/* praccept.com — site stylesheet.
   Tokens and component classes come from the Industry design system
   (_ds/industry-*/styles.css, the source of truth); page layout follows
   Website.dc.html. Fonts are self-hosted. */

@font-face {
  font-family: "Barlow";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/barlow-400.woff2") format("woff2");
}
@font-face {
  font-family: "Barlow";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("../fonts/barlow-500.woff2") format("woff2");
}
@font-face {
  font-family: "Barlow Condensed";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("../fonts/barlow-condensed-600.woff2") format("woff2");
}

:root {
  --color-bg: #f2f2f3;
  --color-surface: #e9e9ea;
  --color-text: #1d1f20;
  --color-accent: #5980a6;
  --color-divider: color-mix(in srgb, #1d1f20 16%, transparent);

  --color-neutral-200: #e7e7ea;
  --color-neutral-700: #5d5d60;
  --color-neutral-800: #424244;
  --color-neutral-900: #2b2b2d;

  --color-accent-300: #b5d9fd;
  --color-accent-400: #94bce3;
  --color-accent-600: #597ea3;
  --color-accent-700: #416180;
  --color-accent-800: #2c455d;
  --color-accent-900: #1d2d3d;

  --font-heading: "Barlow Condensed", system-ui, sans-serif;
  --font-heading-weight: 600;
  --font-body: "Barlow", system-ui, sans-serif;

  --space-1: 3.4px;
  --space-2: 6.8px;
  --space-3: 10.2px;

  --shadow-md: 0 3px 10px color-mix(in srgb, #2b2b2d 16%, transparent);

  --content-max: 1200px;
  --gutter: clamp(20px, 4vw, 48px);
}

/* ── base ─────────────────────────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  font-weight: 400;
}
h1, h2, h3, h4 {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  line-height: 1.12; letter-spacing: -0.015em; margin: 0;
}
h1 { font-size: 42px; }
h2 { font-size: 32px; }
h3 { font-size: 25px; }
p { margin: 0; }
a { color: var(--color-accent-700); text-underline-offset: 3px; }
a:hover { color: var(--color-accent-900); }
img, svg { display: block; max-width: 100%; }
:focus { outline: none; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
::selection { background: color-mix(in srgb, var(--color-accent) 30%, transparent); }

[hidden] { display: none !important; }
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: var(--gutter); top: -100px; z-index: 10;
  padding: 8px 14px; background: var(--color-text); color: var(--color-bg);
  font-size: 14px; text-decoration: none;
}
.skip-link:focus { top: 8px; color: var(--color-bg); }

/* ── blueprint frame ──────────────────────────────────────────────────── */

.blueprint {
  position: relative;
  border: 1px solid var(--color-divider);
  border-radius: 0;
}
.blueprint > .corner {
  position: absolute; width: 11px; height: 11px;
  color: color-mix(in srgb, var(--color-text) 55%, transparent);
  pointer-events: none;
}
.blueprint > .corner::before, .blueprint > .corner::after {
  content: ""; position: absolute; background: currentColor;
}
.blueprint > .corner::before { left: 5px; top: 0; width: 1px; height: 100%; }
.blueprint > .corner::after  { top: 5px; left: 0; width: 100%; height: 1px; }
.blueprint > .corner.tl { top: -6px; left: -6px; }
.blueprint > .corner.tr { top: -6px; right: -6px; }
.blueprint > .corner.bl { bottom: -6px; left: -6px; }
.blueprint > .corner.br { bottom: -6px; right: -6px; }

