:root {
  color-scheme: light;
  --canvas: #e5eaee;
  --surface: #f7f9fa;
  --raised: #ffffff;
  --ink: #13191e;
  --muted: #5d6973;
  --faint: #818c95;
  --line: #cfd7dd;
  --line-strong: #aebbc4;
  --accent: #315f7d;
  --accent-soft: #e5eff4;
  --accent-ink: #ffffff;
  --signal: #c86743;
  --new: #a65035;
  --recent: #386983;
  --fresh: #527568;
  --sans: "IBM Plex Sans", "Avenir Next", sans-serif;
  --mono: "IBM Plex Mono", "SFMono-Regular", monospace;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --canvas: #0e151a;
  --surface: #151e24;
  --raised: #1b272e;
  --ink: #eef3f5;
  --muted: #a4b0b7;
  --faint: #7e8d96;
  --line: #32424b;
  --line-strong: #5e727e;
  --accent: #8fb5ca;
  --accent-soft: #223943;
  --accent-ink: #10191e;
  --signal: #df805c;
  --new: #ef9574;
  --recent: #8abbd1;
  --fresh: #86b7a6;
}

@media (prefers-color-scheme: dark) {
  html[data-theme="auto"] {
    color-scheme: dark;
    --canvas: #0e151a;
    --surface: #151e24;
    --raised: #1b272e;
    --ink: #eef3f5;
    --muted: #a4b0b7;
    --faint: #7e8d96;
    --line: #32424b;
    --line-strong: #5e727e;
    --accent: #8fb5ca;
    --accent-soft: #223943;
    --accent-ink: #10191e;
    --signal: #df805c;
    --new: #ef9574;
    --recent: #8abbd1;
    --fresh: #86b7a6;
  }
}

* { box-sizing: border-box; }

html {
  background: var(--canvas);
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.55;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

button,
input,
select { font: inherit; }

button,
select { cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

[hidden] { display: none !important; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 9px 12px;
  transform: translateY(-160%);
  border-radius: 4px;
  background: var(--ink);
  color: var(--surface);
  font-size: 12px;
  font-weight: 600;
}

.skip-link:focus { transform: translateY(0); }

.page-shell {
  width: min(1320px, calc(100% - 48px));
  min-height: calc(100vh - 48px);
  margin: 24px auto;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  background: var(--surface);
  box-shadow: 0 18px 60px rgb(42 58 68 / 8%);
}

.page-shell::before {
  display: block;
  height: 3px;
  content: "";
  background: linear-gradient(90deg, var(--accent) 0 72%, var(--signal) 72% 76%, color-mix(in srgb, var(--accent) 42%, var(--surface)) 76% 100%);
}

.site-header {
  display: flex;
  height: 64px;
  align-items: center;
  justify-content: space-between;
  padding: 0 28px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 96%, transparent);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 4px;
  background: var(--accent);
  color: var(--accent-ink);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: -0.08em;
}

.brand-copy {
  display: grid;
  line-height: 1.1;
}

.brand-copy strong {
  font-size: 16px;
  font-weight: 600;
}

.brand-copy small {
  margin-top: 3px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 24px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.header-actions a { text-decoration: none; }
.header-actions a:hover { color: var(--accent); }

.theme-toggle {
  padding: 7px 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
}

.theme-toggle:hover { border-color: var(--accent); }

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 56px;
  padding: 50px 56px 40px;
  overflow: hidden;
  background:
    radial-gradient(circle at 88% -12%, color-mix(in srgb, var(--accent) 20%, transparent), transparent 35%),
    linear-gradient(125deg, color-mix(in srgb, var(--raised) 92%, var(--surface)) 0%, color-mix(in srgb, var(--accent-soft) 65%, var(--surface)) 100%);
}

.hero::after {
  position: absolute;
  top: -118px;
  right: 225px;
  width: 260px;
  height: 260px;
  border: 1px solid color-mix(in srgb, var(--accent) 16%, transparent);
  border-radius: 50%;
  box-shadow:
    0 0 0 34px color-mix(in srgb, var(--accent) 3.5%, transparent),
    0 0 0 72px color-mix(in srgb, var(--accent) 2.5%, transparent);
  content: "";
  pointer-events: none;
}

.hero-content,
.signal-board {
  position: relative;
  z-index: 1;
}

.eyebrow,
.section-index,
.empty-code {
  margin: 0 0 17px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.live-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 9px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--signal) 13%, transparent);
  animation: signal-pulse 2.6s ease-out infinite;
}

@keyframes signal-pulse {
  0%, 58% { box-shadow: 0 0 0 4px color-mix(in srgb, var(--signal) 13%, transparent); }
  82%, 100% { box-shadow: 0 0 0 10px transparent; }
}

.hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(38px, 4.2vw, 56px);
  font-weight: 500;
  letter-spacing: -0.045em;
  line-height: 1.03;
}

.hero h1 span { color: var(--accent); }

.hero-intro {
  max-width: 680px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.signal-board {
  display: grid;
  min-width: 250px;
  align-content: start;
  margin: 0;
  border-top: 1px solid var(--line-strong);
}

.signal-board div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 30px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.signal-board dt {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.signal-board dd {
  margin: 0;
  color: var(--accent);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.search-panel {
  padding: 0 56px 34px;
  background: color-mix(in srgb, var(--accent-soft) 38%, var(--surface));
}

.search-field {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  min-height: 58px;
  align-items: center;
  gap: 14px;
  padding: 0 17px;
  border: 1px solid color-mix(in srgb, var(--accent) 42%, var(--line));
  border-radius: 6px;
  background: var(--raised);
  box-shadow: 0 7px 24px color-mix(in srgb, var(--accent) 7%, transparent), inset 3px 0 0 var(--accent);
}

.search-icon {
  position: relative;
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--accent);
  border-radius: 50%;
}

.search-icon::after {
  position: absolute;
  right: -5px;
  bottom: -3px;
  width: 6px;
  height: 1.5px;
  content: "";
  transform: rotate(45deg);
  background: var(--accent);
}

.search-field input {
  width: 100%;
  padding: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
  font-size: 17px;
}

.search-field input::placeholder { color: var(--faint); }
.search-field input::-webkit-search-cancel-button { display: none; }

.search-field button {
  padding: 4px 0;
  border: 0;
  background: transparent;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 9px;
  text-transform: uppercase;
}

kbd {
  min-width: 24px;
  padding: 3px 6px;
  border: 1px solid var(--line);
  border-bottom-color: var(--line-strong);
  border-radius: 4px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 10px;
  text-align: center;
}

.filter-deck {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  min-height: 64px;
  align-items: center;
  gap: 28px;
  padding: 12px 28px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line-strong);
  background: color-mix(in srgb, var(--raised) 72%, var(--surface));
}

.topic-filter-group {
  display: grid;
  min-width: 0;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 13px;
}

.filter-axis-label {
  display: grid;
  flex: 0 0 auto;
  padding-right: 13px;
  border-right: 1px solid var(--line);
  font-family: var(--mono);
  line-height: 1.25;
  text-transform: uppercase;
}

.filter-axis-label span {
  color: var(--ink);
  font-size: 9px;
  letter-spacing: 0.05em;
}

.filter-axis-label small {
  margin-top: 3px;
  color: var(--faint);
  font-size: 7px;
  letter-spacing: 0.04em;
}

.category-scroller {
  display: flex;
  gap: 7px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.category-chip {
  flex: 0 0 auto;
  min-height: 34px;
  padding: 7px 11px;
  border: 1px solid transparent;
  border-radius: 4px;
  background: transparent;
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
  transition: border-color 150ms ease, background 150ms ease, color 150ms ease;
}

.category-chip:hover {
  border-color: var(--line-strong);
  color: var(--accent);
}

.category-chip[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 500;
}

.chip-count {
  margin-left: 5px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 9px;
}

.category-chip[aria-pressed="true"] .chip-count {
  color: color-mix(in srgb, var(--accent-ink) 68%, transparent);
}

.select-filters {
  display: flex;
  align-items: center;
  gap: 8px;
}

.select-filters label { display: block; }

.select-filters label > span {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.select-filters select {
  min-height: 34px;
  padding: 0 27px 0 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--surface);
  color: var(--muted);
  font-size: 11px;
}

.select-filters .tag-select select { max-width: 180px; }

.text-button {
  min-height: 34px;
  padding: 0 10px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 9px;
  text-transform: uppercase;
}

.text-button:hover { color: var(--accent); }

.results-section { padding: 0 48px 72px; }

.results-header {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  padding: 38px 0 22px;
  border-bottom: 1px solid var(--line-strong);
}

.results-header .section-index { margin: 0 0 8px; }

.results-header h2 {
  margin: 0;
  font-size: 30px;
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.1;
}

.result-context {
  margin: 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
  text-transform: uppercase;
}

.result-meta { text-align: right; }

.taxonomy-version {
  margin: 5px 0 0;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.035em;
  text-transform: uppercase;
}

.paper-list { counter-reset: papers; }

.paper-card {
  position: relative;
  counter-increment: papers;
  display: grid;
  grid-template-columns: 118px minmax(0, 1fr) 166px;
  gap: 34px;
  padding: 28px 0 30px;
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transform: translateY(6px);
  animation: paper-enter 360ms ease forwards;
}

