/* Yaya Tech and Innovations
   Colours are sampled from the logo; the 45° cut used on buttons and the
   process band comes from the angled ends of the Y mark. */

:root {
  --navy: #011745;
  --electric: #0054fb;
  --electric-deep: #0043cc;
  --sky: #00a8f7;
  --white: #ffffff;
  --mist: #f1f4fa;

  --bg: var(--white);
  --surface: var(--mist);
  --ink: var(--navy);
  --ink-soft: #46557c;
  --line: #d9e0ee;
  --link: #0047d6;
  --dim: #dfe5f0;
  --piece-navy: var(--navy);
  --field-bg: var(--white);

  --band: var(--navy);
  --band-ink: #ffffff;
  --band-soft: #a9b8dc;
  --band-line: rgba(255, 255, 255, 0.16);

  /* Piece colours used by the shared #yk-mark symbol */
  --yk-services: var(--sky);
  --yk-ai: var(--electric);
  --yk-software: var(--piece-navy);

  --font-display: "Unbounded", "Arial Black", system-ui, sans-serif;
  --font-body: "Figtree", system-ui, -apple-system, "Segoe UI", sans-serif;

  --step--1: 0.875rem;
  --step-0: 1.0625rem;
  --step-1: 1.25rem;
  --step-2: 1.5rem;
  --step-3: clamp(1.5rem, 1.2rem + 1vw, 1.875rem);
  --step-4: clamp(1.875rem, 1.35rem + 2.1vw, 3rem);
  --step-5: clamp(2.375rem, 1.5rem + 3.6vw, 4.5rem);

  --container: 1240px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --section: clamp(4.5rem, 10vw, 8.5rem);
  --header-h: 4.5rem;
  --radius: 8px;
  --cut: 12px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #010c2a;
    --surface: #03143a;
    --ink: #eef3ff;
    --ink-soft: #a8b5d6;
    --line: #1b2e5e;
    --link: #79adff;
    --dim: #233c78;
    --piece-navy: #e8eeff;
    --field-bg: #010c2a;

    --band: #061c52;
    --band-line: rgba(255, 255, 255, 0.14);
  }
}

/* Base */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
p,
ul,
ol,
dl,
dd,
figure {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 2px solid var(--electric);
  outline-offset: 3px;
  border-radius: 2px;
}

::selection {
  background: var(--electric);
  color: #fff;
}

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

.sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.container {
  width: 100%;
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--electric);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 1rem;
}

/* Type */

.section-title,
.hero__title {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.section-title {
  font-size: var(--step-4);
  line-height: 1.08;
}

.section-intro {
  margin-top: 1.25rem;
  max-width: 34em;
  color: var(--ink-soft);
  font-size: var(--step-1);
  line-height: 1.5;
  text-wrap: pretty;
}

.section {
  padding-block: var(--section);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1.5rem 4rem;
  align-items: end;
  margin-bottom: clamp(2.5rem, 6vw, 4.5rem);
}

.section-head .section-intro {
  margin-top: 0;
}

/* Buttons */

.btn {
  position: relative;
  isolation: isolate;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0 1.5rem;
  border: 0;
  border-radius: var(--radius);
  font: 600 1rem/1 var(--font-body);
  text-decoration: none;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background-color 0.2s;
}

/* The fill lives on a pseudo-element so the angled corner doesn't clip the focus ring. */
.btn--primary {
  color: #fff;
  background: none;
}

.btn--primary::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--electric);
  border-radius: inherit;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
  transition: background-color 0.2s;
}

.btn--primary:hover::before {
  background: var(--electric-deep);
}

.btn--ghost {
  color: var(--ink);
  box-shadow: inset 0 0 0 1.5px var(--line);
}

.btn--ghost:hover {
  box-shadow: inset 0 0 0 1.5px var(--ink);
}

/* Header */

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  height: var(--header-h);
}

.brand {
  display: block;
  color: var(--ink);
  flex-shrink: 0;
}

.brand__logo {
  height: 2.125rem;
  width: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2.25rem;
}

