/* HackerPapers styles.
   Two typographic worlds: the papers are set in Latin Modern Roman (LaTeX), the chrome
   around them in Verdana (Hacker News). One accent, HN orange, never as large text on white. */

@font-face {
  font-family: "Latin Modern Roman";
  src: url("fonts/lmroman10-regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Latin Modern Roman";
  src: url("fonts/lmroman10-bold.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Latin Modern Roman";
  src: url("fonts/lmroman10-italic.woff2") format("woff2");
  font-weight: 400;
  font-style: italic;
  font-display: swap;
}

:root {
  color-scheme: light dark;
  /* white paper */
  --paper: #ffffff;
  --ink: #000000;
  --ink-2: #303030;
  --meta: #666666;
  --rule: #dddddd;
  --stub: #d4d4d4;
  --hn: #ff6600;
  --field: #ffffff;
  --sheet: #ffffff;
  --shade: rgba(0, 0, 0, 0.35);

  --serif: "Latin Modern Roman", "Latin Modern Roman 10", "CMU Serif", "Computer Modern", Georgia, serif;
  --sans: Verdana, Geneva, "DejaVu Sans", "Bitstream Vera Sans", sans-serif;

  --fs-chrome: 13px;
  --fs-meta: 12px;
  --fs-small: 11px;
  --fs-text: 17px;
  --fs-row: 19px;
  --fs-h2: 22px;
  --fs-h1: 30px;
  --fs-paper: 28px;

  --measure: 66ch;
  --width: 920px;
  --gutter: 16px;
}

/* blackboard, not an inverted page: slate green, chalk, the same orange */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #1f2622;
    --ink: #ebe7db;
    --ink-2: #d2cdbf;
    --meta: #9ea8a0;
    --rule: #36403a;
    --stub: #414b45;
    --field: #171d19;
    --sheet: #262e29;
    --shade: rgba(0, 0, 0, 0.55);
  }
}
:root[data-theme="dark"] {
  --paper: #1f2622;
  --ink: #ebe7db;
  --ink-2: #d2cdbf;
  --meta: #9ea8a0;
  --rule: #36403a;
  --stub: #414b45;
  --field: #171d19;
  --sheet: #262e29;
  --shade: rgba(0, 0, 0, 0.55);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--fs-chrome);
  line-height: 1.45;
}

a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }

:focus-visible { outline: 2px solid var(--hn); outline-offset: 2px; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

kbd {
  font-family: var(--sans);
  font-size: var(--fs-small);
  color: var(--meta);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 0 4px;
  line-height: 1.5;
  display: inline-block;
}

svg { display: block; }

.wrap {
  max-width: var(--width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.vh {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ---------- chrome: header ---------- */

.top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  padding: 14px 0 10px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand-mark { width: 14px; height: 14px; color: var(--hn); align-self: center; }
.brand-hacker { font: 700 15px/1 var(--sans); letter-spacing: -0.01em; }
.brand-papers { font: 400 21px/1 var(--serif); margin-left: -4px; }

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav li + li::before { content: "|"; color: var(--rule); margin-right: 4px; }
.nav a {
  color: var(--meta);
  padding: 2px 0;
}
.nav a[aria-current="page"] {
  color: var(--ink);
  box-shadow: inset 0 -2px 0 var(--hn);
}

.tools {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: auto;
}

.search {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--rule);
  background: var(--field);
  padding: 3px 6px 3px 8px;
  border-radius: 2px;
}
.search:focus-within { border-color: var(--ink); }
.search input {
  font: inherit;
  color: var(--ink);
  background: none;
  border: 0;
  padding: 0;
  width: 190px;
  outline: none;
}
.search input::placeholder { color: var(--meta); }

.theme {
  color: var(--meta);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.theme::before {
  content: "";
  width: 9px; height: 9px;
  border: 1px solid currentColor;
  border-radius: 50%;
  display: inline-block;
}
.theme[aria-pressed="true"]::before { background: currentColor; }
.theme:hover { color: var(--ink); text-decoration: underline; }
.theme .on { display: none; }
:root[data-theme="dark"] .theme .on { display: inline; }
:root[data-theme="dark"] .theme .off { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme .on { display: inline; }
  :root:not([data-theme="light"]) .theme .off { display: none; }
}

/* ---------- hero ---------- */

.hero { padding: 26px 0 10px; }
.hero h1 {
  font: 400 var(--fs-h1)/1.25 var(--serif);
  margin: 0 0 12px;
  max-width: 30em;
  text-wrap: balance;
  letter-spacing: -0.005em;
}
.hero-stats {
  color: var(--meta);
  margin: 0 0 24px;
  max-width: 60em;
}
.hero-stats b { color: var(--ink); font-weight: 400; }

.corpus { max-width: 760px; }
.corpus svg {
  width: 100%;
  height: 110px;
  color: var(--ink-2);
}
.corpus .bar { fill: currentColor; }
.corpus .bar.peak { fill: var(--hn); }
.axis {
  display: flex;
  font-size: var(--fs-small);
  color: var(--meta);
  margin-top: 4px;
  border-top: 1px solid var(--rule);
  padding-top: 3px;
}
.axis span { flex: 1 1 0; text-align: center; min-width: 0; }
.caption {
  font: italic 15px/1.4 var(--serif);
  color: var(--ink-2);
  margin: 12px 0 0;
  max-width: 60ch;
}
.caption b { font-style: normal; font-weight: 400; }

