:root {
  --paper: #FFFFFF;
  --sheet: #FAF8F5;
  --ink: #0A0A0A;
  --ink-soft: #5F5B55;
  --rule: #ECE8E2;
  --rule-strong: #DCD6CD;
  --tang: #0A0A0A;
  --tang-ink: #82633A;
  --tang-wash: #F5EFE6;
  --on-tang: #FFFFFF;
  --good: #2E6FDB;
  --good-wash: #E8F0FF;
  --good-mark: #bfe3c8;
  --bad: #a3261a;
  --bad-wash: #f8e2de;
  --bad-mark: #f1bfb6;
  --code: #F4F1EC;
  --round: 12px;
  --stack: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
    --check-b: #EEEAE4;
  }

:root[data-theme="dark"] {
    --paper: #000000;
    --sheet: #0F0E0D;
    --ink: #FFFFFF;
    --ink-soft: #A8A39C;
    --rule: #24221F;
    --rule-strong: #35322E;
    --tang: #FFFFFF;
    --tang-ink: #C9AE8A;
    --tang-wash: #1C1813;
    --good: #9CC0FF;
    --good-wash: #1B2740;
    --good-mark: #2c5a3a;
    --bad: #ff9a8c;
    --bad-wash: #3a1d19;
    --bad-mark: #6e2e26;
    --code: #171614;
    --on-tang: #000000;
    --check-a: #1A1917;
    --check-b: #111010;
  }

*, *::before, *::after { box-sizing: border-box; }

[hidden] { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.55 var(--stack);
}

h1, h2, h3, p, ul, ol, dl, dd { margin: 0; padding: 0; }

button, input, select, textarea { font: inherit; color: inherit; }

a { color: var(--tang-ink); }

code, pre { font-family: var(--mono); }

:focus-visible {
  outline: 3px solid var(--tang-ink);
  outline-offset: 2px;
}

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand svg { width: 28px; height: 28px; flex: none; }

.pledge {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-soft);
  font-size: 14px;
}

.pledge svg { width: 16px; height: 16px; flex: none; color: var(--tang-ink); }

.intro { padding: 56px 0 32px; max-width: 760px; }

.intro h1 {
  font-size: clamp(30px, 5vw, 46px);
  line-height: 1.08;
  letter-spacing: -0.025em;
}

.intro h1 em { font-style: normal; color: var(--tang-ink); }

.intro p {
  margin-top: 16px;
  color: var(--ink-soft);
  font-size: 18px;
}

.callout {
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--tang-wash);
  font-size: 14px;
}

