:root {
  color-scheme: light dark;
  --bg: #f7f5f0;
  --surface: #ffffff;
  --ink: #18181a;
  --muted: #55565b;
  --line: #dcd8ce;
  --accent: #0f5c4d;
  --accent-soft: #e2eee8;
  --code-bg: #eeebe3;
  --wrap: 68rem;
  --measure: 42rem;
  --radius: 12px;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111315;
    --surface: #181b1e;
    --ink: #ecebe6;
    --muted: #a8aaad;
    --line: #2d3135;
    --accent: #6fd3bb;
    --accent-soft: #15302a;
    --code-bg: #20252a;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 1.0625rem/1.65 var(--sans);
}

h1,
h2,
h3 {
  line-height: 1.15;
  text-wrap: balance;
  overflow-wrap: break-word;
}

p,
li,
dd {
  text-wrap: pretty;
}

a {
  color: var(--accent);
  text-underline-offset: 0.2em;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

main:focus {
  outline: none;
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--code-bg);
  border-radius: 6px;
  padding: 0.15em 0.4em;
  overflow-wrap: anywhere;
}

var {
  font-family: var(--mono);
  font-style: normal;
  font-size: 0.95em;
}

.wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 10;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--bg);
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
}

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

/* Header */

.site-header {
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 1rem;
}

.brand,
.brand-text {
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.brand {
  text-decoration: none;
}

.brand span {
  color: var(--accent);
}

.site-header ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.95rem;
}

.site-header nav a {
  display: inline-block;
  padding-block: 0.35rem;
  color: var(--muted);
  text-decoration: none;
}

.site-header nav a:hover {
  color: var(--ink);
  text-decoration: underline;
}

/* Hero */

.hero {
  padding-block: clamp(3.5rem, 10vw, 7.5rem) clamp(3rem, 8vw, 6rem);
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

h1 {
  max-width: 15ch;
  margin: 0;
  font-size: clamp(2.5rem, 4.5vw + 1.25rem, 4.75rem);
  line-height: 1.04;
  letter-spacing: -0.03em;
}

.lede {
  max-width: var(--measure);
  margin: 1.75rem 0 0;
  color: var(--muted);
  font-size: clamp(1.125rem, 0.5vw + 1rem, 1.3rem);
}

.motto {
  margin: 2.5rem 0 0;
  padding-left: 1.25rem;
  border-left: 3px solid var(--accent);
  font-size: clamp(1.15rem, 1vw + 0.9rem, 1.45rem);
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: -0.01em;
}

.motto span {
  display: block;
}

/* Sections */

.section {
  padding-block: clamp(3rem, 8vw, 5.5rem);
  border-top: 1px solid var(--line);
}

.section-head {
  max-width: var(--measure);
  margin-bottom: 2.5rem;
}

.section-head h2 {
  margin: 0;
  font-size: clamp(1.75rem, 2vw + 1rem, 2.5rem);
  letter-spacing: -0.02em;
}

.section-head h2 + p {
  margin: 1rem 0 0;
  color: var(--muted);
}

h3 {
  margin: 0;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}

/* Tasks vs responsibilities */

.compare {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
  gap: 1rem;
}

.card {
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.card-accent {
  border-color: var(--accent);
  box-shadow: inset 0 3px 0 var(--accent);
}

.card dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.75rem 1.25rem;
  margin: 1.25rem 0 0;
}

.card dt {
  color: var(--muted);
  font-size: 0.9rem;
  padding-top: 0.1rem;
}

.card dd {
  margin: 0;
}

/* Principles */

.principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: principle;
}

.principles li {
  counter-increment: principle;
  padding-top: 1.25rem;
  border-top: 3px solid var(--ink);
}

.principles li::before {
  content: counter(principle, decimal-leading-zero);
  content: counter(principle, decimal-leading-zero) / "";
  display: block;
  margin-bottom: 0.75rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.85rem;
}

.principles p {
  margin: 0.75rem 0 0;
  color: var(--muted);
}

/* Flow: signals -> case instructions -> cases */

.flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.flow li {
  position: relative;
  padding: clamp(1.25rem, 2.5vw, 1.75rem);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* Arrow between steps, drawn with borders so it has no text to announce. */
.flow li + li::before {
  content: "";
  position: absolute;
  top: 50%;
  left: -1.95rem;
  width: 0.9rem;
  height: 0.9rem;
  border-top: 3px solid var(--accent);
  border-right: 3px solid var(--accent);
  transform: translateY(-50%) rotate(45deg);
}

.flow .tag,
.example-card .tag {
  display: inline-block;
  margin: 0 0 0.9rem;
  padding: 0.15rem 0.6rem;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 0.8rem;
}

.flow li > p:last-child {
  margin: 0.6rem 0 0;
  color: var(--muted);
}

@media (max-width: 56rem) {
  .flow {
    grid-template-columns: 1fr;
    gap: 2.75rem;
  }

  .flow li + li::before {
    top: -1.85rem;
    left: 50%;
    transform: translateX(-50%) rotate(135deg);
  }
}

/* Example */

.spec {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.spec figcaption {
  padding: 0.9rem clamp(1.25rem, 3vw, 2rem);
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.85rem;
}

.spec dl {
  margin: 0;
}

.spec dl > div {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 0.25rem 1.5rem;
  padding: 1rem clamp(1.25rem, 3vw, 2rem);
  border-top: 1px solid var(--line);
}

.spec dl > div:first-child {
  border-top: 0;
}

.spec dt {
  color: var(--muted);
  font-size: 0.9rem;
  padding-top: 0.1rem;
}

.spec dd {
  margin: 0;
}

.spec dd code {
  display: inline-block;
  margin-top: 0.4rem;
}

.spec blockquote {
  margin: 0;
  padding-left: 1rem;
  border-left: 3px solid var(--line);
  color: var(--muted);
}

.spec blockquote p {
  margin: 0;
}

@media (max-width: 40rem) {
  .spec dl > div {
    grid-template-columns: 1fr;
  }
}

.subhead {
  margin: 3rem 0 1.25rem;
}

.steps {
  max-width: var(--measure);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.steps li {
  position: relative;
  counter-increment: step;
  padding-left: 2.75rem;
}

.steps li + li {
  margin-top: 1rem;
}

.steps li::before {
  content: counter(step);
  content: counter(step) / "";
  position: absolute;
  left: 0;
  top: 0.1rem;
  display: grid;
  place-items: center;
  width: 1.75rem;
  height: 1.75rem;
  border: 1.5px solid var(--accent);
  border-radius: 50%;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.85rem;
}

/* More examples: label above value, since the labels are long */

.example-card .intent {
  margin: 0.6rem 0 0;
  color: var(--muted);
}

.example-card dl {
  display: block;
}

.example-card dt {
  padding-top: 0;
}

.example-card dt + dd {
  margin-top: 0.25rem;
}

.example-card dd + dt {
  margin-top: 1rem;
}

/* Accountability */

.columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
  gap: 2rem clamp(2rem, 5vw, 4rem);
}

.columns ul {
  margin: 1rem 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

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

.columns li::marker {
  color: var(--accent);
}

/* Impressum */

.legal {
  display: block;
  padding-block: clamp(3rem, 8vw, 5.5rem);
}

.legal h1 {
  font-size: clamp(2.25rem, 3vw + 1.25rem, 3.25rem);
}

.legal h2 {
  margin: 2.5rem 0 0;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}

.legal address,
.legal h2 + p {
  margin: 0.75rem 0 0;
  font-style: normal;
}

/* Footer */

.site-footer {
  padding-block: 2rem 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.95rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
}

.site-footer p {
  margin: 0;
}

@media print {
  .site-header nav,
  .skip-link {
    display: none;
  }

  .section {
    break-inside: avoid-page;
  }
}