/* ==========================================================================
   knotenhub.com — styles
   Structure: 1 tokens · 2 base · 3 layout · 4 components · 5 sections · 6 responsive
   Design brief: DESIGN.md
   ========================================================================== */

/* 1. Tokens ---------------------------------------------------------------- */

:root {
  color-scheme: light;

  /* Brand palette (from the logo). Components never use these directly. */
  --brand-green: #207343;
  --brand-green-light: #89b193;
  --brand-orange: #ae4f00;
  --brand-cream: #f2eee3;
  --brand-ink: #1a1a1a;

  /* Semantic colours — light */
  --color-background: var(--brand-cream);
  --color-surface: #ffffff;
  --color-surface-subtle: #f9f7f1;
  --color-surface-inverse: var(--brand-ink);

  --color-text-primary: var(--brand-ink);
  --color-text-secondary: #4a4a4a;
  --color-text-muted: #5c5c5c;
  --color-text-on-inverse: #d6d2c8;
  --color-text-on-inverse-strong: var(--brand-cream);

  /* Separators need ≥3:1. #857f72 is 3.4:1 on cream, 4.0:1 on white. */
  --color-border: #857f72;
  /* Footer rule on the ink band. #6e6e6e is 3.4:1 on #1a1a1a. */
  --color-border-inverse: #6e6e6e;

  --color-primary: var(--brand-green);
  --color-primary-hover: #185a35;
  --color-primary-active: #124528;
  --color-on-primary: var(--brand-cream);

  /* Brand band (contact section): stays green in both themes */
  --color-primary-container: var(--brand-green);
  --color-on-primary-container: var(--brand-cream);
  --color-on-primary-container-hover: #ffffff;
  --color-on-primary-container-active: #e6e2d7;

  --color-accent: var(--brand-orange);

  /* Semantic status colours. Reserved: no component on this page uses them yet. */
  --color-success: var(--brand-green);
  --color-warning: var(--brand-orange);
  --color-error: #b3261e;
  --color-info: #1f5f8b;

  --color-focus: var(--color-primary);

  /* Type scale (base 18px) */
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --text-small: 0.875rem;
  --text-body: 1.125rem;
  --text-lead: 1.375rem;
  --text-h3: 1.5rem;
  --text-h2: clamp(1.75rem, 1.25rem + 2vw, 2.5rem);
  --text-h1: clamp(2.25rem, 1.5rem + 4vw, 4rem);
  --leading-body: 1.6;
  --leading-tight: 1.15;

  /* Spacing scale: 4 / 8 / 12 / 16 / 24 / 32 / 48 / 64 / 96 */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;

  --radius: 6px;
  --max-width: 1100px;
  --measure: 65ch;
  --header-height: 4rem;
  --duration: 150ms;
  --duration-enter: 250ms;
  --ease-out: cubic-bezier(0.2, 0.7, 0.3, 1);
  /* Signature moments (hero signals, knot tying) take a little longer */
  --duration-signature: 600ms;
  --duration-signal: 1300ms;

  /* Knot motif: strands and node sizes */
  --strand-width: 2px;
  --node-size: 1rem;
}

:root[data-theme="dark"] {
  color-scheme: dark;

  --color-background: #121212;
  --color-surface: #1c1c1c;
  --color-surface-subtle: #171717;
  --color-surface-inverse: #0a0a0a;

  --color-text-primary: var(--brand-cream);
  --color-text-secondary: #c9c5ba;
  --color-text-muted: #a0a0a0;

  /* 3.7:1 on #121212, 3.3:1 on the dark surface. */
  --color-border: #6e6e6e;

  --color-primary: var(--brand-green-light);
  --color-primary-hover: #a3c4ab;
  --color-primary-active: #b8d2be;
  --color-on-primary: #121212;
}

