/* Shared monochrome system — lifted from the Architecture HTML */
:root {
  --fg:     #0a0a0a;
  --fg-2:   #525252;
  --fg-3:   #737373;
  --fg-4:   #a3a3a3;
  --bg:     #ffffff;
  --bg-2:   #fafafa;
  --bg-3:   #f5f5f5;
  --line:   #e5e5e5;
  --line-2: #d4d4d4;
  --line-3: #171717;
  --accent: #29456B; /* used sparingly, only for narrative moments */
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', sans-serif;
  color: var(--fg);
  background: var(--bg);
  max-width: 1120px;
  margin: 0 auto;
  padding: 56px 40px 96px;
  font-size: 14px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
.mono, .eyebrow, .meta {
  font-family: ui-monospace, 'SF Mono', 'JetBrains Mono', 'Menlo', monospace;
}
.eyebrow {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-3);
  display: block;
  margin-bottom: 12px;
}
.serif {
  font-family: Georgia, 'Times New Roman', serif;
  font-weight: 300;
  letter-spacing: -0.02em;
}

/* Header */
header {
  border-bottom: 1px solid var(--line-3);
  padding-bottom: 20px;
  margin-bottom: 40px;
}
header h1 {
  font-size: 22px;
  font-weight: 600;
  margin: 6px 0 0;
  letter-spacing: -0.015em;
}
header .meta {
  font-size: 11px;
  color: var(--fg-3);
  margin-top: 10px;
  letter-spacing: 0.02em;
}
header nav {
  margin-top: 18px;
  font-family: ui-monospace, 'SF Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--fg-3);
}
header nav a {
  color: var(--fg-3);
  text-decoration: none;
  margin-right: 18px;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color 0.12s, border-color 0.12s;
}
header nav a:hover { color: var(--fg); border-color: var(--fg); }
header nav a.active { color: var(--fg); border-color: var(--fg); }

/* Section */
section.block { margin-bottom: 48px; }
.frame {
  border: 1px solid var(--line-3);
  background: var(--bg);
  padding: 24px 26px 26px;
}
.frame-compact {
  border: 1px solid var(--line-3);
  background: var(--bg);
  padding: 16px 18px;
}

/* Type utilities */
h2.section-title {
  font-family: ui-monospace, 'SF Mono', monospace;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg);
  margin: 0 0 14px;
}
h3.sub {
  font-size: 13px;
  font-weight: 600;
  margin: 0 0 8px;
  letter-spacing: -0.005em;
}
p { margin: 0 0 12px; }
.lede {
  font-size: 16px;
  line-height: 1.5;
  color: var(--fg);
  max-width: 62ch;
}
.muted { color: var(--fg-2); }
.faint { color: var(--fg-4); }

/* Tables */
table.kq {
  width: 100%;
  border-collapse: collapse;
  font-size: 12.5px;
}
table.kq th, table.kq td {
  text-align: left;
  padding: 9px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
table.kq th {
  font-family: ui-monospace, 'SF Mono', monospace;
  font-weight: 500;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-3);
  border-bottom: 1px solid var(--line-3);
}
table.kq td.k {
  font-family: ui-monospace, 'SF Mono', monospace;
  font-size: 11px;
  color: var(--fg);
  width: 180px;
}
table.kq tr.featured td {
  background: var(--bg-2);
  border-bottom: 1px solid var(--line-2);
}
table.kq td.num {
  font-family: ui-monospace, 'SF Mono', monospace;
  font-size: 12px;
  color: var(--fg);
  text-align: center;
  width: 52px;
}

/* Card grid */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.card {
  border: 1px solid var(--line-3);
  padding: 20px 22px 22px;
  background: var(--bg);
}
.card .eyebrow { margin-bottom: 10px; }
.card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 13px;
}
.card li {
  padding: 8px 0;
  border-top: 1px solid var(--line);
}
.card li:first-child { border-top: none; padding-top: 0; }
.card li strong { color: var(--fg); font-weight: 600; margin-right: 4px; }

/* Collapsible */
details { border-bottom: 1px solid var(--line); }
details:last-of-type { border-bottom: none; }
details summary {
  cursor: pointer;
  padding: 16px 4px;
  font-size: 13px;
  font-weight: 500;
  color: var(--fg);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  outline: none;
}
details summary::-webkit-details-marker { display: none; }
details summary .label-left {
  display: flex;
  align-items: center;
  gap: 14px;
}
details summary .num {
  font-family: ui-monospace, 'SF Mono', monospace;
  font-size: 10px;
  color: var(--fg-3);
  letter-spacing: 0.1em;
  min-width: 24px;
}
details summary .caret {
  font-family: ui-monospace, 'SF Mono', monospace;
  font-size: 14px;
  color: var(--fg-3);
}
details[open] summary .caret { color: var(--fg); }
details summary:hover { background: var(--bg-2); }
details .body {
  padding: 4px 4px 22px 42px;
  font-size: 12.5px;
  color: var(--fg-2);
  line-height: 1.65;
}
details .body p { margin: 0 0 10px; }

/* Code / email body */
.email-block {
  background: var(--bg-2);
  border-left: 1px solid var(--line-3);
  padding: 16px 18px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--fg);
  white-space: pre-wrap;
  font-family: Georgia, serif;
}
.email-block .subj {
  font-family: ui-monospace, 'SF Mono', monospace;
  font-size: 11px;
  color: var(--fg-2);
  letter-spacing: 0.04em;
  margin-bottom: 14px;
  display: block;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

/* Pill / tag */
.tag {
  display: inline-block;
  font-family: ui-monospace, 'SF Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 2px 7px;
  border: 1px solid var(--line-2);
  color: var(--fg-2);
  margin-right: 4px;
}
.tag.solid {
  background: var(--fg);
  color: #fff;
  border-color: var(--fg);
}

/* Footer */
footer {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font-family: ui-monospace, 'SF Mono', monospace;
  font-size: 10.5px;
  color: var(--fg-4);
  letter-spacing: 0.04em;
}

/* Links */
a.inline {
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid var(--line-2);
  padding-bottom: 1px;
}
a.inline:hover { border-color: var(--fg); }

@media (max-width: 720px) {
  body { padding: 32px 20px 64px; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}