/* p-rick — paper pages (reading edition of each working paper)
   Companion to assets/style.css; loads only on paper/*.html.
   Identity: scholarly journal page — hairline rules, margin contents,
   crimson accents, Fraunces display / Inter UI / Plex Mono apparatus. */

/* ── head ─────────────────────────────────────────────── */
.paper { padding: clamp(2.2rem, 5vw, 3.8rem) 0 0; }
.paper-head { border-bottom: var(--rule-w) solid var(--rule); padding-bottom: 1.7rem; }

.paper-kicker {
  font-family: var(--mono);
  font-size: var(--step--1);
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1rem;
}
.paper-title {
  font-family: var(--serif);
  font-size: var(--step-3);
  font-weight: 540;
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
  max-width: 30ch;
}
.paper-meta {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.02em;
  color: var(--text);
  margin: 0 0 1.5rem;
  line-height: 1.9;
}
.paper-meta a { color: var(--muted); border-bottom: 1px solid var(--rule-strong); }
.paper-meta a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.rev-flag {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  border: var(--rule-w) solid var(--rule-strong);
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
}

.paper-actions { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.paper-actions .pa {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--text);
  text-decoration: none;
  border: var(--rule-w) solid var(--rule-strong);
  border-radius: 3px;
  padding: 0.5rem 0.9rem;
  white-space: nowrap;
  background: var(--bg);
  transition: border-color 140ms ease, color 140ms ease, background 140ms ease, transform 140ms ease;
}
.paper-actions .pa::before { font-size: 0.9em; color: var(--faint); transition: color 140ms ease; }
.paper-actions .pa[download]::before { content: "\2193"; }
.paper-actions .pa[href^="https://github.com"]::before { content: "\2197"; }
.paper-actions .pa:hover { border-color: var(--accent); color: var(--accent); background: var(--bg-soft); transform: translateY(-1px); }
.paper-actions .pa:hover::before { color: var(--accent); }
.paper-actions .pa:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.paper-actions .pa-lead {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
  font-weight: 500;
}
.paper-actions .pa-lead:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ── revision note ────────────────────────────────────── */
.paper-revision {
  margin: 1.8rem 0 0;
  padding: 0.95rem 1.4rem 0 0;
  border-left: 2px solid var(--accent);
  background: none;
  border-radius: 0;
}
.paper-revision .rev-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.35rem;
}
.paper-revision p { margin: 0; font-family: var(--serif); font-size: 0.92rem; line-height: 1.66; color: var(--text); }

/* ── abstract ─────────────────────────────────────────── */
.paper-abstract {
  margin: 2.1rem 0 0;
  padding: 1.5rem 1.7rem 1.3rem;
  border: var(--rule-w) solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: 0 6px 6px 0;
  background: var(--bg-raise);
}
.abs-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 0.6rem;
}
.abs-text {
  font-family: var(--serif);
  font-size: var(--step-0);
  line-height: 1.68;
  margin: 0 0 1rem;
  color: var(--text);
}
.abs-kw {
  border-top: var(--rule-w) solid var(--rule);
  padding-top: 0.7rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--muted);
  line-height: 2;
}
.abs-kw .kw-label { text-transform: uppercase; letter-spacing: 0.12em; color: var(--faint); margin-right: 0.6rem; }
.abs-kw .kw { color: var(--muted); }
.abs-kw .kw::after { content: " ·"; color: var(--rule-strong); }
.abs-kw .kw:last-child::after { content: ""; }

/* ── layout: contents rail + body ─────────────────────── */
.paper-layout {
  display: grid;
  grid-template-columns: minmax(150px, 210px) minmax(0, 1fr);
  column-gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
  margin-top: 2.4rem;
}
.paper-toc { position: sticky; top: 5.6rem; padding-bottom: 2rem; }
.ptoc-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--faint);
  padding-bottom: 0.55rem;
  border-bottom: var(--rule-w) solid var(--rule);
  margin-bottom: 0.55rem;
}
.paper-toc ol { list-style: none; margin: 0; padding: 0; counter-reset: toc; }
.paper-toc ol li { border-bottom: var(--rule-w) solid var(--rule); }
.paper-toc ol li:last-child { border-bottom: none; }
.paper-toc a {
  display: flex;
  gap: 0.5rem;
  align-items: baseline;
  padding: 0.42rem 0.2rem 0.42rem 0.55rem;
  border-left: 2px solid transparent;
  margin-left: -0.55rem;
  font-family: var(--sans);
  font-size: 0.8rem;
  line-height: 1.45;
  color: var(--muted);
  text-decoration: none;
  transition: color 120ms ease, border-color 120ms ease;
}
.paper-toc a .tocn { font-family: var(--mono); font-size: 0.68rem; color: var(--faint); flex: none; min-width: 1.7em; }
.paper-toc a:hover { color: var(--ink); }
.paper-toc a.on { color: var(--accent); border-left-color: var(--accent); font-weight: 500; }
.paper-toc a.on .tocn { color: var(--accent); }
.paper-toc ol li.toc-sub a { padding-left: 1.2rem; }
.paper-toc .toc-extra { list-style: none; margin: 0.55rem 0 0; padding: 0; }
.paper-toc .toc-extra a { border-bottom: none; padding: 0.25rem 0; font-size: 0.76rem; color: var(--faint); }

