/* Paper Notes: an independent visual system, scoped away from the main site. */
:root {
  --pn-bg: #191a1d;
  --pn-paper: #f1f1f3;
  --pn-muted: #aaadb5;
  --pn-line: #3a3c42;
  --pn-accent: #dadde5;
  --pn-mono:
    ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 35px;
}
body.pn-site {
  margin: 0;
  background: var(--pn-bg);
  color: var(--pn-paper);
  font-family:
    Arial, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
body.pn-site::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background: radial-gradient(ellipse at 85% 5%, #4a4d5555, transparent 45%);
}
.pn-site a {
  color: inherit;
  text-decoration: none;
}
.pn-site button,
.pn-site input {
  font: inherit;
}
.pn-site button {
  cursor: pointer;
}
.pn-site ::selection {
  background: var(--pn-accent);
  color: var(--pn-bg);
}
.pn-site :focus-visible {
  outline: 2px solid var(--pn-accent);
  outline-offset: 6px;
}
.pn-site [hidden] {
  display: none !important;
}
.pn-shell {
  max-width: 1440px;
  margin: auto;
  padding-inline: clamp(22px, 5vw, 80px);
}
.pn-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.pn-skip {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 20;
  background: var(--pn-accent);
  color: #191a1d !important;
  padding: 15px;
}
.pn-skip:focus {
  top: 16px;
}
.pn-nav {
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 25px;
  font: 11px var(--pn-mono);
  letter-spacing: 0.04em;
}
.pn-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}
.pn-brand-mark {
  font: 32px Arial;
  color: var(--pn-accent);
  margin-right: 9px;
}
.pn-brand-slash {
  color: #747780;
}
.pn-nav nav {
  display: flex;
  gap: 34px;
}
.pn-nav nav a {
  padding: 12px 0;
}
.pn-nav nav span {
  color: var(--pn-accent);
  margin-left: 10px;
}
.pn-nav a:hover {
  color: var(--pn-accent);
}
.pn-hero {
  display: grid;
  grid-template-columns: 1.12fr 1fr;
  gap: 20px;
  position: relative;
  padding: 40px 0 55px;
}
.pn-eyebrow {
  font: 10px/1.6 var(--pn-mono);
  letter-spacing: 0.09em;
  color: var(--pn-muted);
  margin: 0;
}
.pn-hero-copy {
  min-width: 0;
}
.pn-status-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--pn-accent);
  margin-right: 8px;
  box-shadow: 0 0 12px #dadde566;
}
.pn-hero h1 {
  font-size: clamp(88px, 11.5vw, 166px);
  line-height: 0.81;
  letter-spacing: -0.075em;
  margin: 42px 0 30px;
  font-weight: 800;
  position: relative;
  z-index: 1;
}
.pn-hero h1 > span {
  color: var(--pn-accent);
}
.pn-hero sup {
  font: 28px var(--pn-mono);
  vertical-align: top;
  display: inline-block;
  margin: 8px 0 0 16px;
  color: var(--pn-accent);
}
.pn-intro {
  font-size: clamp(18px, 2vw, 27px);
  line-height: 1.35;
  letter-spacing: -0.04em;
}
.pn-intro em {
  font-family: Georgia, serif;
  font-weight: 400;
  color: var(--pn-muted);
}
.pn-hero-bottom {
  display: flex;
  align-items: end;
  justify-content: space-between;
  max-width: 490px;
  margin-top: 38px;
  gap: 20px;
}
.pn-hero-bottom p {
  font-size: 12px;
  line-height: 1.9;
  color: var(--pn-muted);
  margin: 0;
}
.pn-round-link {
  height: 54px;
  width: 54px;
  border: 1px solid #646872;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 28px;
  transition:
    background 0.2s,
    color 0.2s,
    transform 0.2s;
}
.pn-round-link:hover {
  background: var(--pn-accent);
  color: var(--pn-bg);
  transform: rotate(45deg);
}
.pn-observatory {
  min-width: 0;
  position: relative;
  align-self: stretch;
  min-height: 500px;
  background: radial-gradient(ellipse at center, #c2c6cf0e, transparent 66%);
  overflow: hidden;