/* ---------- view header ---------- */

.view-head {
  padding: 22px 0 6px;
}
.view-head h2 {
  font: 400 var(--fs-h2)/1.25 var(--serif);
  margin: 0 0 4px;
}
.view-head h2 .cat-id { font-family: var(--sans); font-size: 14px; color: var(--meta); margin-right: 10px; }
.view-head p { margin: 0; color: var(--meta); max-width: 70ch; }
.view-head p b { color: var(--ink); font-weight: 400; }
.view-head p a { color: var(--ink); text-decoration: underline; text-decoration-color: var(--rule); }
.view-head p a:hover { text-decoration-color: currentColor; }

.subnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0 4px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
  color: var(--meta);
}
.subnav li + li::before { content: "|"; color: var(--rule); margin-right: 4px; }
.subnav a[aria-current="true"] { color: var(--ink); box-shadow: inset 0 -2px 0 var(--hn); }

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0 0;
}
.btn {
  font-size: var(--fs-chrome);
  color: var(--ink);
  border: 1px solid var(--ink-2);
  border-radius: 2px;
  padding: 4px 10px;
  background: var(--paper);
}
.btn:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn[disabled] { opacity: 0.5; cursor: default; }
.btn[disabled]:hover { background: var(--paper); color: var(--ink); }

/* ---------- list rows ---------- */

.list {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
}

.row {
  display: grid;
  grid-template-columns: var(--rank-w, 2.6em) minmax(0, 1fr) 118px 8.4em;
  grid-template-areas: "rank main spark counts";
  column-gap: 14px;
  align-items: start;
  padding: 11px 0 11px 8px;
  margin-left: -8px;
}
.row.cur { box-shadow: inset 3px 0 0 var(--hn); }

.rank {
  grid-area: rank;
  color: var(--meta);
  text-align: right;
  font-variant-numeric: tabular-nums;
  padding-top: 5px;
}

.main { grid-area: main; min-width: 0; }

.title {
  font: 400 var(--fs-row)/1.3 var(--serif);
  color: var(--ink);
  display: inline;
}
.title:visited { color: var(--meta); }
.row.saved .title { }

.authors {
  font: 400 15px/1.35 var(--serif);
  color: var(--ink-2);
  margin-top: 2px;
}

.meta {
  color: var(--meta);
  font-size: var(--fs-meta);
  margin-top: 4px;
  display: flex;
  flex-wrap: wrap;
  gap: 0 4px;
}
.meta > * + *::before { content: "|"; color: var(--rule); margin-right: 4px; }
.meta a:hover, .meta button:hover { text-decoration: underline; color: var(--ink); }
.meta .save { font-size: inherit; color: inherit; }
.row.saved .save { color: var(--ink); }
.row.saved .save::after {
  content: "";
  display: inline-block;
  width: 7px; height: 7px;
  background: var(--hn);
  margin-left: 5px;
  vertical-align: 0;
}

.spark {
  grid-area: spark;
  width: 118px;
  height: 26px;
  color: var(--ink-2);
  margin-top: 4px;
}
.spark .bar { fill: currentColor; }
.spark .bar.peak { fill: var(--hn); }
.spark .bar.zero { fill: var(--stub); opacity: 0.8; }

.counts {
  grid-area: counts;
  text-align: right;
  font-size: var(--fs-meta);
  color: var(--meta);
  line-height: 1.5;
  padding-top: 3px;
  font-variant-numeric: tabular-nums;
}
.counts span { display: block; white-space: nowrap; }
.counts b { color: var(--ink); font-weight: 700; font-size: var(--fs-chrome); }

.more {
  padding: 18px 0 8px;
  color: var(--meta);
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.empty {
  padding: 28px 0;
  color: var(--ink-2);
  max-width: 60ch;
  font: 400 var(--fs-text)/1.5 var(--serif);
}
.empty kbd { font-size: var(--fs-meta); }

/* fields view */
.group { padding: 24px 0 8px; }
.group + .group { border-top: 1px solid var(--rule); }
.group h3 {
  font: 400 var(--fs-h2)/1.25 var(--serif);
  margin: 0 0 2px;
}
.group h3 a:hover { text-decoration: underline; }
.group-meta { color: var(--meta); margin: 0; }
.group-meta b { color: var(--ink); font-weight: 400; }
.group .list { margin-top: 2px; }
.group .row { padding: 8px 0 8px 8px; }
.cats {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 2px 14px;
  font-size: var(--fs-meta);
  color: var(--meta);
}
.cats a { color: var(--ink); }
.cats a .n { color: var(--meta); }
.cats a:hover { text-decoration: underline; }
.group-all { margin: 10px 0 0; }
.group-all a { color: var(--ink); text-decoration: underline; text-decoration-color: var(--rule); }
.group-all a:hover { text-decoration-color: currentColor; }

