/* Black Path Labs, www.blackpathlabs.com.
   One stylesheet, no build step, no JS, no external requests.
   Fonts are self-hosted (SIL OFL): Literata for headings, Chivo for body.

   Three layouts, reused on every page:
     A  .split   text 7 / figure 5 (heroes, callouts)
     B  .rows    title 4 / body 8 (every list of services, steps, team)
     C  .prose   one reading column, optional sticky TOC (contact, legal, 404)
   .section--ink puts any of them on the dark surface. */

@font-face {
  font-family: "Literata";
  font-style: normal;
  font-weight: 400 500;
  font-display: swap;
  src: url("/fonts/literata-var-latin.woff2") format("woff2");
}
@font-face {
  font-family: "Chivo";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("/fonts/chivo-var-latin.woff2") format("woff2");
}
/* Metric-matched fallbacks so the swap to the web fonts does not move text. */
@font-face {
  font-family: "Literata Fallback";
  src: local("Georgia");
  size-adjust: 104%;
  ascent-override: 92%;
  descent-override: 26%;
}
@font-face {
  font-family: "Chivo Fallback";
  src: local("Arial");
  size-adjust: 103%;
  ascent-override: 92%;
  descent-override: 24%;
}

/* ============ Tokens ============ */

:root {
  --color-paper:     #F4EFE6;   /* page background */
  --color-ink:       #2B2724;   /* text, dark band background */
  --color-hairline:  #8C857B;   /* rules only, never text (3.19:1) */
  --color-muted:     #6B655C;   /* small muted text, 5.04:1 */
  --color-soft:      #48433E;   /* secondary text, 8.54:1 */
  --color-on-ink:    #DFDAD1;   /* body text on ink, 10.64:1 */
  --color-blue:      #38B6FF;   /* the path line, and accents on ink */
  --color-blue-ink:  #0A5F91;   /* focus, selection, accents on paper (5.99:1) */
  --paper: var(--color-paper);  /* legacy aliases */
  --ink: var(--color-ink);

  --font-heading: "Literata", "Literata Fallback", Georgia, serif;
  --font-body:    "Chivo", "Chivo Fallback", system-ui, -apple-system, "Segoe UI", Arial, sans-serif;

  /* Type scale, ratio 1.25 on a 17px body */
  --text-display: clamp(2.5rem, 5vw + 1rem, 4rem);         /* 40 -> 64 */
  --text-h2:      clamp(1.75rem, 2.5vw + .75rem, 2.5rem);  /* 28 -> 40 */
  --text-h3:      clamp(1.25rem, 1vw + 1rem, 1.5625rem);   /* 20 -> 25 */
  --text-lead:    1.25rem;                                 /* 20 */
  --text-body:    1.0625rem;                               /* 17 */
  --text-small:   .875rem;                                 /* 14 */
  --text-label:   .8125rem;                                /* 13, uppercase nav + one eyebrow */

  /* Spacing, 8-point */
  --space-1: .25rem;   /*  4 */
  --space-2: .5rem;    /*  8 */
  --space-3: .75rem;   /* 12 */
  --space-4: 1rem;     /* 16 */
  --space-5: 1.5rem;   /* 24 */
  --space-6: 2rem;     /* 32 */
  --space-7: 3rem;     /* 48 */
  --space-8: 4rem;     /* 64 */
  --space-9: 6rem;     /* 96 */
  --section-y: clamp(3.5rem, 6vw + 1rem, 6rem);           /* 56 -> 96 */

  --container: min(1200px, 100% - 2 * var(--space-5));
  --measure: 65ch;
  --measure-lead: 48ch;
  --measure-legal: 70ch;
  --header-h: 72px;
}