/* 2. Base ------------------------------------------------------------------ */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--space-4));
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 var(--space-4);
  font-weight: 700;
  line-height: var(--leading-tight);
  letter-spacing: -0.01em;
  text-wrap: balance;
}

h1 { font-size: var(--text-h1); letter-spacing: -0.02em; }
h2 { font-size: var(--text-h2); }
h3 { font-size: var(--text-h3); }
h4 { font-size: var(--text-body); }

p {
  margin: 0 0 var(--space-4);
}

p:last-child {
  margin-bottom: 0;
}

.lead {
  font-size: var(--text-lead);
  line-height: 1.45;
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 0.15em;
  transition: color var(--duration) ease;
}

a:hover {
  color: var(--color-primary-hover);
}

img,
svg {
  display: block;
}

/* Keyboard focus: one consistent ring everywhere.
   data-focus-forced covers programmatic focus, which does not match :focus-visible. */
:focus-visible,
[data-focus-forced]:focus {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    transition-duration: 0s !important;
  }
}

/* 3. Layout ---------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.section {
  padding: var(--space-8) 0;
}

.prose {
  max-width: var(--measure);
}

/* 4. Components ------------------------------------------------------------ */

/* Skip link — visible only when focused */
.skip-link {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 200;
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface);
  color: var(--color-text-primary);
  border-radius: var(--radius);
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: none;
}

/* Buttons: default · hover · focus · active · disabled */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
  padding: var(--space-3) var(--space-5);
  border: 1px solid transparent;
  border-radius: var(--radius);
  font: inherit;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  transition: background-color var(--duration) ease, color var(--duration) ease;
}

.btn:hover {
  background-color: var(--color-primary-hover);
  color: var(--color-on-primary);
}

.btn:active {
  background-color: var(--color-primary-active);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.5;
}

.btn-large {
  min-height: 3rem;
  padding: var(--space-3) var(--space-6);
}

/* Inverted button for use on the primary-coloured band */
.btn-inverse {
  background-color: var(--color-on-primary-container);
  color: var(--brand-ink);
}

.btn-inverse:hover {
  background-color: var(--color-on-primary-container-hover);
  color: var(--brand-ink);
}

.btn-inverse:active {
  background-color: var(--color-on-primary-container-active);
}

/* Icon buttons (theme + menu toggle): 44px targets */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: none;
  color: var(--color-text-primary);
  cursor: pointer;
  transition: background-color var(--duration) ease, border-color var(--duration) ease;
}

.icon-btn:hover {
  background-color: var(--color-surface);
  border-color: var(--color-border);
}

.icon-btn:active {
  background-color: var(--color-surface-subtle);
}

.icon-btn svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Theme toggle shows the theme you would switch TO */
:root:not([data-theme="dark"]) .icon-sun,
:root[data-theme="dark"] .icon-moon {
  display: none;
}

/* Menu shows a close icon while open. The accessible name stays "Menu". */
.menu-toggle .icon-close {
  display: none;
}

.menu-toggle[aria-expanded="true"] .icon-menu {
  display: none;
}

.menu-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

/* Logo: swap the real SVG per theme instead of filtering */
:root:not([data-theme="dark"]) .logo-on-dark,
:root[data-theme="dark"] .logo-on-light {
  display: none;
}

/* 5. Sections -------------------------------------------------------------- */

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-border);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  height: var(--header-height);
}

.logo {
  display: inline-flex;
  align-items: center;
  height: 2.75rem;
  border-radius: var(--radius);
}

.logo img {
  height: 2.75rem;
  width: auto;
}

.nav-links {
  margin-left: auto;
}

.nav-links ul {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-links a:not(.btn) {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--color-text-primary);
  font-weight: 500;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color var(--duration) ease;
}

.nav-links a:not(.btn):hover,
.nav-links a:not(.btn)[aria-current="location"] {
  color: var(--color-text-primary);
  border-bottom-color: var(--color-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.menu-toggle {
  display: none;
}

/* Hero */
.hero {
  padding: var(--space-9) 0;
  text-align: center;
}

.hero h1 {
  max-width: 18ch;
  margin-inline: auto;
  margin-bottom: var(--space-5);
}

