/* ==========================================================================
   PoC Research Papers — "Reproduction Ledger"
   A bibliography styled as a lab ledger: hairline ruling, mono annotations,
   and a year spine whose bar lengths are the real per-year paper counts.
   ========================================================================== */

:root {
  color-scheme: light;

  --paper:      #F5F3EC;
  --surface:    #FFFDF7;
  --ink:        #171F2B;
  --muted:      #656C7A;
  --rule:       #D9D3C5;
  --rule-soft:  #E7E2D6;
  --blue:       #264C9E;
  --blue-wash:  #E6EAF4;
  --stamp:      #B23A2C;
  --stamp-wash: #F5E3DF;

  --f-display: 'Archivo', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --f-body:    'Newsreader', Georgia, 'Times New Roman', serif;
  --f-mono:    'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --gutter: clamp(1.25rem, 4vw, 3.5rem);
  --rail:   17rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper:      #111419;
    --surface:    #171B22;
    --ink:        #E7E3D8;
    --muted:      #98A0AE;
    --rule:       #2C323C;
    --rule-soft:  #21262E;
    --blue:       #6690E8;
    --blue-wash:  #1B2331;
    --stamp:      #CF6B57;
    --stamp-wash: #2E2320;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper:      #111419;
  --surface:    #171B22;
  --ink:        #E7E3D8;
  --muted:      #98A0AE;
  --rule:       #2C323C;
  --rule-soft:  #21262E;
  --blue:       #6690E8;
  --blue-wash:  #1B2331;
  --stamp:      #CF6B57;
  --stamp-wash: #2E2320;
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 17px;
  line-height: 1.6;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 3px; }

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

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 50;
  background: var(--ink);
  color: var(--paper);
  padding: .6rem 1rem;
  font-family: var(--f-mono);
  font-size: .8rem;
}
.skip:focus { left: 0; }

/* Hide the raw markdown until the ledger is assembled; revealed by script,
   and by the fallback rule below if the script never runs. */
.js #md { visibility: hidden; }
.js #md.ready { visibility: visible; }
#md.raw { max-width: 46rem; margin: 0 auto; padding: var(--gutter); }

/* --------------------------------------------------------------------------
   Masthead
   -------------------------------------------------------------------------- */

.masthead {
  padding: clamp(2.5rem, 7vw, 5rem) var(--gutter) 0;
  max-width: 82rem;
  margin: 0 auto;
  overflow: clip; /* guard: keeps a fallback face from widening the document */
}

.eyebrow {
  font-family: var(--f-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: .4rem .9rem;
  align-items: baseline;
}
.eyebrow .dot { color: var(--rule); }

/* Both lines stay unbroken — "PROOF-OF-CONCEPT" split at its hyphen reads as two
   different words — and both are set to the same measure so the block sits flush
   in the column. Archivo's width axis does the fitting: at these axis values the
   lines measure 12.35em (800/wdth 116) and 12.33em (400/wdth 125), so dividing
   the column width by 12.5 lands them edge to edge with a hair of slack. */
.masthead h1 {
  font-family: var(--f-display);
  font-size: calc((min(100vw, 82rem) - 2 * var(--gutter)) / 12.5);
  line-height: .92;
  letter-spacing: -.02em;
  text-transform: uppercase;
  margin: 0;
  font-weight: 800;
}
.masthead h1 span {
  display: block;
  white-space: nowrap;
}
.masthead h1 .l1 {
  font-stretch: 116%;
  font-variation-settings: 'wdth' 116;
}
.masthead h1 .l2 {
  font-weight: 400;
  font-stretch: 125%;
  font-variation-settings: 'wdth' 125;
}

/* Phones get the condensed cut (8.69em / 8.64em) so the title can stay large. */
@media (max-width: 48rem) {
  .masthead h1 {
    font-size: min(calc((100vw - 2 * var(--gutter)) / 8.8), 3.4rem);
  }
  .masthead h1 .l1 { font-stretch: 80%; font-variation-settings: 'wdth' 80; }
  .masthead h1 .l2 { font-stretch: 90%; font-variation-settings: 'wdth' 90; }
}