/* ── buttons ──────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  cursor: pointer; text-decoration: none;
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 14px; line-height: 1.2; color: var(--color-text);
  background: transparent; border: 1px solid var(--color-divider); border-radius: 0;
  padding: var(--space-2) calc(var(--space-3) * 1.2);
}
.btn:disabled { opacity: 0.45; cursor: not-allowed; }
.btn-primary, .btn-primary:hover { color: var(--color-bg); }
/* Steel 700 fill: Paper on Steel is only 3.71:1, below WCAG AA for button text. */
.btn-primary { background: var(--color-accent-700); border-color: var(--color-accent-700); }
.btn-primary:hover { background: var(--color-accent-800); border-color: var(--color-accent-800); }
.btn-primary:active { background: var(--color-accent-900); }
.btn-primary:disabled:hover { background: var(--color-accent-700); }
.btn-secondary, .btn-secondary:hover { color: var(--color-text); }
.btn-secondary:hover { background: color-mix(in srgb, var(--color-text) 7%, transparent); }
.btn-secondary:active { background: color-mix(in srgb, var(--color-text) 14%, transparent); }
.btn-ghost, .btn-ghost:hover { color: var(--color-accent-700); }
.btn-ghost { border-color: transparent; padding-inline: var(--space-1); }
.btn-ghost:hover { background: color-mix(in srgb, var(--color-accent) 10%, transparent); }
.btn-ghost:active { background: color-mix(in srgb, var(--color-accent) 18%, transparent); }
.btn-lg { font-size: 16px; padding: 12px 22px; }

/* ── type helpers ─────────────────────────────────────────────────────── */

.kicker {
  font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--color-accent-700);
}
.card-kicker {
  font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--color-accent-700);
}
.page-title { font-size: clamp(36px, 5vw, 64px); max-width: 860px; text-wrap: balance; }
.section-title { font-size: clamp(28px, 3.4vw, 40px); }
.lede {
  font-size: 17px; color: var(--color-neutral-800);
  max-width: 640px; text-wrap: pretty;
}

/* ── layout ───────────────────────────────────────────────────────────── */

.page { min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; }
.container {
  max-width: var(--content-max); margin: 0 auto;
  padding-left: var(--gutter); padding-right: var(--gutter);
}
.stack { display: flex; flex-direction: column; }
.page-section {
  padding-top: clamp(48px, 7vw, 88px);
  padding-bottom: clamp(64px, 9vw, 112px);
  gap: 40px;
}
.page-head { gap: 12px; }

/* ── header ───────────────────────────────────────────────────────────── */

.site-header {
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-bg);
}
.nav {
  display: flex; align-items: center; flex-wrap: wrap;
  gap: 12px 13.6px;
  padding-top: 18px; padding-bottom: 18px;
}
.nav-brand { display: flex; margin-right: auto; color: var(--color-text); text-decoration: none; }
.nav-brand:hover { color: var(--color-text); }
.nav-links { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.nav-links a:not(.btn) { color: var(--color-text); text-decoration: none; font-size: 14px; }
.nav-links a:not(.btn):hover,
.nav-links a:not(.btn)[aria-current] { color: var(--color-accent-700); }

/* ── logo ─────────────────────────────────────────────────────────────── */

.logo { display: inline-flex; align-items: center; line-height: 1; white-space: nowrap; }
.logo svg { flex: none; }
.logo-word { font-family: var(--font-body); font-weight: 500; letter-spacing: 0.02em; line-height: 1; }
.logo .ink { fill: var(--color-text); }
.logo .steel { fill: var(--color-accent); }
.logo .p { fill: none; stroke: var(--color-text); stroke-width: 3.5; stroke-miterlimit: 10; }

/* Horizontal lockup, H = 26px: wordmark 0.72H, gap 0.34H */
.logo--h { gap: 9px; color: var(--color-text); }
.logo--h svg { width: 26px; height: 26px; }
.logo--h .logo-word { font-size: 19px; }

/* Stacked reverse lockup, H = 56px: wordmark 0.5H, gap 0.3H */
.logo--stacked { flex-direction: column; align-items: flex-start; gap: 17px; color: var(--color-bg); }
.logo--stacked svg { width: 56px; height: 56px; }
.logo--stacked .logo-word { font-size: 28px; }
.logo--stacked .ink { fill: var(--color-bg); }
.logo--stacked .steel { fill: var(--color-accent-400); }
.logo--stacked .p { stroke: var(--color-bg); }

