@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;450;500;550;600;650;700&display=swap');

/* Shared identity, type and spacing. Keep future pages on these scales. */
:root {
  --paper: #f5f4ee;
  --white: #fdfcf8;
  --ink: #172d45;
  --muted: #596572;
  --accent: #7e5e27;
  --gold: #c29a4b;
  --accent-light: #ede4d2;
  --line: #d8dadd;
  --dark: #10263c;
  --on-dark: #f7f5ef;
  --muted-on-dark: #c4cfd9;
  --line-on-dark: #41576c;
  --surface: #edf0f2;
  --surface-warm: #efe9dc;
  --space-1: .5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 5rem;
  --space-7: 7rem;
  --type-display: clamp(2.375rem, 1.2rem + 4.25vw, 5.1rem);
  --type-heading: clamp(2.25rem, 1.35rem + 2.65vw, 4rem);
  --type-compact: clamp(2rem, 1.4rem + 1.8vw, 3rem);
  --type-card: 1.375rem;
  --type-lead: clamp(1.125rem, 1rem + .3vw, 1.25rem);
  --type-body: 1rem;
  --type-small: .875rem;
  --type-meta: .75rem;
  --line-body: 1.7;
  --line-heading: 1.12;
  --section-space: clamp(4.5rem, 8vw, 7rem);
  --layout-gap: clamp(2rem, 4.5vw, 4rem);
  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --container: 1440px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 2rem; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: 'DM Sans', Arial, sans-serif; font-size: var(--type-body); overflow-wrap: anywhere; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
button, a, summary { -webkit-tap-highlight-color: transparent; }
button, summary { cursor: pointer; }
a:focus-visible, button:focus-visible, summary:focus-visible, [tabindex="-1"]:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
::selection { background: var(--accent-light); color: var(--ink); }
img { display: block; max-width: 100%; }
figure, p { margin: 0; }
p { line-height: var(--line-body); }
h1, h2, h3 { margin: 0; font-weight: 450; overflow-wrap: break-word; }
h1, h2 { letter-spacing: -.045em; line-height: var(--line-heading); text-wrap: balance; }
h1, .heading-display { font-size: var(--type-display); }
h2, .heading-section { font-size: var(--type-heading); }
h3, .heading-card { font-size: var(--type-card); letter-spacing: -.025em; line-height: 1.3; }
.heading-compact { font-size: var(--type-compact); }
.lead { font-size: var(--type-lead); line-height: var(--line-body); }
.text-muted { color: var(--muted); }
.eyebrow, .section-label { font-size: var(--type-small); font-weight: 550; letter-spacing: .08em; line-height: 1.6; }
.container { width: min(calc(100% - var(--gutter) * 2), var(--container)); margin-inline: auto; }
.section { padding-block: var(--section-space); }
.section-rail { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 3fr); gap: var(--layout-gap); }
.section-label { display: flex; align-items: baseline; gap: var(--space-2); color: var(--accent); margin-bottom: var(--space-4); }
.section-number { font-size: var(--type-meta); flex: 0 0 auto; }
.section-rail > .section-label { margin-top: .4rem; }
.copy-columns { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-5); }
.copy-columns > p:last-child { color: var(--muted); }
.section-heading-row { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: var(--layout-gap); align-items: end; margin-bottom: var(--space-5); }
.section-heading-row > p { max-width: 46ch; justify-self: end; color: var(--muted); }