}
.pn-observatory::before,
.pn-observatory::after {
  content: "";
  position: absolute;
  pointer-events: none;
}
.pn-observatory::before {
  inset: 20px 5px 35px;
  background-image:
    linear-gradient(#c0c4ce0a 1px, transparent 1px),
    linear-gradient(90deg, #c0c4ce0a 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(ellipse, #000, transparent 70%);
}
.pn-observatory::after {
  width: 80%;
  height: 80%;
  border: 1px solid #9a9fac2b;
  border-radius: 50%;
  left: 10%;
  top: 10%;
  transform: rotate(-25deg) scaleY(0.48);
}
#pn-orbit {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.pn-orbit-label {
  position: absolute;
  top: 9px;
  left: 28px;
  font: 9px var(--pn-mono);
  letter-spacing: 0.08em;
  color: #a9adb8;
}
.pn-orbit-cross {
  position: absolute;
  font: 22px var(--pn-mono);
  color: #8f95a3;
}
.pn-orbit-cross--a {
  top: 16%;
  right: 8%;
}
.pn-orbit-cross--b {
  bottom: 15%;
  left: 8%;
}
.pn-orbit-tag {
  position: absolute;
  font: 9px var(--pn-mono);
  letter-spacing: 0.1em;
  padding: 7px 9px;
  color: var(--pn-accent);
  border: 1px solid #858b9955;
  background: #22242acc;
}
.pn-orbit-tag--a {
  top: 25%;
  left: 2%;
}
.pn-orbit-tag--b {
  top: 51%;
  right: 0;
}
.pn-orbit-tag--c {
  bottom: 15%;
  left: 31%;
}
.pn-orbit-caption {
  position: absolute;
  bottom: 0;
  inset-inline: 28px;
  display: flex;
  justify-content: space-between;
  font: 8px var(--pn-mono);
  letter-spacing: 0.06em;
  color: var(--pn-muted);
}
.pn-orbit-caption span:last-child {
  font-size: 20px;
  color: var(--pn-accent);
}
.pn-index-strip {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  border-block: 1px solid var(--pn-line);
  padding: 22px 0;
  font: 10px var(--pn-mono);
  letter-spacing: 0.06em;
  color: var(--pn-muted);
}
.pn-index-strip b {
  font-size: 18px;
  color: var(--pn-paper);
  margin-right: 10px;
}
.pn-feature {
  margin: 68px 0 100px;
  display: grid;
  grid-template-columns: 1fr 2.1fr;
  border: 1px solid var(--pn-line);
}
.pn-feature-label {
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 30px;
  background: #24262b;
  border-right: 1px solid var(--pn-line);
}
.pn-feature-star {
  font-size: 105px;
  line-height: 1;
  color: var(--pn-accent);
  align-self: center;
}
.pn-small {
  font: 12px/1.5 var(--pn-mono);
  color: var(--pn-muted);
}
.pn-feature-link {
  padding: 36px 42px;
  position: relative;
  transition: background 0.25s;
}
.pn-feature-link:hover {
  background: #2c2f35;
}
.pn-card-meta {
  display: flex;
  justify-content: space-between;
  gap: 15px;
  font: 10px/1.5 var(--pn-mono);
  color: var(--pn-muted);
}
.pn-card-meta span {
  color: var(--pn-accent);
}
.pn-feature h2 {
  font-size: clamp(24px, 2.7vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.045em;
  font-weight: 500;
  margin: 24px 0 18px;
  max-width: 740px;
}
.pn-feature p {
  font-size: 13px;
  line-height: 1.9;
  color: var(--pn-muted);
  max-width: 630px;
}
.pn-text-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font: 10px var(--pn-mono);
  letter-spacing: 0.05em;
  margin-top: 35px;
  color: var(--pn-accent);
}
.pn-text-link span {
  font-size: 25px;
  transition: transform 0.2s;
}
.pn-feature-link:hover .pn-text-link span {
  transform: translate(4px, -4px);
}
.pn-archive {
  scroll-margin-top: 30px;
}
.pn-section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 25px;
  margin-bottom: 35px;
}
.pn-section-heading h2 {
  font-size: clamp(32px, 4.5vw, 61px);
  font-weight: 500;
  letter-spacing: -0.055em;
  margin: 14px 0 0;
