline. */

/* ---------- tokens (single light scheme — the concept page is light-only) ---------- */
:root {
  color-scheme: light;
  --paper: #f4f0e4;
  --paper-deep: #e9e1ce;
  --paper-light: #fffdf7;
  --ink: #17231d;
  --ink-soft: #46564c;        /* 7.9:1 on paper */
  --sea: #006d76;
  --sea-dark: #004c54;        /* 8.6:1 on paper */
  --sea-pale: #d9ebe6;
  --terra: #974122;           /* 5.9:1 on paper */
  --terra-pale: #f1ddd4;
  --serif: Charter, "Bitstream Charter", Georgia, serif;
  --sans: "Liberation Sans", "DejaVu Sans", Arial, sans-serif;
  --mono: "Liberation Mono", "DejaVu Sans Mono", monospace;
  --shadow: 0.35rem 0.35rem 0 rgba(23, 35, 29, 0.16);

  /* base flow.css tokens re-pointed at the atlas palette (also wins over the base dark media block) */
  --fg: var(--ink);
  --bg: var(--paper);
  --muted: var(--ink-soft);
  --line: #65756a;            /* 4.6:1 non-text on paper */
  --line-soft: #b7b9aa;
  --surface: var(--paper-light);
  --accent: var(--sea-dark);
  --accent-fg: #fffefa;
  --link: var(--sea-dark);
  --notice-bg: var(--terra-pale);
  --notice-fg: var(--ink);
  --notice-line: var(--terra);
  --error: #7a1e24;           /* 8.7:1 on paper */
  --error-bg: #f6dfdc;
  --ok: #1e5e2a;
  --focus: #a83e00;           /* 5.6:1 on paper */
  --zebra: var(--paper-deep);
}

/* ---------- material: warm paper with a faint coordinate grid (illustrative, decorative) ---------- */
body {
  font-family: var(--sans);
  line-height: 1.6;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(23, 35, 29, 0.035) 1px, transparent 1px) 0 0 / 5rem 5rem,
    linear-gradient(rgba(23, 35, 29, 0.025) 1px, transparent 1px) 0 0 / 5rem 5rem,
    var(--paper);
}
a { color: var(--sea-dark); text-decoration-thickness: 0.12em; text-underline-offset: 0.2em; }
:focus-visible, [tabindex="-1"]:focus { outline: 3px solid var(--focus); outline-offset: 3px; }
main:focus { outline: none; }

/* ---------- header chrome ---------- */
.site-header { background: rgba(244, 240, 228, 0.98); border-bottom: 1px solid var(--line); }
.demo-notice {
  border-block: 0;
  border-left: 0.6rem solid var(--terra);
  border-bottom: 2px solid var(--terra);
  font-family: var(--sans);
}
.masthead.persona-chrome {
  display: grid;
  grid-template-columns: minmax(12rem, 0.7fr) minmax(16rem, 1.3fr);
  align-items: center;
  gap: 0.75rem 1.5rem;
  padding: 1rem 1rem 0.5rem;
}
.masthead.persona-chrome > .masthead { padding: 0; }
.brand-lockup { display: flex; align-items: baseline; flex-wrap: wrap; gap: 0.35rem 0.85rem; min-width: 0; }
.brand, .brand-name {
  font-family: var(--serif);
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.035em;
}
.brand-context {
  max-width: 14rem;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 0.875rem;
  line-height: 1.35;
}
.persona-nav-list.flow-nav-list {
  justify-content: flex-end;
  gap: 0.3rem 0.5rem;
  margin: 0;
  border-bottom: 0;
}
.persona-nav-list a {
  padding: 0.45rem 0.5rem;
  color: var(--ink);
  font-size: 0.9375rem;
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid transparent;
}
.persona-nav-list a:hover { border-bottom-color: var(--sea); }
@media (max-width: 767px) {
  .masthead.persona-chrome { grid-template-columns: minmax(0, 1fr); }
  .persona-nav-list.flow-nav-list { justify-content: flex-start; }
  .brand-context { max-width: none; }
}

