:root {
  --bg: #09090b;
  --bg-2: #121216;
  --card: #18181c;
  --ink: #f4f4f5;
  --muted: #a1a1aa;
  --line: rgba(255, 255, 255, 0.08);
  --accent: #fb7185;
  --accent-2: #fda4af;
  --ok: #4ade80;
  --serif: "Iowan Old Style", Palatino, Georgia, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --radius: 18px;
  --max: 1080px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html {
  background: var(--bg);
  color: var(--ink);
  min-height: 100%;
}
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  min-height: 100vh;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { color: #fff; text-decoration: underline; text-underline-offset: 3px; }

.skip {
  position: absolute;
  left: 12px;
  top: -48px;
  z-index: 40;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--bg);
  font-size: 13px;
  border-radius: 8px;
}
.skip:focus {
  top: 12px;
  color: var(--bg);
  text-decoration: none;
}

.masthead {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.masthead-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 10px 24px 0;
}
.brand-row {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 4px 0 8px;
}
.wordmark {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: 0.08em;
  margin: 0;
}
.wordmark a { color: var(--ink); text-decoration: none; }

nav.toc {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  font-size: 13px;
}
nav.toc a {
  color: var(--muted);
  text-decoration: none;
  padding: 4px 0;
}
nav.toc a:hover,
nav.toc a[aria-current="page"] { color: var(--ink); }
nav.toc a[aria-current="page"] { text-decoration: underline; text-underline-offset: 4px; }

main.page {
  max-width: var(--max);
  margin: 0 auto;
  padding: 40px 24px 72px;
}

.hero {
  padding: 28px 0 12px;
}
.hero h1 {
  font-family: var(--serif);
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  font-weight: 700;
}
.hero p.lead {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 40rem;
  margin: 0 0 28px;
}
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--ink); color: var(--bg); }
.btn-primary:hover { background: var(--accent); color: #fff; }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--ink); color: var(--ink); }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin: 28px 0;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.card h3 {
  margin: 0 0 8px;
  font-size: 15px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent-2);
}
.card p { margin: 0; color: var(--muted); }
.card .num {
  font-family: var(--serif);
  font-size: 2rem;
  color: var(--ink);
  margin-bottom: 6px;
}

.steps { counter-reset: step; }
.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.step:last-child { border-bottom: 0; }
.step .n {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--card);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  font-weight: 700;
  color: var(--accent-2);
}

h1, h2 { font-weight: 700; letter-spacing: -0.02em; }
h1 { font-size: 2rem; margin: 0 0 12px; }
h2 { font-size: 1.55rem; margin: 36px 0 12px; }
h3 {
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin: 28px 0 8px;
}
.doc-kicker {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 10px;
}
.meta { color: var(--muted); font-size: 14px; margin: 0 0 22px; }

.abstract, .box, .warn {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin: 16px 0;
}
.warn { border-color: rgba(251, 113, 133, 0.35); }

ul { padding-left: 1.2em; }
li { margin: 0.4em 0; color: var(--muted); }
li strong { color: var(--ink); }

code, pre { font-family: var(--mono); font-size: 13px; }
code {
  background: rgba(255,255,255,0.06);
  padding: 0.12em 0.4em;
  border-radius: 6px;
}
pre {
  background: #050506;
  color: #e4e4e7;
  padding: 16px 18px;
  overflow-x: auto;
  border-radius: 14px;
  border: 1px solid var(--line);
  line-height: 1.45;
}
pre code { background: none; padding: 0; }

table.stats {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  margin: 12px 0 22px;
}
table.stats th, table.stats td {
  border-bottom: 1px solid var(--line);
  padding: 10px 8px;
  text-align: left;
  vertical-align: top;
}
table.stats th {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}
td.mono, .mono { font-family: var(--mono); font-size: 12px; word-break: break-all; }

footer.site {
  max-width: var(--max);
  margin: 0 auto 40px;
  padding: 20px 24px 40px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
  line-height: 1.65;
}
footer.site a { color: var(--muted); }

input, textarea {
  font-family: inherit;
  font-size: 16px;
  width: 100%;
  max-width: 520px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  padding: 10px 12px;
  border-radius: 10px;
}
button {
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  background: var(--ink);
  color: var(--bg);
  border: 0;
  padding: 10px 16px;
  border-radius: 999px;
  cursor: pointer;
}
button:hover { background: var(--accent); color: #fff; }

details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin: 12px 0;
}
details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--ink);
}
details p, details ul { margin: 10px 0 0; }
.pill {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 10px;
  color: var(--muted);
  margin-right: 6px;
}

main.page.paper {
  max-width: 820px;
  background: #f7f3ea;
  color: #1b1b1b;
  border-radius: 24px;
  margin: 32px auto 48px;
  padding: 40px 36px 56px;
}
.paper a { color: #9f1239; }
.paper h2 { color: #1b1b1b; margin-top: 32px; }
.paper h3 { color: #9f1239; }
.paper .title {
  font-family: var(--serif);
  font-size: 1.7rem;
  line-height: 1.25;
  margin: 0 0 12px;
}
.paper .authors, .paper .meta, .paper li { color: #5a5854; }
.paper .abstract, .paper .box, .paper .warn, .paper .defn, .paper .rmk, .paper .lim {
  background: #fffdf8;
  border: 1px solid #d4cfc3;
  color: #1b1b1b;
}
.paper table.stats th, .paper table.stats td {
  border-color: #1b1b1b;
  color: #1b1b1b;
}
.paper table.stats th { background: #ebe6da; }
.paper pre { background: #1b1b1b; color: #f4f0e6; }
.paper code { background: #ece8dc; color: #1b1b1b; }
.toc-paper { columns: 2; font-size: 14px; margin: 16px 0 28px; }
.toc-paper a { color: #1b1b1b; }
.defn { border-left: 3px solid #1b1b1b; }
.lim { border-left: 3px solid #a31f34; }
.lab { font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; font-weight: 700; }
.eq { text-align: center; font-style: italic; margin: 12px 0; }
ol.refs { padding-left: 1.4em; font-size: 14px; }

@media print {
  nav.toc, .masthead-top, footer.site { display: none; }
  body { background: #fff; color: #000; }
}

@media (max-width: 720px) {
  .wordmark { font-size: 22px; }
  body { font-size: 16px; }
  .toc-paper { columns: 1; }
  main.page.paper { margin: 12px; padding: 24px 18px 40px; }
}