  line-height: 1.05;
}
.pn-section-heading h2 span {
  color: var(--pn-accent);
}
.pn-section-heading > p {
  font: 11px/1.8 var(--pn-mono);
  color: var(--pn-muted);
  margin: 0;
}
.pn-controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 22px 0;
  border-top: 1px solid var(--pn-line);
  margin-bottom: 15px;
}
.pn-filters {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
}
.pn-filters button {
  border: 1px solid transparent;
  background: transparent;
  color: var(--pn-muted);
  padding: 10px 13px;
  border-radius: 30px;
  font: 11px var(--pn-mono);
  transition:
    color 0.2s,
    border-color 0.2s;
}
.pn-filters button span {
  font-size: 9px;
  opacity: 0.7;
  margin-left: 3px;
}
.pn-filters button[aria-pressed="true"] {
  background: var(--pn-accent);
  color: var(--pn-bg);
}
.pn-filters button:hover {
  border-color: #787f8e;
  color: var(--pn-paper);
}
.pn-filters button[aria-pressed="true"]:hover {
  color: var(--pn-bg);
}
.pn-search {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid #656975;
  padding: 8px 0;
  width: 220px;
}
.pn-search > span:not(.pn-sr-only) {
  font-size: 24px;
  color: var(--pn-muted);
}
.pn-search input {
  background: transparent;
  border: 0;
  color: var(--pn-paper);
  min-width: 0;
  width: 100%;
  font: 11px var(--pn-mono);
  padding: 4px;
}
.pn-search input::placeholder {
  color: var(--pn-muted);
}
.pn-search kbd {
  font: 10px var(--pn-mono);
  padding: 3px 6px;
  border: 1px solid var(--pn-line);
  color: var(--pn-muted);
}
.pn-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}
.pn-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--pn-line);
  overflow: hidden;
  position: relative;
  transition:
    border-color 0.25s,
    transform 0.25s,
    box-shadow 0.25s;
  isolation: isolate;
}
.pn-card:hover {
  border-color: #8b93a4;
  transform: translateY(-5px);
  box-shadow: 0 15px 40px #0003;
}
.pn-card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(
    350px circle at var(--mx, 50%) var(--my, 0%),
    #dadde508,
    transparent 80%
  );
  opacity: 0;
  transition: opacity 0.25s;
}
.pn-card:hover::after {
  opacity: 1;
}
.pn-card-art {
  height: 210px;
  position: relative;
  overflow: hidden;
  background-color: #292c31;
  color: #bec4d0;
  border-bottom: 1px solid var(--pn-line);
  background-image:
    linear-gradient(#bec4d00a 1px, transparent 1px),
    linear-gradient(90deg, #bec4d00a 1px, transparent 1px);
  background-size: 26px 26px;
}
.pn-card-art--audio {
  background-color: #2e2c2b;
  color: #cbc3bc;
}
.pn-card-art--multiview {
  background-color: #282d2f;
  color: #bdc7ca;
}
.pn-card-art--timeline {
  background-color: #2d2c2b;
  color: #c9c5be;
}
.pn-card-art--rl {
  background-color: #2c2f35;
  color: #dadde5;
}
.pn-card-art--agents {
  background-color: #272b34;
  color: #bcc4d4;
  background-image:
    linear-gradient(#bcc4d409 1px, transparent 1px),
    linear-gradient(90deg, #bcc4d409 1px, transparent 1px);
}
.pn-card-art svg {
  width: 100%;
  height: 100%;
  transition: transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1);
  opacity: 0.85;
}
.pn-card:hover svg {
  transform: scale(1.08) rotate(-2deg);
}
.pn-art-label {
  position: absolute;
  top: 20px;
  left: 22px;
  font: 8px var(--pn-mono);
  letter-spacing: 0.1em;
}
.pn-art-number {
  position: absolute;
  bottom: 15px;
  left: 22px;
  font: 10px var(--pn-mono);
  opacity: 0.7;
}
.pn-card-arrow {
  position: absolute;
  right: 17px;
  top: 15px;
  width: 32px;
  height: 32px;
