/* ============================================================
   Ochs Labs — shared stylesheet
   ============================================================ */

:root {
  --paper:      #FAF8F3;
  --paper-2:    #F3F0E8;
  --card:       #FFFDF8;
  --ink:        #1C1B19;
  --ink-soft:   #55524C;
  --ink-faint:  #8A857C;
  --rule:       #DFDACD;
  --rule-soft:  #EBE7DC;
  --navy:       #1B3A63;
  --navy-deep:  #0E2340;
  --accent:     #2C4A6E;
  --tag-live:   #6B4A12;
  --tag-live-bg:#F6EAD2;
  --serif: 'Source Serif 4', 'Iowan Old Style', Georgia, serif;
  --sans:  'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono:  'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --wrap: 1080px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--accent); }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 2rem; }
.wrap--narrow { max-width: 760px; }

/* ---------- site header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 248, 243, 0.88);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--rule-soft);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  height: 62px;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}

.wordmark .mark {
  width: 22px;
  height: 22px;
  flex: 0 0 22px;
  border-radius: 3px;
  background: var(--navy);
  position: relative;
}

.wordmark .mark::after {
  content: "";
  position: absolute;
  inset: 5px;
  border: 1.5px solid rgba(255, 255, 255, 0.85);
  border-radius: 50%;
  border-left-color: transparent;
  border-bottom-color: transparent;
  transform: rotate(-20deg);
}

.site-nav {
  display: flex;
  gap: 1.6rem;
  font-size: 0.875rem;
}

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

.site-nav a:hover { color: var(--ink); border-bottom-color: var(--rule); }

/* ---------- hero ---------- */

.hero { padding: 5.5rem 0 4rem; }

.eyebrow {
  font-size: 0.75rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 1.5rem;
}

.hero h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.4rem, 5.4vw, 3.65rem);
  line-height: 1.06;
  letter-spacing: -0.022em;
  margin: 0 0 1.5rem;
  max-width: none;
}

.hero .lede {
  font-family: var(--serif);
  font-size: 1.3125rem;
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 44rem;
  margin: 0 0 2.25rem;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  padding: 0.55rem 1.1rem;
  border-radius: 5px;
  border: 1px solid var(--navy);
  transition: background-color 0.15s ease, color 0.15s ease;
}

.btn--solid { background: var(--navy); color: #fff; }
.btn--solid:hover { background: var(--navy-deep); }
.btn--ghost { color: var(--navy); border-color: var(--rule); background: transparent; }
.btn--ghost:hover { border-color: var(--navy); }

/* ---------- section scaffolding ---------- */

section { padding: 3.5rem 0; }

.section-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 2.25rem;
}

.section-head h2 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 0;
}

.section-head .note {
  font-size: 0.8125rem;
  color: var(--ink-faint);
  margin-left: auto;
}

/* ---------- focus grid ---------- */

.focus-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.25rem;
}

.focus h3 {
  font-family: var(--serif);
  font-size: 1.1875rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
  letter-spacing: -0.01em;
}

.focus .num {
  display: block;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--navy);
  margin-bottom: 0.65rem;
}

.focus p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--ink-soft);
}

/* ---------- research rows ---------- */

.rows { border-top: 1px solid var(--rule); }

.row {
  display: grid;
  grid-template-columns: 190px 1fr 130px;
  gap: 2rem;
  align-items: start;
  padding: 2.1rem 1rem 2.1rem 0;
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
  color: inherit;
  position: relative;
  transition: background-color 0.18s ease, padding-left 0.18s ease;
}

a.row:hover {
  background: var(--paper-2);
  padding-left: 1rem;
}

.row .meta { display: flex; flex-direction: column; gap: 0.55rem; }

.row .venue {
  font-size: 0.8125rem;
  color: var(--ink-soft);
  line-height: 1.45;
}

.tag {
  align-self: flex-start;
  font-family: var(--mono);
  font-size: 0.625rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  background: var(--paper-2);
  color: var(--ink-soft);
  border: 1px solid var(--rule);
}

