:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --border: #e5e5e7;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #0a84ff;
  --accent-dim: #e7f1ff;
  --good: #34c759;
  --good-dim: #e8f9ec;
  --bad: #ff3b30;
  --bad-dim: #fde8e7;
  --warn: #ff9500;
  --warn-dim: #fff1dd;
  --code-bg: #1d1d23;
  --code-text: #e1e1e6;
  --mono: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;
}

html,
body {
  background: var(--bg);
  color: var(--text);
}

body {
  margin: 0;
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 40px 28px 80px;
}

header.page {
  border-bottom: 1px solid var(--border);
  padding-bottom: 28px;
  margin-bottom: 36px;
}

header.page .eyebrow,
.toc h2,
.card .date,
.diagram-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: var(--muted);
}

header.page .eyebrow {
  margin-bottom: 12px;
}

h1 {
  font-size: 36px;
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: -0.5px;
}

.sub {
  font-size: 15px;
  color: var(--muted);
}

.toc,
.card,
.diagram,
.lane {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.toc {
  padding: 18px 22px;
  margin-bottom: 40px;
}

.toc h2 {
  margin: 0 0 10px;
}

.toc ol {
  margin: 0;
  padding-left: 22px;
}

.toc li {
  margin-bottom: 4px;
}

.toc a {
  color: var(--text);
  text-decoration: none;
}

.toc a:hover,
.card:hover h2 {
  color: var(--accent);
}

h2.section {
  font-size: 24px;
  font-weight: 700;
  margin: 56px 0 16px;
  letter-spacing: -0.3px;
  padding-top: 8px;
}

h3.subhead {
  font-size: 17px;
  font-weight: 600;
  margin: 28px 0 10px;
}

p {
  margin: 0 0 14px;
}

ul,
ol {
  margin: 0 0 14px;
  padding-left: 22px;
}

li {
  margin-bottom: 4px;
}

.lead {
  font-size: 17px;
  line-height: 1.55;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}

.spec-list {
  display: grid;
  gap: 16px;
}

.card {
  display: block;
  padding: 20px 24px;
  margin: 0 0 20px;
  color: var(--text);
  text-decoration: none;
}

a.card:hover {
  border-color: #b8d7ff;
  box-shadow: 0 10px 28px rgba(10, 132, 255, 0.08);
}

.card .date {
  margin-bottom: 8px;
}

.card h2 {
  font-size: 20px;
  margin: 0 0 6px;
}

.card p {
  color: var(--muted);
}

.tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
  margin-right: 6px;
  vertical-align: middle;
}

.tag.add {
  background: var(--good-dim);
  color: var(--good);
}

.tag.trim {
  background: var(--accent-dim);
  color: var(--accent);
}

.tag.risk {
  background: var(--warn-dim);
  color: #b46a00;
}

.tag.del {
  background: var(--bad-dim);
  color: var(--bad);
}

table.summary {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

table.summary th,
table.summary td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

table.summary th {
  font-weight: 600;
  color: var(--muted);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

table.summary tr:last-child td {
  border-bottom: none;
}

code.inline,
table.summary code {
  font-family: var(--mono);
  font-size: 13px;
  background: #f0f0f3;
  padding: 1px 6px;
  border-radius: 4px;
}

pre.code {
  background: var(--code-bg);
  color: var(--code-text);
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.55;
  padding: 16px 20px;
  border-radius: 10px;
  overflow-x: auto;
  margin: 0 0 16px;
}

.callout {
  border-left: 3px solid var(--accent);
  background: var(--accent-dim);
  padding: 12px 16px;
  border-radius: 6px;
  margin: 0 0 16px;
  font-size: 14px;
}

.callout.warn {
  border-color: var(--warn);
  background: var(--warn-dim);
}

.callout.bad {
  border-color: var(--bad);
  background: var(--bad-dim);
}

.callout.good {
  border-color: var(--good);
  background: var(--good-dim);
}

.callout strong {
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.diagram {
  padding: 18px;
  margin-bottom: 20px;
}

.diagram-title {
  letter-spacing: 0.6px;
  margin-bottom: 12px;
}

.diagram svg {
  display: block;
  width: 100%;
  height: auto;
}

.lanes {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-bottom: 20px;
}

.lane {
  padding: 18px;
}

.lane h4 {
  margin: 0 0 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.ops {
  list-style: none;
  padding: 0;
  counter-reset: op 0;
}

.ops li {
  display: flex;
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.ops li:last-child {
  border-bottom: none;
}

.ops li::before {
  counter-increment: op;
  content: counter(op);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-dim);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.ops li .op-body h4 {
  margin: 4px 0 4px;
  font-size: 14px;
  font-weight: 600;
}

.ops li .op-body p {
  margin: 0;
  font-size: 13.5px;
  color: #4a4a4f;
}

footer.page {
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
}

@media (max-width: 720px) {
  .grid-2,
  .lanes {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 30px;
  }

  .wrap {
    padding: 28px 18px 64px;
  }
}