/* ── body typography ──────────────────────────────────── */
.paper-body { max-width: 72ch; padding-bottom: 1.5rem; }
.paper-body p {
  font-family: var(--serif);
  font-size: var(--step-0);
  line-height: 1.74;
  margin: 0 0 1.2rem;
  color: var(--text);
}
.paper-body p:first-of-type::first-letter {
  font-size: 3.1em;
  float: left;
  line-height: 0.82;
  padding: 0.06em 0.09em 0 0;
  font-weight: 500;
  color: var(--accent);
}
.paper-body h2 {
  font-family: var(--serif);
  font-size: var(--step-1);
  font-weight: 560;
  line-height: 1.25;
  margin: 2.9rem 0 1.1rem;
  padding-top: 1.1rem;
  border-top: var(--rule-w) solid var(--rule);
  color: var(--ink);
}
.paper-body h2:first-child { margin-top: 0; padding-top: 0; border-top: none; }
.paper-body h2 .secno {
  font-family: var(--mono);
  font-size: 0.72em;
  font-weight: 500;
  color: var(--accent);
  margin-right: 0.75em;
}
.paper-body h3 {
  font-family: var(--serif);
  font-size: 1.08rem;
  font-weight: 580;
  margin: 2rem 0 0.8rem;
  color: var(--ink);
}
.paper-body h4 {
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 600;
  margin: 1.5rem 0 0.6rem;
  color: var(--ink);
}
.paper-body ul, .paper-body ol { margin: 0 0 1.15rem; padding-left: 1.5rem; }
.paper-body li { font-family: var(--serif); font-size: var(--step-0); line-height: 1.68; margin-bottom: 0.5rem; color: var(--text); }
.paper-body li::marker { color: var(--accent); font-family: var(--mono); font-size: 0.8em; }
.paper-body blockquote {
  margin: 1.3rem 0;
  padding: 0.35rem 0 0.35rem 1.1rem;
  border-left: 3px solid var(--rule-strong);
  color: var(--muted);
}
.paper-body blockquote p { font-style: italic; margin: 0; color: var(--muted); }
.paper-body code {
  font-family: var(--mono);
  font-size: 0.83em;
  background: var(--bg-soft);
  border: var(--rule-w) solid var(--rule);
  border-radius: 3px;
  padding: 0.08em 0.32em;
}
.paper-body a { color: var(--text); border-bottom: 1px solid var(--rule-strong); text-decoration: none; }
.paper-body a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.paper-body hr { border: none; border-top: var(--rule-w) solid var(--rule); margin: 2.4rem 0; }
.paper-body pre.code {
  background: var(--bg-soft);
  border: var(--rule-w) solid var(--rule);
  border-radius: 5px;
  padding: 0.95rem 1.1rem;
  overflow-x: auto;
  margin: 1.3rem 0;
}
.paper-body pre.code code { background: none; border: none; padding: 0; font-size: 0.78rem; line-height: 1.55; }

/* theorem / lemma boxes */
.paper-body .thm {
  margin: 1.5rem 0;
  padding: 1rem 1.2rem 0.85rem;
  background: var(--bg-soft);
  border-left: 2px solid var(--rule-strong);
  border-radius: 0 4px 4px 0;
}
.paper-body .thm p { margin: 0; font-size: var(--step-0); }
.paper-body .thm .thm-head {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-right: 0.5em;
}

/* figures */
.paper-body figure.paper-fig {
  margin: 2.2rem 0;
  border: var(--rule-w) solid var(--card-border);
  border-radius: 6px;
  background: var(--fig-bg);
  overflow: hidden;
}
.paper-fig img { display: block; width: 100%; height: auto;
  transition: filter 0.18s ease; }
.paper-fig figcaption {
  display: flex;
  gap: 0.6rem;
  align-items: baseline;
  padding: 0.7rem 0.95rem 0.75rem;
  border-top: var(--rule-w) solid var(--rule);
  font-family: var(--sans);
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--muted);
}
.paper-fig .fig-no {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--accent);
  flex: none;
}
.paper-fig a { border-bottom: none; cursor: zoom-in; display: block;
  position: relative; }
/* lightbox affordance: figures open in the page overlay, not a new tab */
.paper-fig a::after {
  content: '\2295';           /* circled plus, reads as "expand" */
  position: absolute; right: 0.6rem; bottom: 0.6rem;
  width: 30px; height: 30px; border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 1rem; line-height: 1;
  color: #fff; background: rgba(0, 0, 0, 0.45);
  opacity: 0; transition: opacity 0.18s ease;
  pointer-events: none;
}
.paper-fig a:hover::after, .paper-fig a:focus-visible::after { opacity: 1; }
.paper-fig:hover img { filter: brightness(0.985); }
@media (prefers-reduced-motion: reduce) {
  .paper-fig img { transition: none; }
  .paper-fig a::after { transition: none; }
}