/* flow nav as a coordinate rule: mono, letterspaced, current step marked with a route square */
.flow-nav .flow-nav-list {
  border-bottom: 2px solid var(--ink);
  gap: 0 1.5rem;
  margin-top: 0.5rem;
  font-family: var(--mono);
  font-size: 0.875rem;
  letter-spacing: 0.06em;
}
.flow-nav-current { color: var(--sea-dark); }
.flow-nav-current::before {
  content: "";
  display: inline-block;
  width: 0.7rem;
  height: 0.7rem;
  margin-right: 0.5rem;
  background: var(--sea-dark);
  border: 2px solid var(--ink);
}

/* ---------- type: editorial place-setting, coordinate rules over headings ---------- */
h1.page-heading {
  font-family: var(--serif);
  font-size: clamp(1.75rem, 3.5vw, 2.4rem);
  letter-spacing: -0.02em;
  margin-top: 1.25rem;
  padding-top: 0.75rem;
  border-top: 2px solid var(--ink);
  max-width: 34ch;
}
h2 {
  font-family: var(--serif);
  font-size: 1.5rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line);
}
h3, .product-name { font-family: var(--serif); }
.pricing-basis, .lead-time-note, .catalog-assumption, .field-hint, .quote-intro, .email-preview-intro,
.catalog-filter-status { color: var(--ink-soft); }
.marker-illustrative { font-family: var(--mono); font-style: normal; font-size: 1rem; letter-spacing: 0.02em; }

/* keyed callouts: posture / expired / precondition boxes as legend plates */
[data-content-id="commerce.posture-note"], .quote-expired-note, .flow-expired {
  border-left: 0.6rem solid var(--terra);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper-light);
}
.flow-precondition, .flow-load-error, .form-errors, .quote-locked-state, [data-content-id="quote.locked.state"],
.account-state, [data-content-id="account.state"], .demo-status:not(:empty), .margin-panel {
  border-radius: 0;
}
[data-content-id="confirmation.disclaimer"] { border-left: 0.6rem solid var(--terra); background: var(--paper-light); }
.demo-status:not(:empty) { border-left: 0.6rem solid var(--sea-dark); background: var(--sea-pale); }

/* ---------- controls: square route-marker geometry, hard offset shadow ---------- */
button, .cta-primary, .cta-secondary, .filter-button, .clear-demo, a.cta-primary, a.cta-secondary {
  border-radius: 0;
  border: 2px solid var(--ink);
  color: var(--ink);
  background: var(--paper-light);
  box-shadow: var(--shadow);
  transition: none;
}
button:hover, .cta-secondary:hover, .filter-button:hover, .clear-demo:hover { background: var(--sea-pale); }
.cta-primary, button.cta-primary, a.cta-primary, [type="submit"] {
  background: var(--sea-dark);
  color: var(--accent-fg);
  border-color: var(--ink);
  box-shadow: 0.35rem 0.35rem 0 var(--terra);
}
.cta-primary:hover, [type="submit"]:hover { filter: none; background: var(--sea); }
.filter-button[aria-pressed="true"] { background: var(--sea-dark); color: var(--accent-fg); }
input, select, textarea { border-radius: 0; border: 2px solid var(--ink); background: var(--paper-light); }
input[aria-invalid="true"], select[aria-invalid="true"] { border-color: var(--error); box-shadow: inset 0.35rem 0 0 var(--error); }

/* ---------- catalog: legend key (filters) + numbered route stops ---------- */
.catalog-filter {
  padding: 0.75rem 0;
  border-block: 1px solid var(--line);
  gap: 0.5rem 0.6rem;
}
.catalog-filter-label {
  font-family: var(--mono);
  font-size: 0.875rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}
.filter-button { box-shadow: none; font-size: 0.9375rem; padding-inline: 0.85rem; }
.filter-button[aria-pressed="true"] { box-shadow: 0.25rem 0.25rem 0 var(--terra); }
.product-list-heading { font-family: var(--mono); font-size: 0.875rem; letter-spacing: 0.13em; text-transform: uppercase; border-top: 0; }

