:root {
  color-scheme: light;
  --paper: #f4f0e8;
  --ink: #172326;
  --muted: #5c696b;
  --line: #c9c3b7;
  --teal: #006c65;
  --signal: #a84320;
  --panel: #fffdf8;
  --max: 1120px;
  font-family: "Yu Gothic UI", "Hiragino Kaku Gothic ProN", system-ui, sans-serif;
  background: var(--paper);
  color: var(--ink);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-width: 280px;
  background:
    linear-gradient(90deg, rgba(23, 35, 38, 0.035) 1px, transparent 1px) 0 0 / 32px 32px,
    var(--paper);
  color: var(--ink);
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 10;
  padding: 10px 14px;
  background: var(--ink);
  color: white;
  transform: translateY(-150%);
}

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

.site-shell {
  width: min(calc(100% - 40px), var(--max));
  margin: 0 auto;
}

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 24px 0 18px;
  border-bottom: 1px solid var(--ink);
}

.brand-link {
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.masthead nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 20px;
}

.masthead nav a {
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
  text-decoration: none;
}

.masthead nav a:hover,
.masthead nav a:focus-visible,
.masthead nav a[aria-current="page"] {
  border-bottom-color: var(--signal);
  color: var(--ink);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(240px, 0.55fr);
  gap: 48px;
  align-items: end;
  padding: 88px 0 72px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  grid-column: 1 / -1;
  margin: 0 0 -18px;
  color: var(--teal);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

h1,
h2,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(3rem, 8vw, 6.6rem);
  font-weight: 600;
  letter-spacing: -0.055em;
  line-height: 0.98;
}

.lede {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.9;
}

.running {
  margin: 56px 0;
  padding: 32px;
  border: 1px solid var(--ink);
  background: var(--panel);
  box-shadow: 8px 8px 0 var(--teal);
}

.section-heading {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 24px;
  align-items: start;
}

.section-number {
  margin: 5px 0 0;
  color: var(--signal);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.14em;
}

.running h2 {
  margin: 0;
  max-width: 780px;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 600;
  line-height: 1.25;
}

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 36px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.evidence-grid div {
  min-height: 112px;
  padding: 18px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.evidence-grid span {
  display: block;
  color: var(--muted);
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.evidence-grid strong {
  display: block;
  margin-top: 18px;
  font-family: ui-monospace, "Cascadia Code", monospace;
  font-size: 1.1rem;
}

.note {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

.status-chip {
  display: inline-block;
  margin: 0 0 14px;
  padding: 6px 9px;
  border: 1px solid var(--teal);
  color: var(--teal);
  font-family: ui-monospace, "Cascadia Code", monospace;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.05em;
}

.text-link {
  display: inline-block;
  margin-top: 22px;
  color: var(--teal);
  font-weight: 800;
  text-underline-offset: 4px;
}

.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 0 0 72px;
  background: var(--line);
  border: 1px solid var(--line);
}

.principles article {
  min-height: 220px;
  padding: 28px;
  background: var(--paper);
}

.principles article > span {
  color: var(--signal);
  font-family: ui-monospace, "Cascadia Code", monospace;
  font-weight: 800;
}

.principles h2 {
  margin: 42px 0 12px;
  font-size: 1.15rem;
}

.principles p {
  margin: 0;
  color: var(--muted);
  line-height: 1.75;
}

.page-main,
.article-main {
  padding: 72px 0 96px;
}

.page-header {
  max-width: 860px;
  margin-bottom: 56px;
}

.page-header .eyebrow,
.article-header .eyebrow {
  margin: 0 0 18px;
}

.page-header h1,
.article-header h1 {
  font-size: clamp(2.8rem, 7vw, 5.5rem);
}

.page-header > p:last-child,
.article-deck {
  max-width: 720px;
  margin: 28px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.9;
}

.experiment-card {
  padding: 32px;
  border: 1px solid var(--ink);
  background: var(--panel);
}

