:root {
  color-scheme: light;
  --font-sans: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", "SF Mono", Consolas, monospace;
  --bg: #fbfbfe;
  --bg-tinted: #f6f4ff;
  --surface: #ffffff;
  --surface-soft: #faf9ff;
  --text: #121019;
  --text-muted: #5f5a6d;
  --text-soft: #8f899d;
  --accent: #7451d8;
  --accent-strong: #5d35c8;
  --accent-soft: #eee9ff;
  --border: #e5e1f2;
  --border-strong: #d7d0ea;
  --logo-surface: #ffffff;
  --logo-surface-hover: #fbfaff;
  --logo-border: #e5e1f2;
  --shadow: 0 16px 36px rgba(42, 32, 77, 0.07);
  --shadow-strong: 0 22px 52px rgba(42, 32, 77, 0.11);
  --radius: 8px;
  --shell: 1120px;
  --section: 104px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

:root[data-mode="dark"] {
  color-scheme: dark;
  --bg: #111116;
  --bg-tinted: #171621;
  --surface: #1a1922;
  --surface-soft: #201e2c;
  --text: #f5f4fb;
  --text-muted: #c8c3d7;
  --text-soft: #948da8;
  --accent: #a993ff;
  --accent-strong: #c0b2ff;
  --accent-soft: #2a2440;
  --border: #312d42;
  --border-strong: #453f5c;
  --logo-surface: #f7f6fb;
  --logo-surface-hover: #ffffff;
  --logo-border: #d8d2e8;
  --shadow: 0 16px 38px rgba(0, 0, 0, 0.24);
  --shadow-strong: 0 22px 56px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  transition: background-color 220ms var(--ease), color 220ms var(--ease);
}

button,
input,
textarea,
select {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
}

[hidden] {
  display: none !important;
}

p,
li {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.7;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

h1,
h2,
h3,
h4 {
  color: var(--text);
  font-weight: 600;
  letter-spacing: 0;
}

h1 {
  font-size: 4rem;
  line-height: 1;
  margin-bottom: 1.2rem;
}

h2 {
  font-size: 3rem;
  line-height: 1.08;
  margin-bottom: 1rem;
  max-width: 20ch;
}

h3 {
  font-size: 1.25rem;
  line-height: 1.25;
  margin-bottom: 0.7rem;
}

h4 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  margin-bottom: 0.45rem;
  text-transform: uppercase;
}

.site-header {
  align-items: center;
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  border-bottom: 1px solid var(--border);
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr auto auto;
  min-height: 74px;
  padding: 0 28px;
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand {
  display: inline-grid;
  gap: 2px;
  width: fit-content;
}

.brand__name {
  color: var(--text);
  font-weight: 700;
}

.brand__role,
.meta-label,
.kicker,
.card__index,
.text-links,
.proof-toggle,
.theme-toggle {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0;
}

.brand__role {
  color: var(--text-soft);
}

.nav {
  align-items: center;
  display: flex;
  gap: 4px;
}

.nav__link {
  border-radius: var(--radius);
  color: var(--text-muted);
  padding: 0.58rem 0.72rem;
  transition: background-color 180ms var(--ease), color 180ms var(--ease);
}

.nav__link:hover,
.nav__link:focus-visible {
  background: var(--accent-soft);
  color: var(--text);
  outline: none;
}

.theme-toggle {
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  color: var(--text);
  cursor: pointer;
  display: inline-flex;
  gap: 0.5rem;
  height: 38px;
  justify-content: center;
  padding: 0 0.82rem;
  transition: border-color 180ms var(--ease), transform 180ms var(--ease), background-color 180ms var(--ease);
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  background: var(--accent-soft);
  border-color: var(--accent);
  outline: none;
  transform: translateY(-1px);
}

.theme-toggle__mark {
  background: var(--accent);
  border-radius: 999px;
  height: 8px;
  width: 8px;
}

.section {
  padding: var(--section) 28px;
}

.section--tinted {
  background: var(--bg-tinted);
}

.shell {
  margin: 0 auto;
  max-width: var(--shell);
}

.hero {
  min-height: auto;
  padding-bottom: 56px;
  padding-top: 76px;
}

.hero__grid {
  align-items: center;
  display: grid;
  gap: 54px;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
}

.hero__content {
  max-width: 720px;
}

.kicker,
.meta-label {
  color: var(--accent);
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.hero__title {
  color: var(--text);
  font-size: 1.28rem;
  line-height: 1.55;
  margin-bottom: 1.2rem;
  max-width: 58ch;
}

.hero__intro,
.section-heading > p,
.about__copy p {
  font-size: 1.08rem;
  line-height: 1.72;
  max-width: 62ch;
}

.hero__proof {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

.proof-toggle {
  align-items: center;
  background: transparent;
  border: 0;
  color: var(--accent);
  display: none;
  justify-content: space-between;
  padding: 0;
  text-transform: uppercase;
  width: 100%;
}

.proof-toggle__icon {
  font-size: 1rem;
  line-height: 1;
}

.proof-label {
  display: block;
}

.logo-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.logo-tile {
  align-items: center;
  background: var(--logo-surface);
  border: 1px solid var(--logo-border);
  border-radius: var(--radius);
  display: flex;
  height: 92px;
  justify-content: center;
  margin: 0;
  overflow: hidden;
  padding: 18px;
  transition: background-color 180ms var(--ease), border-color 180ms var(--ease), box-shadow 180ms var(--ease), transform 180ms var(--ease);
}

