/* Ghost Nil — technical report styles. No third-party runtime. */

:root {
  --bg: #f2ebe0;
  --bg-ink: #161412;
  --paper: #f7f1e7;
  --raised: #ebe3d4;
  --ink: #1b1814;
  --muted: #5f584e;
  --faint: #8a8276;
  --rule: #cfc4b0;
  --rule-strong: #1b1814;
  --oxblood: #8a2f22;
  --forest: #2d4a3c;
  --brass: #8a6d2f;
  --pass: #2d4a3c;
  --partial: #8a6d2f;
  --miss: #8a2f22;
  --link: #6e241a;
  --mono: "IBM Plex Mono", "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
  --sans: "Source Sans 3", "Source Sans Pro", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --measure: 40.5rem;
  --wide: 54rem;
  --radius: 2px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 1.5rem;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 12% -10%, rgba(138, 47, 34, 0.05), transparent 55%),
    var(--bg);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.62;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--link);
  text-underline-offset: 0.16em;
}

a:hover {
  color: var(--ink);
}

.skip {
  position: absolute;
  left: 0.75rem;
  top: -3rem;
  background: var(--bg-ink);
  color: var(--paper);
  padding: 0.4rem 0.7rem;
  z-index: 10;
}

.skip:focus {
  top: 0.75rem;
}

.frame {
  max-width: 72rem;
  margin: 0 auto;
  padding: 1.25rem 1.25rem 5rem;
}

.masthead {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  padding: 0.35rem 0 0.85rem;
  border-bottom: 1px solid var(--rule-strong);
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.masthead strong {
  color: var(--ink);
  font-weight: 600;
}

.hero {
  padding: 2.6rem 0 1.6rem;
  border-bottom: 1px solid var(--rule);
}

.kicker {
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--oxblood);
  margin: 0 0 0.85rem;
}

h1 {
  margin: 0 0 0.7rem;
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  line-height: 0.95;
  font-weight: 500;
  letter-spacing: -0.03em;
}

.dek {
  max-width: 38rem;
  margin: 0;
  font-size: 1.28rem;
  line-height: 1.4;
  color: var(--muted);
  font-weight: 400;
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.4rem;
  margin-top: 1.5rem;
  font-family: var(--sans);
  font-size: 0.88rem;
  color: var(--muted);
}

.meta-row span::before {
  content: "";
}

.layout {
  display: grid;
  grid-template-columns: 15.5rem minmax(0, 1fr);
  gap: 2.5rem;
  padding-top: 2rem;
}

.toc {
  position: sticky;
  top: 1.25rem;
  align-self: start;
  font-family: var(--sans);
  font-size: 0.84rem;
}

.toc h2 {
  margin: 0 0 0.7rem;
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  font-weight: 600;
}

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

.toc a {
  display: grid;
  grid-template-columns: 1.6rem 1fr;
  gap: 0.35rem;
  padding: 0.22rem 0;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.toc a:hover,
.toc a[aria-current="true"] {
  color: var(--ink);
}

.toc .n {
  color: var(--faint);
  font-variant-numeric: tabular-nums;
}

.article {
  min-width: 0;
  max-width: var(--wide);
}

.abstract {
  background: var(--raised);
  border: 1px solid var(--rule);
  padding: 1.15rem 1.25rem 0.3rem;
  margin: 0 0 2.4rem;
}

.abstract h2,
.section h2 {
  margin: 0 0 0.7rem;
}

.abstract h2 {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--oxblood);
  font-weight: 600;
}

.abstract p {
  max-width: var(--measure);
}

.section {
  padding: 0.4rem 0 2.1rem;
  border-top: 1px solid var(--rule);
}

.section > h2 {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  margin: 1.3rem 0 0.85rem;
  font-size: 1.7rem;
  font-weight: 500;
  letter-spacing: -0.02em;
}

.section > h2 .n {
  font-family: var(--sans);
  font-size: 0.8rem;
  color: var(--oxblood);
  letter-spacing: 0.08em;
}

h3 {
  margin: 1.6rem 0 0.55rem;
  font-size: 1.18rem;
  font-weight: 500;
}

p,
li {
  max-width: var(--measure);
}

p {
  margin: 0 0 0.95rem;
}

ul, ol {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
}

li + li {
  margin-top: 0.3rem;
}

.lede {
  font-size: 1.14rem;
}

.callout {
  border-left: 3px solid var(--oxblood);
  padding: 0.15rem 0 0.15rem 1rem;
  margin: 1.2rem 0 1.4rem;
  color: var(--muted);
}

.callout strong {
  color: var(--ink);
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 1.2rem 0 1.5rem;
  max-width: var(--wide);
}

.stat {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 0.85rem 0.9rem 0.75rem;
}