/* ============ Reset / base ============ */

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + var(--space-4));
}

body {
  background-color: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-optical-sizing: auto;
  color: var(--color-ink);
  text-wrap: balance;
}
h1 { font-size: var(--text-display); font-weight: 500; line-height: 1.05; letter-spacing: -.025em; max-width: 18ch; }
h2 { font-size: var(--text-h2); font-weight: 400; line-height: 1.15; letter-spacing: -.01em; }
h3 { font-size: var(--text-h3); font-weight: 500; line-height: 1.25; }

p { max-width: var(--measure); margin-block-end: var(--space-4); }
p:last-child { margin-block-end: 0; }
strong { font-weight: 700; }

a {
  color: var(--color-ink);
  text-decoration-color: var(--color-hairline);
  text-underline-offset: 4px;
  transition: text-decoration-color .15s, color .15s, background-color .15s;
}
a:hover { text-decoration-color: var(--color-ink); }
:focus-visible { outline: 2px solid var(--color-blue-ink); outline-offset: 3px; border-radius: 2px; }
.section--ink :focus-visible { outline-color: var(--color-blue); }

img, picture, svg { display: block; max-width: 100%; }

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

.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

.skip-link {
  position: absolute; left: var(--space-4); top: -100px; z-index: 200;
  background: var(--color-ink); color: var(--color-paper);
  padding: var(--space-3) var(--space-4); text-decoration: none;
}
.skip-link:focus { top: var(--space-4); }

/* ============ Layout primitives ============ */

.container { width: var(--container); margin-inline: auto; }

.section { padding-block: var(--section-y); }
.section > .container > * + .rows,
.section > .container > * + .prose { margin-block-start: var(--space-7); }

.section--ink { background-color: var(--color-ink); color: var(--color-on-ink); }
.section--ink h1, .section--ink h2, .section--ink h3 { color: var(--color-paper); }
.section--ink a { color: var(--color-paper); text-decoration-color: rgba(244, 239, 230, .45); }
.section--ink a:hover { text-decoration-color: var(--color-paper); }
.section--ink .lead, .section--ink p { color: var(--color-on-ink); }

/* No rule between sections: rhythm comes from paper and ink surfaces, and a
   .rows list already closes with its own hairline. */

.eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-label);
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-block-end: var(--space-4);
}
.section--ink .eyebrow { color: var(--color-blue); }

.section__title { margin-block-end: var(--space-4); max-width: 24ch; }
.lead, .lede {
  font-size: var(--text-lead);
  line-height: 1.5;
  color: var(--color-ink);
  max-width: var(--measure-lead);
  margin-block-end: var(--space-4);
}
.lead + .lead { color: var(--color-soft); font-size: var(--text-body); line-height: 1.65; max-width: var(--measure); }

.meta {
  font-size: var(--text-small);
  color: var(--color-muted);
  margin-block-end: var(--space-6);
}

/* ============ Buttons and arrow links ============ */

.arrow, .cta-arrow { width: 20px; height: 8px; flex-shrink: 0; transition: transform .2s; }

.btn, .btn-wrap a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 48px;
  padding: 14px 22px;
  background-color: var(--color-ink);
  color: var(--color-paper);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.2;
  text-decoration: none;
  border-radius: 2px;
}
.btn:hover, .btn-wrap a:hover { background-color: #000; color: var(--color-paper); }
.btn:hover .arrow { transform: translateX(4px); }
.section--ink .btn, .section--ink .btn-wrap a, .btn--on-ink { background-color: var(--color-paper); color: var(--color-ink); }
.section--ink .btn:hover, .section--ink .btn-wrap a:hover, .btn--on-ink:hover { background-color: #fff; color: var(--color-ink); }
.btn-wrap { margin-block: var(--space-5) var(--space-6); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: var(--color-hairline);
  text-underline-offset: 4px;
}
.link-arrow:hover { text-decoration-color: currentColor; }
.link-arrow:hover .arrow { transform: translateX(4px); }

/* ============ Header / nav ============ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-paper);
  border-bottom: 1px solid rgba(140, 133, 123, .45);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  min-height: var(--header-h);
}
.logo-link { display: flex; align-items: center; gap: var(--space-3); text-decoration: none; flex-shrink: 0; color: var(--color-ink); min-height: 44px; }
.logo-link .mark { width: 32px; height: 32px; }
.logo-word { font-family: var(--font-heading); font-size: 1.25rem; font-weight: 500; letter-spacing: -.01em; }