.site-nav ul {
  display: flex;
  gap: 1.75rem;
}

.site-nav ul a {
  color: var(--ink);
  font-weight: 500;
  font-size: 0.975rem;
  text-decoration: none;
  padding-block: 0.5rem;
  background: linear-gradient(var(--electric), var(--electric)) left bottom / 0 2px no-repeat;
  transition: background-size 0.25s var(--ease);
}

.site-nav ul a:hover {
  background-size: 100% 2px;
}

.site-nav__cta {
  min-height: 2.625rem;
  padding-inline: 1.15rem;
  font-size: 0.95rem;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.6rem;
  min-height: 2.75rem;
  padding: 0 0.9rem;
  border: 0;
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font: 600 0.95rem/1 var(--font-body);
  cursor: pointer;
}

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.25s var(--ease), opacity 0.2s;
}

.nav-toggle__bars {
  position: relative;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle__bars::before {
  top: -6px;
}

.nav-toggle__bars::after {
  top: 6px;
}

.site-header[data-open="true"] .nav-toggle__bars {
  background: transparent;
}

.site-header[data-open="true"] .nav-toggle__bars::before {
  transform: translateY(6px) rotate(45deg);
}

.site-header[data-open="true"] .nav-toggle__bars::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* Y mark (hero and practices) */

.ymark .pc-services {
  fill: var(--sky);
}

.ymark .pc-ai {
  fill: var(--electric);
}

.ymark .pc-software {
  fill: var(--piece-navy);
}

.ymark .pc {
  transition: transform 0.5s var(--ease), opacity 0.35s ease;
}

.ymark[data-active] .pc {
  opacity: 0.14;
}

.ymark[data-active="software"] .pc-software,
.ymark[data-active="ai"] .pc-ai,
.ymark[data-active="services"] .pc-services {
  opacity: 1;
}

.ymark[data-active="services"] .pc-services {
  transform: translate(-22px, -22px);
}

.ymark[data-active="ai"] .pc-ai {
  transform: translate(22px, -22px);
}

.ymark[data-active="software"] .pc-software {
  transform: translate(0, 20px);
}

/* One-time assembly on load: each piece slides in along its own axis. */
@keyframes yk-assemble {
  0% {
    transform: translate(var(--dx), var(--dy));
    opacity: 0;
  }
  45% {
    opacity: 1;
  }
  100% {
    transform: none;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .ymark--intro use {
    animation: yk-assemble 1.1s var(--ease) both;
  }

  .ymark--intro .pc-a { --dx: -110px; --dy: -110px; animation-delay: 0.1s; }
  .ymark--intro .pc-b { --dx: 110px; --dy: -110px; animation-delay: 0.22s; }
  .ymark--intro .pc-c { --dx: -60px; --dy: 90px; animation-delay: 0.34s; }
  .ymark--intro .pc-d { --dx: 0px; --dy: 120px; animation-delay: 0.4s; }
  .ymark--intro .pc-e { --dx: 60px; --dy: 90px; animation-delay: 0.46s; }
}

/* Small "where it sits in the Y" glyph */

.glyph {
  --yk-services: var(--dim);
  --yk-ai: var(--dim);
  --yk-software: var(--dim);
  width: 2.75rem;
  height: auto;
  flex-shrink: 0;
}

.glyph[data-lit~="services"] {
  --yk-services: var(--sky);
}

.glyph[data-lit~="ai"] {
  --yk-ai: var(--electric);
}

.glyph[data-lit~="software"] {
  --yk-software: var(--piece-navy);
}

/* Hero */

.hero {
  padding-top: calc(var(--header-h) + clamp(2.5rem, 7vw, 6rem));
  overflow: hidden;
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: clamp(2.5rem, 6vw, 6rem);
  align-items: center;
}

.hero__title {
  font-size: var(--step-5);
  line-height: 1.02;
  letter-spacing: -0.035em;
}

.hero__lede {
  margin-top: 1.75rem;
  max-width: 31em;
  color: var(--ink-soft);
  font-size: clamp(1.125rem, 1rem + 0.45vw, 1.3125rem);
  line-height: 1.55;
  text-wrap: pretty;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
  margin-top: 2.25rem;
}

.hero__visual {
  justify-self: end;
  width: 100%;
  max-width: 600px;
}

.hero__visual .ymark {
  width: 100%;
  height: auto;
  overflow: visible;
}

.hero__key {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: clamp(3.5rem, 8vw, 6.5rem);
  border-top: 1px solid var(--line);
}

.key-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 1rem;
  align-items: center;
  height: 100%;
  padding: 1.75rem 1.5rem 2.25rem;
  color: var(--ink);
  text-decoration: none;
  transition: background-color 0.25s;
}

.hero__key li + li .key-item {
  border-left: 1px solid var(--line);
}

.hero__key li:first-child .key-item {
  padding-left: 0;
}

.key-item:hover {
  background: var(--surface);
}

.hero__key li:first-child .key-item:hover {
  background: linear-gradient(90deg, transparent, var(--surface) 3rem);
}

.key-item .glyph {
  grid-row: span 2;
  width: 3.25rem;
}

.key-item__name {
  font-weight: 600;
  font-size: 1.125rem;
  line-height: 1.3;
}

.key-item__desc {
  color: var(--ink-soft);
  font-size: 0.9375rem;
  line-height: 1.45;
}

/* Practices */

.practices__layout {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(2.5rem, 7vw, 7rem);
}

.practices__aside {
  position: sticky;
  top: calc(var(--header-h) + 2.5rem);
  align-self: start;
}

.practices__mark {
  width: min(100%, 340px);
  height: auto;
  margin-top: clamp(2.5rem, 5vw, 4rem);
  overflow: visible;
}

.practice {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-block: 2.75rem 3.25rem;
  border-top: 1px solid var(--line);
}

.practice:first-child {
  padding-top: 0;
  border-top: 0;
}

.practice__glyph {
  display: none;
}

.practice__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--step-3);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.practice__lead {
  margin-top: 1rem;
  max-width: 34em;
  font-size: var(--step-1);
  line-height: 1.5;
  text-wrap: pretty;
}

.practice__items {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.875rem 2rem;
  margin-top: 2rem;
}

.practice__items li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--ink-soft);
  line-height: 1.45;
}

/* Bullet: a small block with one corner cut at 45°, like the ends of the mark */
.practice__items li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 0.5rem;
  height: 0.5rem;
  background: var(--practice-colour, var(--ink));
  clip-path: polygon(0 0, 100% 0, 100% 45%, 45% 100%, 0 100%);
}

.practice[data-practice="software"] {
  --practice-colour: var(--piece-navy);
}

.practice[data-practice="ai"] {
  --practice-colour: var(--electric);
}

.practice[data-practice="services"] {
  --practice-colour: var(--sky);
}

/* Scenarios ledger */

.scenarios {
  background: var(--surface);
}

.ledger__labels,
.ledger__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1rem clamp(2rem, 6vw, 6rem);
}

.ledger__labels {
  padding-bottom: 1rem;
  color: var(--ink-soft);
  font-size: var(--step--1);
  font-weight: 600;
  border-bottom: 1.5px solid var(--ink);
}

.ledger__row {
  padding-block: 2rem;
  border-bottom: 1px solid var(--line);
}

.ledger__row dt {
  font-size: clamp(1.1875rem, 1.05rem + 0.5vw, 1.4375rem);
  font-weight: 500;
  line-height: 1.38;
  letter-spacing: -0.01em;
  text-wrap: pretty;
}

.ledger__row dd p {
  color: var(--ink-soft);
  text-wrap: pretty;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-top: 0.875rem;
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--ink);
}

.tag .glyph {
  width: 1.75rem;
}

/* Process band */

.band {
  --cut-lg: clamp(28px, 5vw, 72px);
  background: var(--band);
  color: var(--band-ink);
  clip-path: polygon(var(--cut-lg) 0, 100% 0, 100% 100%, 0 100%, 0 var(--cut-lg));
}

.band .section-intro {
  color: var(--band-soft);
}

.band :focus-visible {
  outline-color: var(--sky);
}

.steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 2rem;
  counter-reset: step;
}

.step {
  position: relative;
  display: flex;
  flex-direction: column;
  padding-top: 1.75rem;
  border-top: 1px solid var(--band-line);
}

.step::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 2.5rem;
  height: 3px;
  background: var(--sky);
}

.step__num {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 2.5rem;
  line-height: 1;
  color: var(--sky);
}

.step__title {
  margin-top: 1.25rem;
  font-size: var(--step-1);
  font-weight: 600;
  line-height: 1.3;
}

.step p {
  margin-top: 0.625rem;
  color: var(--band-soft);
  font-size: 0.975rem;
  line-height: 1.55;
}

.step .step__result {
  margin-top: auto;
  padding-top: 1.5rem;
  color: var(--band-ink);
}

.step__result span {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--sky);
  font-size: var(--step--1);
  font-weight: 600;
}

/* About */

.about__layout {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(2.5rem, 7vw, 7rem);
}

.about__story p {
  margin-top: 1.25rem;
  max-width: 32em;
  color: var(--ink-soft);
  font-size: var(--step-1);
  line-height: 1.55;
  text-wrap: pretty;
}

.about__story p:first-of-type {
  margin-top: 1.75rem;
  color: var(--ink);
}

.promises {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(2rem, 4vw, 3.5rem);
}

.promises li {
  padding-block: 1.75rem 2.25rem;
  border-top: 1.5px solid var(--ink);
}

.promises li:nth-child(n + 3) {
  border-top-width: 1px;
  border-top-color: var(--line);
}

.promises h3 {
  font-size: var(--step-1);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.promises p {
  margin-top: 0.625rem;
  color: var(--ink-soft);
  line-height: 1.55;
}

/* Engagement models */

.engage {
  padding-top: 0;
}

.engage__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-rows: repeat(4, auto);
  border-top: 1.5px solid var(--ink);
}

.model {
  display: grid;
  grid-row: span 4;
  grid-template-rows: subgrid;
  row-gap: 0;
  padding: 1.75rem clamp(1.25rem, 3vw, 2.5rem) 0;
}

.model + .model {
  border-left: 1px solid var(--line);
}

.model:first-child {
  padding-left: 0;
}

.model__name {
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 600;
  letter-spacing: -0.02em;
  padding-bottom: 1.25rem;
}

.model p {
  padding-block: 1.125rem;
  border-top: 1px solid var(--line);
  line-height: 1.5;
}

.model__label {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--ink-soft);
  font-size: var(--step--1);
  font-weight: 600;
}

/* FAQ */

.faq {
  background: var(--surface);
}

.faq__layout {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(2.5rem, 7vw, 7rem);
  align-items: start;
}

.faq__list {
  border-top: 1.5px solid var(--ink);
}

.faq details {
  border-bottom: 1px solid var(--line);
}

.faq summary {
  position: relative;
  display: block;
  padding: 1.5rem 3rem 1.5rem 0;
  font-size: clamp(1.0625rem, 1rem + 0.3vw, 1.1875rem);
  font-weight: 600;
  line-height: 1.4;
  cursor: pointer;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::before,
.faq summary::after {
  content: "";
  position: absolute;
  right: 0.5rem;
  top: 50%;
  width: 14px;
  height: 2px;
  background: var(--electric);
  border-radius: 2px;
  transition: transform 0.3s var(--ease);
}

.faq summary::after {
  transform: rotate(90deg);
}

.faq details[open] summary::after {
  transform: rotate(0deg);
}

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

.faq__answer {
  padding: 0 3rem 1.75rem 0;
  color: var(--ink-soft);
  max-width: 40em;
}

@media (prefers-reduced-motion: no-preference) {
  .faq details {
    interpolate-size: allow-keywords;
  }

  .faq details::details-content {
    height: 0;
    overflow: clip;
    transition: height 0.35s var(--ease), content-visibility 0.35s allow-discrete;
  }

