:root {
  --ground:      #eff2f3;
  --surface:     #fbfcfc;
  --surface-2:   #e6ebec;
  --ink:         #14222a;
  --ink-2:       #46585f;
  --ink-3:       #74868d;
  --rule:        #d2dadc;
  --rule-strong: #b3bfc2;
  --accent:      #0d6f66;
  --accent-soft: #dceceA;
  --oxide:       #9d5326;
  --oxide-soft:  #f5e7dd;

  --serif: "Newsreader", ui-serif, Georgia, "Times New Roman", serif;
  --sans:  "Libre Franklin", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono:  "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --measure: 68ch;
  --rail: 148px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground:      #0d1518;
    --surface:     #141e22;
    --surface-2:   #1c282d;
    --ink:         #e2e9ea;
    --ink-2:       #a3b2b6;
    --ink-3:       #74868d;
    --rule:        #26343a;
    --rule-strong: #38494f;
    --accent:      #4fbdae;
    --accent-soft: #102b29;
    --oxide:       #d59263;
    --oxide-soft:  #2a1d13;
  }
}

:root[data-theme="dark"] {
  --ground:      #0d1518;
  --surface:     #141e22;
  --surface-2:   #1c282d;
  --ink:         #e2e9ea;
  --ink-2:       #a3b2b6;
  --ink-3:       #74868d;
  --rule:        #26343a;
  --rule-strong: #38494f;
  --accent:      #4fbdae;
  --accent-soft: #102b29;
  --oxide:       #d59263;
  --oxide-soft:  #2a1d13;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: calc(var(--rail) + var(--measure) + 96px);
  margin: 0 auto;
  padding: 0 28px 96px;
}

/* ------------------------------------------------------------- masthead */
.masthead {
  border-bottom: 2px solid var(--ink);
  padding: 64px 0 22px;
  margin-bottom: 48px;
}
.kicker {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 18px;
}
h1 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2.35rem, 5.6vw, 3.5rem);
  line-height: 1.03;
  letter-spacing: -0.021em;
  text-wrap: balance;
  margin: 0 0 20px;
}
.standfirst {
  font-family: var(--serif);
  font-size: clamp(1.06rem, 2.1vw, 1.28rem);
  line-height: 1.5;
  color: var(--ink-2);
  max-width: 58ch;
  margin: 0 0 26px;
}
.masthead-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--ink-3);
}
.masthead-meta span { white-space: nowrap; }
.masthead-meta b { color: var(--ink-2); font-weight: 500; }

/* ---------------------------------------------------------------- rails */
section { margin-bottom: 62px; }

.rail {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: 34px;
  align-items: start;
}
.rail-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-top: 0.7em;
  border-top: 1px solid var(--rule-strong);
  position: sticky;
  top: 22px;
}
.rail-body { min-width: 0; max-width: var(--measure); }

h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(1.5rem, 3vw, 1.95rem);
  line-height: 1.16;
  letter-spacing: -0.014em;
  text-wrap: balance;
  margin: 0 0 16px;
}
h3 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -0.005em;
  margin: 34px 0 8px;
}
p { margin: 0 0 17px; }
p:last-child { margin-bottom: 0; }
strong { font-weight: 600; }
em { font-style: italic; }

.lede { font-size: 1.06rem; color: var(--ink-2); }

code, .m {
  font-family: var(--mono);
  font-size: 0.87em;
  background: var(--surface-2);
  padding: 0.1em 0.36em;
  border-radius: 3px;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:focus-visible, .enabler:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ------------------------------------------------------------ the rules */
.rules { display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.rule-item { background: var(--surface); padding: 20px 22px; }
.rule-item .n {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 7px;
}
.rule-item p { font-size: 0.95rem; margin: 6px 0 0; color: var(--ink-2); }
.rule-item .claim {
  font-family: var(--serif);
  font-size: 1.16rem;
  line-height: 1.34;
  color: var(--ink);
}

