/* ---------------------------------------------------------------------------
   One stylesheet, no build step, no framework.

   Light is the default and is defined on bare :root; dark only redefines the
   tokens. Anything that carries meaning here is a hash, a block number or a
   pass/fail — so the type is monospace-forward and the colour vocabulary is
   deliberately two states wide.
   ------------------------------------------------------------------------ */

:root {
  --bg:        #fbfbfa;
  --panel:     #ffffff;
  --ink:       #16161a;
  --ink-mute:  #5f6169;
  --ink-faint: #8b8d96;
  --rule:      #e3e3e0;
  --rule-firm: #cfcfca;
  --pass:      #14713d;
  --pass-bg:   #e8f5ec;
  --fail:      #a3122a;
  --fail-bg:   #fdeaed;
  --accent:    #16161a;

  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #0e0e10;
    --panel:     #171719;
    --ink:       #ededf0;
    --ink-mute:  #a1a1aa;
    --ink-faint: #6e6e78;
    --rule:      #26262a;
    --rule-firm: #35353b;
    --pass:      #4ade80;
    --pass-bg:   #10241a;
    --fail:      #f87171;
    --fail-bg:   #2a1216;
    --accent:    #ededf0;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-underline-offset: 3px; }

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

/* ── masthead ─────────────────────────────────────────────────────────── */

.masthead {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: baseline;
  justify-content: space-between;
  max-width: 60rem;
  margin: 0 auto;
  padding: 1.75rem 1.5rem 1.25rem;
  border-bottom: 1px solid var(--rule);
}

.wordmark {
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--ink);
}
.wordmark span { color: var(--ink-faint); font-weight: 400; }

.masthead nav { display: flex; gap: 1.5rem; }
.masthead nav a {
  font-size: 0.85rem;
  color: var(--ink-mute);
  text-decoration: none;
}
.masthead nav a:hover { color: var(--ink); }
.masthead nav a[aria-current="page"] {
  color: var(--ink);
  box-shadow: inset 0 -1px 0 var(--ink);
}

/* ── shared page shell ────────────────────────────────────────────────── */

main { max-width: 60rem; margin: 0 auto; padding: 2.5rem 1.5rem 4rem; }

.colophon {
  max-width: 60rem;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3rem;
  border-top: 1px solid var(--rule);
  color: var(--ink-faint);
  font-size: 0.8rem;
}
.colophon p { margin: 0.4rem 0; }
.colophon code { color: var(--ink-mute); }

/* ── the claim ────────────────────────────────────────────────────────── */

.claim {
  font-size: clamp(1.35rem, 3.2vw, 1.9rem);
  line-height: 1.35;
  letter-spacing: -0.02em;
  font-weight: 500;
  margin: 0 0 0.75rem;
  max-width: 34ch;
}
.claim-sub {
  color: var(--ink-mute);
  margin: 0 0 2.5rem;
  max-width: 62ch;
}

/* ── status panel ─────────────────────────────────────────────────────── */

.panel {
  background: var(--panel);
  border: 1px solid var(--rule-firm);
  border-radius: 10px;
  padding: 1.5rem;
  margin-bottom: 1.25rem;
}

.status-head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
}
.pill.pass { color: var(--pass); background: var(--pass-bg); }
.pill.fail { color: var(--fail); background: var(--fail-bg); }
.pill.idle { color: var(--ink-faint); background: var(--rule); }
.pill::before { content: "\25CF"; font-size: 0.7em; }

.checked-at { font-size: 0.8rem; color: var(--ink-faint); font-family: var(--mono); }

.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 1.25rem;
  margin: 0;
}
.facts div { min-width: 0; }
.facts dt {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  margin-bottom: 0.3rem;
}
.facts dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 1.05rem;
  font-variant-numeric: tabular-nums;
}

.root-row { margin-top: 1.5rem; padding-top: 1.25rem; border-top: 1px solid var(--rule); }
.root-row dt {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  margin-bottom: 0.4rem;
}
.root-hash {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.5;
  word-break: break-all;
  margin: 0;
}
.root-note { font-size: 0.8rem; color: var(--ink-mute); margin: 0.6rem 0 0; }

/* ── the two conformance conditions ───────────────────────────────────── */

.conditions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
  gap: 1rem;
  margin-bottom: 2.75rem;
}
.condition { padding: 1.15rem 1.25rem; }
.condition h3 {
  font-size: 0.95rem;
  margin: 0 0 0.15rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}
.condition .tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}
.condition .tag.pass { color: var(--pass); background: var(--pass-bg); }
.condition .tag.fail { color: var(--fail); background: var(--fail-bg); }
.condition .tag.idle { color: var(--ink-faint); background: var(--rule); }
.condition p { margin: 0.5rem 0 0; font-size: 0.85rem; color: var(--ink-mute); }

/* ── section headings ─────────────────────────────────────────────────── */

.section-title {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  margin: 0 0 0.9rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--rule);
}

/* ── history table ────────────────────────────────────────────────────── */

.table-scroll { overflow-x: auto; margin-bottom: 2.75rem; }

table.history {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}
table.history th {
  text-align: left;
  font-weight: 500;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  padding: 0 0.9rem 0.55rem 0;
  white-space: nowrap;
}
table.history td {
  padding: 0.5rem 0.9rem 0.5rem 0;
  border-top: 1px solid var(--rule);
  white-space: nowrap;
}
table.history td.root { color: var(--ink-mute); }
table.history td.ok   { color: var(--pass); }
table.history td.no   { color: var(--fail); font-weight: 600; }

/* ── prose (the spec page) ────────────────────────────────────────────── */

.prose { max-width: 46rem; }
.prose h1 {
  font-size: clamp(1.6rem, 4vw, 2.1rem);
  letter-spacing: -0.02em;
  margin: 0 0 1.5rem;
}
.prose h2 {
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  margin: 3rem 0 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
}
.prose h3 { font-size: 1rem; margin: 2rem 0 0.75rem; }
.prose p, .prose li { color: var(--ink); }
.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.25rem 0 0.25rem 1.25rem;
  border-left: 2px solid var(--rule-firm);
  color: var(--ink-mute);
}
.prose code {
  font-size: 0.87em;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}
.prose pre {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.5;
}
.prose pre code { background: none; border: 0; padding: 0; font-size: inherit; }
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
  margin: 1.5rem 0;
  display: block;
  overflow-x: auto;
}
.prose th {
  text-align: left;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  padding: 0 1rem 0.5rem 0;
  border-bottom: 1px solid var(--rule-firm);
}
.prose td { padding: 0.55rem 1rem 0.55rem 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }

/* ── honesty box ──────────────────────────────────────────────────────── */

.caveat {
  border: 1px solid var(--rule-firm);
  border-left: 3px solid var(--ink-faint);
  border-radius: 0 8px 8px 0;
  padding: 1.15rem 1.35rem;
  background: var(--panel);
}
.caveat h2 { font-size: 0.95rem; margin: 0 0 0.6rem; }
.caveat p  { margin: 0.5rem 0 0; font-size: 0.88rem; color: var(--ink-mute); }
.caveat p:first-of-type { margin-top: 0; }