/* years view */
.years {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  max-width: 560px;
}
.years li {
  display: grid;
  grid-template-columns: 3.2em 1fr 5.5em;
  align-items: center;
  gap: 10px;
  padding: 3px 0;
}
.years a { color: var(--ink); font-variant-numeric: tabular-nums; }
.years a:hover { text-decoration: underline; }
.years .ybar { height: 12px; background: var(--ink-2); min-width: 1px; }
.years .ybar.peak { background: var(--hn); }
.years .n { color: var(--meta); text-align: right; font-variant-numeric: tabular-nums; font-size: var(--fs-meta); }
.years li.zero a, .years li.zero .n { color: var(--stub); }
.years li.zero .ybar { background: var(--stub); }

/* ---------- shortcut sheet ---------- */

.sheet[hidden] { display: none; }
.sheet {
  position: fixed;
  inset: 0;
  background: var(--shade);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 10vh 16px;
  z-index: 10;
}
.sheet-box {
  background: var(--sheet);
  color: var(--ink);
  border: 1px solid var(--rule);
  border-radius: 3px;
  padding: 18px 22px 20px;
  width: 100%;
  max-width: 440px;
  max-height: 80vh;
  overflow: auto;
}
.sheet-box h2 {
  font: 400 20px/1.2 var(--serif);
  margin: 0 0 12px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.sheet-box h2 button { color: var(--meta); font-size: var(--fs-meta); }
.sheet-box dl {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 7px 16px;
  align-items: baseline;
}
.sheet-box dt { text-align: right; white-space: nowrap; }
.sheet-box dd { margin: 0; color: var(--ink-2); }

/* toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--paper);
  padding: 7px 14px;
  border-radius: 3px;
  font-size: var(--fs-chrome);
  z-index: 11;
  max-width: calc(100vw - 32px);
}
.toast[hidden] { display: none; }

/* ---------- footer ---------- */

.foot {
  margin-top: 48px;
  padding: 16px 0 40px;
  border-top: 1px solid var(--rule);
  color: var(--meta);
  font-size: var(--fs-meta);
  line-height: 1.6;
}
.foot p { margin: 0 0 4px; max-width: 80ch; }
.foot a { color: var(--ink); }
.foot a:hover { text-decoration: underline; }

/* ---------- paper page ---------- */

.crumbs {
  color: var(--meta);
  font-size: var(--fs-meta);
  margin: 14px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0 4px;
}
.crumbs > * + *::before { content: "/"; color: var(--rule); margin-right: 4px; }
.crumbs a:hover { color: var(--ink); }

.paper {
  position: relative;
  padding: 28px 0 8px;
}

/* the arXiv stamp: horizontal above the title; vertical in the left margin when there is room */
.stamp {
  font-family: var(--sans);
  font-size: var(--fs-meta);
  color: var(--ink-2);
  margin: 0 0 22px;
  white-space: nowrap;
}
.stamp .stamp-cat::before { content: " ["; }
.stamp .stamp-cat::after { content: "]"; }
.stamp time { margin-inline-start: 0.6em; }

.paper-head { text-align: center; }
.paper-title {
  font: 700 var(--fs-paper)/1.2 var(--serif);
  margin: 0 auto 14px;
  max-width: 26em;
  text-wrap: balance;
}
.paper-authors {
  font: 400 16px/1.5 var(--serif);
  color: var(--ink);
  margin: 0 auto 26px;
  max-width: 52em;
}

.abstract {
  max-width: var(--measure);
  margin: 0 auto;
  font: 400 var(--fs-text)/1.5 var(--serif);
  color: var(--ink);
}
.abstract h2 {
  font: 700 15px/1.3 var(--serif);
  text-align: center;
  margin: 0 0 8px;
}
.abstract p { margin: 0; hyphens: auto; }

.arxiv-meta {
  max-width: var(--measure);
  margin: 18px auto 0;
  font: 400 15px/1.5 var(--serif);
  color: var(--ink-2);
}
.arxiv-meta div { display: flex; gap: 8px; }
.arxiv-meta div:has(> dd:empty) { display: none; }
.arxiv-meta dt { flex: none; }
.arxiv-meta dt::after { content: ":"; }
.arxiv-meta dd { margin: 0; min-width: 0; overflow-wrap: anywhere; }
.arxiv-meta dd a { text-decoration: underline; text-decoration-color: var(--rule); }
.arxiv-meta dd a:hover { text-decoration-color: currentColor; }
.arxiv-meta .cats-row { font: inherit; color: inherit; gap: 0 14px; }
.arxiv-meta .cats-row .cat { color: var(--ink); text-decoration: none; }
.arxiv-meta .cats-row .cat:hover { text-decoration: underline; }
.arxiv-meta .cats-row .cat .cat-name { color: var(--meta); }

.paper-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0 4px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  color: var(--meta);
}
.paper-links li + li::before { content: "|"; color: var(--rule); margin-right: 4px; }
.paper-links a, .paper-links button { color: var(--ink); }
.paper-links a:hover, .paper-links button:hover { text-decoration: underline; }
.paper-links li:empty { display: none; }
.paper-links .save[aria-pressed="true"]::after {
  content: "";
  display: inline-block;
  width: 7px; height: 7px;
  background: var(--hn);
  margin-left: 5px;
}

