:root {
  --ink:      #11141c;
  --ink-soft: #2b313f;
  --slate:    #656d81;
  --rule:     #dde1e9;
  --paper:    #f7f8fa;
  --card:     #ffffff;
  --blue:     #2f6fd0;
  --blue-dim: #eaf1fc;
  --display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --body: "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink:      #eef0f5;
    --ink-soft: #c3c9d6;
    --slate:    #8b93a6;
    --rule:     #2a303d;
    --paper:    #0d1017;
    --card:     #141821;
    --blue:     #7aaefb;
    --blue-dim: #16243a;
  }
}
:root[data-theme="dark"] {
  --ink:      #eef0f5;
  --ink-soft: #c3c9d6;
  --slate:    #8b93a6;
  --rule:     #2a303d;
  --paper:    #0d1017;
  --card:     #141821;
  --blue:     #7aaefb;
  --blue-dim: #16243a;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: 46rem;
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1.25rem, 5vw, 2rem) 5rem;
}

/* ---- site chrome ---- */
.topbar {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding-bottom: 1.5rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--rule);
  flex-wrap: wrap;
}
.mark { display: flex; align-items: center; gap: .6rem; text-decoration: none; color: var(--ink); }
.mark svg { display: block; border-radius: 22%; }
.mark b {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -.01em;
}
.topbar nav { margin-left: auto; display: flex; gap: 1.25rem; }
.topbar nav a {
  font-family: var(--display);
  font-size: .82rem;
  font-weight: 500;
  color: var(--slate);
  text-decoration: none;
}
.topbar nav a:hover, .topbar nav a[aria-current="page"] { color: var(--blue); }

/* ---- headings ---- */
.eyebrow {
  font-family: var(--display);
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--blue);
  margin: 0 0 .9rem;
}
h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.9rem, 5.5vw, 2.8rem);
  line-height: 1.05;
  letter-spacing: -.022em;
  text-wrap: balance;
  margin: 0 0 1rem;
}
.meta {
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--slate);
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.5rem;
  margin: 0;
}
.lede { font-size: 1.1rem; color: var(--ink-soft); margin: 0 0 2.5rem; }
.lede strong { color: var(--ink); font-weight: 600; }

.doc-head { border-bottom: 2px solid var(--ink); padding-bottom: 1.6rem; margin-bottom: 2.5rem; }

section { margin-bottom: 2.5rem; }
h2 {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.14rem;
  letter-spacing: -.005em;
  margin: 0 0 .8rem;
  display: flex;
  gap: .75rem;
  align-items: baseline;
}
h2 .num { font-family: var(--mono); font-size: .8rem; font-weight: 500; color: var(--blue); flex: none; }
p { margin: 0 0 1rem; }
p:last-child { margin-bottom: 0; }
ul { margin: 0 0 1rem; padding-left: 1.1rem; }
li { margin-bottom: .5rem; }
li::marker { color: var(--slate); }
a { color: var(--blue); text-underline-offset: 3px; }
a:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; border-radius: 2px; }

.callout {
  background: var(--card);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--blue);
  padding: 1.1rem 1.3rem;
  margin: 0 0 1rem;
  font-size: .97rem;
}
.callout p:last-child { margin-bottom: 0; }

.tablewrap { overflow-x: auto; margin: 0 0 1rem; border: 1px solid var(--rule); background: var(--card); }
table { border-collapse: collapse; width: 100%; min-width: 33rem; font-size: .9rem; }
th, td { text-align: left; padding: .7rem .9rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
th {
  font-family: var(--display);
  font-weight: 600;
  font-size: .72rem;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--slate);
  white-space: nowrap;
}
tr:last-child td { border-bottom: none; }
td:first-child { font-family: var(--mono); font-size: .82rem; white-space: nowrap; color: var(--ink-soft); }

footer {
  margin-top: 3.5rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--slate);
  display: flex;
  flex-wrap: wrap;
  gap: .5rem 1.5rem;
}
footer a { color: var(--slate); }