/* Theme: follows the OS by default; the ?__theme=dark|light param Spaces
   passes to the iframe forces it via data-theme (set inline in index.html). */
:root { color-scheme: light dark; }
:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }

:root {
  --ink: light-dark(#1c1e22, #e6e6e2);
  --muted: light-dark(#6b6e76, #a0a3ab);
  --faint: light-dark(#9a9da4, #71747c);
  --ground: light-dark(#fbfbf9, #17181b);
  --panel: light-dark(#f4f4f0, #1f2126);
  --hairline: light-dark(#e3e2dd, #2f3238);
  --field-bg: light-dark(#ffffff, #202329);
  --mark: light-dark(#f5e34d66, #d9c53f40);
  --hf-bg: light-dark(#fdf6e3, #2a2416);
  --hf-border: light-dark(#e8d9b8, #4a3f22);
  --hf-border-hover: #c9a94f;
  --hf-accent: light-dark(#8a6d1f, #d9b856);
  /* Per-service link chip colors, loosely brand-derived. The HF chip is the
     only filled one; the rest carry their color on the border and icon. */
  --arxiv-border: light-dark(#ecc9c3, #4e2823);
  --arxiv-accent: light-dark(#a3352a, #e08579);
  --official-border: light-dark(#c5daec, #27455c);
  --official-accent: light-dark(#2a6fa8, #7db3dd);
  --gh-border: light-dark(#d9cde8, #3f3352);
  --gh-accent: light-dark(#6a4f95, #b49ddb);
  --project-border: light-dark(#c2e0d6, #24493c);
  --project-accent: light-dark(#1f7a5e, #6cc4a5);
  /* Venue hues are tuned for light; mix toward white on dark for contrast. */
  --vc-mix: light-dark(100%, 72%);
  --v-iclr: #4f5bd5;
  --v-other: #7a7d84;
  --sans: "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0 auto;
  padding: 0 24px 80px;
  max-width: 1080px;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
}

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

.masthead {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding: 36px 0 20px;
  border-bottom: 1px solid var(--ink);
}

.eyebrow {
  margin: 0 0 2px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.eyebrow a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid var(--hairline);
}

.eyebrow a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.masthead h1 {
  margin: 0;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.corpus {
  margin: 0;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--muted);
  text-align: right;
  white-space: nowrap;
}

/* ---------- search ---------- */

.searchbar {
  display: flex;
  align-items: stretch;
  gap: 12px;
  margin: 24px 0 28px;
}

.search-field {
  flex: 1;
  display: flex;
  border: 1.5px solid var(--ink);
  background: var(--field-bg);
}

.search-field:focus-within {
  outline: 2px solid var(--v-iclr);
  outline-offset: 2px;
}

#q {
  flex: 1;
  border: 0;
  padding: 12px 14px;
  font: inherit;
  font-size: 16px;
  background: transparent;
}

#q:focus { outline: none; }

#search-btn {
  border: 0;
  padding: 0 22px;
  background: var(--ink);
  color: var(--ground);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

#search-btn:focus-visible,
.mode-btn:focus-visible,
.facets summary:focus-visible,
#more:focus-visible {
  outline: 2px solid var(--v-iclr);
  outline-offset: 2px;
}

.mode {
  display: flex;
  border: 1px solid var(--hairline);
  background: var(--panel);
  padding: 3px;
  gap: 3px;
}

.mode-btn {
  border: 0;
  padding: 0 16px;
  background: transparent;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12.5px;
  cursor: pointer;
}

.mode-btn.is-active {
  background: var(--field-bg);
  color: var(--ink);
  box-shadow: 0 0 0 1px var(--hairline);
}

/* ---------- layout ---------- */

.layout {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 36px;
  align-items: start;
}

/* ---------- facets ---------- */

.facets {
  position: sticky;
  top: 16px;
}

/* Flex lives on an inner wrapper: details slots its children into a single
   ::details-content box, so flex/gap on the details element itself would not
   space the facet groups. */
.facets-body {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

/* The disclosure summary only exists for narrow screens; on wide layouts the
   panel is always open (app.js keeps the open attribute in sync). */
.facets summary {
  display: none;
  list-style: none;
}

.facets summary::-webkit-details-marker { display: none; }

.facet-group h2 {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
}

.facet {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 3px 0;
  font-size: 13.5px;
  cursor: pointer;
  user-select: none;
}

.facet input {
  accent-color: var(--ink);
  margin: 0;
}

.facet .swatch {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--vc, var(--v-other));
  flex: none;
}

.facet .n {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--faint);
}

#sort,
.year-range select {
  width: 100%;
  padding: 6px 8px;
  font: inherit;
  font-size: 13.5px;
  border: 1px solid var(--hairline);
  background: var(--field-bg);
  color: var(--ink);
}

.year-range {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--faint);
}

#sort:disabled { color: var(--faint); background: var(--panel); }

/* ---------- results ---------- */

.results-header {
  padding: 2px 0 10px;
  border-bottom: 1px solid var(--hairline);
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--muted);
  min-height: 30px;
}

.paper {
  padding: 16px 0 16px 14px;
  border-bottom: 1px solid var(--hairline);
  border-left: 3px solid var(--vc, var(--v-other));
  margin-left: -17px;
  padding-left: 28px;
}