.logo-tile:hover {
  background: var(--logo-surface-hover);
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.logo-tile__image {
  display: block;
  max-height: 32px;
  object-fit: contain;
  width: auto;
}

.logo-tile__image--thomson-reuters {
  max-height: 46px;
  transform: scale(1.36);
}

.logo-tile__image--paypal {
  max-height: 34px;
}

.logo-tile__image--walmart {
  max-height: 42px;
  transform: scale(1.22);
}

.logo-tile__image--microsoft {
  max-height: 52px;
  transform: scale(1.58);
}

:root[data-mode="dark"] .logo-tile__image {
  filter: none;
}

.section-heading {
  margin-bottom: 34px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  transition: border-color 180ms var(--ease), box-shadow 180ms var(--ease), transform 180ms var(--ease);
}

.card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-strong);
  transform: translateY(-2px);
}

.what-grid,
.experiment-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card__index {
  color: var(--accent);
  margin-bottom: 1rem;
}

.impact-list {
  display: grid;
  gap: 18px;
}

.impact-card {
  display: grid;
  gap: 0;
}

.impact-card[data-open="true"] {
  border-color: var(--accent);
}

.impact-card__summary {
  display: grid;
  gap: 0.4rem;
}

.detail-toggle {
  align-items: center;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  color: white;
  cursor: pointer;
  display: inline-flex;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  font-weight: 600;
  gap: 0.85rem;
  justify-content: space-between;
  margin-top: 0.85rem;
  padding: 0.76rem 0.9rem;
  width: fit-content;
  transition: background-color 180ms var(--ease), border-color 180ms var(--ease), transform 180ms var(--ease);
}

.detail-toggle:hover,
.detail-toggle:focus-visible {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  outline: none;
  transform: translateY(-1px);
}

.detail-toggle__icon {
  font-size: 1rem;
  line-height: 1;
}

.impact-card__details {
  display: grid;
  grid-template-rows: 0fr;
  margin-top: 0;
  opacity: 0;
  transition: grid-template-rows 320ms var(--ease), margin-top 320ms var(--ease), opacity 240ms var(--ease);
}

.impact-card[data-open="true"] .impact-card__details {
  grid-template-rows: 1fr;
  margin-top: 22px;
  opacity: 1;
}

.impact-card__details-inner {
  border-top: 1px solid var(--border);
  display: grid;
  gap: 20px;
  min-height: 0;
  overflow: hidden;
  padding-top: 22px;
}

.detail-section p:last-child,
.detail-section li:last-child,
.card p:last-child,
.principle p:last-child {
  margin-bottom: 0;
}

.detail-section ul {
  margin: 0.8rem 0 0;
  padding-left: 1.2rem;
}

.text-links {
  color: var(--accent);
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 22px;
}

.text-links a,
.text-links span {
  border-bottom: 1px solid var(--border-strong);
  padding-bottom: 0.14rem;
}

.text-links a {
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.text-links a:hover,
.text-links a:focus-visible {
  border-color: var(--accent);
  color: var(--accent-strong);
  outline: none;
}

.principles {
  display: grid;
  gap: 0;
}

.principle {
  border-top: 1px solid var(--border);
  display: grid;
  gap: 0.35rem;
  grid-template-columns: minmax(200px, 0.8fr) minmax(0, 1fr) minmax(0, 1.15fr);
  padding: 26px 0;
}

.principle:last-child {
  border-bottom: 1px solid var(--border);
}

.principle__practice {
  color: var(--text);
  font-style: italic;
}

.about {
  display: grid;
  gap: 30px;
  grid-template-columns: minmax(260px, 0.7fr) minmax(0, 1fr);
}

.about__copy {
  display: grid;
  gap: 1rem;
}

.footer {
  border-top: 1px solid var(--border);
  padding: 34px 28px;
}

.footer__inner {
  align-items: center;
  display: flex;
  gap: 20px;
  justify-content: space-between;
}

.footer p {
  color: var(--text-soft);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  margin: 0;
}

@media (max-width: 920px) {
  h1 {
    font-size: 3.3rem;
  }

  h2 {
    font-size: 2.2rem;
  }

  .site-header {
    align-items: start;
    grid-template-columns: 1fr auto;
    padding-bottom: 16px;
    padding-top: 16px;
  }

  .nav {
    grid-column: 1 / -1;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero {
    min-height: auto;
  }

  .hero__grid,
  .about,
  .principle {
    grid-template-columns: 1fr;
  }

  .hero__proof {
    padding: 18px;
  }

  .proof-toggle {
    display: flex;
  }

  .proof-label {
    display: none;
  }

  .proof-panel {
    display: grid;
    grid-template-rows: 0fr;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: grid-template-rows 280ms var(--ease), margin-top 280ms var(--ease), opacity 220ms var(--ease);
  }

  .hero__proof[data-open="true"] .proof-panel {
    grid-template-rows: 1fr;
    margin-top: 18px;
    opacity: 1;
  }

  .logo-grid {
    min-height: 0;
    overflow: hidden;
  }

  .what-grid,
  .experiment-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 620px) {
  :root {
    --section: 72px;
  }

  h1 {
    font-size: 2.65rem;
  }

  h2 {
    font-size: 1.9rem;
  }

  .site-header,
  .section,
  .footer {
    padding-left: 18px;
    padding-right: 18px;
  }

  .logo-grid {
    grid-template-columns: 1fr;
  }

  .footer__inner {
    align-items: start;
    flex-direction: column;
  }
}