/* the fold: paper above, Hacker News below */
.hn {
  margin-top: 40px;
  border-top: 1px solid var(--rule);
  padding-top: 18px;
}
.hn h2 {
  font: 700 15px/1.4 var(--sans);
  margin: 28px 0 10px;
}
.hn h2 .n { color: var(--meta); font-weight: 400; margin-left: 8px; }
.hn > h2:first-child { margin-top: 0; }

.hn-summary {
  margin: 0 0 14px;
  color: var(--meta);
  max-width: 70ch;
}
.hn-summary b { color: var(--ink); font-weight: 700; }

.hist-wrap { max-width: 760px; }
.hist-wrap .hist {
  width: 100%;
  height: 72px;
  color: var(--ink-2);
}
.hist-bar { fill: currentColor; }
.hist-bar.peak { fill: var(--hn); }
.hist-bar[data-n="0"] { fill: var(--stub); }

/* section wrappers: hidden when the build fills nothing in */
.fill:empty { display: none; }
section:has(> .fill:empty) { display: none; }
.sect-empty { display: none; }

/* threads, the markup contract from SPEC */
.threads {
  list-style: none;
  margin: 0;
  padding: 0;
}
.thread { margin: 0 0 22px; }
.thread-head { margin-bottom: 6px; }
.thread-title { font-size: 14px; color: var(--ink); }
.thread-meta { color: var(--meta); font-size: var(--fs-meta); margin-left: 6px; white-space: nowrap; }
.thread-meta .thread-count::before { content: "|"; color: var(--rule); margin: 0 4px; }
.comments {
  list-style: none;
  margin: 0;
  padding: 0 0 0 12px;
  border-left: 2px solid var(--rule);
}
.comment + .comment { margin-top: 10px; }
.comment-text {
  margin: 0 0 3px;
  color: var(--ink-2);
  max-width: 76ch;
  line-height: 1.5;
  overflow-wrap: anywhere;
}
.comment-meta { margin: 0; color: var(--meta); font-size: var(--fs-meta); }
.comment-meta > * + *::before { content: "|"; color: var(--rule); margin: 0 4px; }
.comment-meta a:hover { color: var(--ink); text-decoration: underline; }
.threads-more { color: var(--meta); margin: 0; }

.stories, .related {
  list-style: none;
  margin: 0;
  padding: 0;
}
.story, .related-item { margin: 0 0 8px; }
.story-title { font-size: 14px; color: var(--ink); }
.story-meta, .related-meta { color: var(--meta); font-size: var(--fs-meta); margin-left: 6px; white-space: nowrap; }
.story-meta > * + *::before, .related-meta > * + *::before { content: "|"; color: var(--rule); margin: 0 4px; }

.related-title { font: 400 17px/1.3 var(--serif); color: var(--ink); }
.related-meta { display: block; margin-left: 0; margin-top: 1px; white-space: normal; }

.cats-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  margin: 0;
  color: var(--meta);
  font-size: var(--fs-meta);
}
.cats-row .cat { color: var(--ink); }
.cats-row .cat .cat-name { color: var(--meta); }
.cats-row .cat .cat-name::before { content: " "; }
.cats-row .cat:hover { text-decoration: underline; }

/* ---------- about page ---------- */

.prose {
  max-width: var(--measure);
  font: 400 var(--fs-text)/1.5 var(--serif);
  padding-top: 24px;
}
.prose h1 { font: 400 var(--fs-h1)/1.25 var(--serif); margin: 0 0 18px; }
.prose h2 { font: 700 18px/1.3 var(--serif); margin: 32px 0 8px; }
.prose p, .prose li { margin: 0 0 10px; }
.prose a { text-decoration: underline; text-decoration-color: var(--rule); }
.prose a:hover { text-decoration-color: currentColor; }
.prose ul { padding-left: 1.2em; }
.prose .files { list-style: none; padding: 0; }
.prose .files li { margin-bottom: 6px; }
.prose .files .what { color: var(--meta); font-family: var(--sans); font-size: var(--fs-meta); margin-left: 8px; }
.prose table { border-collapse: collapse; font: 400 var(--fs-chrome)/1.5 var(--sans); margin: 6px 0 10px; }
.prose td { padding: 4px 18px 4px 0; vertical-align: baseline; }
.prose td:first-child { white-space: nowrap; }
.prose code { font-family: var(--sans); font-size: var(--fs-chrome); color: var(--ink-2); }

/* ---------- responsive ---------- */

@media (min-width: 1100px) {
  .stamp {
    position: absolute;
    left: -46px;
    top: 36px;
    margin: 0;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    font-size: 13px;
  }
}

@media (max-width: 700px) {
  :root {
    --fs-h1: 24px;
    --fs-paper: 23px;
    --fs-row: 18px;
    --fs-text: 16px;
  }
  .top { gap: 8px 14px; }
  .nav { gap: 2px 14px; }
  .nav li + li::before { content: none; margin: 0; }
  .tools { margin-left: 0; width: 100%; justify-content: space-between; }
  .search input { width: 130px; }
  .corpus svg { height: 84px; }
  .axis span:nth-child(even) { visibility: hidden; }
  .row {
    grid-template-columns: var(--rank-w, 2.2em) minmax(0, 1fr);
    grid-template-areas:
      "rank main"
      "rank foot";
    column-gap: 10px;
    row-gap: 6px;
  }
  .spark, .counts {
    grid-area: foot;
  }
  .spark { margin-top: 0; justify-self: start; align-self: center; }
  .counts {
    justify-self: end;
    text-align: right;
    padding-top: 0;
    display: flex;
    gap: 0 10px;
    flex-wrap: wrap;
    justify-content: flex-end;
    align-items: baseline;
  }
  .counts span { display: inline; }
  .hist-wrap .hist { height: 56px; }
  .abstract p { hyphens: manual; }
  .paper-authors { margin-bottom: 20px; }
  .hist-years span:nth-child(even) { visibility: hidden; }
  .sheet { padding: 5vh 12px; }
  .sheet-box dl { grid-template-columns: auto 1fr; }
}

@media (prefers-reduced-motion: no-preference) {
  .btn, .nav a, .meta .save { transition: color 120ms, background-color 120ms; }
}

@media print {
  .top, .tools, .sheet, .toast, .more { display: none !important; }
}

/* Research desk: clearer hierarchy, comfortable controls, no remote assets. */
:root { --width: 1120px; --gutter: 24px; --paper: #faf9f6; --ink: #212720; --ink-2: #384037; --rule: #deded5; --field: #fff; --sheet: #fff; --fs-row: 21px; }
:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; --paper: #1b231e; --ink: #eeeade; --ink-2: #d2d4c8; --meta: #a6b0a5; --rule: #39433c; --field: #202b24; --sheet: #202b24; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --paper: #1b231e; --ink: #eeeade; --ink-2: #d2d4c8; --meta: #a6b0a5; --rule: #39433c; --field: #202b24; --sheet: #202b24; }
}
[hidden] { display: none !important; }
html { scroll-padding-top: 24px; }
.skip-link { position: fixed; z-index: 30; top: 12px; left: 12px; padding: 12px 18px; background: var(--ink); color: var(--paper); transform: translateY(-180%); }
.skip-link:focus { transform: none; }
.top { padding: 22px 0 16px; border-bottom: 1px solid var(--rule); gap: 14px 28px; align-items: center; }
.brand-hacker { font-size: 17px; }
.brand-papers { font-size: 25px; }
.brand-mark { width: 18px; height: 18px; }
.nav { gap: 0 16px; }
.nav li + li::before { content: none; }
.nav a { display: inline-block; padding: 8px 0; }
.tools { width: 100%; justify-content: space-between; }
.search { flex: 1; max-width: 520px; padding: 10px 12px; border-radius: 4px; }
.search input { width: 100%; min-width: 0; }
.theme { min-height: 40px; }
.hero { display: grid; grid-template-columns: 1.1fr 1fr; gap: 30px 56px; padding: 50px 0 25px; border-bottom: 1px solid var(--rule); align-items: center; }
.eyebrow { font: 11px/1.5 var(--sans); letter-spacing: .12em; text-transform: uppercase; color: var(--meta); margin: 0 0 16px; }
.hero h1 { font-size: clamp(36px, 4.6vw, 54px); line-height: 1.03; letter-spacing: -.025em; text-wrap: initial; margin-bottom: 20px; }
.hero-intro { max-width: 43ch; color: var(--ink-2); font-size: 14px; line-height: 1.7; margin: 0; }
.hero-links { display: flex; gap: 12px 22px; flex-wrap: wrap; margin-top: 20px; font-size: 12px; }
.hero-links a { border-bottom: 1px solid var(--rule); padding-bottom: 5px; }
.hero-links span { color: var(--hn); margin-left: 4px; }
.hero-stats { grid-column: 1 / -1; max-width: none; margin: 4px 0 0; font-size: 12px; line-height: 1.8; border-top: 1px solid var(--rule); padding-top: 18px; }
.hero-stats b { font-weight: 700; }
.corpus { margin: 0; min-width: 0; }
.corpus svg { height: 125px; }
.corpus .caption { font-size: 14px; max-width: none; line-height: 1.5; }
.corpus .axis span:nth-child(even) { visibility: hidden; }
.view-head { padding-top: 26px; }
.view-head h2 { font-size: 30px; }
.view-head > p { line-height: 1.7; margin-top: 8px; }
.subnav { margin-bottom: 12px; gap: 18px; }
.subnav li + li::before { content: none; }
.subnav a { display: inline-block; padding-bottom: 6px; }
.filter-bar { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 20px; padding: 16px; border: 1px solid var(--rule); border-radius: 5px; background: var(--field); }
.filter-field { display: flex; flex-direction: column; gap: 7px; flex: 1 1 150px; min-width: 0; color: var(--meta); font-size: 11px; }
.filter-field:first-child { flex-grow: 2; }
.filter-field select { font: 12px/1.4 var(--sans); color: var(--ink); border: 1px solid var(--rule); border-radius: 3px; background: var(--paper); min-width: 0; max-width: 100%; width: 100%; min-height: 40px; padding: 8px; }
.filter-summary { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px 16px; color: var(--meta); margin: 12px 0 10px; font-size: 12px; }
.filter-summary .actions { margin: 0; }
.btn { min-height: 38px; padding: 8px 13px; border-color: var(--rule); border-radius: 4px; display: inline-flex; align-items: center; justify-content: center; }
.row { padding-top: 18px; padding-bottom: 18px; border-bottom: 1px solid var(--rule); grid-template-columns: var(--rank-w, 2.6em) minmax(0,1fr) 118px 8.4em; column-gap: 20px; }
.row:hover, .row.cur { background: var(--field); }
.title { line-height: 1.35; overflow-wrap: anywhere; }
.authors { margin-top: 5px; }
.meta { margin-top: 6px; align-items: center; gap: 3px 8px; }
.meta > * + *::before { content: none; }
.meta a, .meta button { padding: 4px 0; }
.meta .preview-paper { color: var(--ink); text-decoration: underline; text-decoration-color: var(--rule); text-underline-offset: 3px; }
.rank { padding-top: 6px; font-size: 11px; }
.counts b { font-size: 18px; font-weight: 400; }
.counts span + span { margin-top: 3px; }
.spark { margin-top: 9px; }
.group { margin-top: 10px; }
.group h3 { margin-bottom: 8px; }
.group .row { padding-block: 14px; }
.cats { gap: 8px 18px; }
.paper-jumps { display: flex; flex-wrap: wrap; gap: 8px 22px; padding-top: 18px; font-size: 12px; color: var(--meta); }
.paper-jumps a { padding: 5px 0; }
.paper-title { font-size: clamp(26px, 3.1vw, 36px); }
.paper-links { gap: 8px; }
.paper-links li + li::before { content: none; }
.paper-links a, .paper-links button { display: inline-flex; min-height: 40px; align-items: center; padding: 7px 12px; border: 1px solid var(--rule); border-radius: 3px; }
.paper-links a:hover, .paper-links button:hover { background: var(--field); }
.thread { padding: 16px 0; border-bottom: 1px solid var(--rule); }
.thread-head { margin-bottom: 12px; }
.hn > section { margin-top: 30px; }
.prose { margin-inline: auto; padding-top: 40px; }
.preview-open { overflow: hidden; }
.paper-preview { position: fixed; inset: 0 0 0 auto; margin: 0; height: 100dvh; max-height: 100dvh; width: min(650px, 100vw); max-width: 100vw; padding: 0; border: 0; border-left: 1px solid var(--rule); color: var(--ink); background: var(--paper); box-shadow: -12px 0 80px #0003; }
.paper-preview::backdrop { background: #10181180; }
.preview-toolbar { position: sticky; top: 0; z-index: 1; display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 16px 28px; background: var(--paper); border-bottom: 1px solid var(--rule); }
.preview-toolbar .eyebrow { margin: 0; }
.preview-content { padding: 28px; }
.preview-title { font: 700 29px/1.2 var(--serif); margin: 0 0 16px; overflow-wrap: anywhere; }
.preview-authors { font: 16px/1.5 var(--serif); color: var(--meta); }
.preview-content h3 { margin: 32px 0 12px; font: 700 14px/1.4 var(--sans); }
.preview-abstract { font: 17px/1.6 var(--serif); overflow-wrap: anywhere; }
.preview-summary { line-height: 1.7; }
.preview-note { color: var(--meta); font-size: 11px; line-height: 1.6; }
.preview-quote { margin: 22px 0; padding: 0 0 0 18px; border-left: 2px solid var(--hn); }
.preview-quote p { color: var(--ink-2); line-height: 1.7; overflow-wrap: anywhere; }
.preview-thread { font-weight: 700; }
.preview-source { color: var(--meta); font-size: 11px; }
.preview-source:hover { color: var(--ink); }
@media (min-width: 1300px) { .tools { width: auto; flex: 1; } .search { max-width: 290px; } .top { gap: 14px 24px; } .nav { gap: 0 12px; } }
@media (min-width: 1100px) and (max-width: 1230px) { .stamp { position: static; writing-mode: horizontal-tb; transform: none; margin-bottom: 22px; } }
@media (max-width: 760px) {
  :root { --gutter: 18px; --fs-row: 20px; }
  .top { padding-top: 16px; gap: 8px 18px; }
  .top nav { order: 3; width: 100%; }
  .nav { justify-content: space-between; gap: 0 8px; font-size: 12px; }
  .tools { width: 100%; gap: 12px; }
  .hero { grid-template-columns: 1fr; gap: 25px; padding-top: 32px; }
  .hero h1 { font-size: 42px; }
  .hero-intro { max-width: 50ch; }
  .corpus svg { height: 90px; }
  .corpus .eyebrow { margin-bottom: 8px; }
  .hero-stats { margin: 0; }
  .filter-bar { padding: 12px; gap: 12px; }
  .filter-field { flex-basis: calc(50% - 12px); }
  .filter-field:first-child { flex-grow: 1; }
  .row { grid-template-columns: var(--rank-w, 2.2em) minmax(0,1fr); grid-template-areas: "rank main" "rank foot"; column-gap: 12px; row-gap: 9px; }
  .spark { width: 95px; margin-top: 0; }
  .counts { max-width: calc(100% - 104px); gap: 0 8px; }
  .counts b { font-size: 14px; }
  .counts span + span { margin-top: 0; }
  .stamp { white-space: normal; }
  .arxiv-meta div { display: block; margin-top: 8px; }
  .arxiv-meta dt { font-weight: 700; }
  .thread-meta, .story-meta { white-space: normal; }
  .preview-toolbar { padding: 12px 18px; }
  .preview-content { padding: 22px 18px; }
  .preview-title { font-size: 26px; }
}
@media (max-width: 360px) { .spark { display: none; } .counts { max-width: 100%; justify-self: start; } .hero h1 { font-size: 36px; } }
@media print {
  :root { color-scheme: light; --paper: #fff; --ink: #000; --ink-2: #333; --meta: #555; --rule: #ccc; }
  .filter-bar, .filter-summary, .hero-links, .paper-jumps, .paper-links, .skip-link, .paper-preview, .meta button { display: none !important; }
  .row { break-inside: avoid; }
}
/* Keep the first results close to the introduction, including laptop viewports. */
.hero { padding-top: 30px; padding-bottom: 18px; gap: 20px 48px; }
.hero h1 { font-size: clamp(33px, 3.7vw, 44px); margin-bottom: 14px; }
.hero .eyebrow { margin-bottom: 12px; }
.hero-intro { max-width: none; font-size: 13px; line-height: 1.65; }
.hero-links { margin-top: 14px; }
.hero-stats { padding-top: 12px; }
.view-head > p { max-width: none; }