/* Practice lockup, H = 40px: horizontal lockup, hairline, descriptor 0.28H */
.logo--desc { gap: 14px; color: var(--color-text); }
.logo--desc svg { width: 40px; height: 40px; }
.logo--desc .logo-word { font-size: 29px; }
.logo-rule { width: 1px; align-self: stretch; background: var(--color-divider); }
.logo-desc {
  font-family: var(--font-body); font-weight: 500; font-size: 11px;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--color-accent-700);
}
@media (max-width: 480px) {
  .logo--desc { gap: 11px; }
  .logo--desc svg { width: 32px; height: 32px; }
  .logo--desc .logo-word { font-size: 23px; }
  .logo-desc { font-size: 10px; white-space: normal; }
}

/* ── sections (home) ──────────────────────────────────────────────────── */

.section { padding-top: clamp(48px, 7vw, 88px); padding-bottom: clamp(48px, 7vw, 88px); gap: 32px; }
.section + .section { border-top: 1px solid var(--color-divider); }
.section-head { gap: 10px; max-width: 760px; }
.section-head h2 { font-size: clamp(28px, 3.4vw, 40px); text-wrap: balance; }
.section-head p { font-size: 16px; color: var(--color-neutral-800); text-wrap: pretty; }
.hero-title { font-size: clamp(36px, 5.4vw, 68px); line-height: 1.05; max-width: 900px; text-wrap: balance; }
.hero-lede { font-size: clamp(17px, 1.6vw, 20px); color: var(--color-neutral-800); max-width: 640px; text-wrap: pretty; }
.steps .hero-text {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  letter-spacing: -0.015em; font-size: clamp(24px, 3.2vw, 40px);
}
.hero + .section { border-top: 1px solid var(--color-divider); }

/* Practice rows: code, name, claim, link */
.rows { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--color-text); }
.rows li { border-bottom: 1px solid var(--color-divider); }
.row {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr) auto;
  align-items: baseline; gap: 8px 24px; padding: 22px 8px;
  color: var(--color-text); text-decoration: none;
}
.row:hover { color: var(--color-text); background: color-mix(in srgb, var(--color-accent) 6%, transparent); }
.row-code { font-size: 12px; letter-spacing: 0.08em; color: var(--color-accent-700); }
.row-name { font-family: var(--font-heading); font-weight: 600; font-size: clamp(22px, 2.4vw, 28px); line-height: 1.15; }
.row-claim { font-size: 15px; color: var(--color-neutral-800); }
.row-go { font-size: 14px; color: var(--color-accent-700); white-space: nowrap; }
@media (max-width: 720px) {
  .row { grid-template-columns: minmax(0, 1fr); }
}

/* Supporting points on practice pages */
.points {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); gap: 28px;
}
.points--4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); }
@media (min-width: 1000px) { .points--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.point { padding: 24px; gap: 10px; }
.point-num { font-family: var(--font-heading); font-weight: 600; font-size: 28px; line-height: 1; color: var(--color-accent); }
.point h2 { font-size: 22px; line-height: 1.2; }
.point p { font-size: 15px; color: var(--color-neutral-800); }

.detail { display: flex; flex-wrap: wrap; gap: 32px 48px; border-top: 1px solid var(--color-text); padding-top: 28px; }
.detail > div { flex: 1 1 300px; min-width: 0; gap: 8px; }
.detail h2 { font-family: var(--font-body); font-weight: 400; font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--color-accent-700); }
.detail ul { list-style: none; margin: 0; padding: 0; }
.detail li { font-size: 15px; padding: 8px 0; border-top: 1px solid var(--color-divider); }
.detail p { font-size: 15px; color: var(--color-neutral-800); }

.steps { list-style: none; margin: 0; padding: 0; }
.intro-video { margin: 0; max-width: 960px; background: var(--color-accent-900); }
.intro-caption { padding: 10px 14px; font-size: 13px; color: var(--color-accent-300); }
.intro-video video { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; background: var(--color-accent-900); }
.cta-text { gap: 8px; }
.cta-title { font-size: clamp(24px, 3vw, 34px); line-height: 1.15; color: var(--color-bg); }
.cta-band .cta-mail { font-family: var(--font-body); font-weight: 400; font-size: 15px; line-height: 1.55; color: var(--color-accent-300); }
.cta-wrap { padding-bottom: clamp(64px, 9vw, 112px); }
.page-section:has(+ .cta-wrap) { padding-bottom: 40px; }
.cta-band .cta-mail a { color: var(--color-bg); }
.cta-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 16px 24px; }

