@charset "UTF-8";
/* ============================================================
   Noisy-observation recovery / logistic map — research record
   Shared stylesheet for readme_en.html and readme_ja.html
   Mobile-first. No external assets, no web fonts.
   ============================================================ */

:root {
  --paper:      #f6f7f9;
  --panel:      #ffffff;
  --panel-alt:  #f0f3f7;
  --ink:        #17212c;
  --ink-soft:   #4d5a6a;
  --ink-faint:  #7c8899;
  --rule:       #dde3ea;
  --rule-hard:  #c2ccd8;
  --accent:     #2f4f8f;
  --accent-bg:  #e9eef8;
  --recovered:  #0e6f52;
  --abstain:    #8a5b00;
  --wrong:      #ab2118;
  --wrong-bg:   #fbecea;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
          "Liberation Mono", "Courier New", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue",
          "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP",
          "Yu Gothic", Meiryo, Arial, sans-serif;
  --wrap: 60rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:     #11161c;
    --panel:     #171e26;
    --panel-alt: #1d2731;
    --ink:       #e6ebf1;
    --ink-soft:  #b0bccb;
    --ink-faint: #8593a4;
    --rule:      #2a3440;
    --rule-hard: #3b4856;
    --accent:    #8fb0e8;
    --accent-bg: #1b2534;
    --recovered: #59c39c;
    --abstain:   #d6a34a;
    --wrong:     #f08a80;
    --wrong-bg:  #2b1c1b;
  }
}

* { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 4.5rem;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  overflow-wrap: break-word;
  word-break: normal;
}

/* ---------- header / footer nav ---------- */

.bar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--panel);
  border-bottom: 1px solid var(--rule-hard);
}

.bar-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0.5rem 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.75rem;
}

.bar-mark {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-right: auto;
}

.bar a {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--ink);
  text-decoration: none;
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--rule-hard);
  border-radius: 2px;
  white-space: nowrap;
}

.bar a:hover,
.bar a:focus-visible { background: var(--accent-bg); color: var(--accent); }

.bar a[aria-current="page"] {
  background: var(--accent-bg);
  color: var(--accent);
  border-color: var(--accent);
}

.site-foot {
  border-top: 1px solid var(--rule-hard);
  background: var(--panel);
  margin-top: 3rem;
}

.site-foot .bar-inner { padding: 1.25rem 1rem 2rem; }

.foot-note {
  flex-basis: 100%;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--ink-faint);
  margin: 0;
}

/* ---------- page shell ---------- */

main {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 1.5rem 1rem 0;
}

.hero { padding: 0.5rem 0 1.5rem; border-bottom: 1px solid var(--rule); }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 0.6rem;
}

h1 {
  font-size: 1.55rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
  margin: 0 0 0.75rem;
}

.lede { font-size: 1rem; color: var(--ink-soft); margin: 0 0 1rem; }

.stamp {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-faint);
  margin: 0;
}

/* headline figures — the four fixed counts */
.figs {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
  margin: 1.25rem 0 0;
  padding: 0;
}

.figs li {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  padding: 0.6rem 0.7rem;
}

.figs b {
  display: block;
  font-family: var(--mono);
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.figs span {
  display: block;
  font-size: 0.72rem;
  line-height: 1.45;
  color: var(--ink-faint);
}

.figs .is-wrong { border-left-color: var(--wrong); }
.figs .is-wrong b { color: var(--wrong); }

/* ---------- table of contents ---------- */

.toc {
  background: var(--panel);
  border: 1px solid var(--rule);
  margin: 1.5rem 0;
}

.toc > summary {
  cursor: pointer;
  padding: 0.7rem 1rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.toc ol { margin: 0; padding: 0 1rem 1rem 2.2rem; font-size: 0.9rem; }
.toc li { margin: 0.2rem 0; }
.toc a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--rule-hard); }
.toc a:hover { color: var(--accent); }
.toc .toc-group {
  list-style: none;
  margin-left: -1.2rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding-top: 0.6rem;
}

/* ---------- part dividers ---------- */

.part {
  margin: 2.5rem 0 1.5rem;
  padding: 1rem 0 0;
  border-top: 3px double var(--rule-hard);
}

.part h2 { font-size: 1.3rem; margin: 0.3rem 0 0.4rem; }
.part p { margin: 0; color: var(--ink-soft); font-size: 0.9rem; }

/* ---------- sections ---------- */

section { padding: 1.25rem 0; border-bottom: 1px solid var(--rule); }
section:last-of-type { border-bottom: 0; }

h2 { font-size: 1.2rem; line-height: 1.4; margin: 0 0 0.75rem; letter-spacing: -0.01em; }
h3 { font-size: 1rem; margin: 1.75rem 0 0.5rem; letter-spacing: 0.01em; }
h4 { font-size: 0.9rem; margin: 1.25rem 0 0.4rem; color: var(--ink-soft); }

h2 .num, h3 .num {
  font-family: var(--mono);
  font-size: 0.72em;
  color: var(--accent);
  margin-right: 0.5rem;
  letter-spacing: 0.04em;
}

p { margin: 0 0 0.9rem; }

ul, ol { margin: 0 0 0.9rem; padding-left: 1.3rem; }
li { margin: 0.3rem 0; }

a { color: var(--accent); }

strong { font-weight: 700; }

code, kbd {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--panel-alt);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 0.05em 0.3em;
  word-break: break-all;
}

pre {
  background: var(--panel-alt);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--rule-hard);
  padding: 0.8rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1.6;
  -webkit-overflow-scrolling: touch;
}

pre code { background: none; border: 0; padding: 0; font-size: 1em; word-break: normal; }