/* ----------------------------------------------------------- the stack */
.stack { display: grid; gap: 7px; margin: 4px 0 20px; }
.layer {
  display: grid;
  grid-template-columns: 116px minmax(0, 1fr);
  gap: 18px;
  align-items: baseline;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  padding: 13px 17px;
}
.layer .who {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.layer .what { font-size: 0.94rem; }
.layer .what b { font-weight: 600; }
.layer .what span { color: var(--ink-2); }

/* -------------------------------------------------------------- a trace */
.trace {
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: 22px 24px;
  font-family: var(--mono);
  font-size: 12.6px;
  line-height: 1.85;
  overflow-x: auto;
}
.trace .q { color: var(--ink); font-weight: 500; display: block; margin-bottom: 12px; }
.trace .step { color: var(--ink-2); white-space: nowrap; }
.trace .tag { color: var(--accent); }
.trace .warn { color: var(--oxide); }
.trace hr { border: 0; border-top: 1px dashed var(--rule-strong); margin: 12px 0; }

/* ------------------------------------------------------------ enablers */
.family { margin-top: 30px; }
.family-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-bottom: 1px solid var(--rule-strong);
  padding-bottom: 7px;
  margin-bottom: 3px;
}
.family-head h3 { margin: 0; font-size: 1.02rem; }
.family-head .owner {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-left: auto;
  white-space: nowrap;
}
.enabler { border-bottom: 1px solid var(--rule); padding: 16px 0; }
.enabler:last-child { border-bottom: 0; }
.enabler h4 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.965rem;
  margin: 0 0 5px;
}
.enabler p { font-size: 0.93rem; color: var(--ink-2); margin: 0; }
.enabler .fails {
  display: block;
  margin-top: 7px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--oxide);
}

/* --------------------------------------------------------------- pullout */
.pullout {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding: 22px 24px;
  margin: 4px 0 20px;
}
.pullout p {
  font-family: var(--serif);
  font-size: 1.2rem;
  line-height: 1.42;
  margin: 0;
}
.caution {
  background: var(--oxide-soft);
  border-left: 3px solid var(--oxide);
  padding: 18px 22px;
  margin: 20px 0 0;
}
.caution p { font-size: 0.94rem; margin: 0; color: var(--ink-2); }
.caution b { color: var(--oxide); font-weight: 600; }

/* --------------------------------------------------------------- tables */
.tablewrap { overflow-x: auto; margin: 6px 0 4px; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}
th, td { text-align: left; padding: 9px 14px 9px 0; border-bottom: 1px solid var(--rule); }
th {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-weight: 400;
  border-bottom: 1px solid var(--rule-strong);
}
td.num { font-family: var(--mono); font-size: 0.85rem; white-space: nowrap; }

ul.plain { margin: 0; padding-left: 1.15em; }
ul.plain li { margin-bottom: 8px; }
ul.plain li::marker { color: var(--accent); }

footer {
  border-top: 1px solid var(--rule-strong);
  margin-top: 20px;
  padding-top: 22px;
  font-size: 0.88rem;
  color: var(--ink-3);
  max-width: var(--measure);
}
footer p { margin-bottom: 10px; }

@media (max-width: 720px) {
  .rail { grid-template-columns: 1fr; gap: 12px; }
  .rail-label { position: static; border-top: 0; padding-top: 0; }
  .layer { grid-template-columns: 1fr; gap: 4px; }
  .masthead { padding-top: 40px; }
  body { font-size: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* Promoted from inline style attributes: the site's CSP forbids them. */
.after-trace { margin-top: 17px; }
.after-table { margin-top: 18px; }

/* --------------------------------------------------------- site chrome */
.sitebar {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  border-bottom: 1px solid var(--rule);
  padding: 12px 0;
  font-family: var(--mono); font-size: 11.5px;
  letter-spacing: 0.06em; text-transform: uppercase;
}
.sitebar a { color: var(--ink-2); text-decoration: none; }
.sitebar a:hover { color: var(--accent); text-decoration: underline; }
.sitebar .here { color: var(--ink-3); }
.sitebar .spacer { flex: 1; }
.sitebar .cta {
  color: var(--accent); border: 1px solid var(--accent);
  border-radius: 999px; padding: 4px 12px; text-decoration: none;
}
.sitebar .cta:hover { background: var(--accent-soft); text-decoration: none; }