/* Editorial research desk: choose at the left edge, read at the right.
   Pane width follows chapter labels; prose measure follows sustained reading. */
#about-overlay .about-pane[data-about-pane="research"].active {
  display: flex; flex: 1; min-height: 0; overflow: hidden;
  padding: 0; margin: 0; width: 100%; max-width: none;
}
#research-content {
  display: grid; grid-template-columns: 300px minmax(0, 1fr);
  flex: 1; height: 100%; min-height: 0; max-height: none;
  width: 100%; max-width: none; margin: 0; padding: 0; overflow: hidden;
}
#research-content .rp-index {
  min-width: 0; min-height: 0; overflow-y: auto; overscroll-behavior: contain;
  padding: 24px; border-right: 1px solid var(--rule);
}
#research-content .rp-index-head h2 { font-size: 22px; font-weight: 600; line-height: 1.35; margin: 0 0 8px; }
#research-content .rp-index-head p { font-size: 14px; line-height: 1.6; color: var(--ink-mid); margin: 0 0 8px; }
#research-content .rp-language { display: flex; gap: 4px; margin-bottom: 12px; }
#research-content .rp-language button {
  min-height: 44px; min-width: 44px; padding: 8px; border: 0; border-radius: 0;
  font: 500 14px/1.4 var(--font-ui); color: var(--ink); background: none;
}
#research-content .rp-language button[aria-pressed="true"] { text-decoration: underline; text-underline-offset: 5px; }
#research-content .rp-toc { position: static; margin: 0; padding: 0; background: none; }
#research-content .rp-toc summary { display: none; }
#research-content .rp-toc details[open] { max-height: none; overflow: visible; }
#research-content .rp-toc-list { margin: 0; }
#research-content .rp-toc-list a {
  display: block; min-height: 44px; padding: 10px 0;
  border: 0; font-size: 14px; line-height: 1.5; color: var(--ink-mid);
}
#research-content .rp-toc-list a.active { color: var(--ink); font-weight: 600; text-decoration: underline; text-underline-offset: 4px; }
#research-content .rp-reading {
  min-width: 0; min-height: 0; overflow: auto; overscroll-behavior: contain;
  padding: 24px clamp(20px, 3vw, 48px) 64px;
}
#research-content .rp-paper { max-width: 72ch; margin: 0 auto; font-size: 16px; line-height: 1.7; }
#research-content .rp-hero { padding: 0; margin: 0 0 32px; }
#research-content .rp-hero-eyebrow { font-size: 12px; margin: 0 0 10px; }
#research-content .rp-hero-title { font-size: clamp(26px, 2.5vw, 34px); line-height: 1.3; margin: 0 0 16px; font-weight: 600; }
#research-content .rp-hero-meta { font-size: 13px; line-height: 1.6; }
#research-content .rp-abstract { margin: 16px 0 0; }
#research-content :is(.rp-abstract p, .rp-section p, .rp-lead) { max-width: 65ch; font-size: 16px; line-height: 1.7; }
#research-content .rp-section { padding: 0; margin: 0 0 36px; scroll-margin-top: 24px; min-width: 0; }
#research-content .rp-section h2 { font-size: 26px; line-height: 1.35; font-weight: 600; margin: 0 0 16px; padding: 0; border: 0; }
#research-content .rp-section h3 { font-size: 20px; line-height: 1.4; font-weight: 600; margin: 24px 0 10px; }
#research-content :is(.rp-section-v2, .rp-section-why, .rp-design-contract, .rp-contract-list li, .rp-figure--photo) {
  border: 0; border-image: none; box-shadow: none; border-radius: 0; background: none; padding: 0;
}
#research-content .rp-blockquote { border: 0; padding: 0; margin: 16px 0; }
#research-content .rp-blockquote p { font-size: 22px; line-height: 1.5; font-weight: 500; }
#research-content .rp-design-contract { margin: 24px 0; }
#research-content .rp-contract-list { gap: 16px; }
#research-content .rp-contract-list li { grid-template-columns: 32px minmax(0, 1fr); gap: 12px; }
#research-content .rp-contract-num { font-size: 22px; color: var(--ink); }
#research-content .rp-contract-list li .rp-contract-num { color: var(--ink); }
#research-content .rp-pipeline-grid { display: block; }
#research-content .rp-pipeline-card { display: grid; grid-template-columns: 24px minmax(0, 1fr); gap: 12px; padding: 16px 0; border: 0; background: none; }
#research-content .rp-pipeline-name { font-size: 18px; font-weight: 600; }
#research-content :is(.rp-pipeline-note, .rp-pipeline-agency, .rp-pipeline-link) { font-size: 14px; line-height: 1.6; }
#research-content .rp-tag { border: 0; background: none; padding: 0; font-size: 13px; }
#research-content .rp-figure { margin: 20px 0; padding: 0; max-width: 100%; overflow-x: auto; }