.lede {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  line-height: 1.5;
  max-width: 34em;
  margin: 1.75rem 0 0;
  color: var(--ink);
}

.byline {
  font-family: var(--f-mono);
  font-size: .72rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 1.25rem 0 0;
}
.byline a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--stamp);
  padding-bottom: .1rem;
}
.byline a:hover { color: var(--stamp); }

.badges { margin: 1.5rem 0 0; display: flex; gap: .5rem; flex-wrap: wrap; }
.badges img { height: 20px; display: block; }

/* --------------------------------------------------------------------------
   Signature: the year spine
   -------------------------------------------------------------------------- */

.spine {
  margin: clamp(2rem, 4vw, 3rem) 0 0;
  border-top: 1px solid var(--ink);
  padding-top: .35rem;
}

.spine-head {
  display: flex;
  justify-content: space-between;
  font-family: var(--f-mono);
  font-size: .68rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  padding-bottom: .75rem;
}

.spine-row {
  display: grid;
  grid-template-columns: 3.1rem 1fr 2.4rem;
  align-items: center;
  gap: .75rem;
  width: 100%;
  background: none;
  border: 0;
  border-bottom: 1px solid var(--rule-soft);
  padding: .28rem 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  text-decoration: none;
}
.spine-row:last-child { border-bottom: 0; }

.spine-row .yr {
  font-family: var(--f-mono);
  font-size: .78rem;
  font-weight: 500;
  letter-spacing: .04em;
  color: var(--muted);
  transition: color .15s;
}

.spine-row .track { display: block; width: 100%; }

.spine-row .bar {
  display: block;
  height: 11px;
  background: var(--blue);
  border-radius: 0 3px 3px 0;
  transition: background .15s, height .15s;
  min-width: 3px;
}

.spine-row .n {
  font-family: var(--f-mono);
  font-size: .72rem;
  color: var(--muted);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.spine-row:hover .bar,
.spine-row:focus-visible .bar { background: var(--stamp); }
.spine-row:hover .yr,
.spine-row:focus-visible .yr { color: var(--ink); }

.spine-row.is-active .bar { background: var(--stamp); height: 15px; }
.spine-row.is-active .yr,
.spine-row.is-active .n { color: var(--ink); font-weight: 600; }

/* --------------------------------------------------------------------------
   Shell: sticky rail + ledger column
   -------------------------------------------------------------------------- */

.shell {
  max-width: 82rem;
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4.5rem) var(--gutter) 6rem;
  display: grid;
  gap: 2rem;
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}

@media (min-width: 62rem) {
  .shell {
    grid-template-columns: var(--rail) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
  }
}

/* --- rail --- */

.rail { min-width: 0; }

@media (min-width: 62rem) {
  .rail {
    position: sticky;
    top: 1.75rem;
    max-height: calc(100vh - 3.5rem);
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-width: thin;
  }
}

.rail > summary {
  font-family: var(--f-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  cursor: pointer;
  padding: .8rem 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--rule);
  list-style: none;
  display: flex;
  justify-content: space-between;
}
.rail > summary::-webkit-details-marker { display: none; }
.rail > summary::after { content: '+'; }
.rail[open] > summary::after { content: '\2212'; }

@media (min-width: 62rem) {
  .rail > summary { display: none; }
}

.rail-body { padding-top: 1.25rem; }

.field { position: relative; margin-bottom: 1.75rem; }

.field input {
  width: 100%;
  font-family: var(--f-mono);
  font-size: .82rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: .6rem 2rem .6rem .7rem;
  -webkit-appearance: none;
  appearance: none;
}
.field input::placeholder { color: var(--muted); }
.field input:focus { border-color: var(--ink); outline: none; }