.hero .lead {
  max-width: 40ch;
  margin: 0 auto var(--space-6);
  color: var(--color-text-secondary);
}

/* About */
.about {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.about .lead {
  margin-bottom: var(--space-5);
  padding-left: var(--space-5);
  border-left: 3px solid var(--color-primary);
}

.about p:not(.lead) {
  color: var(--color-text-secondary);
}

/* Services: four offers. Infrastructure detail opens on request. */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-7);
  max-width: var(--measure);
  margin-top: var(--space-7);
  padding: 0;
  list-style: none;
}

.service {
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.service h3 {
  margin-bottom: var(--space-2);
}

.service p {
  color: var(--color-text-secondary);
}

.service ul {
  margin: var(--space-4) 0 0;
  padding-left: var(--space-5);
  color: var(--color-text-secondary);
}

.service li + li {
  margin-top: var(--space-1);
}

/* Roles inside a lifecycle group */
.service .roles {
  display: grid;
  gap: var(--space-5);
  margin-top: var(--space-5);
  padding-left: 0;
  list-style: none;
  color: inherit;
}

.service .roles > li + li {
  margin-top: 0;
}

.role h4 {
  margin-bottom: var(--space-1);
}

.service details {
  margin-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.service details + details {
  margin-top: 0;
}

.service details[open] {
  padding-bottom: var(--space-3);
}

.service summary {
  display: list-item;
  min-height: 2.75rem;
  padding: var(--space-3) 0;
  cursor: pointer;
}

.service summary .summary-title {
  font-weight: 600;
}

.service summary:hover {
  color: var(--color-primary);
}

.service summary:active {
  color: var(--color-primary-active);
}

.service details > p {
  margin-top: var(--space-2);
}

/* Hero network: the knot from the logo, labelled with what plugs in */
.hero {
  text-align: left;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: var(--space-7);
  align-items: center;
}

.hero .hero-text h1,
.hero .hero-text .lead {
  margin-inline: 0;
}

.hub {
  position: relative;
  width: 100%;
  max-width: 32rem;
  aspect-ratio: 10 / 9;
  justify-self: end;
}

.hub-strands {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.hub-strands line {
  stroke-linecap: round;
  transform-box: view-box;
  transform-origin: var(--o);
}

.strands-main line {
  stroke: var(--color-primary);
  stroke-width: var(--strand-width);
}

.strands-fine line {
  stroke: var(--color-border);
  stroke-width: 1px;
}

.node {
  position: absolute;
  left: var(--x);
  top: var(--y);
  translate: -50% -50%;
  padding: var(--space-1) var(--space-3);
  border: var(--strand-width) solid var(--color-primary);
  border-radius: 999px;
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  font-size: var(--text-small);
  font-weight: 600;
  line-height: 1.4;
  white-space: nowrap;
}

.node-center {
  padding: var(--space-3) var(--space-5);
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  font-size: var(--text-body);
}

@media (prefers-reduced-motion: no-preference) {
  .strands-main line,
  .strands-fine line {
    animation: strand-grow var(--duration-enter) var(--ease-out) var(--d) both;
  }

  .node {
    animation: node-in var(--duration-enter) var(--ease-out) var(--d) both;
  }
}

/* Signals travel from each discipline into the hub; the hub pings on arrival */
.pulses circle {
  fill: var(--color-primary);
  opacity: 0;
  transform-box: view-box;
}

.node-center::after {
  content: "";
  position: absolute;
  inset: calc(-1 * var(--strand-width));
  border: var(--strand-width) solid var(--color-primary);
  border-radius: inherit;
  opacity: 0;
  pointer-events: none;
}

@media (prefers-reduced-motion: no-preference) {
  .hub.is-pulsing .pulses circle {
    animation: signal var(--duration-signal) cubic-bezier(0.5, 0, 0.3, 1) var(--pd) 3 both;
  }

  .hub.is-pulsing .node-center::after {
    animation: ping var(--duration-signal) var(--ease-out) 3;
  }
}