#research-content .rp-figure--photo img { max-height: none; object-fit: contain; border: 0; }
#research-content :is(.rp-fig-cap, .rp-figure--photo figcaption) { font-size: 13px; line-height: 1.6; padding: 8px 0 0; letter-spacing: 0; border: 0; }
#research-content table { display: block; max-width: 100%; overflow-x: auto; font-size: 14px; }
#research-content :is(a, button, summary):focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
#research-content .rp-reading:focus-visible { outline: 2px solid var(--ink); outline-offset: -3px; }
@media (max-width: 999px) {
  #research-content { grid-template-columns: minmax(0, 1fr); grid-template-rows: auto minmax(0, 1fr); }
  #research-content .rp-index { padding: 8px 16px; overflow: visible; border: 0; }
  #research-content .rp-index-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
  #research-content .rp-index-head h2 { font-size: 18px; margin: 0; }
  #research-content .rp-index-head p { display: none; }
  #research-content .rp-language { margin: 0; }
  #research-content .rp-toc summary { display: list-item; list-style-position: inside; padding: 10px 0; }
  #research-content .rp-toc details[open] { max-height: 40dvh; overflow-y: auto; }
  #research-content .rp-reading { padding: 16px 16px 48px; }
  #research-content .research-svg { min-width: 560px; }
}
#research-content .rp-citations li { font-size: 14px; line-height: 1.7; margin-bottom: 8px; }
#research-content .rp-download-section { padding: 0; border: 0; background: none; }
#research-content .rp-download-actions { align-items: flex-start; gap: 12px; }
#research-content .rp-download-btn { min-height: 44px; padding: 10px 14px; border: 1px solid var(--rule); background: none; color: var(--ink); font-weight: 500; }
#research-content .rp-download-btn:hover { background: var(--well-dim); }
#research-content .rp-download-icon { display: none; }
#research-content .rp-download-meta { font-size: 13px; line-height: 1.6; }
/* A reading-room toolbar, sized to actions rather than stretched plates. */
#about-overlay .about-head {
  height: 52px; min-height: 52px; padding: 0 16px; gap: 16px;
  background: var(--paper); color: var(--ink); border-bottom: 1px solid var(--rule);
}
#about-overlay .about-head .sign { flex: none; }
#about-overlay .about-head .sign .en { display: none; }
#about-overlay .about-tabs { margin: 0; gap: 4px; }
#about-overlay .about-tab, #about-overlay #about-close {
  border: 0; border-radius: 0; background: none; color: var(--ink);
  opacity: 1; min-height: 44px; padding: 8px 12px; font-size: 13px;
}
#about-overlay .about-tab.active { text-decoration: underline; text-underline-offset: 5px; }
#about-overlay .about-tab:hover, #about-overlay #about-close:hover { background: var(--well-dim); color: var(--ink); }
#about-overlay .about-tab .en-lbl { display: none; }
#research-content .rp-history summary { min-height: 44px; padding: 8px 0; cursor: pointer; }
#research-content .rp-history summary h2 { display: inline; font-size: 18px; line-height: 1.5; margin: 0; }
#research-content .rp-section-v2 { margin-bottom: 24px; }
@media(max-width: 720px) {
  #about-overlay .about-head { height: auto; padding: 4px 16px; gap: 0 12px; }
  #about-overlay .about-head > .about-tabs { width: 100%; }
}
#research-content .rp-paper { min-width: 0; }
#research-content .rp-paper a { overflow-wrap: anywhere; }
#research-content pre { max-width: 100%; overflow-x: auto; }
#research-content code { overflow-wrap: anywhere; }
#research-content pre code { white-space: pre; overflow-wrap: normal; }
#research-content .rp-blockquote p { color: var(--ink); }
#research-content .rp-figure:focus-visible { outline: 2px solid var(--ink); outline-offset: -2px; }

#research-content .rp-formula { margin: 20px 0; }
#research-content .rp-formula p { margin: 8px 0; }
#research-content .rp-formula code { font-size: 16px; line-height: 1.7; white-space: normal; }

/* One warm editorial accent separates methods from operational AQI colours. */
#research-content { --rp-accent: #985020; }
@media (prefers-color-scheme: dark) { #research-content { --rp-accent: #E5A04A; } }
#research-content .rp-hero-title { color: var(--rp-accent); margin-bottom: 8px; }
#research-content .rp-deck { font-size: 18px; line-height: 1.5; margin: 0 0 20px; color: var(--ink); }