/* Discovery and the private research workspace. */
.discovery-nav { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0 14px; }
.discovery-nav a { display: inline-flex; padding: 9px 13px; border: 1px solid var(--rule); border-radius: 4px; min-height: 38px; align-items: center; }
.discovery-nav a[aria-current="page"], .discovery-nav a.active { border-color: var(--hn); box-shadow: inset 0 -2px var(--hn); color: var(--ink); }
.radar-summary { border-left: 3px solid var(--hn); padding: 10px 15px; background: var(--field); color: var(--ink-2); line-height: 1.7; margin: 14px 0; }
.search-options { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 20px; margin: 16px 0; color: var(--ink-2); }
.search-options label { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; }
.search-options input { accent-color: var(--hn); width: 17px; height: 17px; }
.match-snippet { color: var(--meta); font: 14px/1.6 var(--serif); margin: 8px 0 0; max-width: 80ch; overflow-wrap: anywhere; }
.early-rank { color: var(--meta); font-size: 10px; line-height: 1.3; }
.submission-rank { color: var(--meta); font-size: 10px; line-height: 1.3; }
.search-options .search-scope { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 8px; max-width: 100%; }
.search-scope select { font: inherit; color: var(--ink); background: var(--field); border: 1px solid var(--rule); border-radius: 4px; padding: 8px 10px; min-height: 40px; max-width: 100%; }
.early-note, .discovery-note { padding: 12px 16px; border-left: 3px solid var(--hn); background: var(--field); margin: 18px 0; }
.library-edit { color: var(--meta); }
.library-badge, .library-status { font-size: 11px; color: var(--meta); }
.library-dialog { color: var(--ink); background: var(--paper); border: 1px solid var(--rule); border-radius: 8px; padding: 26px; width: min(600px, calc(100vw - 28px)); max-height: calc(100dvh - 32px); overflow: auto; }
.library-dialog::backdrop { background: var(--shade); }
.library-dialog-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; margin-bottom: 20px; }
.library-dialog h2 { font: 26px/1.2 var(--serif); margin: 0 0 8px; }
.library-dialog p { overflow-wrap: anywhere; }
.library-form { display: grid; gap: 18px; }
.library-field { display: flex; flex-direction: column; gap: 7px; }
.library-field input, .library-field select, .library-field textarea, .lookup-form input { border: 1px solid var(--rule); border-radius: 4px; color: var(--ink); background: var(--field); font: inherit; width: 100%; padding: 11px 12px; min-height: 42px; }
.library-field textarea { resize: vertical; min-height: 160px; line-height: 1.6; }
.library-tags-help, .library-note-count, .library-message { font-size: 12px; line-height: 1.6; color: var(--meta); margin: 0; }
.library-actions { display: flex; flex-wrap: wrap; gap: 10px; justify-content: flex-end; padding-top: 4px; }
.library-controls { display: flex; flex-wrap: wrap; gap: 12px; margin: 14px 0; }
.library-filters { display: flex; flex-wrap: wrap; gap: 12px; padding: 16px; margin: 16px 0; border: 1px solid var(--rule); border-radius: 4px; }
.library-filter-field { display: grid; gap: 6px; flex: 1; min-width: 135px; color: var(--meta); font-size: 11px; }
.library-filter-field input, .library-filter-field select { border: 1px solid var(--rule); border-radius: 4px; background: var(--field); color: var(--ink); font: inherit; font-size: 12px; padding: 10px; width: 100%; }
.library-scope { display: flex; align-items: center; gap: 8px; width: 100%; font-size: 12px; }
.library-scope input { accent-color: var(--hn); }
.library-result-status, .library-summary, .data-note, .data-status { font-size: 12px; color: var(--meta); line-height: 1.6; }
.library-summary { display: block; margin-top: 6px; }
.early-label { color: var(--meta); font-size: 11px; margin-right: 8px; }
.submission-label { display: inline-block; color: var(--meta); font-size: 11px; margin: 2px 8px 0 0; }
.lookup-paper-title { font: 22px/1.4 var(--serif); color: var(--ink); }
.coverage-page { max-width: 900px; margin: 0 auto; padding: 42px 0 20px; }
.coverage-page h1 { font: 38px/1.2 var(--serif); margin: 12px 0 18px; max-width: 24ch; }
.coverage-page h2 { font: 26px/1.25 var(--serif); margin: 0 0 12px; }
.coverage-page h3 { font: 20px/1.35 var(--serif); }
.coverage-page p { line-height: 1.75; max-width: 85ch; }
.coverage-page p a { text-decoration: underline; text-underline-offset: 3px; }
.coverage-intro { font: 21px/1.5 var(--serif); color: var(--ink-2); }
.coverage-page section { margin: 36px 0; }
.coverage-counts { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--rule); border-radius: 6px; overflow: hidden; margin: 26px 0; }
.coverage-count { display: flex; flex-direction: column-reverse; gap: 5px; padding: 22px; border-bottom: 1px solid var(--rule); }
.coverage-count:nth-child(n+4) { border-bottom: none; }
.coverage-count:not(:nth-child(3n)) { border-right: 1px solid var(--rule); }
.coverage-count dt { font-size: 11px; color: var(--meta); }
.coverage-count dd { font: 34px/1.2 var(--serif); margin: 0; }
.lookup-panel { background: var(--field); border: 1px solid var(--rule); border-radius: 6px; padding: 24px; }
.lookup-form label { display: block; margin: 16px 0 8px; font-size: 12px; }
.lookup-form > div { display: flex; gap: 10px; }
.lookup-form input { min-width: 0; }
.lookup-form button { flex-shrink: 0; }
.lookup-card { padding-top: 10px; margin-top: 20px; border-top: 1px solid var(--rule); }
.lookup-card a { text-decoration: underline; text-underline-offset: 3px; }
.table-scroll { overflow-x: auto; }
.coverage-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 12px; }
.coverage-table th, .coverage-table td { padding: 13px 16px 13px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.coverage-table thead { color: var(--meta); }
.feed-details summary { padding: 14px 0; cursor: pointer; }
.feed-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 24px; list-style: none; padding: 0; font-size: 12px; }
.feed-list li { padding: 8px 0; overflow-wrap: anywhere; }
.feed-list a:hover { text-decoration: underline; }
.discussion-controls { display: flex; align-items: end; flex-wrap: wrap; gap: 12px 20px; padding: 12px 0 18px; }
.discussion-controls label { display: grid; gap: 6px; font-size: 11px; color: var(--meta); }
.discussion-controls select { font: inherit; padding: 8px; background: var(--field); color: var(--ink); border: 1px solid var(--rule); border-radius: 4px; }
@media (max-width: 600px) {
  .nav { gap: 0 13px; }
  .coverage-page { padding-top: 28px; }
  .coverage-page h1 { font-size: 31px; }
  .coverage-counts { grid-template-columns: repeat(2, 1fr); }
  .coverage-count { padding: 17px; }
  .coverage-count:nth-child(n) { border-right: none; border-bottom: 1px solid var(--rule); }
  .coverage-count:nth-child(odd) { border-right: 1px solid var(--rule); }
  .coverage-count:nth-last-child(-n+2) { border-bottom: none; }
  .lookup-panel { padding: 18px; }
  .lookup-form > div { flex-direction: column; }
  .feed-list { grid-template-columns: 1fr; }
  .library-dialog { padding: 20px; }
  .discovery-nav { gap: 7px; }
  .discovery-nav a { padding: 8px 10px; font-size: 12px; }
}
.preview-abstract-wrap:has(.preview-full[open]) .preview-short { display: none; }
.preview-full summary { cursor: pointer; font-size: 12px; color: var(--meta); padding: 7px 0; }
.preview-full[open] summary { color: var(--ink); }
@media (max-width: 760px) { .hero h1 { font-size: 36px; } .hero { gap: 20px; } }
@media (min-width: 1050px) {
  .top { flex-wrap: nowrap; gap: 20px; }
  .tools { width: auto; flex: 1; min-width: 0; }
  .search { max-width: 290px; min-width: 0; }
  .nav { gap: 0 12px; }
}

/* A submission-only source has no comment timeline to chart. */
.hn-summary[data-mentions="0"] + .hist-wrap { display: none; }