/* Nicholas B. King — academic site
   Sleek, minimal, slightly bluish slate-gray palette. Light mode only. */

:root {
  --color-bg: #eef1f4;
  --color-surface: #e3e9ee;
  --color-sand: #d5dde4;
  --color-text: #262b31;
  --color-muted: #5c6773;
  --color-border: #c7d1d9;
  --color-link: #45688f;
  --color-link-hover: #2f4b68;
  --color-accent: #55738f;
  --color-clay: #8a6b53;
  --color-focus: #c9a13b;
  --max-width: 1200px;
  --radius: 6px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-link); text-decoration: none; }
a:hover { color: var(--color-link-hover); text-decoration: underline; }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-text);
  color: #fff;
  padding: 10px 16px;
  z-index: 100;
  border-radius: 0 0 6px 0;
}
.skip-link:focus {
  left: 0;
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Navbar ---------- */

.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 36px;
  padding: 16px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  font-size: 1.55rem;
  color: var(--color-text);
}
.brand:hover { color: var(--color-clay); text-decoration: none; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links li {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-links li:not(:first-child)::before {
  content: "";
  display: inline-block;
  width: 1px;
  height: 16px;
  background: var(--color-border);
}

.nav-links a {
  color: var(--color-text);
  font-size: 0.95rem;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover { color: var(--color-clay); text-decoration: none; border-bottom-color: var(--color-clay); }
.nav-links a.active { border-bottom-color: var(--color-accent); color: var(--color-accent); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--color-text);
  margin-left: auto;
}

@media (max-width: 720px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    flex-direction: column;
    gap: 4px;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 12px 24px 20px;
  }
  .nav-links.open { display: flex; }
  .navbar { position: relative; }
}

/* ---------- Hero (two-column homepage) ---------- */

.hero {
  padding: 48px 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(280px, 380px) 1fr;
  gap: 56px;
  align-items: start;
}

.hero-left h1 {
  margin: 20px 0 18px;
  font-size: 1.9rem;
  color: var(--color-text);
}

.hero-photo {
  width: 220px;
  height: 275px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--color-border);
  box-shadow: 0 6px 20px rgba(38, 43, 49, 0.1);
}
.hero-photo img { width: 100%; height: 100%; object-fit: cover; }

.hero-quote {
  width: 220px;
  margin: 12px 0 0;
}
.hero-quote p {
  margin: 0 0 6px;
  font-style: italic;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--color-muted);
}
.hero-quote cite {
  display: block;
  font-style: normal;
  font-size: 0.78rem;
  color: var(--color-muted);
}

.position-block {
  margin: 0 0 14px;
  line-height: 1.5;
}
.position-block strong { color: var(--color-text); }

.hero-left .button-row { margin: 20px 0 8px; }

.hero-left .section-title {
  margin-top: 32px;
}

.button-row { display: flex; gap: 10px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 0.88rem;
  border: 1px solid var(--color-border);
}
.btn-primary {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.btn-primary:hover { background: #46617a; color: #fff; text-decoration: none; }
.btn-secondary {
  background: transparent;
  color: var(--color-text);
}
.btn-secondary:hover { background: var(--color-surface); text-decoration: none; }

/* ---------- Research boxes ---------- */

.hero-right .section-title { margin-top: 0; }

.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.research-box {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 20px 22px;
}
.research-box h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
  line-height: 1.4;
}
.research-box h3 a { color: var(--color-text); }
.research-box h3 a:hover { color: var(--color-link); }
.research-box p:last-child { margin-bottom: 0; }

@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .research-grid { grid-template-columns: 1fr; }
}

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

section.block { padding: 8px 0 48px; }

/* ---------- About page (fits one viewport, photo + text) ---------- */

section.about-section {
  padding: 48px 0 28px;
}

.about-grid {
  display: flex;
  align-items: center;
  gap: 44px;
}

.about-photo {
  flex: 0 0 auto;
}
.about-photo img {
  display: block;
  height: var(--about-photo-height, 380px);
  width: auto;
  max-width: 100%;
  border-radius: 12px;
  border: 1px solid var(--color-border);
  box-shadow: 0 6px 20px rgba(38, 43, 49, 0.1);
}

