:root {
  --ink: #12181B;
  --ink-soft: #253238;
  --paper: #F3EFE6;
  --paper-dim: #E9E3D5;
  --azure: #1F3A34;
  --brass: #A9782F;
  --brass-soft: #C89A52;
  --glacier: #6E8FA3;
  --brick: #A23B2E;

  --font-display: 'Fraunces', serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
}

/* Dark palette: applied when the user hasn't chosen (follows OS setting)
   and, identically, when they've explicitly toggled dark via the header
   switch (see theme-toggle script in render.js, which sets data-theme and
   persists it to localStorage). */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --ink: #EDE7DA;
    --ink-soft: #B8AF9E;
    --paper: #14181A;
    --paper-dim: #1D2224;
    --azure: #5DADE7;
    --brass: #D3A55C;
    --brass-soft: #E6C489;
    --glacier: #8FB4C9;
    --brick: #E07A63;
  }
}
:root[data-theme="dark"] {
  --ink: #EDE7DA;
  --ink-soft: #B8AF9E;
  --paper: #14181A;
  --paper-dim: #1D2224;
  --azure: #5DADE7;
  --brass: #D3A55C;
  --brass-soft: #E6C489;
  --glacier: #8FB4C9;
  --brick: #E07A63;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.15s ease, color 0.15s ease;
}

a { color: inherit; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--brass); outline-offset: 3px; }

.wrap {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Header / ledger rule ---------- */

.site-header {
  border-bottom: 1px solid var(--ink);
  padding: 20px 24px;
  position: sticky;
  top: 0;
  background: var(--paper);
  z-index: 10;
}

.site-header-inner {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark {
  width: 32px;
  height: 32px;
}

.site-nav {
  display: flex;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.site-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.site-nav a:hover, .site-nav a.active { color: var(--brass); border-bottom-color: var(--brass); }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  padding: 0;
  border: 1px solid var(--ink-soft);
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
}
.theme-toggle:hover { border-color: var(--brass); color: var(--brass); }
.theme-toggle svg { width: 15px; height: 15px; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .theme-toggle .icon-sun { display: none; }
  :root:not([data-theme]) .theme-toggle .icon-moon { display: block; }
}

.ledger-rule {
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--brass) 0, var(--brass) 6px, transparent 6px, transparent 12px);
  margin: 40px 0;
}

/* ---------- Hero ---------- */

.hero {
  padding: 72px 0 56px;
  border-bottom: 1px solid var(--ink);
}

.eyebrow {
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--brick);
  margin-bottom: 18px;
}

.headline {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2rem, 5vw, 3.1rem);
  line-height: 1.12;
  margin: 0 0 24px;
  color: var(--azure);
}

.sub {
  font-size: 1.1rem;
  max-width: 60ch;
  color: var(--ink-soft);
  margin-bottom: 32px;
}

.cta-row { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 12px 20px;
  border: 1px solid var(--ink);
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn.primary { background: var(--azure); color: var(--paper); border-color: var(--azure); }
.btn.primary:hover { background: var(--brass); border-color: var(--brass); color: var(--ink); }

/* ---------- Paper list / ledger index ---------- */

.paper-index { padding: 48px 0; }

.paper-row {
  display: grid;
  grid-template-columns: 2.2rem 1fr auto;
  gap: 18px;
  align-items: baseline;
  padding: 22px 0;
  border-bottom: 1px solid var(--paper-dim);
  text-decoration: none;
  color: var(--ink);
}
.paper-row:hover .paper-title { color: var(--brass); }

.paper-num {
  font-family: var(--font-mono);
  color: var(--brass);
  font-size: 0.85rem;
}

.paper-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.25rem;
  margin: 0 0 6px;
}

.paper-abstract {
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin: 0;
}

.status-pill {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 9px;
  border: 1px solid var(--ink-soft);
  color: var(--ink-soft);
  white-space: nowrap;
  height: fit-content;
}
.status-pill.published { border-color: var(--azure); color: var(--azure); }

.paper-row-disabled {
  cursor: default;
  opacity: 0.55;
}
.paper-row-disabled:hover .paper-title { color: inherit; }

.related-row {
  grid-template-columns: 2rem 1fr;
}

/* ---------- Paper body ---------- */

.paper-page { padding: 48px 0 100px; }

.paper-header { margin-bottom: 40px; }

.paper-header-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  flex-wrap: wrap;
}

.publication-meta {
  display: flex;
  gap: 0;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-soft);
}
.publication-meta span + span::before {
  content: "·";
  margin: 0 0.65em;
  color: var(--glacier);
}
.publication-meta time { font: inherit; }
.publication-date-pending { font-style: italic; }

.paper-header h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  color: var(--azure);
  line-height: 1.15;
  margin: 12px 0 16px;
}

.paper-tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 18px; }
.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--glacier);
  border: 1px solid var(--glacier);
  padding: 3px 8px;
}

.block { margin-bottom: 26px; }

.section-heading {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.4rem;
  color: var(--azure);
  margin: 48px 0 18px;
  padding-top: 24px;
  border-top: 1px solid var(--paper-dim);
}

p.paragraph, p.dropcap { font-size: 1.05rem; }

p.dropcap::first-letter {
  font-family: var(--font-display);
  font-size: 3.6rem;
  font-weight: 600;
  float: left;
  line-height: 0.85;
  margin: 4px 8px 0 0;
  color: var(--brass);
}

.pullquote {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.35rem;
  line-height: 1.4;
  color: var(--azure);
  border-left: 3px solid var(--brass);
  padding: 4px 0 4px 22px;
  margin: 40px 0;
}

.keystat {
  display: flex;
  align-items: baseline;
  gap: 16px;
  border: 1px solid var(--ink);
  padding: 18px 22px;
  margin: 32px 0;
  background: var(--paper-dim);
}
.keystat-value {
  font-family: var(--font-mono);
  font-size: 2.1rem;
  color: var(--brick);
  font-weight: 500;
}
.keystat-label { font-size: 0.92rem; color: var(--ink-soft); }

.sidenote {
  font-size: 0.92rem;
  color: var(--ink-soft);
  border-left: 2px solid var(--paper-dim);
  padding-left: 16px;
  margin: 24px 0;
}
.sidenote::before {
  content: "Note — ";
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--glacier);
}

.evidence-ref {
  font-family: var(--font-mono);
  font-size: 0.68em;
  line-height: 0;
  margin-left: 0.12em;
  vertical-align: super;
}
.evidence-ref a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}
.evidence-ref a:hover { color: inherit; }

.evidence-kicker {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--brick);
}
.evidence-back {
  color: var(--ink-soft);
  text-decoration: none;
  text-transform: none;
  letter-spacing: 0;
}
.evidence-back:hover { color: var(--brass); }
.evidence-body h3 {
  font-family: var(--font-display);
  color: var(--azure);
  margin-top: 32px;
}
.evidence-body li { margin-bottom: 0.45rem; }

.related {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--ink);
}
.related h3 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  margin-bottom: 14px;
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--ink);
  padding: 32px 0 64px;
  font-size: 0.85rem;
  color: var(--ink-soft);
}
.footer-status {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--brick);
  margin-bottom: 10px;
}

.footer-note {
  font-size: 0.92rem;
  line-height: 1.5;
  margin-bottom: 12px;
}

@media (max-width: 560px) {
  .paper-row { grid-template-columns: 1fr; gap: 6px; }
  .status-pill { justify-self: start; }
}