.experiment-card h2 {
  max-width: 820px;
  margin: 24px 0 16px;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(1.7rem, 4vw, 2.7rem);
  font-weight: 600;
  line-height: 1.35;
}

.experiment-card h2 a {
  text-decoration-thickness: 1px;
  text-underline-offset: 6px;
}

.experiment-card > p {
  max-width: 760px;
  color: var(--muted);
  line-height: 1.8;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--teal);
  font-family: ui-monospace, "Cascadia Code", monospace;
  font-size: 0.72rem;
  font-weight: 800;
}

dl {
  margin: 0;
}

.experiment-card dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 28px;
  background: var(--line);
  border: 1px solid var(--line);
}

.experiment-card dl > div,
.article-meta > div {
  padding: 14px;
  background: var(--panel);
}

dt {
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

dd {
  margin: 8px 0 0;
}

code {
  font-family: ui-monospace, "Cascadia Code", monospace;
  font-size: 0.9em;
}

.article-main article {
  width: min(100%, 900px);
  margin: 0 auto;
}

.article-header {
  padding-bottom: 44px;
  border-bottom: 1px solid var(--ink);
}

.article-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 36px;
  background: var(--line);
  border: 1px solid var(--line);
}

.disclosure,
.correction-callout {
  margin: 36px 0;
  padding: 20px 22px;
  border-left: 5px solid var(--teal);
  background: var(--panel);
}

.disclosure p,
.correction-callout p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.75;
}

.article-main section {
  padding: 38px 0;
  border-bottom: 1px solid var(--line);
}

.article-main section > h2,
.split-section h2 {
  margin: 0 0 18px;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(1.55rem, 3vw, 2.1rem);
  font-weight: 600;
}

.article-main section p,
.article-main section li {
  line-height: 1.9;
}

.article-main section > p,
.article-main section > ul,
.article-main section > ol {
  max-width: 760px;
}

.article-main blockquote {
  max-width: 760px;
  margin: 24px 0;
  padding: 18px 20px;
  border-left: 5px solid var(--signal);
  background: var(--panel);
}

.article-main blockquote p {
  margin: 0;
  line-height: 1.9;
}

.article-main section a {
  color: var(--teal);
  text-underline-offset: 3px;
}

.article-main li + li {
  margin-top: 8px;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
}

th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

thead th {
  background: var(--ink);
  color: white;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}

tbody th {
  width: 34%;
}

.split-section {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px;
}

.source-list {
  padding-left: 1.4rem;
}

.source-list a {
  color: var(--teal);
  text-underline-offset: 3px;
}

.source-meta {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.78rem;
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.about-grid article {
  min-height: 220px;
  padding: 28px;
  background: var(--panel);
}

.about-grid h2,
.empty-state h2 {
  margin: 0 0 16px;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 1.6rem;
  font-weight: 600;
}

.about-grid p,
.empty-state p {
  color: var(--muted);
  line-height: 1.8;
}

.empty-state {
  padding: 36px;
  border: 1px solid var(--line);
  background: var(--panel);
}

footer {
  padding: 24px 0 40px;
  border-top: 1px solid var(--ink);
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.7;
}

@media (max-width: 760px) {
  .site-shell {
    width: min(calc(100% - 28px), var(--max));
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 58px 0 48px;
  }

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

  .masthead nav {
    justify-content: flex-start;
  }

  .eyebrow {
    margin-bottom: -8px;
  }

  h1 {
    font-size: clamp(2.7rem, 14vw, 4.5rem);
  }

  .running {
    padding: 22px;
    box-shadow: 5px 5px 0 var(--teal);
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .evidence-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .split-section,
  .about-grid {
    grid-template-columns: 1fr;
  }

  .principles article {
    min-height: 0;
  }

  .principles h2 {
    margin-top: 24px;
  }
}

@media (max-width: 420px) {
  .evidence-grid {
    grid-template-columns: 1fr;
  }

  .evidence-grid div {
    min-height: 88px;
  }

  .article-meta,
  .experiment-card dl {
    grid-template-columns: 1fr;
  }
}