/* Paper Feed — a weekly periodical for reading research. */

:root {
  --bg: #f5efe3;
  --bg-2: #ece4d3;
  --bg-3: #e1d7c2;
  --ink: #1b1813;
  --ink-2: #46403a;
  --muted: #7b7367;
  --rule: #d6cbb8;
  --accent: #1a56c9;
  --accent-2: #d2801d;
  --fig-1: #1a56c9;
  --fig-2: #e07a1a;
  --fig-3: #158f60;
  --fig-4: #c8367a;
  --fig-5: #7247d1;
  --fig-6: #8c7f14;
  --fig-ink: #1b1813;
  --fig-muted: #8a8172;
  --fig-bg: #f5efe3;
  --serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --display: "Fraunces", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --mono: "IBM Plex Mono", "SF Mono", Menlo, Consolas, monospace;
  --measure: 44rem;
  --shadow: 0 1px 0 rgba(40, 30, 10, .05), 0 14px 32px -20px rgba(40, 30, 10, .45);
  --grain-blend: multiply;
  --grain-opacity: .07;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #101a2c;
    --bg-2: #172439;
    --bg-3: #21324d;
    --ink: #e9e3d6;
    --ink-2: #c9c2b3;
    --muted: #8e97a8;
    --rule: #2b3b56;
    --accent: #7fb2ff;
    --accent-2: #f3c14f;
    --fig-1: #6ea6ff;
    --fig-2: #ff9a45;
    --fig-3: #45d391;
    --fig-4: #ff6fae;
    --fig-5: #b190ff;
    --fig-6: #e0d05a;
    --fig-ink: #e9e3d6;
    --fig-muted: #7f8ba0;
    --fig-bg: #101a2c;
    --shadow: 0 1px 0 rgba(0, 0, 0, .2), 0 16px 36px -20px rgba(0, 0, 0, .8);
    --grain-blend: screen;
    --grain-opacity: .05;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #101a2c;
  --bg-2: #172439;
  --bg-3: #21324d;
  --ink: #e9e3d6;
  --ink-2: #c9c2b3;
  --muted: #8e97a8;
  --rule: #2b3b56;
  --accent: #7fb2ff;
  --accent-2: #f3c14f;
  --fig-1: #6ea6ff;
  --fig-2: #ff9a45;
  --fig-3: #45d391;
  --fig-4: #ff6fae;
  --fig-5: #b190ff;
  --fig-6: #e0d05a;
  --fig-ink: #e9e3d6;
  --fig-muted: #7f8ba0;
  --fig-bg: #101a2c;
  --shadow: 0 1px 0 rgba(0, 0, 0, .2), 0 16px 36px -20px rgba(0, 0, 0, .8);
  --grain-blend: screen;
  --grain-opacity: .05;
  color-scheme: dark;
}

/* ---- base -------------------------------------------------------------- */

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background:
    radial-gradient(1100px 520px at 12% -8%, color-mix(in oklab, var(--accent) 9%, transparent), transparent 70%),
    var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.1875rem;
  line-height: 1.6;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: var(--grain-opacity);
  mix-blend-mode: var(--grain-blend);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.masthead, .page, .colophon { position: relative; z-index: 1; }

a { color: var(--accent); text-decoration: none; text-underline-offset: .18em; }
a:hover { text-decoration: underline; }
code, pre, kbd { font-family: var(--mono); }
code { font-size: .85em; }
b, strong { font-weight: 600; }

.page { max-width: 52rem; margin: 0 auto; padding: 2.2rem 1.25rem 5rem; }

/* ---- masthead ---------------------------------------------------------- */

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  max-width: 52rem;
  margin: 0 auto;
  padding: 1.4rem 1.25rem .9rem;
  border-bottom: 1px solid var(--rule);
}
.brand {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.4rem;
  letter-spacing: -.01em;
  color: var(--ink);
  font-variation-settings: "opsz" 48, "SOFT" 60, "WONK" 1;
}
.brand:hover { text-decoration: none; color: var(--accent); }
.brand-mark { color: var(--accent-2); margin-right: .4rem; font-style: italic; font-weight: 400; }
.nav {
  display: flex;
  gap: 1.1rem;
  align-items: center;
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.nav a { color: var(--ink-2); }
.nav a:hover { color: var(--accent); text-decoration: none; }
.theme-toggle {
  background: none;
  border: 1px solid var(--rule);
  color: var(--ink-2);
  border-radius: 999px;
  width: 2rem;
  height: 2rem;
  line-height: 1;
  cursor: pointer;
  font-size: 1rem;
  transition: transform .4s cubic-bezier(.2, .7, .2, 1), border-color .2s;
}
.theme-toggle:hover { border-color: var(--accent); transform: rotate(180deg); }
.push-toggle { font-size: .8rem; }
.push-toggle:hover { transform: none; }
.push-toggle:not(.is-on) { filter: grayscale(1); opacity: .55; }
.push-toggle.is-on { border-color: var(--accent-2); opacity: 1; filter: none; }