.field kbd {
  position: absolute;
  right: .55rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--f-mono);
  font-size: .68rem;
  color: var(--muted);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 0 .3rem;
  pointer-events: none;
}
.field input:focus + kbd,
.field input:not(:placeholder-shown) + kbd { opacity: 0; }

.rail h2 {
  font-family: var(--f-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
  margin: 0 0 .85rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.rail h2 button {
  font: inherit;
  letter-spacing: inherit;
  background: none;
  border: 0;
  padding: 0;
  color: var(--stamp);
  cursor: pointer;
  text-transform: uppercase;
}

.chips { display: flex; flex-wrap: wrap; gap: .35rem; margin: 0 0 1.75rem; }

.chip {
  font-family: var(--f-mono);
  font-size: .7rem;
  letter-spacing: .03em;
  color: var(--muted);
  background: none;
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: .2rem .45rem;
  cursor: pointer;
  transition: color .12s, border-color .12s, background .12s;
}
.chip:hover { color: var(--ink); border-color: var(--ink); }
.chip[aria-pressed="true"] {
  color: var(--paper);
  background: var(--ink);
  border-color: var(--ink);
}

.rail-spine .spine { margin-top: 0; border-top: 0; padding-top: 0; }
.rail-spine .spine-head { display: none; }
.rail-spine .spine-row { grid-template-columns: 2.6rem 1fr 1.8rem; gap: .5rem; }
.rail-spine .spine-row .bar { height: 8px; }
.rail-spine .spine-row.is-active .bar { height: 11px; }

.rail-foot {
  margin-top: 1.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-family: var(--f-mono);
  font-size: .7rem;
  line-height: 1.9;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .1rem;
}
.rail-foot a { color: var(--muted); text-decoration: none; border-bottom: 1px solid var(--rule); }
.rail-foot a:hover { color: var(--ink); border-color: var(--ink); }
.rail-foot button {
  font: inherit;
  background: none;
  border: 0;
  padding: 0;
  color: var(--muted);
  cursor: pointer;
  border-bottom: 1px solid var(--rule);
}
.rail-foot button:hover { color: var(--ink); border-color: var(--ink); }

/* --------------------------------------------------------------------------
   Views
   -------------------------------------------------------------------------- */

.main { min-width: 0; }

.viewbar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--ink);
  padding-top: .8rem;
  margin-bottom: 2.5rem;
}

.tabs { display: flex; gap: 1.25rem; }

.tab {
  font-family: var(--f-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  background: none;
  border: 0;
  padding: 0 0 .2rem;
  color: var(--muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
}
.tab:hover { color: var(--ink); }
.tab[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--stamp); }

.tally {
  font-family: var(--f-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.tally b { color: var(--ink); font-weight: 600; }

.view[hidden] { display: none; }

/* Names the columns the entries are ruled into, so the left gutter reads as an
   entry number rather than decoration. */
.ledger-head {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr) auto;
  gap: 0 .9rem;
  font-family: var(--f-mono);
  font-size: .62rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  padding-bottom: .4rem;
  margin-bottom: 1.75rem;
  border-bottom: 1px solid var(--rule);
}
.ledger-head span:first-child { text-align: right; }

.group { margin-bottom: clamp(2.5rem, 5vw, 4rem); scroll-margin-top: 1.5rem; }

.group-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  border-bottom: 1px solid var(--ink);
  padding-bottom: .35rem;
  margin-bottom: 1.5rem;
}

.group-head h3 {
  font-family: var(--f-display);
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  font-weight: 800;
  font-stretch: 108%;
  font-variation-settings: 'wdth' 108;
  letter-spacing: -.01em;
  line-height: 1;
  margin: 0;
  text-transform: uppercase;
}

.group-head .count {
  font-family: var(--f-mono);
  font-size: .72rem;
  color: var(--muted);
  margin-left: auto;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.group-note {
  font-size: .95rem;
  color: var(--muted);
  max-width: 46em;
  margin: -.75rem 0 1.75rem;
}