.skw.tt-win { min-height: 640px; overflow: clip; }
@media (min-width: 1081px) { .tt-split > .tt-col:first-child:has(.tt-input:not([hidden])) { position: sticky; top: 12px; } }
.skw.tt-win #pane-count textarea.tt-tall { min-height: 480px; }
.tt-win .skw-side { gap: 1px; }
.tt-win .skw-nav[aria-selected="true"] { background: rgba(118,118,128,.16); font-weight: 600; }
.tt-ic { width: 18px; height: 18px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; color: var(--sk-muted, #6E6E73); }
.skw-nav[aria-selected="true"] .tt-ic { color: var(--sk-ink, #1D1D1F); }
.tt-win .skw-bar { min-height: 52px; }
.tt-pane { display: flex; flex-direction: column; flex: 1; min-width: 0; }
.tt-pane:focus { outline: none; }
.tt-split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px; align-items: start; }
.tt-col { display: grid; gap: 20px; min-width: 0; }
.tt-col > form { display: grid; gap: 20px; min-width: 0; }
.tt-input, .tt-res { display: grid; gap: 8px; min-width: 0; }
.tt-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 4px 12px; padding: 0 4px; }
.tt-h { margin: 0; font-size: 12.5px; font-weight: 600; color: var(--sk-muted, #6E6E73); }
.tt-mini, .tt-tally { font-size: 12.5px; color: var(--sk-muted, #6E6E73); font-variant-numeric: tabular-nums; }
.tt-tally:empty { display: none; }
.skw.tt-win textarea.tt-area { min-height: 260px; }
.skw.tt-win textarea.tt-tall { min-height: 340px; }
.skw.tt-win textarea[readonly] { background: rgba(118,118,128,.06); box-shadow: inset 0 0 0 1px rgba(0,0,0,.06); }
.skw.tt-win textarea[readonly]:focus { background: #fff; box-shadow: 0 0 0 1px var(--sk-accent, #5B8DEF), 0 0 0 4px rgba(91,141,239,.25); }
.skw.tt-win textarea.tt-mono, .skw.tt-win input.tt-mono { font: 13.5px/1.55 var(--mono); }
.tt-win .skw-row { cursor: default; }
.tt-win label.skw-row { cursor: pointer; }
.tt-win .skw-row:has(input:focus-visible) { box-shadow: inset 0 0 0 2px var(--sk-accent, #5B8DEF); border-radius: 12px; }
.tt-list input { position: absolute; opacity: 0; pointer-events: none; }
.tt-tick { width: 16px; height: 16px; flex: none; fill: none; stroke: var(--sk-accent, #5B8DEF); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; opacity: 0; transition: opacity .15s; }
.tt-list input:checked ~ .tt-tick { opacity: 1; }
.tt-list label:has(input:checked) > span:first-child { font-weight: 600; }
.tt-hint { margin: -8px 0 0; padding: 0 4px; font-size: 13px; line-height: 1.5; color: var(--sk-muted, #6E6E73); }
.tt-hint:empty { display: none; }
.tt-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.tt-fld { display: grid; gap: 6px; min-width: 0; }
.tt-fld > span { padding-left: 4px; font-size: 12.5px; font-weight: 600; color: var(--sk-muted, #6E6E73); }
.tt-num { width: 96px !important; text-align: right; font-variant-numeric: tabular-nums; }
.tt-win [aria-invalid="true"] { box-shadow: 0 0 0 1px #D93036, 0 0 0 4px rgba(217,48,54,.18) !important; }
.tt-err { display: flex; gap: 8px; padding: 10px 14px; border-radius: 12px; background: rgba(217,48,54,.08); color: #B42318; font-size: 13.5px; line-height: 1.45; }
.tt-err svg { width: 16px; height: 16px; margin-top: 2px; flex: none; }
.tt-win .cases { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.tt-win .cases label { position: relative; display: block; margin: 0; cursor: pointer; }
.tt-win .cases input { position: absolute; opacity: 0; pointer-events: none; }
.tt-win .cases span { display: block; padding: 11px 10px; border-radius: 11px; background: rgba(118,118,128,.08); font: 13px/1.3 var(--mono); text-align: center; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; transition: background .15s, box-shadow .15s; }
.tt-win .cases label:hover span { background: rgba(118,118,128,.14); }
.tt-win .cases input:checked + span { background: #fff; box-shadow: 0 0 0 2px var(--sk-accent, #5B8DEF), 0 1px 3px rgba(0,0,0,.08); font-weight: 600; }
.tt-win .cases input:focus-visible + span { outline: 2px solid var(--sk-accent, #5B8DEF); outline-offset: 2px; }
.tt-stats { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
.tt-stat { display: flex; flex-direction: column-reverse; gap: 2px; padding: 12px 14px; border-radius: 14px; background: rgba(118,118,128,.07); min-width: 0; }
.tt-stat dt { font-size: 12.5px; font-weight: 600; color: var(--sk-muted, #6E6E73); }
.tt-stat dd { font-size: 26px; font-weight: 700; line-height: 1.15; letter-spacing: -.02em; font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.focus-chars .stat-chars, .focus-chars .stat-nospace { order: -1; }
.focus-chars .stat-chars { background: rgba(91,141,239,.1); }
.tt-limits { list-style: none; }
.tt-limits li { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 4px 12px; padding: 10px 16px; font-size: 13.5px; }
.tt-limits li + li { box-shadow: inset 0 1px 0 rgba(0,0,0,.06); }
.tt-limits .num { color: var(--sk-muted, #6E6E73); font-variant-numeric: tabular-nums; }
.badge { display: inline-block; margin-left: 6px; padding: 1px 8px; border-radius: 999px; font-size: 12px; font-weight: 600; white-space: nowrap; font-variant-numeric: tabular-nums; }
.badge.is-good { background: rgba(91,152,255,.12); color: #2E6FDB; }
.badge.is-bad { background: rgba(229,72,77,.12); color: #C2272D; }
.tt-kwbar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px; }
.density { display: grid; gap: 8px; list-style: none; padding: 14px 16px; font-size: 13.5px; }
.density:empty { display: none; }
.density li { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr) auto; gap: 10px; align-items: center; }
.density .kw { overflow-wrap: anywhere; font-weight: 600; }
.density .bar { height: 6px; border-radius: 4px; background: rgba(118,118,128,.14); overflow: hidden; }
.density .bar i { display: block; height: 100%; border-radius: 4px; background: var(--sk-accent, #5B8DEF); }
.density .num { color: var(--sk-muted, #6E6E73); font-variant-numeric: tabular-nums; white-space: nowrap; }
.tt-none { padding: 14px 16px; font-size: 13.5px; color: var(--sk-muted, #6E6E73); }
.tt-diffin { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.skw.tt-win .tt-diffin textarea { min-height: 200px; }
.tt-opts { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; }
.tt-opts .tt-sw { display: inline-flex; align-items: center; gap: 8px; margin: 0; font-size: 13.5px; cursor: pointer; }
.tt-opts .tt-sp { flex: 1; }
.tt-diffhead { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 4px 12px; padding: 0 4px; margin-bottom: -12px; }
.diff-wrap { overflow: hidden; border-radius: 14px; background: rgba(118,118,128,.05); box-shadow: inset 0 0 0 1px rgba(0,0,0,.06); }
.diff-wrap > .empty { display: grid; place-items: center; min-height: 160px; padding: 24px; text-align: center; color: var(--sk-muted, #6E6E73); font: 14px/1.5 var(--stack); }
table.diff { width: 100%; border-collapse: collapse; table-layout: fixed; font: 13px/1.55 var(--mono); }
.diff td { padding: 1px 8px; vertical-align: top; white-space: pre-wrap; overflow-wrap: anywhere; }
.diff td.num { width: 3.6em; padding-right: 6px; color: var(--sk-muted, #6E6E73); text-align: right; user-select: none; }
.diff td.mark { width: 1.6em; padding: 1px 0 1px 4px; color: var(--sk-muted, #6E6E73); user-select: none; }
.diff.is-split td.txt + td.num { border-left: 1px solid rgba(0,0,0,.06); }
.diff .del { background: #FCEBEC; }
.diff .add { background: #E7F6EE; }
.diff .gap { background: rgba(118,118,128,.06); }
.diff del, .flow del { background: #F6C9CB; color: inherit; text-decoration: none; border-radius: 3px; }
.diff ins, .flow ins { background: #BFE8D1; color: inherit; text-decoration: none; border-radius: 3px; }
.diff tr.fold td { padding: 0; }
.fold button { display: block; width: 100%; min-height: 32px; padding: 4px 10px; border: 0; background: rgba(118,118,128,.08); color: var(--sk-muted, #6E6E73); font: 600 12.5px/1.4 var(--stack); text-align: center; cursor: pointer; }
.fold button:hover { background: rgba(118,118,128,.14); color: var(--sk-ink, #1D1D1F); }
.flows { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0; }
.flows.is-inline { grid-template-columns: minmax(0, 1fr); }
.flow { min-width: 0; padding: 12px 14px; font: 13.5px/1.6 var(--mono); white-space: pre-wrap; overflow-wrap: anywhere; }
.flows .flow + .flow, .flows > div + div { border-left: 1px solid rgba(0,0,0,.06); }
.flow-head { padding: 8px 14px; border-bottom: 1px solid rgba(0,0,0,.06); color: var(--sk-muted, #6E6E73); font: 600 12.5px/1.4 var(--stack); }