  border: 1px solid currentColor;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 20px;
  opacity: 0.6;
  transition:
    opacity 0.2s,
    background 0.2s;
}
.pn-card:hover .pn-card-arrow {
  opacity: 1;
  background: #dadde512;
}
.pn-card-copy {
  padding: 25px 27px 28px;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.pn-card h3 {
  font-size: clamp(20px, 1.9vw, 27px);
  line-height: 1.23;
  letter-spacing: -0.03em;
  font-weight: 500;
  margin: 18px 0 13px;
}
.pn-card-copy > p {
  font-size: 12px;
  line-height: 1.9;
  color: var(--pn-muted);
  margin: 0 0 24px;
}
.pn-tags {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  margin-top: auto;
}
.pn-tags span {
  font: 9px/1.4 var(--pn-mono);
  color: #b8bdc8;
  border: 1px solid #444851;
  padding: 5px 7px;
  overflow-wrap: anywhere;
}
.pn-empty {
  padding: 60px 20px;
  text-align: center;
  border: 1px solid var(--pn-line);
  color: var(--pn-muted);
}
.pn-empty p:first-child {
  font-size: 28px;
  color: var(--pn-paper);
}
.pn-empty button {
  background: var(--pn-accent);
  border: 0;
  padding: 14px 20px;
  font: 11px var(--pn-mono);
  margin-top: 15px;
  color: var(--pn-bg);
}
/* A chronological archive; topic filters preserve its reading-date order. */
.pn-archive-tools {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
  margin: 4px 0 17px;
}
.pn-month-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}
.pn-month-nav a {
  padding: 8px 10px;
  border: 1px solid var(--pn-line);
  font: 11px var(--pn-mono);
  color: var(--pn-muted);
}
.pn-month-nav a span {
  margin-left: 7px;
  color: var(--pn-paper);
  font-size: 9px;
}
.pn-month-nav a:hover {
  border-color: #8b93a4;
  color: var(--pn-paper);
}
.pn-view-switch {
  display: inline-flex;
  padding: 3px;
  border: 1px solid var(--pn-line);
  border-radius: 6px;
}
.pn-view-switch button {
  border: 0;
  border-radius: 3px;
  background: transparent;
  color: var(--pn-muted);
  font:
    11px/1.4 Arial,
    "PingFang SC",
    sans-serif;
  padding: 7px 13px;
}
.pn-view-switch button[aria-pressed="true"] {
  background: #3c4049;
  color: var(--pn-paper);
}
.pn-results {
  color: var(--pn-muted);
  font:
    11px/1.8 Arial,
    "PingFang SC",
    sans-serif;
  margin: 0 0 35px;
}
.pn-month-group {
  scroll-margin-top: 30px;
  margin-bottom: 48px;
}
.pn-month-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  border-bottom: 1px solid var(--pn-line);
  padding-bottom: 15px;
  margin-bottom: 12px;
}
.pn-month-heading h3 {
  margin: 0;
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.02em;
}
.pn-month-count {
  color: var(--pn-muted);
  font: 11px var(--pn-mono);
}
.pn-archive[data-view="timeline"] .pn-grid {
  display: block;
}
.pn-archive[data-view="timeline"] .pn-card {
  display: block;
  border: 0;
  border-bottom: 1px solid var(--pn-line);
  overflow: visible;
}
.pn-archive[data-view="timeline"] .pn-card:hover {
  transform: none;
  box-shadow: none;
  background: #ffffff03;
}
.pn-archive[data-view="timeline"] .pn-card-art {
  display: none;
}
.pn-archive[data-view="timeline"] .pn-card-copy {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr) auto;
  gap: 11px 22px;
  padding: 23px 6px;
}
.pn-archive[data-view="timeline"] .pn-card-meta {
  display: contents;
}
.pn-archive[data-view="timeline"] .pn-card-meta time {
  grid-column: 1;
  grid-row: 1;
  padding-top: 5px;
  font: 10px/1.5 var(--pn-mono);
  color: var(--pn-muted);
}
.pn-archive[data-view="timeline"] .pn-card-meta > span {
  grid-column: 3;
  grid-row: 1;
  padding-top: 5px;
  text-align: right;
