:root {
  --white: #ffffff;
  --black: #0a0a0a;
  --line: #d9d9d9;
  --blue: #006cff;
  --blue-dark: #0054c7;
  --green-shadow: rgba(34, 94, 54, 0.30);
  --red-shadow: rgba(170, 20, 45, 0.48);
  --red-shadow-strong: rgba(170, 20, 45, 0.72);
  --max: 760px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--white);
  color: var(--black);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 18px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

/* Ordinary hyperlinks are electric blue. */
a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--blue-dark);
}

a:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 4px;
  border-radius: 2px;
}

.site-header {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 22px;
  border-bottom: 1px solid var(--line);
}

/* Website navigation stays black and carries the crimson-red shadow. */
.brand,
.back-link,
.note-footer a {
  color: var(--black);
  text-decoration: none;
  text-shadow: 1px 1px 0 var(--red-shadow);
  transition: text-shadow 140ms ease;
}

.brand:hover,
.back-link:hover,
.note-footer a:hover {
  color: var(--black);
  text-shadow: 2px 2px 0 var(--red-shadow-strong);
}

.brand {
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

main {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 72px 0 96px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--black);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  color: var(--black);
  line-height: 1.15;
  letter-spacing: -0.025em;
}

h1 {
  margin: 0 0 20px;
  font-size: clamp(2.6rem, 8vw, 5.2rem);
  font-weight: 780;
}

h2 {
  margin: 64px 0 18px;
  font-size: clamp(1.65rem, 4vw, 2.3rem);
}

h3 {
  margin: 42px 0 12px;
  font-size: 1.25rem;
}

.lede {
  max-width: 630px;
  margin: 0;
  color: var(--black);
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
}

.note-list {
  margin-top: 72px;
}

.note-group {
  margin-top: 52px;
}

.note-group h2 {
  margin: 0 0 8px;
  color: var(--black);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.note-card {
  display: block;
  padding: 26px 0 28px;
  border-top: 1px solid var(--line);
  text-decoration: none;
}

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

.note-card h3 {
  margin: 0 0 6px;
  color: var(--blue);
  font-size: clamp(1.45rem, 4vw, 2rem);
}

.note-card p {
  margin: 0;
  color: var(--black);
}

.note-card .read {
  display: inline-block;
  margin-top: 12px;
  color: var(--blue);
  font-weight: 700;
}

.note-card:hover h3,
.note-card:hover .read {
  color: var(--blue-dark);
}

.back-link {
  display: inline-block;
  margin-bottom: 56px;
  font-size: 0.9rem;
  font-weight: 700;
}

.note-header {
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
}

.note-header h1 {
  font-size: clamp(2.4rem, 7vw, 4.8rem);
}

.meta {
  margin: 26px 0 0;
  color: var(--black);
  font-size: 0.88rem;
}

.meta span + span::before {
  content: " · ";
}

.handle {
  margin: 44px 0;
  padding: 24px 0 24px 24px;
  border-left: 4px solid var(--black);
  color: var(--black);
  font-size: 1.16rem;
  font-weight: 650;
}

.toc {
  margin: 48px 0 64px;
  padding: 26px 28px;
  background: var(--white);
  border: 1px solid var(--line);
}

.toc h2 {
  margin: 0 0 12px;
  font-size: 1rem;
}

.toc ol {
  margin: 0;
  padding-left: 1.25rem;
}

.toc li + li {
  margin-top: 6px;
}

article p {
  margin: 0 0 1.25em;
}

article ul,
article ol {
  padding-left: 1.25em;
}

article li + li {
  margin-top: 0.45em;
}

article blockquote {
  margin: 36px 0;
  padding-left: 22px;
  border-left: 3px solid var(--black);
  color: var(--black);
}

article code {
  padding: 0.12em 0.34em;
  background: var(--white);
  color: var(--black);
  border: 1px solid var(--line);
  border-radius: 3px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
}

/* Every table uses white cells, black text, and a forest-green shadow. */
table {
  width: 100%;
  margin: 32px 0;
  border-collapse: collapse;
  background: var(--white);
  color: var(--black);
  box-shadow: 5px 5px 0 var(--green-shadow);
  font-size: 0.92rem;
}

th,
td {
  padding: 12px 14px;
  background: var(--white);
  color: var(--black);
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  font-weight: 750;
}

.note-footer {
  margin-top: 80px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
}

@media (max-width: 620px) {
  body {
    font-size: 17px;
  }

  .site-header {
    width: min(var(--max), calc(100% - 28px));
  }

  main {
    width: min(var(--max), calc(100% - 28px));
    padding-top: 52px;
  }

  .toc {
    padding: 22px;
  }

  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}


/* Compatibility rules for the original Human Day & Night article markup. */
.article-introduction {
  margin: 48px 0;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--line);
}

.article-introduction p,
.longform-article p {
  margin: 0 0 1.25em;
}

.table-of-contents {
  display: block;
}

.table-of-contents summary {
  cursor: pointer;
  color: var(--black);
  font-weight: 800;
}

.table-of-contents .toc-list {
  margin-top: 18px;
  padding-left: 1.25rem;
}

.table-of-contents li + li {
  margin-top: 6px;
}

.longform-article h4 {
  margin: 32px 0 10px;
  color: var(--black);
  font-size: 1.05rem;
  line-height: 1.25;
}

.longform-article section[id],
.longform-article h2[id],
.longform-article h3[id],
.longform-article h4[id] {
  scroll-margin-top: 24px;
}

.longform-article table {
  display: table;
  width: 100%;
  margin: 32px 0;
  border-collapse: collapse;
  background: var(--white);
  box-shadow: 0 5px 14px var(--green-shadow);
}

.longform-article th,
.longform-article td {
  padding: 12px 14px;
  border: 1px solid var(--line);
  color: var(--black);
  text-align: left;
  vertical-align: top;
}

.longform-article th {
  font-weight: 800;
}

.publication-navigation {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 20px;
}

.site-footer {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 48px;
  border-top: 1px solid var(--line);
  color: var(--black);
  font-size: 0.82rem;
}

@media (max-width: 640px) {
  .toc {
    padding: 22px 20px;
  }

  .longform-article table {
    display: block;
    overflow-x: auto;
    white-space: normal;
  }

  .publication-navigation {
    flex-direction: column;
  }
}