.paper-card::before {
  position: absolute;
  top: 28px;
  bottom: 30px;
  left: -18px;
  width: 2px;
  border-radius: 2px;
  background: var(--accent);
  content: "";
  opacity: 0.55;
}

.paper-card[data-recency="new"]::before { background: var(--signal); opacity: 0.78; }
.paper-card[data-recency="recent"]::before { background: var(--recent); opacity: 0.72; }
.paper-card[data-recency="fresh"]::before { background: var(--fresh); opacity: 0.68; }

@keyframes paper-enter {
  to { opacity: 1; transform: translateY(0); }
}

.paper-index {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
  line-height: 1.65;
}

.paper-index::before {
  content: counter(papers, decimal-leading-zero) " / ";
  color: var(--ink);
  font-weight: 500;
}

.paper-date {
  display: block;
  margin-top: 5px;
  color: var(--muted);
}

.paper-main h3 {
  max-width: 820px;
  margin: 0;
  font-size: clamp(20px, 2vw, 27px);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.15;
}

.paper-main h3 a { text-decoration: none; }

.paper-main h3 a:hover,
.paper-main h3 a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 55%, transparent);
}

.title-link-cue {
  display: inline-block;
  margin-left: 0.25em;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.46em;
  opacity: 0.48;
  vertical-align: 0.5em;
  transition: opacity 150ms ease, transform 150ms ease;
}

.paper-main h3 a:hover .title-link-cue,
.paper-main h3 a:focus-visible .title-link-cue {
  opacity: 1;
  transform: translate(1px, -1px);
}

.paper-authors {
  margin: 9px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.paper-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 11px;
}

.paper-tag {
  min-height: 22px;
  padding: 2px 7px;
  border: 1px solid color-mix(in srgb, var(--line-strong) 72%, transparent);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 7px;
  letter-spacing: 0.035em;
  text-transform: uppercase;
  transition: border-color 150ms ease, background 150ms ease, color 150ms ease;
}

.paper-tag:hover,
.paper-tag[aria-pressed="true"] {
  border-color: color-mix(in srgb, var(--signal) 55%, var(--line));
  background: color-mix(in srgb, var(--signal) 8%, var(--raised));
  color: var(--signal);
}

.paper-abstract {
  display: -webkit-box;
  max-width: 840px;
  margin: 13px 0 0;
  overflow: hidden;
  color: color-mix(in srgb, var(--ink) 76%, var(--muted));
  font-size: 14px;
  line-height: 1.55;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.paper-abstract.is-expanded {
  display: block;
  overflow: visible;
  -webkit-line-clamp: unset;
}

.abstract-toggle {
  display: inline-block;
  margin-top: 10px;
  padding: 0;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.abstract-toggle:hover,
.abstract-toggle[aria-expanded="true"] {
  border-color: var(--accent);
  color: var(--accent);
}

.paper-aside {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.topic-label,
.recency-label {
  display: inline-flex;
  min-height: 24px;
  align-items: center;
  padding: 3px 7px;
  border: 1px solid var(--line);
  border-radius: 3px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 8px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.topic-label {
  max-width: 100%;
  border-color: color-mix(in srgb, var(--accent) 28%, var(--line));
  background: color-mix(in srgb, var(--accent-soft) 42%, transparent);
  color: var(--accent);
  line-height: 1.35;
}

.recency-label[data-recency="new"] {
  border-color: color-mix(in srgb, var(--new) 42%, var(--line));
  background: color-mix(in srgb, var(--new) 8%, var(--raised));
  color: var(--new);
}

.recency-label[data-recency="recent"] {
  border-color: color-mix(in srgb, var(--recent) 42%, var(--line));
  background: color-mix(in srgb, var(--recent) 8%, var(--raised));
  color: var(--recent);
}

.recency-label[data-recency="fresh"] {
  border-color: color-mix(in srgb, var(--fresh) 42%, var(--line));
  background: color-mix(in srgb, var(--fresh) 8%, var(--raised));
  color: var(--fresh);
}

.paper-links {
  display: flex;
  width: 100%;
  gap: 13px;
  margin-top: auto;
  padding-top: 15px;
  border-top: 1px solid var(--line);
}

.paper-links a {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 9px;
  text-decoration: none;
  text-transform: uppercase;
}

.empty-state {
  padding: 76px 24px;
  text-align: center;
}

.empty-state h3 {
  margin: 0;
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 500;
  letter-spacing: -0.035em;
}

.empty-state p:not(.empty-code) { color: var(--muted); }

.empty-state button,
.load-more {
  min-height: 40px;
  padding: 9px 14px;
  border: 1px solid var(--accent);
  border-radius: 4px;
  background: var(--accent);
  color: var(--accent-ink);
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
}