/* ── home: hero ───────────────────────────────────────────────────────── */

.hero {
  padding-top: clamp(48px, 8vw, 96px);
  padding-bottom: clamp(48px, 7vw, 88px);
  gap: 40px;
}
.hero-lines { display: flex; flex-direction: column; border-top: 1px solid var(--color-divider); }
.hero-line {
  display: grid;
  grid-template-columns: clamp(40px, 6vw, 72px) minmax(0, 1fr);
  align-items: baseline;
  padding: clamp(12px, 1.6vw, 18px) 0;
  border-bottom: 1px solid var(--color-divider);
}
.hero-num {
  font-family: var(--font-body); font-weight: 500; font-size: 13px;
  letter-spacing: 0.08em; color: var(--color-accent-700);
}
.hero-text { font-size: clamp(30px, 4.6vw, 60px); line-height: 1.05; text-wrap: balance; }
.hero-line--accent .hero-text { color: var(--color-accent-700); }
.actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ── home: practices preview ──────────────────────────────────────────── */

.preview { padding-bottom: clamp(64px, 9vw, 112px); gap: 28px; }
.preview-head {
  display: flex; justify-content: space-between; align-items: flex-end;
  gap: 16px; flex-wrap: wrap;
}
.preview-head > div { gap: 8px; }
.preview-head p { font-size: 16px; color: var(--color-neutral-800); max-width: 560px; text-wrap: pretty; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
  gap: 28px;
}
.card {
  display: flex; flex-direction: column; gap: 10px;
  padding: 24px; min-height: 200px;
  color: var(--color-text); text-decoration: none;
  background: transparent;
}
.card:hover { color: var(--color-text); background: color-mix(in srgb, var(--color-accent) 6%, transparent); }
.card-title {
  font-family: var(--font-heading); font-weight: var(--font-heading-weight);
  font-size: 22px; line-height: 1.2;
}
.card-body { margin: 0; font-size: 14px; color: var(--color-neutral-800); flex: 1; }
.card--open {
  justify-content: space-between;
  background: var(--color-accent-900); color: var(--color-bg);
}
.card--open:hover { background: var(--color-accent-800); color: var(--color-bg); }
.card--open .card-kicker,
.card--open .card-link { color: var(--color-accent-300); }
.card--open .card-link { font-size: 14px; }

/* ── practices page ───────────────────────────────────────────────────── */

.practice-list { display: flex; flex-direction: column; border-top: 1px solid var(--color-text); }
.practice {
  display: flex; flex-wrap: wrap; gap: 16px 40px;
  padding: 32px 0; border-bottom: 1px solid var(--color-divider);
  scroll-margin-top: 24px;
}
.practice-num {
  flex: 0 0 56px;
  font-family: var(--font-heading); font-weight: 600; font-size: 28px; line-height: 1;
  color: var(--color-accent);
}
.practice-main { flex: 1 1 320px; min-width: 0; gap: 10px; }
.practice-main h2 { font-size: clamp(26px, 3vw, 34px); }
.practice--accent h2 { color: var(--color-accent-700); }
.practice-main p { font-size: 16px; color: var(--color-neutral-800); max-width: 520px; text-wrap: pretty; }
.practice-work { flex: 1 1 300px; min-width: 0; gap: 8px; }
.practice-work ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.practice-work li { font-size: 15px; padding: 8px 0; border-top: 1px solid var(--color-divider); }

.cta-band {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center;
  gap: 20px; padding: 32px;
  background: var(--color-accent-900); color: var(--color-bg);
}
.cta-band p {
  font-family: var(--font-heading); font-weight: 600;
  font-size: clamp(24px, 3vw, 34px); line-height: 1.15;
}