.tag--live { background: var(--tag-live-bg); color: var(--tag-live); border-color: #E4D3AE; }
.tag--pub  { background: #E4EBF3; color: var(--navy); border-color: #C9D6E4; }

.row h3 {
  font-family: var(--serif);
  font-size: 1.375rem;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.015em;
  margin: 0 0 0.6rem;
}

a.row:hover h3 { color: var(--navy); }

.row p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--ink-soft);
  max-width: 60ch;
}

.row .keywords {
  margin-top: 0.9rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
}

.row .cta {
  justify-self: end;
  align-self: center;
  font-size: 0.8125rem;
  color: var(--navy);
  white-space: nowrap;
}

.row .cta.muted { color: var(--ink-faint); font-style: italic; }

a.row .cta .arrow { display: inline-block; transition: transform 0.18s ease; }
a.row:hover .cta .arrow { transform: translateX(4px); }

/* ---------- publications ---------- */

.pub-list { display: flex; flex-direction: column; gap: 1.6rem; }

.pub {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  gap: 0.5rem;
  font-size: 0.9375rem;
}

.pub .marker { font-family: var(--mono); font-size: 0.8125rem; color: var(--ink-faint); padding-top: 0.15rem; }
.pub .title { font-family: var(--serif); font-weight: 600; font-size: 1.0625rem; display: block; margin-bottom: 0.15rem; }
.pub .where { color: var(--ink-soft); display: block; margin-bottom: 0.45rem; font-size: 0.875rem; }
.pub .links { display: flex; flex-wrap: wrap; gap: 1.1rem; font-size: 0.8125rem; }
.pub .links a { color: var(--accent); text-decoration: none; border-bottom: 1px solid rgba(44, 74, 110, 0.3); }
.pub .links a:hover { border-bottom-color: var(--accent); }

/* ---------- about ---------- */

.about-body { max-width: none; margin: 0; }
.about-body p { margin: 0 0 1.15rem; font-size: 1.0625rem; line-height: 1.75; color: var(--ink); }
.about-body p:last-child { margin-bottom: 0; }
.about-body a { color: var(--accent); text-decoration: none; border-bottom: 1px solid rgba(44, 74, 110, 0.3); }
.about-body a:hover { border-bottom-color: var(--accent); }

.about-body .aside-line {
  margin-top: 1.6rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--rule-soft);
  font-size: 0.875rem;
  color: var(--ink-soft);
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--rule);
  margin-top: 2rem;
  padding: 2.5rem 0 3.5rem;
  font-size: 0.8125rem;
  color: var(--ink-faint);
}

.site-footer .wrap { display: flex; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }
.site-footer a { color: var(--ink-soft); text-decoration: none; border-bottom: 1px solid var(--rule); }
.site-footer a:hover { color: var(--ink); }

/* ============================================================
   Article pages
   ============================================================ */

.article { padding: 3.5rem 0 1rem; }

.breadcrumb { font-size: 0.8125rem; color: var(--ink-faint); margin: 0 0 2rem; }
.breadcrumb a { color: var(--ink-soft); text-decoration: none; border-bottom: 1px solid var(--rule); }
.breadcrumb a:hover { color: var(--ink); }

.article h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.9rem, 4.2vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 1rem;
  max-width: 24ch;
}

.byline { font-size: 0.9375rem; color: var(--ink-soft); margin: 0 0 0.35rem; }
.byline strong { color: var(--ink); font-weight: 600; }
.venue-line { font-size: 0.875rem; color: var(--ink-faint); margin: 0 0 1.75rem; }

.article-links { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 3rem; }

.prose { font-size: 1.0313rem; line-height: 1.72; }
.prose p { margin: 0 0 1.15rem; }
.prose h2 {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin: 3.25rem 0 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}
.prose h3 {
  font-family: var(--sans);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  margin: 2.25rem 0 0.75rem;
}
.prose h2 .secnum, .prose h3 .secnum {
  font-family: var(--mono);
  font-size: 0.75em;
  color: var(--ink-faint);
  margin-right: 0.55rem;
  font-weight: 400;
}
.prose ul, .prose ol { margin: 0 0 1.15rem; padding-left: 1.3rem; }
.prose li { margin-bottom: 0.5rem; }
.prose strong { font-weight: 600; }
.prose a { color: var(--accent); text-decoration: none; border-bottom: 1px solid rgba(44, 74, 110, 0.3); }
.prose a:hover { border-bottom-color: var(--accent); }