.paper .meta {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--mono);
  font-size: 11.5px;
  margin-bottom: 5px;
}

.paper .venue {
  color: color-mix(in srgb, var(--vc, var(--v-other)) var(--vc-mix), white);
  font-weight: 500;
  letter-spacing: 0.03em;
  text-decoration: none;
}

.paper .venue:hover {
  text-decoration: underline;
}

.paper .ptype {
  color: var(--muted);
  border: 1px solid var(--hairline);
  padding: 0 6px;
  border-radius: 3px;
}

.paper .ptype.is-highlight {
  color: var(--ink);
  border-color: var(--ink);
}

.paper .score {
  margin-left: auto;
  color: var(--faint);
}

.paper h3 {
  margin: 0 0 3px;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.paper .authors {
  margin: 0 0 6px;
  font-size: 13px;
  color: var(--muted);
}

.paper .abstract {
  margin: 0 0 8px;
  font-size: 13.5px;
  color: var(--ink);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  cursor: pointer;
}

.paper .abstract.is-open {
  display: block;
  -webkit-line-clamp: unset;
}

.paper .links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11.5px;
}

.paper .links a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 9px;
  border: 1px solid var(--hairline);
  border-radius: 3px;
  background: var(--field-bg);
  color: var(--ink);
  text-decoration: none;
}

.paper .links a:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.paper .links a:focus-visible {
  outline: 2px solid var(--v-iclr);
  outline-offset: 1px;
}

.paper .links a svg {
  width: 12px;
  height: 12px;
  fill: currentColor;
  flex: none;
}

.paper .links a.listing {
  border-style: dashed;
  background: transparent;
  color: var(--faint);
}

.paper .links a.listing:hover {
  color: var(--muted);
  border-color: var(--muted);
}

/* Chips with a trailing count segment (HF upvotes, GitHub stars) drop the
   right padding so the segment sits flush against the edge. */
.paper .links a.count { padding-right: 0; }

.paper .links .hf {
  border-color: var(--hf-border);
  background: var(--hf-bg);
}

.paper .links .hf b {
  margin-left: 6px;
  padding: 2px 8px;
  border-left: 1px solid var(--hf-border);
  color: var(--hf-accent);
  font-weight: 600;
}

.paper .links .hf:hover,
.paper .links .hf:hover b { border-color: var(--hf-border-hover); }

.paper .links .official { border-color: var(--official-border); }
.paper .links .official:hover { border-color: var(--official-accent); }

.paper .links .arxiv { border-color: var(--arxiv-border); }
.paper .links .arxiv svg { fill: var(--arxiv-accent); }
.paper .links .arxiv:hover { border-color: var(--arxiv-accent); }

.paper .links .gh { border-color: var(--gh-border); }
.paper .links .gh svg { fill: var(--gh-accent); }

.paper .links .gh b {
  margin-left: 6px;
  padding: 2px 8px;
  border-left: 1px solid var(--gh-border);
  color: var(--gh-accent);
  font-weight: 600;
}

.paper .links .gh:hover,
.paper .links .gh:hover b { border-color: var(--gh-accent); }

.paper .links .project { border-color: var(--project-border); }
.paper .links .project:hover { border-color: var(--project-accent); }

mark {
  background: var(--mark);
  color: inherit;
  padding: 0 1px;
}

#more {
  display: block;
  margin: 20px auto 0;
  padding: 8px 24px;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 13.5px;
  cursor: pointer;
}

#more:hover { background: var(--panel); }

.empty {
  padding: 32px 0;
  color: var(--muted);
  font-size: 14px;
}

/* ---------- colophon ---------- */

.colophon {
  margin-top: 48px;
  padding-top: 14px;
  border-top: 1px solid var(--hairline);
}

.colophon p {
  margin: 0;
  font-size: 12.5px;
  color: var(--faint);
  max-width: 640px;
}

.colophon a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline);
}

.colophon a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ---------- toast ---------- */

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--ground);
  padding: 10px 18px;
  font-size: 13.5px;
  border-radius: 4px;
  max-width: 80vw;
}

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

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; gap: 20px; }
  .facets { position: static; }
  .facets-body { flex-direction: row; flex-wrap: wrap; gap: 18px 24px; }

  .facets[open] summary { margin-bottom: 16px; }

  .facets summary {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 9px 12px;
    border: 1px solid var(--hairline);
    background: var(--panel);
    font-family: var(--mono);
    font-size: 12.5px;
    color: var(--ink);
    cursor: pointer;
    user-select: none;
  }

  .facets summary::before {
    content: "▸";
    color: var(--faint);
  }

  .facets[open] summary::before { content: "▾"; }

  .facets summary .n {
    margin-left: auto;
    padding: 0 8px;
    border-radius: 999px;
    background: var(--ink);
    color: var(--ground);
    font-family: var(--mono);
    font-size: 11px;
    line-height: 18px;
  }
  .searchbar { flex-direction: column; }
  .mode { align-self: flex-start; }
  .mode-btn { padding: 6px 16px; }
  .masthead { flex-direction: column; align-items: flex-start; gap: 6px; }
  .corpus { text-align: left; }
}

@media (prefers-reduced-motion: no-preference) {
  .paper { animation: rise 0.25s ease both; }
  @keyframes rise {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: none; }
  }
}