.load-more {
  display: block;
  width: min(340px, 100%);
  margin: 32px auto 0;
}

.load-more:hover,
.empty-state button:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px color-mix(in srgb, var(--accent) 15%, transparent);
}

.site-footer {
  display: flex;
  min-height: 110px;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 24px 48px;
  border-top: 1px solid var(--line-strong);
}

.site-footer p {
  max-width: 560px;
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

.site-footer p strong { color: var(--ink); }

.site-footer div {
  display: flex;
  gap: 20px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 9px;
  text-transform: uppercase;
}

.noscript {
  position: fixed;
  right: 20px;
  bottom: 20px;
  left: 20px;
  z-index: 100;
  margin: 0;
  padding: 14px;
  border-radius: 4px;
  background: var(--signal);
  color: white;
  text-align: center;
}

@media (max-width: 920px) {
  .hero {
    gap: 36px;
    padding-right: 36px;
    padding-left: 36px;
  }

  .search-panel {
    padding-right: 36px;
    padding-left: 36px;
  }

  .filter-deck { display: block; }

  .category-scroller { padding-bottom: 10px; }

  .select-filters {
    padding-top: 10px;
    border-top: 1px solid var(--line);
  }

  .paper-card {
    grid-template-columns: 94px minmax(0, 1fr) 142px;
    gap: 24px;
  }
}

@media (max-width: 720px) {
  .page-shell {
    width: 100%;
    min-height: 100vh;
    margin: 0;
    border: 0;
    box-shadow: none;
  }

  .site-header {
    height: 58px;
    padding: 0 18px;
  }

  .brand-copy small,
  .header-actions a { display: none; }

  .header-actions { gap: 0; }

  .hero {
    display: block;
    padding: 34px 20px 25px;
  }

  .hero::after {
    top: -148px;
    right: -88px;
  }

  .hero h1 {
    max-width: 8ch;
    font-size: 38px;
    line-height: 1.04;
  }

  .hero-intro {
    margin-top: 15px;
    font-size: 14px;
  }

  .signal-board {
    grid-template-columns: repeat(3, 1fr);
    min-width: 0;
    margin-top: 30px;
    border-bottom: 1px solid var(--line);
  }

  .signal-board div {
    display: grid;
    gap: 4px;
    padding: 11px 7px;
    border-right: 1px solid var(--line);
    border-bottom: 0;
  }

  .signal-board div:first-child { padding-left: 0; }
  .signal-board div:last-child { border-right: 0; }
  .signal-board dt { font-size: 7px; }
  .signal-board dd { font-size: 15px; }

  .search-panel { padding: 0 20px 24px; }
  .search-field { min-height: 52px; }
  .search-field input { font-size: 14px; }

  .filter-deck {
    min-height: 0;
    padding: 12px 20px;
    overflow: hidden;
  }

  .category-scroller {
    margin: 0 -20px;
    padding: 0 20px 10px;
  }

  .topic-filter-group {
    display: block;
  }

  .filter-axis-label {
    display: flex;
    align-items: baseline;
    gap: 7px;
    margin-bottom: 9px;
    padding: 0;
    border: 0;
  }

  .category-chip { min-height: 32px; }

  .select-filters {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .select-filters .tag-select { grid-column: 1 / -1; }
  .select-filters .tag-select select { max-width: none; }
  .select-filters .text-button { justify-self: end; }

  .select-filters select {
    width: 100%;
    min-width: 0;
  }

  .results-section { padding: 0 20px 48px; }

  .results-header {
    display: block;
    padding-top: 30px;
  }

  .results-header h2 { font-size: 28px; }
  .result-meta {
    margin-top: 10px;
    text-align: left;
  }

  .paper-card {
    display: block;
    padding: 24px 0 26px;
  }

  .paper-card::before {
    top: 24px;
    bottom: 26px;
    left: -10px;
  }

  .paper-index {
    display: flex;
    justify-content: space-between;
    margin-bottom: 14px;
  }

  .paper-date {
    display: inline;
    margin-top: 0;
  }

  .paper-main h3 {
    max-width: 19ch;
    font-size: 22px;
  }

  .paper-authors { line-height: 1.5; }

  .paper-abstract {
    font-size: 13px;
    -webkit-line-clamp: 3;
  }

  .paper-aside {
    flex-direction: row;
    flex-wrap: wrap;
    margin-top: 15px;
  }

  .paper-links {
    width: auto;
    margin-left: auto;
    padding: 4px 0 0;
    border: 0;
  }

  .site-footer {
    display: block;
    padding: 24px 20px;
  }

  .site-footer div {
    flex-wrap: wrap;
    margin-top: 20px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}