#research-content .rp-section h2 { color: var(--rp-accent); }
#research-content .rp-section h3 { color: var(--ink); }
#research-content .rp-hero-eyebrow { color: var(--ink-mid); }
#research-content .rp-hero-meta { margin-top: 20px; }
#research-content .rp-evidence-flow { margin: 20px 0; }
#research-content .rp-evidence-flow figcaption { font-size: 18px; font-weight: 600; margin-bottom: 12px; color: var(--ink); }
#research-content .rp-evidence-flow ol { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; list-style: none; padding: 0; margin: 0; }
#research-content .rp-evidence-flow li { position: relative; min-width: 0; }
#research-content .rp-evidence-flow li + li::before { content: '→'; position: absolute; left: -20px; top: 0; color: var(--ink-mid); }
#research-content .rp-evidence-flow strong { display: block; font-size: 18px; line-height: 1.5; color: var(--rp-accent); margin-bottom: 8px; }
#research-content .rp-evidence-flow span { display: block; font-size: 16px; line-height: 1.6; color: var(--ink); }
#research-content .rp-evidence-flow small { display: block; font-size: 13px; line-height: 1.6; color: var(--ink-mid); margin-top: 8px; }
#research-content .rp-toc-list a.active { color: var(--rp-accent); }
@media (max-width: 999px) {
  #research-content .rp-index-head h2 { font-size: 16px; }
  #research-content .rp-toc summary { padding: 4px 0; min-height: 44px; }
  #research-content .rp-hero { margin-bottom: 24px; }
}
@media (max-width: 560px) {
  #research-content .rp-evidence-flow ol { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  #research-content .rp-evidence-flow li { padding-left: 24px; }
  #research-content .rp-evidence-flow li + li::before { content: '↓'; left: 0; top: 0; }
  #research-content .rp-evidence-flow strong { margin-bottom: 4px; }
  #research-content .rp-evidence-flow small { margin-top: 4px; }
}

/* Preprint pane — the PDF is the content, so there is no header band above it:
   one 48px sticky toolbar carries identity, zoom, page and the three downloads. */
#about-overlay .about-pane[data-about-pane="preprint"] { padding: 0; max-width: none; margin: 0; }
.pp-bar {
  position: sticky; top: 0; z-index: 2; display: flex; align-items: center; gap: 2px;
  min-height: 48px; padding: 0 clamp(4px, 3vw, 32px);
  background: var(--paper); border-bottom: 1px solid var(--rule);
}
.pp-id { flex: 1 1 0; min-width: 0; margin: 0 8px 0 0; font-size: 13px; line-height: 1.3; color: var(--ink-mid); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.pp-id b { color: var(--ink); font-weight: 600; }
.pp-tool {
  display: inline-flex; align-items: center; justify-content: center; min-width: 44px; min-height: 44px;
  border: 0; background: none; color: var(--ink); font: 600 20px/1 var(--font-ui); cursor: pointer;
}
.pp-tool:disabled { opacity: .35; cursor: default; }
.pp-zoom, .pp-page { min-width: 3.2em; text-align: center; font: 500 13px/1 var(--font-num, var(--font-ui)); font-variant-numeric: tabular-nums; color: var(--ink-mid); }
.pp-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-width: 44px; min-height: 44px; padding: 0 12px; box-sizing: border-box;
  color: var(--ink); font: 600 13px/1.2 var(--font-ui); text-decoration: none; white-space: nowrap;
}
.pp-btn:hover { background: var(--well); }
.pp-primary, .pp-primary:hover { background: var(--ink); color: var(--ink-inv); }
.pp-glyph { font: 600 15px/1 var(--font-ui); }
.pp-tool:focus-visible, .pp-btn:focus-visible, .pp-view:focus-visible { outline: 3px solid var(--ink); outline-offset: -3px; }
.pp-note { margin: 0; padding: 10px clamp(12px, 4vw, 48px); font-size: 14px; line-height: 1.55; color: var(--ink); border-bottom: 1px solid var(--rule); }
.pp-load { margin: 0; padding: 16px clamp(12px, 4vw, 48px); font-size: 14px; color: var(--ink-mid); }
.pp-view { overflow-x: auto; padding: 12px clamp(8px, 3vw, 32px) 48px; background: var(--rule); }
.pp-page-slot { margin: 0 auto 12px; background: #fff; box-shadow: 0 1px 3px rgba(14, 74, 94, .3); }
.pp-page-slot canvas { display: block; }
.pp-page-slot:empty::after { content: attr(data-label); display: block; padding-top: 12px; text-align: center; font: 500 13px/1 var(--font-ui); color: var(--ink-low); }
@media (max-width: 899px) { .pp-lbl { display: none; } .pp-btn { padding: 0; } }
@media (max-width: 699px) { .pp-id { display: none; } .pp-page { margin-left: auto; } }