/* tables */
.tbl-wrap { overflow-x: auto; margin: 1.6rem 0; }
table.paper-table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.85rem;
  min-width: 40%;
}
.paper-table th {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  text-align: left;
  color: var(--muted);
  padding: 0.5rem 0.7rem 0.45rem;
  border-bottom: 2px solid var(--rule-strong);
}
.paper-table td {
  font-family: var(--serif);
  font-size: 0.86rem;
  line-height: 1.5;
  padding: 0.55rem 0.7rem;
  border-bottom: var(--rule-w) solid var(--rule);
  color: var(--text);
  vertical-align: top;
}
.paper-table td.ta-center, .paper-table th.ta-center { text-align: center; }
.paper-table td.ta-right, .paper-table th.ta-right { text-align: right; font-variant-numeric: tabular-nums; }
.paper-table tbody tr:last-child td { border-bottom: none; }
.paper-table td code, .paper-table td .katex { font-size: 0.92em; }

/* references list */
.paper-body .refs-list ol, .paper-body ol.refs { padding-left: 1.7rem; }
.paper-body ol li { margin-bottom: 0.6rem; }

/* math */
.katex { font-size: 1.03em; }
.katex-display { margin: 1.4rem 0; overflow-x: auto; overflow-y: hidden; padding: 0.15rem 0.1rem; }
.katex-display > .katex { white-space: normal; }
.math-display { text-align: center; }
.paper-body p .katex { color: inherit; }

/* ── prev / next ──────────────────────────────────────── */
.paper-nav {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 1.5rem;
  align-items: center;
  border-top: var(--rule-w) solid var(--rule);
  margin-top: 2.6rem;
  padding: 1.4rem 0 0.4rem;
}
.paper-nav .pn {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  text-decoration: none;
  padding: 0.3rem 0.6rem;
  border-radius: 4px;
  transition: background 140ms ease;
}
.paper-nav .pn:hover { background: var(--accent-soft); }
.paper-nav .pn-k { font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--faint); }
.paper-nav .pn-t { font-family: var(--serif); font-size: 0.9rem; line-height: 1.4; color: var(--text); }
.paper-nav .pn:hover .pn-t { color: var(--accent); }
.paper-nav .pn-next { text-align: right; }
.paper-nav .pn-all { text-align: center; justify-content: center; }

/* ── cite block ───────────────────────────────────────── */
.paper-cite { margin-top: 2.2rem; padding-top: 1.4rem; border-top: var(--rule-w) solid var(--rule); }
.cite-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 0.7rem;
}
.paper-cite .bibtex-block {
  font-family: var(--mono);
  font-size: 0.74rem;
  line-height: 1.6;
  background: var(--bg-soft);
  border: var(--rule-w) solid var(--rule);
  border-radius: 5px;
  padding: 0.9rem 1.1rem;
  overflow-x: auto;
  color: var(--text);
  margin: 0 0 0.9rem;
  white-space: pre;
}
.cite-note { font-family: var(--sans); font-size: 0.8rem; line-height: 1.6; color: var(--muted); margin: 0; }

/* ── responsive ───────────────────────────────────────── */
@media (max-width: 1020px) {
  .paper-layout { grid-template-columns: minmax(0, 1fr); }
  .paper-toc {
    position: static;
    margin-bottom: 0.6rem;
    border: var(--rule-w) solid var(--rule);
    border-radius: 5px;
    background: var(--bg-raise);
    padding: 0.9rem 1.1rem;
  }
  .ptoc-label { border-bottom: none; margin-bottom: 0.2rem; }
  .paper-toc ol { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); column-gap: 1.4rem; }
  .paper-toc ol li { border-bottom: none; }
  .paper-toc a { padding: 0.3rem 0; }
}
@media (max-width: 720px) {
  .paper-title { max-width: none; }
  .paper-nav { grid-template-columns: 1fr; }
  .paper-nav .pn-next { text-align: left; }
  .paper-nav .pn-all { order: 3; text-align: left; }
  .paper-abstract { padding: 1.15rem 1.05rem 1rem; }
  .abs-text { line-height: 1.75; font-size: 0.95rem; }
  .paper-actions .pa { flex: 1 1 44%; justify-content: center; padding: 0.55rem 0.6rem; }
  .paper-head { padding-bottom: 2rem; }
}

/* ── print ────────────────────────────────────────────── */
@media print {
  .paper-toc, .paper-actions, .paper-nav, .theme-toggle, .site-header, .site-footer, .paper-cite .bibtex-block { display: none !important; }
  .paper-layout { grid-template-columns: 1fr; }
  .paper-body { max-width: none; }
  .paper-abstract, .paper-revision { background: none; border-color: #999; }
  .paper-fig { break-inside: avoid; }
}

/* ── selection & focus (app apparatus) ────────────────── */
::selection { background: var(--accent-soft); color: var(--ink); }
.paper-body a:focus-visible, .paper-toc a:focus-visible, .paper-fig a:focus-visible,
.paper-cite a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }