:root {
  color-scheme: dark;
  --bg: #11130f;
  --surface: #191b16;
  --surface-strong: #20231c;
  --ink: #f2eee3;
  --muted: #aaa89b;
  --faint: #8f8c80;
  --line: #3b3d34;
  --signal: #e9b35b;
  --signal-ink: #1d180e;
  --link: #f0c878;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.45;
  overflow-x: hidden;
}

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

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 4px;
}

button,
code,
.eyebrow,
.panel-kicker,
.header-note,
.receipt-topline,
.receipt-label,
.note-label,
.steps span,
.footer-mark {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

code {
  color: var(--ink);
  font-size: 0.94em;
  overflow-wrap: anywhere;
}

.page-shell {
  width: min(calc(100% - 3rem), 1120px);
  margin: 0 auto;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 10;
  padding: 0.55rem 0.8rem;
  background: var(--signal);
  color: var(--signal-ink);
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.project-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
  min-height: 5.75rem;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.header-note,
.eyebrow,
.panel-kicker,
.receipt-topline,
.receipt-label,
.note-label {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  line-height: 1.3;
  text-transform: uppercase;
}

.header-note {
  margin: 0;
  color: var(--faint);
}

.section {
  padding: 7rem 0;
}

.challenge {
  padding-top: 5rem;
  padding-bottom: 6.75rem;
}

.challenge-grid,
.meaning-grid,
.run-grid,
.privacy-grid,
.method-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(18rem, 0.85fr);
  align-items: start;
  gap: clamp(3rem, 8vw, 7rem);
}

.challenge-copy {
  min-width: 0;
}

.eyebrow,
.panel-kicker {
  margin: 0 0 1.2rem;
  color: var(--signal);
}

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

h1,
h2 {
  color: var(--ink);
  font-weight: 650;
}

h1 {
  max-width: 18ch;
  margin-bottom: 1.6rem;
  font-size: clamp(2.8rem, 6.5vw, 4.8rem);
  letter-spacing: -0.06em;
  line-height: 1.03;
}

h2 {
  max-width: 22ch;
  margin-bottom: 0;
  font-size: clamp(1.55rem, 3vw, 2rem);
  letter-spacing: -0.035em;
  line-height: 1.15;
}

.lede,
.body-copy,
.share-copy > p:first-child {
  max-width: 64ch;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.5;
}

.lede {
  margin-bottom: 2.5rem;
}

.run-panel {
  max-width: 700px;
  margin-bottom: 1.25rem;
  padding: 1.35rem;
  border: 1px solid var(--line);
  background: var(--surface);
}

.panel-kicker {
  margin-bottom: 0.8rem;
  color: var(--muted);
}

.command-line {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--line);
  background: var(--bg);
}

.command-line code {
  min-width: 0;
  flex: 1 1 16rem;
  color: var(--ink);
  font-size: 0.94rem;
  line-height: 1.4;
}

.copy-button {
  flex: 0 0 auto;
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--signal);
  border-radius: 3px;
  background: var(--signal);
  color: var(--signal-ink);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.copy-button:hover {
  background: var(--ink);
  border-color: var(--ink);
}

.copy-status {
  min-height: 1.2rem;
  margin: 0.6rem 0 0;
  color: var(--signal);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.78rem;
}

.panel-note {
  margin: 0.7rem 0 0;
  color: var(--faint);
  font-size: 0.87rem;
}

.secondary-link {
  display: inline-block;
  color: var(--muted);
  font-size: 0.92rem;
}

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

.score-receipt {
  margin-top: 2.4rem;
  padding: 1.35rem;
  border: 1px solid var(--line);
  background: var(--surface);
}

.receipt-topline,
.receipt-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.receipt-topline {
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}

.receipt-state {
  color: var(--faint);
  font-size: 0.63rem;
}

.receipt-label {
  margin: 1.4rem 0 0.35rem;
  color: var(--signal);
  font-weight: 700;
}

.receipt-caption {
  max-width: 35ch;
  margin-bottom: 1.6rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.score-list {
  margin: 0;
}

.score-list div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
  border-top: 1px solid var(--line);
}

.score-list dt {
  color: var(--muted);
  font-size: 0.87rem;
}

.score-list dd {
  margin: 0;
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 1.12rem;
  font-weight: 700;
}

.receipt-footer {
  margin-top: 1.25rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.7rem;
}

.section-rule {
  border-top: 1px solid var(--line);
}

.section-heading {
  margin-bottom: 2.5rem;
}

.meaning-grid,
.run-grid,
.privacy-grid,
.method-grid {
  grid-template-columns: minmax(0, 0.9fr) minmax(18rem, 1.1fr);
}

.body-copy {
  margin-bottom: 0;
}

.definition-note {
  padding-left: 1.25rem;
  border-left: 2px solid var(--signal);
}

.note-label {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--signal);
}

.definition-note p {
  max-width: 55ch;
  margin: 0;
  color: var(--ink);
  font-size: 1.05rem;
  line-height: 1.45;
}

.steps,
.method-links {
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps li {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  gap: 0.9rem;
  padding: 0.8rem 0;
  border-top: 1px solid var(--line);
}

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

.steps span {
  color: var(--signal);
  font-size: 0.8rem;
}

.steps p {
  margin: 0;
  color: var(--muted);
}

.privacy-grid {
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 1fr);
}

.boundary-list p {
  margin: 0;
  padding: 0.85rem 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.boundary-list p:last-child {
  border-bottom: 1px solid var(--line);
}

.boundary-list p > span {
  margin-right: 0.45rem;
  color: var(--signal);
}

.boundary-list strong {
  color: var(--ink);
  font-weight: 600;
}

.method-links li {
  border-top: 1px solid var(--line);
}

.method-links li:last-child {
  border-bottom: 1px solid var(--line);
}

.method-links a {
  display: block;
  padding: 0.9rem 0;
}

.share-section {
  padding-bottom: 8rem;
}

.share-copy {
  max-width: 720px;
  margin-left: auto;
}

.share-copy > p:first-child {
  margin-bottom: 1.25rem;
  color: var(--ink);
  font-size: 1.35rem;
  line-height: 1.4;
}

.share-copy .source-line {
  max-width: 64ch;
  margin-bottom: 0;
  color: var(--muted);
}

.share-copy .share-invitation {
  max-width: 64ch;
  margin-top: 1.5rem;
  margin-bottom: 0;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.94rem;
}

.site-footer {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.6rem 0 2.5rem;
  border-top: 1px solid var(--line);
}

.footer-mark {
  margin: 0;
  color: var(--faint);
  font-size: 0.73rem;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  font-size: 0.82rem;
}

@media (max-width: 720px) {
  .page-shell {
    width: min(calc(100% - 2rem), 1120px);
  }

  .project-header {
    min-height: 5rem;
    align-items: center;
  }

  .header-note {
    max-width: 16ch;
    text-align: right;
  }

  .section,
  .challenge {
    padding: 4.5rem 0;
  }

  .challenge-grid,
  .meaning-grid,
  .run-grid,
  .privacy-grid,
  .method-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  h1 {
    max-width: 12ch;
    font-size: clamp(2.7rem, 14vw, 4rem);
  }

  .command-line {
    flex-direction: column;
    align-items: stretch;
  }

  .command-line code {
    width: 100%;
    flex: 0 1 auto;
  }

  .copy-button {
    width: 100%;
  }

  .score-receipt {
    margin-top: 0;
  }

  .share-copy {
    margin-left: 0;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}