.stat .label {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
}

.stat .value {
  display: block;
  margin-top: 0.25rem;
  font-size: 1.7rem;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.stat .note {
  display: block;
  margin-top: 0.35rem;
  font-family: var(--sans);
  font-size: 0.8rem;
  color: var(--muted);
}

.figure {
  margin: 1.4rem 0 1.6rem;
  max-width: var(--wide);
}

.figure figcaption {
  margin-top: 0.55rem;
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--muted);
  max-width: 44rem;
}

.pipeline {
  display: grid;
  gap: 1px;
  background: #2a2622;
  border: 1px solid var(--bg-ink);
  font-family: var(--sans);
}

.step {
  display: grid;
  grid-template-columns: 4.6rem 8.4rem 1fr;
  gap: 0.9rem;
  align-items: baseline;
  background: var(--bg-ink);
  color: var(--paper);
  padding: 0.85rem 1rem;
}

.step .idx {
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #c9b49a;
}

.step strong {
  font-family: var(--serif);
  font-size: 1.12rem;
  font-weight: 500;
}

.step span {
  font-size: 0.86rem;
  line-height: 1.4;
  color: #d6cfc3;
}

.tiers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.7rem;
  margin: 1rem 0 0.4rem;
}

.tier {
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 1rem 1rem 0.35rem;
}

.tier h3 {
  margin: 0 0 0.35rem;
  font-size: 1.15rem;
}

.tier .when {
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--oxblood);
  margin-bottom: 0.7rem;
}

.tier li {
  max-width: none;
}

.table-wrap {
  overflow-x: auto;
  margin: 1rem 0 1.3rem;
  border: 1px solid var(--rule);
  background: var(--paper);
  max-width: var(--wide);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 0.88rem;
  line-height: 1.35;
}

th, td {
  text-align: left;
  padding: 0.48rem 0.7rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}

th {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--muted);
  background: var(--raised);
}

td {
  font-variant-numeric: tabular-nums;
}

tr:last-child td {
  border-bottom: 0;
}

.badge {
  display: inline-block;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.12rem 0.38rem;
  border: 1px solid currentColor;
  font-weight: 600;
}

.badge.pass { color: var(--pass); }
.badge.partial { color: var(--partial); }
.badge.miss { color: var(--miss); }

.bars {
  display: grid;
  gap: 0.7rem;
  margin: 1rem 0 1.4rem;
  max-width: 36rem;
}

.bar-row {
  display: grid;
  grid-template-columns: 6.2rem 1fr auto;
  gap: 0.7rem;
  align-items: center;
  font-family: var(--sans);
  font-size: 0.82rem;
}

.track {
  height: 0.62rem;
  background: #ddd3c2;
  display: flex;
  overflow: hidden;
}

.seg { height: 100%; }
.seg.pass { background: var(--pass); }
.seg.partial { background: var(--brass); }
.seg.miss { background: var(--oxblood); }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  font-family: var(--sans);
  font-size: 0.8rem;
  color: var(--muted);
  margin: -0.4rem 0 1.2rem;
}

.legend i {
  display: inline-block;
  width: 0.7rem;
  height: 0.7rem;
  margin-right: 0.35rem;
  vertical-align: -0.08rem;
}

.legend .pass { background: var(--pass); }
.legend .partial { background: var(--brass); }
.legend .miss { background: var(--oxblood); }

.cases {
  display: grid;
  gap: 0.7rem;
  margin: 1rem 0 1.3rem;
}

.case {
  border: 1px solid var(--rule);
  background: var(--paper);
  padding: 0.95rem 1rem 0.35rem;
}

.case header {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  margin-bottom: 0.4rem;
}

.case h3 {
  margin: 0;
}

.case .tag {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
}

.note-list {
  font-size: 0.95rem;
}

.note-list li {
  max-width: 46rem;
}

.footer {
  margin-top: 1.5rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--rule-strong);
  font-family: var(--sans);
  font-size: 0.84rem;
  color: var(--muted);
}

.footer p {
  max-width: 46rem;
}

code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: rgba(27, 24, 20, 0.06);
  padding: 0.05em 0.28em;
}

.mono {
  font-family: var(--mono);
  font-size: 0.86rem;
}

@media (max-width: 920px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--rule);
    margin-bottom: 0.5rem;
  }

  .toc ol {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 1rem;
  }
}

@media (max-width: 760px) {
  .tiers,
  .stats {
    grid-template-columns: 1fr;
  }

  .step {
    grid-template-columns: 3.4rem 1fr;
    gap: 0.45rem 0.8rem;
  }

  .step span {
    grid-column: 1 / -1;
  }

  .toc ol {
    grid-template-columns: 1fr;
  }

  .bar-row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}

@media print {
  body {
    background: white;
    color: black;
    font-size: 11pt;
  }

  .toc,
  .skip {
    display: none;
  }

  .layout {
    display: block;
  }

  .step {
    background: #111;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  a {
    color: inherit;
    text-decoration: none;
  }
}