/* ── article ──────────────────────────────────────────────────────────── */

.article-meta { font-size: 13px; color: var(--color-neutral-700); }
.prose { max-width: 720px; gap: 18px; }
.prose h2 { font-size: clamp(26px, 3vw, 32px); margin-top: 28px; }
.prose p, .prose li { font-size: 17px; line-height: 1.6; color: var(--color-neutral-900); text-wrap: pretty; }
.prose ul, .prose ol { margin: 0; padding-left: 22px; display: flex; flex-direction: column; gap: 8px; }
.prose strong { font-weight: 500; }

.table-wrap { overflow-x: auto; border-top: 1px solid var(--color-text); }
.prose table { width: 100%; min-width: 560px; border-collapse: collapse; font-size: 14px; line-height: 1.45; }
.prose th, .prose td {
  text-align: left; vertical-align: top;
  padding: 10px 16px 10px 0; border-bottom: 1px solid var(--color-divider);
}
.prose thead th {
  font-size: 10px; font-weight: 400; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--color-accent-700);
}
.prose tbody th { font-weight: 500; }
.prose td { color: var(--color-neutral-800); }

.figure { margin: 12px 0; gap: 16px; }
.figure-title { font-family: var(--font-heading); font-weight: 600; font-size: 22px; line-height: 1.2; }
.prose .figure-note { font-size: 13px; color: var(--color-neutral-700); }

.eras {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px;
}
.prose .eras { padding: 0; display: grid; gap: 28px; }
.era { gap: 4px; padding: 20px; }
.era--accent { border-color: var(--color-accent); background: color-mix(in srgb, var(--color-accent) 10%, transparent); }
.era + .era::before {
  content: "→"; position: absolute; left: -14px; top: 50%; transform: translate(-50%, -50%);
  color: var(--color-accent); font-size: 16px;
}
.era-name { font-family: var(--font-heading); font-weight: 600; font-size: 22px; line-height: 1.2; }
.era-dates, .era-example { font-size: 13px; color: var(--color-neutral-700); }
.era dl {
  display: flex; flex-direction: column; gap: 10px;
  margin: 12px 0; padding: 12px 0; border-top: 1px solid var(--color-divider); border-bottom: 1px solid var(--color-divider);
}
.era dt { font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-accent-700); }
.era dd { margin: 0; font-size: 15px; }
@media (max-width: 720px) {
  .eras { grid-template-columns: minmax(0, 1fr); }
  .era + .era::before { content: "↓"; left: 50%; top: -14px; }
}

.flow { list-style: none; margin: 0; border-top: 1px solid var(--color-text); }
.prose .flow { padding: 0; gap: 0; }
.flow-step {
  display: grid; grid-template-columns: 44px minmax(0, 1fr) auto; align-items: baseline;
  gap: 4px 16px; padding: 14px 12px; border-bottom: 1px solid var(--color-divider);
}
.flow-step--gate { background: color-mix(in srgb, var(--color-accent) 10%, transparent); }
.flow-num { font-family: var(--font-heading); font-weight: 600; font-size: 20px; line-height: 1; color: var(--color-accent-700); }
.flow-main { display: flex; flex-direction: column; gap: 2px; }
.flow-name { font-family: var(--font-heading); font-weight: 600; font-size: 20px; line-height: 1.2; }
.flow-body { font-size: 15px; color: var(--color-neutral-800); }
.flow-who { font-size: 13px; color: var(--color-neutral-700); text-align: right; }
@media (max-width: 560px) {
  .flow-step { grid-template-columns: 36px minmax(0, 1fr); }
  .flow-who { grid-column: 2; text-align: left; }
}

/* Diagram: two cycles side by side (old cycle, new loop) */
.figure-head { gap: 4px; }
.figure-sub { font-size: 14px; color: var(--color-neutral-700); }
.cycles { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
.cycle { padding: 20px; gap: 12px; }
.cycle--accent { border-color: var(--color-accent); }
.cycle-name { font-family: var(--font-heading); font-weight: 600; font-size: 20px; line-height: 1.2; }
.prose .cycle-steps { border-top-color: var(--color-divider); }
.cycle-steps .flow-step { grid-template-columns: 32px minmax(0, 1fr); padding: 10px 8px; }
.cycle-steps .flow-name { font-size: 17px; }
.cycle-steps .flow-body { font-size: 14px; }
.cycle-loop { font-size: 14px; color: var(--color-neutral-700); }
.cycle--accent .cycle-loop { color: var(--color-accent-700); font-weight: 500; }
@media (max-width: 720px) { .cycles { grid-template-columns: minmax(0, 1fr); } }