@keyframes signal {
  0% { opacity: 0; transform: translate(var(--x1), var(--y1)) scale(0.4); }
  15% { opacity: 1; transform: translate(var(--x1), var(--y1)) scale(1); }
  80% { opacity: 1; transform: translate(200px, 180px) scale(1); }
  100% { opacity: 0; transform: translate(200px, 180px) scale(0.4); }
}

@keyframes ping {
  0%, 70% { opacity: 0; transform: scale(1); }
  75% { opacity: 1; transform: scale(1); }
  100% { opacity: 0; transform: scale(1.35, 1.6); }
}

@keyframes strand-grow {
  from { opacity: 0; transform: scale(0); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes node-in {
  from { opacity: 0; transform: scale(0.85); }
  to { opacity: 1; transform: scale(1); }
}

/* Fade in once on entering the viewport. Only hidden when JS runs and motion is allowed. */
@media (prefers-reduced-motion: no-preference) {
  .js .reveal {
    transition: opacity var(--duration-enter) var(--ease-out), transform var(--duration-enter) var(--ease-out);
  }

  .js .reveal:not(.is-visible) {
    opacity: 0;
    transform: translateY(var(--space-2));
  }
}

/* Services as nodes on one strand */
.services-grid {
  position: relative;
  gap: var(--space-6);
  padding-left: var(--space-6);
}

.services-grid::before {
  content: "";
  position: absolute;
  top: calc(var(--space-4) + var(--node-size) / 2);
  bottom: 0;
  left: calc(var(--node-size) / 2 - 1px);
  width: var(--strand-width);
  background-color: var(--color-primary);
}

.service {
  position: relative;
  border-top: 0;
}

.service::before,
.step::before {
  content: "";
  position: absolute;
  width: var(--node-size);
  height: var(--node-size);
  border: var(--strand-width) solid var(--color-primary);
  border-radius: 50%;
  background-color: var(--color-background);
}

.service::before {
  top: calc(var(--space-4) + 0.3rem);
  left: calc(-1 * var(--space-6));
}

/* The services strand draws itself as you scroll; each node fills when reached.
   Browsers without scroll-driven animations show the finished drawing. */
@supports (animation-timeline: view()) {
  @media (prefers-reduced-motion: no-preference) {
    .services-grid {
      view-timeline: --services block;
    }

    .services-grid::before {
      transform-origin: top;
      animation: draw-y linear both;
      animation-timeline: --services;
      animation-range: entry 40% exit 10%;
    }

    .service {
      view-timeline: --service block;
    }

    .service::before {
      animation: node-fill linear both;
      animation-timeline: --service;
      animation-range: entry 55% entry 70%;
    }
  }
}

@keyframes draw-y {
  from { transform: scaleY(0); }
  to { transform: scaleY(1); }
}

@keyframes node-fill {
  from { background-color: var(--section-bg, var(--color-background)); transform: scale(0.6); }
  to { background-color: var(--color-primary); transform: scale(1); }
}

/* The page thread (wide screens): one strand through every section,
   with a knot at each heading that ties as the thread reaches it. */
main {
  position: relative;
}

.threaded {
  position: relative;
}

.thread {
  display: none;
}

@media (min-width: 80rem) {
  .thread {
    display: block;
    position: absolute;
    z-index: 1;
    top: calc(var(--space-8) + 1.4rem);
    bottom: 0;
    left: calc(50% - var(--max-width) / 2 - var(--space-5));
    width: var(--strand-width);
    background-color: var(--color-primary);
  }

  .threaded h2 {
    position: relative;
  }

  .threaded h2::before {
    content: "";
    position: absolute;
    z-index: 2;
    top: calc(0.575em - var(--node-size) / 2);
    left: calc(-1 * var(--space-7) - var(--node-size) / 2 + 1px);
    width: var(--node-size);
    height: var(--node-size);
    border: var(--strand-width) solid var(--color-primary);
    border-radius: 50%;
    background-color: var(--color-primary);
  }
}