/* Navigation and actions. Internal navigation uses directional, not external-link, arrows. */
.skip-link { position: fixed; z-index: 20; top: 1rem; left: 1rem; padding: 1rem; background: var(--ink); color: var(--white); transform: translateY(-200%); }
.skip-link:focus { transform: translateY(0); }
.site-header { border-bottom: 1px solid var(--line); background: #fff; }
.header-inner { min-height: 96px; display: flex; flex-wrap: wrap; align-items: center; gap: 16px 28px; padding-block: var(--space-2); }
.brand { display: inline-block; flex: 0 0 auto; max-width: 100%; }
.brand-logo { width: 184px; height: auto; }
.primary-navigation { display: flex; flex-wrap: wrap; align-items: center; gap: 28px; min-width: 0; margin-left: auto; font-size: 1.05rem; }
.primary-navigation a { display: inline-flex; align-items: center; min-height: 44px; transition: color .15s; }
.primary-navigation a:hover, .footer-navigation a:hover { text-decoration: underline; text-underline-offset: .35em; }
.nav-support { border-left: 1px solid var(--line); padding-left: 28px; }
.menu-toggle { display: none; }
.text-link { display: inline-flex; justify-content: space-between; align-items: center; gap: 28px; min-height: 48px; padding-block: 10px; border-bottom: 1px solid currentColor; font-size: var(--type-small); font-weight: 550; }
.text-link span { font-size: 1.125rem; }
.text-link:hover { color: var(--accent); }
.email-link { min-width: 0; max-width: 100%; overflow-wrap: anywhere; text-decoration: underline; text-underline-offset: .2em; }
.email-link:hover { text-decoration-thickness: 2px; }
.button { display: inline-flex; justify-content: center; align-items: center; gap: var(--space-2); min-height: 48px; padding: 12px 22px; border: 1px solid var(--ink); background: var(--ink); color: var(--white); font-size: var(--type-small); font-weight: 500; cursor: pointer; }
.button-outline { background: transparent; color: var(--ink); }
.button:hover { background: var(--accent); border-color: var(--accent); color: var(--white); }
.button:disabled { cursor: not-allowed; opacity: .6; }
.action-group { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-4); }
.action-group > a { max-width: 100%; }
.action-group > .button span { flex: 0 0 auto; }
.concept-figure { min-width: 0; }
.concept-figure img { width: 100%; height: auto; background: var(--surface-warm); }
.concept-figure figcaption { margin-top: var(--space-2); color: var(--muted); font-size: var(--type-small); line-height: var(--line-body); }
.editorial-split { display: grid; grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr); gap: var(--layout-gap); align-items: center; }
.editorial-split .section-copy > h2 { font-size: var(--type-compact); }
.contact-actions { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 7.5rem), 1fr)); gap: var(--space-2); max-width: 48rem; margin-top: var(--space-4); }
.contact-action { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: var(--space-1); min-width: 0; min-height: 48px; padding: var(--space-2) var(--space-1); border: 1px solid transparent; text-align: center; font-size: var(--type-small); line-height: 1.5; }
.contact-action:hover, .contact-action:focus-visible { background: var(--surface-warm); border-color: var(--accent); }
.contact-action:hover .contact-action-label, .contact-action:focus-visible .contact-action-label { text-decoration: underline; text-underline-offset: .25em; }
.contact-action-icon { position: relative; flex: 0 0 auto; width: 5.25rem; max-width: 100%; aspect-ratio: 3 / 4; overflow: hidden; }
.contact-action-icon img { position: absolute; top: 0; left: 0; width: 400%; max-width: none; height: 100%; }
.contact-action-icon--location img { left: -100%; }
.contact-action-icon--partnerships img { left: -200%; }
.contact-action-icon--technical img { left: -300%; }