  font: 10px/1.5 var(--pn-mono);
  color: var(--pn-muted);
}
.pn-archive[data-view="timeline"] .pn-card h3 {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-size: 20px;
  line-height: 1.4;
}
.pn-archive[data-view="timeline"] .pn-card-copy > p {
  grid-column: 2 / 4;
  grid-row: 2;
  margin: 0;
}
.pn-archive[data-view="timeline"] .pn-tags {
  grid-column: 2 / 4;
  grid-row: 3;
  margin: 0;
}
.pn-archive[data-view="cards"] .pn-month-heading {
  margin-bottom: 24px;
}
@media (max-width: 700px) {
  .pn-archive-tools {
    align-items: flex-start;
  }
  .pn-month-nav {
    gap: 6px;
  }
  .pn-month-nav a {
    font-size: 10px;
    padding: 8px;
  }
  .pn-results {
    margin-bottom: 27px;
    font-size: 10px;
  }
  .pn-month-group {
    margin-bottom: 35px;
  }
  .pn-month-heading h3 {
    font-size: 18px;
  }
  .pn-archive[data-view="timeline"] .pn-card-copy {
    grid-template-columns: 67px minmax(0, 1fr);
    gap: 10px 13px;
    padding: 20px 0;
  }
  .pn-archive[data-view="timeline"] .pn-card-meta time {
    font-size: 8px;
    padding-top: 5px;
  }
  .pn-archive[data-view="timeline"] .pn-card h3 {
    font-size: 16px;
    line-height: 1.45;
  }
  .pn-archive[data-view="timeline"] .pn-card-copy > p {
    grid-column: 2;
    font-size: 11px;
  }
  .pn-archive[data-view="timeline"] .pn-tags {
    grid-column: 2;
  }
  .pn-archive[data-view="timeline"] .pn-card-meta > span {
    grid-column: 2;
    grid-row: 4;
    text-align: left;
    padding-top: 0;
    font-size: 9px;
  }
}

.pn-footer {
  border-top: 1px solid var(--pn-line);
  margin-top: 95px;
  padding: 30px 0 38px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  font: 9px/1.5 var(--pn-mono);
  color: var(--pn-muted);
}
.pn-footer > a:first-child {
  color: var(--pn-paper);
}
.pn-footer a:hover {
  color: var(--pn-accent);
}
.pn-footer span {
  margin-inline: 7px;
  color: var(--pn-muted);
}
.pn-footer p {
  margin: 0;
}
/* Reading view */
.pn-reading-progress {
  position: fixed;
  inset: 0 0 auto;
  height: 3px;
  z-index: 30;
}
.pn-reading-progress span {
  display: block;
  background: var(--pn-accent);
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left;
}
.pn-article-header {
  max-width: 1100px;
  padding: 40px 0 45px;
  border-bottom: 1px solid var(--pn-line);
}
.pn-back {
  font: 10px var(--pn-mono);
  color: var(--pn-muted) !important;
}
.pn-back:hover {
  color: var(--pn-accent) !important;
}
.pn-article-kicker {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 65px;
  font: 11px var(--pn-mono);
  color: var(--pn-muted);
}
.pn-article-header h1 {
  font-size: clamp(32px, 4.6vw, 66px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.045em;
  margin: 22px 0 32px;
  overflow-wrap: anywhere;
}
.pn-article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  font: 11px var(--pn-mono);
}
.pn-article-meta > span {
  color: var(--pn-accent);
}
.pn-article-meta .pn-tags {
  margin: 0;
}
.pn-pdf {
  color: var(--pn-accent) !important;
  border-bottom: 1px solid #858e9f;
  padding: 8px 0;
}
.pn-reading-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 780px);
  gap: 65px;
  align-items: start;
  margin-top: 55px;
}
.pn-toc {
  position: sticky;
  top: 35px;
}
.pn-toc summary {
  font: 10px var(--pn-mono);
  letter-spacing: 0.06em;
  color: var(--pn-accent);
  list-style: none;
  display: flex;
  justify-content: space-between;
  cursor: pointer;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--pn-line);
}
.pn-toc summary::-webkit-details-marker {
  display: none;
}