/* Diagram: cost driver trees, result box, bracket, driver rows with notes */
.costtrees { display: flex; flex-direction: column; gap: 28px; }
.costtree { padding: 20px; gap: 14px; }
.costtree--own { border-color: var(--color-accent); }
.costtree-body { display: grid; grid-template-columns: minmax(120px, 180px) minmax(0, 1fr); align-items: center; gap: 0; }
.cost-result {
  padding: 14px 16px; font-family: var(--font-heading); font-weight: 600; font-size: 18px; line-height: 1.2;
  background: var(--color-accent-900); color: var(--color-bg);
}
.prose .cost-drivers {
  list-style: none; margin: 0 0 0 24px; padding: 0 0 0 16px; gap: 0;
  border-left: 1px solid var(--color-text); position: relative;
}
.prose .cost-drivers::before {
  content: ""; position: absolute; left: -25px; top: 50%; width: 24px; border-top: 1px solid var(--color-text);
}
.prose .cost-driver {
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 4px 16px; align-items: baseline;
  padding: 8px 8px; border-bottom: 1px solid var(--color-divider); font-size: 15px;
}
.prose .cost-driver:last-child { border-bottom: 0; }
.cost-driver--key { background: color-mix(in srgb, var(--color-accent) 10%, transparent); }
.cost-name { font-weight: 500; }
.cost-note { font-size: 14px; color: var(--color-neutral-700); }
@media (max-width: 640px) {
  .costtree-body { grid-template-columns: minmax(0, 1fr); gap: 12px; }
  .prose .cost-drivers { margin-left: 0; }
  .prose .cost-drivers::before { display: none; }
  .prose .cost-driver { grid-template-columns: minmax(0, 1fr); }
}

/* Diagram: point-to-point links vs. a shared backbone (inline SVG) */
.hub-panels { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
.hub { width: 100%; height: auto; }
.hub-line { stroke: var(--color-neutral-700); stroke-opacity: 0.55; stroke-width: 1; }
.hub-spoke { stroke: var(--color-text); stroke-width: 1; }
.hub-node { fill: var(--color-text); }
.hub-label { font-family: var(--font-body); font-size: 11px; fill: var(--color-text); }
.hub-core { fill: var(--color-accent-900); }
.hub-core-text { font-family: var(--font-heading); font-weight: 600; font-size: 12px; fill: var(--color-bg); }
.hub-adapter { fill: var(--color-accent); stroke: var(--color-accent-700); stroke-width: 1; }
.prose .hub-key { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--color-neutral-700); }
.hub-key-mark { flex: none; width: 12px; height: 12px; background: var(--color-accent); border: 1px solid var(--color-accent-700); }
@media (max-width: 720px) { .hub-panels { grid-template-columns: minmax(0, 1fr); } }

/* Diagram: 2 x 2 matrix with axis labels */
.matrix { display: grid; grid-template-columns: auto minmax(0, 1fr); grid-template-rows: auto auto; gap: 8px 12px; }
.matrix-y {
  grid-row: 1; grid-column: 1; writing-mode: vertical-rl; transform: rotate(180deg);
  font-size: 13px; color: var(--color-neutral-700); text-align: center;
}
.matrix-x { grid-row: 2; grid-column: 2; font-size: 13px; color: var(--color-neutral-700); text-align: center; }
.matrix-ends { color: var(--color-accent-700); margin-left: 6px; }
.matrix-y .matrix-ends { margin: 6px 0 0; }
.matrix-grid {
  grid-row: 1; grid-column: 2; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  border-left: 1px solid var(--color-text); border-bottom: 1px solid var(--color-text);
}
.matrix-cell { padding: 16px; min-height: 140px; display: flex; flex-direction: column; gap: 8px; border-right: 1px solid var(--color-divider); border-top: 1px solid var(--color-divider); }
.matrix-cell--accent { background: color-mix(in srgb, var(--color-accent) 14%, transparent); }
.matrix-zone { font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-neutral-700); }
.matrix-cell--accent .matrix-zone { color: var(--color-accent-700); font-weight: 500; }
.prose .matrix-cell ul { list-style: none; padding: 0; margin: 0; gap: 6px; }
.prose .matrix-cell li { font-size: 14px; line-height: 1.35; padding-left: 16px; position: relative; }
.prose .matrix-cell li::before {
  content: ""; position: absolute; left: 0; top: 0.45em; width: 8px; height: 8px; border-radius: 50%;
  background: var(--color-neutral-700);
}
.prose .matrix-cell--accent li::before { background: var(--color-accent-700); }
@media (max-width: 560px) { .matrix-cell { min-height: 0; padding: 12px; } }