/* ---- type utilities ---------------------------------------------------- */

.eyebrow {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 .6rem;
}
.eyebrow a { color: var(--muted); }
.eyebrow .tag { vertical-align: middle; margin-left: .3rem; }
.display {
  font-family: var(--display);
  font-weight: 500;
  font-size: clamp(2.4rem, 6vw, 3.7rem);
  line-height: 1.02;
  letter-spacing: -.025em;
  margin: 0 0 1rem;
  font-variation-settings: "opsz" 144, "SOFT" 30;
}
.section-title {
  font-family: var(--display);
  font-weight: 500;
  font-size: 1.55rem;
  letter-spacing: -.01em;
  margin: 3.2rem 0 1rem;
}
.lede { font-size: 1.15rem; color: var(--ink-2); margin: 0; }
.tag {
  display: inline-block;
  padding: .16rem .5rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--bg-2);
  color: var(--ink-2);
  font-family: var(--mono);
  font-size: .66rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  line-height: 1.5;
  white-space: nowrap;
}
.tag-manual { border-color: var(--accent-2); color: var(--accent-2); }
.tag-kind { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.section-title-small { font-size: 1.15rem; margin-top: 2rem; }
.projects .picks { margin-top: 1.4rem; }
.tag-strong { border-color: var(--accent); color: var(--accent); }
.tag-picked { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.meta { font-family: var(--mono); font-size: .72rem; color: var(--muted); }
.sep { margin: 0 .35rem; color: var(--rule); }
.more { margin: 2.6rem 0 0; font-family: var(--mono); font-size: .8rem; }

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

.issue-hero { padding: .6rem 0 .4rem; }
.stats {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.4rem;
  font-family: var(--mono);
  font-size: .78rem;
  color: var(--muted);
  margin: 0 0 1.6rem;
}
.stats b { color: var(--ink); font-weight: 500; }
.editor-note {
  position: relative;
  padding: 1.1rem 1.4rem 1.1rem 2.7rem;
  background: var(--bg-2);
  border-radius: .7rem;
  font-size: 1.12rem;
  font-style: italic;
  box-shadow: var(--shadow);
}
.editor-note::before {
  content: "❧";
  position: absolute;
  left: 1rem;
  top: .75rem;
  color: var(--accent-2);
  font-size: 1.5rem;
  font-style: normal;
}
.editor-note p { margin: 0; }

/* ---- picks ------------------------------------------------------------- */

.picks { list-style: none; margin: 2.4rem 0 0; padding: 0; }
.pick {
  display: grid;
  grid-template-columns: 4.4rem 1fr;
  gap: 0 1rem;
  padding: 1.7rem 0;
  border-top: 1px solid var(--rule);
}
.pick:last-child { border-bottom: 1px solid var(--rule); }
.pick-num {
  font-family: var(--display);
  font-size: 2.8rem;
  font-weight: 300;
  line-height: 1;
  color: var(--accent-2);
  letter-spacing: -.05em;
  padding-top: .35rem;
  font-variation-settings: "opsz" 144, "SOFT" 100;
}
.pick-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  align-items: center;
  margin: 0 0 .55rem;
}
.pick-title {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.6rem;
  line-height: 1.18;
  letter-spacing: -.015em;
  margin: 0 0 .35rem;
  font-variation-settings: "opsz" 48, "SOFT" 20;
}
.pick-title a { color: var(--ink); }
.pick-title a:hover { color: var(--accent); text-decoration: none; }
.pick-authors { margin: 0 0 .75rem; color: var(--muted); font-size: .95rem; font-style: italic; }
.pick-reason { margin: 0 0 .5rem; }
.pick-lookfor { margin: 0 0 .7rem; font-size: 1.02rem; color: var(--ink-2); }
.lookfor-label {
  font-family: var(--mono);
  font-size: .66rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--accent);
  margin-right: .45rem;
}
.pick-foot { margin: 0; font-family: var(--mono); font-size: .74rem; color: var(--muted); }
.pending { font-style: italic; }
.read-mark { display: none; font-family: var(--mono); font-size: .68rem; color: var(--fig-3); letter-spacing: .06em; }
.is-read .read-mark { display: inline; }
.is-read .pick-title a { color: var(--muted); }
.is-read .pick-num { color: var(--rule); }