.prose {
  margin-top: 88px;
  padding: 56px 0 24px;
  border-top: 1px solid var(--rule);
}

.prose > * { max-width: 720px; }

.prose h2 {
  margin: 48px 0 12px;
  font-size: 26px;
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.prose h2:first-child { margin-top: 0; }

.prose h3 { margin: 24px 0 4px; font-size: 17px; }

.prose p + p, .prose p + ul, .prose ul + p { margin-top: 12px; }

.prose ul { padding-left: 20px; }

.prose li { margin-top: 8px; }

.prose p, .prose li { color: var(--ink-soft); }

.prose strong { color: var(--ink); }

.prose code {
  padding: 1px 5px;
  border-radius: 5px;
  background: var(--code);
  color: var(--ink);
  font-size: 0.92em;
  overflow-wrap: anywhere;
}

.colophon {
  margin-top: 40px;
  padding: 24px 0 48px;
  border-top: 1px solid var(--rule);
  color: var(--ink-soft);
  font-size: 14px;
}

.colophon a { color: inherit; }

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (max-width: 1080px) {
  .tt-split { grid-template-columns: minmax(0, 1fr); }
  .skw.tt-win textarea.tt-area, .skw.tt-win textarea.tt-tall { min-height: 200px; }
}

@media (max-width: 900px) {
  .skw.tt-win { min-height: 0; }
}

@media (max-width: 640px) {
  .tt-diffin, .flows, .tt-fields { grid-template-columns: minmax(0, 1fr); }
  .flows .flow + .flow, .flows > div + div { border-left: 0; border-top: 1px solid rgba(0,0,0,.06); }
  .diff td.num { width: 2.6em; padding: 1px 4px 1px 2px; }
  .diff td { padding: 1px 5px; font-size: 12px; }
  .tt-win .cases { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tt-stat dd { font-size: 22px; }
}

@media (max-width: 560px) {
  .wrap { padding: 0 16px; }
  .masthead { flex-direction: column; align-items: flex-start; gap: 6px; padding: 16px 0; }
  .intro { padding: 36px 0 24px; }
  .intro p { font-size: 17px; }
  .prose { margin-top: 56px; padding-top: 40px; }
  .tt-win .skw-row .tt-num { width: 96px !important; max-width: 96px; }
  .tt-win .skw-foot .skw-acts { width: 100%; justify-content: flex-end; }
}

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

@media (pointer: coarse) {
  input:not([type=checkbox]):not([type=radio]):not([type=range]), select, textarea { font-size: 16px !important; }
}