.nav-list { display: flex; align-items: center; gap: var(--space-5); list-style: none; }
.nav-link {
  display: inline-block;
  padding-block: var(--space-3);
  font-family: var(--font-body);
  font-size: var(--text-label);
  font-weight: 500;
  letter-spacing: .06em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--color-soft);
  border-bottom: 2px solid transparent;
}
.nav-link:hover { color: var(--color-ink); }
.nav-link[aria-current="page"] { color: var(--color-ink); border-bottom-color: var(--color-blue-ink); }
.nav-cta {
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-ink);
  border-radius: 2px;
  color: var(--color-ink);
}
.nav-cta:hover { background-color: var(--color-ink); color: var(--color-paper); }
.nav-cta[aria-current="page"] { background-color: var(--color-ink); color: var(--color-paper); border-bottom-color: var(--color-ink); }

/* Mobile menu: <details>, no script (the CSP allows none). */
.nav-menu { display: none; position: relative; }
.nav-menu > summary {
  list-style: none;
  cursor: pointer;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding-inline: var(--space-4);
  border: 1px solid var(--color-ink);
  border-radius: 2px;
  font-size: var(--text-label);
  font-weight: 500;
  letter-spacing: .06em;
  text-transform: uppercase;
}
.nav-menu > summary::-webkit-details-marker { display: none; }
.nav-menu[open] > summary { background-color: var(--color-ink); color: var(--color-paper); }
.nav-menu__list {
  position: absolute;
  right: 0;
  top: calc(100% + var(--space-2));
  min-width: 15rem;
  list-style: none;
  background-color: var(--color-paper);
  border: 1px solid var(--color-hairline);
  padding: var(--space-2) var(--space-4);
  box-shadow: 0 12px 24px rgba(43, 39, 36, .12);
}
.nav-menu__list .nav-link { display: block; padding-block: var(--space-3); border-bottom: 0; }
.nav-menu__list li + li { border-top: 1px solid rgba(140, 133, 123, .35); }
.nav-menu__list .nav-link[aria-current="page"] { color: var(--color-blue-ink); }

@media (max-width: 1180px) {
  .site-nav { display: none; }
  .nav-menu { display: block; }
  :root { --header-h: 64px; }
}

/* ============ A. Split ============ */

.split__inner {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: var(--space-8);
  align-items: center;
}
.split__inner:not(:has(.split__fig)) { grid-template-columns: minmax(0, 1fr); }
.split__text > * + .btn,
.split__text > * + .link-arrow { margin-block-start: var(--space-5); }
.split__fig { margin: 0; }
.figure-wide { margin: 0 0 var(--space-7); }
.container > .figure-wide:last-child { margin: var(--space-7) 0 0; }
.figure-wide img {
  width: 100%;
  height: auto;
  aspect-ratio: 21 / 9;
  object-fit: cover;
  border-radius: 2px;
  background-color: #e9e3d8;
}
/* Diagrams keep their full frame: no crop, links to the full-size file. */
.figure-diagram { margin: 0; }
.figure-diagram img {
  width: 100%;
  height: auto;
  border-radius: 2px;
  background-color: #111;
}
.figure-diagram figcaption {
  max-width: var(--measure);
  margin-block-start: var(--space-4);
  font-size: var(--text-small);
  color: var(--color-muted);
}
.split__fig img {
  width: 100%;
  height: auto;
  border-radius: 2px;
  background-color: #e9e3d8;
}
@media (max-width: 900px) {
  .split__inner { grid-template-columns: minmax(0, 1fr); gap: var(--space-7); }
}

/* Hero: the blue path runs under the full split. */
.hero { position: relative; padding-block-end: calc(var(--section-y) + 24px); }
.hero::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: var(--space-6);
  height: 24px;
  background:
    linear-gradient(var(--color-blue), var(--color-blue)) left 23px / 30% 2px no-repeat,
    linear-gradient(var(--color-blue), var(--color-blue)) 30% 0 / 2px 24px no-repeat,
    linear-gradient(var(--color-blue), var(--color-blue)) right 0 / 70% 2px no-repeat;
  opacity: .9;
  pointer-events: none;
}
.hero h1, .hero-headline { margin-block-end: var(--space-5); }
.hero .lead:first-of-type { margin-block-end: var(--space-4); }

.page-status {
  margin-block-start: var(--space-5);
  font-size: var(--text-small);
  font-weight: 500;
  color: var(--color-ink);
  padding-left: var(--space-3);
  border-left: 2px solid var(--color-blue-ink);
  max-width: none;
}