.abstract {
  background: var(--card);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--navy);
  border-radius: 0 6px 6px 0;
  padding: 1.5rem 1.75rem;
  margin: 0 0 2.5rem;
}
.abstract h2 {
  font-family: var(--sans);
  font-size: 0.6875rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 0.7rem;
  border: none;
  padding: 0;
}
.abstract p { margin: 0; font-size: 0.9688rem; color: var(--ink-soft); }

.callout {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.4rem 1.6rem;
  margin: 2rem 0;
}
.callout h4 {
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 0.75rem;
  font-weight: 600;
}
.callout ol, .callout ul { margin: 0; padding-left: 1.2rem; }
.callout li { font-size: 0.9375rem; margin-bottom: 0.55rem; }
.callout li:last-child { margin-bottom: 0; }

figure { margin: 2.5rem 0; }
figure.wide { margin-left: calc(-1 * min(9vw, 130px)); margin-right: calc(-1 * min(9vw, 130px)); }
.figbox {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.25rem;
  overflow-x: auto;
}
figcaption {
  font-size: 0.8438rem;
  line-height: 1.55;
  color: var(--ink-soft);
  margin-top: 0.85rem;
}
figcaption .figlabel { font-weight: 600; color: var(--ink); }

.triptych { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.triptych .panel { text-align: center; }
.triptych .panel .panel-title {
  font-family: var(--sans);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 0.4rem;
}
.triptych .panel .panel-sub {
  font-family: var(--mono);
  font-size: 0.6875rem;
  color: var(--ink-faint);
  margin-top: 0.35rem;
}
.triptych img { margin: 0 auto; height: 200px; width: auto; object-fit: contain; }
@media (max-width: 620px) { .triptych img { height: auto; width: 100%; } }

table.data {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9063rem;
  margin: 1.75rem 0;
}
table.data th, table.data td { text-align: left; padding: 0.6rem 0.9rem; border-bottom: 1px solid var(--rule-soft); }
table.data thead th {
  font-family: var(--sans);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  border-bottom: 1px solid var(--rule);
  font-weight: 600;
}
table.data td.num { font-family: var(--mono); font-size: 0.8438rem; }
.table-scroll { overflow-x: auto; }

.refs { font-size: 0.875rem; color: var(--ink-soft); counter-reset: ref; list-style: none; padding-left: 0; }
.refs li {
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.4rem;
  margin-bottom: 0.7rem;
  line-height: 1.5;
}
.refs li::before {
  counter-increment: ref;
  content: "[" counter(ref) "]";
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-faint);
  padding-top: 0.15rem;
}

mjx-container { overflow-x: auto; overflow-y: hidden; max-width: 100%; }
mjx-container[display="true"] { margin: 1.6rem 0 !important; }

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

@media (max-width: 900px) {
  .focus-grid { grid-template-columns: 1fr; gap: 1.75rem; }
  .row { grid-template-columns: 1fr; gap: 0.9rem; padding-right: 0; }
  .row .meta { flex-direction: row; align-items: center; gap: 0.85rem; flex-wrap: wrap; }
  .row .cta { justify-self: start; }
  figure.wide { margin-left: 0; margin-right: 0; }
}

@media (max-width: 620px) {
  .wrap { padding: 0 1.25rem; }
  .site-nav { gap: 1rem; font-size: 0.8125rem; }
  .site-nav .hide-sm { display: none; }
  .hero { padding: 3.5rem 0 2.5rem; }
  .hero .lede { font-size: 1.125rem; }
  section { padding: 2.5rem 0; }
  .triptych { grid-template-columns: 1fr; }
  .prose { font-size: 1rem; }
}