  .faq details[open]::details-content {
    height: auto;
  }
}

/* Contact */

.contact__layout {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(2.5rem, 7vw, 7rem);
  align-items: start;
}

.contact__direct {
  margin-top: 2rem;
  color: var(--ink-soft);
}

.contact__direct a {
  display: inline-block;
  margin-top: 0.25rem;
  font-weight: 600;
  font-size: var(--step-1);
  overflow-wrap: anywhere;
}

.contact-form {
  display: grid;
  gap: 1.5rem;
}

.field-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
}

.field {
  display: grid;
  gap: 0.5rem;
  min-width: 0;
}

fieldset.field {
  margin: 0;
  padding: 0;
  border: 0;
}

.field label,
.field legend {
  padding: 0;
  font-weight: 600;
  font-size: 0.975rem;
}

.field legend {
  margin-bottom: 0.5rem;
}

.field__optional {
  color: var(--ink-soft);
  font-weight: 400;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  min-height: 3rem;
  padding: 0.75rem 0.9rem;
  background: var(--field-bg);
  color: var(--ink);
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  font: inherit;
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.field textarea {
  resize: vertical;
  min-height: 8.5rem;
}

.field select {
  appearance: none;
  padding-right: 2.5rem;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--ink-soft) 50%),
    linear-gradient(135deg, var(--ink-soft) 50%, transparent 50%);
  background-position: calc(100% - 1.25rem) 55%, calc(100% - 0.9rem) 55%;
  background-size: 6px 6px;
  background-repeat: no-repeat;
}

.field input:hover,
.field select:hover,
.field textarea:hover {
  border-color: var(--ink-soft);
}

.field input:focus-visible,
.field select:focus-visible,
.field textarea:focus-visible {
  outline: none;
  border-color: var(--electric);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--electric) 25%, transparent);
}

.field [aria-invalid="true"] {
  border-color: #c4253c;
}

.field__hint {
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.field__error {
  color: #c4253c;
  font-size: 0.9rem;
  font-weight: 500;
}

.field__error:empty {
  display: none;
}

@media (prefers-color-scheme: dark) {
  .field [aria-invalid="true"] {
    border-color: #ff7a8c;
  }

  .field__error {
    color: #ff9aa8;
  }
}

.choices__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
}

.choice {
  position: relative;
}

.choice input {
  position: absolute;
  opacity: 0;
  inset: 0;
  margin: 0;
  cursor: pointer;
}

.choice span {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  min-height: 2.875rem;
  padding: 0.5rem 1rem;
  background: var(--field-bg);
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 0.975rem;
  transition: border-color 0.2s, background-color 0.2s;
}

.choice .glyph {
  width: 1.6rem;
}

.choice:hover span {
  border-color: var(--ink-soft);
}

.choice input:checked + span {
  border-color: var(--electric);
  background: color-mix(in srgb, var(--electric) 9%, var(--field-bg));
}

.choice input:focus-visible + span {
  outline: 2px solid var(--electric);
  outline-offset: 2px;
}

.contact-form__footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.5rem;
  margin-top: 0.5rem;
}

.contact-form__footer .btn {
  min-height: 3.25rem;
  padding-inline: 2rem;
}

.contact-form__status {
  flex: 1 1 16rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.contact-form__status.is-error {
  color: #c4253c;
}

.contact-form__status.is-success {
  color: var(--ink);
  font-weight: 500;
}

/* Footer */

.site-footer {
  --yk-software: #ffffff;
  background: var(--band);
  color: #ffffff;
  padding-block: clamp(3.5rem, 7vw, 5.5rem) 2rem;
}

@media (prefers-color-scheme: dark) {
  .site-footer {
    background: #000822;
    border-top: 1px solid var(--line);
  }
}

.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: 3rem clamp(2.5rem, 7vw, 7rem);
}

.site-footer__logo {
  width: min(100%, 280px);
  height: auto;
}

.site-footer__brand p {
  margin-top: 1.5rem;
  max-width: 22em;
  color: var(--band-soft);
}