/* ============ Credibility strip ============ */

.cred-strip { border-bottom: 1px solid rgba(140, 133, 123, .45); padding-block: var(--space-5); }
.cred-list {
  list-style: none;
  display: flex; flex-wrap: wrap; row-gap: var(--space-2);
  font-size: var(--text-small); color: var(--color-soft);
}
.cred-list li { white-space: nowrap; }
.cred-list li:not(:last-child)::after { content: "\00B7"; margin-inline: .75em; color: var(--color-hairline); }
.cred-list li.cred-lead { font-weight: 600; color: var(--color-ink); }
.cred-list li.cred-lead::after { content: ":"; margin-inline: 0 .75em; color: inherit; }
@media (max-width: 640px) {
  .cred-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2) var(--space-4); }
  .cred-list li { white-space: normal; }
  .cred-list li.cred-lead { grid-column: 1 / -1; }
  .cred-list li::after, .cred-list li:not(:last-child)::after, .cred-list li.cred-lead::after { content: none; }
}

/* ============ B. Rows ============ */

.rows { list-style: none; border-bottom: 1px solid rgba(140, 133, 123, .45); }
.row {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: var(--space-3) var(--space-6);
  padding-block: var(--space-6);
  border-top: 1px solid rgba(140, 133, 123, .45);
}
.row__title { font-size: var(--text-h3); max-width: 20ch; }
.row__meta {
  display: block;
  margin-block-start: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-small);
  font-weight: 400;
  color: var(--color-muted);
}
.row__body > p { color: var(--color-soft); margin-block-end: var(--space-3); }
.row__body > p.row__problem,
.row__problem { color: var(--color-ink); font-weight: 500; }
.row__body > .link-arrow { margin-block-start: var(--space-1); }
.row__body ul, .row__body ol { padding-left: 1.25rem; color: var(--color-soft); margin-block-end: var(--space-3); }
.row__body li { margin-block-end: var(--space-1); max-width: var(--measure); }
.section--ink .rows, .section--ink .row { border-color: rgba(223, 218, 209, .25); }
.section--ink .row__body > p { color: var(--color-on-ink); }
.section--ink .row__problem { color: var(--color-paper); }

/* Numbered steps */
.rows--steps { counter-reset: step; }
.rows--steps > .row { counter-increment: step; }
.rows--steps .row__title::before {
  content: counter(step, decimal-leading-zero);
  display: block;
  margin-block-end: var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-h2);
  font-weight: 400;
  line-height: 1;
  color: var(--color-blue-ink);
}

@media (max-width: 720px) {
  .row { grid-template-columns: minmax(0, 1fr); padding-block: var(--space-5); }
}

/* Team rows reuse .rows; legacy hooks kept for safety. */
.team-role { font-weight: 500; }
.team-bio { color: var(--color-soft); }

/* ============ C. Prose and legal ============ */

.prose { max-width: var(--measure-legal); }
.prose > * { max-width: var(--measure-legal); }
.prose h1 { margin-block-end: var(--space-4); }
.prose h2 {
  margin-block: var(--space-7) var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(140, 133, 123, .45);
  font-size: clamp(1.5rem, 1.5vw + 1rem, 2rem);
  scroll-margin-top: calc(var(--header-h) + var(--space-4));
}
.prose h3 { margin-block: var(--space-6) var(--space-3); }
.prose ul, .prose ol { padding-left: 1.4rem; margin-block-end: var(--space-4); }
.prose li { margin-block-end: var(--space-2); }
.prose li::marker { color: var(--color-muted); }