/* Diagram: three-layer stack with a maintenance-agents column */
.layers { display: grid; grid-template-columns: minmax(0, 1fr) minmax(180px, 220px); gap: 28px; align-items: stretch; }
.layers-main { gap: 12px; }
.layer { padding: 16px 20px; gap: 4px; }
.layer--process {
  font-family: var(--font-heading); font-weight: 600; font-size: 18px;
  background: var(--color-accent-900); color: var(--color-bg);
}
.layer--custom { border-color: var(--color-accent); background: color-mix(in srgb, var(--color-accent) 10%, transparent); }
.layer-name { font-family: var(--font-heading); font-weight: 600; font-size: 20px; line-height: 1.2; }
.layer-body { font-size: 15px; }
.layer-note { font-size: 13px; color: var(--color-neutral-700); }
.layer-arrow { font-size: 13px; color: var(--color-accent-700); }
.prose .chips, .prose .agent-tasks { list-style: none; padding: 0; margin: 4px 0; }
.prose .chips { flex-direction: row; flex-wrap: wrap; gap: 6px; }
.prose .chips li { font-size: 13px; line-height: 1.3; padding: 4px 10px; border: 1px solid var(--color-divider); }
.layers-agents { padding: 16px 20px; gap: 8px; }
.prose .agent-tasks { gap: 0; }
.prose .agent-tasks li { font-size: 15px; padding: 6px 0; border-top: 1px solid var(--color-divider); }
.agent-gate {
  margin-top: auto; padding: 8px 10px; font-size: 14px; font-weight: 500;
  border: 1px solid var(--color-accent); color: var(--color-accent-700);
}
@media (max-width: 720px) { .layers { grid-template-columns: minmax(0, 1fr); } }

.sources { gap: 12px; margin-top: 12px; padding-top: 20px; border-top: 1px solid var(--color-divider); }
.prose .sources h2 { margin-top: 0; font-size: 22px; }
.prose .sources li { font-size: 14px; color: var(--color-neutral-800); }

/* ── contact ──────────────────────────────────────────────────────────── */

.contact-layout { display: flex; flex-wrap: wrap; gap: 48px; align-items: flex-start; }
.contact-main { flex: 1 1 480px; min-width: 0; }
.contact-form { display: flex; flex-direction: column; gap: 20px; }
.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr));
  gap: 20px;
}
.field > label {
  display: block; font-size: 12px; margin-bottom: 5px;
  color: color-mix(in srgb, var(--color-text) 70%, transparent);
}
.input {
  display: block; width: 100%; min-height: 36px; padding: 6px 10px; margin: 0;
  font: inherit; font-size: 14px; color: var(--color-text); caret-color: var(--color-accent);
  background: var(--color-surface);
  border: 1px solid var(--color-divider); border-radius: 0;
}
.input:hover { border-color: color-mix(in srgb, var(--color-text) 45%, transparent); }
.input:focus-visible { border-color: var(--color-accent); outline-offset: 0; }
textarea.input { min-height: 160px; resize: vertical; }
select.input {
  appearance: none; -webkit-appearance: none;
  padding-right: 32px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%235d5d60' stroke-width='1.5'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 10px center;
}
.input[aria-invalid="true"] { border-color: var(--color-accent-700); }
.field-error { display: block; margin-top: 5px; font-size: 12px; color: var(--color-accent-800); }
.field-error:empty { display: none; }
.form-error {
  display: none;
  padding: 12px 14px; font-size: 14px; color: var(--color-accent-800);
  border: 1px solid var(--color-accent-700);
  background: color-mix(in srgb, var(--color-accent) 8%, transparent);
}
.form-error.is-shown { display: block; }
.form-actions { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.form-actions .btn { padding: 12px 26px; font-size: 16px; }
.form-note { font-size: 12px; color: var(--color-neutral-700); }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