.about-text {
  flex: 1;
  min-width: 0;
}
.about-text h1 {
  margin: 0 0 12px;
  font-size: 1.5rem;
  color: var(--color-text);
}
.about-text p {
  margin: 0 0 10px;
  font-size: 0.85rem;
  line-height: 1.45;
}
.about-text p:last-child { margin-bottom: 0; }

@media (max-width: 860px) {
  .about-grid { flex-direction: column; }
  .about-photo img { height: auto; width: 100%; max-width: 320px; }
}

h2.section-title {
  font-size: 1.5rem;
  margin: 0 0 20px;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 10px;
}

h3.subhead {
  font-size: 1.05rem;
  margin: 28px 0 10px;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Accordion (homepage research areas) */

.accordion-item {
  border-bottom: 1px solid var(--color-border);
}
.accordion-header {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 16px 4px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--color-text);
  font-family: inherit;
}
.accordion-header:hover { color: var(--color-clay); }
.accordion-icon { transition: transform 0.18s ease; color: var(--color-muted); }
.accordion-item.open .accordion-icon { transform: rotate(45deg); }
.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.22s ease;
  padding: 0 4px;
  color: var(--color-muted);
}
.accordion-item.open .accordion-body {
  max-height: 400px;
  padding-bottom: 16px;
}

/* ---------- Publications list ---------- */

.tab-strip {
  position: sticky;
  top: 65px;
  background: var(--color-bg);
  z-index: 10;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 20px;
}

.tab-btn {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 0.88rem;
  cursor: pointer;
  color: var(--color-text);
  font-family: inherit;
}
.tab-btn:hover { background: var(--color-sand); }
.tab-btn.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.result-count {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin: 0 0 14px;
}

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

.pub-item {
  padding: 12px 4px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.96rem;
}
.pub-item .pub-year {
  color: var(--color-muted);
  font-variant-numeric: tabular-nums;
  margin-right: 10px;
  font-size: 0.85rem;
}
.pub-item .note {
  display: block;
  color: var(--color-muted);
  font-size: 0.85rem;
  margin-top: 2px;
}
.pub-item.hidden { display: none; }
.pub-item .read-link {
  white-space: nowrap;
  font-size: 0.85rem;
  margin-left: 6px;
}

.talk-row {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 16px;
  padding: 10px 4px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem;
}
.talk-row .talk-date { color: var(--color-muted); font-size: 0.85rem; }
.talk-row .talk-venue { color: var(--color-muted); font-size: 0.88rem; display: block; }
@media (max-width: 560px) {
  .talk-row { grid-template-columns: 1fr; gap: 2px; }
}

/* ---------- Cards / lists ---------- */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 24px;
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(45,41,38,0.06); }

@media (prefers-reduced-motion: reduce) {
  .card, .accordion-icon, .accordion-body { transition: none; }
}

.definition-list dt { font-weight: 600; margin-top: 14px; }
.definition-list dd { margin: 2px 0 0; color: var(--color-muted); }

table.plain { width: 100%; border-collapse: collapse; font-size: 0.94rem; }
table.plain td, table.plain th { padding: 8px 6px; border-bottom: 1px solid var(--color-border); text-align: left; vertical-align: top; }
table.plain td:last-child, table.plain th:last-child { text-align: right; white-space: nowrap; color: var(--color-muted); }

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

.site-footer {
  background: #22262b;
  color: #e6eaee;
  margin-top: 64px;
  padding: 36px 0 20px;
  font-size: 0.9rem;
}
.site-footer a { color: #aebdcb; }
.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  align-items: flex-start;
}
.footer-nav { display: flex; gap: 18px; flex-wrap: wrap; list-style: none; margin: 0; padding: 0; }
.footer-credit {
  font-size: 0.78rem;
  color: #8b96a1;
  margin-top: 18px;
  text-align: right;
}
.footer-credit a { color: #8b96a1; }

/* ---------- Plain lists (research areas, public lectures) ---------- */

.plain-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.plain-list li {
  padding: 12px 4px;
  border-bottom: 1px solid var(--color-border);
  font-size: 1rem;
}
.plain-list li:last-child { border-bottom: none; }

.plain-list-flush li {
  border-bottom: none;
  padding: 6px 4px;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}