.legal-layout { display: block; }
.toc { font-size: var(--text-small); margin-block-end: var(--space-7); }
.toc__title {
  font-weight: 600;
  color: var(--color-ink);
  margin-block-end: var(--space-2);
}
.toc ul { list-style: none; border-left: 1px solid rgba(140, 133, 123, .45); }
.toc li { margin: 0; }
.toc a {
  display: block;
  padding: 6px 0 6px var(--space-4);
  min-height: 24px;
  color: var(--color-soft);
  text-decoration: none;
  line-height: 1.4;
}
.toc a:hover { color: var(--color-ink); text-decoration: underline; }
@media (max-width: 1023px) {
  /* Compact jump list above the text instead of a tall column of links. */
  .toc { margin-block-end: var(--space-6); padding-block-end: var(--space-5); border-bottom: 1px solid rgba(140, 133, 123, .45); }
  .toc ul { display: flex; flex-wrap: wrap; gap: 0 var(--space-4); border-left: 0; }
  .toc a { padding: 4px 0; min-height: 24px; text-decoration: underline; text-decoration-color: var(--color-hairline); }
}
@media (max-width: 720px) {
  .prose h2 { margin-block: var(--space-6) var(--space-3); padding-top: var(--space-5); }
  .prose h3 { margin-block: var(--space-5) var(--space-2); }
  .hero { padding-block-start: var(--space-6); }
  .row__body > .link-arrow { min-height: 32px; }
}
@media (min-width: 1024px) {
  .legal-layout {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: var(--space-8);
    align-items: start;
  }
  .toc {
    position: sticky;
    top: calc(var(--header-h) + var(--space-6));
    max-height: calc(100vh - var(--header-h) - var(--space-8));
    overflow-y: auto;
    margin: 0;
  }
}

.panel {
  border: 1px solid rgba(140, 133, 123, .6);
  border-left: 3px solid var(--color-blue-ink);
  background-color: rgba(255, 255, 255, .35);
  padding: var(--space-5) var(--space-5);
  margin-block: var(--space-5);
}
.panel > :last-child { margin-bottom: 0; }
.consent { font-size: .9375rem; line-height: 1.7; }
.tel { font-variant-numeric: tabular-nums; white-space: nowrap; }

dl.facts { margin-block-end: var(--space-4); }
dl.facts dt { font-weight: 700; margin-top: .875rem; }
dl.facts dd { margin-top: 2px; color: var(--color-soft); }

hr { border: 0; border-top: 1px solid var(--color-hairline); margin-block: var(--space-6); }

table {
  border-collapse: collapse;
  width: 100%;
  max-width: var(--measure);
  margin-block: var(--space-4) var(--space-6);
  font-size: var(--text-small);
}
th, td { text-align: left; padding: var(--space-3) var(--space-4) var(--space-3) 0; border-bottom: 1px solid rgba(140, 133, 123, .6); vertical-align: top; }
th { font-weight: 600; color: var(--color-ink); }
td.tel { width: 11em; }

.link-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 var(--space-6);
  margin-block: var(--space-5);
}
.link-grid a { display: block; padding-block: var(--space-2); min-height: 24px; }
@media (max-width: 520px) { .link-grid { grid-template-columns: minmax(0, 1fr); } }

/* ============ Footer ============ */

.site-footer {
  border-top: 1px solid rgba(140, 133, 123, .45);
  padding-block: var(--space-8);
  font-size: var(--text-small);
  color: var(--color-muted);
}
.section--ink + .site-footer, main:has(> .section--ink:last-child) + .site-footer { border-top: 0; }
.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: var(--space-6) var(--space-8);
  align-items: start;
}
.footer-name {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-ink);
  margin-block-end: var(--space-2);
  min-height: 44px;
}
.footer-name .mark { width: 26px; height: 26px; }
.footer-tagline { color: var(--color-muted); margin: 0; }
.footer-nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 var(--space-6); }
.footer-links { list-style: none; }
.footer-links a {
  display: inline-block;
  padding-block: 10px;
  min-height: 24px;
  color: var(--color-soft);
  text-decoration: none;
  line-height: 1.3;
}
.footer-links a:hover { color: var(--color-ink); text-decoration: underline; }
.footer-meta { grid-column: 1 / -1; padding-top: var(--space-5); border-top: 1px solid rgba(140, 133, 123, .35); }
.footer-meta p { margin-block-end: var(--space-1); max-width: none; }
.footer-meta a { color: var(--color-soft); display: inline-block; padding-block: 2px; }
@media (max-width: 720px) {
  .footer-inner { grid-template-columns: minmax(0, 1fr); gap: var(--space-5); }
  .site-footer { padding-block: var(--space-7); }
}

/* ============ Brand mark ============ */

.mark { display: block; width: 34px; height: 34px; flex: none; }
.mark .plate  { fill: var(--color-paper); }
.mark .seg    { stroke: var(--color-ink); }
.mark .seg-hi { stroke: var(--color-blue); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}