/* Shared floating control; it never takes space from the page layout. */
.back-to-top-floating { position: fixed; z-index: 15; right: max(28px, env(safe-area-inset-right)); bottom: max(28px, env(safe-area-inset-bottom)); display: inline-flex; align-items: center; justify-content: center; width: 48px; height: 48px; padding: 0; border: 1px solid var(--gold); border-radius: 50%; background: var(--dark); color: var(--on-dark); box-shadow: 0 3px 12px rgb(16 38 60 / 16%); opacity: 0; visibility: hidden; pointer-events: none; transform: translateY(4px); transition: opacity 180ms ease, transform 180ms ease, visibility 180ms; }
.back-to-top-floating[hidden] { display: none; }
.back-to-top-floating.is-visible { opacity: 1; visibility: visible; pointer-events: auto; transform: translateY(0); }
.back-to-top-floating:hover { color: var(--gold); }
.back-to-top-floating:focus-visible { outline: 3px solid var(--gold); outline-offset: 4px; box-shadow: 0 0 0 4px var(--dark); }
.back-to-top-floating svg { width: 22px; height: 22px; }
@media (max-width: 900px) {
  .back-to-top-floating { width: 44px; height: 44px; right: calc(18px + env(safe-area-inset-right)); bottom: calc(18px + env(safe-area-inset-bottom)); }
}

/* Footer shared by all future pages. */
.site-footer { background: var(--dark); color: var(--on-dark); padding: var(--space-6) 0 var(--space-3); }
.site-footer > .container { container: footer-content / inline-size; }
.footer-main { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr) minmax(0, .7fr); gap: var(--layout-gap); }
.footer-brand { padding: 0; background: transparent; }
.footer-brand .brand-logo { width: 208px; }
.footer-statement { font-size: clamp(1.5rem, 1rem + 1.5vw, 2.4rem); letter-spacing: -.035em; line-height: 1.4; }
.footer-navigation { display: flex; flex-direction: column; align-items: flex-start; justify-self: end; font-size: 1.05rem; overflow-wrap: normal; }
.footer-navigation a { display: inline-flex; align-items: center; min-height: 44px; }
.footer-contact { display: flex; align-items: baseline; gap: var(--space-4); margin-top: var(--space-5); padding: var(--space-3) 0; border-top: 1px solid var(--line-on-dark); color: var(--muted-on-dark); }
.footer-contact > span { flex-shrink: 0; font-size: .9rem; letter-spacing: .12em; }
.footer-contact p { font-size: 1.05rem; }
.footer-contact > .email-link { display: block; padding-block: var(--space-1); font-size: 1.05rem; line-height: var(--line-body); }
.footer-bottom { border-top: 1px solid var(--line-on-dark); display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center; justify-content: space-between; padding-top: var(--space-3); font-size: .9rem; color: var(--muted-on-dark); }
.footer-bottom > span:nth-child(2) { letter-spacing: .08em; }
.footer-main + .footer-bottom { margin-top: var(--space-5); }
.footer-bottom a { display: inline-flex; align-items: center; gap: 14px; min-height: 44px; font-size: 1.05rem; }
.site-footer a:focus-visible { outline-color: var(--muted-on-dark); }

/* Editorial page primitives. Additive: existing homepage compositions are unchanged. */
.primary-navigation a[aria-current="page"], .footer-navigation a[aria-current="page"] { text-decoration: underline; text-underline-offset: .35em; text-decoration-thickness: 1px; }
.page-hero { padding-block: var(--space-5); border-bottom: 1px solid var(--line); }
.page-hero > .eyebrow { color: var(--accent); margin-bottom: var(--space-3); }
.page-hero h1 span { color: #33516b; }
.page-hero > .lead { max-width: 65ch; margin-top: var(--space-4); }
.page-status { display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--space-2) var(--space-5); margin-top: var(--space-5); padding-top: var(--space-3); border-top: 1px solid var(--line); color: var(--muted); }
.page-status > span { font-size: var(--type-meta); letter-spacing: .06em; line-height: 1.7; }
.page-status > p { font-size: var(--type-small); max-width: 58ch; }
.section-copy { min-width: 0; }
.section-copy > h2 { margin-bottom: var(--space-4); }
.section-copy > p + p { margin-top: var(--space-3); }
.section-copy > p:not(.lead) { color: var(--muted); }
.learning-list { margin: var(--space-4) 0 0; padding: 0; }
.learning-list > div { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.5fr); gap: var(--space-4); padding-block: var(--space-3); border-top: 1px solid var(--line); }
.learning-list dt { font-weight: 500; line-height: var(--line-body); }
.learning-list dd { margin: 0; color: var(--muted); line-height: var(--line-body); }
.principle-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-4); }
.principle-card { min-width: 0; border-top: 1px solid var(--line); padding-block: var(--space-3); }
.principle-number { font-size: var(--type-meta); color: var(--muted); }
.principle-card h3 { margin-top: var(--space-3); }
.principle-card p { margin-top: var(--space-2); color: var(--muted); }
.development-note { border-left: 2px solid var(--accent); padding-left: var(--space-3); }
.development-note > .eyebrow { color: var(--accent); margin-bottom: var(--space-1); }
.development-note > p:last-child { color: var(--muted); }