.success { display: none; padding: 32px; gap: 12px; align-items: flex-start; }
.success.is-shown { display: flex; }
.success p { font-size: 15px; color: var(--color-neutral-800); }

/* Without JavaScript the handler redirects to #sent / #send-error;
   :target swaps the form for the matching panel. */
:root:not(.js) #sent:target { display: flex; }
:root:not(.js) .contact-main:has(#sent:target) .contact-form { display: none; }
:root:not(.js) #send-error:target { display: block; }

.contact-aside {
  flex: 1 1 280px; min-width: 0;
  border-top: 1px solid var(--color-text);
}
.contact-aside > div {
  padding: 20px 0; gap: 4px;
  border-bottom: 1px solid var(--color-divider);
}
.contact-aside > div:last-child { border-bottom: 0; }
.person-name { font-family: var(--font-heading); font-weight: 600; font-size: 20px; }
.person-role { font-size: 13px; color: var(--color-neutral-700); }
.contact-aside a, .contact-aside .value { font-size: 15px; }

/* ── privacy ──────────────────────────────────────────────────── */

.legal {
  max-width: 820px;
  padding-top: clamp(48px, 7vw, 88px);
  padding-bottom: clamp(64px, 9vw, 112px);
  gap: 48px;
}
.legal > section { gap: 20px; }
.legal h1 { font-size: clamp(32px, 4.4vw, 52px); scroll-margin-top: 24px; text-wrap: balance; }
.legal-block h2 { font-size: 25px; }
.legal-block .company-grid { border-top: 0; padding-top: 4px; }
.company-grid {
  display: grid; grid-template-columns: minmax(120px, 180px) minmax(0, 1fr);
  gap: 10px 24px; margin: 0;
  font-size: 15px; border-top: 1px solid var(--color-divider); padding-top: 20px;
}
.company-grid dt { color: var(--color-neutral-700); }
.company-grid dd { margin: 0; overflow-wrap: anywhere; }
@media (max-width: 480px) {
  .company-grid { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .company-grid dt { font-size: 12px; }
  .company-grid dd + dt { margin-top: 12px; }
}
.legal-note { font-size: 13px; color: var(--color-neutral-700); }
.legal-block { gap: 6px; border-top: 1px solid var(--color-divider); padding-top: 20px; }
.legal-block p { font-size: 15px; color: var(--color-neutral-800); }

/* ── 404 ──────────────────────────────────────────────────────────────── */

.notfound { gap: 24px; align-items: flex-start; }

/* ── footer ───────────────────────────────────────────────────────────── */

.site-footer { background: var(--color-accent-900); color: var(--color-bg); }
.footer-inner { padding-top: 48px; padding-bottom: 32px; gap: 40px; }
.footer-top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 40px; }
.footer-cols { display: flex; flex-wrap: wrap; gap: 48px; font-size: 14px; }
.footer-cols > * { gap: 6px; }
.footer-cols .card-kicker { color: var(--color-accent-300); }
.footer-cols a { color: var(--color-bg); text-decoration: none; }
.footer-cols a:hover { color: var(--color-accent-300); }
.footer-bottom {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px;
  padding-top: 20px; border-top: 1px solid var(--color-accent-800);
  font-size: 12px; color: var(--color-accent-300);
}
.footer-bottom nav { display: flex; gap: 20px; }
.footer-bottom a { color: var(--color-accent-300); }
.footer-bottom a:hover { color: var(--color-bg); }
.site-footer :focus-visible { outline-color: var(--color-accent-400); }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}