[data-skin-catalog="stops"] .product-list {
  display: block;
  counter-reset: stop;
  margin: 1rem 0 0;
  padding-left: 0;
  border-left: 0;
}
[data-skin-catalog="stops"] .product-card {
  counter-increment: stop;
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(12rem, 1fr);
  grid-template-areas: "title price" "spec spec" "meta meta";
  gap: 0.25rem 1.5rem;
  margin: 0 0 1.5rem 3.4rem;
  padding: 0.85rem 1rem 1rem;
  border: 2px solid var(--ink);
  border-radius: 0;
  background: var(--paper-light);
  box-shadow: var(--shadow);
}
/* route stop number: a keyed marker on the rule (decorative — alt "" keeps AT silent) */
[data-skin-catalog="stops"] .product-card::before {
  content: counter(stop, decimal-leading-zero) / "";
  position: absolute;
  left: -3.4rem;
  top: 0.85rem;
  display: grid;
  width: 2.4rem;
  height: 2.4rem;
  place-items: center;
  border: 2px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-weight: 700;
  line-height: 1;
}
/* the dotted route line linking stops (illustrative) */
[data-skin-catalog="stops"] .product-card::after {
  content: "";
  position: absolute;
  left: -2.25rem;
  top: 3.25rem;
  bottom: -1.5rem;
  border-left: 3px dashed var(--sea-dark);
}
[data-skin-catalog="stops"] .product-card:last-child::after { display: none; }
[data-skin-catalog="stops"] .product-card > .product-name { grid-area: title; font-size: 1.25rem; margin: 0; }
[data-skin-catalog="stops"] .product-card > .product-spec { grid-area: spec; margin: 0; color: var(--ink-soft); }
[data-skin-catalog="stops"] .product-card > .product-meta {
  grid-area: meta;
  grid-template-columns: max-content 1fr;
  gap: 0.15rem 1rem;
  margin: 0.4rem 0 0;
  padding-top: 0.5rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.9375rem;
}
[data-skin-catalog="stops"] .product-card > .product-meta dt {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--sea-dark);
}
[data-skin-catalog="stops"] .product-card > .product-from-price {
  grid-area: price;
  justify-self: end;
  align-self: start;
  margin: 0;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--line);
  background: var(--paper);
  font-variant-numeric: tabular-nums;
  text-align: right;
}
.product-from-price-missing { font-weight: 400; }
@media (max-width: 767px) {
  [data-skin-catalog="stops"] .product-card { grid-template-columns: 1fr; grid-template-areas: "title" "spec" "price" "meta"; margin-left: 3rem; }
  [data-skin-catalog="stops"] .product-card::before { left: -3rem; width: 2.2rem; height: 2.2rem; }
  [data-skin-catalog="stops"] .product-card::after { left: -1.95rem; }
  [data-skin-catalog="stops"] .product-card > .product-from-price { justify-self: start; text-align: left; }
  [data-skin-catalog="stops"] .product-card > .product-meta { grid-template-columns: 1fr; }
}
@media (max-width: 400px) {
  [data-skin-catalog="stops"] .product-card { margin-left: 2.6rem; padding-inline: 0.75rem; }
  [data-skin-catalog="stops"] .product-card::before { left: -2.6rem; width: 2rem; height: 2rem; font-size: 0.75rem; }
  [data-skin-catalog="stops"] .product-card::after { left: -1.7rem; }
}

/* ---------- product page: stop plate ---------- */
.product-spec-sheet, .provenance, .order-summary, .margin-panel-values {
  border: 2px solid var(--ink);
  border-radius: 0;
  background: var(--paper-light);
  box-shadow: var(--shadow);
  padding: 1rem 1.15rem;
}
.product-spec-sheet dt, .provenance dt, .order-summary dt {
  color: var(--sea-dark);
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
}
.unit-price-line {
  font-family: var(--serif);
  font-size: 1.5rem;
  padding: 0.5rem 0.75rem;
  border-left: 0.6rem solid var(--sea-dark);
  background: var(--paper-light);
}