/* ---- mentions & archive ------------------------------------------------ */

.mention-list { list-style: none; margin: 0; padding: 0; }
.mention-list li { padding: .85rem 0; border-top: 1px dashed var(--rule); }
.mention-list li > a { color: var(--ink); font-weight: 500; }
.mention-list li > a:hover { color: var(--accent); }
.mention-list .tag { margin-left: .4rem; vertical-align: middle; }
.mention-list p { margin: .25rem 0 0; font-size: 1rem; color: var(--ink-2); }

.archive { margin-top: 4rem; }
.archive-issue { padding: 1.2rem 0; border-top: 1px solid var(--rule); }
.archive-issue header a { color: var(--ink); display: flex; gap: 1rem; align-items: baseline; }
.archive-issue header a:hover { text-decoration: none; color: var(--accent); }
.archive-issue .eyebrow { margin: 0; }
.archive-date { font-family: var(--display); font-size: 1.25rem; font-weight: 500; }
.archive-list { margin: .7rem 0 0; padding-left: 1.4rem; font-size: 1.02rem; }
.archive-list li { margin: .3rem 0; }
.archive-list a { color: var(--ink); }
.archive-list .tag { margin-left: .3rem; vertical-align: middle; }
.archive-list li.is-read a { color: var(--muted); }
.archive-list .read-mark { margin-left: .3rem; }

/* ---- candidates -------------------------------------------------------- */

.cands { list-style: none; margin: 2rem 0 0; padding: 0; }
.cand {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 0 1rem;
  padding: 1.1rem .6rem;
  margin: 0 -.6rem;
  border-top: 1px solid var(--rule);
  border-radius: .4rem;
}
.cand.is-picked { background: linear-gradient(90deg, var(--bg-2), transparent 80%); }
.cand-scores { display: flex; gap: 3px; align-items: flex-end; height: 2.4rem; padding-top: .3rem; }
.cand-scores .bar { position: relative; width: 6px; height: 100%; background: var(--bg-3); border-radius: 2px; overflow: hidden; }
.cand-scores .bar i { position: absolute; bottom: 0; left: 0; right: 0; background: var(--accent); border-radius: 2px; }
.cand-title { font-family: var(--display); font-size: 1.18rem; font-weight: 500; margin: 0 0 .2rem; line-height: 1.25; }
.cand-title a { color: var(--ink); }
.cand-summary { margin: .3rem 0; font-size: 1rem; }
.cand-why { margin: 0; font-size: .95rem; color: var(--muted); font-style: italic; }
.tag-maybe { color: var(--muted); }

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

.progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10;
  height: 3px;
  width: 100%;
  background: var(--accent);
  transform-origin: 0 50%;
  transform: scaleX(0);
}
@supports (animation-timeline: scroll()) {
  .progress { animation: grow linear both; animation-timeline: scroll(root); }
  @keyframes grow { from { transform: scaleX(0); } to { transform: scaleX(1); } }
}
.explainer { max-width: var(--measure); margin: 0 auto; }
.paper-head { padding: 1rem 0 2rem; border-bottom: 1px solid var(--rule); margin-bottom: 2.4rem; }
.paper-title {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(1.9rem, 4.6vw, 2.75rem);
  line-height: 1.1;
  letter-spacing: -.022em;
  margin: 0 0 .8rem;
  font-variation-settings: "opsz" 144, "SOFT" 30;
}
.paper-authors { color: var(--ink-2); font-size: 1rem; margin: 0 0 .5rem; }
.paper-links { font-family: var(--mono); font-size: .74rem; color: var(--muted); margin: 0 0 1.6rem; line-height: 1.9; }
.why { border-left: 3px solid var(--accent-2); padding: .15rem 0 .15rem 1.1rem; font-size: 1.06rem; }
.why p { margin: 0 0 .45rem; }
.why p:last-child { margin-bottom: 0; }
.why-label { font-family: var(--mono); font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--accent-2); }
.notice { font-family: var(--mono); font-size: .76rem; color: var(--accent-2); margin: 1rem 0 0; }