/* ---------- formulas ---------- */

.formula {
  display: block;
  background: var(--panel);
  border: 1px solid var(--rule);
  padding: 0.7rem 0.8rem;
  margin: 0 0 0.9rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  overflow-x: auto;
  white-space: pre;
  -webkit-overflow-scrolling: touch;
}

/* ---------- tables ---------- */

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--rule);
  background: var(--panel);
  margin: 0 0 0.5rem;
}

table { border-collapse: collapse; width: 100%; font-size: 0.85rem; min-width: 20rem; }

caption {
  caption-side: top;
  text-align: left;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 0.6rem 0.7rem 0.3rem;
}

th, td {
  border-bottom: 1px solid var(--rule);
  padding: 0.5rem 0.7rem;
  text-align: left;
  vertical-align: top;
}

thead th {
  background: var(--panel-alt);
  font-size: 0.76rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--ink-soft);
  white-space: nowrap;
}

tbody tr:last-child th,
tbody tr:last-child td { border-bottom: 0; }

td.num, th.num { text-align: right; font-family: var(--mono); white-space: nowrap; }
td.mono, th.mono { font-family: var(--mono); font-size: 0.8rem; }
tr.is-focus td, tr.is-focus th { background: var(--wrong-bg); }

.scroll-hint {
  font-size: 0.72rem;
  color: var(--ink-faint);
  margin: 0 0 0.9rem;
  font-family: var(--mono);
}

/* ---------- status chips ---------- */

.chip {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  padding: 0.08em 0.45em;
  border: 1px solid currentColor;
  border-radius: 2px;
  white-space: nowrap;
}

.chip-rec  { color: var(--recovered); }
.chip-abs  { color: var(--abstain); }
.chip-wr   { color: var(--wrong); background: var(--wrong-bg); }
.chip-est  { color: var(--accent); }

/* ---------- callouts ---------- */

.note, .caution, .scope {
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  background: var(--panel);
  padding: 0.8rem 0.9rem;
  margin: 0 0 1rem;
  font-size: 0.9rem;
}

.note > :last-child,
.caution > :last-child,
.scope > :last-child { margin-bottom: 0; }

.caution { border-left-color: var(--wrong); }
.scope { border-left-color: var(--rule-hard); background: var(--panel-alt); }

.note-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 0.35rem;
}

.caution .note-label { color: var(--wrong); }

/* ---------- incident card (signature element) ---------- */

.incident {
  border: 1px solid var(--rule-hard);
  background: var(--panel);
  margin: 0 0 1.25rem;
}

.incident-head {
  padding: 0.75rem 0.9rem;
  border-bottom: 1px solid var(--rule);
  background: var(--wrong-bg);
}

.incident-head p {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--ink);
}

.incident-body { padding: 0.9rem; }
.incident-body dl { margin: 0; font-size: 0.85rem; }

.incident-body dt {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 0.6rem;
}

.incident-body dt:first-child { margin-top: 0; }
.incident-body dd { margin: 0.1rem 0 0; font-family: var(--mono); font-size: 0.9rem; }
.incident-body dd.wrong { color: var(--wrong); }

/* ---------- hash strings ---------- */

.hash { font-family: var(--mono); font-size: 0.72rem; word-break: break-all; color: var(--ink-soft); }

.back-top {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  text-decoration: none;
  margin-top: 0.5rem;
}

.back-top:hover { color: var(--accent); }

/* ---------- desktop ---------- */

@media (min-width: 48rem) {
  body { font-size: 17px; }
  main { padding: 2.5rem 2rem 0; }
  h1 { font-size: 2.1rem; }
  h2 { font-size: 1.4rem; }
  h3 { font-size: 1.1rem; }
  .figs { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .part h2 { font-size: 1.6rem; }
  table { font-size: 0.9rem; }
  .scroll-hint { display: none; }
}

/* ---------- very small phones ---------- */

@media (max-width: 22.5rem) {
  body { font-size: 15px; }
  main { padding: 1rem 0.75rem 0; }
  .bar-inner { padding: 0.4rem 0.75rem; }
  .bar a { font-size: 0.72rem; padding: 0.25rem 0.45rem; }
  .figs { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

@media print {
  .bar, .toc, .scroll-hint, .back-top { display: none; }
  body { background: #fff; color: #000; font-size: 10pt; }
  .table-scroll { overflow: visible; }
  section { page-break-inside: avoid; }
}