:root {
  --bg:      #f6f5f2;
  --surface: #ffffff;
  --panel:   #eae7e0;
  --ink:     #23201c;
  --dim:     #6b6459;
  --line:    #ddd8cd;
  --accent:  #41505c;
  --gap:     #a4562f;
  --measure: 42rem;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  --serif: Georgia, "Iowan Old Style", "Times New Roman", serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg:      #1a1815;
    --surface: #222018;
    --panel:   #2a2721;
    --ink:     #ece8e0;
    --dim:     #9e968a;
    --line:    #38342c;
    --accent:  #93aab9;
    --gap:     #e0895c;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
.wrap { width: min(72rem, 92vw); margin: 0 auto; }
a { color: var(--accent); }

/* Masthead ---------------------------------------------------------------- */
.masthead { border-bottom: 1px solid var(--line); background: var(--surface); }
.masthead .wrap { padding: 1.4rem 0 1.1rem; }
.brand { display: inline-flex; align-items: center; gap: .6rem; text-decoration: none; color: var(--ink); }
.brand-mark {
  width: 18px; height: 18px; border-radius: 2px;
  background:
    linear-gradient(var(--accent) 0 0) 0 0 / 100% 34% no-repeat,
    linear-gradient(var(--dim) 0 0)    0 50% / 62% 32% no-repeat,
    linear-gradient(var(--line) 0 0)   0 100% / 84% 34% no-repeat;
}
.brand-name { font-family: var(--serif); font-size: 1.35rem; letter-spacing: -.01em; }
.brand-name strong { font-weight: 700; }
.strap { margin: .35rem 0 .9rem; font-family: var(--mono); font-size: .82rem; color: var(--dim); }
.topnav { display: flex; flex-wrap: wrap; gap: 1.1rem; font-family: var(--mono); font-size: .78rem; }
.topnav a { color: var(--dim); text-decoration: none; padding-bottom: .2rem; }
.topnav a:hover { color: var(--ink); }
.topnav a[aria-current="page"] { color: var(--ink); box-shadow: inset 0 -2px 0 var(--accent); }

/* Body -------------------------------------------------------------------- */
main { padding: 2.4rem 0 3rem; }
h1 { font-family: var(--serif); font-size: clamp(1.7rem, 4vw, 2.4rem); line-height: 1.15; margin: 0 0 .5em; }
h2 { font-family: var(--serif); font-size: 1.3rem; margin: 0 0 .3em; }
.lede { max-width: var(--measure); font-size: 1.05rem; color: var(--dim); margin: 0 0 2.4rem; }
main p { max-width: var(--measure); }

.block { margin: 0 0 3.2rem; }
.block-head { margin-bottom: 1.2rem; }
.block-head p { margin: 0; color: var(--dim); font-size: .92rem; }

/* Tiles ------------------------------------------------------------------- */
.tiles { display: grid; gap: .8rem; grid-template-columns: 1fr; margin-bottom: 1.4rem; }
@media (min-width: 30rem) { .tiles { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 52rem) { .tiles { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 76rem) { .tiles { grid-template-columns: repeat(4, 1fr); } }
.tile {
  background: var(--surface); border: 1px solid var(--line);
  border-top: 2px solid var(--line); border-radius: 3px; padding: .95rem 1rem 1rem;
}
.tile-gap { border-top-color: var(--gap); }
.tile p { max-width: none; margin: 0; }
.tile-label {
  font-family: var(--mono); font-size: .68rem; text-transform: uppercase;
  letter-spacing: .06em; color: var(--dim);
}
.tile-value {
  font-family: var(--serif); font-size: 1.9rem; line-height: 1.1;
  margin: .3rem 0 .15rem !important; font-variant-numeric: tabular-nums;
}
.tile-gap .tile-value { color: var(--gap); }
.tile-sub { font-size: .78rem; color: var(--dim); margin-bottom: .5rem !important; }
.tile-note { font-size: .76rem; line-height: 1.5; color: var(--dim); border-top: 1px solid var(--line); padding-top: .5rem; }

/* Tables ------------------------------------------------------------------ */
.rows { width: 100%; border-collapse: collapse; margin: 0 0 1rem; font-size: .88rem; }
.rows th, .rows td { text-align: left; padding: .5rem .6rem; border-bottom: 1px solid var(--line); }
.rows th {
  font-family: var(--mono); font-size: .68rem; text-transform: uppercase;
  letter-spacing: .06em; color: var(--dim); font-weight: 400;
}
.rows .num { text-align: right; font-variant-numeric: tabular-nums; }

.source { font-family: var(--mono); font-size: .72rem; color: var(--dim); }

/* Limits ------------------------------------------------------------------ */
.limits { background: var(--panel); border: 1px solid var(--line); border-radius: 3px; padding: 1.4rem 1.5rem .6rem; }
.limits ul { margin: 0 0 1rem; padding-left: 1.1rem; max-width: var(--measure); }
.limits li { margin-bottom: .7rem; font-size: .92rem; line-height: 1.6; }

/* Method prose ------------------------------------------------------------ */
main h2 { margin-top: 2.2rem; }

/* Footer ------------------------------------------------------------------ */
.foot { border-top: 1px solid var(--line); background: var(--surface); padding: 1.6rem 0 2.2rem; }
.foot p { max-width: none; margin: 0; }
.foot-main { font-family: var(--serif); font-size: 1rem; }
.foot-meta { font-family: var(--mono); font-size: .72rem; color: var(--dim); margin-top: .4rem !important; }