/* ---------------------------------------------------------
   Lauren Tilton — academic site
   Clean, minimal academic style. Self-contained, no web fonts.
--------------------------------------------------------- */

:root {
  --bg: #faf8f4;
  --bg-alt: #f2efe8;
  --ink: #232120;
  --ink-soft: #4b4744;
  --rule: #ddd6ca;
  --accent: #1d3557;
  --accent-soft: #4a6fa5;
  --serif: Georgia, 'Iowan Old Style', 'Palatino Linotype', 'Book Antiqua', Palatino, 'Times New Roman', serif;
  --sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --max: 46rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

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

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

.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.site-header .wrap {
  max-width: 58rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.brand {
  font-family: var(--serif);
  font-weight: bold;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.01em;
}

nav.primary-nav {
  display: flex;
  gap: 1.5rem;
  font-family: var(--sans);
  font-size: 0.92rem;
}

nav.primary-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}

nav.primary-nav a:hover,
nav.primary-nav a[aria-current="page"] {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--rule);
  border-radius: 4px;
  font-size: 1.1rem;
  padding: 0.3rem 0.6rem;
  cursor: pointer;
  color: var(--ink);
}

/* ---------- Hero (home page) ---------- */

.hero {
  max-width: 58rem;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 2.5rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.hero .hero-photo {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--rule);
  flex-shrink: 0;
}

.hero .hero-text { flex: 1; }

.hero h1 {
  font-size: 2.1rem;
  margin: 0 0 0.4rem;
  letter-spacing: 0.01em;
}

.hero .title-lines p {
  margin: 0.15rem 0;
  color: var(--ink-soft);
  font-size: 1.02rem;
}

.hero .contact-line {
  margin-top: 1rem;
  font-family: var(--sans);
  font-size: 0.92rem;
}

.hero .contact-line a { margin-right: 1rem; }
.hero .social-links { margin-top: 1rem; }
.social-links a { white-space: nowrap; }

/* ---------- Page header (interior pages) ---------- */

.page-header {
  max-width: 58rem;
  margin: 0 auto;
  padding: 2.75rem 1.5rem 1rem;
}

.page-header h1 {
  font-size: 1.9rem;
  margin: 0 0 0.35rem;
}

.page-header .subtitle {
  color: var(--ink-soft);
  font-size: 1rem;
  margin: 0;
}

/* ---------- Main content ---------- */

main {
  max-width: 58rem;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

section.block {
  margin-top: 2.75rem;
}

section.block:first-of-type { margin-top: 1.5rem; }

h2.section-title {
  font-size: 1.05rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.5rem;
  margin: 0 0 1.1rem;
}

h3.subsection-title {
  font-family: var(--sans);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  margin: 1.6rem 0 0.6rem;
}

p.lead {
  font-size: 1.05rem;
  color: var(--ink);
}

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

ul.entry-list li {
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.97rem;
}

ul.entry-list li:last-child { border-bottom: none; }

ul.entry-list.compact li {
  padding: 0.4rem 0;
}

.entry-list .desc {
  display: block;
  margin-top: 0.25rem;
  color: var(--ink-soft);
  font-size: 0.92em;
}

.outlet-logo {
  width: 18px;
  height: 18px;
  object-fit: contain;
  vertical-align: -4px;
  margin-right: 0.45rem;
  border-radius: 3px;
  border: 1px solid var(--rule);
  background: #fff;
}

#grants .outlet-logo {
  width: 28px;
  height: 28px;
  vertical-align: -8px;
  margin-right: 0.6rem;
}

.entry-list .tag {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--bg-alt);
  border-radius: 3px;
  padding: 0.1rem 0.4rem;
  margin-left: 0.4rem;
}

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

.book-list li {
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--rule);
  display: flex;
  gap: 1rem;
  align-items: flex-start;
}

.book-list li:last-child { border-bottom: none; }

.book-list .book-cover {
  width: 52px;
  height: 52px;
  object-fit: cover;
  border: 1px solid var(--rule);
  flex-shrink: 0;
  border-radius: 2px;
}

.book-list .book-body { flex: 1; }

.book-list .book-title {
  font-style: italic;
  font-size: 1.02rem;
  display: block;
}

.book-list .book-meta {
  color: var(--ink-soft);
  font-size: 0.9rem;
}

/* ---------- Project grid ---------- */

:root {
  --cat-book: #9c7a29;
  --cat-software: #2f7a6f;
  --cat-digital: #3d6b8a;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: minmax(150px, auto);
  gap: 1.1rem;
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.project-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  text-decoration: none;
  color: var(--ink);
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.project-card.in-view {
  opacity: 1;
  transform: translateY(0);
}

.project-card .thumb-wrap {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow: hidden;
  background: var(--bg-alt);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.25s ease;
}

.project-card .thumb {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  background: var(--bg-alt);
  padding: 0.35rem;
  transition: filter 0.25s ease, transform 0.25s ease;
}

.project-card .cat-tags {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.3rem;
}

.project-card .cat-tag {
  font-family: var(--sans);
  font-size: 0.6rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: #fff;
  padding: 0.16rem 0.45rem;
  border-radius: 3px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.cat-tag--book { background: var(--cat-book); }
.cat-tag--software { background: var(--cat-software); }
.cat-tag--digital { background: var(--cat-digital); }

#upcoming .entry-list li {
  border-bottom: none;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.35rem 0;
}

