@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400;0,9..144,500;0,9..144,600;1,9..144,500&family=Source+Serif+4:ital,wght@0,400;0,600;1,400&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root {
  --paper: #ffffff;
  --paper-raised: #f5f7fa;
  --ink: #14213d;
  --ink-soft: #48536b;
  --ink-faint: #8b93a5;
  --accent: #8c6a3f;       /* brass / ledger gold */
  --accent-red: #a63d2e;   /* archive stamp red, used sparingly */
  --rule: #e2e6ec;
  --rule-strong: #ccd3dd;
  --font-display: 'Fraunces', serif;
  --font-body: 'Source Serif 4', Georgia, serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;
  --max-w: 920px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body::before {
  /* faint paper texture via layered gradients */
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(0,0,0,0.012) 0px, rgba(0,0,0,0.012) 1px, transparent 1px, transparent 3px);
  z-index: 0;
}

a {
  color: var(--ink);
  text-decoration: none;
}

.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
  position: relative;
  z-index: 1;
}

/* ---------- Header ---------- */

.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: relative;
  z-index: 2;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 22px;
  padding-bottom: 22px;
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.wordmark span {
  color: var(--accent);
  font-style: italic;
  font-weight: 500;
}

nav.site-nav {
  display: flex;
  gap: 30px;
}

nav.site-nav a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-soft);
  position: relative;
  padding-bottom: 4px;
  transition: color 0.2s ease;
}

nav.site-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

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

nav.site-nav a:hover::after,
nav.site-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

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

.hero {
  padding: 76px 0 64px;
  position: relative;
  z-index: 1;
}

.hero .wrap {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr;
  gap: 56px;
  align-items: start;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 18px;
  display: block;
}

h1.name {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  line-height: 1.05;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}

.role-line {
  font-family: var(--font-body);
  font-style: italic;
  font-size: 1.2rem;
  color: var(--ink-soft);
  margin: 0 0 26px;
}

.role-line strong {
  font-style: normal;
  color: var(--ink);
}

.field-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 8px;
}

.field-tags span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  border: 1px solid var(--rule-strong);
  border-radius: 2px;
  padding: 5px 10px;
  background: var(--paper-raised);
}

/* ---------- Ledger card (replaces headshot) ---------- */

.ledger-card {
  border: 1px solid var(--rule-strong);
  background: var(--paper-raised);
  padding: 26px 24px 22px;
  position: relative;
  box-shadow: 3px 3px 0 rgba(140, 106, 63, 0.08);
}

.ledger-card::before {
  content: "";
  position: absolute;
  top: 14px;
  right: -1px;
  width: 34px;
  height: 14px;
  background: var(--accent);
  clip-path: polygon(0 0, 100% 0, 88% 100%, 12% 100%);
  opacity: 0.85;
}

.ledger-card .catalog-no {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
  margin-bottom: 18px;
}

.hero-about {
  margin-top: 24px;
}

.hero-about p {
  margin: 0 0 14px;
  color: var(--ink);
  font-size: 0.98rem;
}

.hero-about p:last-child {
  margin-bottom: 0;
}

.headshot-plain {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  display: block;
  filter: grayscale(15%);
  border-radius: 16px;
}

.ledger-card .headshot {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  display: block;
  filter: grayscale(15%);
  border: 1px solid var(--rule-strong);
  margin-bottom: 18px;
}

.ledger-monogram {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: 3.6rem;
  line-height: 1;
  color: var(--ink);
  margin-bottom: 18px;
}

.ledger-monogram em {
  color: var(--accent);
  font-style: italic;
}

.ledger-rule {
  border: none;
  border-top: 1px dashed var(--rule-strong);
  margin: 14px 0;
}

.ledger-card dl {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
}

.ledger-card dt {
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--ink-faint);
  margin-top: 10px;
}

.ledger-card dd {
  margin: 2px 0 0;
  color: var(--ink);
}

/* ---------- Sections ---------- */

section {
  padding: 46px 0;
  border-top: 1px solid var(--rule);
  position: relative;
  z-index: 1;
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 26px;
}

.section-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
}

h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.5rem;
  margin: 0;
}

.about-body {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 40px;
}

.about-body p {
  margin: 0 0 16px;
  color: var(--ink);
}

.about-body p:last-child { margin-bottom: 0; }

.pull-note {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.7;
  color: var(--ink-soft);
  border-left: 2px solid var(--accent);
  padding-left: 16px;
}