.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, auto));
  gap: 2rem;
  justify-content: space-between;
}

.site-footer__nav h2 {
  margin-bottom: 1rem;
  color: var(--band-soft);
  font-size: var(--step--1);
  font-weight: 600;
}

.site-footer__nav li + li {
  margin-top: 0.6rem;
}

.site-footer__nav a {
  color: #ffffff;
  text-decoration: none;
}

.site-footer__nav a[data-contact-email] {
  white-space: nowrap;
}

.site-footer__nav a:hover {
  text-decoration: underline;
}

.site-footer :focus-visible {
  outline-color: var(--sky);
}

.site-footer__legal {
  grid-column: 1 / -1;
  padding-top: 2rem;
  border-top: 1px solid var(--band-line);
  color: var(--band-soft);
  font-size: var(--step--1);
}

/* Responsive */

@media (max-width: 1100px) {
  .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    row-gap: 3rem;
  }

  .site-nav ul {
    gap: 1.25rem;
  }

  .site-nav {
    gap: 1.5rem;
  }
}

@media (max-width: 960px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 1.5rem;
    padding: 1rem var(--gutter) 1.75rem;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 40px -24px rgba(1, 23, 69, 0.25);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 0.2s, transform 0.25s var(--ease), visibility 0s 0.25s;
  }

  .site-header[data-open="true"] .site-nav {
    visibility: visible;
    opacity: 1;
    transform: none;
    transition: opacity 0.2s, transform 0.25s var(--ease), visibility 0s;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 0;
  }

  .site-nav ul a {
    display: block;
    padding-block: 0.875rem;
    font-size: 1.125rem;
    border-bottom: 1px solid var(--line);
    background: none;
  }

  .site-nav__cta {
    min-height: 3rem;
  }

  .hero__grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero__visual {
    justify-self: start;
    max-width: 440px;
  }

  .hero__key {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero__key li + li .key-item {
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .key-item,
  .hero__key li:first-child .key-item {
    padding: 1.25rem 0;
  }

  .key-item:hover,
  .hero__key li:first-child .key-item:hover {
    background: none;
  }

  .key-item:hover .key-item__name {
    color: var(--link);
  }

  .section-head,
  .practices__layout,
  .about__layout,
  .faq__layout,
  .contact__layout,
  .site-footer__inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .practices__aside {
    position: static;
  }

  .practices__mark {
    display: none;
  }

  .practice__glyph {
    display: block;
    width: 3.5rem;
    margin-bottom: 1.25rem;
  }

  .practice:first-child {
    padding-top: 0.5rem;
  }

  .engage__grid {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: none;
  }

  .model {
    grid-row: auto;
    grid-template-rows: none;
    padding: 1.75rem 0 1rem;
  }

  .model + .model {
    border-left: 0;
    border-top: 1.5px solid var(--ink);
  }
}

@media (max-width: 720px) {
  .steps {
    grid-template-columns: minmax(0, 1fr);
    row-gap: 2.5rem;
  }

  .step {
    display: grid;
    grid-template-columns: 3.25rem minmax(0, 1fr);
    column-gap: 1rem;
  }

  .step > :not(.step__num) {
    grid-column: 2;
  }

  .step__num {
    grid-row: span 3;
    font-size: 2rem;
  }

  .step__title {
    margin-top: 0;
  }

  .step .step__result {
    padding-top: 1rem;
  }

  .practice__items,
  .promises,
  .field-row {
    grid-template-columns: minmax(0, 1fr);
  }

  .ledger__labels {
    display: none;
  }

  .ledger__row {
    grid-template-columns: minmax(0, 1fr);
    padding-block: 1.75rem;
  }

  .ledger__rows {
    border-top: 1.5px solid var(--ink);
  }

  .promises li:nth-child(2) {
    border-top-width: 1px;
    border-top-color: var(--line);
  }

  .site-footer__nav {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .site-footer__nav > :last-child {
    grid-column: 1 / -1;
  }

  .hero__visual {
    max-width: 320px;
  }

  .faq__answer {
    padding-right: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}