#upcoming .date-tag {
  flex: 0 0 auto;
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #fff;
  background: var(--accent);
  padding: 0.22rem 0.5rem;
  border-radius: 3px;
  white-space: nowrap;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.project-card .overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 0.65rem;
  background: linear-gradient(to top, rgba(29, 53, 87, 0.92), rgba(29, 53, 87, 0.35) 60%, transparent);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.project-card .overlay-desc {
  font-family: var(--sans);
  font-size: 0.74rem;
  line-height: 1.35;
  color: #fff;
}

.project-card .overlay-year {
  display: block;
  margin-top: 0.3rem;
  font-family: var(--sans);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.75);
}

.project-card .label {
  display: block;
  margin-top: 0.5rem;
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--ink-soft);
  text-align: center;
  transition: color 0.2s ease;
}

.project-card:hover .thumb-wrap {
  border-color: var(--accent-soft);
  transform: perspective(700px) rotateX(2deg) rotateY(-2deg) translateY(-4px);
  box-shadow: 0 14px 26px rgba(29, 53, 87, 0.18);
}

.project-card:hover .thumb { filter: brightness(0.55); transform: scale(1.04); }
.project-card:hover .overlay { opacity: 1; }
.project-card:hover .label { color: var(--accent); }

@media (max-width: 640px) {
  .project-grid { grid-template-columns: repeat(2, 1fr); }
}

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

footer.site-footer {
  border-top: 1px solid var(--rule);
  background: var(--bg-alt);
  margin-top: 3rem;
}

footer.site-footer .wrap {
  padding: 2rem 1.5rem;
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

footer.site-footer a { color: var(--ink-soft); }

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

@media (max-width: 640px) {
  nav.primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--rule);
    flex-direction: column;
    gap: 0;
    display: none;
    padding: 0.5rem 1.5rem 1rem;
  }

  nav.primary-nav.open { display: flex; }

  nav.primary-nav a {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--rule);
  }

  .nav-toggle { display: inline-block; }

  .hero h1 { font-size: 1.7rem; }

  .hero {
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
  }

  .hero .hero-photo { width: 96px; height: 96px; }
}

.page-header .intro {
  color: var(--ink);
  font-size: 1.05rem;
  line-height: 1.65;
  margin-top: 0.75rem;
}

/* ---- Bio & Photo page ---- */
.bio-photo {
  display: flex;
  gap: 1.5rem;
  align-items: flex-start;
  flex-wrap: wrap;
}
.bio-photo img {
  width: 15rem;
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}
.download-list {
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1 1 14rem;
}
.download-list li { padding: 0.4rem 0; }
.download-list a { font-family: var(--sans); font-weight: 600; }
.meta {
  display: block;
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--ink-soft);
}
.section-title .meta { display: inline; font-weight: normal; }
.bio-text p { margin: 0 0 0.75rem; }
.copy-btn {
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--accent);
  background: var(--bg-alt);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 0.4rem 0.9rem;
  cursor: pointer;
}
.copy-btn:hover { border-color: var(--accent-soft); }
.bio-link { font-family: var(--sans); font-size: 0.95rem; margin-top: 1.25rem; }

/* ---- Logo icons for profile & social links ---- */
.social-links { display: flex; flex-wrap: wrap; align-items: center; gap: 0.85rem; }
.social-links .icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  margin: 0;
  text-decoration: none;
  transition: transform 0.15s ease, opacity 0.15s ease;
}
footer.site-footer .social-links { margin: 0.5rem 0; }
.social-links .icon-link:hover,
.social-links .icon-link:focus-visible { transform: translateY(-2px); opacity: 0.85; }
.social-links .icon { width: 100%; height: 100%; display: block; }
.social-links img.icon { border-radius: 3px; object-fit: contain; }
.social-links .icon-email, .social-links .icon-cv { color: var(--accent); }
.social-links .icon-scholar  { color: #4285f4; }
.social-links .icon-orcid    { color: #a6ce39; }
.social-links .icon-linkedin { color: #0a66c2; }
.social-links .icon-bluesky  { color: #1185fe; }
.social-links .icon-github   { color: #181717; }

/* ---- Folded older talks on the Talks page ---- */
details.earlier { margin-top: 0.75rem; }
details.earlier > summary {
  font-family: var(--sans);
  font-size: 0.9rem;
  color: var(--accent);
  cursor: pointer;
  padding: 0.4rem 0;
}
details.earlier > summary:hover { text-decoration: underline; }
details.earlier[open] > summary { margin-bottom: 0.25rem; }

/* ---- "Jump to" row and back-to-top button on long pages ---- */
section.block { scroll-margin-top: 5rem; }   /* keep headings clear of the sticky menu */
.jump-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  align-items: baseline;
  font-family: var(--sans);
  font-size: 0.85rem;
  margin: 0 0 1.5rem;
  padding: 0.6rem 0.8rem;
  background: var(--bg-alt);
  border-radius: 4px;
}
.jump-nav span {
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.72rem;
  margin-right: 0.25rem;
}
.jump-nav a {
  color: var(--accent);
  text-decoration: none;
  padding: 0.1rem 0.5rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--bg);
  white-space: nowrap;
}
.jump-nav a:hover, .jump-nav a:focus-visible { border-color: var(--accent-soft); }
.to-top {
  position: fixed;
  right: 1.25rem;
  bottom: calc(1.25rem + env(safe-area-inset-bottom, 0px));
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--accent);
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 0.4rem 0.8rem;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}
.to-top.visible { opacity: 1; pointer-events: auto; }