.subgroup { margin-bottom: 1.75rem; }

.subgroup-head {
  font-family: var(--f-mono);
  font-size: .7rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink);
  font-weight: 500;
  margin: 0 0 .5rem;
  display: flex;
  align-items: center;
  gap: .7rem;
}
.subgroup-head::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--rule);
}

/* --- the ledger rows --- */

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

.paper {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 0 .9rem;
  padding: .55rem 0;
  border-bottom: 1px solid var(--rule-soft);
}
.paper:hover { background: var(--surface); }

.paper .idx {
  font-family: var(--f-mono);
  font-size: .68rem;
  color: color-mix(in srgb, var(--muted) 55%, var(--paper));
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.paper:hover .idx { color: var(--muted); }

.paper .body { min-width: 0; }

.paper .title {
  line-height: 1.45;
  text-decoration: none;
  color: var(--ink);
  text-wrap: pretty;
}
a.title:hover { color: var(--blue); text-decoration: underline; }

.paper .tags {
  display: inline-flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin-left: .5rem;
  vertical-align: baseline;
}

.tag {
  font-family: var(--f-mono);
  font-size: .64rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: .05rem .3rem;
  white-space: nowrap;
}
.tag.venue { color: var(--blue); border-color: color-mix(in srgb, var(--blue) 35%, transparent); }
.tag.award {
  color: var(--stamp);
  border-color: color-mix(in srgb, var(--stamp) 40%, transparent);
  background: var(--stamp-wash);
}

.paper .src {
  font-family: var(--f-mono);
  font-size: .68rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
}
a.src:hover { color: var(--blue); }
.paper .src.none { color: var(--rule); font-style: normal; }

.paper[hidden] { display: none; }
.subgroup[hidden], .group[hidden] { display: none; }

/* --- empty state --- */

/* Narrow screens need the width for titles, so the entry gutter tightens. */
@media (max-width: 34rem) {
  .paper, .ledger-head { grid-template-columns: 1.7rem minmax(0, 1fr) auto; gap: 0 .5rem; }
  .paper .idx { font-size: .62rem; }
  .paper .src { font-size: .62rem; }
}

.empty {
  border: 1px dashed var(--rule);
  border-radius: 2px;
  padding: 2.5rem 1.5rem;
  text-align: center;
  color: var(--muted);
}
.empty p { margin: 0 0 1rem; }
.empty button {
  font-family: var(--f-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--paper);
  border: 0;
  border-radius: 2px;
  padding: .5rem .9rem;
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   Colophon
   -------------------------------------------------------------------------- */

.colophon {
  border-top: 1px solid var(--ink);
  max-width: 82rem;
  margin: 0 auto;
  padding: 2rem var(--gutter) 4rem;
  display: grid;
  gap: 2rem;
  grid-template-columns: minmax(0, 1fr);
}
@media (min-width: 48rem) {
  .colophon { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 3rem; }
}

.colophon h2 {
  font-family: var(--f-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
  margin: 0 0 .75rem;
}
.colophon p { margin: 0 0 .75rem; font-size: .95rem; }
.colophon ul { margin: 0; padding-left: 1.1rem; font-size: .95rem; }

/* --------------------------------------------------------------------------
   Fallback styling for the raw markdown (no JS)
   -------------------------------------------------------------------------- */

#md.raw h1 { font-family: var(--f-display); font-size: 2.6rem; line-height: 1; text-transform: uppercase; }
#md.raw h2 { font-family: var(--f-display); margin-top: 2.5rem; border-bottom: 1px solid var(--ink); }
#md.raw h3 { font-family: var(--f-display); margin-top: 2rem; }
#md.raw h4 { font-family: var(--f-mono); font-size: .8rem; letter-spacing: .1em; text-transform: uppercase; }
#md.raw li { margin-bottom: .4rem; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}