@supports (animation-timeline: view()) {
  @media (min-width: 80rem) and (prefers-reduced-motion: no-preference) {
    .thread {
      transform-origin: top;
      animation: draw-y linear both;
      animation-timeline: view();
      animation-range: cover 40vh cover calc(100% - 60vh);
    }

    .threaded h2 {
      view-timeline: --knot block;
    }

    .threaded h2::before {
      animation: node-fill linear both;
      animation-timeline: --knot;
      animation-range: cover 40vh cover calc(40vh + 3rem);
    }
  }
}

.about,
.work,
.faq {
  --section-bg: var(--color-surface);
}

/* Evidence: anonymised outcome notes */
.work {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.outcomes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-7) var(--space-8);
  margin: var(--space-7) 0 0;
  padding: 0;
  list-style: none;
}

.outcome {
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
}

.outcome-sector {
  margin-bottom: var(--space-2);
  color: var(--color-text-muted);
  font-size: var(--text-small);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.outcome-figure {
  margin-bottom: var(--space-3);
  color: var(--color-primary);
  font-size: var(--text-h2);
  font-weight: 700;
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
}

.outcome-figure-unit {
  display: block;
  margin-top: var(--space-1);
  color: var(--color-text-secondary);
  font-size: var(--text-small);
  font-weight: 600;
  letter-spacing: 0;
}

.outcome h3 {
  margin-bottom: var(--space-4);
}

.outcome dl {
  margin: 0;
}

.outcome dt {
  font-weight: 600;
}

.outcome dd {
  margin: 0 0 var(--space-3);
  color: var(--color-text-secondary);
}

.outcome dd:last-child {
  margin-bottom: 0;
  color: var(--color-text-primary);
}

/* Engagement: three nodes on a connected path */
.steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
  margin: var(--space-7) 0 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.step {
  position: relative;
  padding-top: calc(var(--node-size) * 2 + var(--space-5));
  counter-increment: step;
}

.step::before {
  content: counter(step);
  top: 0;
  left: 0;
  display: grid;
  place-items: center;
  width: calc(var(--node-size) * 2);
  height: calc(var(--node-size) * 2);
  color: var(--color-text-primary);
  font-weight: 700;
  line-height: 1;
}

/* The strand to the next node */
.step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: calc(var(--node-size) - 1px);
  left: calc(var(--node-size) * 2);
  right: calc(-1 * var(--space-6));
  height: var(--strand-width);
  background-color: var(--color-primary);
}

.step h3 {
  margin-bottom: var(--space-2);
}

.step p {
  color: var(--color-text-secondary);
}

/* The path between steps grows once the steps come into view */
@media (prefers-reduced-motion: no-preference) {
  .step:not(:last-child)::after {
    transform-origin: left center;
    transition: transform var(--duration-signature) var(--ease-out);
  }

  .step:nth-child(2)::after {
    transition-delay: 350ms;
  }

  .js .steps:not(.is-visible) .step::after {
    transform: scaleX(0);
  }
}

/* FAQ */
.faq {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.faq h2 {
  margin-bottom: var(--space-6);
}

.faq details {
  border-top: 1px solid var(--color-border);
}

.faq details:last-of-type {
  border-bottom: 1px solid var(--color-border);
}

.faq summary {
  min-height: 2.75rem;
  padding: var(--space-4) 0;
  font-weight: 600;
  cursor: pointer;
}

.faq summary:hover {
  color: var(--color-primary);
}

.faq summary:active {
  color: var(--color-primary-active);
}

.faq details p {
  padding-bottom: var(--space-4);
  color: var(--color-text-secondary);
}

/* Contact band */
.contact {
  --color-focus: var(--color-on-primary-container);
  text-align: center;
  background-color: var(--color-primary-container);
  color: var(--color-on-primary-container);
}