.pn-toc nav {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding-top: 15px;
}
.pn-toc nav a {
  font-size: 11px;
  line-height: 1.7;
  color: var(--pn-muted);
  padding: 5px 0 5px 12px;
  border-left: 1px solid var(--pn-line);
}
.pn-toc nav a[data-depth="3"] {
  padding-left: 22px;
  font-size: 10px;
}
.pn-toc nav a:hover,
.pn-toc nav a[aria-current="true"] {
  color: var(--pn-accent);
  border-left-color: var(--pn-accent);
}
.pn-toc > p {
  font:
    10px/1.7 Georgia,
    serif;
  font-style: italic;
  color: var(--pn-muted);
  margin-top: 30px;
}
.pn-prose {
  font-size: 15px;
  line-height: 1.95;
  color: #c9cbd2;
  min-width: 0;
  grid-column: 2;
}
.pn-prose > :first-child {
  margin-top: 0;
}
.pn-prose h2,
.pn-prose h3 {
  color: var(--pn-paper);
  line-height: 1.5;
  scroll-margin-top: 30px;
}
.pn-prose h2 {
  font-size: 25px;
  font-weight: 500;
  margin: 55px 0 20px;
  letter-spacing: -0.025em;
  border-top: 1px solid var(--pn-line);
  padding-top: 28px;
}
.pn-prose h3 {
  font-size: 18px;
  font-weight: 500;
  margin: 30px 0 15px;
}
.pn-prose p {
  margin: 0 0 22px;
}
.pn-prose strong {
  color: var(--pn-paper);
}
.pn-prose a {
  color: var(--pn-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
  overflow-wrap: anywhere;
}
.pn-prose li {
  margin: 7px 0;
}
.pn-prose ul,
.pn-prose ol {
  padding-left: 25px;
  margin-bottom: 25px;
}
.pn-prose hr {
  border: 0;
  border-top: 1px solid var(--pn-line);
  margin: 35px 0;
}
.pn-prose blockquote {
  margin: 30px 0;
  border-left: 2px solid var(--pn-accent);
  padding: 12px 22px;
  background: #dadde505;
}
.pn-prose blockquote p:last-child {
  margin: 0;
}
.pn-prose pre {
  background: #23252a;
  padding: 22px;
  overflow: auto;
  border: 1px solid var(--pn-line);
  font-size: 12px;
  line-height: 1.7;
}
.pn-prose code {
  font-family: var(--pn-mono);
  font-size: 0.85em;
  background: #dadde50b;
  padding: 2px 4px;
  overflow-wrap: anywhere;
}
.pn-prose pre code {
  padding: 0;
  background: none;
  overflow-wrap: normal;
}
.pn-prose img,
.pn-prose video {
  max-width: 100%;
  height: auto;
}
.pn-prose table {
  display: block;
  max-width: 100%;
  overflow: auto;
  border-collapse: collapse;
  font-size: 13px;
  margin: 30px 0;
}
.pn-prose th,
.pn-prose td {
  border: 1px solid var(--pn-line);
  padding: 12px 16px;
  min-width: 100px;
}
.pn-prose th {
  color: var(--pn-accent);
  background: #262930;
}
.pn-prose .MathJax_Display {
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 10px 0;
}
.pn-prose .MathJax {
  color: var(--pn-paper);
}
.pn-adjacent {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 30px;
  margin-top: 70px;
  border-top: 1px solid var(--pn-line);
  padding-top: 30px;
}
.pn-adjacent a {
  padding: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 15px;
}
.pn-adjacent span {
  font: 10px var(--pn-mono);
  color: var(--pn-accent);
}
.pn-adjacent strong {
  font-weight: 400;
  max-width: 470px;
  font-size: 18px;
  line-height: 1.4;
}
.pn-adjacent a:hover strong {
  color: var(--pn-accent);
}
@media (min-width: 1440px) {
  .pn-hero h1 {
    font-size: 166px;
  }
}
@media (max-width: 1000px) {
  .pn-hero {
    grid-template-columns: 1.1fr 1fr;
    gap: 0;
  }
  .pn-hero h1 {
    font-size: 12vw;
  }
  .pn-hero sup {
    font-size: 18px;
    margin-left: 8px;
  }
  .pn-observatory {
    min-height: 470px;
  }
  .pn-reading-layout {
    grid-template-columns: 175px minmax(0, 1fr);
    gap: 35px;
  }
  .pn-card-copy {
    padding: 22px;
  }
  .pn-feature-link {
    padding: 30px;
  }
  .pn-feature-label {