@media (max-width: 1100px) {
  .principle-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 760px) {
  .page-hero { padding-block: var(--space-4); }
  .page-status { margin-top: var(--space-4); }
  .learning-list > div { grid-template-columns: minmax(0, 1fr); gap: var(--space-1); }
}
@media (max-width: 520px) {
  .principle-grid { grid-template-columns: minmax(0, 1fr); gap: var(--space-1); }
}

@media (max-width: 1100px) {
  .primary-navigation { gap: 24px; }
  .section-rail { grid-template-columns: minmax(0, 1fr) minmax(0, 2.5fr); gap: var(--space-3); }
  .copy-columns { gap: var(--space-3); }
}
@media (max-width: 900px) {
  .editorial-split { grid-template-columns: minmax(0, 1fr); }
  .header-inner { min-height: 80px; flex-wrap: wrap; gap: 0; }
  .site-header .brand-logo { width: 156px; }
  .js .menu-toggle { display: inline-flex; flex: 0 0 44px; align-items: center; justify-content: center; width: 44px; height: 44px; margin-left: auto; padding: 0; color: var(--ink); background: transparent; border: 1px solid transparent; border-radius: 6px; }
  .menu-toggle:hover { background: var(--paper); border-color: var(--line); }
  .menu-icon { position: relative; display: block; width: 20px; height: 20px; }
  .menu-icon::before, .menu-icon::after { content: ''; position: absolute; left: 0; top: calc(50% - .75px); width: 20px; height: 1.5px; border-radius: 1px; background: currentColor; transition: transform 180ms ease; }
  .menu-icon::before { transform: translateY(-4px); }
  .menu-icon::after { transform: translateY(4px); }
  .menu-toggle[aria-expanded="true"] .menu-icon::before { transform: rotate(45deg); }
  .menu-toggle[aria-expanded="true"] .menu-icon::after { transform: rotate(-45deg); }
  .primary-navigation { display: flex; flex-basis: 100%; flex-direction: column; align-items: stretch; gap: 0; padding: 8px 0 22px; }
  .js .primary-navigation { display: none; }
  .js .primary-navigation.is-open { display: flex; }
  .primary-navigation a { padding: 15px 0; border-bottom: 1px solid var(--line); }
  .nav-support { border-left: 0; }
}
@media (max-width: 760px) {
  .section-rail, .copy-columns, .section-heading-row { grid-template-columns: minmax(0, 1fr); gap: var(--space-3); }
  .section-rail > .section-label { margin: 0 0 var(--space-1); }
  .section-heading-row > p { justify-self: start; }
  .footer-main { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-4); }
  .footer-statement { grid-column: 1 / -1; grid-row: 2; }
  .footer-navigation { justify-self: start; }
  .footer-contact { display: block; }
  .footer-contact p { margin-top: var(--space-1); }
  .footer-bottom > span:first-child { width: 100%; }
}
@container footer-content (max-width: 24rem) {
  .footer-main { grid-template-columns: minmax(0, 1fr); }
  .footer-statement { grid-column: auto; grid-row: auto; }
}
@container footer-content (max-width: 20rem) {
  .footer-statement { font-size: 1.375rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}