/* ---------- Contact tabs ---------- */

.contact-tabs {
  border-bottom: 1px solid var(--rule);
}

.tab-radio {
  display: none;
}

.tab-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding: 10px 18px 12px 0;
  margin-right: 22px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.tab-label:hover {
  color: var(--ink);
}

.tab-radio:checked + .tab-label {
  color: var(--ink);
  border-bottom-color: var(--accent);
}

.tab-panel {
  display: none;
  padding: 24px 0 30px;
  font-size: 1rem;
  color: var(--ink);
}

.tab-panel a {
  border-bottom: 1px solid var(--rule-strong);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.tab-panel a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

#ctab-email:checked ~ #panel-email,
#ctab-dept:checked ~ #panel-dept,
#ctab-linkedin:checked ~ #panel-linkedin,
#ctab-nd:checked ~ #panel-nd {
  display: block;
}

@media (max-width: 500px) {
  .tab-label {
    margin-right: 14px;
    padding-right: 0;
  }
}

/* ---------- Contact ---------- */

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px 40px;
}

.contact-item dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 6px;
}

.contact-item dd {
  margin: 0;
  font-size: 1rem;
}

.contact-item a {
  border-bottom: 1px solid var(--rule-strong);
  transition: border-color 0.2s ease, color 0.2s ease;
}

.contact-item a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

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

footer.site-footer {
  border-top: 1px solid var(--rule);
  padding: 26px 0 40px;
}

footer.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--ink-faint);
}

/* ---------- Simple page (Research / Teaching / CV) ---------- */

.page-hero {
  padding: 56px 0 30px;
  border-bottom: none;
}

.page-hero h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2rem, 4vw, 2.6rem);
  margin: 0 0 10px;
}

.page-hero p.dek {
  font-style: italic;
  color: var(--ink-soft);
  font-size: 1.05rem;
  margin: 0;
  max-width: 60ch;
}

.placeholder-block {
  border: 1px dashed var(--rule-strong);
  background: var(--paper-raised);
  padding: 26px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-soft);
  line-height: 1.8;
}

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

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

.entry-list li {
  padding: 18px 0;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 20px;
}

.entry-list li:first-child { border-top: none; }

.entry-list .yr {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
}

.entry-list h3 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1.02rem;
  margin: 0 0 4px;
}

.entry-list p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.entry-list.no-year li {
  grid-template-columns: 1fr;
}

.entry-details summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.entry-details summary::-webkit-details-marker {
  display: none;
}

.entry-details summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  flex-shrink: 0;
  width: 14px;
  transition: transform 0.2s ease;
}

.entry-details[open] summary::before {
  content: "–";
}

.entry-details summary h3 {
  margin: 0;
}

.entry-details summary:hover h3 {
  color: var(--accent);
}

.entry-details p {
  margin: 12px 0 0 24px;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

/* ---------- Paper cards ---------- */

.paper-card {
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: var(--paper-raised);
  padding: 26px 28px;
  margin-bottom: 18px;
}

.paper-card:last-child { margin-bottom: 0; }

.paper-card h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.15rem;
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--ink);
}

.paper-byline {
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin: 0 0 16px;
}

.paper-actions {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.pill {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #fff;
  background: var(--ink);
  padding: 7px 18px;
  border-radius: 999px;
  transition: background 0.2s ease;
}

.pill:hover {
  background: var(--accent);
}

.abstract-toggle summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.03em;
  text-decoration: underline;
  color: var(--ink-soft);
}

.abstract-toggle summary::-webkit-details-marker {
  display: none;
}

.abstract-toggle summary:hover {
  color: var(--accent);
}

.abstract-toggle .label-hide {
  display: none;
}

.abstract-toggle[open] .label-show {
  display: none;
}

.abstract-toggle[open] .label-hide {
  display: inline;
}

.abstract-toggle p {
  margin: 18px 0 0;
  padding-left: 18px;
  border-left: 2px solid var(--accent);
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.7;
}

/* ---------- Responsive ---------- */

@media (max-width: 760px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .about-body { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  nav.site-nav { gap: 18px; }
  .entry-list li { grid-template-columns: 1fr; gap: 4px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}

/* focus visibility */
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}