    padding: 25px;
  }
  .pn-nav nav {
    gap: 20px;
  }
  .pn-footer p {
    max-width: 180px;
    text-align: center;
  }
}
@media (max-width: 700px) {
  .pn-nav {
    height: 80px;
    font-size: 9px;
    gap: 15px;
  }
  .pn-brand {
    gap: 6px;
  }
  .pn-brand-mark {
    font-size: 26px;
    margin-right: 2px;
  }
  .pn-nav nav {
    gap: 16px;
  }
  .pn-nav nav a:first-child {
    display: none;
  }
  .pn-nav nav span {
    margin-left: 3px;
  }
  .pn-hero {
    grid-template-columns: minmax(0, 1fr);
    padding: 25px 0 30px;
  }
  .pn-eyebrow {
    font-size: 8px;
  }
  .pn-hero h1 {
    font-size: clamp(80px, 24vw, 154px);
    margin-top: 34px;
  }
  .pn-hero sup {
    font-size: 22px;
  }
  .pn-intro {
    font-size: 23px;
    max-width: 320px;
  }
  .pn-hero-bottom {
    margin-top: 28px;
    max-width: none;
  }
  .pn-observatory {
    min-height: 345px;
    max-width: 430px;
    width: 100%;
    justify-self: center;
    margin-top: 35px;
  }
  .pn-orbit-label {
    left: 0;
  }
  .pn-orbit-caption {
    inset-inline: 0;
    font-size: 7px;
  }
  .pn-orbit-tag {
    font-size: 8px;
  }
  .pn-index-strip {
    font-size: 8px;
    flex-wrap: wrap;
    padding: 18px 0;
    gap: 15px;
  }
  .pn-index-strip > span:nth-child(2) {
    display: none;
  }
  .pn-index-strip b {
    font-size: 15px;
    margin-right: 5px;
  }
  .pn-feature {
    grid-template-columns: 1fr;
    margin: 40px 0 65px;
  }
  .pn-feature-label {
    flex-direction: row;
    align-items: center;
    padding: 18px 22px;
    border-right: 0;
    border-bottom: 1px solid var(--pn-line);
  }
  .pn-feature-star {
    font-size: 30px;
  }
  .pn-feature-label .pn-small {
    display: none;
  }
  .pn-feature-link {
    padding: 25px 22px;
  }
  .pn-feature h2 {
    font-size: 28px;
  }
  .pn-section-heading {
    align-items: start;
  }
  .pn-section-heading h2 {
    font-size: 36px;
    max-width: 240px;
  }
  .pn-section-heading > p {
    display: none;
  }
  .pn-controls {
    align-items: stretch;
    flex-direction: column;
    gap: 18px;
  }
  .pn-filters {
    gap: 3px;
  }
  .pn-filters button {
    font-size: 10px;
    padding: 10px 11px;
  }
  .pn-search {
    width: 100%;
  }
  .pn-grid {
    grid-template-columns: 1fr;
    gap: 22px;
  }
  .pn-card-art {
    height: 190px;
  }
  .pn-card h3 {
    font-size: 24px;
  }
  .pn-footer {
    margin-top: 60px;
    flex-wrap: wrap;
    padding: 25px 0;
    font-size: 8px;
  }
  .pn-footer p {
    order: 3;
    max-width: none;
    flex-basis: 100%;
    text-align: left;
    margin-top: 5px;
  }
  .pn-article-header {
    padding: 25px 0 32px;
  }
  .pn-article-kicker {
    margin-top: 45px;
    font-size: 10px;
  }
  .pn-article-header h1 {
    font-size: 35px;
    line-height: 1.15;
    margin-top: 18px;
  }
  .pn-article-meta {
    gap: 15px;
  }
  .pn-reading-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
    margin-top: 30px;
  }
  .pn-toc {
    position: static;
    max-width: none;
    padding: 20px;
    border: 1px solid var(--pn-line);
  }
  .pn-toc > p {
    display: none;
  }
  .pn-toc nav {
    gap: 0;
  }
  .pn-prose {
    grid-column: 1;
    font-size: 15px;
    line-height: 1.95;
  }
  .pn-prose h2 {
    font-size: 23px;
    margin-top: 40px;
  }
  .pn-adjacent {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .pn-adjacent strong {
    font-size: 17px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .pn-site *,
  .pn-site *::before,
  .pn-site *::after {
    animation: none !important;
    transition: none !important;
  }
}