:root {
  --ink: #18170f;
  --ink-2: #3a382c;
  --muted: #6d6a5a;
  --line: #e6e2d4;
  --paper: #f7f3e8;
  --paper-2: #fbf8ee;
  --card: #ffffff;
  --accent: #6b3410; /* burgundy/oak — fits the wine domain */
  --accent-2: #2f4a2b;
  --tag: #ece5d0;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--paper); color: var(--ink); }
body {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 72px 56px 120px;
}
/* --- Cover header --- */
.cover {
  border-bottom: 1px solid var(--line);
  padding-bottom: 40px;
  margin-bottom: 40px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: end;
}
.eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 14px;
}
h1.title {
  font-family: 'Fraunces', serif;
  font-weight: 500;
  font-size: 64px;
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
  color: var(--ink);
}
h1.title em {
  font-style: italic;
  font-weight: 400;
  color: var(--accent);
}
.subtitle {
  font-family: 'Fraunces', serif;
  font-size: 20px;
  font-weight: 400;
  color: var(--ink-2);
  max-width: 640px;
  margin: 0;
}
.meta {
  text-align: right;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--muted);
  line-height: 1.7;
  letter-spacing: 0.04em;
}
.meta strong { color: var(--ink); font-weight: 600; }

/* --- Naming note --- */
.note {
  font-size: 13px;
  color: var(--muted);
  border-left: 2px solid var(--accent);
  padding: 2px 0 2px 16px;
  margin: 0 0 40px;
  max-width: 760px;
}
.note code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--ink-2);
}

/* --- TOC --- */
.toc {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 22px 28px;
  margin-bottom: 64px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.toc-item .num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.1em;
}
.toc-item .name {
  font-family: 'Fraunces', serif;
  font-size: 17px;
  font-weight: 500;
  margin-top: 4px;
  color: var(--ink);
}
.toc-item .desc {
  font-size: 12.5px;
  color: var(--muted);
  margin-top: 4px;
}

/* --- Project section --- */
section.project {
  margin-bottom: 96px;
}
.project-header {
  display: grid;
  grid-template-columns: 80px 1fr auto;
  gap: 24px;
  align-items: baseline;
  padding-bottom: 18px;
  border-bottom: 2px solid var(--ink);
  margin-bottom: 36px;
}
.project-number {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-size: 56px;
  line-height: 0.9;
  color: var(--accent);
  font-weight: 400;
}
.project-title {
  font-family: 'Fraunces', serif;
  font-size: 36px;
  font-weight: 500;
  margin: 0;
  letter-spacing: -0.01em;
}
.project-title small {
  display: block;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--muted);
  font-weight: 400;
  margin-top: 6px;
  letter-spacing: 0.05em;
}
.stack {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  justify-content: flex-end;
  max-width: 380px;
}
.tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  padding: 3px 8px;
  background: var(--tag);
  color: var(--ink-2);
  border-radius: 2px;
  letter-spacing: 0.02em;
}

/* --- Diagram block --- */
.diagram {
  margin: 0 0 56px;
}
.diagram-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 14px;
  gap: 16px;
}
.diagram-head h3 {
  font-family: 'Fraunces', serif;
  font-size: 22px;
  font-weight: 500;
  margin: 0;
  letter-spacing: -0.005em;
}
.diagram-head h3 .kind {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--accent);
  background: transparent;
  margin-right: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-weight: 500;
}
.diagram-caption {
  font-size: 13px;
  color: var(--muted);
  max-width: 520px;
  text-align: right;
}
.diagram-frame {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 28px;
  overflow-x: auto;
  text-align: center;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.diagram-frame img,
.diagram-frame svg {
  max-width: 100%;
  height: auto;
}
.diagram-frame .loading {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--muted);
}
details.source {
  margin-top: 12px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper-2);
}
details.source summary {
  cursor: pointer;
  padding: 10px 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--muted);
  list-style: none;
  user-select: none;
}
details.source summary::-webkit-details-marker { display: none; }
details.source summary::before {
  content: '▸ ';
  display: inline-block;
  margin-right: 4px;
  transition: transform 0.15s;
}
details.source[open] summary::before { content: '▾ '; }
details.source pre {
  margin: 0;
  padding: 16px 20px;
  border-top: 1px solid var(--line);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  line-height: 1.55;
  overflow-x: auto;
  color: var(--ink-2);
  background: #fdfaf0;
}