.contact h2 {
  color: inherit;
}

.contact .lead {
  max-width: 44ch;
  margin: 0 auto var(--space-6);
}

.contact-address {
  margin-top: var(--space-5);
}

.contact-address a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--color-on-primary-container);
  font-weight: 600;
}

.contact-address a:hover {
  color: var(--color-on-primary-container-hover);
}

/* The knot: the logo's triangle ties itself in the contact band */
.knot {
  width: 7.5rem;
  height: auto;
  margin: 0 auto var(--space-6);
  overflow: visible;
}

.knot line,
.knot path {
  fill: none;
  stroke: var(--color-on-primary-container);
  stroke-width: 5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.knot-node {
  fill: var(--color-on-primary-container);
  transform-box: view-box;
}

.knot-strand {
  transform-box: view-box;
  transform-origin: var(--o);
}

@media (prefers-reduced-motion: no-preference) {
  .knot-node {
    transition: transform var(--duration-signature) var(--ease-out), opacity var(--duration-signature) var(--ease-out);
  }

  .knot-strand {
    transition: transform var(--duration-enter) var(--ease-out) var(--d), opacity var(--duration-enter) var(--ease-out) var(--d);
  }

  .knot-arrow {
    transition: transform var(--duration-signature) var(--ease-out) 620ms, opacity var(--duration-signature) var(--ease-out) 620ms;
  }

  .js .knot:not(.is-visible) .knot-node {
    opacity: 0;
    transform: translate(var(--from));
  }

  .js .knot:not(.is-visible) .knot-strand {
    opacity: 0;
    transform: scale(0);
  }

  .js .knot:not(.is-visible) .knot-arrow {
    opacity: 0;
    transform: translateX(-16px);
  }
}

/* Footer */
.site-footer {
  --color-focus: var(--color-text-on-inverse-strong);
  padding: var(--space-8) 0 var(--space-6);
  background-color: var(--color-surface-inverse);
  color: var(--color-text-on-inverse);
  font-size: var(--text-small);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-7);
}

.footer-brand img {
  height: 3.5rem;
  width: auto;
  margin-bottom: var(--space-4);
}

.footer-brand p {
  color: var(--color-text-on-inverse-strong);
  font-size: var(--text-body);
}

.footer-heading {
  margin-bottom: var(--space-3);
  font-size: var(--text-body);
  color: var(--color-text-on-inverse-strong);
}

.site-footer a {
  color: var(--color-text-on-inverse-strong);
}

.footer-legal p {
  margin-bottom: var(--space-1);
}

.footer-bottom {
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border-inverse);
}

/* 6. Responsive ------------------------------------------------------------ */

@media (max-width: 47.99rem) {
  .hero {
    padding: var(--space-8) 0;
  }

  .section {
    padding: var(--space-7) 0;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    padding: var(--space-4) var(--space-5) var(--space-5);
    background-color: var(--color-background);
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links.is-open {
    display: block;
    box-shadow: 0 var(--space-2) var(--space-5) rgba(26, 26, 26, 0.12);
  }

  .nav-links ul {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
  }

  .nav-links a:not(.btn) {
    width: 100%;
    padding: var(--space-2) 0;
  }

  .nav-links .btn {
    width: 100%;
    margin-top: var(--space-3);
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .hub {
    max-width: 22rem;
    justify-self: center;
  }

  .outcomes {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  /* Steps become a vertical path, like the services */
  .steps {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .step {
    padding-top: 0;
    padding-left: calc(var(--node-size) * 2 + var(--space-4));
  }

  @media (prefers-reduced-motion: no-preference) {
    .js .steps:not(.is-visible) .step::after {
      transform: scaleY(0);
    }
  }

  .step:not(:last-child)::after {
    transform-origin: center top;
    top: calc(var(--node-size) * 2);
    bottom: calc(-1 * var(--space-6));
    left: calc(var(--node-size) - 1px);
    right: auto;
    width: var(--strand-width);
    height: auto;
  }
}

@media (min-width: 48rem) and (max-width: 63.99rem) {
  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hub {
    justify-self: center;
  }
}