:root {
  --bg: #faf8fb;
  --fg: #1e1622;
  --muted: #6b5f74;
  --rule: #e5dfe8;
  --link: #6b3fa0;
  --panel: #f1ecf4;
  --measure: 34rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17131a;
    --fg: #e9e3ee;
    --muted: #9a8ea3;
    --rule: #2b2430;
    --link: #b691e0;
    --panel: #1e1922;
  }
}

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

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

body {
  margin: 0;
  padding: 0 1.5rem;
  background: var(--bg);
  color: var(--fg);
  font-family: Charter, "Bitstream Charter", "Iowan Old Style", Georgia, Cambria, "Times New Roman", Times, serif;
  font-size: 1.125rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

main, .site-header, .site-footer {
  max-width: var(--measure);
  margin-inline: auto;
}

/* ---------- header ---------- */

.site-header {
  padding: 3.5rem 0 0;
}

.site-title {
  display: inline-block;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg);
  text-decoration: none;
}

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

.tagline {
  margin: 0.4rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
  font-style: italic;
}

.site-nav {
  margin: 1.4rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav a {
  margin-right: 1.4rem;
  color: var(--muted);
  text-decoration: none;
}

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

/* ---------- content ---------- */

main { padding: 2.5rem 0 1rem; }

h1, h2, h3 { font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; }

h1 {
  font-size: 2rem;
  line-height: 1.2;
  margin: 0 0 0.75rem;
  letter-spacing: -0.015em;
}

h2 { font-size: 1.35rem; line-height: 1.3; margin: 2.25rem 0 0.6rem; }
h3 { font-size: 1.12rem; margin: 1.75rem 0 0.5rem; }

p { margin: 0 0 1.15rem; }

a { color: var(--link); text-decoration-thickness: 1px; text-underline-offset: 2px; }

blockquote {
  margin: 1.5rem 0;
  padding-left: 1.1rem;
  border-left: 3px solid var(--rule);
  color: var(--muted);
  font-style: italic;
}

hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }

img { max-width: 100%; height: auto; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--panel);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

pre {
  background: var(--panel);
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
}

pre code { background: none; padding: 0; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

th, td {
  text-align: left;
  padding: 0.55rem 0.6rem;
  border-bottom: 1px solid var(--rule);
}

th { font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; font-size: 0.85rem; letter-spacing: 0.04em; text-transform: uppercase; color: var(--muted); }

/* ---------- essay ---------- */

.dateline {
  margin: 0 0 2rem;
  color: var(--muted);
  font-size: 0.9rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.essay-nav {
  margin: 3.5rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-size: 0.95rem;
}

/* ---------- index ---------- */

.intro { margin-bottom: 2.5rem; }

.list-heading {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.75rem;
  font-weight: 600;
}

.essay-list ul { list-style: none; margin: 0; padding: 0; }

.essay-list li {
  padding: 1.1rem 0;
  border-top: 1px solid var(--rule);
}

.essay-list a {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.2rem;
  text-decoration: none;
  color: var(--fg);
}

.essay-list a:hover { color: var(--link); text-decoration: underline; }

.essay-list .meta {
  display: block;
  margin-top: 0.3rem;
  color: var(--muted);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
}

.essay-list .desc {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.5;
}

/* ---------- artwork ---------- */

.hero, .artwork { margin: 0 0 2.25rem; }

.artwork { margin-top: 2rem; }

.hero img, .artwork img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--rule);
  border-radius: 8px;
}

/* ---------- related ---------- */

.related {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}

.related li:first-child { border-top: 0; padding-top: 0; }

.related a { font-size: 1.05rem; }

/* ---------- glossary ---------- */

.glossary-index {
  margin: 0 0 2.5rem;
  padding: 1rem 1.15rem;
  background: var(--panel);
  border-radius: 8px;
  font-size: 0.92rem;
  line-height: 2;
}

.glossary-index a { margin-right: 0.9rem; text-decoration: none; }
.glossary-index a:hover { text-decoration: underline; }

.glossary h2 {
  margin: 2rem 0 0.35rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-size: 1.15rem;
}

.glossary h2:first-of-type { border-top: 0; padding-top: 0; margin-top: 0; }

/* ---------- tool ---------- */

.tool-panel {
  margin: 2rem 0;
  padding: 1.35rem 1.4rem;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 10px;
}

.tool-panel .row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem;
  margin-bottom: 0.85rem;
}

.tool-panel label {
  flex: 0 0 8.5rem;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.tool-panel select,
.tool-panel input {
  flex: 1 1 8rem;
  padding: 0.4rem 0.5rem;
  font: inherit;
  font-size: 0.95rem;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 5px;
}

.tool-out {
  margin-top: 1.35rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--rule);
}

.tool-score {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 2.6rem;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.tool-label {
  margin-left: 0.6rem;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.tool-vector {
  margin: 0.9rem 0 0;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.85rem;
  color: var(--muted);
  word-break: break-all;
}

.tool-note {
  margin: 1.25rem 0 0;
  font-size: 0.86rem;
  color: var(--muted);
}

/* ---------- use cases ---------- */

.use-cases { margin: 2rem 0 0; }

.use-case {
  padding: 1.35rem 0;
  border-top: 1px solid var(--rule);
}

.use-case h2 { margin: 0 0 0.4rem; font-size: 1.15rem; }
.use-case p { margin: 0; color: var(--muted); font-size: 0.98rem; }

/* ---------- footer ---------- */

.site-footer {
  margin-top: 4rem;
  padding: 1.25rem 0 3rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer p { margin: 0; }

/* Availability notice — visible, sits between the content and the footer. */
.for-sale {
  max-width: var(--measure);
  margin: 3.5rem auto 0;
  padding: 1.05rem 1.25rem;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 8px;
}

.for-sale p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--fg);
}

.for-sale strong { font-weight: 600; }

.for-sale a {
  color: var(--link);
  text-underline-offset: 2px;
  word-break: break-word;
}