/* ---------- quote breakdown: keyed price plate ---------- */
[data-skin-breakdown="plate"] .breakdown {
  border: 2px solid var(--ink);
  background: var(--paper-light);
  box-shadow: var(--shadow);
}
[data-skin-breakdown="plate"] .breakdown caption {
  font-family: var(--mono);
  font-size: 0.875rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--sea-dark);
  padding: 0.6rem 0.75rem;
  border-top: 2px solid var(--ink);
  border-inline: 2px solid var(--ink);
  background: var(--paper);
}
[data-skin-breakdown="plate"] .breakdown th, [data-skin-breakdown="plate"] .breakdown td {
  border: 0;
  border-bottom: 1px solid var(--line-soft);
}
[data-skin-breakdown="plate"] .breakdown thead th {
  background: var(--paper-deep);
  border-bottom: 2px solid var(--ink);
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
[data-skin-breakdown="plate"] .breakdown tbody tr:nth-child(even) td,
[data-skin-breakdown="plate"] .breakdown tbody tr:nth-child(even) th { background: transparent; }
/* legend key: every row header carries a keyed square; the total row carries the filled sea square */
[data-skin-breakdown="plate"] .breakdown th[scope="row"] { padding-left: 2rem; position: relative; }
[data-skin-breakdown="plate"] .breakdown th[scope="row"]::before {
  content: "";
  position: absolute;
  left: 0.75rem;
  top: 0.95rem;
  width: 0.65rem;
  height: 0.65rem;
  border: 2px solid var(--ink);
  background: var(--paper);
}
[data-skin-breakdown="plate"] .breakdown-total th, [data-skin-breakdown="plate"] .breakdown-total td {
  border-top: 2px solid var(--ink);
  background: var(--sea-pale) !important;
  font-family: var(--serif);
  font-size: 1.125rem;
}
[data-skin-breakdown="plate"] .breakdown-total th[scope="row"]::before { background: var(--sea-dark); }
[data-skin-breakdown="plate"] .breakdown td:last-child { font-family: var(--mono); font-size: 1rem; }
@media (max-width: 767px) {
  [data-skin-breakdown="plate"] .breakdown { border: 0; box-shadow: none; background: transparent; }
  [data-skin-breakdown="plate"] .breakdown caption { border: 2px solid var(--ink); margin-bottom: 0.75rem; }
  [data-skin-breakdown="plate"] .breakdown tr { border: 2px solid var(--ink); border-radius: 0; background: var(--paper-light); box-shadow: var(--shadow); }
  [data-skin-breakdown="plate"] .breakdown th[scope="row"] { background: var(--paper-deep) !important; }
  [data-skin-breakdown="plate"] .breakdown-total { border-width: 2px; }
}
.quote-actions { padding-top: 0.5rem; border-top: 1px solid var(--line); }
.margin-panel { border: 2px dashed var(--sea-dark); background: var(--paper-light); }

/* ---------- forms: chart-margin layout (label column on a coordinate rule) ---------- */
form { padding-left: 1rem; border-left: 2px solid var(--line); }
.field { margin: 1.25rem 0; }
.field label {
  font-family: var(--mono);
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  color: var(--sea-dark);
  margin-bottom: 0.4rem;
}
.form-required-note, [data-content-id="form.all-required"] { font-family: var(--mono); font-size: 0.875rem; }
.field-error { border-left: 0.6rem solid var(--error); padding-left: 0.5rem; }
@media (min-width: 768px) {
  .field { display: grid; grid-template-columns: minmax(10rem, 14rem) minmax(0, 1fr); column-gap: 1.25rem; align-items: start; }
  .field label { grid-column: 1; padding-top: 0.6rem; margin-bottom: 0; }
  .field .field-hint, .field input, .field select, .field textarea, .field .field-error { grid-column: 2; }
  .field .field-hint { margin-top: 0; }
}

/* ---------- confirmation / email preview ---------- */
.order-line { font-family: var(--serif); font-size: 1.35rem; }
.email-envelope, .email-body { border-radius: 0; border: 2px solid var(--ink); background: var(--paper-light); }
.email-envelope { border-bottom: 1px solid var(--line-soft); background: var(--paper-deep); }
.email-body { box-shadow: var(--shadow); margin-bottom: 1.5rem; }

/* ---------- footer ---------- */
.site-footer { border-top: 2px solid var(--ink); }
.footer-disclaimer { font-family: var(--mono); font-size: 0.9375rem; }
.clear-demo { box-shadow: none; }

/* ---------- motion / forced colours ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}
@media (forced-colors: active) {
  .product-card, .breakdown, .demo-notice { border: 2px solid CanvasText; box-shadow: none; }
  [data-skin-catalog="stops"] .product-card::before { border-color: CanvasText; }
}