/* --- Summary block --- */
.summary {
  background: #2a2520;
  color: #f3ede0;
  border-radius: 4px;
  padding: 32px 36px;
  margin-top: 32px;
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 28px;
  align-items: start;
}
.summary .label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #c8a07a;
  border-top: 1px solid #c8a07a;
  padding-top: 8px;
}
.summary p {
  margin: 0;
  font-family: 'Fraunces', serif;
  font-size: 17.5px;
  line-height: 1.5;
  font-weight: 400;
  color: #f3ede0;
}
.summary p + p { margin-top: 12px; }
.summary code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 14.5px;
  color: #e8cbae;
}

/* --- Footer --- */
footer.colophon {
  margin-top: 80px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  gap: 24px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.05em;
}

code.inline {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
}

/* --- Site navigation (every page) --- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(247, 243, 232, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.masthead-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 56px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
}
.masthead .brand {
  font-family: 'Fraunces', serif;
  font-size: 18px;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.masthead .brand span {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin-left: 10px;
  font-weight: 400;
}
.masthead nav {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.masthead nav a {
  color: var(--muted);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}
.masthead nav a:hover { color: var(--ink); }
.masthead nav a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* --- Previous / next pager --- */
.pager {
  margin-top: 72px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.pager a {
  text-decoration: none;
  color: var(--ink);
  display: block;
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--paper-2);
}
.pager a:hover { border-color: var(--accent); }
.pager a.next { grid-column: 2; text-align: right; }
.pager .dir {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
.pager .where {
  font-family: 'Fraunces', serif;
  font-size: 19px;
  font-weight: 500;
  margin-top: 4px;
}
.pager .what {
  font-size: 12.5px;
  color: var(--muted);
  margin-top: 2px;
}

/* Contents cards become links once there is somewhere to go. */
a.toc-item {
  text-decoration: none;
  color: inherit;
  display: block;
  border-left: 2px solid transparent;
  padding-left: 12px;
  margin-left: -14px;
}
a.toc-item:hover { border-left-color: var(--accent); }
a.toc-item:hover .name { color: var(--accent); }

/* --- Not found --- */
.notfound {
  max-width: 620px;
  margin: 0 auto;
  padding: 140px 22px 160px;
  text-align: center;
}
.notfound h1 {
  font-family: 'Fraunces', serif;
  font-size: 48px;
  font-weight: 500;
  margin: 0 0 12px;
}
.notfound p { color: var(--muted); margin: 0 0 28px; }
.notfound a { color: var(--accent); }

@media (max-width: 980px) {
  .toc { grid-template-columns: repeat(2, 1fr); }
  .masthead-inner { padding: 14px 22px; }
}
@media (max-width: 760px) {
  .page { padding: 40px 22px 80px; }
  h1.title { font-size: 42px; }
  .cover { grid-template-columns: 1fr; }
  .meta { text-align: left; }
  .toc { grid-template-columns: 1fr; }
  .project-header { grid-template-columns: 1fr; }
  .stack { justify-content: flex-start; }
  .summary { grid-template-columns: 1fr; }
  .diagram-head { flex-direction: column; align-items: flex-start; }
  .diagram-caption { text-align: left; }
  footer.colophon { flex-direction: column; gap: 8px; }
  .masthead-inner { flex-direction: column; align-items: flex-start; gap: 10px; }
  .masthead nav { gap: 16px; }
  .pager { grid-template-columns: 1fr; }
  .pager a.next { grid-column: 1; text-align: left; }
}