/* ---- prose (the explainer body) ---------------------------------------- */

.prose { font-size: 1.2rem; line-height: 1.62; }
.prose > p:first-child {
  font-family: var(--display);
  font-weight: 400;
  font-size: 1.36rem;
  line-height: 1.45;
  letter-spacing: -.005em;
  margin-bottom: 1.9rem;
  font-variation-settings: "opsz" 24, "SOFT" 40;
}
.prose h2 {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.72rem;
  line-height: 1.15;
  letter-spacing: -.015em;
  margin: 2.8rem 0 .9rem;
  font-variation-settings: "opsz" 72, "SOFT" 20;
}
.prose h2::before { content: "§ "; color: var(--accent-2); font-weight: 300; }
.prose h3 { font-family: var(--display); font-weight: 600; font-size: 1.28rem; margin: 2.1rem 0 .6rem; }
.prose p { margin: 0 0 1.2rem; }
.prose blockquote {
  margin: 1.6rem 0;
  padding: .2rem 0 .2rem 1.2rem;
  border-left: 3px solid var(--rule);
  color: var(--ink-2);
  font-style: italic;
}
.prose ul, .prose ol { padding-left: 1.5rem; margin: 0 0 1.2rem; }
.prose li { margin: .3rem 0; }
.prose li p { margin: 0; }
.prose code { background: var(--bg-2); padding: .1em .35em; border-radius: .3em; }
.prose pre {
  background: var(--bg-2);
  padding: 1rem 1.2rem;
  border-radius: .5rem;
  overflow-x: auto;
  font-size: .84rem;
  line-height: 1.55;
}
.prose pre code { background: none; padding: 0; font-size: inherit; }
.prose table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.6rem 0;
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}
.prose th, .prose td { padding: .5rem .7rem; border-bottom: 1px solid var(--rule); text-align: left; vertical-align: top; }
.prose th {
  font-family: var(--mono);
  font-size: .7rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
  font-weight: 500;
  border-bottom: 2px solid var(--ink);
}
.prose figure {
  margin: 2.2rem -1rem;
  padding: 1.2rem 1rem 1rem;
  background: var(--bg-2);
  border-radius: .8rem;
  box-shadow: var(--shadow);
}
.prose figure svg { display: block; width: 100%; height: auto; font-family: var(--serif); }
.prose figure.chart svg { font-family: var(--mono); }
.prose figcaption { margin-top: .8rem; font-size: .95rem; color: var(--ink-2); font-style: italic; text-align: center; }
.prose .math.block { overflow-x: auto; margin: 1.4rem 0; text-align: center; }
.prose .mermaid { background: none; text-align: center; }
.prose .chart-error { color: var(--fig-4); white-space: pre-wrap; }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 2.4rem 0; }
.prose img { max-width: 100%; }
.prose a { text-decoration: underline; text-decoration-color: color-mix(in oklab, var(--accent) 40%, transparent); }

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

.paper-foot { margin-top: 3rem; padding-top: 1.6rem; border-top: 1px solid var(--rule); }
.read-toggle {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--bg);
  border: 0;
  padding: .65rem 1.1rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background .2s;
}
.read-toggle.is-read { background: var(--fig-3); }
.abstract { margin: 1.6rem 0; font-size: 1rem; color: var(--ink-2); }
.abstract summary {
  cursor: pointer;
  font-family: var(--mono);
  font-size: .74rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
}
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 2rem 0; }
.pager a {
  display: block;
  padding: 1rem 1.1rem;
  border: 1px solid var(--rule);
  border-radius: .7rem;
  color: var(--ink);
  font-family: var(--display);
  font-size: 1.05rem;
  line-height: 1.3;
  transition: border-color .2s, transform .3s cubic-bezier(.2, .7, .2, 1);
}
.pager a:hover { border-color: var(--accent); text-decoration: none; transform: translateY(-2px); }
.pager .next { text-align: right; }
.pager .eyebrow { display: block; margin-bottom: .3rem; }
.gen-meta { font-family: var(--mono); font-size: .7rem; color: var(--muted); line-height: 1.7; }

/* ---- motion ------------------------------------------------------------ */

@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.reveal { animation: rise .7s cubic-bezier(.2, .7, .2, 1) both; animation-delay: calc(var(--i, 0) * 70ms); }
@media (prefers-reduced-motion: reduce) {
  .reveal, .progress { animation: none; }
  .theme-toggle, .pager a { transition: none; }
}

/* ---- colophon & responsive -------------------------------------------- */

.colophon {
  max-width: 52rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: .7rem;
  color: var(--muted);
  line-height: 1.8;
}
@media (max-width: 640px) {
  body { font-size: 1.1rem; }
  .masthead { flex-direction: column; align-items: flex-start; gap: .7rem; }
  .pick { grid-template-columns: 2.7rem 1fr; }
  .pick-num { font-size: 1.9rem; }
  .prose { font-size: 1.12rem; }
  .prose figure { margin: 1.8rem -.6rem; padding: .9rem .6rem .8rem; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { text-align: left; }
  .cand { grid-template-columns: 2.2rem 1fr; }
}